xref: /linux/drivers/scsi/ibmvscsi/ibmvfc.c (revision 88e45067a30918ebb4942120892963e2311330af)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
4  *
5  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
6  *
7  * Copyright (C) IBM Corporation, 2008
8  */
9 
10 #include <linux/module.h>
11 #include <linux/moduleparam.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/dmapool.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqdomain.h>
17 #include <linux/kthread.h>
18 #include <linux/slab.h>
19 #include <linux/of.h>
20 #include <linux/pm.h>
21 #include <linux/stringify.h>
22 #include <linux/bsg-lib.h>
23 #include <asm/firmware.h>
24 #include <asm/irq.h>
25 #include <asm/vio.h>
26 #include <scsi/scsi.h>
27 #include <scsi/scsi_cmnd.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_tcq.h>
31 #include <scsi/scsi_transport_fc.h>
32 #include <scsi/scsi_bsg_fc.h>
33 #include "ibmvfc.h"
34 
35 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
36 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
37 static u64 max_lun = IBMVFC_MAX_LUN;
38 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
39 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
40 static u16 max_sectors = IBMVFC_MAX_SECTORS;
41 static u16 scsi_qdepth = IBMVFC_SCSI_QDEPTH;
42 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
43 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
44 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
45 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
46 static unsigned int mq_enabled = IBMVFC_MQ;
47 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
48 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
49 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
50 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
51 
52 static LIST_HEAD(ibmvfc_head);
53 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
54 static struct scsi_transport_template *ibmvfc_transport_template;
55 
56 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
57 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
58 MODULE_LICENSE("GPL");
59 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
60 
61 module_param_named(mq, mq_enabled, uint, S_IRUGO);
62 MODULE_PARM_DESC(mq, "Enable multiqueue support. "
63 		 "[Default=" __stringify(IBMVFC_MQ) "]");
64 module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
65 MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
66 		 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
67 module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
68 MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
69 		 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
70 module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
71 MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
72 		 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
73 module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
74 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
75 		 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
76 
77 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
78 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
79 		 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
80 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
81 MODULE_PARM_DESC(default_timeout,
82 		 "Default timeout in seconds for initialization and EH commands. "
83 		 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
84 module_param_named(max_requests, max_requests, uint, S_IRUGO);
85 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
86 		 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
87 module_param_named(max_sectors, max_sectors, ushort, S_IRUGO);
88 MODULE_PARM_DESC(max_sectors, "Maximum sectors for this adapter. "
89 		 "[Default=" __stringify(IBMVFC_MAX_SECTORS) "]");
90 module_param_named(scsi_qdepth, scsi_qdepth, ushort, S_IRUGO);
91 MODULE_PARM_DESC(scsi_qdepth, "Maximum scsi command depth per adapter queue. "
92 		 "[Default=" __stringify(IBMVFC_SCSI_QDEPTH) "]");
93 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
94 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
95 		 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
96 module_param_named(max_targets, max_targets, uint, S_IRUGO);
97 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
98 		 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
99 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
100 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
101 		 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
102 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
103 MODULE_PARM_DESC(debug, "Enable driver debug information. "
104 		 "[Default=" __stringify(IBMVFC_DEBUG) "]");
105 module_param_named(log_level, log_level, uint, 0);
106 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
107 		 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
108 module_param_named(cls3_error, cls3_error, uint, 0);
109 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
110 		 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
111 
112 static const struct {
113 	u16 status;
114 	u16 error;
115 	u8 result;
116 	u8 retry;
117 	int log;
118 	char *name;
119 } cmd_status [] = {
120 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
121 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
122 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
123 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
124 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
125 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
126 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
127 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
128 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
129 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
130 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
131 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
132 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
133 	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
134 
135 	{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
136 	{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
137 	{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
138 	{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
139 	{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
140 	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
141 	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
142 	{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
143 	{ IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
144 	{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
145 
146 	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
147 	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
148 	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
149 	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
150 	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
151 	{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
152 	{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
153 	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
154 	{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
155 	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
156 	{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
157 
158 	{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
159 	{ IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
160 };
161 
162 static void ibmvfc_npiv_login(struct ibmvfc_host *);
163 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
164 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
165 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
166 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
167 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
168 static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
169 
170 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
171 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
172 
173 static const char *unknown_error = "unknown error";
174 
h_reg_sub_crq(unsigned long unit_address,unsigned long ioba,unsigned long length,unsigned long * cookie,unsigned long * irq)175 static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
176 			  unsigned long length, unsigned long *cookie,
177 			  unsigned long *irq)
178 {
179 	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
180 	long rc;
181 
182 	rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
183 	*cookie = retbuf[0];
184 	*irq = retbuf[1];
185 
186 	return rc;
187 }
188 
ibmvfc_check_caps(struct ibmvfc_host * vhost,unsigned long cap_flags)189 static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
190 {
191 	u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
192 
193 	return (host_caps & cap_flags) ? 1 : 0;
194 }
195 
ibmvfc_get_fcp_iu(struct ibmvfc_host * vhost,struct ibmvfc_cmd * vfc_cmd)196 static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
197 						   struct ibmvfc_cmd *vfc_cmd)
198 {
199 	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
200 		return &vfc_cmd->v2.iu;
201 	else
202 		return &vfc_cmd->v1.iu;
203 }
204 
ibmvfc_get_fcp_rsp(struct ibmvfc_host * vhost,struct ibmvfc_cmd * vfc_cmd)205 static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
206 						 struct ibmvfc_cmd *vfc_cmd)
207 {
208 	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
209 		return &vfc_cmd->v2.rsp;
210 	else
211 		return &vfc_cmd->v1.rsp;
212 }
213 
214 #ifdef CONFIG_SCSI_IBMVFC_TRACE
215 /**
216  * ibmvfc_trc_start - Log a start trace entry
217  * @evt:		ibmvfc event struct
218  *
219  **/
ibmvfc_trc_start(struct ibmvfc_event * evt)220 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
221 {
222 	struct ibmvfc_host *vhost = evt->vhost;
223 	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
224 	struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
225 	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
226 	struct ibmvfc_trace_entry *entry;
227 	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
228 
229 	entry = &vhost->trace[index];
230 	entry->evt = evt;
231 	entry->time = jiffies;
232 	entry->fmt = evt->crq.format;
233 	entry->type = IBMVFC_TRC_START;
234 
235 	switch (entry->fmt) {
236 	case IBMVFC_CMD_FORMAT:
237 		entry->op_code = iu->cdb[0];
238 		entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
239 		entry->lun = scsilun_to_int(&iu->lun);
240 		entry->tmf_flags = iu->tmf_flags;
241 		entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
242 		break;
243 	case IBMVFC_MAD_FORMAT:
244 		entry->op_code = be32_to_cpu(mad->opcode);
245 		break;
246 	default:
247 		break;
248 	}
249 }
250 
251 /**
252  * ibmvfc_trc_end - Log an end trace entry
253  * @evt:		ibmvfc event struct
254  *
255  **/
ibmvfc_trc_end(struct ibmvfc_event * evt)256 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
257 {
258 	struct ibmvfc_host *vhost = evt->vhost;
259 	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
260 	struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
261 	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
262 	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
263 	struct ibmvfc_trace_entry *entry;
264 	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
265 
266 	entry = &vhost->trace[index];
267 	entry->evt = evt;
268 	entry->time = jiffies;
269 	entry->fmt = evt->crq.format;
270 	entry->type = IBMVFC_TRC_END;
271 
272 	switch (entry->fmt) {
273 	case IBMVFC_CMD_FORMAT:
274 		entry->op_code = iu->cdb[0];
275 		entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
276 		entry->lun = scsilun_to_int(&iu->lun);
277 		entry->tmf_flags = iu->tmf_flags;
278 		entry->u.end.status = be16_to_cpu(vfc_cmd->status);
279 		entry->u.end.error = be16_to_cpu(vfc_cmd->error);
280 		entry->u.end.fcp_rsp_flags = rsp->flags;
281 		entry->u.end.rsp_code = rsp->data.info.rsp_code;
282 		entry->u.end.scsi_status = rsp->scsi_status;
283 		break;
284 	case IBMVFC_MAD_FORMAT:
285 		entry->op_code = be32_to_cpu(mad->opcode);
286 		entry->u.end.status = be16_to_cpu(mad->status);
287 		break;
288 	default:
289 		break;
290 
291 	}
292 }
293 
294 #else
295 #define ibmvfc_trc_start(evt) do { } while (0)
296 #define ibmvfc_trc_end(evt) do { } while (0)
297 #endif
298 
299 /**
300  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
301  * @status:		status / error class
302  * @error:		error
303  *
304  * Return value:
305  *	index into cmd_status / -EINVAL on failure
306  **/
ibmvfc_get_err_index(u16 status,u16 error)307 static int ibmvfc_get_err_index(u16 status, u16 error)
308 {
309 	int i;
310 
311 	for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
312 		if ((cmd_status[i].status & status) == cmd_status[i].status &&
313 		    cmd_status[i].error == error)
314 			return i;
315 
316 	return -EINVAL;
317 }
318 
319 /**
320  * ibmvfc_get_cmd_error - Find the error description for the fcp response
321  * @status:		status / error class
322  * @error:		error
323  *
324  * Return value:
325  *	error description string
326  **/
ibmvfc_get_cmd_error(u16 status,u16 error)327 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
328 {
329 	int rc = ibmvfc_get_err_index(status, error);
330 	if (rc >= 0)
331 		return cmd_status[rc].name;
332 	return unknown_error;
333 }
334 
335 /**
336  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
337  * @vhost:      ibmvfc host struct
338  * @vfc_cmd:	ibmvfc command struct
339  *
340  * Return value:
341  *	SCSI result value to return for completed command
342  **/
ibmvfc_get_err_result(struct ibmvfc_host * vhost,struct ibmvfc_cmd * vfc_cmd)343 static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
344 {
345 	int err;
346 	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
347 	int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
348 
349 	if ((rsp->flags & FCP_RSP_LEN_VALID) &&
350 	    ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
351 	     rsp->data.info.rsp_code))
352 		return DID_ERROR << 16;
353 
354 	err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
355 	if (err >= 0)
356 		return rsp->scsi_status | (cmd_status[err].result << 16);
357 	return rsp->scsi_status | (DID_ERROR << 16);
358 }
359 
360 /**
361  * ibmvfc_retry_cmd - Determine if error status is retryable
362  * @status:		status / error class
363  * @error:		error
364  *
365  * Return value:
366  *	1 if error should be retried / 0 if it should not
367  **/
ibmvfc_retry_cmd(u16 status,u16 error)368 static int ibmvfc_retry_cmd(u16 status, u16 error)
369 {
370 	int rc = ibmvfc_get_err_index(status, error);
371 
372 	if (rc >= 0)
373 		return cmd_status[rc].retry;
374 	return 1;
375 }
376 
377 static const char *unknown_fc_explain = "unknown fc explain";
378 
379 static const struct {
380 	u16 fc_explain;
381 	char *name;
382 } ls_explain [] = {
383 	{ 0x00, "no additional explanation" },
384 	{ 0x01, "service parameter error - options" },
385 	{ 0x03, "service parameter error - initiator control" },
386 	{ 0x05, "service parameter error - recipient control" },
387 	{ 0x07, "service parameter error - received data field size" },
388 	{ 0x09, "service parameter error - concurrent seq" },
389 	{ 0x0B, "service parameter error - credit" },
390 	{ 0x0D, "invalid N_Port/F_Port_Name" },
391 	{ 0x0E, "invalid node/Fabric Name" },
392 	{ 0x0F, "invalid common service parameters" },
393 	{ 0x11, "invalid association header" },
394 	{ 0x13, "association header required" },
395 	{ 0x15, "invalid originator S_ID" },
396 	{ 0x17, "invalid OX_ID-RX-ID combination" },
397 	{ 0x19, "command (request) already in progress" },
398 	{ 0x1E, "N_Port Login requested" },
399 	{ 0x1F, "Invalid N_Port_ID" },
400 };
401 
402 static const struct {
403 	u16 fc_explain;
404 	char *name;
405 } gs_explain [] = {
406 	{ 0x00, "no additional explanation" },
407 	{ 0x01, "port identifier not registered" },
408 	{ 0x02, "port name not registered" },
409 	{ 0x03, "node name not registered" },
410 	{ 0x04, "class of service not registered" },
411 	{ 0x06, "initial process associator not registered" },
412 	{ 0x07, "FC-4 TYPEs not registered" },
413 	{ 0x08, "symbolic port name not registered" },
414 	{ 0x09, "symbolic node name not registered" },
415 	{ 0x0A, "port type not registered" },
416 	{ 0xF0, "authorization exception" },
417 	{ 0xF1, "authentication exception" },
418 	{ 0xF2, "data base full" },
419 	{ 0xF3, "data base empty" },
420 	{ 0xF4, "processing request" },
421 	{ 0xF5, "unable to verify connection" },
422 	{ 0xF6, "devices not in a common zone" },
423 };
424 
425 /**
426  * ibmvfc_get_ls_explain - Return the FC Explain description text
427  * @status:	FC Explain status
428  *
429  * Returns:
430  *	error string
431  **/
ibmvfc_get_ls_explain(u16 status)432 static const char *ibmvfc_get_ls_explain(u16 status)
433 {
434 	int i;
435 
436 	for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
437 		if (ls_explain[i].fc_explain == status)
438 			return ls_explain[i].name;
439 
440 	return unknown_fc_explain;
441 }
442 
443 /**
444  * ibmvfc_get_gs_explain - Return the FC Explain description text
445  * @status:	FC Explain status
446  *
447  * Returns:
448  *	error string
449  **/
ibmvfc_get_gs_explain(u16 status)450 static const char *ibmvfc_get_gs_explain(u16 status)
451 {
452 	int i;
453 
454 	for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
455 		if (gs_explain[i].fc_explain == status)
456 			return gs_explain[i].name;
457 
458 	return unknown_fc_explain;
459 }
460 
461 static const struct {
462 	enum ibmvfc_fc_type fc_type;
463 	char *name;
464 } fc_type [] = {
465 	{ IBMVFC_FABRIC_REJECT, "fabric reject" },
466 	{ IBMVFC_PORT_REJECT, "port reject" },
467 	{ IBMVFC_LS_REJECT, "ELS reject" },
468 	{ IBMVFC_FABRIC_BUSY, "fabric busy" },
469 	{ IBMVFC_PORT_BUSY, "port busy" },
470 	{ IBMVFC_BASIC_REJECT, "basic reject" },
471 };
472 
473 static const char *unknown_fc_type = "unknown fc type";
474 
475 /**
476  * ibmvfc_get_fc_type - Return the FC Type description text
477  * @status:	FC Type error status
478  *
479  * Returns:
480  *	error string
481  **/
ibmvfc_get_fc_type(u16 status)482 static const char *ibmvfc_get_fc_type(u16 status)
483 {
484 	int i;
485 
486 	for (i = 0; i < ARRAY_SIZE(fc_type); i++)
487 		if (fc_type[i].fc_type == status)
488 			return fc_type[i].name;
489 
490 	return unknown_fc_type;
491 }
492 
493 /**
494  * ibmvfc_set_tgt_action - Set the next init action for the target
495  * @tgt:		ibmvfc target struct
496  * @action:		action to perform
497  *
498  * Returns:
499  *	0 if action changed / non-zero if not changed
500  **/
ibmvfc_set_tgt_action(struct ibmvfc_target * tgt,enum ibmvfc_target_action action)501 static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
502 				  enum ibmvfc_target_action action)
503 {
504 	int rc = -EINVAL;
505 
506 	switch (tgt->action) {
507 	case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
508 		if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
509 		    action == IBMVFC_TGT_ACTION_DEL_RPORT) {
510 			tgt->action = action;
511 			rc = 0;
512 		}
513 		break;
514 	case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
515 		if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
516 		    action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
517 			tgt->action = action;
518 			rc = 0;
519 		}
520 		break;
521 	case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
522 		if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
523 			tgt->action = action;
524 			rc = 0;
525 		}
526 		break;
527 	case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
528 		if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
529 			tgt->action = action;
530 			rc = 0;
531 		}
532 		break;
533 	case IBMVFC_TGT_ACTION_DEL_RPORT:
534 		if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
535 			tgt->action = action;
536 			rc = 0;
537 		}
538 		break;
539 	case IBMVFC_TGT_ACTION_DELETED_RPORT:
540 		break;
541 	default:
542 		tgt->action = action;
543 		rc = 0;
544 		break;
545 	}
546 
547 	if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
548 		tgt->add_rport = 0;
549 
550 	return rc;
551 }
552 
553 /**
554  * ibmvfc_set_host_state - Set the state for the host
555  * @vhost:		ibmvfc host struct
556  * @state:		state to set host to
557  *
558  * Returns:
559  *	0 if state changed / non-zero if not changed
560  **/
ibmvfc_set_host_state(struct ibmvfc_host * vhost,enum ibmvfc_host_state state)561 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
562 				  enum ibmvfc_host_state state)
563 {
564 	int rc = 0;
565 
566 	switch (vhost->state) {
567 	case IBMVFC_HOST_OFFLINE:
568 		rc = -EINVAL;
569 		break;
570 	default:
571 		vhost->state = state;
572 		break;
573 	}
574 
575 	return rc;
576 }
577 
578 /**
579  * ibmvfc_set_host_action - Set the next init action for the host
580  * @vhost:		ibmvfc host struct
581  * @action:		action to perform
582  *
583  **/
ibmvfc_set_host_action(struct ibmvfc_host * vhost,enum ibmvfc_host_action action)584 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
585 				   enum ibmvfc_host_action action)
586 {
587 	switch (action) {
588 	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
589 		if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
590 			vhost->action = action;
591 		break;
592 	case IBMVFC_HOST_ACTION_LOGO_WAIT:
593 		if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
594 			vhost->action = action;
595 		break;
596 	case IBMVFC_HOST_ACTION_INIT_WAIT:
597 		if (vhost->action == IBMVFC_HOST_ACTION_INIT)
598 			vhost->action = action;
599 		break;
600 	case IBMVFC_HOST_ACTION_QUERY:
601 		switch (vhost->action) {
602 		case IBMVFC_HOST_ACTION_INIT_WAIT:
603 		case IBMVFC_HOST_ACTION_NONE:
604 		case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
605 			vhost->action = action;
606 			break;
607 		default:
608 			break;
609 		}
610 		break;
611 	case IBMVFC_HOST_ACTION_TGT_INIT:
612 		if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
613 			vhost->action = action;
614 		break;
615 	case IBMVFC_HOST_ACTION_REENABLE:
616 	case IBMVFC_HOST_ACTION_RESET:
617 		vhost->action = action;
618 		break;
619 	case IBMVFC_HOST_ACTION_INIT:
620 	case IBMVFC_HOST_ACTION_TGT_DEL:
621 	case IBMVFC_HOST_ACTION_LOGO:
622 	case IBMVFC_HOST_ACTION_QUERY_TGTS:
623 	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
624 	case IBMVFC_HOST_ACTION_NONE:
625 	default:
626 		switch (vhost->action) {
627 		case IBMVFC_HOST_ACTION_RESET:
628 		case IBMVFC_HOST_ACTION_REENABLE:
629 			break;
630 		default:
631 			vhost->action = action;
632 			break;
633 		}
634 		break;
635 	}
636 }
637 
638 /**
639  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
640  * @vhost:		ibmvfc host struct
641  *
642  * Return value:
643  *	nothing
644  **/
ibmvfc_reinit_host(struct ibmvfc_host * vhost)645 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
646 {
647 	if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
648 	    vhost->state == IBMVFC_ACTIVE) {
649 		if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
650 			scsi_block_requests(vhost->host);
651 			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
652 		}
653 	} else
654 		vhost->reinit = 1;
655 
656 	wake_up(&vhost->work_wait_q);
657 }
658 
659 /**
660  * ibmvfc_del_tgt - Schedule cleanup and removal of the target
661  * @tgt:		ibmvfc target struct
662  **/
ibmvfc_del_tgt(struct ibmvfc_target * tgt)663 static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
664 {
665 	if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
666 		tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
667 		tgt->init_retries = 0;
668 	}
669 	wake_up(&tgt->vhost->work_wait_q);
670 }
671 
672 /**
673  * ibmvfc_link_down - Handle a link down event from the adapter
674  * @vhost:	ibmvfc host struct
675  * @state:	ibmvfc host state to enter
676  *
677  **/
ibmvfc_link_down(struct ibmvfc_host * vhost,enum ibmvfc_host_state state)678 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
679 			     enum ibmvfc_host_state state)
680 {
681 	struct ibmvfc_target *tgt;
682 
683 	ENTER;
684 	scsi_block_requests(vhost->host);
685 	list_for_each_entry(tgt, &vhost->targets, queue)
686 		ibmvfc_del_tgt(tgt);
687 	ibmvfc_set_host_state(vhost, state);
688 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
689 	vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
690 	wake_up(&vhost->work_wait_q);
691 	LEAVE;
692 }
693 
694 /**
695  * ibmvfc_init_host - Start host initialization
696  * @vhost:		ibmvfc host struct
697  *
698  * Return value:
699  *	nothing
700  **/
ibmvfc_init_host(struct ibmvfc_host * vhost)701 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
702 {
703 	struct ibmvfc_target *tgt;
704 
705 	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
706 		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
707 			dev_err(vhost->dev,
708 				"Host initialization retries exceeded. Taking adapter offline\n");
709 			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
710 			return;
711 		}
712 	}
713 
714 	if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
715 		memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
716 		vhost->async_crq.cur = 0;
717 
718 		list_for_each_entry(tgt, &vhost->targets, queue) {
719 			if (vhost->client_migrated)
720 				tgt->need_login = 1;
721 			else
722 				ibmvfc_del_tgt(tgt);
723 		}
724 
725 		scsi_block_requests(vhost->host);
726 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
727 		vhost->job_step = ibmvfc_npiv_login;
728 		wake_up(&vhost->work_wait_q);
729 	}
730 }
731 
732 /**
733  * ibmvfc_send_crq - Send a CRQ
734  * @vhost:	ibmvfc host struct
735  * @word1:	the first 64 bits of the data
736  * @word2:	the second 64 bits of the data
737  *
738  * Return value:
739  *	0 on success / other on failure
740  **/
ibmvfc_send_crq(struct ibmvfc_host * vhost,u64 word1,u64 word2)741 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
742 {
743 	struct vio_dev *vdev = to_vio_dev(vhost->dev);
744 	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
745 }
746 
ibmvfc_send_sub_crq(struct ibmvfc_host * vhost,u64 cookie,u64 word1,u64 word2,u64 word3,u64 word4)747 static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
748 			       u64 word2, u64 word3, u64 word4)
749 {
750 	struct vio_dev *vdev = to_vio_dev(vhost->dev);
751 
752 	return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
753 				  word1, word2, word3, word4);
754 }
755 
756 /**
757  * ibmvfc_send_crq_init - Send a CRQ init message
758  * @vhost:	ibmvfc host struct
759  *
760  * Return value:
761  *	0 on success / other on failure
762  **/
ibmvfc_send_crq_init(struct ibmvfc_host * vhost)763 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
764 {
765 	ibmvfc_dbg(vhost, "Sending CRQ init\n");
766 	return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
767 }
768 
769 /**
770  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
771  * @vhost:	ibmvfc host struct
772  *
773  * Return value:
774  *	0 on success / other on failure
775  **/
ibmvfc_send_crq_init_complete(struct ibmvfc_host * vhost)776 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
777 {
778 	ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
779 	return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
780 }
781 
782 /**
783  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
784  * @vhost:	ibmvfc host who owns the event pool
785  * @queue:      ibmvfc queue struct
786  *
787  * Returns zero on success.
788  **/
ibmvfc_init_event_pool(struct ibmvfc_host * vhost,struct ibmvfc_queue * queue)789 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
790 				  struct ibmvfc_queue *queue)
791 {
792 	int i;
793 	struct ibmvfc_event_pool *pool = &queue->evt_pool;
794 
795 	ENTER;
796 	if (!queue->total_depth)
797 		return 0;
798 
799 	pool->size = queue->total_depth;
800 	pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
801 	if (!pool->events)
802 		return -ENOMEM;
803 
804 	pool->iu_storage = dma_alloc_coherent(vhost->dev,
805 					      pool->size * sizeof(*pool->iu_storage),
806 					      &pool->iu_token, 0);
807 
808 	if (!pool->iu_storage) {
809 		kfree(pool->events);
810 		return -ENOMEM;
811 	}
812 
813 	INIT_LIST_HEAD(&queue->sent);
814 	INIT_LIST_HEAD(&queue->free);
815 	queue->evt_free = queue->evt_depth;
816 	queue->reserved_free = queue->reserved_depth;
817 	spin_lock_init(&queue->l_lock);
818 
819 	for (i = 0; i < pool->size; ++i) {
820 		struct ibmvfc_event *evt = &pool->events[i];
821 
822 		/*
823 		 * evt->active states
824 		 *  1 = in flight
825 		 *  0 = being completed
826 		 * -1 = free/freed
827 		 */
828 		atomic_set(&evt->active, -1);
829 		atomic_set(&evt->free, 1);
830 		evt->crq.valid = 0x80;
831 		evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
832 		evt->xfer_iu = pool->iu_storage + i;
833 		evt->vhost = vhost;
834 		evt->queue = queue;
835 		evt->ext_list = NULL;
836 		list_add_tail(&evt->queue_list, &queue->free);
837 	}
838 
839 	LEAVE;
840 	return 0;
841 }
842 
843 /**
844  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
845  * @vhost:	ibmvfc host who owns the event pool
846  * @queue:      ibmvfc queue struct
847  *
848  **/
ibmvfc_free_event_pool(struct ibmvfc_host * vhost,struct ibmvfc_queue * queue)849 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
850 				   struct ibmvfc_queue *queue)
851 {
852 	int i;
853 	struct ibmvfc_event_pool *pool = &queue->evt_pool;
854 
855 	ENTER;
856 	for (i = 0; i < pool->size; ++i) {
857 		list_del(&pool->events[i].queue_list);
858 		BUG_ON(atomic_read(&pool->events[i].free) != 1);
859 		if (pool->events[i].ext_list)
860 			dma_pool_free(vhost->sg_pool,
861 				      pool->events[i].ext_list,
862 				      pool->events[i].ext_list_token);
863 	}
864 
865 	kfree(pool->events);
866 	dma_free_coherent(vhost->dev,
867 			  pool->size * sizeof(*pool->iu_storage),
868 			  pool->iu_storage, pool->iu_token);
869 	LEAVE;
870 }
871 
872 /**
873  * ibmvfc_free_queue - Deallocate queue
874  * @vhost:	ibmvfc host struct
875  * @queue:	ibmvfc queue struct
876  *
877  * Unmaps dma and deallocates page for messages
878  **/
ibmvfc_free_queue(struct ibmvfc_host * vhost,struct ibmvfc_queue * queue)879 static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
880 			      struct ibmvfc_queue *queue)
881 {
882 	struct device *dev = vhost->dev;
883 
884 	dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
885 	free_page((unsigned long)queue->msgs.handle);
886 	queue->msgs.handle = NULL;
887 
888 	ibmvfc_free_event_pool(vhost, queue);
889 }
890 
891 /**
892  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
893  * @vhost:	ibmvfc host struct
894  *
895  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
896  * the crq with the hypervisor.
897  **/
ibmvfc_release_crq_queue(struct ibmvfc_host * vhost)898 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
899 {
900 	long rc = 0;
901 	struct vio_dev *vdev = to_vio_dev(vhost->dev);
902 	struct ibmvfc_queue *crq = &vhost->crq;
903 
904 	ibmvfc_dbg(vhost, "Releasing CRQ\n");
905 	free_irq(vdev->irq, vhost);
906 	tasklet_kill(&vhost->tasklet);
907 	do {
908 		if (rc)
909 			msleep(100);
910 		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
911 	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
912 
913 	vhost->state = IBMVFC_NO_CRQ;
914 	vhost->logged_in = 0;
915 
916 	ibmvfc_free_queue(vhost, crq);
917 }
918 
919 /**
920  * ibmvfc_reenable_crq_queue - reenables the CRQ
921  * @vhost:	ibmvfc host struct
922  *
923  * Return value:
924  *	0 on success / other on failure
925  **/
ibmvfc_reenable_crq_queue(struct ibmvfc_host * vhost)926 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
927 {
928 	int rc = 0;
929 	struct vio_dev *vdev = to_vio_dev(vhost->dev);
930 	unsigned long flags;
931 
932 	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
933 
934 	/* Re-enable the CRQ */
935 	do {
936 		if (rc)
937 			msleep(100);
938 		rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
939 	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
940 
941 	if (rc)
942 		dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
943 
944 	spin_lock_irqsave(vhost->host->host_lock, flags);
945 	spin_lock(vhost->crq.q_lock);
946 	vhost->do_enquiry = 1;
947 	vhost->using_channels = 0;
948 	spin_unlock(vhost->crq.q_lock);
949 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
950 
951 	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
952 
953 	return rc;
954 }
955 
956 /**
957  * ibmvfc_reset_crq - resets a crq after a failure
958  * @vhost:	ibmvfc host struct
959  *
960  * Return value:
961  *	0 on success / other on failure
962  **/
ibmvfc_reset_crq(struct ibmvfc_host * vhost)963 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
964 {
965 	int rc = 0;
966 	unsigned long flags;
967 	struct vio_dev *vdev = to_vio_dev(vhost->dev);
968 	struct ibmvfc_queue *crq = &vhost->crq;
969 
970 	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
971 
972 	/* Close the CRQ */
973 	do {
974 		if (rc)
975 			msleep(100);
976 		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
977 	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
978 
979 	spin_lock_irqsave(vhost->host->host_lock, flags);
980 	spin_lock(vhost->crq.q_lock);
981 	vhost->state = IBMVFC_NO_CRQ;
982 	vhost->logged_in = 0;
983 	vhost->do_enquiry = 1;
984 	vhost->using_channels = 0;
985 
986 	/* Clean out the queue */
987 	memset(crq->msgs.crq, 0, PAGE_SIZE);
988 	crq->cur = 0;
989 
990 	/* And re-open it again */
991 	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
992 				crq->msg_token, PAGE_SIZE);
993 
994 	if (rc == H_CLOSED)
995 		/* Adapter is good, but other end is not ready */
996 		dev_warn(vhost->dev, "Partner adapter not ready\n");
997 	else if (rc != 0)
998 		dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
999 
1000 	spin_unlock(vhost->crq.q_lock);
1001 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1002 
1003 	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
1004 
1005 	return rc;
1006 }
1007 
1008 /**
1009  * ibmvfc_valid_event - Determines if event is valid.
1010  * @pool:	event_pool that contains the event
1011  * @evt:	ibmvfc event to be checked for validity
1012  *
1013  * Return value:
1014  *	1 if event is valid / 0 if event is not valid
1015  **/
ibmvfc_valid_event(struct ibmvfc_event_pool * pool,struct ibmvfc_event * evt)1016 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1017 			      struct ibmvfc_event *evt)
1018 {
1019 	int index = evt - pool->events;
1020 	if (index < 0 || index >= pool->size)	/* outside of bounds */
1021 		return 0;
1022 	if (evt != pool->events + index)	/* unaligned */
1023 		return 0;
1024 	return 1;
1025 }
1026 
1027 /**
1028  * ibmvfc_free_event - Free the specified event
1029  * @evt:	ibmvfc_event to be freed
1030  *
1031  **/
ibmvfc_free_event(struct ibmvfc_event * evt)1032 static void ibmvfc_free_event(struct ibmvfc_event *evt)
1033 {
1034 	struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1035 	unsigned long flags;
1036 
1037 	BUG_ON(!ibmvfc_valid_event(pool, evt));
1038 	BUG_ON(atomic_inc_return(&evt->free) != 1);
1039 	BUG_ON(atomic_dec_and_test(&evt->active));
1040 
1041 	spin_lock_irqsave(&evt->queue->l_lock, flags);
1042 	list_add_tail(&evt->queue_list, &evt->queue->free);
1043 	if (evt->reserved) {
1044 		evt->reserved = 0;
1045 		evt->queue->reserved_free++;
1046 	} else {
1047 		evt->queue->evt_free++;
1048 	}
1049 	if (evt->eh_comp)
1050 		complete(evt->eh_comp);
1051 	spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1052 }
1053 
1054 /**
1055  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1056  * @evt:	ibmvfc event struct
1057  *
1058  * This function does not setup any error status, that must be done
1059  * before this function gets called.
1060  **/
ibmvfc_scsi_eh_done(struct ibmvfc_event * evt)1061 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1062 {
1063 	struct scsi_cmnd *cmnd = evt->cmnd;
1064 
1065 	if (cmnd) {
1066 		scsi_dma_unmap(cmnd);
1067 		scsi_done(cmnd);
1068 	}
1069 
1070 	ibmvfc_free_event(evt);
1071 }
1072 
1073 /**
1074  * ibmvfc_complete_purge - Complete failed command list
1075  * @purge_list:		list head of failed commands
1076  *
1077  * This function runs completions on commands to fail as a result of a
1078  * host reset or platform migration.
1079  **/
ibmvfc_complete_purge(struct list_head * purge_list)1080 static void ibmvfc_complete_purge(struct list_head *purge_list)
1081 {
1082 	struct ibmvfc_event *evt, *pos;
1083 
1084 	list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1085 		list_del(&evt->queue_list);
1086 		ibmvfc_trc_end(evt);
1087 		evt->done(evt);
1088 	}
1089 }
1090 
1091 /**
1092  * ibmvfc_fail_request - Fail request with specified error code
1093  * @evt:		ibmvfc event struct
1094  * @error_code:	error code to fail request with
1095  *
1096  * Return value:
1097  *	none
1098  **/
ibmvfc_fail_request(struct ibmvfc_event * evt,int error_code)1099 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1100 {
1101 	/*
1102 	 * Anything we are failing should still be active. Otherwise, it
1103 	 * implies we already got a response for the command and are doing
1104 	 * something bad like double completing it.
1105 	 */
1106 	BUG_ON(!atomic_dec_and_test(&evt->active));
1107 	if (evt->cmnd) {
1108 		evt->cmnd->result = (error_code << 16);
1109 		evt->done = ibmvfc_scsi_eh_done;
1110 	} else
1111 		evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1112 
1113 	del_timer(&evt->timer);
1114 }
1115 
1116 /**
1117  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1118  * @vhost:		ibmvfc host struct
1119  * @error_code:	error code to fail requests with
1120  *
1121  * Return value:
1122  *	none
1123  **/
ibmvfc_purge_requests(struct ibmvfc_host * vhost,int error_code)1124 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1125 {
1126 	struct ibmvfc_event *evt, *pos;
1127 	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1128 	unsigned long flags;
1129 	int hwqs = 0;
1130 	int i;
1131 
1132 	if (vhost->using_channels)
1133 		hwqs = vhost->scsi_scrqs.active_queues;
1134 
1135 	ibmvfc_dbg(vhost, "Purging all requests\n");
1136 	spin_lock_irqsave(&vhost->crq.l_lock, flags);
1137 	list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1138 		ibmvfc_fail_request(evt, error_code);
1139 	list_splice_init(&vhost->crq.sent, &vhost->purge);
1140 	spin_unlock_irqrestore(&vhost->crq.l_lock, flags);
1141 
1142 	for (i = 0; i < hwqs; i++) {
1143 		spin_lock_irqsave(queues[i].q_lock, flags);
1144 		spin_lock(&queues[i].l_lock);
1145 		list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1146 			ibmvfc_fail_request(evt, error_code);
1147 		list_splice_init(&queues[i].sent, &vhost->purge);
1148 		spin_unlock(&queues[i].l_lock);
1149 		spin_unlock_irqrestore(queues[i].q_lock, flags);
1150 	}
1151 }
1152 
1153 /**
1154  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1155  * @vhost:	struct ibmvfc host to reset
1156  **/
ibmvfc_hard_reset_host(struct ibmvfc_host * vhost)1157 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1158 {
1159 	ibmvfc_purge_requests(vhost, DID_ERROR);
1160 	ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
1161 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
1162 }
1163 
1164 /**
1165  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
1166  * @vhost:	struct ibmvfc host to reset
1167  **/
__ibmvfc_reset_host(struct ibmvfc_host * vhost)1168 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1169 {
1170 	if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1171 	    !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
1172 		scsi_block_requests(vhost->host);
1173 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
1174 		vhost->job_step = ibmvfc_npiv_logout;
1175 		wake_up(&vhost->work_wait_q);
1176 	} else
1177 		ibmvfc_hard_reset_host(vhost);
1178 }
1179 
1180 /**
1181  * ibmvfc_reset_host - Reset the connection to the server
1182  * @vhost:	ibmvfc host struct
1183  **/
ibmvfc_reset_host(struct ibmvfc_host * vhost)1184 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1185 {
1186 	unsigned long flags;
1187 
1188 	spin_lock_irqsave(vhost->host->host_lock, flags);
1189 	__ibmvfc_reset_host(vhost);
1190 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1191 }
1192 
1193 /**
1194  * ibmvfc_retry_host_init - Retry host initialization if allowed
1195  * @vhost:	ibmvfc host struct
1196  *
1197  * Returns: 1 if init will be retried / 0 if not
1198  *
1199  **/
ibmvfc_retry_host_init(struct ibmvfc_host * vhost)1200 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1201 {
1202 	int retry = 0;
1203 
1204 	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1205 		vhost->delay_init = 1;
1206 		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1207 			dev_err(vhost->dev,
1208 				"Host initialization retries exceeded. Taking adapter offline\n");
1209 			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
1210 		} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1211 			__ibmvfc_reset_host(vhost);
1212 		else {
1213 			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
1214 			retry = 1;
1215 		}
1216 	}
1217 
1218 	wake_up(&vhost->work_wait_q);
1219 	return retry;
1220 }
1221 
1222 /**
1223  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
1224  * @starget:	scsi target struct
1225  *
1226  * Return value:
1227  *	ibmvfc_target struct / NULL if not found
1228  **/
__ibmvfc_get_target(struct scsi_target * starget)1229 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1230 {
1231 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1232 	struct ibmvfc_host *vhost = shost_priv(shost);
1233 	struct ibmvfc_target *tgt;
1234 
1235 	list_for_each_entry(tgt, &vhost->targets, queue)
1236 		if (tgt->target_id == starget->id) {
1237 			kref_get(&tgt->kref);
1238 			return tgt;
1239 		}
1240 	return NULL;
1241 }
1242 
1243 /**
1244  * ibmvfc_get_target - Find the specified scsi_target
1245  * @starget:	scsi target struct
1246  *
1247  * Return value:
1248  *	ibmvfc_target struct / NULL if not found
1249  **/
ibmvfc_get_target(struct scsi_target * starget)1250 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1251 {
1252 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1253 	struct ibmvfc_target *tgt;
1254 	unsigned long flags;
1255 
1256 	spin_lock_irqsave(shost->host_lock, flags);
1257 	tgt = __ibmvfc_get_target(starget);
1258 	spin_unlock_irqrestore(shost->host_lock, flags);
1259 	return tgt;
1260 }
1261 
1262 /**
1263  * ibmvfc_get_host_speed - Get host port speed
1264  * @shost:		scsi host struct
1265  *
1266  * Return value:
1267  * 	none
1268  **/
ibmvfc_get_host_speed(struct Scsi_Host * shost)1269 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1270 {
1271 	struct ibmvfc_host *vhost = shost_priv(shost);
1272 	unsigned long flags;
1273 
1274 	spin_lock_irqsave(shost->host_lock, flags);
1275 	if (vhost->state == IBMVFC_ACTIVE) {
1276 		switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1277 		case 1:
1278 			fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1279 			break;
1280 		case 2:
1281 			fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1282 			break;
1283 		case 4:
1284 			fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1285 			break;
1286 		case 8:
1287 			fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1288 			break;
1289 		case 10:
1290 			fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1291 			break;
1292 		case 16:
1293 			fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1294 			break;
1295 		default:
1296 			ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1297 				   be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1298 			fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1299 			break;
1300 		}
1301 	} else
1302 		fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1303 	spin_unlock_irqrestore(shost->host_lock, flags);
1304 }
1305 
1306 /**
1307  * ibmvfc_get_host_port_state - Get host port state
1308  * @shost:		scsi host struct
1309  *
1310  * Return value:
1311  * 	none
1312  **/
ibmvfc_get_host_port_state(struct Scsi_Host * shost)1313 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1314 {
1315 	struct ibmvfc_host *vhost = shost_priv(shost);
1316 	unsigned long flags;
1317 
1318 	spin_lock_irqsave(shost->host_lock, flags);
1319 	switch (vhost->state) {
1320 	case IBMVFC_INITIALIZING:
1321 	case IBMVFC_ACTIVE:
1322 		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1323 		break;
1324 	case IBMVFC_LINK_DOWN:
1325 		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1326 		break;
1327 	case IBMVFC_LINK_DEAD:
1328 	case IBMVFC_HOST_OFFLINE:
1329 		fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1330 		break;
1331 	case IBMVFC_HALTED:
1332 		fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1333 		break;
1334 	case IBMVFC_NO_CRQ:
1335 		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1336 		break;
1337 	default:
1338 		ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1339 		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1340 		break;
1341 	}
1342 	spin_unlock_irqrestore(shost->host_lock, flags);
1343 }
1344 
1345 /**
1346  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1347  * @rport:		rport struct
1348  * @timeout:	timeout value
1349  *
1350  * Return value:
1351  * 	none
1352  **/
ibmvfc_set_rport_dev_loss_tmo(struct fc_rport * rport,u32 timeout)1353 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1354 {
1355 	if (timeout)
1356 		rport->dev_loss_tmo = timeout;
1357 	else
1358 		rport->dev_loss_tmo = 1;
1359 }
1360 
1361 /**
1362  * ibmvfc_release_tgt - Free memory allocated for a target
1363  * @kref:		kref struct
1364  *
1365  **/
ibmvfc_release_tgt(struct kref * kref)1366 static void ibmvfc_release_tgt(struct kref *kref)
1367 {
1368 	struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1369 	kfree(tgt);
1370 }
1371 
1372 /**
1373  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1374  * @starget:	scsi target struct
1375  *
1376  * Return value:
1377  * 	none
1378  **/
ibmvfc_get_starget_node_name(struct scsi_target * starget)1379 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1380 {
1381 	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1382 	fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1383 	if (tgt)
1384 		kref_put(&tgt->kref, ibmvfc_release_tgt);
1385 }
1386 
1387 /**
1388  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1389  * @starget:	scsi target struct
1390  *
1391  * Return value:
1392  * 	none
1393  **/
ibmvfc_get_starget_port_name(struct scsi_target * starget)1394 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1395 {
1396 	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1397 	fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1398 	if (tgt)
1399 		kref_put(&tgt->kref, ibmvfc_release_tgt);
1400 }
1401 
1402 /**
1403  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1404  * @starget:	scsi target struct
1405  *
1406  * Return value:
1407  * 	none
1408  **/
ibmvfc_get_starget_port_id(struct scsi_target * starget)1409 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1410 {
1411 	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1412 	fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1413 	if (tgt)
1414 		kref_put(&tgt->kref, ibmvfc_release_tgt);
1415 }
1416 
1417 /**
1418  * ibmvfc_wait_while_resetting - Wait while the host resets
1419  * @vhost:		ibmvfc host struct
1420  *
1421  * Return value:
1422  * 	0 on success / other on failure
1423  **/
ibmvfc_wait_while_resetting(struct ibmvfc_host * vhost)1424 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1425 {
1426 	long timeout = wait_event_timeout(vhost->init_wait_q,
1427 					  ((vhost->state == IBMVFC_ACTIVE ||
1428 					    vhost->state == IBMVFC_HOST_OFFLINE ||
1429 					    vhost->state == IBMVFC_LINK_DEAD) &&
1430 					   vhost->action == IBMVFC_HOST_ACTION_NONE),
1431 					  (init_timeout * HZ));
1432 
1433 	return timeout ? 0 : -EIO;
1434 }
1435 
1436 /**
1437  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1438  * @shost:		scsi host struct
1439  *
1440  * Return value:
1441  * 	0 on success / other on failure
1442  **/
ibmvfc_issue_fc_host_lip(struct Scsi_Host * shost)1443 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1444 {
1445 	struct ibmvfc_host *vhost = shost_priv(shost);
1446 
1447 	dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1448 	ibmvfc_reset_host(vhost);
1449 	return ibmvfc_wait_while_resetting(vhost);
1450 }
1451 
1452 /**
1453  * ibmvfc_gather_partition_info - Gather info about the LPAR
1454  * @vhost:      ibmvfc host struct
1455  *
1456  * Return value:
1457  *	none
1458  **/
ibmvfc_gather_partition_info(struct ibmvfc_host * vhost)1459 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1460 {
1461 	struct device_node *rootdn;
1462 	const char *name;
1463 	const unsigned int *num;
1464 
1465 	rootdn = of_find_node_by_path("/");
1466 	if (!rootdn)
1467 		return;
1468 
1469 	name = of_get_property(rootdn, "ibm,partition-name", NULL);
1470 	if (name)
1471 		strscpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1472 	num = of_get_property(rootdn, "ibm,partition-no", NULL);
1473 	if (num)
1474 		vhost->partition_number = *num;
1475 	of_node_put(rootdn);
1476 }
1477 
1478 /**
1479  * ibmvfc_set_login_info - Setup info for NPIV login
1480  * @vhost:	ibmvfc host struct
1481  *
1482  * Return value:
1483  *	none
1484  **/
ibmvfc_set_login_info(struct ibmvfc_host * vhost)1485 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1486 {
1487 	struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1488 	struct ibmvfc_queue *async_crq = &vhost->async_crq;
1489 	struct device_node *of_node = vhost->dev->of_node;
1490 	const char *location;
1491 	u16 max_cmds;
1492 
1493 	max_cmds = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
1494 	if (mq_enabled)
1495 		max_cmds += (scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ) *
1496 			vhost->scsi_scrqs.desired_queues;
1497 
1498 	memset(login_info, 0, sizeof(*login_info));
1499 
1500 	login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1501 	login_info->max_dma_len = cpu_to_be64(max_sectors << 9);
1502 	login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1503 	login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1504 	login_info->partition_num = cpu_to_be32(vhost->partition_number);
1505 	login_info->vfc_frame_version = cpu_to_be32(1);
1506 	login_info->fcp_version = cpu_to_be16(3);
1507 	login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1508 	if (vhost->client_migrated)
1509 		login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1510 
1511 	login_info->max_cmds = cpu_to_be32(max_cmds);
1512 	login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1513 
1514 	if (vhost->mq_enabled || vhost->using_channels)
1515 		login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1516 
1517 	login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1518 	login_info->async.len = cpu_to_be32(async_crq->size *
1519 					    sizeof(*async_crq->msgs.async));
1520 	strscpy(login_info->partition_name, vhost->partition_name,
1521 		sizeof(login_info->partition_name));
1522 
1523 	strscpy(login_info->device_name,
1524 		dev_name(&vhost->host->shost_gendev), sizeof(login_info->device_name));
1525 
1526 	location = of_get_property(of_node, "ibm,loc-code", NULL);
1527 	location = location ? location : dev_name(vhost->dev);
1528 	strscpy(login_info->drc_name, location, sizeof(login_info->drc_name));
1529 }
1530 
1531 /**
1532  * __ibmvfc_get_event - Gets the next free event in pool
1533  * @queue:      ibmvfc queue struct
1534  * @reserved:	event is for a reserved management command
1535  *
1536  * Returns a free event from the pool.
1537  **/
__ibmvfc_get_event(struct ibmvfc_queue * queue,int reserved)1538 static struct ibmvfc_event *__ibmvfc_get_event(struct ibmvfc_queue *queue, int reserved)
1539 {
1540 	struct ibmvfc_event *evt = NULL;
1541 	unsigned long flags;
1542 
1543 	spin_lock_irqsave(&queue->l_lock, flags);
1544 	if (reserved && queue->reserved_free) {
1545 		evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1546 		evt->reserved = 1;
1547 		queue->reserved_free--;
1548 	} else if (queue->evt_free) {
1549 		evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1550 		queue->evt_free--;
1551 	} else {
1552 		goto out;
1553 	}
1554 
1555 	atomic_set(&evt->free, 0);
1556 	list_del(&evt->queue_list);
1557 out:
1558 	spin_unlock_irqrestore(&queue->l_lock, flags);
1559 	return evt;
1560 }
1561 
1562 #define ibmvfc_get_event(queue) __ibmvfc_get_event(queue, 0)
1563 #define ibmvfc_get_reserved_event(queue) __ibmvfc_get_event(queue, 1)
1564 
1565 /**
1566  * ibmvfc_locked_done - Calls evt completion with host_lock held
1567  * @evt:	ibmvfc evt to complete
1568  *
1569  * All non-scsi command completion callbacks have the expectation that the
1570  * host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1571  * MAD evt with the host_lock.
1572  **/
ibmvfc_locked_done(struct ibmvfc_event * evt)1573 static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1574 {
1575 	unsigned long flags;
1576 
1577 	spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1578 	evt->_done(evt);
1579 	spin_unlock_irqrestore(evt->vhost->host->host_lock, flags);
1580 }
1581 
1582 /**
1583  * ibmvfc_init_event - Initialize fields in an event struct that are always
1584  *				required.
1585  * @evt:	The event
1586  * @done:	Routine to call when the event is responded to
1587  * @format:	SRP or MAD format
1588  **/
ibmvfc_init_event(struct ibmvfc_event * evt,void (* done)(struct ibmvfc_event *),u8 format)1589 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1590 			      void (*done) (struct ibmvfc_event *), u8 format)
1591 {
1592 	evt->cmnd = NULL;
1593 	evt->sync_iu = NULL;
1594 	evt->eh_comp = NULL;
1595 	evt->crq.format = format;
1596 	if (format == IBMVFC_CMD_FORMAT)
1597 		evt->done = done;
1598 	else {
1599 		evt->_done = done;
1600 		evt->done = ibmvfc_locked_done;
1601 	}
1602 	evt->hwq = 0;
1603 }
1604 
1605 /**
1606  * ibmvfc_map_sg_list - Initialize scatterlist
1607  * @scmd:	scsi command struct
1608  * @nseg:	number of scatterlist segments
1609  * @md:	memory descriptor list to initialize
1610  **/
ibmvfc_map_sg_list(struct scsi_cmnd * scmd,int nseg,struct srp_direct_buf * md)1611 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1612 			       struct srp_direct_buf *md)
1613 {
1614 	int i;
1615 	struct scatterlist *sg;
1616 
1617 	scsi_for_each_sg(scmd, sg, nseg, i) {
1618 		md[i].va = cpu_to_be64(sg_dma_address(sg));
1619 		md[i].len = cpu_to_be32(sg_dma_len(sg));
1620 		md[i].key = 0;
1621 	}
1622 }
1623 
1624 /**
1625  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1626  * @scmd:		struct scsi_cmnd with the scatterlist
1627  * @evt:		ibmvfc event struct
1628  * @vfc_cmd:	vfc_cmd that contains the memory descriptor
1629  * @dev:		device for which to map dma memory
1630  *
1631  * Returns:
1632  *	0 on success / non-zero on failure
1633  **/
ibmvfc_map_sg_data(struct scsi_cmnd * scmd,struct ibmvfc_event * evt,struct ibmvfc_cmd * vfc_cmd,struct device * dev)1634 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1635 			      struct ibmvfc_event *evt,
1636 			      struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1637 {
1638 
1639 	int sg_mapped;
1640 	struct srp_direct_buf *data = &vfc_cmd->ioba;
1641 	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1642 	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd);
1643 
1644 	if (cls3_error)
1645 		vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1646 
1647 	sg_mapped = scsi_dma_map(scmd);
1648 	if (!sg_mapped) {
1649 		vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1650 		return 0;
1651 	} else if (unlikely(sg_mapped < 0)) {
1652 		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1653 			scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1654 		return sg_mapped;
1655 	}
1656 
1657 	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1658 		vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1659 		iu->add_cdb_len |= IBMVFC_WRDATA;
1660 	} else {
1661 		vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1662 		iu->add_cdb_len |= IBMVFC_RDDATA;
1663 	}
1664 
1665 	if (sg_mapped == 1) {
1666 		ibmvfc_map_sg_list(scmd, sg_mapped, data);
1667 		return 0;
1668 	}
1669 
1670 	vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1671 
1672 	if (!evt->ext_list) {
1673 		evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1674 					       &evt->ext_list_token);
1675 
1676 		if (!evt->ext_list) {
1677 			scsi_dma_unmap(scmd);
1678 			if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1679 				scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1680 			return -ENOMEM;
1681 		}
1682 	}
1683 
1684 	ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1685 
1686 	data->va = cpu_to_be64(evt->ext_list_token);
1687 	data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1688 	data->key = 0;
1689 	return 0;
1690 }
1691 
1692 /**
1693  * ibmvfc_timeout - Internal command timeout handler
1694  * @t:	struct ibmvfc_event that timed out
1695  *
1696  * Called when an internally generated command times out
1697  **/
ibmvfc_timeout(struct timer_list * t)1698 static void ibmvfc_timeout(struct timer_list *t)
1699 {
1700 	struct ibmvfc_event *evt = from_timer(evt, t, timer);
1701 	struct ibmvfc_host *vhost = evt->vhost;
1702 	dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1703 	ibmvfc_reset_host(vhost);
1704 }
1705 
1706 /**
1707  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1708  * @evt:		event to be sent
1709  * @vhost:		ibmvfc host struct
1710  * @timeout:	timeout in seconds - 0 means do not time command
1711  *
1712  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1713  **/
ibmvfc_send_event(struct ibmvfc_event * evt,struct ibmvfc_host * vhost,unsigned long timeout)1714 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1715 			     struct ibmvfc_host *vhost, unsigned long timeout)
1716 {
1717 	__be64 *crq_as_u64 = (__be64 *) &evt->crq;
1718 	unsigned long flags;
1719 	int rc;
1720 
1721 	/* Copy the IU into the transfer area */
1722 	*evt->xfer_iu = evt->iu;
1723 	if (evt->crq.format == IBMVFC_CMD_FORMAT)
1724 		evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1725 	else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1726 		evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1727 	else
1728 		BUG();
1729 
1730 	timer_setup(&evt->timer, ibmvfc_timeout, 0);
1731 
1732 	if (timeout) {
1733 		evt->timer.expires = jiffies + (timeout * HZ);
1734 		add_timer(&evt->timer);
1735 	}
1736 
1737 	spin_lock_irqsave(&evt->queue->l_lock, flags);
1738 	list_add_tail(&evt->queue_list, &evt->queue->sent);
1739 	atomic_set(&evt->active, 1);
1740 
1741 	mb();
1742 
1743 	if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1744 		rc = ibmvfc_send_sub_crq(vhost,
1745 					 evt->queue->vios_cookie,
1746 					 be64_to_cpu(crq_as_u64[0]),
1747 					 be64_to_cpu(crq_as_u64[1]),
1748 					 0, 0);
1749 	else
1750 		rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1751 				     be64_to_cpu(crq_as_u64[1]));
1752 
1753 	if (rc) {
1754 		atomic_set(&evt->active, 0);
1755 		list_del(&evt->queue_list);
1756 		spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1757 		del_timer(&evt->timer);
1758 
1759 		/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1760 		 * Firmware will send a CRQ with a transport event (0xFF) to
1761 		 * tell this client what has happened to the transport. This
1762 		 * will be handled in ibmvfc_handle_crq()
1763 		 */
1764 		if (rc == H_CLOSED) {
1765 			if (printk_ratelimit())
1766 				dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1767 			if (evt->cmnd)
1768 				scsi_dma_unmap(evt->cmnd);
1769 			ibmvfc_free_event(evt);
1770 			return SCSI_MLQUEUE_HOST_BUSY;
1771 		}
1772 
1773 		dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1774 		if (evt->cmnd) {
1775 			evt->cmnd->result = DID_ERROR << 16;
1776 			evt->done = ibmvfc_scsi_eh_done;
1777 		} else
1778 			evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1779 
1780 		evt->done(evt);
1781 	} else {
1782 		spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1783 		ibmvfc_trc_start(evt);
1784 	}
1785 
1786 	return 0;
1787 }
1788 
1789 /**
1790  * ibmvfc_log_error - Log an error for the failed command if appropriate
1791  * @evt:	ibmvfc event to log
1792  *
1793  **/
ibmvfc_log_error(struct ibmvfc_event * evt)1794 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1795 {
1796 	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1797 	struct ibmvfc_host *vhost = evt->vhost;
1798 	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1799 	struct scsi_cmnd *cmnd = evt->cmnd;
1800 	const char *err = unknown_error;
1801 	int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1802 	int logerr = 0;
1803 	int rsp_code = 0;
1804 
1805 	if (index >= 0) {
1806 		logerr = cmd_status[index].log;
1807 		err = cmd_status[index].name;
1808 	}
1809 
1810 	if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1811 		return;
1812 
1813 	if (rsp->flags & FCP_RSP_LEN_VALID)
1814 		rsp_code = rsp->data.info.rsp_code;
1815 
1816 	scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1817 		    "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1818 		    cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1819 		    rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1820 }
1821 
1822 /**
1823  * ibmvfc_relogin - Log back into the specified device
1824  * @sdev:	scsi device struct
1825  *
1826  **/
ibmvfc_relogin(struct scsi_device * sdev)1827 static void ibmvfc_relogin(struct scsi_device *sdev)
1828 {
1829 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
1830 	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1831 	struct ibmvfc_target *tgt;
1832 	unsigned long flags;
1833 
1834 	spin_lock_irqsave(vhost->host->host_lock, flags);
1835 	list_for_each_entry(tgt, &vhost->targets, queue) {
1836 		if (rport == tgt->rport) {
1837 			ibmvfc_del_tgt(tgt);
1838 			break;
1839 		}
1840 	}
1841 
1842 	ibmvfc_reinit_host(vhost);
1843 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1844 }
1845 
1846 /**
1847  * ibmvfc_scsi_done - Handle responses from commands
1848  * @evt:	ibmvfc event to be handled
1849  *
1850  * Used as a callback when sending scsi cmds.
1851  **/
ibmvfc_scsi_done(struct ibmvfc_event * evt)1852 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1853 {
1854 	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1855 	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd);
1856 	struct scsi_cmnd *cmnd = evt->cmnd;
1857 	u32 rsp_len = 0;
1858 	u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1859 
1860 	if (cmnd) {
1861 		if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1862 			scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1863 		else if (rsp->flags & FCP_RESID_UNDER)
1864 			scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1865 		else
1866 			scsi_set_resid(cmnd, 0);
1867 
1868 		if (vfc_cmd->status) {
1869 			cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd);
1870 
1871 			if (rsp->flags & FCP_RSP_LEN_VALID)
1872 				rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1873 			if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1874 				sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1875 			if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1876 				memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1877 			if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1878 			    (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1879 				ibmvfc_relogin(cmnd->device);
1880 
1881 			if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1882 				cmnd->result = (DID_ERROR << 16);
1883 
1884 			ibmvfc_log_error(evt);
1885 		}
1886 
1887 		if (!cmnd->result &&
1888 		    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1889 			cmnd->result = (DID_ERROR << 16);
1890 
1891 		scsi_dma_unmap(cmnd);
1892 		scsi_done(cmnd);
1893 	}
1894 
1895 	ibmvfc_free_event(evt);
1896 }
1897 
1898 /**
1899  * ibmvfc_host_chkready - Check if the host can accept commands
1900  * @vhost:	 struct ibmvfc host
1901  *
1902  * Returns:
1903  *	1 if host can accept command / 0 if not
1904  **/
ibmvfc_host_chkready(struct ibmvfc_host * vhost)1905 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1906 {
1907 	int result = 0;
1908 
1909 	switch (vhost->state) {
1910 	case IBMVFC_LINK_DEAD:
1911 	case IBMVFC_HOST_OFFLINE:
1912 		result = DID_NO_CONNECT << 16;
1913 		break;
1914 	case IBMVFC_NO_CRQ:
1915 	case IBMVFC_INITIALIZING:
1916 	case IBMVFC_HALTED:
1917 	case IBMVFC_LINK_DOWN:
1918 		result = DID_REQUEUE << 16;
1919 		break;
1920 	case IBMVFC_ACTIVE:
1921 		result = 0;
1922 		break;
1923 	}
1924 
1925 	return result;
1926 }
1927 
ibmvfc_init_vfc_cmd(struct ibmvfc_event * evt,struct scsi_device * sdev)1928 static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1929 {
1930 	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1931 	struct ibmvfc_host *vhost = evt->vhost;
1932 	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1933 	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1934 	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1935 	size_t offset;
1936 
1937 	memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1938 	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1939 		offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1940 		vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1941 	} else
1942 		offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1943 	vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1944 	vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1945 	vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1946 	vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1947 	vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1948 	vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1949 	vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1950 	int_to_scsilun(sdev->lun, &iu->lun);
1951 
1952 	return vfc_cmd;
1953 }
1954 
1955 /**
1956  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1957  * @shost:	scsi host struct
1958  * @cmnd:	struct scsi_cmnd to be executed
1959  *
1960  * Returns:
1961  *	0 on success / other on failure
1962  **/
ibmvfc_queuecommand(struct Scsi_Host * shost,struct scsi_cmnd * cmnd)1963 static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
1964 {
1965 	struct ibmvfc_host *vhost = shost_priv(shost);
1966 	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1967 	struct ibmvfc_cmd *vfc_cmd;
1968 	struct ibmvfc_fcp_cmd_iu *iu;
1969 	struct ibmvfc_event *evt;
1970 	u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
1971 	u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1972 	u16 scsi_channel;
1973 	int rc;
1974 
1975 	if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1976 	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1977 		cmnd->result = rc;
1978 		scsi_done(cmnd);
1979 		return 0;
1980 	}
1981 
1982 	cmnd->result = (DID_OK << 16);
1983 	if (vhost->using_channels) {
1984 		scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1985 		evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1986 		if (!evt)
1987 			return SCSI_MLQUEUE_HOST_BUSY;
1988 
1989 		evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1990 	} else {
1991 		evt = ibmvfc_get_event(&vhost->crq);
1992 		if (!evt)
1993 			return SCSI_MLQUEUE_HOST_BUSY;
1994 	}
1995 
1996 	ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1997 	evt->cmnd = cmnd;
1998 
1999 	vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
2000 	iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
2001 
2002 	iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
2003 	memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
2004 
2005 	if (cmnd->flags & SCMD_TAGGED) {
2006 		vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
2007 		iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
2008 	}
2009 
2010 	vfc_cmd->correlation = cpu_to_be64((u64)evt);
2011 
2012 	if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
2013 		return ibmvfc_send_event(evt, vhost, 0);
2014 
2015 	ibmvfc_free_event(evt);
2016 	if (rc == -ENOMEM)
2017 		return SCSI_MLQUEUE_HOST_BUSY;
2018 
2019 	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2020 		scmd_printk(KERN_ERR, cmnd,
2021 			    "Failed to map DMA buffer for command. rc=%d\n", rc);
2022 
2023 	cmnd->result = DID_ERROR << 16;
2024 	scsi_done(cmnd);
2025 	return 0;
2026 }
2027 
2028 /**
2029  * ibmvfc_sync_completion - Signal that a synchronous command has completed
2030  * @evt:	ibmvfc event struct
2031  *
2032  **/
ibmvfc_sync_completion(struct ibmvfc_event * evt)2033 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
2034 {
2035 	/* copy the response back */
2036 	if (evt->sync_iu)
2037 		*evt->sync_iu = *evt->xfer_iu;
2038 
2039 	complete(&evt->comp);
2040 }
2041 
2042 /**
2043  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
2044  * @evt:	struct ibmvfc_event
2045  *
2046  **/
ibmvfc_bsg_timeout_done(struct ibmvfc_event * evt)2047 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2048 {
2049 	struct ibmvfc_host *vhost = evt->vhost;
2050 
2051 	ibmvfc_free_event(evt);
2052 	vhost->aborting_passthru = 0;
2053 	dev_info(vhost->dev, "Passthru command cancelled\n");
2054 }
2055 
2056 /**
2057  * ibmvfc_bsg_timeout - Handle a BSG timeout
2058  * @job:	struct bsg_job that timed out
2059  *
2060  * Returns:
2061  *	0 on success / other on failure
2062  **/
ibmvfc_bsg_timeout(struct bsg_job * job)2063 static int ibmvfc_bsg_timeout(struct bsg_job *job)
2064 {
2065 	struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2066 	unsigned long port_id = (unsigned long)job->dd_data;
2067 	struct ibmvfc_event *evt;
2068 	struct ibmvfc_tmf *tmf;
2069 	unsigned long flags;
2070 	int rc;
2071 
2072 	ENTER;
2073 	spin_lock_irqsave(vhost->host->host_lock, flags);
2074 	if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2075 		__ibmvfc_reset_host(vhost);
2076 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2077 		return 0;
2078 	}
2079 
2080 	vhost->aborting_passthru = 1;
2081 	evt = ibmvfc_get_reserved_event(&vhost->crq);
2082 	if (!evt) {
2083 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2084 		return -ENOMEM;
2085 	}
2086 
2087 	ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2088 
2089 	tmf = &evt->iu.tmf;
2090 	memset(tmf, 0, sizeof(*tmf));
2091 	tmf->common.version = cpu_to_be32(1);
2092 	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2093 	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2094 	tmf->scsi_id = cpu_to_be64(port_id);
2095 	tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2096 	tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2097 	rc = ibmvfc_send_event(evt, vhost, default_timeout);
2098 
2099 	if (rc != 0) {
2100 		vhost->aborting_passthru = 0;
2101 		dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2102 		rc = -EIO;
2103 	} else
2104 		dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2105 			 port_id);
2106 
2107 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2108 
2109 	LEAVE;
2110 	return rc;
2111 }
2112 
2113 /**
2114  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2115  * @vhost:		struct ibmvfc_host to send command
2116  * @port_id:	port ID to send command
2117  *
2118  * Returns:
2119  *	0 on success / other on failure
2120  **/
ibmvfc_bsg_plogi(struct ibmvfc_host * vhost,unsigned int port_id)2121 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2122 {
2123 	struct ibmvfc_port_login *plogi;
2124 	struct ibmvfc_target *tgt;
2125 	struct ibmvfc_event *evt;
2126 	union ibmvfc_iu rsp_iu;
2127 	unsigned long flags;
2128 	int rc = 0, issue_login = 1;
2129 
2130 	ENTER;
2131 	spin_lock_irqsave(vhost->host->host_lock, flags);
2132 	list_for_each_entry(tgt, &vhost->targets, queue) {
2133 		if (tgt->scsi_id == port_id) {
2134 			issue_login = 0;
2135 			break;
2136 		}
2137 	}
2138 
2139 	if (!issue_login)
2140 		goto unlock_out;
2141 	if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2142 		goto unlock_out;
2143 
2144 	evt = ibmvfc_get_reserved_event(&vhost->crq);
2145 	if (!evt) {
2146 		rc = -ENOMEM;
2147 		goto unlock_out;
2148 	}
2149 	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2150 	plogi = &evt->iu.plogi;
2151 	memset(plogi, 0, sizeof(*plogi));
2152 	plogi->common.version = cpu_to_be32(1);
2153 	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2154 	plogi->common.length = cpu_to_be16(sizeof(*plogi));
2155 	plogi->scsi_id = cpu_to_be64(port_id);
2156 	evt->sync_iu = &rsp_iu;
2157 	init_completion(&evt->comp);
2158 
2159 	rc = ibmvfc_send_event(evt, vhost, default_timeout);
2160 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2161 
2162 	if (rc)
2163 		return -EIO;
2164 
2165 	wait_for_completion(&evt->comp);
2166 
2167 	if (rsp_iu.plogi.common.status)
2168 		rc = -EIO;
2169 
2170 	spin_lock_irqsave(vhost->host->host_lock, flags);
2171 	ibmvfc_free_event(evt);
2172 unlock_out:
2173 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2174 	LEAVE;
2175 	return rc;
2176 }
2177 
2178 /**
2179  * ibmvfc_bsg_request - Handle a BSG request
2180  * @job:	struct bsg_job to be executed
2181  *
2182  * Returns:
2183  *	0 on success / other on failure
2184  **/
ibmvfc_bsg_request(struct bsg_job * job)2185 static int ibmvfc_bsg_request(struct bsg_job *job)
2186 {
2187 	struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2188 	struct fc_rport *rport = fc_bsg_to_rport(job);
2189 	struct ibmvfc_passthru_mad *mad;
2190 	struct ibmvfc_event *evt;
2191 	union ibmvfc_iu rsp_iu;
2192 	unsigned long flags, port_id = -1;
2193 	struct fc_bsg_request *bsg_request = job->request;
2194 	struct fc_bsg_reply *bsg_reply = job->reply;
2195 	unsigned int code = bsg_request->msgcode;
2196 	int rc = 0, req_seg, rsp_seg, issue_login = 0;
2197 	u32 fc_flags, rsp_len;
2198 
2199 	ENTER;
2200 	bsg_reply->reply_payload_rcv_len = 0;
2201 	if (rport)
2202 		port_id = rport->port_id;
2203 
2204 	switch (code) {
2205 	case FC_BSG_HST_ELS_NOLOGIN:
2206 		port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2207 			(bsg_request->rqst_data.h_els.port_id[1] << 8) |
2208 			bsg_request->rqst_data.h_els.port_id[2];
2209 		fallthrough;
2210 	case FC_BSG_RPT_ELS:
2211 		fc_flags = IBMVFC_FC_ELS;
2212 		break;
2213 	case FC_BSG_HST_CT:
2214 		issue_login = 1;
2215 		port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2216 			(bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2217 			bsg_request->rqst_data.h_ct.port_id[2];
2218 		fallthrough;
2219 	case FC_BSG_RPT_CT:
2220 		fc_flags = IBMVFC_FC_CT_IU;
2221 		break;
2222 	default:
2223 		return -ENOTSUPP;
2224 	}
2225 
2226 	if (port_id == -1)
2227 		return -EINVAL;
2228 	if (!mutex_trylock(&vhost->passthru_mutex))
2229 		return -EBUSY;
2230 
2231 	job->dd_data = (void *)port_id;
2232 	req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2233 			     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2234 
2235 	if (!req_seg) {
2236 		mutex_unlock(&vhost->passthru_mutex);
2237 		return -ENOMEM;
2238 	}
2239 
2240 	rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2241 			     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2242 
2243 	if (!rsp_seg) {
2244 		dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2245 			     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2246 		mutex_unlock(&vhost->passthru_mutex);
2247 		return -ENOMEM;
2248 	}
2249 
2250 	if (req_seg > 1 || rsp_seg > 1) {
2251 		rc = -EINVAL;
2252 		goto out;
2253 	}
2254 
2255 	if (issue_login)
2256 		rc = ibmvfc_bsg_plogi(vhost, port_id);
2257 
2258 	spin_lock_irqsave(vhost->host->host_lock, flags);
2259 
2260 	if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2261 	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2262 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2263 		goto out;
2264 	}
2265 
2266 	evt = ibmvfc_get_reserved_event(&vhost->crq);
2267 	if (!evt) {
2268 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2269 		rc = -ENOMEM;
2270 		goto out;
2271 	}
2272 	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2273 	mad = &evt->iu.passthru;
2274 
2275 	memset(mad, 0, sizeof(*mad));
2276 	mad->common.version = cpu_to_be32(1);
2277 	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2278 	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2279 
2280 	mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2281 		offsetof(struct ibmvfc_passthru_mad, iu));
2282 	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2283 
2284 	mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2285 	mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2286 	mad->iu.flags = cpu_to_be32(fc_flags);
2287 	mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2288 
2289 	mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2290 	mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2291 	mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2292 	mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2293 	mad->iu.scsi_id = cpu_to_be64(port_id);
2294 	mad->iu.tag = cpu_to_be64((u64)evt);
2295 	rsp_len = be32_to_cpu(mad->iu.rsp.len);
2296 
2297 	evt->sync_iu = &rsp_iu;
2298 	init_completion(&evt->comp);
2299 	rc = ibmvfc_send_event(evt, vhost, 0);
2300 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2301 
2302 	if (rc) {
2303 		rc = -EIO;
2304 		goto out;
2305 	}
2306 
2307 	wait_for_completion(&evt->comp);
2308 
2309 	if (rsp_iu.passthru.common.status)
2310 		rc = -EIO;
2311 	else
2312 		bsg_reply->reply_payload_rcv_len = rsp_len;
2313 
2314 	spin_lock_irqsave(vhost->host->host_lock, flags);
2315 	ibmvfc_free_event(evt);
2316 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2317 	bsg_reply->result = rc;
2318 	bsg_job_done(job, bsg_reply->result,
2319 		       bsg_reply->reply_payload_rcv_len);
2320 	rc = 0;
2321 out:
2322 	dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2323 		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2324 	dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2325 		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2326 	mutex_unlock(&vhost->passthru_mutex);
2327 	LEAVE;
2328 	return rc;
2329 }
2330 
2331 /**
2332  * ibmvfc_reset_device - Reset the device with the specified reset type
2333  * @sdev:	scsi device to reset
2334  * @type:	reset type
2335  * @desc:	reset type description for log messages
2336  *
2337  * Returns:
2338  *	0 on success / other on failure
2339  **/
ibmvfc_reset_device(struct scsi_device * sdev,int type,char * desc)2340 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2341 {
2342 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2343 	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2344 	struct ibmvfc_cmd *tmf;
2345 	struct ibmvfc_event *evt = NULL;
2346 	union ibmvfc_iu rsp_iu;
2347 	struct ibmvfc_fcp_cmd_iu *iu;
2348 	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2349 	int rsp_rc = -EBUSY;
2350 	unsigned long flags;
2351 	int rsp_code = 0;
2352 
2353 	spin_lock_irqsave(vhost->host->host_lock, flags);
2354 	if (vhost->state == IBMVFC_ACTIVE) {
2355 		if (vhost->using_channels)
2356 			evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2357 		else
2358 			evt = ibmvfc_get_event(&vhost->crq);
2359 
2360 		if (!evt) {
2361 			spin_unlock_irqrestore(vhost->host->host_lock, flags);
2362 			return -ENOMEM;
2363 		}
2364 
2365 		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2366 		tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2367 		iu = ibmvfc_get_fcp_iu(vhost, tmf);
2368 
2369 		tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2370 		if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2371 			tmf->target_wwpn = cpu_to_be64(rport->port_name);
2372 		iu->tmf_flags = type;
2373 		evt->sync_iu = &rsp_iu;
2374 
2375 		init_completion(&evt->comp);
2376 		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2377 	}
2378 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2379 
2380 	if (rsp_rc != 0) {
2381 		sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2382 			    desc, rsp_rc);
2383 		return -EIO;
2384 	}
2385 
2386 	sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2387 	wait_for_completion(&evt->comp);
2388 
2389 	if (rsp_iu.cmd.status)
2390 		rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2391 
2392 	if (rsp_code) {
2393 		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2394 			rsp_code = fc_rsp->data.info.rsp_code;
2395 
2396 		sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2397 			    "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2398 			    ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2399 			    be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2400 			    fc_rsp->scsi_status);
2401 		rsp_rc = -EIO;
2402 	} else
2403 		sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2404 
2405 	spin_lock_irqsave(vhost->host->host_lock, flags);
2406 	ibmvfc_free_event(evt);
2407 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2408 	return rsp_rc;
2409 }
2410 
2411 /**
2412  * ibmvfc_match_rport - Match function for specified remote port
2413  * @evt:	ibmvfc event struct
2414  * @rport:	device to match
2415  *
2416  * Returns:
2417  *	1 if event matches rport / 0 if event does not match rport
2418  **/
ibmvfc_match_rport(struct ibmvfc_event * evt,void * rport)2419 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2420 {
2421 	struct fc_rport *cmd_rport;
2422 
2423 	if (evt->cmnd) {
2424 		cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2425 		if (cmd_rport == rport)
2426 			return 1;
2427 	}
2428 	return 0;
2429 }
2430 
2431 /**
2432  * ibmvfc_match_target - Match function for specified target
2433  * @evt:	ibmvfc event struct
2434  * @device:	device to match (starget)
2435  *
2436  * Returns:
2437  *	1 if event matches starget / 0 if event does not match starget
2438  **/
ibmvfc_match_target(struct ibmvfc_event * evt,void * device)2439 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2440 {
2441 	if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2442 		return 1;
2443 	return 0;
2444 }
2445 
2446 /**
2447  * ibmvfc_match_lun - Match function for specified LUN
2448  * @evt:	ibmvfc event struct
2449  * @device:	device to match (sdev)
2450  *
2451  * Returns:
2452  *	1 if event matches sdev / 0 if event does not match sdev
2453  **/
ibmvfc_match_lun(struct ibmvfc_event * evt,void * device)2454 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2455 {
2456 	if (evt->cmnd && evt->cmnd->device == device)
2457 		return 1;
2458 	return 0;
2459 }
2460 
2461 /**
2462  * ibmvfc_event_is_free - Check if event is free or not
2463  * @evt:	ibmvfc event struct
2464  *
2465  * Returns:
2466  *	true / false
2467  **/
ibmvfc_event_is_free(struct ibmvfc_event * evt)2468 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2469 {
2470 	struct ibmvfc_event *loop_evt;
2471 
2472 	list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2473 		if (loop_evt == evt)
2474 			return true;
2475 
2476 	return false;
2477 }
2478 
2479 /**
2480  * ibmvfc_wait_for_ops - Wait for ops to complete
2481  * @vhost:	ibmvfc host struct
2482  * @device:	device to match (starget or sdev)
2483  * @match:	match function
2484  *
2485  * Returns:
2486  *	SUCCESS / FAILED
2487  **/
ibmvfc_wait_for_ops(struct ibmvfc_host * vhost,void * device,int (* match)(struct ibmvfc_event *,void *))2488 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2489 			       int (*match) (struct ibmvfc_event *, void *))
2490 {
2491 	struct ibmvfc_event *evt;
2492 	DECLARE_COMPLETION_ONSTACK(comp);
2493 	int wait, i, q_index, q_size;
2494 	unsigned long flags;
2495 	signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2496 	struct ibmvfc_queue *queues;
2497 
2498 	ENTER;
2499 	if (vhost->mq_enabled && vhost->using_channels) {
2500 		queues = vhost->scsi_scrqs.scrqs;
2501 		q_size = vhost->scsi_scrqs.active_queues;
2502 	} else {
2503 		queues = &vhost->crq;
2504 		q_size = 1;
2505 	}
2506 
2507 	do {
2508 		wait = 0;
2509 		spin_lock_irqsave(vhost->host->host_lock, flags);
2510 		for (q_index = 0; q_index < q_size; q_index++) {
2511 			spin_lock(&queues[q_index].l_lock);
2512 			for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2513 				evt = &queues[q_index].evt_pool.events[i];
2514 				if (!ibmvfc_event_is_free(evt)) {
2515 					if (match(evt, device)) {
2516 						evt->eh_comp = &comp;
2517 						wait++;
2518 					}
2519 				}
2520 			}
2521 			spin_unlock(&queues[q_index].l_lock);
2522 		}
2523 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2524 
2525 		if (wait) {
2526 			timeout = wait_for_completion_timeout(&comp, timeout);
2527 
2528 			if (!timeout) {
2529 				wait = 0;
2530 				spin_lock_irqsave(vhost->host->host_lock, flags);
2531 				for (q_index = 0; q_index < q_size; q_index++) {
2532 					spin_lock(&queues[q_index].l_lock);
2533 					for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2534 						evt = &queues[q_index].evt_pool.events[i];
2535 						if (!ibmvfc_event_is_free(evt)) {
2536 							if (match(evt, device)) {
2537 								evt->eh_comp = NULL;
2538 								wait++;
2539 							}
2540 						}
2541 					}
2542 					spin_unlock(&queues[q_index].l_lock);
2543 				}
2544 				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2545 				if (wait)
2546 					dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2547 				LEAVE;
2548 				return wait ? FAILED : SUCCESS;
2549 			}
2550 		}
2551 	} while (wait);
2552 
2553 	LEAVE;
2554 	return SUCCESS;
2555 }
2556 
ibmvfc_init_tmf(struct ibmvfc_queue * queue,struct scsi_device * sdev,int type)2557 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2558 					    struct scsi_device *sdev,
2559 					    int type)
2560 {
2561 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2562 	struct scsi_target *starget = scsi_target(sdev);
2563 	struct fc_rport *rport = starget_to_rport(starget);
2564 	struct ibmvfc_event *evt;
2565 	struct ibmvfc_tmf *tmf;
2566 
2567 	evt = ibmvfc_get_reserved_event(queue);
2568 	if (!evt)
2569 		return NULL;
2570 	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2571 
2572 	tmf = &evt->iu.tmf;
2573 	memset(tmf, 0, sizeof(*tmf));
2574 	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2575 		tmf->common.version = cpu_to_be32(2);
2576 		tmf->target_wwpn = cpu_to_be64(rport->port_name);
2577 	} else {
2578 		tmf->common.version = cpu_to_be32(1);
2579 	}
2580 	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2581 	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2582 	tmf->scsi_id = cpu_to_be64(rport->port_id);
2583 	int_to_scsilun(sdev->lun, &tmf->lun);
2584 	if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2585 		type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2586 	if (vhost->state == IBMVFC_ACTIVE)
2587 		tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2588 	else
2589 		tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2590 	tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2591 	tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2592 
2593 	init_completion(&evt->comp);
2594 
2595 	return evt;
2596 }
2597 
ibmvfc_cancel_all_mq(struct scsi_device * sdev,int type)2598 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2599 {
2600 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2601 	struct ibmvfc_event *evt, *found_evt, *temp;
2602 	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2603 	unsigned long flags;
2604 	int num_hwq, i;
2605 	int fail = 0;
2606 	LIST_HEAD(cancelq);
2607 	u16 status;
2608 
2609 	ENTER;
2610 	spin_lock_irqsave(vhost->host->host_lock, flags);
2611 	num_hwq = vhost->scsi_scrqs.active_queues;
2612 	for (i = 0; i < num_hwq; i++) {
2613 		spin_lock(queues[i].q_lock);
2614 		spin_lock(&queues[i].l_lock);
2615 		found_evt = NULL;
2616 		list_for_each_entry(evt, &queues[i].sent, queue_list) {
2617 			if (evt->cmnd && evt->cmnd->device == sdev) {
2618 				found_evt = evt;
2619 				break;
2620 			}
2621 		}
2622 		spin_unlock(&queues[i].l_lock);
2623 
2624 		if (found_evt && vhost->logged_in) {
2625 			evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2626 			if (!evt) {
2627 				spin_unlock(queues[i].q_lock);
2628 				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2629 				return -ENOMEM;
2630 			}
2631 			evt->sync_iu = &queues[i].cancel_rsp;
2632 			ibmvfc_send_event(evt, vhost, default_timeout);
2633 			list_add_tail(&evt->cancel, &cancelq);
2634 		}
2635 
2636 		spin_unlock(queues[i].q_lock);
2637 	}
2638 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2639 
2640 	if (list_empty(&cancelq)) {
2641 		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2642 			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2643 		return 0;
2644 	}
2645 
2646 	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2647 
2648 	list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2649 		wait_for_completion(&evt->comp);
2650 		status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2651 		list_del(&evt->cancel);
2652 		ibmvfc_free_event(evt);
2653 
2654 		if (status != IBMVFC_MAD_SUCCESS) {
2655 			sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2656 			switch (status) {
2657 			case IBMVFC_MAD_DRIVER_FAILED:
2658 			case IBMVFC_MAD_CRQ_ERROR:
2659 			/* Host adapter most likely going through reset, return success to
2660 			 * the caller will wait for the command being cancelled to get returned
2661 			 */
2662 				break;
2663 			default:
2664 				fail = 1;
2665 				break;
2666 			}
2667 		}
2668 	}
2669 
2670 	if (fail)
2671 		return -EIO;
2672 
2673 	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2674 	LEAVE;
2675 	return 0;
2676 }
2677 
ibmvfc_cancel_all_sq(struct scsi_device * sdev,int type)2678 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2679 {
2680 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2681 	struct ibmvfc_event *evt, *found_evt;
2682 	union ibmvfc_iu rsp;
2683 	int rsp_rc = -EBUSY;
2684 	unsigned long flags;
2685 	u16 status;
2686 
2687 	ENTER;
2688 	found_evt = NULL;
2689 	spin_lock_irqsave(vhost->host->host_lock, flags);
2690 	spin_lock(&vhost->crq.l_lock);
2691 	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2692 		if (evt->cmnd && evt->cmnd->device == sdev) {
2693 			found_evt = evt;
2694 			break;
2695 		}
2696 	}
2697 	spin_unlock(&vhost->crq.l_lock);
2698 
2699 	if (!found_evt) {
2700 		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2701 			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2702 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2703 		return 0;
2704 	}
2705 
2706 	if (vhost->logged_in) {
2707 		evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
2708 		evt->sync_iu = &rsp;
2709 		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2710 	}
2711 
2712 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2713 
2714 	if (rsp_rc != 0) {
2715 		sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2716 		/* If failure is received, the host adapter is most likely going
2717 		 through reset, return success so the caller will wait for the command
2718 		 being cancelled to get returned */
2719 		return 0;
2720 	}
2721 
2722 	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2723 
2724 	wait_for_completion(&evt->comp);
2725 	status = be16_to_cpu(rsp.mad_common.status);
2726 	spin_lock_irqsave(vhost->host->host_lock, flags);
2727 	ibmvfc_free_event(evt);
2728 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2729 
2730 	if (status != IBMVFC_MAD_SUCCESS) {
2731 		sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2732 		switch (status) {
2733 		case IBMVFC_MAD_DRIVER_FAILED:
2734 		case IBMVFC_MAD_CRQ_ERROR:
2735 			/* Host adapter most likely going through reset, return success to
2736 			 the caller will wait for the command being cancelled to get returned */
2737 			return 0;
2738 		default:
2739 			return -EIO;
2740 		};
2741 	}
2742 
2743 	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2744 	return 0;
2745 }
2746 
2747 /**
2748  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2749  * @sdev:	scsi device to cancel commands
2750  * @type:	type of error recovery being performed
2751  *
2752  * This sends a cancel to the VIOS for the specified device. This does
2753  * NOT send any abort to the actual device. That must be done separately.
2754  *
2755  * Returns:
2756  *	0 on success / other on failure
2757  **/
ibmvfc_cancel_all(struct scsi_device * sdev,int type)2758 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2759 {
2760 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2761 
2762 	if (vhost->mq_enabled && vhost->using_channels)
2763 		return ibmvfc_cancel_all_mq(sdev, type);
2764 	else
2765 		return ibmvfc_cancel_all_sq(sdev, type);
2766 }
2767 
2768 /**
2769  * ibmvfc_match_key - Match function for specified cancel key
2770  * @evt:	ibmvfc event struct
2771  * @key:	cancel key to match
2772  *
2773  * Returns:
2774  *	1 if event matches key / 0 if event does not match key
2775  **/
ibmvfc_match_key(struct ibmvfc_event * evt,void * key)2776 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2777 {
2778 	unsigned long cancel_key = (unsigned long)key;
2779 
2780 	if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2781 	    be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2782 		return 1;
2783 	return 0;
2784 }
2785 
2786 /**
2787  * ibmvfc_match_evt - Match function for specified event
2788  * @evt:	ibmvfc event struct
2789  * @match:	event to match
2790  *
2791  * Returns:
2792  *	1 if event matches key / 0 if event does not match key
2793  **/
ibmvfc_match_evt(struct ibmvfc_event * evt,void * match)2794 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2795 {
2796 	if (evt == match)
2797 		return 1;
2798 	return 0;
2799 }
2800 
2801 /**
2802  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2803  * @sdev:	scsi device to abort commands
2804  *
2805  * This sends an Abort Task Set to the VIOS for the specified device. This does
2806  * NOT send any cancel to the VIOS. That must be done separately.
2807  *
2808  * Returns:
2809  *	0 on success / other on failure
2810  **/
ibmvfc_abort_task_set(struct scsi_device * sdev)2811 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2812 {
2813 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2814 	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2815 	struct ibmvfc_cmd *tmf;
2816 	struct ibmvfc_event *evt, *found_evt;
2817 	union ibmvfc_iu rsp_iu;
2818 	struct ibmvfc_fcp_cmd_iu *iu;
2819 	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2820 	int rc, rsp_rc = -EBUSY;
2821 	unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2822 	int rsp_code = 0;
2823 
2824 	found_evt = NULL;
2825 	spin_lock_irqsave(vhost->host->host_lock, flags);
2826 	spin_lock(&vhost->crq.l_lock);
2827 	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2828 		if (evt->cmnd && evt->cmnd->device == sdev) {
2829 			found_evt = evt;
2830 			break;
2831 		}
2832 	}
2833 	spin_unlock(&vhost->crq.l_lock);
2834 
2835 	if (!found_evt) {
2836 		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2837 			sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2838 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2839 		return 0;
2840 	}
2841 
2842 	if (vhost->state == IBMVFC_ACTIVE) {
2843 		evt = ibmvfc_get_event(&vhost->crq);
2844 		if (!evt) {
2845 			spin_unlock_irqrestore(vhost->host->host_lock, flags);
2846 			return -ENOMEM;
2847 		}
2848 		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2849 		tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2850 		iu = ibmvfc_get_fcp_iu(vhost, tmf);
2851 
2852 		if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2853 			tmf->target_wwpn = cpu_to_be64(rport->port_name);
2854 		iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2855 		tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2856 		evt->sync_iu = &rsp_iu;
2857 
2858 		tmf->correlation = cpu_to_be64((u64)evt);
2859 
2860 		init_completion(&evt->comp);
2861 		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2862 	}
2863 
2864 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2865 
2866 	if (rsp_rc != 0) {
2867 		sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2868 		return -EIO;
2869 	}
2870 
2871 	sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2872 	timeout = wait_for_completion_timeout(&evt->comp, timeout);
2873 
2874 	if (!timeout) {
2875 		rc = ibmvfc_cancel_all(sdev, 0);
2876 		if (!rc) {
2877 			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2878 			if (rc == SUCCESS)
2879 				rc = 0;
2880 		}
2881 
2882 		if (rc) {
2883 			sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2884 			ibmvfc_reset_host(vhost);
2885 			rsp_rc = -EIO;
2886 			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2887 
2888 			if (rc == SUCCESS)
2889 				rsp_rc = 0;
2890 
2891 			rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2892 			if (rc != SUCCESS) {
2893 				spin_lock_irqsave(vhost->host->host_lock, flags);
2894 				ibmvfc_hard_reset_host(vhost);
2895 				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2896 				rsp_rc = 0;
2897 			}
2898 
2899 			goto out;
2900 		}
2901 	}
2902 
2903 	if (rsp_iu.cmd.status)
2904 		rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2905 
2906 	if (rsp_code) {
2907 		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2908 			rsp_code = fc_rsp->data.info.rsp_code;
2909 
2910 		sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2911 			    "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2912 			    ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2913 			    be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2914 			    fc_rsp->scsi_status);
2915 		rsp_rc = -EIO;
2916 	} else
2917 		sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2918 
2919 out:
2920 	spin_lock_irqsave(vhost->host->host_lock, flags);
2921 	ibmvfc_free_event(evt);
2922 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2923 	return rsp_rc;
2924 }
2925 
2926 /**
2927  * ibmvfc_eh_abort_handler - Abort a command
2928  * @cmd:	scsi command to abort
2929  *
2930  * Returns:
2931  *	SUCCESS / FAST_IO_FAIL / FAILED
2932  **/
ibmvfc_eh_abort_handler(struct scsi_cmnd * cmd)2933 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2934 {
2935 	struct scsi_device *sdev = cmd->device;
2936 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2937 	int cancel_rc, block_rc;
2938 	int rc = FAILED;
2939 
2940 	ENTER;
2941 	block_rc = fc_block_scsi_eh(cmd);
2942 	ibmvfc_wait_while_resetting(vhost);
2943 	if (block_rc != FAST_IO_FAIL) {
2944 		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2945 		ibmvfc_abort_task_set(sdev);
2946 	} else
2947 		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2948 
2949 	if (!cancel_rc)
2950 		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2951 
2952 	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2953 		rc = FAST_IO_FAIL;
2954 
2955 	LEAVE;
2956 	return rc;
2957 }
2958 
2959 /**
2960  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2961  * @cmd:	scsi command struct
2962  *
2963  * Returns:
2964  *	SUCCESS / FAST_IO_FAIL / FAILED
2965  **/
ibmvfc_eh_device_reset_handler(struct scsi_cmnd * cmd)2966 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2967 {
2968 	struct scsi_device *sdev = cmd->device;
2969 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2970 	int cancel_rc, block_rc, reset_rc = 0;
2971 	int rc = FAILED;
2972 
2973 	ENTER;
2974 	block_rc = fc_block_scsi_eh(cmd);
2975 	ibmvfc_wait_while_resetting(vhost);
2976 	if (block_rc != FAST_IO_FAIL) {
2977 		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2978 		reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2979 	} else
2980 		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2981 
2982 	if (!cancel_rc && !reset_rc)
2983 		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2984 
2985 	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2986 		rc = FAST_IO_FAIL;
2987 
2988 	LEAVE;
2989 	return rc;
2990 }
2991 
2992 /**
2993  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2994  * @sdev:	scsi device struct
2995  * @data:	return code
2996  *
2997  **/
ibmvfc_dev_cancel_all_noreset(struct scsi_device * sdev,void * data)2998 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2999 {
3000 	unsigned long *rc = data;
3001 	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3002 }
3003 
3004 /**
3005  * ibmvfc_eh_target_reset_handler - Reset the target
3006  * @cmd:	scsi command struct
3007  *
3008  * Returns:
3009  *	SUCCESS / FAST_IO_FAIL / FAILED
3010  **/
ibmvfc_eh_target_reset_handler(struct scsi_cmnd * cmd)3011 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
3012 {
3013 	struct scsi_target *starget = scsi_target(cmd->device);
3014 	struct fc_rport *rport = starget_to_rport(starget);
3015 	struct Scsi_Host *shost = rport_to_shost(rport);
3016 	struct ibmvfc_host *vhost = shost_priv(shost);
3017 	int block_rc;
3018 	int reset_rc = 0;
3019 	int rc = FAILED;
3020 	unsigned long cancel_rc = 0;
3021 	bool tgt_reset = false;
3022 
3023 	ENTER;
3024 	block_rc = fc_block_rport(rport);
3025 	ibmvfc_wait_while_resetting(vhost);
3026 	if (block_rc != FAST_IO_FAIL) {
3027 		struct scsi_device *sdev;
3028 
3029 		shost_for_each_device(sdev, shost) {
3030 			if ((sdev->channel != starget->channel) ||
3031 			    (sdev->id != starget->id))
3032 				continue;
3033 
3034 			cancel_rc |= ibmvfc_cancel_all(sdev,
3035 						       IBMVFC_TMF_TGT_RESET);
3036 			if (!tgt_reset) {
3037 				reset_rc = ibmvfc_reset_device(sdev,
3038 					IBMVFC_TARGET_RESET, "target");
3039 				tgt_reset = true;
3040 			}
3041 		}
3042 	} else
3043 		starget_for_each_device(starget, &cancel_rc,
3044 					ibmvfc_dev_cancel_all_noreset);
3045 
3046 	if (!cancel_rc && !reset_rc)
3047 		rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
3048 
3049 	if (block_rc == FAST_IO_FAIL && rc != FAILED)
3050 		rc = FAST_IO_FAIL;
3051 
3052 	LEAVE;
3053 	return rc;
3054 }
3055 
3056 /**
3057  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
3058  * @cmd:	struct scsi_cmnd having problems
3059  *
3060  **/
ibmvfc_eh_host_reset_handler(struct scsi_cmnd * cmd)3061 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
3062 {
3063 	int rc;
3064 	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
3065 
3066 	dev_err(vhost->dev, "Resetting connection due to error recovery\n");
3067 	rc = ibmvfc_issue_fc_host_lip(vhost->host);
3068 
3069 	return rc ? FAILED : SUCCESS;
3070 }
3071 
3072 /**
3073  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
3074  * @rport:		rport struct
3075  *
3076  * Return value:
3077  * 	none
3078  **/
ibmvfc_terminate_rport_io(struct fc_rport * rport)3079 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3080 {
3081 	struct Scsi_Host *shost = rport_to_shost(rport);
3082 	struct ibmvfc_host *vhost = shost_priv(shost);
3083 	struct fc_rport *dev_rport;
3084 	struct scsi_device *sdev;
3085 	struct ibmvfc_target *tgt;
3086 	unsigned long rc, flags;
3087 	unsigned int found;
3088 
3089 	ENTER;
3090 	shost_for_each_device(sdev, shost) {
3091 		dev_rport = starget_to_rport(scsi_target(sdev));
3092 		if (dev_rport != rport)
3093 			continue;
3094 		ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3095 	}
3096 
3097 	rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3098 
3099 	if (rc == FAILED)
3100 		ibmvfc_issue_fc_host_lip(shost);
3101 
3102 	spin_lock_irqsave(shost->host_lock, flags);
3103 	found = 0;
3104 	list_for_each_entry(tgt, &vhost->targets, queue) {
3105 		if (tgt->scsi_id == rport->port_id) {
3106 			found++;
3107 			break;
3108 		}
3109 	}
3110 
3111 	if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3112 		/*
3113 		 * If we get here, that means we previously attempted to send
3114 		 * an implicit logout to the target but it failed, most likely
3115 		 * due to I/O being pending, so we need to send it again
3116 		 */
3117 		ibmvfc_del_tgt(tgt);
3118 		ibmvfc_reinit_host(vhost);
3119 	}
3120 
3121 	spin_unlock_irqrestore(shost->host_lock, flags);
3122 	LEAVE;
3123 }
3124 
3125 static const struct ibmvfc_async_desc ae_desc [] = {
3126 	{ "PLOGI",	IBMVFC_AE_ELS_PLOGI,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3127 	{ "LOGO",	IBMVFC_AE_ELS_LOGO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3128 	{ "PRLO",	IBMVFC_AE_ELS_PRLO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3129 	{ "N-Port SCN",	IBMVFC_AE_SCN_NPORT,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3130 	{ "Group SCN",	IBMVFC_AE_SCN_GROUP,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3131 	{ "Domain SCN",	IBMVFC_AE_SCN_DOMAIN,	IBMVFC_DEFAULT_LOG_LEVEL },
3132 	{ "Fabric SCN",	IBMVFC_AE_SCN_FABRIC,	IBMVFC_DEFAULT_LOG_LEVEL },
3133 	{ "Link Up",	IBMVFC_AE_LINK_UP,	IBMVFC_DEFAULT_LOG_LEVEL },
3134 	{ "Link Down",	IBMVFC_AE_LINK_DOWN,	IBMVFC_DEFAULT_LOG_LEVEL },
3135 	{ "Link Dead",	IBMVFC_AE_LINK_DEAD,	IBMVFC_DEFAULT_LOG_LEVEL },
3136 	{ "Halt",	IBMVFC_AE_HALT,		IBMVFC_DEFAULT_LOG_LEVEL },
3137 	{ "Resume",	IBMVFC_AE_RESUME,	IBMVFC_DEFAULT_LOG_LEVEL },
3138 	{ "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3139 };
3140 
3141 static const struct ibmvfc_async_desc unknown_ae = {
3142 	"Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3143 };
3144 
3145 /**
3146  * ibmvfc_get_ae_desc - Get text description for async event
3147  * @ae:	async event
3148  *
3149  **/
ibmvfc_get_ae_desc(u64 ae)3150 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3151 {
3152 	int i;
3153 
3154 	for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3155 		if (ae_desc[i].ae == ae)
3156 			return &ae_desc[i];
3157 
3158 	return &unknown_ae;
3159 }
3160 
3161 static const struct {
3162 	enum ibmvfc_ae_link_state state;
3163 	const char *desc;
3164 } link_desc [] = {
3165 	{ IBMVFC_AE_LS_LINK_UP,		" link up" },
3166 	{ IBMVFC_AE_LS_LINK_BOUNCED,	" link bounced" },
3167 	{ IBMVFC_AE_LS_LINK_DOWN,	" link down" },
3168 	{ IBMVFC_AE_LS_LINK_DEAD,	" link dead" },
3169 };
3170 
3171 /**
3172  * ibmvfc_get_link_state - Get text description for link state
3173  * @state:	link state
3174  *
3175  **/
ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)3176 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3177 {
3178 	int i;
3179 
3180 	for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3181 		if (link_desc[i].state == state)
3182 			return link_desc[i].desc;
3183 
3184 	return "";
3185 }
3186 
3187 /**
3188  * ibmvfc_handle_async - Handle an async event from the adapter
3189  * @crq:	crq to process
3190  * @vhost:	ibmvfc host struct
3191  *
3192  **/
ibmvfc_handle_async(struct ibmvfc_async_crq * crq,struct ibmvfc_host * vhost)3193 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3194 				struct ibmvfc_host *vhost)
3195 {
3196 	const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3197 	struct ibmvfc_target *tgt;
3198 
3199 	ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3200 		   " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3201 		   be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3202 		   ibmvfc_get_link_state(crq->link_state));
3203 
3204 	switch (be64_to_cpu(crq->event)) {
3205 	case IBMVFC_AE_RESUME:
3206 		switch (crq->link_state) {
3207 		case IBMVFC_AE_LS_LINK_DOWN:
3208 			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3209 			break;
3210 		case IBMVFC_AE_LS_LINK_DEAD:
3211 			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3212 			break;
3213 		case IBMVFC_AE_LS_LINK_UP:
3214 		case IBMVFC_AE_LS_LINK_BOUNCED:
3215 		default:
3216 			vhost->events_to_log |= IBMVFC_AE_LINKUP;
3217 			vhost->delay_init = 1;
3218 			__ibmvfc_reset_host(vhost);
3219 			break;
3220 		}
3221 
3222 		break;
3223 	case IBMVFC_AE_LINK_UP:
3224 		vhost->events_to_log |= IBMVFC_AE_LINKUP;
3225 		vhost->delay_init = 1;
3226 		__ibmvfc_reset_host(vhost);
3227 		break;
3228 	case IBMVFC_AE_SCN_FABRIC:
3229 	case IBMVFC_AE_SCN_DOMAIN:
3230 		vhost->events_to_log |= IBMVFC_AE_RSCN;
3231 		if (vhost->state < IBMVFC_HALTED) {
3232 			vhost->delay_init = 1;
3233 			__ibmvfc_reset_host(vhost);
3234 		}
3235 		break;
3236 	case IBMVFC_AE_SCN_NPORT:
3237 	case IBMVFC_AE_SCN_GROUP:
3238 		vhost->events_to_log |= IBMVFC_AE_RSCN;
3239 		ibmvfc_reinit_host(vhost);
3240 		break;
3241 	case IBMVFC_AE_ELS_LOGO:
3242 	case IBMVFC_AE_ELS_PRLO:
3243 	case IBMVFC_AE_ELS_PLOGI:
3244 		list_for_each_entry(tgt, &vhost->targets, queue) {
3245 			if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3246 				break;
3247 			if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3248 				continue;
3249 			if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3250 				continue;
3251 			if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3252 				continue;
3253 			if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3254 				tgt->logo_rcvd = 1;
3255 			if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3256 				ibmvfc_del_tgt(tgt);
3257 				ibmvfc_reinit_host(vhost);
3258 			}
3259 		}
3260 		break;
3261 	case IBMVFC_AE_LINK_DOWN:
3262 	case IBMVFC_AE_ADAPTER_FAILED:
3263 		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3264 		break;
3265 	case IBMVFC_AE_LINK_DEAD:
3266 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3267 		break;
3268 	case IBMVFC_AE_HALT:
3269 		ibmvfc_link_down(vhost, IBMVFC_HALTED);
3270 		break;
3271 	default:
3272 		dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3273 		break;
3274 	}
3275 }
3276 
3277 /**
3278  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3279  * @crq:	Command/Response queue
3280  * @vhost:	ibmvfc host struct
3281  * @evt_doneq:	Event done queue
3282  *
3283 **/
ibmvfc_handle_crq(struct ibmvfc_crq * crq,struct ibmvfc_host * vhost,struct list_head * evt_doneq)3284 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3285 			      struct list_head *evt_doneq)
3286 {
3287 	long rc;
3288 	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3289 
3290 	switch (crq->valid) {
3291 	case IBMVFC_CRQ_INIT_RSP:
3292 		switch (crq->format) {
3293 		case IBMVFC_CRQ_INIT:
3294 			dev_info(vhost->dev, "Partner initialized\n");
3295 			/* Send back a response */
3296 			rc = ibmvfc_send_crq_init_complete(vhost);
3297 			if (rc == 0)
3298 				ibmvfc_init_host(vhost);
3299 			else
3300 				dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3301 			break;
3302 		case IBMVFC_CRQ_INIT_COMPLETE:
3303 			dev_info(vhost->dev, "Partner initialization complete\n");
3304 			ibmvfc_init_host(vhost);
3305 			break;
3306 		default:
3307 			dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3308 		}
3309 		return;
3310 	case IBMVFC_CRQ_XPORT_EVENT:
3311 		vhost->state = IBMVFC_NO_CRQ;
3312 		vhost->logged_in = 0;
3313 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3314 		if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3315 			/* We need to re-setup the interpartition connection */
3316 			dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3317 			vhost->client_migrated = 1;
3318 
3319 			scsi_block_requests(vhost->host);
3320 			ibmvfc_purge_requests(vhost, DID_REQUEUE);
3321 			ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN);
3322 			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3323 			wake_up(&vhost->work_wait_q);
3324 		} else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3325 			dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3326 			ibmvfc_purge_requests(vhost, DID_ERROR);
3327 			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3328 			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3329 		} else {
3330 			dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3331 		}
3332 		return;
3333 	case IBMVFC_CRQ_CMD_RSP:
3334 		break;
3335 	default:
3336 		dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3337 		return;
3338 	}
3339 
3340 	if (crq->format == IBMVFC_ASYNC_EVENT)
3341 		return;
3342 
3343 	/* The only kind of payload CRQs we should get are responses to
3344 	 * things we send. Make sure this response is to something we
3345 	 * actually sent
3346 	 */
3347 	if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3348 		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3349 			crq->ioba);
3350 		return;
3351 	}
3352 
3353 	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3354 		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3355 			crq->ioba);
3356 		return;
3357 	}
3358 
3359 	spin_lock(&evt->queue->l_lock);
3360 	list_move_tail(&evt->queue_list, evt_doneq);
3361 	spin_unlock(&evt->queue->l_lock);
3362 }
3363 
3364 /**
3365  * ibmvfc_scan_finished - Check if the device scan is done.
3366  * @shost:	scsi host struct
3367  * @time:	current elapsed time
3368  *
3369  * Returns:
3370  *	0 if scan is not done / 1 if scan is done
3371  **/
ibmvfc_scan_finished(struct Scsi_Host * shost,unsigned long time)3372 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3373 {
3374 	unsigned long flags;
3375 	struct ibmvfc_host *vhost = shost_priv(shost);
3376 	int done = 0;
3377 
3378 	spin_lock_irqsave(shost->host_lock, flags);
3379 	if (!vhost->scan_timeout)
3380 		done = 1;
3381 	else if (time >= (vhost->scan_timeout * HZ)) {
3382 		dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3383 			 "continuing initialization\n", vhost->scan_timeout);
3384 		done = 1;
3385 	}
3386 
3387 	if (vhost->scan_complete) {
3388 		vhost->scan_timeout = init_timeout;
3389 		done = 1;
3390 	}
3391 	spin_unlock_irqrestore(shost->host_lock, flags);
3392 	return done;
3393 }
3394 
3395 /**
3396  * ibmvfc_sdev_init - Setup the device's task set value
3397  * @sdev:	struct scsi_device device to configure
3398  *
3399  * Set the device's task set value so that error handling works as
3400  * expected.
3401  *
3402  * Returns:
3403  *	0 on success / -ENXIO if device does not exist
3404  **/
ibmvfc_sdev_init(struct scsi_device * sdev)3405 static int ibmvfc_sdev_init(struct scsi_device *sdev)
3406 {
3407 	struct Scsi_Host *shost = sdev->host;
3408 	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3409 	struct ibmvfc_host *vhost = shost_priv(shost);
3410 	unsigned long flags = 0;
3411 
3412 	if (!rport || fc_remote_port_chkready(rport))
3413 		return -ENXIO;
3414 
3415 	spin_lock_irqsave(shost->host_lock, flags);
3416 	sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3417 	spin_unlock_irqrestore(shost->host_lock, flags);
3418 	return 0;
3419 }
3420 
3421 /**
3422  * ibmvfc_target_alloc - Setup the target's task set value
3423  * @starget:	struct scsi_target
3424  *
3425  * Set the target's task set value so that error handling works as
3426  * expected.
3427  *
3428  * Returns:
3429  *	0 on success / -ENXIO if device does not exist
3430  **/
ibmvfc_target_alloc(struct scsi_target * starget)3431 static int ibmvfc_target_alloc(struct scsi_target *starget)
3432 {
3433 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3434 	struct ibmvfc_host *vhost = shost_priv(shost);
3435 	unsigned long flags = 0;
3436 
3437 	spin_lock_irqsave(shost->host_lock, flags);
3438 	starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3439 	spin_unlock_irqrestore(shost->host_lock, flags);
3440 	return 0;
3441 }
3442 
3443 /**
3444  * ibmvfc_sdev_configure - Configure the device
3445  * @sdev:	struct scsi_device device to configure
3446  * @lim:	Request queue limits
3447  *
3448  * Enable allow_restart for a device if it is a disk. Adjust the
3449  * queue_depth here also.
3450  *
3451  * Returns:
3452  *	0
3453  **/
ibmvfc_sdev_configure(struct scsi_device * sdev,struct queue_limits * lim)3454 static int ibmvfc_sdev_configure(struct scsi_device *sdev,
3455 				 struct queue_limits *lim)
3456 {
3457 	struct Scsi_Host *shost = sdev->host;
3458 	unsigned long flags = 0;
3459 
3460 	spin_lock_irqsave(shost->host_lock, flags);
3461 	if (sdev->type == TYPE_DISK) {
3462 		sdev->allow_restart = 1;
3463 		blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3464 	}
3465 	spin_unlock_irqrestore(shost->host_lock, flags);
3466 	return 0;
3467 }
3468 
3469 /**
3470  * ibmvfc_change_queue_depth - Change the device's queue depth
3471  * @sdev:	scsi device struct
3472  * @qdepth:	depth to set
3473  *
3474  * Return value:
3475  * 	actual depth set
3476  **/
ibmvfc_change_queue_depth(struct scsi_device * sdev,int qdepth)3477 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3478 {
3479 	if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3480 		qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3481 
3482 	return scsi_change_queue_depth(sdev, qdepth);
3483 }
3484 
ibmvfc_show_host_partition_name(struct device * dev,struct device_attribute * attr,char * buf)3485 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3486 						 struct device_attribute *attr, char *buf)
3487 {
3488 	struct Scsi_Host *shost = class_to_shost(dev);
3489 	struct ibmvfc_host *vhost = shost_priv(shost);
3490 
3491 	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.partition_name);
3492 }
3493 
ibmvfc_show_host_device_name(struct device * dev,struct device_attribute * attr,char * buf)3494 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3495 					    struct device_attribute *attr, char *buf)
3496 {
3497 	struct Scsi_Host *shost = class_to_shost(dev);
3498 	struct ibmvfc_host *vhost = shost_priv(shost);
3499 
3500 	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.device_name);
3501 }
3502 
ibmvfc_show_host_loc_code(struct device * dev,struct device_attribute * attr,char * buf)3503 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3504 					 struct device_attribute *attr, char *buf)
3505 {
3506 	struct Scsi_Host *shost = class_to_shost(dev);
3507 	struct ibmvfc_host *vhost = shost_priv(shost);
3508 
3509 	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.port_loc_code);
3510 }
3511 
ibmvfc_show_host_drc_name(struct device * dev,struct device_attribute * attr,char * buf)3512 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3513 					 struct device_attribute *attr, char *buf)
3514 {
3515 	struct Scsi_Host *shost = class_to_shost(dev);
3516 	struct ibmvfc_host *vhost = shost_priv(shost);
3517 
3518 	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.drc_name);
3519 }
3520 
ibmvfc_show_host_npiv_version(struct device * dev,struct device_attribute * attr,char * buf)3521 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3522 					     struct device_attribute *attr, char *buf)
3523 {
3524 	struct Scsi_Host *shost = class_to_shost(dev);
3525 	struct ibmvfc_host *vhost = shost_priv(shost);
3526 	return sysfs_emit(buf, "%d\n",
3527 			  be32_to_cpu(vhost->login_buf->resp.version));
3528 }
3529 
ibmvfc_show_host_capabilities(struct device * dev,struct device_attribute * attr,char * buf)3530 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3531 					     struct device_attribute *attr, char *buf)
3532 {
3533 	struct Scsi_Host *shost = class_to_shost(dev);
3534 	struct ibmvfc_host *vhost = shost_priv(shost);
3535 	return sysfs_emit(buf, "%llx\n",
3536 			  be64_to_cpu(vhost->login_buf->resp.capabilities));
3537 }
3538 
3539 /**
3540  * ibmvfc_show_log_level - Show the adapter's error logging level
3541  * @dev:	class device struct
3542  * @attr:	unused
3543  * @buf:	buffer
3544  *
3545  * Return value:
3546  * 	number of bytes printed to buffer
3547  **/
ibmvfc_show_log_level(struct device * dev,struct device_attribute * attr,char * buf)3548 static ssize_t ibmvfc_show_log_level(struct device *dev,
3549 				     struct device_attribute *attr, char *buf)
3550 {
3551 	struct Scsi_Host *shost = class_to_shost(dev);
3552 	struct ibmvfc_host *vhost = shost_priv(shost);
3553 	unsigned long flags = 0;
3554 	int len;
3555 
3556 	spin_lock_irqsave(shost->host_lock, flags);
3557 	len = sysfs_emit(buf, "%d\n", vhost->log_level);
3558 	spin_unlock_irqrestore(shost->host_lock, flags);
3559 	return len;
3560 }
3561 
3562 /**
3563  * ibmvfc_store_log_level - Change the adapter's error logging level
3564  * @dev:	class device struct
3565  * @attr:	unused
3566  * @buf:	buffer
3567  * @count:      buffer size
3568  *
3569  * Return value:
3570  * 	number of bytes printed to buffer
3571  **/
ibmvfc_store_log_level(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)3572 static ssize_t ibmvfc_store_log_level(struct device *dev,
3573 				      struct device_attribute *attr,
3574 				      const char *buf, size_t count)
3575 {
3576 	struct Scsi_Host *shost = class_to_shost(dev);
3577 	struct ibmvfc_host *vhost = shost_priv(shost);
3578 	unsigned long flags = 0;
3579 
3580 	spin_lock_irqsave(shost->host_lock, flags);
3581 	vhost->log_level = simple_strtoul(buf, NULL, 10);
3582 	spin_unlock_irqrestore(shost->host_lock, flags);
3583 	return strlen(buf);
3584 }
3585 
ibmvfc_show_scsi_channels(struct device * dev,struct device_attribute * attr,char * buf)3586 static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3587 					 struct device_attribute *attr, char *buf)
3588 {
3589 	struct Scsi_Host *shost = class_to_shost(dev);
3590 	struct ibmvfc_host *vhost = shost_priv(shost);
3591 	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3592 	unsigned long flags = 0;
3593 	int len;
3594 
3595 	spin_lock_irqsave(shost->host_lock, flags);
3596 	len = sysfs_emit(buf, "%d\n", scsi->desired_queues);
3597 	spin_unlock_irqrestore(shost->host_lock, flags);
3598 	return len;
3599 }
3600 
ibmvfc_store_scsi_channels(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)3601 static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3602 					 struct device_attribute *attr,
3603 					 const char *buf, size_t count)
3604 {
3605 	struct Scsi_Host *shost = class_to_shost(dev);
3606 	struct ibmvfc_host *vhost = shost_priv(shost);
3607 	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3608 	unsigned long flags = 0;
3609 	unsigned int channels;
3610 
3611 	spin_lock_irqsave(shost->host_lock, flags);
3612 	channels = simple_strtoul(buf, NULL, 10);
3613 	scsi->desired_queues = min(channels, shost->nr_hw_queues);
3614 	ibmvfc_hard_reset_host(vhost);
3615 	spin_unlock_irqrestore(shost->host_lock, flags);
3616 	return strlen(buf);
3617 }
3618 
3619 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3620 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3621 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3622 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3623 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3624 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3625 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3626 		   ibmvfc_show_log_level, ibmvfc_store_log_level);
3627 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3628 		   ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3629 
3630 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3631 /**
3632  * ibmvfc_read_trace - Dump the adapter trace
3633  * @filp:		open sysfs file
3634  * @kobj:		kobject struct
3635  * @bin_attr:	bin_attribute struct
3636  * @buf:		buffer
3637  * @off:		offset
3638  * @count:		buffer size
3639  *
3640  * Return value:
3641  *	number of bytes printed to buffer
3642  **/
ibmvfc_read_trace(struct file * filp,struct kobject * kobj,const struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)3643 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3644 				 const struct bin_attribute *bin_attr,
3645 				 char *buf, loff_t off, size_t count)
3646 {
3647 	struct device *dev = kobj_to_dev(kobj);
3648 	struct Scsi_Host *shost = class_to_shost(dev);
3649 	struct ibmvfc_host *vhost = shost_priv(shost);
3650 	unsigned long flags = 0;
3651 	int size = IBMVFC_TRACE_SIZE;
3652 	char *src = (char *)vhost->trace;
3653 
3654 	if (off > size)
3655 		return 0;
3656 	if (off + count > size) {
3657 		size -= off;
3658 		count = size;
3659 	}
3660 
3661 	spin_lock_irqsave(shost->host_lock, flags);
3662 	memcpy(buf, &src[off], count);
3663 	spin_unlock_irqrestore(shost->host_lock, flags);
3664 	return count;
3665 }
3666 
3667 static const struct bin_attribute ibmvfc_trace_attr = {
3668 	.attr =	{
3669 		.name = "trace",
3670 		.mode = S_IRUGO,
3671 	},
3672 	.size = 0,
3673 	.read_new = ibmvfc_read_trace,
3674 };
3675 #endif
3676 
3677 static struct attribute *ibmvfc_host_attrs[] = {
3678 	&dev_attr_partition_name.attr,
3679 	&dev_attr_device_name.attr,
3680 	&dev_attr_port_loc_code.attr,
3681 	&dev_attr_drc_name.attr,
3682 	&dev_attr_npiv_version.attr,
3683 	&dev_attr_capabilities.attr,
3684 	&dev_attr_log_level.attr,
3685 	&dev_attr_nr_scsi_channels.attr,
3686 	NULL
3687 };
3688 
3689 ATTRIBUTE_GROUPS(ibmvfc_host);
3690 
3691 static const struct scsi_host_template driver_template = {
3692 	.module = THIS_MODULE,
3693 	.name = "IBM POWER Virtual FC Adapter",
3694 	.proc_name = IBMVFC_NAME,
3695 	.queuecommand = ibmvfc_queuecommand,
3696 	.eh_timed_out = fc_eh_timed_out,
3697 	.eh_abort_handler = ibmvfc_eh_abort_handler,
3698 	.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3699 	.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3700 	.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3701 	.sdev_init = ibmvfc_sdev_init,
3702 	.sdev_configure = ibmvfc_sdev_configure,
3703 	.target_alloc = ibmvfc_target_alloc,
3704 	.scan_finished = ibmvfc_scan_finished,
3705 	.change_queue_depth = ibmvfc_change_queue_depth,
3706 	.cmd_per_lun = 16,
3707 	.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3708 	.this_id = -1,
3709 	.sg_tablesize = SG_ALL,
3710 	.max_sectors = IBMVFC_MAX_SECTORS,
3711 	.shost_groups = ibmvfc_host_groups,
3712 	.track_queue_depth = 1,
3713 };
3714 
3715 /**
3716  * ibmvfc_next_async_crq - Returns the next entry in async queue
3717  * @vhost:	ibmvfc host struct
3718  *
3719  * Returns:
3720  *	Pointer to next entry in queue / NULL if empty
3721  **/
ibmvfc_next_async_crq(struct ibmvfc_host * vhost)3722 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3723 {
3724 	struct ibmvfc_queue *async_crq = &vhost->async_crq;
3725 	struct ibmvfc_async_crq *crq;
3726 
3727 	crq = &async_crq->msgs.async[async_crq->cur];
3728 	if (crq->valid & 0x80) {
3729 		if (++async_crq->cur == async_crq->size)
3730 			async_crq->cur = 0;
3731 		rmb();
3732 	} else
3733 		crq = NULL;
3734 
3735 	return crq;
3736 }
3737 
3738 /**
3739  * ibmvfc_next_crq - Returns the next entry in message queue
3740  * @vhost:	ibmvfc host struct
3741  *
3742  * Returns:
3743  *	Pointer to next entry in queue / NULL if empty
3744  **/
ibmvfc_next_crq(struct ibmvfc_host * vhost)3745 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3746 {
3747 	struct ibmvfc_queue *queue = &vhost->crq;
3748 	struct ibmvfc_crq *crq;
3749 
3750 	crq = &queue->msgs.crq[queue->cur];
3751 	if (crq->valid & 0x80) {
3752 		if (++queue->cur == queue->size)
3753 			queue->cur = 0;
3754 		rmb();
3755 	} else
3756 		crq = NULL;
3757 
3758 	return crq;
3759 }
3760 
3761 /**
3762  * ibmvfc_interrupt - Interrupt handler
3763  * @irq:		number of irq to handle, not used
3764  * @dev_instance: ibmvfc_host that received interrupt
3765  *
3766  * Returns:
3767  *	IRQ_HANDLED
3768  **/
ibmvfc_interrupt(int irq,void * dev_instance)3769 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3770 {
3771 	struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3772 	unsigned long flags;
3773 
3774 	spin_lock_irqsave(vhost->host->host_lock, flags);
3775 	vio_disable_interrupts(to_vio_dev(vhost->dev));
3776 	tasklet_schedule(&vhost->tasklet);
3777 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
3778 	return IRQ_HANDLED;
3779 }
3780 
3781 /**
3782  * ibmvfc_tasklet - Interrupt handler tasklet
3783  * @data:		ibmvfc host struct
3784  *
3785  * Returns:
3786  *	Nothing
3787  **/
ibmvfc_tasklet(void * data)3788 static void ibmvfc_tasklet(void *data)
3789 {
3790 	struct ibmvfc_host *vhost = data;
3791 	struct vio_dev *vdev = to_vio_dev(vhost->dev);
3792 	struct ibmvfc_crq *crq;
3793 	struct ibmvfc_async_crq *async;
3794 	struct ibmvfc_event *evt, *temp;
3795 	unsigned long flags;
3796 	int done = 0;
3797 	LIST_HEAD(evt_doneq);
3798 
3799 	spin_lock_irqsave(vhost->host->host_lock, flags);
3800 	spin_lock(vhost->crq.q_lock);
3801 	while (!done) {
3802 		/* Pull all the valid messages off the async CRQ */
3803 		while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3804 			ibmvfc_handle_async(async, vhost);
3805 			async->valid = 0;
3806 			wmb();
3807 		}
3808 
3809 		/* Pull all the valid messages off the CRQ */
3810 		while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3811 			ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3812 			crq->valid = 0;
3813 			wmb();
3814 		}
3815 
3816 		vio_enable_interrupts(vdev);
3817 		if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3818 			vio_disable_interrupts(vdev);
3819 			ibmvfc_handle_async(async, vhost);
3820 			async->valid = 0;
3821 			wmb();
3822 		} else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3823 			vio_disable_interrupts(vdev);
3824 			ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3825 			crq->valid = 0;
3826 			wmb();
3827 		} else
3828 			done = 1;
3829 	}
3830 
3831 	spin_unlock(vhost->crq.q_lock);
3832 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
3833 
3834 	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3835 		del_timer(&evt->timer);
3836 		list_del(&evt->queue_list);
3837 		ibmvfc_trc_end(evt);
3838 		evt->done(evt);
3839 	}
3840 }
3841 
ibmvfc_toggle_scrq_irq(struct ibmvfc_queue * scrq,int enable)3842 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3843 {
3844 	struct device *dev = scrq->vhost->dev;
3845 	struct vio_dev *vdev = to_vio_dev(dev);
3846 	unsigned long rc;
3847 	int irq_action = H_ENABLE_VIO_INTERRUPT;
3848 
3849 	if (!enable)
3850 		irq_action = H_DISABLE_VIO_INTERRUPT;
3851 
3852 	rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3853 				scrq->hw_irq, 0, 0);
3854 
3855 	if (rc)
3856 		dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3857 			enable ? "enable" : "disable", scrq->hwq_id, rc);
3858 
3859 	return rc;
3860 }
3861 
ibmvfc_handle_scrq(struct ibmvfc_crq * crq,struct ibmvfc_host * vhost,struct list_head * evt_doneq)3862 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3863 			       struct list_head *evt_doneq)
3864 {
3865 	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3866 
3867 	switch (crq->valid) {
3868 	case IBMVFC_CRQ_CMD_RSP:
3869 		break;
3870 	case IBMVFC_CRQ_XPORT_EVENT:
3871 		return;
3872 	default:
3873 		dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3874 		return;
3875 	}
3876 
3877 	/* The only kind of payload CRQs we should get are responses to
3878 	 * things we send. Make sure this response is to something we
3879 	 * actually sent
3880 	 */
3881 	if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3882 		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3883 			crq->ioba);
3884 		return;
3885 	}
3886 
3887 	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3888 		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3889 			crq->ioba);
3890 		return;
3891 	}
3892 
3893 	spin_lock(&evt->queue->l_lock);
3894 	list_move_tail(&evt->queue_list, evt_doneq);
3895 	spin_unlock(&evt->queue->l_lock);
3896 }
3897 
ibmvfc_next_scrq(struct ibmvfc_queue * scrq)3898 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3899 {
3900 	struct ibmvfc_crq *crq;
3901 
3902 	crq = &scrq->msgs.scrq[scrq->cur].crq;
3903 	if (crq->valid & 0x80) {
3904 		if (++scrq->cur == scrq->size)
3905 			scrq->cur = 0;
3906 		rmb();
3907 	} else
3908 		crq = NULL;
3909 
3910 	return crq;
3911 }
3912 
ibmvfc_drain_sub_crq(struct ibmvfc_queue * scrq)3913 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3914 {
3915 	struct ibmvfc_crq *crq;
3916 	struct ibmvfc_event *evt, *temp;
3917 	unsigned long flags;
3918 	int done = 0;
3919 	LIST_HEAD(evt_doneq);
3920 
3921 	spin_lock_irqsave(scrq->q_lock, flags);
3922 	while (!done) {
3923 		while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3924 			ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3925 			crq->valid = 0;
3926 			wmb();
3927 		}
3928 
3929 		ibmvfc_toggle_scrq_irq(scrq, 1);
3930 		if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3931 			ibmvfc_toggle_scrq_irq(scrq, 0);
3932 			ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3933 			crq->valid = 0;
3934 			wmb();
3935 		} else
3936 			done = 1;
3937 	}
3938 	spin_unlock_irqrestore(scrq->q_lock, flags);
3939 
3940 	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3941 		del_timer(&evt->timer);
3942 		list_del(&evt->queue_list);
3943 		ibmvfc_trc_end(evt);
3944 		evt->done(evt);
3945 	}
3946 }
3947 
ibmvfc_interrupt_mq(int irq,void * scrq_instance)3948 static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance)
3949 {
3950 	struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3951 
3952 	ibmvfc_toggle_scrq_irq(scrq, 0);
3953 	ibmvfc_drain_sub_crq(scrq);
3954 
3955 	return IRQ_HANDLED;
3956 }
3957 
3958 /**
3959  * ibmvfc_init_tgt - Set the next init job step for the target
3960  * @tgt:		ibmvfc target struct
3961  * @job_step:	job step to perform
3962  *
3963  **/
ibmvfc_init_tgt(struct ibmvfc_target * tgt,void (* job_step)(struct ibmvfc_target *))3964 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3965 			    void (*job_step) (struct ibmvfc_target *))
3966 {
3967 	if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3968 		tgt->job_step = job_step;
3969 	wake_up(&tgt->vhost->work_wait_q);
3970 }
3971 
3972 /**
3973  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3974  * @tgt:		ibmvfc target struct
3975  * @job_step:	initialization job step
3976  *
3977  * Returns: 1 if step will be retried / 0 if not
3978  *
3979  **/
ibmvfc_retry_tgt_init(struct ibmvfc_target * tgt,void (* job_step)(struct ibmvfc_target *))3980 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3981 				  void (*job_step) (struct ibmvfc_target *))
3982 {
3983 	if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3984 		ibmvfc_del_tgt(tgt);
3985 		wake_up(&tgt->vhost->work_wait_q);
3986 		return 0;
3987 	} else
3988 		ibmvfc_init_tgt(tgt, job_step);
3989 	return 1;
3990 }
3991 
3992 /* Defined in FC-LS */
3993 static const struct {
3994 	int code;
3995 	int retry;
3996 	int logged_in;
3997 } prli_rsp [] = {
3998 	{ 0, 1, 0 },
3999 	{ 1, 0, 1 },
4000 	{ 2, 1, 0 },
4001 	{ 3, 1, 0 },
4002 	{ 4, 0, 0 },
4003 	{ 5, 0, 0 },
4004 	{ 6, 0, 1 },
4005 	{ 7, 0, 0 },
4006 	{ 8, 1, 0 },
4007 };
4008 
4009 /**
4010  * ibmvfc_get_prli_rsp - Find PRLI response index
4011  * @flags:	PRLI response flags
4012  *
4013  **/
ibmvfc_get_prli_rsp(u16 flags)4014 static int ibmvfc_get_prli_rsp(u16 flags)
4015 {
4016 	int i;
4017 	int code = (flags & 0x0f00) >> 8;
4018 
4019 	for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
4020 		if (prli_rsp[i].code == code)
4021 			return i;
4022 
4023 	return 0;
4024 }
4025 
4026 /**
4027  * ibmvfc_tgt_prli_done - Completion handler for Process Login
4028  * @evt:	ibmvfc event struct
4029  *
4030  **/
ibmvfc_tgt_prli_done(struct ibmvfc_event * evt)4031 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
4032 {
4033 	struct ibmvfc_target *tgt = evt->tgt;
4034 	struct ibmvfc_host *vhost = evt->vhost;
4035 	struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
4036 	struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
4037 	u32 status = be16_to_cpu(rsp->common.status);
4038 	int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
4039 
4040 	vhost->discovery_threads--;
4041 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4042 	switch (status) {
4043 	case IBMVFC_MAD_SUCCESS:
4044 		tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
4045 			parms->type, parms->flags, parms->service_parms);
4046 
4047 		if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
4048 			index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
4049 			if (prli_rsp[index].logged_in) {
4050 				if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
4051 					tgt->need_login = 0;
4052 					tgt->ids.roles = 0;
4053 					if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
4054 						tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
4055 					if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
4056 						tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
4057 					tgt->add_rport = 1;
4058 				} else
4059 					ibmvfc_del_tgt(tgt);
4060 			} else if (prli_rsp[index].retry)
4061 				ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4062 			else
4063 				ibmvfc_del_tgt(tgt);
4064 		} else
4065 			ibmvfc_del_tgt(tgt);
4066 		break;
4067 	case IBMVFC_MAD_DRIVER_FAILED:
4068 		break;
4069 	case IBMVFC_MAD_CRQ_ERROR:
4070 		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4071 		break;
4072 	case IBMVFC_MAD_FAILED:
4073 	default:
4074 		if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
4075 		     be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
4076 			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4077 		else if (tgt->logo_rcvd)
4078 			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4079 		else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4080 			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4081 		else
4082 			ibmvfc_del_tgt(tgt);
4083 
4084 		tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4085 			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4086 			be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4087 		break;
4088 	}
4089 
4090 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4091 	ibmvfc_free_event(evt);
4092 	wake_up(&vhost->work_wait_q);
4093 }
4094 
4095 /**
4096  * ibmvfc_tgt_send_prli - Send a process login
4097  * @tgt:	ibmvfc target struct
4098  *
4099  **/
ibmvfc_tgt_send_prli(struct ibmvfc_target * tgt)4100 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4101 {
4102 	struct ibmvfc_process_login *prli;
4103 	struct ibmvfc_host *vhost = tgt->vhost;
4104 	struct ibmvfc_event *evt;
4105 
4106 	if (vhost->discovery_threads >= disc_threads)
4107 		return;
4108 
4109 	kref_get(&tgt->kref);
4110 	evt = ibmvfc_get_reserved_event(&vhost->crq);
4111 	if (!evt) {
4112 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4113 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4114 		__ibmvfc_reset_host(vhost);
4115 		return;
4116 	}
4117 	vhost->discovery_threads++;
4118 	ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4119 	evt->tgt = tgt;
4120 	prli = &evt->iu.prli;
4121 	memset(prli, 0, sizeof(*prli));
4122 	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4123 		prli->common.version = cpu_to_be32(2);
4124 		prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4125 	} else {
4126 		prli->common.version = cpu_to_be32(1);
4127 	}
4128 	prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4129 	prli->common.length = cpu_to_be16(sizeof(*prli));
4130 	prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4131 
4132 	prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4133 	prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4134 	prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4135 	prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4136 
4137 	if (cls3_error)
4138 		prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4139 
4140 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4141 	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4142 		vhost->discovery_threads--;
4143 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4144 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4145 	} else
4146 		tgt_dbg(tgt, "Sent process login\n");
4147 }
4148 
4149 /**
4150  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4151  * @evt:	ibmvfc event struct
4152  *
4153  **/
ibmvfc_tgt_plogi_done(struct ibmvfc_event * evt)4154 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4155 {
4156 	struct ibmvfc_target *tgt = evt->tgt;
4157 	struct ibmvfc_host *vhost = evt->vhost;
4158 	struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4159 	u32 status = be16_to_cpu(rsp->common.status);
4160 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4161 
4162 	vhost->discovery_threads--;
4163 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4164 	switch (status) {
4165 	case IBMVFC_MAD_SUCCESS:
4166 		tgt_dbg(tgt, "Port Login succeeded\n");
4167 		if (tgt->ids.port_name &&
4168 		    tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4169 			vhost->reinit = 1;
4170 			tgt_dbg(tgt, "Port re-init required\n");
4171 			break;
4172 		}
4173 		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4174 		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4175 		tgt->ids.port_id = tgt->scsi_id;
4176 		memcpy(&tgt->service_parms, &rsp->service_parms,
4177 		       sizeof(tgt->service_parms));
4178 		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4179 		       sizeof(tgt->service_parms_change));
4180 		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4181 		break;
4182 	case IBMVFC_MAD_DRIVER_FAILED:
4183 		break;
4184 	case IBMVFC_MAD_CRQ_ERROR:
4185 		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4186 		break;
4187 	case IBMVFC_MAD_FAILED:
4188 	default:
4189 		if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4190 			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4191 		else
4192 			ibmvfc_del_tgt(tgt);
4193 
4194 		tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4195 			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4196 					     be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4197 			ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4198 			ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4199 		break;
4200 	}
4201 
4202 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4203 	ibmvfc_free_event(evt);
4204 	wake_up(&vhost->work_wait_q);
4205 }
4206 
4207 /**
4208  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4209  * @tgt:	ibmvfc target struct
4210  *
4211  **/
ibmvfc_tgt_send_plogi(struct ibmvfc_target * tgt)4212 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4213 {
4214 	struct ibmvfc_port_login *plogi;
4215 	struct ibmvfc_host *vhost = tgt->vhost;
4216 	struct ibmvfc_event *evt;
4217 
4218 	if (vhost->discovery_threads >= disc_threads)
4219 		return;
4220 
4221 	kref_get(&tgt->kref);
4222 	tgt->logo_rcvd = 0;
4223 	evt = ibmvfc_get_reserved_event(&vhost->crq);
4224 	if (!evt) {
4225 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4226 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4227 		__ibmvfc_reset_host(vhost);
4228 		return;
4229 	}
4230 	vhost->discovery_threads++;
4231 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4232 	ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4233 	evt->tgt = tgt;
4234 	plogi = &evt->iu.plogi;
4235 	memset(plogi, 0, sizeof(*plogi));
4236 	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4237 		plogi->common.version = cpu_to_be32(2);
4238 		plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4239 	} else {
4240 		plogi->common.version = cpu_to_be32(1);
4241 	}
4242 	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4243 	plogi->common.length = cpu_to_be16(sizeof(*plogi));
4244 	plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4245 
4246 	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4247 		vhost->discovery_threads--;
4248 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4249 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4250 	} else
4251 		tgt_dbg(tgt, "Sent port login\n");
4252 }
4253 
4254 /**
4255  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4256  * @evt:	ibmvfc event struct
4257  *
4258  **/
ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event * evt)4259 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4260 {
4261 	struct ibmvfc_target *tgt = evt->tgt;
4262 	struct ibmvfc_host *vhost = evt->vhost;
4263 	struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4264 	u32 status = be16_to_cpu(rsp->common.status);
4265 
4266 	vhost->discovery_threads--;
4267 	ibmvfc_free_event(evt);
4268 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4269 
4270 	switch (status) {
4271 	case IBMVFC_MAD_SUCCESS:
4272 		tgt_dbg(tgt, "Implicit Logout succeeded\n");
4273 		break;
4274 	case IBMVFC_MAD_DRIVER_FAILED:
4275 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4276 		wake_up(&vhost->work_wait_q);
4277 		return;
4278 	case IBMVFC_MAD_FAILED:
4279 	default:
4280 		tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4281 		break;
4282 	}
4283 
4284 	ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
4285 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4286 	wake_up(&vhost->work_wait_q);
4287 }
4288 
4289 /**
4290  * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4291  * @tgt:		ibmvfc target struct
4292  * @done:		Routine to call when the event is responded to
4293  *
4294  * Returns:
4295  *	Allocated and initialized ibmvfc_event struct
4296  **/
__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target * tgt,void (* done)(struct ibmvfc_event *))4297 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4298 								 void (*done) (struct ibmvfc_event *))
4299 {
4300 	struct ibmvfc_implicit_logout *mad;
4301 	struct ibmvfc_host *vhost = tgt->vhost;
4302 	struct ibmvfc_event *evt;
4303 
4304 	kref_get(&tgt->kref);
4305 	evt = ibmvfc_get_reserved_event(&vhost->crq);
4306 	if (!evt)
4307 		return NULL;
4308 	ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT);
4309 	evt->tgt = tgt;
4310 	mad = &evt->iu.implicit_logout;
4311 	memset(mad, 0, sizeof(*mad));
4312 	mad->common.version = cpu_to_be32(1);
4313 	mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4314 	mad->common.length = cpu_to_be16(sizeof(*mad));
4315 	mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4316 	return evt;
4317 }
4318 
4319 /**
4320  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4321  * @tgt:		ibmvfc target struct
4322  *
4323  **/
ibmvfc_tgt_implicit_logout(struct ibmvfc_target * tgt)4324 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4325 {
4326 	struct ibmvfc_host *vhost = tgt->vhost;
4327 	struct ibmvfc_event *evt;
4328 
4329 	if (vhost->discovery_threads >= disc_threads)
4330 		return;
4331 
4332 	vhost->discovery_threads++;
4333 	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4334 						   ibmvfc_tgt_implicit_logout_done);
4335 	if (!evt) {
4336 		vhost->discovery_threads--;
4337 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4338 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4339 		__ibmvfc_reset_host(vhost);
4340 		return;
4341 	}
4342 
4343 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4344 	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4345 		vhost->discovery_threads--;
4346 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4347 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4348 	} else
4349 		tgt_dbg(tgt, "Sent Implicit Logout\n");
4350 }
4351 
4352 /**
4353  * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4354  * @evt:	ibmvfc event struct
4355  *
4356  **/
ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event * evt)4357 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4358 {
4359 	struct ibmvfc_target *tgt = evt->tgt;
4360 	struct ibmvfc_host *vhost = evt->vhost;
4361 	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4362 	u32 status = be16_to_cpu(mad->common.status);
4363 
4364 	vhost->discovery_threads--;
4365 	ibmvfc_free_event(evt);
4366 
4367 	/*
4368 	 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4369 	 * driver in which case we need to free up all the targets. If we are
4370 	 * not unloading, we will still go through a hard reset to get out of
4371 	 * offline state, so there is no need to track the old targets in that
4372 	 * case.
4373 	 */
4374 	if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4375 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4376 	else
4377 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4378 
4379 	tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4380 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4381 	wake_up(&vhost->work_wait_q);
4382 }
4383 
4384 /**
4385  * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4386  * @tgt:		ibmvfc target struct
4387  *
4388  **/
ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target * tgt)4389 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4390 {
4391 	struct ibmvfc_host *vhost = tgt->vhost;
4392 	struct ibmvfc_event *evt;
4393 
4394 	if (!vhost->logged_in) {
4395 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4396 		return;
4397 	}
4398 
4399 	if (vhost->discovery_threads >= disc_threads)
4400 		return;
4401 
4402 	vhost->discovery_threads++;
4403 	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4404 						   ibmvfc_tgt_implicit_logout_and_del_done);
4405 
4406 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4407 	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4408 		vhost->discovery_threads--;
4409 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4410 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4411 	} else
4412 		tgt_dbg(tgt, "Sent Implicit Logout\n");
4413 }
4414 
4415 /**
4416  * ibmvfc_tgt_move_login_done - Completion handler for Move Login
4417  * @evt:	ibmvfc event struct
4418  *
4419  **/
ibmvfc_tgt_move_login_done(struct ibmvfc_event * evt)4420 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4421 {
4422 	struct ibmvfc_target *tgt = evt->tgt;
4423 	struct ibmvfc_host *vhost = evt->vhost;
4424 	struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4425 	u32 status = be16_to_cpu(rsp->common.status);
4426 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4427 
4428 	vhost->discovery_threads--;
4429 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4430 	switch (status) {
4431 	case IBMVFC_MAD_SUCCESS:
4432 		tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4433 		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4434 		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4435 		tgt->scsi_id = tgt->new_scsi_id;
4436 		tgt->ids.port_id = tgt->scsi_id;
4437 		memcpy(&tgt->service_parms, &rsp->service_parms,
4438 		       sizeof(tgt->service_parms));
4439 		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4440 		       sizeof(tgt->service_parms_change));
4441 		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4442 		break;
4443 	case IBMVFC_MAD_DRIVER_FAILED:
4444 		break;
4445 	case IBMVFC_MAD_CRQ_ERROR:
4446 		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4447 		break;
4448 	case IBMVFC_MAD_FAILED:
4449 	default:
4450 		level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4451 
4452 		tgt_log(tgt, level,
4453 			"Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4454 			tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4455 			status);
4456 		break;
4457 	}
4458 
4459 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4460 	ibmvfc_free_event(evt);
4461 	wake_up(&vhost->work_wait_q);
4462 }
4463 
4464 
4465 /**
4466  * ibmvfc_tgt_move_login - Initiate a move login for specified target
4467  * @tgt:		ibmvfc target struct
4468  *
4469  **/
ibmvfc_tgt_move_login(struct ibmvfc_target * tgt)4470 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4471 {
4472 	struct ibmvfc_host *vhost = tgt->vhost;
4473 	struct ibmvfc_move_login *move;
4474 	struct ibmvfc_event *evt;
4475 
4476 	if (vhost->discovery_threads >= disc_threads)
4477 		return;
4478 
4479 	kref_get(&tgt->kref);
4480 	evt = ibmvfc_get_reserved_event(&vhost->crq);
4481 	if (!evt) {
4482 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4483 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4484 		__ibmvfc_reset_host(vhost);
4485 		return;
4486 	}
4487 	vhost->discovery_threads++;
4488 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4489 	ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT);
4490 	evt->tgt = tgt;
4491 	move = &evt->iu.move_login;
4492 	memset(move, 0, sizeof(*move));
4493 	move->common.version = cpu_to_be32(1);
4494 	move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4495 	move->common.length = cpu_to_be16(sizeof(*move));
4496 
4497 	move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4498 	move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4499 	move->wwpn = cpu_to_be64(tgt->wwpn);
4500 	move->node_name = cpu_to_be64(tgt->ids.node_name);
4501 
4502 	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4503 		vhost->discovery_threads--;
4504 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4505 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4506 	} else
4507 		tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4508 }
4509 
4510 /**
4511  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4512  * @mad:	ibmvfc passthru mad struct
4513  * @tgt:	ibmvfc target struct
4514  *
4515  * Returns:
4516  *	1 if PLOGI needed / 0 if PLOGI not needed
4517  **/
ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad * mad,struct ibmvfc_target * tgt)4518 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4519 				    struct ibmvfc_target *tgt)
4520 {
4521 	if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4522 		return 1;
4523 	if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4524 		return 1;
4525 	if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4526 		return 1;
4527 	return 0;
4528 }
4529 
4530 /**
4531  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
4532  * @evt:	ibmvfc event struct
4533  *
4534  **/
ibmvfc_tgt_adisc_done(struct ibmvfc_event * evt)4535 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4536 {
4537 	struct ibmvfc_target *tgt = evt->tgt;
4538 	struct ibmvfc_host *vhost = evt->vhost;
4539 	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4540 	u32 status = be16_to_cpu(mad->common.status);
4541 	u8 fc_reason, fc_explain;
4542 
4543 	vhost->discovery_threads--;
4544 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4545 	del_timer(&tgt->timer);
4546 
4547 	switch (status) {
4548 	case IBMVFC_MAD_SUCCESS:
4549 		tgt_dbg(tgt, "ADISC succeeded\n");
4550 		if (ibmvfc_adisc_needs_plogi(mad, tgt))
4551 			ibmvfc_del_tgt(tgt);
4552 		break;
4553 	case IBMVFC_MAD_DRIVER_FAILED:
4554 		break;
4555 	case IBMVFC_MAD_FAILED:
4556 	default:
4557 		ibmvfc_del_tgt(tgt);
4558 		fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4559 		fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4560 		tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4561 			 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4562 			 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4563 			 ibmvfc_get_fc_type(fc_reason), fc_reason,
4564 			 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4565 		break;
4566 	}
4567 
4568 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4569 	ibmvfc_free_event(evt);
4570 	wake_up(&vhost->work_wait_q);
4571 }
4572 
4573 /**
4574  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
4575  * @evt:		ibmvfc event struct
4576  *
4577  **/
ibmvfc_init_passthru(struct ibmvfc_event * evt)4578 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4579 {
4580 	struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4581 
4582 	memset(mad, 0, sizeof(*mad));
4583 	mad->common.version = cpu_to_be32(1);
4584 	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4585 	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4586 	mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4587 		offsetof(struct ibmvfc_passthru_mad, iu));
4588 	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4589 	mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4590 	mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4591 	mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4592 		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4593 		offsetof(struct ibmvfc_passthru_fc_iu, payload));
4594 	mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4595 	mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4596 		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4597 		offsetof(struct ibmvfc_passthru_fc_iu, response));
4598 	mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4599 }
4600 
4601 /**
4602  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4603  * @evt:		ibmvfc event struct
4604  *
4605  * Just cleanup this event struct. Everything else is handled by
4606  * the ADISC completion handler. If the ADISC never actually comes
4607  * back, we still have the timer running on the ADISC event struct
4608  * which will fire and cause the CRQ to get reset.
4609  *
4610  **/
ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event * evt)4611 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4612 {
4613 	struct ibmvfc_host *vhost = evt->vhost;
4614 	struct ibmvfc_target *tgt = evt->tgt;
4615 
4616 	tgt_dbg(tgt, "ADISC cancel complete\n");
4617 	vhost->abort_threads--;
4618 	ibmvfc_free_event(evt);
4619 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4620 	wake_up(&vhost->work_wait_q);
4621 }
4622 
4623 /**
4624  * ibmvfc_adisc_timeout - Handle an ADISC timeout
4625  * @t:		ibmvfc target struct
4626  *
4627  * If an ADISC times out, send a cancel. If the cancel times
4628  * out, reset the CRQ. When the ADISC comes back as cancelled,
4629  * log back into the target.
4630  **/
ibmvfc_adisc_timeout(struct timer_list * t)4631 static void ibmvfc_adisc_timeout(struct timer_list *t)
4632 {
4633 	struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
4634 	struct ibmvfc_host *vhost = tgt->vhost;
4635 	struct ibmvfc_event *evt;
4636 	struct ibmvfc_tmf *tmf;
4637 	unsigned long flags;
4638 	int rc;
4639 
4640 	tgt_dbg(tgt, "ADISC timeout\n");
4641 	spin_lock_irqsave(vhost->host->host_lock, flags);
4642 	if (vhost->abort_threads >= disc_threads ||
4643 	    tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4644 	    vhost->state != IBMVFC_INITIALIZING ||
4645 	    vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4646 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
4647 		return;
4648 	}
4649 
4650 	vhost->abort_threads++;
4651 	kref_get(&tgt->kref);
4652 	evt = ibmvfc_get_reserved_event(&vhost->crq);
4653 	if (!evt) {
4654 		tgt_err(tgt, "Failed to get cancel event for ADISC.\n");
4655 		vhost->abort_threads--;
4656 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4657 		__ibmvfc_reset_host(vhost);
4658 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
4659 		return;
4660 	}
4661 	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
4662 
4663 	evt->tgt = tgt;
4664 	tmf = &evt->iu.tmf;
4665 	memset(tmf, 0, sizeof(*tmf));
4666 	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4667 		tmf->common.version = cpu_to_be32(2);
4668 		tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4669 	} else {
4670 		tmf->common.version = cpu_to_be32(1);
4671 	}
4672 	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4673 	tmf->common.length = cpu_to_be16(sizeof(*tmf));
4674 	tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4675 	tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4676 
4677 	rc = ibmvfc_send_event(evt, vhost, default_timeout);
4678 
4679 	if (rc) {
4680 		tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4681 		vhost->abort_threads--;
4682 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4683 		__ibmvfc_reset_host(vhost);
4684 	} else
4685 		tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4686 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4687 }
4688 
4689 /**
4690  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4691  * @tgt:		ibmvfc target struct
4692  *
4693  * When sending an ADISC we end up with two timers running. The
4694  * first timer is the timer in the ibmvfc target struct. If this
4695  * fires, we send a cancel to the target. The second timer is the
4696  * timer on the ibmvfc event for the ADISC, which is longer. If that
4697  * fires, it means the ADISC timed out and our attempt to cancel it
4698  * also failed, so we need to reset the CRQ.
4699  **/
ibmvfc_tgt_adisc(struct ibmvfc_target * tgt)4700 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4701 {
4702 	struct ibmvfc_passthru_mad *mad;
4703 	struct ibmvfc_host *vhost = tgt->vhost;
4704 	struct ibmvfc_event *evt;
4705 
4706 	if (vhost->discovery_threads >= disc_threads)
4707 		return;
4708 
4709 	kref_get(&tgt->kref);
4710 	evt = ibmvfc_get_reserved_event(&vhost->crq);
4711 	if (!evt) {
4712 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4713 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4714 		__ibmvfc_reset_host(vhost);
4715 		return;
4716 	}
4717 	vhost->discovery_threads++;
4718 	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
4719 	evt->tgt = tgt;
4720 
4721 	ibmvfc_init_passthru(evt);
4722 	mad = &evt->iu.passthru;
4723 	mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4724 	mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4725 	mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4726 
4727 	mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4728 	memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4729 	       sizeof(vhost->login_buf->resp.port_name));
4730 	memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4731 	       sizeof(vhost->login_buf->resp.node_name));
4732 	mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4733 
4734 	if (timer_pending(&tgt->timer))
4735 		mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4736 	else {
4737 		tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4738 		add_timer(&tgt->timer);
4739 	}
4740 
4741 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4742 	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4743 		vhost->discovery_threads--;
4744 		del_timer(&tgt->timer);
4745 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4746 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4747 	} else
4748 		tgt_dbg(tgt, "Sent ADISC\n");
4749 }
4750 
4751 /**
4752  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4753  * @evt:	ibmvfc event struct
4754  *
4755  **/
ibmvfc_tgt_query_target_done(struct ibmvfc_event * evt)4756 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4757 {
4758 	struct ibmvfc_target *tgt = evt->tgt;
4759 	struct ibmvfc_host *vhost = evt->vhost;
4760 	struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4761 	u32 status = be16_to_cpu(rsp->common.status);
4762 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4763 
4764 	vhost->discovery_threads--;
4765 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4766 	switch (status) {
4767 	case IBMVFC_MAD_SUCCESS:
4768 		tgt_dbg(tgt, "Query Target succeeded\n");
4769 		if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4770 			ibmvfc_del_tgt(tgt);
4771 		else
4772 			ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
4773 		break;
4774 	case IBMVFC_MAD_DRIVER_FAILED:
4775 		break;
4776 	case IBMVFC_MAD_CRQ_ERROR:
4777 		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4778 		break;
4779 	case IBMVFC_MAD_FAILED:
4780 	default:
4781 		if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4782 		    be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4783 		    be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4784 			ibmvfc_del_tgt(tgt);
4785 		else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4786 			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4787 		else
4788 			ibmvfc_del_tgt(tgt);
4789 
4790 		tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4791 			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4792 			be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4793 			ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4794 			ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4795 			status);
4796 		break;
4797 	}
4798 
4799 	kref_put(&tgt->kref, ibmvfc_release_tgt);
4800 	ibmvfc_free_event(evt);
4801 	wake_up(&vhost->work_wait_q);
4802 }
4803 
4804 /**
4805  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4806  * @tgt:	ibmvfc target struct
4807  *
4808  **/
ibmvfc_tgt_query_target(struct ibmvfc_target * tgt)4809 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4810 {
4811 	struct ibmvfc_query_tgt *query_tgt;
4812 	struct ibmvfc_host *vhost = tgt->vhost;
4813 	struct ibmvfc_event *evt;
4814 
4815 	if (vhost->discovery_threads >= disc_threads)
4816 		return;
4817 
4818 	kref_get(&tgt->kref);
4819 	evt = ibmvfc_get_reserved_event(&vhost->crq);
4820 	if (!evt) {
4821 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4822 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4823 		__ibmvfc_reset_host(vhost);
4824 		return;
4825 	}
4826 	vhost->discovery_threads++;
4827 	evt->tgt = tgt;
4828 	ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
4829 	query_tgt = &evt->iu.query_tgt;
4830 	memset(query_tgt, 0, sizeof(*query_tgt));
4831 	query_tgt->common.version = cpu_to_be32(1);
4832 	query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4833 	query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4834 	query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4835 
4836 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4837 	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4838 		vhost->discovery_threads--;
4839 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4840 		kref_put(&tgt->kref, ibmvfc_release_tgt);
4841 	} else
4842 		tgt_dbg(tgt, "Sent Query Target\n");
4843 }
4844 
4845 /**
4846  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4847  * @vhost:		ibmvfc host struct
4848  * @target:		Holds SCSI ID to allocate target forand the WWPN
4849  *
4850  * Returns:
4851  *	0 on success / other on failure
4852  **/
ibmvfc_alloc_target(struct ibmvfc_host * vhost,struct ibmvfc_discover_targets_entry * target)4853 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4854 			       struct ibmvfc_discover_targets_entry *target)
4855 {
4856 	struct ibmvfc_target *stgt = NULL;
4857 	struct ibmvfc_target *wtgt = NULL;
4858 	struct ibmvfc_target *tgt;
4859 	unsigned long flags;
4860 	u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4861 	u64 wwpn = be64_to_cpu(target->wwpn);
4862 
4863 	/* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4864 	spin_lock_irqsave(vhost->host->host_lock, flags);
4865 	list_for_each_entry(tgt, &vhost->targets, queue) {
4866 		if (tgt->wwpn == wwpn) {
4867 			wtgt = tgt;
4868 			break;
4869 		}
4870 	}
4871 
4872 	list_for_each_entry(tgt, &vhost->targets, queue) {
4873 		if (tgt->scsi_id == scsi_id) {
4874 			stgt = tgt;
4875 			break;
4876 		}
4877 	}
4878 
4879 	if (wtgt && !stgt) {
4880 		/*
4881 		 * A WWPN target has moved and we still are tracking the old
4882 		 * SCSI ID.  The only way we should be able to get here is if
4883 		 * we attempted to send an implicit logout for the old SCSI ID
4884 		 * and it failed for some reason, such as there being I/O
4885 		 * pending to the target. In this case, we will have already
4886 		 * deleted the rport from the FC transport so we do a move
4887 		 * login, which works even with I/O pending, however, if
4888 		 * there is still I/O pending, it will stay outstanding, so
4889 		 * we only do this if fast fail is disabled for the rport,
4890 		 * otherwise we let terminate_rport_io clean up the port
4891 		 * before we login at the new location.
4892 		 */
4893 		if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4894 			if (wtgt->move_login) {
4895 				/*
4896 				 * Do a move login here. The old target is no longer
4897 				 * known to the transport layer We don't use the
4898 				 * normal ibmvfc_set_tgt_action to set this, as we
4899 				 * don't normally want to allow this state change.
4900 				 */
4901 				wtgt->new_scsi_id = scsi_id;
4902 				wtgt->action = IBMVFC_TGT_ACTION_INIT;
4903 				wtgt->init_retries = 0;
4904 				ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login);
4905 			}
4906 			goto unlock_out;
4907 		} else {
4908 			tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4909 				wtgt->action, wtgt->rport);
4910 		}
4911 	} else if (stgt) {
4912 		if (tgt->need_login)
4913 			ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4914 		goto unlock_out;
4915 	}
4916 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4917 
4918 	tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
4919 	memset(tgt, 0, sizeof(*tgt));
4920 	tgt->scsi_id = scsi_id;
4921 	tgt->wwpn = wwpn;
4922 	tgt->vhost = vhost;
4923 	tgt->need_login = 1;
4924 	timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4925 	kref_init(&tgt->kref);
4926 	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4927 	spin_lock_irqsave(vhost->host->host_lock, flags);
4928 	tgt->cancel_key = vhost->task_set++;
4929 	list_add_tail(&tgt->queue, &vhost->targets);
4930 
4931 unlock_out:
4932 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4933 	return 0;
4934 }
4935 
4936 /**
4937  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4938  * @vhost:		ibmvfc host struct
4939  *
4940  * Returns:
4941  *	0 on success / other on failure
4942  **/
ibmvfc_alloc_targets(struct ibmvfc_host * vhost)4943 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4944 {
4945 	int i, rc;
4946 
4947 	for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4948 		rc = ibmvfc_alloc_target(vhost, &vhost->scsi_scrqs.disc_buf[i]);
4949 
4950 	return rc;
4951 }
4952 
4953 /**
4954  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4955  * @evt:	ibmvfc event struct
4956  *
4957  **/
ibmvfc_discover_targets_done(struct ibmvfc_event * evt)4958 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4959 {
4960 	struct ibmvfc_host *vhost = evt->vhost;
4961 	struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4962 	u32 mad_status = be16_to_cpu(rsp->common.status);
4963 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4964 
4965 	switch (mad_status) {
4966 	case IBMVFC_MAD_SUCCESS:
4967 		ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4968 		vhost->num_targets = be32_to_cpu(rsp->num_written);
4969 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4970 		break;
4971 	case IBMVFC_MAD_FAILED:
4972 		level += ibmvfc_retry_host_init(vhost);
4973 		ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4974 			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4975 			   be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4976 		break;
4977 	case IBMVFC_MAD_DRIVER_FAILED:
4978 		break;
4979 	default:
4980 		dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4981 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4982 		break;
4983 	}
4984 
4985 	ibmvfc_free_event(evt);
4986 	wake_up(&vhost->work_wait_q);
4987 }
4988 
4989 /**
4990  * ibmvfc_discover_targets - Send Discover Targets MAD
4991  * @vhost:	ibmvfc host struct
4992  *
4993  **/
ibmvfc_discover_targets(struct ibmvfc_host * vhost)4994 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4995 {
4996 	struct ibmvfc_discover_targets *mad;
4997 	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
4998 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4999 
5000 	if (!evt) {
5001 		ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n");
5002 		ibmvfc_hard_reset_host(vhost);
5003 		return;
5004 	}
5005 
5006 	ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
5007 	mad = &evt->iu.discover_targets;
5008 	memset(mad, 0, sizeof(*mad));
5009 	mad->common.version = cpu_to_be32(1);
5010 	mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
5011 	mad->common.length = cpu_to_be16(sizeof(*mad));
5012 	mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5013 	mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma);
5014 	mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5015 	mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
5016 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5017 
5018 	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5019 		ibmvfc_dbg(vhost, "Sent discover targets\n");
5020 	else
5021 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5022 }
5023 
ibmvfc_channel_setup_done(struct ibmvfc_event * evt)5024 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
5025 {
5026 	struct ibmvfc_host *vhost = evt->vhost;
5027 	struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
5028 	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5029 	u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
5030 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5031 	int flags, active_queues, i;
5032 
5033 	ibmvfc_free_event(evt);
5034 
5035 	switch (mad_status) {
5036 	case IBMVFC_MAD_SUCCESS:
5037 		ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
5038 		flags = be32_to_cpu(setup->flags);
5039 		vhost->do_enquiry = 0;
5040 		active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
5041 		scrqs->active_queues = active_queues;
5042 
5043 		if (flags & IBMVFC_CHANNELS_CANCELED) {
5044 			ibmvfc_dbg(vhost, "Channels Canceled\n");
5045 			vhost->using_channels = 0;
5046 		} else {
5047 			if (active_queues)
5048 				vhost->using_channels = 1;
5049 			for (i = 0; i < active_queues; i++)
5050 				scrqs->scrqs[i].vios_cookie =
5051 					be64_to_cpu(setup->channel_handles[i]);
5052 
5053 			ibmvfc_dbg(vhost, "Using %u channels\n",
5054 				   vhost->scsi_scrqs.active_queues);
5055 		}
5056 		break;
5057 	case IBMVFC_MAD_FAILED:
5058 		level += ibmvfc_retry_host_init(vhost);
5059 		ibmvfc_log(vhost, level, "Channel Setup failed\n");
5060 		fallthrough;
5061 	case IBMVFC_MAD_DRIVER_FAILED:
5062 		return;
5063 	default:
5064 		dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
5065 			mad_status);
5066 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5067 		return;
5068 	}
5069 
5070 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5071 	wake_up(&vhost->work_wait_q);
5072 }
5073 
ibmvfc_channel_setup(struct ibmvfc_host * vhost)5074 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
5075 {
5076 	struct ibmvfc_channel_setup_mad *mad;
5077 	struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
5078 	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5079 	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5080 	unsigned int num_channels =
5081 		min(scrqs->desired_queues, vhost->max_vios_scsi_channels);
5082 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5083 	int i;
5084 
5085 	if (!evt) {
5086 		ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n");
5087 		ibmvfc_hard_reset_host(vhost);
5088 		return;
5089 	}
5090 
5091 	memset(setup_buf, 0, sizeof(*setup_buf));
5092 	if (num_channels == 0)
5093 		setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
5094 	else {
5095 		setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
5096 		for (i = 0; i < num_channels; i++)
5097 			setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
5098 	}
5099 
5100 	ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
5101 	mad = &evt->iu.channel_setup;
5102 	memset(mad, 0, sizeof(*mad));
5103 	mad->common.version = cpu_to_be32(1);
5104 	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
5105 	mad->common.length = cpu_to_be16(sizeof(*mad));
5106 	mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
5107 	mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
5108 
5109 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5110 
5111 	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5112 		ibmvfc_dbg(vhost, "Sent channel setup\n");
5113 	else
5114 		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
5115 }
5116 
ibmvfc_channel_enquiry_done(struct ibmvfc_event * evt)5117 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
5118 {
5119 	struct ibmvfc_host *vhost = evt->vhost;
5120 	struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
5121 	u32 mad_status = be16_to_cpu(rsp->common.status);
5122 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5123 
5124 	switch (mad_status) {
5125 	case IBMVFC_MAD_SUCCESS:
5126 		ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
5127 		vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
5128 		ibmvfc_free_event(evt);
5129 		break;
5130 	case IBMVFC_MAD_FAILED:
5131 		level += ibmvfc_retry_host_init(vhost);
5132 		ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
5133 		fallthrough;
5134 	case IBMVFC_MAD_DRIVER_FAILED:
5135 		ibmvfc_free_event(evt);
5136 		return;
5137 	default:
5138 		dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
5139 			mad_status);
5140 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5141 		ibmvfc_free_event(evt);
5142 		return;
5143 	}
5144 
5145 	ibmvfc_channel_setup(vhost);
5146 }
5147 
ibmvfc_channel_enquiry(struct ibmvfc_host * vhost)5148 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5149 {
5150 	struct ibmvfc_channel_enquiry *mad;
5151 	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5152 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5153 
5154 	if (!evt) {
5155 		ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n");
5156 		ibmvfc_hard_reset_host(vhost);
5157 		return;
5158 	}
5159 
5160 	ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT);
5161 	mad = &evt->iu.channel_enquiry;
5162 	memset(mad, 0, sizeof(*mad));
5163 	mad->common.version = cpu_to_be32(1);
5164 	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5165 	mad->common.length = cpu_to_be16(sizeof(*mad));
5166 
5167 	if (mig_channels_only)
5168 		mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5169 	if (mig_no_less_channels)
5170 		mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5171 
5172 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5173 
5174 	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5175 		ibmvfc_dbg(vhost, "Send channel enquiry\n");
5176 	else
5177 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5178 }
5179 
5180 /**
5181  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
5182  * @evt:	ibmvfc event struct
5183  *
5184  **/
ibmvfc_npiv_login_done(struct ibmvfc_event * evt)5185 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5186 {
5187 	struct ibmvfc_host *vhost = evt->vhost;
5188 	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5189 	struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5190 	unsigned int npiv_max_sectors;
5191 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5192 
5193 	switch (mad_status) {
5194 	case IBMVFC_MAD_SUCCESS:
5195 		ibmvfc_free_event(evt);
5196 		break;
5197 	case IBMVFC_MAD_FAILED:
5198 		if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5199 			level += ibmvfc_retry_host_init(vhost);
5200 		else
5201 			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5202 		ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5203 			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5204 						be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5205 		ibmvfc_free_event(evt);
5206 		return;
5207 	case IBMVFC_MAD_CRQ_ERROR:
5208 		ibmvfc_retry_host_init(vhost);
5209 		fallthrough;
5210 	case IBMVFC_MAD_DRIVER_FAILED:
5211 		ibmvfc_free_event(evt);
5212 		return;
5213 	default:
5214 		dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5215 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5216 		ibmvfc_free_event(evt);
5217 		return;
5218 	}
5219 
5220 	vhost->client_migrated = 0;
5221 
5222 	if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5223 		dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5224 			rsp->flags);
5225 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5226 		wake_up(&vhost->work_wait_q);
5227 		return;
5228 	}
5229 
5230 	if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5231 		dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5232 			rsp->max_cmds);
5233 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5234 		wake_up(&vhost->work_wait_q);
5235 		return;
5236 	}
5237 
5238 	vhost->logged_in = 1;
5239 	npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), max_sectors);
5240 	dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5241 		 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5242 		 rsp->drc_name, npiv_max_sectors);
5243 
5244 	fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5245 	fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5246 	fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5247 	fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5248 	fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5249 	fc_host_supported_classes(vhost->host) = 0;
5250 	if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5251 		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5252 	if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5253 		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5254 	if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5255 		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5256 	fc_host_maxframe_size(vhost->host) =
5257 		be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5258 
5259 	vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5260 	vhost->host->max_sectors = npiv_max_sectors;
5261 
5262 	if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5263 		ibmvfc_channel_enquiry(vhost);
5264 	} else {
5265 		vhost->do_enquiry = 0;
5266 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5267 		wake_up(&vhost->work_wait_q);
5268 	}
5269 }
5270 
5271 /**
5272  * ibmvfc_npiv_login - Sends NPIV login
5273  * @vhost:	ibmvfc host struct
5274  *
5275  **/
ibmvfc_npiv_login(struct ibmvfc_host * vhost)5276 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5277 {
5278 	struct ibmvfc_npiv_login_mad *mad;
5279 	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5280 
5281 	if (!evt) {
5282 		ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n");
5283 		ibmvfc_hard_reset_host(vhost);
5284 		return;
5285 	}
5286 
5287 	ibmvfc_gather_partition_info(vhost);
5288 	ibmvfc_set_login_info(vhost);
5289 	ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
5290 
5291 	memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5292 	mad = &evt->iu.npiv_login;
5293 	memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5294 	mad->common.version = cpu_to_be32(1);
5295 	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5296 	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5297 	mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5298 	mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5299 
5300 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5301 
5302 	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5303 		ibmvfc_dbg(vhost, "Sent NPIV login\n");
5304 	else
5305 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5306 }
5307 
5308 /**
5309  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5310  * @evt:		ibmvfc event struct
5311  *
5312  **/
ibmvfc_npiv_logout_done(struct ibmvfc_event * evt)5313 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5314 {
5315 	struct ibmvfc_host *vhost = evt->vhost;
5316 	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5317 
5318 	ibmvfc_free_event(evt);
5319 
5320 	switch (mad_status) {
5321 	case IBMVFC_MAD_SUCCESS:
5322 		if (list_empty(&vhost->crq.sent) &&
5323 		    vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5324 			ibmvfc_init_host(vhost);
5325 			return;
5326 		}
5327 		break;
5328 	case IBMVFC_MAD_FAILED:
5329 	case IBMVFC_MAD_NOT_SUPPORTED:
5330 	case IBMVFC_MAD_CRQ_ERROR:
5331 	case IBMVFC_MAD_DRIVER_FAILED:
5332 	default:
5333 		ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5334 		break;
5335 	}
5336 
5337 	ibmvfc_hard_reset_host(vhost);
5338 }
5339 
5340 /**
5341  * ibmvfc_npiv_logout - Issue an NPIV Logout
5342  * @vhost:		ibmvfc host struct
5343  *
5344  **/
ibmvfc_npiv_logout(struct ibmvfc_host * vhost)5345 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5346 {
5347 	struct ibmvfc_npiv_logout_mad *mad;
5348 	struct ibmvfc_event *evt;
5349 
5350 	evt = ibmvfc_get_reserved_event(&vhost->crq);
5351 	if (!evt) {
5352 		ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n");
5353 		ibmvfc_hard_reset_host(vhost);
5354 		return;
5355 	}
5356 
5357 	ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
5358 
5359 	mad = &evt->iu.npiv_logout;
5360 	memset(mad, 0, sizeof(*mad));
5361 	mad->common.version = cpu_to_be32(1);
5362 	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5363 	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5364 
5365 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
5366 
5367 	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5368 		ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5369 	else
5370 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5371 }
5372 
5373 /**
5374  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
5375  * @vhost:		ibmvfc host struct
5376  *
5377  * Returns:
5378  *	1 if work to do / 0 if not
5379  **/
ibmvfc_dev_init_to_do(struct ibmvfc_host * vhost)5380 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5381 {
5382 	struct ibmvfc_target *tgt;
5383 
5384 	list_for_each_entry(tgt, &vhost->targets, queue) {
5385 		if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5386 		    tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5387 			return 1;
5388 	}
5389 
5390 	return 0;
5391 }
5392 
5393 /**
5394  * ibmvfc_dev_logo_to_do - Is there target logout work to do?
5395  * @vhost:		ibmvfc host struct
5396  *
5397  * Returns:
5398  *	1 if work to do / 0 if not
5399  **/
ibmvfc_dev_logo_to_do(struct ibmvfc_host * vhost)5400 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5401 {
5402 	struct ibmvfc_target *tgt;
5403 
5404 	list_for_each_entry(tgt, &vhost->targets, queue) {
5405 		if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5406 		    tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5407 			return 1;
5408 	}
5409 	return 0;
5410 }
5411 
5412 /**
5413  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5414  * @vhost:		ibmvfc host struct
5415  *
5416  * Returns:
5417  *	1 if work to do / 0 if not
5418  **/
__ibmvfc_work_to_do(struct ibmvfc_host * vhost)5419 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5420 {
5421 	struct ibmvfc_target *tgt;
5422 
5423 	if (kthread_should_stop())
5424 		return 1;
5425 	switch (vhost->action) {
5426 	case IBMVFC_HOST_ACTION_NONE:
5427 	case IBMVFC_HOST_ACTION_INIT_WAIT:
5428 	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5429 		return 0;
5430 	case IBMVFC_HOST_ACTION_TGT_INIT:
5431 	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5432 		if (vhost->discovery_threads == disc_threads)
5433 			return 0;
5434 		list_for_each_entry(tgt, &vhost->targets, queue)
5435 			if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5436 				return 1;
5437 		list_for_each_entry(tgt, &vhost->targets, queue)
5438 			if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5439 				return 0;
5440 		return 1;
5441 	case IBMVFC_HOST_ACTION_TGT_DEL:
5442 	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5443 		if (vhost->discovery_threads == disc_threads)
5444 			return 0;
5445 		list_for_each_entry(tgt, &vhost->targets, queue)
5446 			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5447 				return 1;
5448 		list_for_each_entry(tgt, &vhost->targets, queue)
5449 			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5450 				return 0;
5451 		return 1;
5452 	case IBMVFC_HOST_ACTION_LOGO:
5453 	case IBMVFC_HOST_ACTION_INIT:
5454 	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5455 	case IBMVFC_HOST_ACTION_QUERY:
5456 	case IBMVFC_HOST_ACTION_RESET:
5457 	case IBMVFC_HOST_ACTION_REENABLE:
5458 	default:
5459 		break;
5460 	}
5461 
5462 	return 1;
5463 }
5464 
5465 /**
5466  * ibmvfc_work_to_do - Is there task level work to do?
5467  * @vhost:		ibmvfc host struct
5468  *
5469  * Returns:
5470  *	1 if work to do / 0 if not
5471  **/
ibmvfc_work_to_do(struct ibmvfc_host * vhost)5472 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5473 {
5474 	unsigned long flags;
5475 	int rc;
5476 
5477 	spin_lock_irqsave(vhost->host->host_lock, flags);
5478 	rc = __ibmvfc_work_to_do(vhost);
5479 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5480 	return rc;
5481 }
5482 
5483 /**
5484  * ibmvfc_log_ae - Log async events if necessary
5485  * @vhost:		ibmvfc host struct
5486  * @events:		events to log
5487  *
5488  **/
ibmvfc_log_ae(struct ibmvfc_host * vhost,int events)5489 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5490 {
5491 	if (events & IBMVFC_AE_RSCN)
5492 		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
5493 	if ((events & IBMVFC_AE_LINKDOWN) &&
5494 	    vhost->state >= IBMVFC_HALTED)
5495 		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
5496 	if ((events & IBMVFC_AE_LINKUP) &&
5497 	    vhost->state == IBMVFC_INITIALIZING)
5498 		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
5499 }
5500 
5501 /**
5502  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5503  * @tgt:		ibmvfc target struct
5504  *
5505  **/
ibmvfc_tgt_add_rport(struct ibmvfc_target * tgt)5506 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5507 {
5508 	struct ibmvfc_host *vhost = tgt->vhost;
5509 	struct fc_rport *rport;
5510 	unsigned long flags;
5511 
5512 	tgt_dbg(tgt, "Adding rport\n");
5513 	rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
5514 	spin_lock_irqsave(vhost->host->host_lock, flags);
5515 
5516 	if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5517 		tgt_dbg(tgt, "Deleting rport\n");
5518 		list_del(&tgt->queue);
5519 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5520 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5521 		fc_remote_port_delete(rport);
5522 		del_timer_sync(&tgt->timer);
5523 		kref_put(&tgt->kref, ibmvfc_release_tgt);
5524 		return;
5525 	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5526 		tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5527 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5528 		tgt->rport = NULL;
5529 		tgt->init_retries = 0;
5530 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5531 		fc_remote_port_delete(rport);
5532 		return;
5533 	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5534 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5535 		return;
5536 	}
5537 
5538 	if (rport) {
5539 		tgt_dbg(tgt, "rport add succeeded\n");
5540 		tgt->rport = rport;
5541 		rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5542 		rport->supported_classes = 0;
5543 		tgt->target_id = rport->scsi_target_id;
5544 		if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5545 			rport->supported_classes |= FC_COS_CLASS1;
5546 		if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5547 			rport->supported_classes |= FC_COS_CLASS2;
5548 		if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5549 			rport->supported_classes |= FC_COS_CLASS3;
5550 	} else
5551 		tgt_dbg(tgt, "rport add failed\n");
5552 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5553 }
5554 
5555 /**
5556  * ibmvfc_do_work - Do task level work
5557  * @vhost:		ibmvfc host struct
5558  *
5559  **/
ibmvfc_do_work(struct ibmvfc_host * vhost)5560 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5561 {
5562 	struct ibmvfc_target *tgt;
5563 	unsigned long flags;
5564 	struct fc_rport *rport;
5565 	LIST_HEAD(purge);
5566 	int rc;
5567 
5568 	ibmvfc_log_ae(vhost, vhost->events_to_log);
5569 	spin_lock_irqsave(vhost->host->host_lock, flags);
5570 	vhost->events_to_log = 0;
5571 	switch (vhost->action) {
5572 	case IBMVFC_HOST_ACTION_NONE:
5573 	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5574 	case IBMVFC_HOST_ACTION_INIT_WAIT:
5575 		break;
5576 	case IBMVFC_HOST_ACTION_RESET:
5577 		list_splice_init(&vhost->purge, &purge);
5578 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5579 		ibmvfc_complete_purge(&purge);
5580 		rc = ibmvfc_reset_crq(vhost);
5581 
5582 		spin_lock_irqsave(vhost->host->host_lock, flags);
5583 		if (!rc || rc == H_CLOSED)
5584 			vio_enable_interrupts(to_vio_dev(vhost->dev));
5585 		if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5586 			/*
5587 			 * The only action we could have changed to would have
5588 			 * been reenable, in which case, we skip the rest of
5589 			 * this path and wait until we've done the re-enable
5590 			 * before sending the crq init.
5591 			 */
5592 			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5593 
5594 			if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5595 			    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5596 				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5597 				dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5598 			}
5599 		}
5600 		break;
5601 	case IBMVFC_HOST_ACTION_REENABLE:
5602 		list_splice_init(&vhost->purge, &purge);
5603 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5604 		ibmvfc_complete_purge(&purge);
5605 		rc = ibmvfc_reenable_crq_queue(vhost);
5606 
5607 		spin_lock_irqsave(vhost->host->host_lock, flags);
5608 		if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5609 			/*
5610 			 * The only action we could have changed to would have
5611 			 * been reset, in which case, we skip the rest of this
5612 			 * path and wait until we've done the reset before
5613 			 * sending the crq init.
5614 			 */
5615 			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5616 			if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5617 				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5618 				dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5619 			}
5620 		}
5621 		break;
5622 	case IBMVFC_HOST_ACTION_LOGO:
5623 		vhost->job_step(vhost);
5624 		break;
5625 	case IBMVFC_HOST_ACTION_INIT:
5626 		BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5627 		if (vhost->delay_init) {
5628 			vhost->delay_init = 0;
5629 			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5630 			ssleep(15);
5631 			return;
5632 		} else
5633 			vhost->job_step(vhost);
5634 		break;
5635 	case IBMVFC_HOST_ACTION_QUERY:
5636 		list_for_each_entry(tgt, &vhost->targets, queue)
5637 			ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
5638 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
5639 		break;
5640 	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5641 		list_for_each_entry(tgt, &vhost->targets, queue) {
5642 			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5643 				tgt->job_step(tgt);
5644 				break;
5645 			}
5646 		}
5647 
5648 		if (!ibmvfc_dev_init_to_do(vhost))
5649 			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
5650 		break;
5651 	case IBMVFC_HOST_ACTION_TGT_DEL:
5652 	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5653 		list_for_each_entry(tgt, &vhost->targets, queue) {
5654 			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5655 				tgt->job_step(tgt);
5656 				break;
5657 			}
5658 		}
5659 
5660 		if (ibmvfc_dev_logo_to_do(vhost)) {
5661 			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5662 			return;
5663 		}
5664 
5665 		list_for_each_entry(tgt, &vhost->targets, queue) {
5666 			if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5667 				tgt_dbg(tgt, "Deleting rport\n");
5668 				rport = tgt->rport;
5669 				tgt->rport = NULL;
5670 				list_del(&tgt->queue);
5671 				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5672 				spin_unlock_irqrestore(vhost->host->host_lock, flags);
5673 				if (rport)
5674 					fc_remote_port_delete(rport);
5675 				del_timer_sync(&tgt->timer);
5676 				kref_put(&tgt->kref, ibmvfc_release_tgt);
5677 				return;
5678 			} else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5679 				tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5680 				rport = tgt->rport;
5681 				tgt->rport = NULL;
5682 				tgt->init_retries = 0;
5683 				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5684 
5685 				/*
5686 				 * If fast fail is enabled, we wait for it to fire and then clean up
5687 				 * the old port, since we expect the fast fail timer to clean up the
5688 				 * outstanding I/O faster than waiting for normal command timeouts.
5689 				 * However, if fast fail is disabled, any I/O outstanding to the
5690 				 * rport LUNs will stay outstanding indefinitely, since the EH handlers
5691 				 * won't get invoked for I/O's timing out. If this is a NPIV failover
5692 				 * scenario, the better alternative is to use the move login.
5693 				 */
5694 				if (rport && rport->fast_io_fail_tmo == -1)
5695 					tgt->move_login = 1;
5696 				spin_unlock_irqrestore(vhost->host->host_lock, flags);
5697 				if (rport)
5698 					fc_remote_port_delete(rport);
5699 				return;
5700 			}
5701 		}
5702 
5703 		if (vhost->state == IBMVFC_INITIALIZING) {
5704 			if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5705 				if (vhost->reinit) {
5706 					vhost->reinit = 0;
5707 					scsi_block_requests(vhost->host);
5708 					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5709 					spin_unlock_irqrestore(vhost->host->host_lock, flags);
5710 				} else {
5711 					ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
5712 					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5713 					wake_up(&vhost->init_wait_q);
5714 					schedule_work(&vhost->rport_add_work_q);
5715 					vhost->init_retries = 0;
5716 					spin_unlock_irqrestore(vhost->host->host_lock, flags);
5717 					scsi_unblock_requests(vhost->host);
5718 				}
5719 
5720 				return;
5721 			} else {
5722 				ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
5723 				vhost->job_step = ibmvfc_discover_targets;
5724 			}
5725 		} else {
5726 			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5727 			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5728 			scsi_unblock_requests(vhost->host);
5729 			wake_up(&vhost->init_wait_q);
5730 			return;
5731 		}
5732 		break;
5733 	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5734 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
5735 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5736 		ibmvfc_alloc_targets(vhost);
5737 		spin_lock_irqsave(vhost->host->host_lock, flags);
5738 		break;
5739 	case IBMVFC_HOST_ACTION_TGT_INIT:
5740 		list_for_each_entry(tgt, &vhost->targets, queue) {
5741 			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5742 				tgt->job_step(tgt);
5743 				break;
5744 			}
5745 		}
5746 
5747 		if (!ibmvfc_dev_init_to_do(vhost))
5748 			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5749 		break;
5750 	default:
5751 		break;
5752 	}
5753 
5754 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5755 }
5756 
5757 /**
5758  * ibmvfc_work - Do task level work
5759  * @data:		ibmvfc host struct
5760  *
5761  * Returns:
5762  *	zero
5763  **/
ibmvfc_work(void * data)5764 static int ibmvfc_work(void *data)
5765 {
5766 	struct ibmvfc_host *vhost = data;
5767 	int rc;
5768 
5769 	set_user_nice(current, MIN_NICE);
5770 
5771 	while (1) {
5772 		rc = wait_event_interruptible(vhost->work_wait_q,
5773 					      ibmvfc_work_to_do(vhost));
5774 
5775 		BUG_ON(rc);
5776 
5777 		if (kthread_should_stop())
5778 			break;
5779 
5780 		ibmvfc_do_work(vhost);
5781 	}
5782 
5783 	ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5784 	return 0;
5785 }
5786 
5787 /**
5788  * ibmvfc_alloc_queue - Allocate queue
5789  * @vhost:	ibmvfc host struct
5790  * @queue:	ibmvfc queue to allocate
5791  * @fmt:	queue format to allocate
5792  *
5793  * Returns:
5794  *	0 on success / non-zero on failure
5795  **/
ibmvfc_alloc_queue(struct ibmvfc_host * vhost,struct ibmvfc_queue * queue,enum ibmvfc_msg_fmt fmt)5796 static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5797 			      struct ibmvfc_queue *queue,
5798 			      enum ibmvfc_msg_fmt fmt)
5799 {
5800 	struct device *dev = vhost->dev;
5801 	size_t fmt_size;
5802 
5803 	ENTER;
5804 	spin_lock_init(&queue->_lock);
5805 	queue->q_lock = &queue->_lock;
5806 
5807 	switch (fmt) {
5808 	case IBMVFC_CRQ_FMT:
5809 		fmt_size = sizeof(*queue->msgs.crq);
5810 		queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
5811 		queue->evt_depth = scsi_qdepth;
5812 		queue->reserved_depth = IBMVFC_NUM_INTERNAL_REQ;
5813 		break;
5814 	case IBMVFC_ASYNC_FMT:
5815 		fmt_size = sizeof(*queue->msgs.async);
5816 		break;
5817 	case IBMVFC_SUB_CRQ_FMT:
5818 		fmt_size = sizeof(*queue->msgs.scrq);
5819 		/* We need one extra event for Cancel Commands */
5820 		queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5821 		queue->evt_depth = scsi_qdepth;
5822 		queue->reserved_depth = IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5823 		break;
5824 	default:
5825 		dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5826 		return -EINVAL;
5827 	}
5828 
5829 	queue->fmt = fmt;
5830 	if (ibmvfc_init_event_pool(vhost, queue)) {
5831 		dev_err(dev, "Couldn't initialize event pool.\n");
5832 		return -ENOMEM;
5833 	}
5834 
5835 	queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5836 	if (!queue->msgs.handle)
5837 		return -ENOMEM;
5838 
5839 	queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5840 					  DMA_BIDIRECTIONAL);
5841 
5842 	if (dma_mapping_error(dev, queue->msg_token)) {
5843 		free_page((unsigned long)queue->msgs.handle);
5844 		queue->msgs.handle = NULL;
5845 		return -ENOMEM;
5846 	}
5847 
5848 	queue->cur = 0;
5849 	queue->size = PAGE_SIZE / fmt_size;
5850 
5851 	queue->vhost = vhost;
5852 	return 0;
5853 }
5854 
5855 /**
5856  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5857  * @vhost:	ibmvfc host struct
5858  *
5859  * Allocates a page for messages, maps it for dma, and registers
5860  * the crq with the hypervisor.
5861  *
5862  * Return value:
5863  *	zero on success / other on failure
5864  **/
ibmvfc_init_crq(struct ibmvfc_host * vhost)5865 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5866 {
5867 	int rc, retrc = -ENOMEM;
5868 	struct device *dev = vhost->dev;
5869 	struct vio_dev *vdev = to_vio_dev(dev);
5870 	struct ibmvfc_queue *crq = &vhost->crq;
5871 
5872 	ENTER;
5873 	if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT))
5874 		return -ENOMEM;
5875 
5876 	retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5877 					crq->msg_token, PAGE_SIZE);
5878 
5879 	if (rc == H_RESOURCE)
5880 		/* maybe kexecing and resource is busy. try a reset */
5881 		retrc = rc = ibmvfc_reset_crq(vhost);
5882 
5883 	if (rc == H_CLOSED)
5884 		dev_warn(dev, "Partner adapter not ready\n");
5885 	else if (rc) {
5886 		dev_warn(dev, "Error %d opening adapter\n", rc);
5887 		goto reg_crq_failed;
5888 	}
5889 
5890 	retrc = 0;
5891 
5892 	tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
5893 
5894 	if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
5895 		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5896 		goto req_irq_failed;
5897 	}
5898 
5899 	if ((rc = vio_enable_interrupts(vdev))) {
5900 		dev_err(dev, "Error %d enabling interrupts\n", rc);
5901 		goto req_irq_failed;
5902 	}
5903 
5904 	LEAVE;
5905 	return retrc;
5906 
5907 req_irq_failed:
5908 	tasklet_kill(&vhost->tasklet);
5909 	do {
5910 		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5911 	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5912 reg_crq_failed:
5913 	ibmvfc_free_queue(vhost, crq);
5914 	return retrc;
5915 }
5916 
ibmvfc_register_channel(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels,int index)5917 static int ibmvfc_register_channel(struct ibmvfc_host *vhost,
5918 				   struct ibmvfc_channels *channels,
5919 				   int index)
5920 {
5921 	struct device *dev = vhost->dev;
5922 	struct vio_dev *vdev = to_vio_dev(dev);
5923 	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5924 	int rc = -ENOMEM;
5925 
5926 	ENTER;
5927 
5928 	rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
5929 			   &scrq->cookie, &scrq->hw_irq);
5930 
5931 	/* H_CLOSED indicates successful register, but no CRQ partner */
5932 	if (rc && rc != H_CLOSED) {
5933 		dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5934 		if (rc == H_PARAMETER)
5935 			dev_warn_once(dev, "Firmware may not support MQ\n");
5936 		goto reg_failed;
5937 	}
5938 
5939 	scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
5940 
5941 	if (!scrq->irq) {
5942 		rc = -EINVAL;
5943 		dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5944 		goto irq_failed;
5945 	}
5946 
5947 	switch (channels->protocol) {
5948 	case IBMVFC_PROTO_SCSI:
5949 		snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d",
5950 			 vdev->unit_address, index);
5951 		scrq->handler = ibmvfc_interrupt_mq;
5952 		break;
5953 	case IBMVFC_PROTO_NVME:
5954 		snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d",
5955 			 vdev->unit_address, index);
5956 		scrq->handler = ibmvfc_interrupt_mq;
5957 		break;
5958 	default:
5959 		dev_err(dev, "Unknown channel protocol (%d)\n",
5960 			channels->protocol);
5961 		goto irq_failed;
5962 	}
5963 
5964 	rc = request_irq(scrq->irq, scrq->handler, 0, scrq->name, scrq);
5965 
5966 	if (rc) {
5967 		dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5968 		irq_dispose_mapping(scrq->irq);
5969 		goto irq_failed;
5970 	}
5971 
5972 	scrq->hwq_id = index;
5973 
5974 	LEAVE;
5975 	return 0;
5976 
5977 irq_failed:
5978 	do {
5979 		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5980 	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5981 reg_failed:
5982 	LEAVE;
5983 	return rc;
5984 }
5985 
ibmvfc_deregister_channel(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels,int index)5986 static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost,
5987 				      struct ibmvfc_channels *channels,
5988 				      int index)
5989 {
5990 	struct device *dev = vhost->dev;
5991 	struct vio_dev *vdev = to_vio_dev(dev);
5992 	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5993 	long rc;
5994 
5995 	ENTER;
5996 
5997 	free_irq(scrq->irq, scrq);
5998 	irq_dispose_mapping(scrq->irq);
5999 	scrq->irq = 0;
6000 
6001 	do {
6002 		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
6003 					scrq->cookie);
6004 	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6005 
6006 	if (rc)
6007 		dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
6008 
6009 	/* Clean out the queue */
6010 	memset(scrq->msgs.crq, 0, PAGE_SIZE);
6011 	scrq->cur = 0;
6012 
6013 	LEAVE;
6014 }
6015 
ibmvfc_reg_sub_crqs(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6016 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost,
6017 				struct ibmvfc_channels *channels)
6018 {
6019 	int i, j;
6020 
6021 	ENTER;
6022 	if (!vhost->mq_enabled || !channels->scrqs)
6023 		return;
6024 
6025 	for (i = 0; i < channels->max_queues; i++) {
6026 		if (ibmvfc_register_channel(vhost, channels, i)) {
6027 			for (j = i; j > 0; j--)
6028 				ibmvfc_deregister_channel(vhost, channels, j - 1);
6029 			vhost->do_enquiry = 0;
6030 			return;
6031 		}
6032 	}
6033 
6034 	LEAVE;
6035 }
6036 
ibmvfc_dereg_sub_crqs(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6037 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost,
6038 				  struct ibmvfc_channels *channels)
6039 {
6040 	int i;
6041 
6042 	ENTER;
6043 	if (!vhost->mq_enabled || !channels->scrqs)
6044 		return;
6045 
6046 	for (i = 0; i < channels->max_queues; i++)
6047 		ibmvfc_deregister_channel(vhost, channels, i);
6048 
6049 	LEAVE;
6050 }
6051 
ibmvfc_alloc_channels(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6052 static int ibmvfc_alloc_channels(struct ibmvfc_host *vhost,
6053 				 struct ibmvfc_channels *channels)
6054 {
6055 	struct ibmvfc_queue *scrq;
6056 	int i, j;
6057 	int rc = 0;
6058 
6059 	channels->scrqs = kcalloc(channels->max_queues,
6060 				  sizeof(*channels->scrqs),
6061 				  GFP_KERNEL);
6062 	if (!channels->scrqs)
6063 		return -ENOMEM;
6064 
6065 	for (i = 0; i < channels->max_queues; i++) {
6066 		scrq = &channels->scrqs[i];
6067 		rc = ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT);
6068 		if (rc) {
6069 			for (j = i; j > 0; j--) {
6070 				scrq = &channels->scrqs[j - 1];
6071 				ibmvfc_free_queue(vhost, scrq);
6072 			}
6073 			kfree(channels->scrqs);
6074 			channels->scrqs = NULL;
6075 			channels->active_queues = 0;
6076 			return rc;
6077 		}
6078 	}
6079 
6080 	return rc;
6081 }
6082 
ibmvfc_init_sub_crqs(struct ibmvfc_host * vhost)6083 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
6084 {
6085 	ENTER;
6086 	if (!vhost->mq_enabled)
6087 		return;
6088 
6089 	if (ibmvfc_alloc_channels(vhost, &vhost->scsi_scrqs)) {
6090 		vhost->do_enquiry = 0;
6091 		vhost->mq_enabled = 0;
6092 		return;
6093 	}
6094 
6095 	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
6096 
6097 	LEAVE;
6098 }
6099 
ibmvfc_release_channels(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6100 static void ibmvfc_release_channels(struct ibmvfc_host *vhost,
6101 				    struct ibmvfc_channels *channels)
6102 {
6103 	struct ibmvfc_queue *scrq;
6104 	int i;
6105 
6106 	if (channels->scrqs) {
6107 		for (i = 0; i < channels->max_queues; i++) {
6108 			scrq = &channels->scrqs[i];
6109 			ibmvfc_free_queue(vhost, scrq);
6110 		}
6111 
6112 		kfree(channels->scrqs);
6113 		channels->scrqs = NULL;
6114 		channels->active_queues = 0;
6115 	}
6116 }
6117 
ibmvfc_release_sub_crqs(struct ibmvfc_host * vhost)6118 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
6119 {
6120 	ENTER;
6121 	if (!vhost->scsi_scrqs.scrqs)
6122 		return;
6123 
6124 	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
6125 
6126 	ibmvfc_release_channels(vhost, &vhost->scsi_scrqs);
6127 	LEAVE;
6128 }
6129 
ibmvfc_free_disc_buf(struct device * dev,struct ibmvfc_channels * channels)6130 static void ibmvfc_free_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6131 {
6132 	dma_free_coherent(dev, channels->disc_buf_sz, channels->disc_buf,
6133 			  channels->disc_buf_dma);
6134 }
6135 
6136 /**
6137  * ibmvfc_free_mem - Free memory for vhost
6138  * @vhost:	ibmvfc host struct
6139  *
6140  * Return value:
6141  * 	none
6142  **/
ibmvfc_free_mem(struct ibmvfc_host * vhost)6143 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
6144 {
6145 	struct ibmvfc_queue *async_q = &vhost->async_crq;
6146 
6147 	ENTER;
6148 	mempool_destroy(vhost->tgt_pool);
6149 	kfree(vhost->trace);
6150 	ibmvfc_free_disc_buf(vhost->dev, &vhost->scsi_scrqs);
6151 	dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
6152 			  vhost->login_buf, vhost->login_buf_dma);
6153 	dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
6154 			  vhost->channel_setup_buf, vhost->channel_setup_dma);
6155 	dma_pool_destroy(vhost->sg_pool);
6156 	ibmvfc_free_queue(vhost, async_q);
6157 	LEAVE;
6158 }
6159 
ibmvfc_alloc_disc_buf(struct device * dev,struct ibmvfc_channels * channels)6160 static int ibmvfc_alloc_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6161 {
6162 	channels->disc_buf_sz = sizeof(*channels->disc_buf) * max_targets;
6163 	channels->disc_buf = dma_alloc_coherent(dev, channels->disc_buf_sz,
6164 					     &channels->disc_buf_dma, GFP_KERNEL);
6165 
6166 	if (!channels->disc_buf) {
6167 		dev_err(dev, "Couldn't allocate %s Discover Targets buffer\n",
6168 			(channels->protocol == IBMVFC_PROTO_SCSI) ? "SCSI" : "NVMe");
6169 		return -ENOMEM;
6170 	}
6171 
6172 	return 0;
6173 }
6174 
6175 /**
6176  * ibmvfc_alloc_mem - Allocate memory for vhost
6177  * @vhost:	ibmvfc host struct
6178  *
6179  * Return value:
6180  * 	0 on success / non-zero on failure
6181  **/
ibmvfc_alloc_mem(struct ibmvfc_host * vhost)6182 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
6183 {
6184 	struct ibmvfc_queue *async_q = &vhost->async_crq;
6185 	struct device *dev = vhost->dev;
6186 
6187 	ENTER;
6188 	if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) {
6189 		dev_err(dev, "Couldn't allocate/map async queue.\n");
6190 		goto nomem;
6191 	}
6192 
6193 	vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
6194 					 SG_ALL * sizeof(struct srp_direct_buf),
6195 					 sizeof(struct srp_direct_buf), 0);
6196 
6197 	if (!vhost->sg_pool) {
6198 		dev_err(dev, "Failed to allocate sg pool\n");
6199 		goto unmap_async_crq;
6200 	}
6201 
6202 	vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
6203 					      &vhost->login_buf_dma, GFP_KERNEL);
6204 
6205 	if (!vhost->login_buf) {
6206 		dev_err(dev, "Couldn't allocate NPIV login buffer\n");
6207 		goto free_sg_pool;
6208 	}
6209 
6210 	if (ibmvfc_alloc_disc_buf(dev, &vhost->scsi_scrqs))
6211 		goto free_login_buffer;
6212 
6213 	vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
6214 			       sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
6215 	atomic_set(&vhost->trace_index, -1);
6216 
6217 	if (!vhost->trace)
6218 		goto free_scsi_disc_buffer;
6219 
6220 	vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6221 						      sizeof(struct ibmvfc_target));
6222 
6223 	if (!vhost->tgt_pool) {
6224 		dev_err(dev, "Couldn't allocate target memory pool\n");
6225 		goto free_trace;
6226 	}
6227 
6228 	vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf),
6229 						      &vhost->channel_setup_dma,
6230 						      GFP_KERNEL);
6231 
6232 	if (!vhost->channel_setup_buf) {
6233 		dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6234 		goto free_tgt_pool;
6235 	}
6236 
6237 	LEAVE;
6238 	return 0;
6239 
6240 free_tgt_pool:
6241 	mempool_destroy(vhost->tgt_pool);
6242 free_trace:
6243 	kfree(vhost->trace);
6244 free_scsi_disc_buffer:
6245 	ibmvfc_free_disc_buf(dev, &vhost->scsi_scrqs);
6246 free_login_buffer:
6247 	dma_free_coherent(dev, sizeof(*vhost->login_buf),
6248 			  vhost->login_buf, vhost->login_buf_dma);
6249 free_sg_pool:
6250 	dma_pool_destroy(vhost->sg_pool);
6251 unmap_async_crq:
6252 	ibmvfc_free_queue(vhost, async_q);
6253 nomem:
6254 	LEAVE;
6255 	return -ENOMEM;
6256 }
6257 
6258 /**
6259  * ibmvfc_rport_add_thread - Worker thread for rport adds
6260  * @work:	work struct
6261  *
6262  **/
ibmvfc_rport_add_thread(struct work_struct * work)6263 static void ibmvfc_rport_add_thread(struct work_struct *work)
6264 {
6265 	struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6266 						 rport_add_work_q);
6267 	struct ibmvfc_target *tgt;
6268 	struct fc_rport *rport;
6269 	unsigned long flags;
6270 	int did_work;
6271 
6272 	ENTER;
6273 	spin_lock_irqsave(vhost->host->host_lock, flags);
6274 	do {
6275 		did_work = 0;
6276 		if (vhost->state != IBMVFC_ACTIVE)
6277 			break;
6278 
6279 		list_for_each_entry(tgt, &vhost->targets, queue) {
6280 			if (tgt->add_rport) {
6281 				did_work = 1;
6282 				tgt->add_rport = 0;
6283 				kref_get(&tgt->kref);
6284 				rport = tgt->rport;
6285 				if (!rport) {
6286 					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6287 					ibmvfc_tgt_add_rport(tgt);
6288 				} else if (get_device(&rport->dev)) {
6289 					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6290 					tgt_dbg(tgt, "Setting rport roles\n");
6291 					fc_remote_port_rolechg(rport, tgt->ids.roles);
6292 					put_device(&rport->dev);
6293 				} else {
6294 					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6295 				}
6296 
6297 				kref_put(&tgt->kref, ibmvfc_release_tgt);
6298 				spin_lock_irqsave(vhost->host->host_lock, flags);
6299 				break;
6300 			}
6301 		}
6302 	} while(did_work);
6303 
6304 	if (vhost->state == IBMVFC_ACTIVE)
6305 		vhost->scan_complete = 1;
6306 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6307 	LEAVE;
6308 }
6309 
6310 /**
6311  * ibmvfc_probe - Adapter hot plug add entry point
6312  * @vdev:	vio device struct
6313  * @id:	vio device id struct
6314  *
6315  * Return value:
6316  * 	0 on success / non-zero on failure
6317  **/
ibmvfc_probe(struct vio_dev * vdev,const struct vio_device_id * id)6318 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6319 {
6320 	struct ibmvfc_host *vhost;
6321 	struct Scsi_Host *shost;
6322 	struct device *dev = &vdev->dev;
6323 	int rc = -ENOMEM;
6324 	unsigned int online_cpus = num_online_cpus();
6325 	unsigned int max_scsi_queues = min((unsigned int)IBMVFC_MAX_SCSI_QUEUES, online_cpus);
6326 
6327 	ENTER;
6328 	shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6329 	if (!shost) {
6330 		dev_err(dev, "Couldn't allocate host data\n");
6331 		goto out;
6332 	}
6333 
6334 	shost->transportt = ibmvfc_transport_template;
6335 	shost->can_queue = scsi_qdepth;
6336 	shost->max_lun = max_lun;
6337 	shost->max_id = max_targets;
6338 	shost->max_sectors = max_sectors;
6339 	shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6340 	shost->unique_id = shost->host_no;
6341 	shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6342 
6343 	vhost = shost_priv(shost);
6344 	INIT_LIST_HEAD(&vhost->targets);
6345 	INIT_LIST_HEAD(&vhost->purge);
6346 	sprintf(vhost->name, IBMVFC_NAME);
6347 	vhost->host = shost;
6348 	vhost->dev = dev;
6349 	vhost->partition_number = -1;
6350 	vhost->log_level = log_level;
6351 	vhost->task_set = 1;
6352 
6353 	vhost->mq_enabled = mq_enabled;
6354 	vhost->scsi_scrqs.desired_queues = min(shost->nr_hw_queues, nr_scsi_channels);
6355 	vhost->scsi_scrqs.max_queues = shost->nr_hw_queues;
6356 	vhost->scsi_scrqs.protocol = IBMVFC_PROTO_SCSI;
6357 	vhost->using_channels = 0;
6358 	vhost->do_enquiry = 1;
6359 	vhost->scan_timeout = 0;
6360 
6361 	strcpy(vhost->partition_name, "UNKNOWN");
6362 	init_waitqueue_head(&vhost->work_wait_q);
6363 	init_waitqueue_head(&vhost->init_wait_q);
6364 	INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6365 	mutex_init(&vhost->passthru_mutex);
6366 
6367 	if ((rc = ibmvfc_alloc_mem(vhost)))
6368 		goto free_scsi_host;
6369 
6370 	vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6371 					 shost->host_no);
6372 
6373 	if (IS_ERR(vhost->work_thread)) {
6374 		dev_err(dev, "Couldn't create kernel thread: %ld\n",
6375 			PTR_ERR(vhost->work_thread));
6376 		rc = PTR_ERR(vhost->work_thread);
6377 		goto free_host_mem;
6378 	}
6379 
6380 	if ((rc = ibmvfc_init_crq(vhost))) {
6381 		dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6382 		goto kill_kthread;
6383 	}
6384 
6385 	if ((rc = scsi_add_host(shost, dev)))
6386 		goto release_crq;
6387 
6388 	fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6389 
6390 	if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6391 					   &ibmvfc_trace_attr))) {
6392 		dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6393 		goto remove_shost;
6394 	}
6395 
6396 	ibmvfc_init_sub_crqs(vhost);
6397 
6398 	dev_set_drvdata(dev, vhost);
6399 	spin_lock(&ibmvfc_driver_lock);
6400 	list_add_tail(&vhost->queue, &ibmvfc_head);
6401 	spin_unlock(&ibmvfc_driver_lock);
6402 
6403 	ibmvfc_send_crq_init(vhost);
6404 	scsi_scan_host(shost);
6405 	return 0;
6406 
6407 remove_shost:
6408 	scsi_remove_host(shost);
6409 release_crq:
6410 	ibmvfc_release_crq_queue(vhost);
6411 kill_kthread:
6412 	kthread_stop(vhost->work_thread);
6413 free_host_mem:
6414 	ibmvfc_free_mem(vhost);
6415 free_scsi_host:
6416 	scsi_host_put(shost);
6417 out:
6418 	LEAVE;
6419 	return rc;
6420 }
6421 
6422 /**
6423  * ibmvfc_remove - Adapter hot plug remove entry point
6424  * @vdev:	vio device struct
6425  *
6426  * Return value:
6427  * 	0
6428  **/
ibmvfc_remove(struct vio_dev * vdev)6429 static void ibmvfc_remove(struct vio_dev *vdev)
6430 {
6431 	struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
6432 	LIST_HEAD(purge);
6433 	unsigned long flags;
6434 
6435 	ENTER;
6436 	ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6437 
6438 	spin_lock_irqsave(vhost->host->host_lock, flags);
6439 	ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
6440 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6441 
6442 	ibmvfc_wait_while_resetting(vhost);
6443 	kthread_stop(vhost->work_thread);
6444 	fc_remove_host(vhost->host);
6445 	scsi_remove_host(vhost->host);
6446 
6447 	spin_lock_irqsave(vhost->host->host_lock, flags);
6448 	ibmvfc_purge_requests(vhost, DID_ERROR);
6449 	list_splice_init(&vhost->purge, &purge);
6450 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6451 	ibmvfc_complete_purge(&purge);
6452 	ibmvfc_release_sub_crqs(vhost);
6453 	ibmvfc_release_crq_queue(vhost);
6454 
6455 	ibmvfc_free_mem(vhost);
6456 	spin_lock(&ibmvfc_driver_lock);
6457 	list_del(&vhost->queue);
6458 	spin_unlock(&ibmvfc_driver_lock);
6459 	scsi_host_put(vhost->host);
6460 	LEAVE;
6461 }
6462 
6463 /**
6464  * ibmvfc_resume - Resume from suspend
6465  * @dev:	device struct
6466  *
6467  * We may have lost an interrupt across suspend/resume, so kick the
6468  * interrupt handler
6469  *
6470  */
ibmvfc_resume(struct device * dev)6471 static int ibmvfc_resume(struct device *dev)
6472 {
6473 	unsigned long flags;
6474 	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6475 	struct vio_dev *vdev = to_vio_dev(dev);
6476 
6477 	spin_lock_irqsave(vhost->host->host_lock, flags);
6478 	vio_disable_interrupts(vdev);
6479 	tasklet_schedule(&vhost->tasklet);
6480 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6481 	return 0;
6482 }
6483 
6484 /**
6485  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6486  * @vdev:	vio device struct
6487  *
6488  * Return value:
6489  *	Number of bytes the driver will need to DMA map at the same time in
6490  *	order to perform well.
6491  */
ibmvfc_get_desired_dma(struct vio_dev * vdev)6492 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6493 {
6494 	unsigned long pool_dma;
6495 
6496 	pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu);
6497 	return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6498 }
6499 
6500 static const struct vio_device_id ibmvfc_device_table[] = {
6501 	{"fcp", "IBM,vfc-client"},
6502 	{ "", "" }
6503 };
6504 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6505 
6506 static const struct dev_pm_ops ibmvfc_pm_ops = {
6507 	.resume = ibmvfc_resume
6508 };
6509 
6510 static struct vio_driver ibmvfc_driver = {
6511 	.id_table = ibmvfc_device_table,
6512 	.probe = ibmvfc_probe,
6513 	.remove = ibmvfc_remove,
6514 	.get_desired_dma = ibmvfc_get_desired_dma,
6515 	.name = IBMVFC_NAME,
6516 	.pm = &ibmvfc_pm_ops,
6517 };
6518 
6519 static struct fc_function_template ibmvfc_transport_functions = {
6520 	.show_host_fabric_name = 1,
6521 	.show_host_node_name = 1,
6522 	.show_host_port_name = 1,
6523 	.show_host_supported_classes = 1,
6524 	.show_host_port_type = 1,
6525 	.show_host_port_id = 1,
6526 	.show_host_maxframe_size = 1,
6527 
6528 	.get_host_port_state = ibmvfc_get_host_port_state,
6529 	.show_host_port_state = 1,
6530 
6531 	.get_host_speed = ibmvfc_get_host_speed,
6532 	.show_host_speed = 1,
6533 
6534 	.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6535 	.terminate_rport_io = ibmvfc_terminate_rport_io,
6536 
6537 	.show_rport_maxframe_size = 1,
6538 	.show_rport_supported_classes = 1,
6539 
6540 	.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6541 	.show_rport_dev_loss_tmo = 1,
6542 
6543 	.get_starget_node_name = ibmvfc_get_starget_node_name,
6544 	.show_starget_node_name = 1,
6545 
6546 	.get_starget_port_name = ibmvfc_get_starget_port_name,
6547 	.show_starget_port_name = 1,
6548 
6549 	.get_starget_port_id = ibmvfc_get_starget_port_id,
6550 	.show_starget_port_id = 1,
6551 
6552 	.max_bsg_segments = 1,
6553 	.bsg_request = ibmvfc_bsg_request,
6554 	.bsg_timeout = ibmvfc_bsg_timeout,
6555 };
6556 
6557 /**
6558  * ibmvfc_module_init - Initialize the ibmvfc module
6559  *
6560  * Return value:
6561  * 	0 on success / other on failure
6562  **/
ibmvfc_module_init(void)6563 static int __init ibmvfc_module_init(void)
6564 {
6565 	int min_max_sectors = PAGE_SIZE >> 9;
6566 	int rc;
6567 
6568 	if (!firmware_has_feature(FW_FEATURE_VIO))
6569 		return -ENODEV;
6570 
6571 	printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6572 	       IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6573 
6574 	/*
6575 	 * Range check the max_sectors module parameter. The upper bounds is
6576 	 * implicity checked since the parameter is a ushort.
6577 	 */
6578 	if (max_sectors < min_max_sectors) {
6579 		printk(KERN_ERR IBMVFC_NAME ": max_sectors must be at least %d.\n",
6580 			min_max_sectors);
6581 		max_sectors = min_max_sectors;
6582 	}
6583 
6584 	ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6585 	if (!ibmvfc_transport_template)
6586 		return -ENOMEM;
6587 
6588 	rc = vio_register_driver(&ibmvfc_driver);
6589 	if (rc)
6590 		fc_release_transport(ibmvfc_transport_template);
6591 	return rc;
6592 }
6593 
6594 /**
6595  * ibmvfc_module_exit - Teardown the ibmvfc module
6596  *
6597  * Return value:
6598  * 	nothing
6599  **/
ibmvfc_module_exit(void)6600 static void __exit ibmvfc_module_exit(void)
6601 {
6602 	vio_unregister_driver(&ibmvfc_driver);
6603 	fc_release_transport(ibmvfc_transport_template);
6604 }
6605 
6606 module_init(ibmvfc_module_init);
6607 module_exit(ibmvfc_module_exit);
6608