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 = kzalloc_objs(*pool->events, pool->size);
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 timer_delete(&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 = timer_container_of(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 timer_delete(&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 enum scsi_qc_status ibmvfc_queuecommand(struct Scsi_Host *shost,
1964 struct scsi_cmnd *cmnd)
1965 {
1966 struct ibmvfc_host *vhost = shost_priv(shost);
1967 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1968 struct ibmvfc_cmd *vfc_cmd;
1969 struct ibmvfc_fcp_cmd_iu *iu;
1970 struct ibmvfc_event *evt;
1971 u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
1972 u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1973 u16 scsi_channel;
1974 int rc;
1975
1976 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1977 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1978 cmnd->result = rc;
1979 scsi_done(cmnd);
1980 return 0;
1981 }
1982
1983 cmnd->result = (DID_OK << 16);
1984 if (vhost->using_channels) {
1985 scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1986 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1987 if (!evt)
1988 return SCSI_MLQUEUE_HOST_BUSY;
1989
1990 evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1991 } else {
1992 evt = ibmvfc_get_event(&vhost->crq);
1993 if (!evt)
1994 return SCSI_MLQUEUE_HOST_BUSY;
1995 }
1996
1997 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1998 evt->cmnd = cmnd;
1999
2000 vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
2001 iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
2002
2003 iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
2004 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
2005
2006 if (cmnd->flags & SCMD_TAGGED) {
2007 vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
2008 iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
2009 }
2010
2011 vfc_cmd->correlation = cpu_to_be64((u64)evt);
2012
2013 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
2014 return ibmvfc_send_event(evt, vhost, 0);
2015
2016 ibmvfc_free_event(evt);
2017 if (rc == -ENOMEM)
2018 return SCSI_MLQUEUE_HOST_BUSY;
2019
2020 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2021 scmd_printk(KERN_ERR, cmnd,
2022 "Failed to map DMA buffer for command. rc=%d\n", rc);
2023
2024 cmnd->result = DID_ERROR << 16;
2025 scsi_done(cmnd);
2026 return 0;
2027 }
2028
2029 /**
2030 * ibmvfc_sync_completion - Signal that a synchronous command has completed
2031 * @evt: ibmvfc event struct
2032 *
2033 **/
ibmvfc_sync_completion(struct ibmvfc_event * evt)2034 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
2035 {
2036 /* copy the response back */
2037 if (evt->sync_iu)
2038 *evt->sync_iu = *evt->xfer_iu;
2039
2040 complete(&evt->comp);
2041 }
2042
2043 /**
2044 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
2045 * @evt: struct ibmvfc_event
2046 *
2047 **/
ibmvfc_bsg_timeout_done(struct ibmvfc_event * evt)2048 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2049 {
2050 struct ibmvfc_host *vhost = evt->vhost;
2051
2052 ibmvfc_free_event(evt);
2053 vhost->aborting_passthru = 0;
2054 dev_info(vhost->dev, "Passthru command cancelled\n");
2055 }
2056
2057 /**
2058 * ibmvfc_bsg_timeout - Handle a BSG timeout
2059 * @job: struct bsg_job that timed out
2060 *
2061 * Returns:
2062 * 0 on success / other on failure
2063 **/
ibmvfc_bsg_timeout(struct bsg_job * job)2064 static int ibmvfc_bsg_timeout(struct bsg_job *job)
2065 {
2066 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2067 unsigned long port_id = (unsigned long)job->dd_data;
2068 struct ibmvfc_event *evt;
2069 struct ibmvfc_tmf *tmf;
2070 unsigned long flags;
2071 int rc;
2072
2073 ENTER;
2074 spin_lock_irqsave(vhost->host->host_lock, flags);
2075 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2076 __ibmvfc_reset_host(vhost);
2077 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2078 return 0;
2079 }
2080
2081 vhost->aborting_passthru = 1;
2082 evt = ibmvfc_get_reserved_event(&vhost->crq);
2083 if (!evt) {
2084 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2085 return -ENOMEM;
2086 }
2087
2088 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2089
2090 tmf = &evt->iu.tmf;
2091 memset(tmf, 0, sizeof(*tmf));
2092 tmf->common.version = cpu_to_be32(1);
2093 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2094 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2095 tmf->scsi_id = cpu_to_be64(port_id);
2096 tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2097 tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2098 rc = ibmvfc_send_event(evt, vhost, default_timeout);
2099
2100 if (rc != 0) {
2101 vhost->aborting_passthru = 0;
2102 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2103 rc = -EIO;
2104 } else
2105 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2106 port_id);
2107
2108 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2109
2110 LEAVE;
2111 return rc;
2112 }
2113
2114 /**
2115 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2116 * @vhost: struct ibmvfc_host to send command
2117 * @port_id: port ID to send command
2118 *
2119 * Returns:
2120 * 0 on success / other on failure
2121 **/
ibmvfc_bsg_plogi(struct ibmvfc_host * vhost,unsigned int port_id)2122 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2123 {
2124 struct ibmvfc_port_login *plogi;
2125 struct ibmvfc_target *tgt;
2126 struct ibmvfc_event *evt;
2127 union ibmvfc_iu rsp_iu;
2128 unsigned long flags;
2129 int rc = 0, issue_login = 1;
2130
2131 ENTER;
2132 spin_lock_irqsave(vhost->host->host_lock, flags);
2133 list_for_each_entry(tgt, &vhost->targets, queue) {
2134 if (tgt->scsi_id == port_id) {
2135 issue_login = 0;
2136 break;
2137 }
2138 }
2139
2140 if (!issue_login)
2141 goto unlock_out;
2142 if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2143 goto unlock_out;
2144
2145 evt = ibmvfc_get_reserved_event(&vhost->crq);
2146 if (!evt) {
2147 rc = -ENOMEM;
2148 goto unlock_out;
2149 }
2150 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2151 plogi = &evt->iu.plogi;
2152 memset(plogi, 0, sizeof(*plogi));
2153 plogi->common.version = cpu_to_be32(1);
2154 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2155 plogi->common.length = cpu_to_be16(sizeof(*plogi));
2156 plogi->scsi_id = cpu_to_be64(port_id);
2157 evt->sync_iu = &rsp_iu;
2158 init_completion(&evt->comp);
2159
2160 rc = ibmvfc_send_event(evt, vhost, default_timeout);
2161 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2162
2163 if (rc)
2164 return -EIO;
2165
2166 wait_for_completion(&evt->comp);
2167
2168 if (rsp_iu.plogi.common.status)
2169 rc = -EIO;
2170
2171 spin_lock_irqsave(vhost->host->host_lock, flags);
2172 ibmvfc_free_event(evt);
2173 unlock_out:
2174 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2175 LEAVE;
2176 return rc;
2177 }
2178
2179 /**
2180 * ibmvfc_bsg_request - Handle a BSG request
2181 * @job: struct bsg_job to be executed
2182 *
2183 * Returns:
2184 * 0 on success / other on failure
2185 **/
ibmvfc_bsg_request(struct bsg_job * job)2186 static int ibmvfc_bsg_request(struct bsg_job *job)
2187 {
2188 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2189 struct fc_rport *rport = fc_bsg_to_rport(job);
2190 struct ibmvfc_passthru_mad *mad;
2191 struct ibmvfc_event *evt;
2192 union ibmvfc_iu rsp_iu;
2193 unsigned long flags, port_id = -1;
2194 struct fc_bsg_request *bsg_request = job->request;
2195 struct fc_bsg_reply *bsg_reply = job->reply;
2196 unsigned int code = bsg_request->msgcode;
2197 int rc = 0, req_seg, rsp_seg, issue_login = 0;
2198 u32 fc_flags, rsp_len;
2199
2200 ENTER;
2201 bsg_reply->reply_payload_rcv_len = 0;
2202 if (rport)
2203 port_id = rport->port_id;
2204
2205 switch (code) {
2206 case FC_BSG_HST_ELS_NOLOGIN:
2207 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2208 (bsg_request->rqst_data.h_els.port_id[1] << 8) |
2209 bsg_request->rqst_data.h_els.port_id[2];
2210 fallthrough;
2211 case FC_BSG_RPT_ELS:
2212 fc_flags = IBMVFC_FC_ELS;
2213 break;
2214 case FC_BSG_HST_CT:
2215 issue_login = 1;
2216 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2217 (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2218 bsg_request->rqst_data.h_ct.port_id[2];
2219 fallthrough;
2220 case FC_BSG_RPT_CT:
2221 fc_flags = IBMVFC_FC_CT_IU;
2222 break;
2223 default:
2224 return -ENOTSUPP;
2225 }
2226
2227 if (port_id == -1)
2228 return -EINVAL;
2229 if (!mutex_trylock(&vhost->passthru_mutex))
2230 return -EBUSY;
2231
2232 job->dd_data = (void *)port_id;
2233 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2234 job->request_payload.sg_cnt, DMA_TO_DEVICE);
2235
2236 if (!req_seg) {
2237 mutex_unlock(&vhost->passthru_mutex);
2238 return -ENOMEM;
2239 }
2240
2241 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2242 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2243
2244 if (!rsp_seg) {
2245 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2246 job->request_payload.sg_cnt, DMA_TO_DEVICE);
2247 mutex_unlock(&vhost->passthru_mutex);
2248 return -ENOMEM;
2249 }
2250
2251 if (req_seg > 1 || rsp_seg > 1) {
2252 rc = -EINVAL;
2253 goto out;
2254 }
2255
2256 if (issue_login)
2257 rc = ibmvfc_bsg_plogi(vhost, port_id);
2258
2259 spin_lock_irqsave(vhost->host->host_lock, flags);
2260
2261 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2262 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2263 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2264 goto out;
2265 }
2266
2267 evt = ibmvfc_get_reserved_event(&vhost->crq);
2268 if (!evt) {
2269 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2270 rc = -ENOMEM;
2271 goto out;
2272 }
2273 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2274 mad = &evt->iu.passthru;
2275
2276 memset(mad, 0, sizeof(*mad));
2277 mad->common.version = cpu_to_be32(1);
2278 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2279 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2280
2281 mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2282 offsetof(struct ibmvfc_passthru_mad, iu));
2283 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2284
2285 mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2286 mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2287 mad->iu.flags = cpu_to_be32(fc_flags);
2288 mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2289
2290 mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2291 mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2292 mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2293 mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2294 mad->iu.scsi_id = cpu_to_be64(port_id);
2295 mad->iu.tag = cpu_to_be64((u64)evt);
2296 rsp_len = be32_to_cpu(mad->iu.rsp.len);
2297
2298 evt->sync_iu = &rsp_iu;
2299 init_completion(&evt->comp);
2300 rc = ibmvfc_send_event(evt, vhost, 0);
2301 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2302
2303 if (rc) {
2304 rc = -EIO;
2305 goto out;
2306 }
2307
2308 wait_for_completion(&evt->comp);
2309
2310 if (rsp_iu.passthru.common.status)
2311 rc = -EIO;
2312 else
2313 bsg_reply->reply_payload_rcv_len = rsp_len;
2314
2315 spin_lock_irqsave(vhost->host->host_lock, flags);
2316 ibmvfc_free_event(evt);
2317 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2318 bsg_reply->result = rc;
2319 bsg_job_done(job, bsg_reply->result,
2320 bsg_reply->reply_payload_rcv_len);
2321 rc = 0;
2322 out:
2323 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2324 job->request_payload.sg_cnt, DMA_TO_DEVICE);
2325 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2326 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2327 mutex_unlock(&vhost->passthru_mutex);
2328 LEAVE;
2329 return rc;
2330 }
2331
2332 /**
2333 * ibmvfc_reset_device - Reset the device with the specified reset type
2334 * @sdev: scsi device to reset
2335 * @type: reset type
2336 * @desc: reset type description for log messages
2337 *
2338 * Returns:
2339 * 0 on success / other on failure
2340 **/
ibmvfc_reset_device(struct scsi_device * sdev,int type,char * desc)2341 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2342 {
2343 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2344 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2345 struct ibmvfc_cmd *tmf;
2346 struct ibmvfc_event *evt = NULL;
2347 union ibmvfc_iu rsp_iu;
2348 struct ibmvfc_fcp_cmd_iu *iu;
2349 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2350 int rsp_rc = -EBUSY;
2351 unsigned long flags;
2352 int rsp_code = 0;
2353
2354 spin_lock_irqsave(vhost->host->host_lock, flags);
2355 if (vhost->state == IBMVFC_ACTIVE) {
2356 if (vhost->using_channels)
2357 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2358 else
2359 evt = ibmvfc_get_event(&vhost->crq);
2360
2361 if (!evt) {
2362 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2363 return -ENOMEM;
2364 }
2365
2366 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2367 tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2368 iu = ibmvfc_get_fcp_iu(vhost, tmf);
2369
2370 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2371 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2372 tmf->target_wwpn = cpu_to_be64(rport->port_name);
2373 iu->tmf_flags = type;
2374 evt->sync_iu = &rsp_iu;
2375
2376 init_completion(&evt->comp);
2377 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2378 }
2379 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2380
2381 if (rsp_rc != 0) {
2382 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2383 desc, rsp_rc);
2384 return -EIO;
2385 }
2386
2387 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2388 wait_for_completion(&evt->comp);
2389
2390 if (rsp_iu.cmd.status)
2391 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2392
2393 if (rsp_code) {
2394 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2395 rsp_code = fc_rsp->data.info.rsp_code;
2396
2397 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2398 "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2399 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2400 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2401 fc_rsp->scsi_status);
2402 rsp_rc = -EIO;
2403 } else
2404 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2405
2406 spin_lock_irqsave(vhost->host->host_lock, flags);
2407 ibmvfc_free_event(evt);
2408 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2409 return rsp_rc;
2410 }
2411
2412 /**
2413 * ibmvfc_match_rport - Match function for specified remote port
2414 * @evt: ibmvfc event struct
2415 * @rport: device to match
2416 *
2417 * Returns:
2418 * 1 if event matches rport / 0 if event does not match rport
2419 **/
ibmvfc_match_rport(struct ibmvfc_event * evt,void * rport)2420 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2421 {
2422 struct fc_rport *cmd_rport;
2423
2424 if (evt->cmnd) {
2425 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2426 if (cmd_rport == rport)
2427 return 1;
2428 }
2429 return 0;
2430 }
2431
2432 /**
2433 * ibmvfc_match_target - Match function for specified target
2434 * @evt: ibmvfc event struct
2435 * @device: device to match (starget)
2436 *
2437 * Returns:
2438 * 1 if event matches starget / 0 if event does not match starget
2439 **/
ibmvfc_match_target(struct ibmvfc_event * evt,void * device)2440 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2441 {
2442 if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2443 return 1;
2444 return 0;
2445 }
2446
2447 /**
2448 * ibmvfc_match_lun - Match function for specified LUN
2449 * @evt: ibmvfc event struct
2450 * @device: device to match (sdev)
2451 *
2452 * Returns:
2453 * 1 if event matches sdev / 0 if event does not match sdev
2454 **/
ibmvfc_match_lun(struct ibmvfc_event * evt,void * device)2455 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2456 {
2457 if (evt->cmnd && evt->cmnd->device == device)
2458 return 1;
2459 return 0;
2460 }
2461
2462 /**
2463 * ibmvfc_event_is_free - Check if event is free or not
2464 * @evt: ibmvfc event struct
2465 *
2466 * Returns:
2467 * true / false
2468 **/
ibmvfc_event_is_free(struct ibmvfc_event * evt)2469 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2470 {
2471 struct ibmvfc_event *loop_evt;
2472
2473 list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2474 if (loop_evt == evt)
2475 return true;
2476
2477 return false;
2478 }
2479
2480 /**
2481 * ibmvfc_wait_for_ops - Wait for ops to complete
2482 * @vhost: ibmvfc host struct
2483 * @device: device to match (starget or sdev)
2484 * @match: match function
2485 *
2486 * Returns:
2487 * SUCCESS / FAILED
2488 **/
ibmvfc_wait_for_ops(struct ibmvfc_host * vhost,void * device,int (* match)(struct ibmvfc_event *,void *))2489 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2490 int (*match) (struct ibmvfc_event *, void *))
2491 {
2492 struct ibmvfc_event *evt;
2493 DECLARE_COMPLETION_ONSTACK(comp);
2494 int wait, i, q_index, q_size;
2495 unsigned long flags;
2496 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2497 struct ibmvfc_queue *queues;
2498
2499 ENTER;
2500 if (vhost->mq_enabled && vhost->using_channels) {
2501 queues = vhost->scsi_scrqs.scrqs;
2502 q_size = vhost->scsi_scrqs.active_queues;
2503 } else {
2504 queues = &vhost->crq;
2505 q_size = 1;
2506 }
2507
2508 do {
2509 wait = 0;
2510 spin_lock_irqsave(vhost->host->host_lock, flags);
2511 for (q_index = 0; q_index < q_size; q_index++) {
2512 spin_lock(&queues[q_index].l_lock);
2513 for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2514 evt = &queues[q_index].evt_pool.events[i];
2515 if (!ibmvfc_event_is_free(evt)) {
2516 if (match(evt, device)) {
2517 evt->eh_comp = ∁
2518 wait++;
2519 }
2520 }
2521 }
2522 spin_unlock(&queues[q_index].l_lock);
2523 }
2524 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2525
2526 if (wait) {
2527 timeout = wait_for_completion_timeout(&comp, timeout);
2528
2529 if (!timeout) {
2530 wait = 0;
2531 spin_lock_irqsave(vhost->host->host_lock, flags);
2532 for (q_index = 0; q_index < q_size; q_index++) {
2533 spin_lock(&queues[q_index].l_lock);
2534 for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2535 evt = &queues[q_index].evt_pool.events[i];
2536 if (!ibmvfc_event_is_free(evt)) {
2537 if (match(evt, device)) {
2538 evt->eh_comp = NULL;
2539 wait++;
2540 }
2541 }
2542 }
2543 spin_unlock(&queues[q_index].l_lock);
2544 }
2545 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2546 if (wait)
2547 dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2548 LEAVE;
2549 return wait ? FAILED : SUCCESS;
2550 }
2551 }
2552 } while (wait);
2553
2554 LEAVE;
2555 return SUCCESS;
2556 }
2557
ibmvfc_init_tmf(struct ibmvfc_queue * queue,struct scsi_device * sdev,int type)2558 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2559 struct scsi_device *sdev,
2560 int type)
2561 {
2562 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2563 struct scsi_target *starget = scsi_target(sdev);
2564 struct fc_rport *rport = starget_to_rport(starget);
2565 struct ibmvfc_event *evt;
2566 struct ibmvfc_tmf *tmf;
2567
2568 evt = ibmvfc_get_reserved_event(queue);
2569 if (!evt)
2570 return NULL;
2571 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2572
2573 tmf = &evt->iu.tmf;
2574 memset(tmf, 0, sizeof(*tmf));
2575 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2576 tmf->common.version = cpu_to_be32(2);
2577 tmf->target_wwpn = cpu_to_be64(rport->port_name);
2578 } else {
2579 tmf->common.version = cpu_to_be32(1);
2580 }
2581 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2582 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2583 tmf->scsi_id = cpu_to_be64(rport->port_id);
2584 int_to_scsilun(sdev->lun, &tmf->lun);
2585 if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2586 type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2587 if (vhost->state == IBMVFC_ACTIVE)
2588 tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2589 else
2590 tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2591 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2592 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2593
2594 init_completion(&evt->comp);
2595
2596 return evt;
2597 }
2598
ibmvfc_cancel_all_mq(struct scsi_device * sdev,int type)2599 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2600 {
2601 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2602 struct ibmvfc_event *evt, *found_evt, *temp;
2603 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2604 unsigned long flags;
2605 int num_hwq, i;
2606 int fail = 0;
2607 LIST_HEAD(cancelq);
2608 u16 status;
2609
2610 ENTER;
2611 spin_lock_irqsave(vhost->host->host_lock, flags);
2612 num_hwq = vhost->scsi_scrqs.active_queues;
2613 for (i = 0; i < num_hwq; i++) {
2614 spin_lock(queues[i].q_lock);
2615 spin_lock(&queues[i].l_lock);
2616 found_evt = NULL;
2617 list_for_each_entry(evt, &queues[i].sent, queue_list) {
2618 if (evt->cmnd && evt->cmnd->device == sdev) {
2619 found_evt = evt;
2620 break;
2621 }
2622 }
2623 spin_unlock(&queues[i].l_lock);
2624
2625 if (found_evt && vhost->logged_in) {
2626 evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2627 if (!evt) {
2628 spin_unlock(queues[i].q_lock);
2629 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2630 return -ENOMEM;
2631 }
2632 evt->sync_iu = &queues[i].cancel_rsp;
2633 ibmvfc_send_event(evt, vhost, default_timeout);
2634 list_add_tail(&evt->cancel, &cancelq);
2635 }
2636
2637 spin_unlock(queues[i].q_lock);
2638 }
2639 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2640
2641 if (list_empty(&cancelq)) {
2642 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2643 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2644 return 0;
2645 }
2646
2647 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2648
2649 list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2650 wait_for_completion(&evt->comp);
2651 status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2652 list_del(&evt->cancel);
2653 ibmvfc_free_event(evt);
2654
2655 if (status != IBMVFC_MAD_SUCCESS) {
2656 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2657 switch (status) {
2658 case IBMVFC_MAD_DRIVER_FAILED:
2659 case IBMVFC_MAD_CRQ_ERROR:
2660 /* Host adapter most likely going through reset, return success to
2661 * the caller will wait for the command being cancelled to get returned
2662 */
2663 break;
2664 default:
2665 fail = 1;
2666 break;
2667 }
2668 }
2669 }
2670
2671 if (fail)
2672 return -EIO;
2673
2674 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2675 LEAVE;
2676 return 0;
2677 }
2678
ibmvfc_cancel_all_sq(struct scsi_device * sdev,int type)2679 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2680 {
2681 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2682 struct ibmvfc_event *evt, *found_evt;
2683 union ibmvfc_iu rsp;
2684 int rsp_rc = -EBUSY;
2685 unsigned long flags;
2686 u16 status;
2687
2688 ENTER;
2689 found_evt = NULL;
2690 spin_lock_irqsave(vhost->host->host_lock, flags);
2691 spin_lock(&vhost->crq.l_lock);
2692 list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2693 if (evt->cmnd && evt->cmnd->device == sdev) {
2694 found_evt = evt;
2695 break;
2696 }
2697 }
2698 spin_unlock(&vhost->crq.l_lock);
2699
2700 if (!found_evt) {
2701 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2702 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2703 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2704 return 0;
2705 }
2706
2707 if (vhost->logged_in) {
2708 evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
2709 evt->sync_iu = &rsp;
2710 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2711 }
2712
2713 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2714
2715 if (rsp_rc != 0) {
2716 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2717 /* If failure is received, the host adapter is most likely going
2718 through reset, return success so the caller will wait for the command
2719 being cancelled to get returned */
2720 return 0;
2721 }
2722
2723 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2724
2725 wait_for_completion(&evt->comp);
2726 status = be16_to_cpu(rsp.mad_common.status);
2727 spin_lock_irqsave(vhost->host->host_lock, flags);
2728 ibmvfc_free_event(evt);
2729 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2730
2731 if (status != IBMVFC_MAD_SUCCESS) {
2732 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2733 switch (status) {
2734 case IBMVFC_MAD_DRIVER_FAILED:
2735 case IBMVFC_MAD_CRQ_ERROR:
2736 /* Host adapter most likely going through reset, return success to
2737 the caller will wait for the command being cancelled to get returned */
2738 return 0;
2739 default:
2740 return -EIO;
2741 };
2742 }
2743
2744 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2745 return 0;
2746 }
2747
2748 /**
2749 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2750 * @sdev: scsi device to cancel commands
2751 * @type: type of error recovery being performed
2752 *
2753 * This sends a cancel to the VIOS for the specified device. This does
2754 * NOT send any abort to the actual device. That must be done separately.
2755 *
2756 * Returns:
2757 * 0 on success / other on failure
2758 **/
ibmvfc_cancel_all(struct scsi_device * sdev,int type)2759 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2760 {
2761 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2762
2763 if (vhost->mq_enabled && vhost->using_channels)
2764 return ibmvfc_cancel_all_mq(sdev, type);
2765 else
2766 return ibmvfc_cancel_all_sq(sdev, type);
2767 }
2768
2769 /**
2770 * ibmvfc_match_key - Match function for specified cancel key
2771 * @evt: ibmvfc event struct
2772 * @key: cancel key to match
2773 *
2774 * Returns:
2775 * 1 if event matches key / 0 if event does not match key
2776 **/
ibmvfc_match_key(struct ibmvfc_event * evt,void * key)2777 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2778 {
2779 unsigned long cancel_key = (unsigned long)key;
2780
2781 if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2782 be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2783 return 1;
2784 return 0;
2785 }
2786
2787 /**
2788 * ibmvfc_match_evt - Match function for specified event
2789 * @evt: ibmvfc event struct
2790 * @match: event to match
2791 *
2792 * Returns:
2793 * 1 if event matches key / 0 if event does not match key
2794 **/
ibmvfc_match_evt(struct ibmvfc_event * evt,void * match)2795 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2796 {
2797 if (evt == match)
2798 return 1;
2799 return 0;
2800 }
2801
2802 /**
2803 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2804 * @sdev: scsi device to abort commands
2805 *
2806 * This sends an Abort Task Set to the VIOS for the specified device. This does
2807 * NOT send any cancel to the VIOS. That must be done separately.
2808 *
2809 * Returns:
2810 * 0 on success / other on failure
2811 **/
ibmvfc_abort_task_set(struct scsi_device * sdev)2812 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2813 {
2814 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2815 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2816 struct ibmvfc_cmd *tmf;
2817 struct ibmvfc_event *evt, *found_evt;
2818 union ibmvfc_iu rsp_iu;
2819 struct ibmvfc_fcp_cmd_iu *iu;
2820 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2821 int rc, rsp_rc = -EBUSY;
2822 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2823 int rsp_code = 0;
2824
2825 found_evt = NULL;
2826 spin_lock_irqsave(vhost->host->host_lock, flags);
2827 spin_lock(&vhost->crq.l_lock);
2828 list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2829 if (evt->cmnd && evt->cmnd->device == sdev) {
2830 found_evt = evt;
2831 break;
2832 }
2833 }
2834 spin_unlock(&vhost->crq.l_lock);
2835
2836 if (!found_evt) {
2837 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2838 sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2839 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2840 return 0;
2841 }
2842
2843 if (vhost->state == IBMVFC_ACTIVE) {
2844 evt = ibmvfc_get_event(&vhost->crq);
2845 if (!evt) {
2846 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2847 return -ENOMEM;
2848 }
2849 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2850 tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2851 iu = ibmvfc_get_fcp_iu(vhost, tmf);
2852
2853 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2854 tmf->target_wwpn = cpu_to_be64(rport->port_name);
2855 iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2856 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2857 evt->sync_iu = &rsp_iu;
2858
2859 tmf->correlation = cpu_to_be64((u64)evt);
2860
2861 init_completion(&evt->comp);
2862 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2863 }
2864
2865 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2866
2867 if (rsp_rc != 0) {
2868 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2869 return -EIO;
2870 }
2871
2872 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2873 timeout = wait_for_completion_timeout(&evt->comp, timeout);
2874
2875 if (!timeout) {
2876 rc = ibmvfc_cancel_all(sdev, 0);
2877 if (!rc) {
2878 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2879 if (rc == SUCCESS)
2880 rc = 0;
2881 }
2882
2883 if (rc) {
2884 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2885 ibmvfc_reset_host(vhost);
2886 rsp_rc = -EIO;
2887 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2888
2889 if (rc == SUCCESS)
2890 rsp_rc = 0;
2891
2892 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2893 if (rc != SUCCESS) {
2894 spin_lock_irqsave(vhost->host->host_lock, flags);
2895 ibmvfc_hard_reset_host(vhost);
2896 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2897 rsp_rc = 0;
2898 }
2899
2900 goto out;
2901 }
2902 }
2903
2904 if (rsp_iu.cmd.status)
2905 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2906
2907 if (rsp_code) {
2908 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2909 rsp_code = fc_rsp->data.info.rsp_code;
2910
2911 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2912 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2913 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2914 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2915 fc_rsp->scsi_status);
2916 rsp_rc = -EIO;
2917 } else
2918 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2919
2920 out:
2921 spin_lock_irqsave(vhost->host->host_lock, flags);
2922 ibmvfc_free_event(evt);
2923 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2924 return rsp_rc;
2925 }
2926
2927 /**
2928 * ibmvfc_eh_abort_handler - Abort a command
2929 * @cmd: scsi command to abort
2930 *
2931 * Returns:
2932 * SUCCESS / FAST_IO_FAIL / FAILED
2933 **/
ibmvfc_eh_abort_handler(struct scsi_cmnd * cmd)2934 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2935 {
2936 struct scsi_device *sdev = cmd->device;
2937 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2938 int cancel_rc, block_rc;
2939 int rc = FAILED;
2940
2941 ENTER;
2942 block_rc = fc_block_scsi_eh(cmd);
2943 ibmvfc_wait_while_resetting(vhost);
2944 if (block_rc != FAST_IO_FAIL) {
2945 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2946 ibmvfc_abort_task_set(sdev);
2947 } else
2948 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2949
2950 if (!cancel_rc)
2951 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2952
2953 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2954 rc = FAST_IO_FAIL;
2955
2956 LEAVE;
2957 return rc;
2958 }
2959
2960 /**
2961 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2962 * @cmd: scsi command struct
2963 *
2964 * Returns:
2965 * SUCCESS / FAST_IO_FAIL / FAILED
2966 **/
ibmvfc_eh_device_reset_handler(struct scsi_cmnd * cmd)2967 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2968 {
2969 struct scsi_device *sdev = cmd->device;
2970 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2971 int cancel_rc, block_rc, reset_rc = 0;
2972 int rc = FAILED;
2973
2974 ENTER;
2975 block_rc = fc_block_scsi_eh(cmd);
2976 ibmvfc_wait_while_resetting(vhost);
2977 if (block_rc != FAST_IO_FAIL) {
2978 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2979 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2980 } else
2981 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2982
2983 if (!cancel_rc && !reset_rc)
2984 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2985
2986 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2987 rc = FAST_IO_FAIL;
2988
2989 LEAVE;
2990 return rc;
2991 }
2992
2993 /**
2994 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2995 * @sdev: scsi device struct
2996 * @data: return code
2997 *
2998 **/
ibmvfc_dev_cancel_all_noreset(struct scsi_device * sdev,void * data)2999 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
3000 {
3001 unsigned long *rc = data;
3002 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3003 }
3004
3005 /**
3006 * ibmvfc_eh_target_reset_handler - Reset the target
3007 * @cmd: scsi command struct
3008 *
3009 * Returns:
3010 * SUCCESS / FAST_IO_FAIL / FAILED
3011 **/
ibmvfc_eh_target_reset_handler(struct scsi_cmnd * cmd)3012 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
3013 {
3014 struct scsi_target *starget = scsi_target(cmd->device);
3015 struct fc_rport *rport = starget_to_rport(starget);
3016 struct Scsi_Host *shost = rport_to_shost(rport);
3017 struct ibmvfc_host *vhost = shost_priv(shost);
3018 int block_rc;
3019 int reset_rc = 0;
3020 int rc = FAILED;
3021 unsigned long cancel_rc = 0;
3022 bool tgt_reset = false;
3023
3024 ENTER;
3025 block_rc = fc_block_rport(rport);
3026 ibmvfc_wait_while_resetting(vhost);
3027 if (block_rc != FAST_IO_FAIL) {
3028 struct scsi_device *sdev;
3029
3030 shost_for_each_device(sdev, shost) {
3031 if ((sdev->channel != starget->channel) ||
3032 (sdev->id != starget->id))
3033 continue;
3034
3035 cancel_rc |= ibmvfc_cancel_all(sdev,
3036 IBMVFC_TMF_TGT_RESET);
3037 if (!tgt_reset) {
3038 reset_rc = ibmvfc_reset_device(sdev,
3039 IBMVFC_TARGET_RESET, "target");
3040 tgt_reset = true;
3041 }
3042 }
3043 } else
3044 starget_for_each_device(starget, &cancel_rc,
3045 ibmvfc_dev_cancel_all_noreset);
3046
3047 if (!cancel_rc && !reset_rc)
3048 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
3049
3050 if (block_rc == FAST_IO_FAIL && rc != FAILED)
3051 rc = FAST_IO_FAIL;
3052
3053 LEAVE;
3054 return rc;
3055 }
3056
3057 /**
3058 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
3059 * @cmd: struct scsi_cmnd having problems
3060 *
3061 **/
ibmvfc_eh_host_reset_handler(struct scsi_cmnd * cmd)3062 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
3063 {
3064 int rc;
3065 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
3066
3067 dev_err(vhost->dev, "Resetting connection due to error recovery\n");
3068 rc = ibmvfc_issue_fc_host_lip(vhost->host);
3069
3070 return rc ? FAILED : SUCCESS;
3071 }
3072
3073 /**
3074 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
3075 * @rport: rport struct
3076 *
3077 * Return value:
3078 * none
3079 **/
ibmvfc_terminate_rport_io(struct fc_rport * rport)3080 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3081 {
3082 struct Scsi_Host *shost = rport_to_shost(rport);
3083 struct ibmvfc_host *vhost = shost_priv(shost);
3084 struct fc_rport *dev_rport;
3085 struct scsi_device *sdev;
3086 struct ibmvfc_target *tgt;
3087 unsigned long rc, flags;
3088 unsigned int found;
3089
3090 ENTER;
3091 shost_for_each_device(sdev, shost) {
3092 dev_rport = starget_to_rport(scsi_target(sdev));
3093 if (dev_rport != rport)
3094 continue;
3095 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3096 }
3097
3098 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3099
3100 if (rc == FAILED)
3101 ibmvfc_issue_fc_host_lip(shost);
3102
3103 spin_lock_irqsave(shost->host_lock, flags);
3104 found = 0;
3105 list_for_each_entry(tgt, &vhost->targets, queue) {
3106 if (tgt->scsi_id == rport->port_id) {
3107 found++;
3108 break;
3109 }
3110 }
3111
3112 if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3113 /*
3114 * If we get here, that means we previously attempted to send
3115 * an implicit logout to the target but it failed, most likely
3116 * due to I/O being pending, so we need to send it again
3117 */
3118 ibmvfc_del_tgt(tgt);
3119 ibmvfc_reinit_host(vhost);
3120 }
3121
3122 spin_unlock_irqrestore(shost->host_lock, flags);
3123 LEAVE;
3124 }
3125
3126 static const struct ibmvfc_async_desc ae_desc [] = {
3127 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3128 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3129 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3130 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3131 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3132 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL },
3133 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL },
3134 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL },
3135 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL },
3136 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL },
3137 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL },
3138 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL },
3139 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3140 };
3141
3142 static const struct ibmvfc_async_desc unknown_ae = {
3143 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3144 };
3145
3146 /**
3147 * ibmvfc_get_ae_desc - Get text description for async event
3148 * @ae: async event
3149 *
3150 **/
ibmvfc_get_ae_desc(u64 ae)3151 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3152 {
3153 int i;
3154
3155 for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3156 if (ae_desc[i].ae == ae)
3157 return &ae_desc[i];
3158
3159 return &unknown_ae;
3160 }
3161
3162 static const struct {
3163 enum ibmvfc_ae_link_state state;
3164 const char *desc;
3165 } link_desc [] = {
3166 { IBMVFC_AE_LS_LINK_UP, " link up" },
3167 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" },
3168 { IBMVFC_AE_LS_LINK_DOWN, " link down" },
3169 { IBMVFC_AE_LS_LINK_DEAD, " link dead" },
3170 };
3171
3172 /**
3173 * ibmvfc_get_link_state - Get text description for link state
3174 * @state: link state
3175 *
3176 **/
ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)3177 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3178 {
3179 int i;
3180
3181 for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3182 if (link_desc[i].state == state)
3183 return link_desc[i].desc;
3184
3185 return "";
3186 }
3187
3188 /**
3189 * ibmvfc_handle_async - Handle an async event from the adapter
3190 * @crq: crq to process
3191 * @vhost: ibmvfc host struct
3192 *
3193 **/
ibmvfc_handle_async(struct ibmvfc_async_crq * crq,struct ibmvfc_host * vhost)3194 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3195 struct ibmvfc_host *vhost)
3196 {
3197 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3198 struct ibmvfc_target *tgt;
3199
3200 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3201 " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3202 be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3203 ibmvfc_get_link_state(crq->link_state));
3204
3205 switch (be64_to_cpu(crq->event)) {
3206 case IBMVFC_AE_RESUME:
3207 switch (crq->link_state) {
3208 case IBMVFC_AE_LS_LINK_DOWN:
3209 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3210 break;
3211 case IBMVFC_AE_LS_LINK_DEAD:
3212 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3213 break;
3214 case IBMVFC_AE_LS_LINK_UP:
3215 case IBMVFC_AE_LS_LINK_BOUNCED:
3216 default:
3217 vhost->events_to_log |= IBMVFC_AE_LINKUP;
3218 vhost->delay_init = 1;
3219 __ibmvfc_reset_host(vhost);
3220 break;
3221 }
3222
3223 break;
3224 case IBMVFC_AE_LINK_UP:
3225 vhost->events_to_log |= IBMVFC_AE_LINKUP;
3226 vhost->delay_init = 1;
3227 __ibmvfc_reset_host(vhost);
3228 break;
3229 case IBMVFC_AE_SCN_FABRIC:
3230 case IBMVFC_AE_SCN_DOMAIN:
3231 vhost->events_to_log |= IBMVFC_AE_RSCN;
3232 if (vhost->state < IBMVFC_HALTED) {
3233 vhost->delay_init = 1;
3234 __ibmvfc_reset_host(vhost);
3235 }
3236 break;
3237 case IBMVFC_AE_SCN_NPORT:
3238 case IBMVFC_AE_SCN_GROUP:
3239 vhost->events_to_log |= IBMVFC_AE_RSCN;
3240 ibmvfc_reinit_host(vhost);
3241 break;
3242 case IBMVFC_AE_ELS_LOGO:
3243 case IBMVFC_AE_ELS_PRLO:
3244 case IBMVFC_AE_ELS_PLOGI:
3245 list_for_each_entry(tgt, &vhost->targets, queue) {
3246 if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3247 break;
3248 if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3249 continue;
3250 if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3251 continue;
3252 if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3253 continue;
3254 if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3255 tgt->logo_rcvd = 1;
3256 if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3257 ibmvfc_del_tgt(tgt);
3258 ibmvfc_reinit_host(vhost);
3259 }
3260 }
3261 break;
3262 case IBMVFC_AE_LINK_DOWN:
3263 case IBMVFC_AE_ADAPTER_FAILED:
3264 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3265 break;
3266 case IBMVFC_AE_LINK_DEAD:
3267 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3268 break;
3269 case IBMVFC_AE_HALT:
3270 ibmvfc_link_down(vhost, IBMVFC_HALTED);
3271 break;
3272 default:
3273 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3274 break;
3275 }
3276 }
3277
3278 /**
3279 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3280 * @crq: Command/Response queue
3281 * @vhost: ibmvfc host struct
3282 * @evt_doneq: Event done queue
3283 *
3284 **/
ibmvfc_handle_crq(struct ibmvfc_crq * crq,struct ibmvfc_host * vhost,struct list_head * evt_doneq)3285 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3286 struct list_head *evt_doneq)
3287 {
3288 long rc;
3289 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3290
3291 switch (crq->valid) {
3292 case IBMVFC_CRQ_INIT_RSP:
3293 switch (crq->format) {
3294 case IBMVFC_CRQ_INIT:
3295 dev_info(vhost->dev, "Partner initialized\n");
3296 /* Send back a response */
3297 rc = ibmvfc_send_crq_init_complete(vhost);
3298 if (rc == 0)
3299 ibmvfc_init_host(vhost);
3300 else
3301 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3302 break;
3303 case IBMVFC_CRQ_INIT_COMPLETE:
3304 dev_info(vhost->dev, "Partner initialization complete\n");
3305 ibmvfc_init_host(vhost);
3306 break;
3307 default:
3308 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3309 }
3310 return;
3311 case IBMVFC_CRQ_XPORT_EVENT:
3312 vhost->state = IBMVFC_NO_CRQ;
3313 vhost->logged_in = 0;
3314 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3315 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3316 /* We need to re-setup the interpartition connection */
3317 dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3318 vhost->client_migrated = 1;
3319
3320 scsi_block_requests(vhost->host);
3321 ibmvfc_purge_requests(vhost, DID_REQUEUE);
3322 ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN);
3323 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3324 wake_up(&vhost->work_wait_q);
3325 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3326 dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3327 ibmvfc_purge_requests(vhost, DID_ERROR);
3328 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3329 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3330 } else {
3331 dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3332 }
3333 return;
3334 case IBMVFC_CRQ_CMD_RSP:
3335 break;
3336 default:
3337 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3338 return;
3339 }
3340
3341 if (crq->format == IBMVFC_ASYNC_EVENT)
3342 return;
3343
3344 /* The only kind of payload CRQs we should get are responses to
3345 * things we send. Make sure this response is to something we
3346 * actually sent
3347 */
3348 if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3349 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3350 crq->ioba);
3351 return;
3352 }
3353
3354 if (unlikely(atomic_dec_if_positive(&evt->active))) {
3355 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3356 crq->ioba);
3357 return;
3358 }
3359
3360 spin_lock(&evt->queue->l_lock);
3361 list_move_tail(&evt->queue_list, evt_doneq);
3362 spin_unlock(&evt->queue->l_lock);
3363 }
3364
3365 /**
3366 * ibmvfc_scan_finished - Check if the device scan is done.
3367 * @shost: scsi host struct
3368 * @time: current elapsed time
3369 *
3370 * Returns:
3371 * 0 if scan is not done / 1 if scan is done
3372 **/
ibmvfc_scan_finished(struct Scsi_Host * shost,unsigned long time)3373 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3374 {
3375 unsigned long flags;
3376 struct ibmvfc_host *vhost = shost_priv(shost);
3377 int done = 0;
3378
3379 spin_lock_irqsave(shost->host_lock, flags);
3380 if (!vhost->scan_timeout)
3381 done = 1;
3382 else if (time >= (vhost->scan_timeout * HZ)) {
3383 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3384 "continuing initialization\n", vhost->scan_timeout);
3385 done = 1;
3386 }
3387
3388 if (vhost->scan_complete) {
3389 vhost->scan_timeout = init_timeout;
3390 done = 1;
3391 }
3392 spin_unlock_irqrestore(shost->host_lock, flags);
3393 return done;
3394 }
3395
3396 /**
3397 * ibmvfc_sdev_init - Setup the device's task set value
3398 * @sdev: struct scsi_device device to configure
3399 *
3400 * Set the device's task set value so that error handling works as
3401 * expected.
3402 *
3403 * Returns:
3404 * 0 on success / -ENXIO if device does not exist
3405 **/
ibmvfc_sdev_init(struct scsi_device * sdev)3406 static int ibmvfc_sdev_init(struct scsi_device *sdev)
3407 {
3408 struct Scsi_Host *shost = sdev->host;
3409 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3410 struct ibmvfc_host *vhost = shost_priv(shost);
3411 unsigned long flags = 0;
3412
3413 if (!rport || fc_remote_port_chkready(rport))
3414 return -ENXIO;
3415
3416 spin_lock_irqsave(shost->host_lock, flags);
3417 sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3418 spin_unlock_irqrestore(shost->host_lock, flags);
3419 return 0;
3420 }
3421
3422 /**
3423 * ibmvfc_target_alloc - Setup the target's task set value
3424 * @starget: struct scsi_target
3425 *
3426 * Set the target's task set value so that error handling works as
3427 * expected.
3428 *
3429 * Returns:
3430 * 0 on success / -ENXIO if device does not exist
3431 **/
ibmvfc_target_alloc(struct scsi_target * starget)3432 static int ibmvfc_target_alloc(struct scsi_target *starget)
3433 {
3434 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3435 struct ibmvfc_host *vhost = shost_priv(shost);
3436 unsigned long flags = 0;
3437
3438 spin_lock_irqsave(shost->host_lock, flags);
3439 starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3440 spin_unlock_irqrestore(shost->host_lock, flags);
3441 return 0;
3442 }
3443
3444 /**
3445 * ibmvfc_sdev_configure - Configure the device
3446 * @sdev: struct scsi_device device to configure
3447 * @lim: Request queue limits
3448 *
3449 * Enable allow_restart for a device if it is a disk. Adjust the
3450 * queue_depth here also.
3451 *
3452 * Returns:
3453 * 0
3454 **/
ibmvfc_sdev_configure(struct scsi_device * sdev,struct queue_limits * lim)3455 static int ibmvfc_sdev_configure(struct scsi_device *sdev,
3456 struct queue_limits *lim)
3457 {
3458 struct Scsi_Host *shost = sdev->host;
3459 unsigned long flags = 0;
3460
3461 spin_lock_irqsave(shost->host_lock, flags);
3462 if (sdev->type == TYPE_DISK) {
3463 sdev->allow_restart = 1;
3464 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3465 }
3466 spin_unlock_irqrestore(shost->host_lock, flags);
3467 return 0;
3468 }
3469
3470 /**
3471 * ibmvfc_change_queue_depth - Change the device's queue depth
3472 * @sdev: scsi device struct
3473 * @qdepth: depth to set
3474 *
3475 * Return value:
3476 * actual depth set
3477 **/
ibmvfc_change_queue_depth(struct scsi_device * sdev,int qdepth)3478 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3479 {
3480 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3481 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3482
3483 return scsi_change_queue_depth(sdev, qdepth);
3484 }
3485
ibmvfc_show_host_partition_name(struct device * dev,struct device_attribute * attr,char * buf)3486 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3487 struct device_attribute *attr, char *buf)
3488 {
3489 struct Scsi_Host *shost = class_to_shost(dev);
3490 struct ibmvfc_host *vhost = shost_priv(shost);
3491
3492 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.partition_name);
3493 }
3494
ibmvfc_show_host_device_name(struct device * dev,struct device_attribute * attr,char * buf)3495 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3496 struct device_attribute *attr, char *buf)
3497 {
3498 struct Scsi_Host *shost = class_to_shost(dev);
3499 struct ibmvfc_host *vhost = shost_priv(shost);
3500
3501 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.device_name);
3502 }
3503
ibmvfc_show_host_loc_code(struct device * dev,struct device_attribute * attr,char * buf)3504 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3505 struct device_attribute *attr, char *buf)
3506 {
3507 struct Scsi_Host *shost = class_to_shost(dev);
3508 struct ibmvfc_host *vhost = shost_priv(shost);
3509
3510 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.port_loc_code);
3511 }
3512
ibmvfc_show_host_drc_name(struct device * dev,struct device_attribute * attr,char * buf)3513 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3514 struct device_attribute *attr, char *buf)
3515 {
3516 struct Scsi_Host *shost = class_to_shost(dev);
3517 struct ibmvfc_host *vhost = shost_priv(shost);
3518
3519 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.drc_name);
3520 }
3521
ibmvfc_show_host_npiv_version(struct device * dev,struct device_attribute * attr,char * buf)3522 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3523 struct device_attribute *attr, char *buf)
3524 {
3525 struct Scsi_Host *shost = class_to_shost(dev);
3526 struct ibmvfc_host *vhost = shost_priv(shost);
3527 return sysfs_emit(buf, "%d\n",
3528 be32_to_cpu(vhost->login_buf->resp.version));
3529 }
3530
ibmvfc_show_host_capabilities(struct device * dev,struct device_attribute * attr,char * buf)3531 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3532 struct device_attribute *attr, char *buf)
3533 {
3534 struct Scsi_Host *shost = class_to_shost(dev);
3535 struct ibmvfc_host *vhost = shost_priv(shost);
3536 return sysfs_emit(buf, "%llx\n",
3537 be64_to_cpu(vhost->login_buf->resp.capabilities));
3538 }
3539
3540 /**
3541 * ibmvfc_show_log_level - Show the adapter's error logging level
3542 * @dev: class device struct
3543 * @attr: unused
3544 * @buf: buffer
3545 *
3546 * Return value:
3547 * number of bytes printed to buffer
3548 **/
ibmvfc_show_log_level(struct device * dev,struct device_attribute * attr,char * buf)3549 static ssize_t ibmvfc_show_log_level(struct device *dev,
3550 struct device_attribute *attr, char *buf)
3551 {
3552 struct Scsi_Host *shost = class_to_shost(dev);
3553 struct ibmvfc_host *vhost = shost_priv(shost);
3554 unsigned long flags = 0;
3555 int len;
3556
3557 spin_lock_irqsave(shost->host_lock, flags);
3558 len = sysfs_emit(buf, "%d\n", vhost->log_level);
3559 spin_unlock_irqrestore(shost->host_lock, flags);
3560 return len;
3561 }
3562
3563 /**
3564 * ibmvfc_store_log_level - Change the adapter's error logging level
3565 * @dev: class device struct
3566 * @attr: unused
3567 * @buf: buffer
3568 * @count: buffer size
3569 *
3570 * Return value:
3571 * number of bytes printed to buffer
3572 **/
ibmvfc_store_log_level(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)3573 static ssize_t ibmvfc_store_log_level(struct device *dev,
3574 struct device_attribute *attr,
3575 const char *buf, size_t count)
3576 {
3577 struct Scsi_Host *shost = class_to_shost(dev);
3578 struct ibmvfc_host *vhost = shost_priv(shost);
3579 unsigned long flags = 0;
3580
3581 spin_lock_irqsave(shost->host_lock, flags);
3582 vhost->log_level = simple_strtoul(buf, NULL, 10);
3583 spin_unlock_irqrestore(shost->host_lock, flags);
3584 return strlen(buf);
3585 }
3586
ibmvfc_show_scsi_channels(struct device * dev,struct device_attribute * attr,char * buf)3587 static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3588 struct device_attribute *attr, char *buf)
3589 {
3590 struct Scsi_Host *shost = class_to_shost(dev);
3591 struct ibmvfc_host *vhost = shost_priv(shost);
3592 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3593 unsigned long flags = 0;
3594 int len;
3595
3596 spin_lock_irqsave(shost->host_lock, flags);
3597 len = sysfs_emit(buf, "%d\n", scsi->desired_queues);
3598 spin_unlock_irqrestore(shost->host_lock, flags);
3599 return len;
3600 }
3601
ibmvfc_store_scsi_channels(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)3602 static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3603 struct device_attribute *attr,
3604 const char *buf, size_t count)
3605 {
3606 struct Scsi_Host *shost = class_to_shost(dev);
3607 struct ibmvfc_host *vhost = shost_priv(shost);
3608 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3609 unsigned long flags = 0;
3610 unsigned int channels;
3611
3612 spin_lock_irqsave(shost->host_lock, flags);
3613 channels = simple_strtoul(buf, NULL, 10);
3614 scsi->desired_queues = min(channels, shost->nr_hw_queues);
3615 ibmvfc_hard_reset_host(vhost);
3616 spin_unlock_irqrestore(shost->host_lock, flags);
3617 return strlen(buf);
3618 }
3619
3620 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3621 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3622 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3623 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3624 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3625 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3626 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3627 ibmvfc_show_log_level, ibmvfc_store_log_level);
3628 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3629 ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3630
3631 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3632 /**
3633 * ibmvfc_read_trace - Dump the adapter trace
3634 * @filp: open sysfs file
3635 * @kobj: kobject struct
3636 * @bin_attr: bin_attribute struct
3637 * @buf: buffer
3638 * @off: offset
3639 * @count: buffer size
3640 *
3641 * Return value:
3642 * number of bytes printed to buffer
3643 **/
ibmvfc_read_trace(struct file * filp,struct kobject * kobj,const struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)3644 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3645 const struct bin_attribute *bin_attr,
3646 char *buf, loff_t off, size_t count)
3647 {
3648 struct device *dev = kobj_to_dev(kobj);
3649 struct Scsi_Host *shost = class_to_shost(dev);
3650 struct ibmvfc_host *vhost = shost_priv(shost);
3651 unsigned long flags = 0;
3652 int size = IBMVFC_TRACE_SIZE;
3653 char *src = (char *)vhost->trace;
3654
3655 if (off > size)
3656 return 0;
3657 if (off + count > size) {
3658 size -= off;
3659 count = size;
3660 }
3661
3662 spin_lock_irqsave(shost->host_lock, flags);
3663 memcpy(buf, &src[off], count);
3664 spin_unlock_irqrestore(shost->host_lock, flags);
3665 return count;
3666 }
3667
3668 static const struct bin_attribute ibmvfc_trace_attr = {
3669 .attr = {
3670 .name = "trace",
3671 .mode = S_IRUGO,
3672 },
3673 .size = 0,
3674 .read = ibmvfc_read_trace,
3675 };
3676 #endif
3677
3678 static struct attribute *ibmvfc_host_attrs[] = {
3679 &dev_attr_partition_name.attr,
3680 &dev_attr_device_name.attr,
3681 &dev_attr_port_loc_code.attr,
3682 &dev_attr_drc_name.attr,
3683 &dev_attr_npiv_version.attr,
3684 &dev_attr_capabilities.attr,
3685 &dev_attr_log_level.attr,
3686 &dev_attr_nr_scsi_channels.attr,
3687 NULL
3688 };
3689
3690 ATTRIBUTE_GROUPS(ibmvfc_host);
3691
3692 static const struct scsi_host_template driver_template = {
3693 .module = THIS_MODULE,
3694 .name = "IBM POWER Virtual FC Adapter",
3695 .proc_name = IBMVFC_NAME,
3696 .queuecommand = ibmvfc_queuecommand,
3697 .eh_timed_out = fc_eh_timed_out,
3698 .eh_abort_handler = ibmvfc_eh_abort_handler,
3699 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3700 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3701 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3702 .sdev_init = ibmvfc_sdev_init,
3703 .sdev_configure = ibmvfc_sdev_configure,
3704 .target_alloc = ibmvfc_target_alloc,
3705 .scan_finished = ibmvfc_scan_finished,
3706 .change_queue_depth = ibmvfc_change_queue_depth,
3707 .cmd_per_lun = 16,
3708 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3709 .this_id = -1,
3710 .sg_tablesize = SG_ALL,
3711 .max_sectors = IBMVFC_MAX_SECTORS,
3712 .shost_groups = ibmvfc_host_groups,
3713 .track_queue_depth = 1,
3714 };
3715
3716 /**
3717 * ibmvfc_next_async_crq - Returns the next entry in async queue
3718 * @vhost: ibmvfc host struct
3719 *
3720 * Returns:
3721 * Pointer to next entry in queue / NULL if empty
3722 **/
ibmvfc_next_async_crq(struct ibmvfc_host * vhost)3723 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3724 {
3725 struct ibmvfc_queue *async_crq = &vhost->async_crq;
3726 struct ibmvfc_async_crq *crq;
3727
3728 crq = &async_crq->msgs.async[async_crq->cur];
3729 if (crq->valid & 0x80) {
3730 if (++async_crq->cur == async_crq->size)
3731 async_crq->cur = 0;
3732 rmb();
3733 } else
3734 crq = NULL;
3735
3736 return crq;
3737 }
3738
3739 /**
3740 * ibmvfc_next_crq - Returns the next entry in message queue
3741 * @vhost: ibmvfc host struct
3742 *
3743 * Returns:
3744 * Pointer to next entry in queue / NULL if empty
3745 **/
ibmvfc_next_crq(struct ibmvfc_host * vhost)3746 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3747 {
3748 struct ibmvfc_queue *queue = &vhost->crq;
3749 struct ibmvfc_crq *crq;
3750
3751 crq = &queue->msgs.crq[queue->cur];
3752 if (crq->valid & 0x80) {
3753 if (++queue->cur == queue->size)
3754 queue->cur = 0;
3755 rmb();
3756 } else
3757 crq = NULL;
3758
3759 return crq;
3760 }
3761
3762 /**
3763 * ibmvfc_interrupt - Interrupt handler
3764 * @irq: number of irq to handle, not used
3765 * @dev_instance: ibmvfc_host that received interrupt
3766 *
3767 * Returns:
3768 * IRQ_HANDLED
3769 **/
ibmvfc_interrupt(int irq,void * dev_instance)3770 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3771 {
3772 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3773 unsigned long flags;
3774
3775 spin_lock_irqsave(vhost->host->host_lock, flags);
3776 vio_disable_interrupts(to_vio_dev(vhost->dev));
3777 tasklet_schedule(&vhost->tasklet);
3778 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3779 return IRQ_HANDLED;
3780 }
3781
3782 /**
3783 * ibmvfc_tasklet - Interrupt handler tasklet
3784 * @data: ibmvfc host struct
3785 *
3786 * Returns:
3787 * Nothing
3788 **/
ibmvfc_tasklet(void * data)3789 static void ibmvfc_tasklet(void *data)
3790 {
3791 struct ibmvfc_host *vhost = data;
3792 struct vio_dev *vdev = to_vio_dev(vhost->dev);
3793 struct ibmvfc_crq *crq;
3794 struct ibmvfc_async_crq *async;
3795 struct ibmvfc_event *evt, *temp;
3796 unsigned long flags;
3797 int done = 0;
3798 LIST_HEAD(evt_doneq);
3799
3800 spin_lock_irqsave(vhost->host->host_lock, flags);
3801 spin_lock(vhost->crq.q_lock);
3802 while (!done) {
3803 /* Pull all the valid messages off the async CRQ */
3804 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3805 ibmvfc_handle_async(async, vhost);
3806 async->valid = 0;
3807 wmb();
3808 }
3809
3810 /* Pull all the valid messages off the CRQ */
3811 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3812 ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3813 crq->valid = 0;
3814 wmb();
3815 }
3816
3817 vio_enable_interrupts(vdev);
3818 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3819 vio_disable_interrupts(vdev);
3820 ibmvfc_handle_async(async, vhost);
3821 async->valid = 0;
3822 wmb();
3823 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3824 vio_disable_interrupts(vdev);
3825 ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3826 crq->valid = 0;
3827 wmb();
3828 } else
3829 done = 1;
3830 }
3831
3832 spin_unlock(vhost->crq.q_lock);
3833 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3834
3835 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3836 timer_delete(&evt->timer);
3837 list_del(&evt->queue_list);
3838 ibmvfc_trc_end(evt);
3839 evt->done(evt);
3840 }
3841 }
3842
ibmvfc_toggle_scrq_irq(struct ibmvfc_queue * scrq,int enable)3843 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3844 {
3845 struct device *dev = scrq->vhost->dev;
3846 struct vio_dev *vdev = to_vio_dev(dev);
3847 unsigned long rc;
3848 int irq_action = H_ENABLE_VIO_INTERRUPT;
3849
3850 if (!enable)
3851 irq_action = H_DISABLE_VIO_INTERRUPT;
3852
3853 rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3854 scrq->hw_irq, 0, 0);
3855
3856 if (rc)
3857 dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3858 enable ? "enable" : "disable", scrq->hwq_id, rc);
3859
3860 return rc;
3861 }
3862
ibmvfc_handle_scrq(struct ibmvfc_crq * crq,struct ibmvfc_host * vhost,struct list_head * evt_doneq)3863 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3864 struct list_head *evt_doneq)
3865 {
3866 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3867
3868 switch (crq->valid) {
3869 case IBMVFC_CRQ_CMD_RSP:
3870 break;
3871 case IBMVFC_CRQ_XPORT_EVENT:
3872 return;
3873 default:
3874 dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3875 return;
3876 }
3877
3878 /* The only kind of payload CRQs we should get are responses to
3879 * things we send. Make sure this response is to something we
3880 * actually sent
3881 */
3882 if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3883 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3884 crq->ioba);
3885 return;
3886 }
3887
3888 if (unlikely(atomic_dec_if_positive(&evt->active))) {
3889 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3890 crq->ioba);
3891 return;
3892 }
3893
3894 spin_lock(&evt->queue->l_lock);
3895 list_move_tail(&evt->queue_list, evt_doneq);
3896 spin_unlock(&evt->queue->l_lock);
3897 }
3898
ibmvfc_next_scrq(struct ibmvfc_queue * scrq)3899 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3900 {
3901 struct ibmvfc_crq *crq;
3902
3903 crq = &scrq->msgs.scrq[scrq->cur].crq;
3904 if (crq->valid & 0x80) {
3905 if (++scrq->cur == scrq->size)
3906 scrq->cur = 0;
3907 rmb();
3908 } else
3909 crq = NULL;
3910
3911 return crq;
3912 }
3913
ibmvfc_drain_sub_crq(struct ibmvfc_queue * scrq)3914 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3915 {
3916 struct ibmvfc_crq *crq;
3917 struct ibmvfc_event *evt, *temp;
3918 unsigned long flags;
3919 int done = 0;
3920 LIST_HEAD(evt_doneq);
3921
3922 spin_lock_irqsave(scrq->q_lock, flags);
3923 while (!done) {
3924 while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3925 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3926 crq->valid = 0;
3927 wmb();
3928 }
3929
3930 ibmvfc_toggle_scrq_irq(scrq, 1);
3931 if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3932 ibmvfc_toggle_scrq_irq(scrq, 0);
3933 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3934 crq->valid = 0;
3935 wmb();
3936 } else
3937 done = 1;
3938 }
3939 spin_unlock_irqrestore(scrq->q_lock, flags);
3940
3941 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3942 timer_delete(&evt->timer);
3943 list_del(&evt->queue_list);
3944 ibmvfc_trc_end(evt);
3945 evt->done(evt);
3946 }
3947 }
3948
ibmvfc_interrupt_mq(int irq,void * scrq_instance)3949 static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance)
3950 {
3951 struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3952
3953 ibmvfc_toggle_scrq_irq(scrq, 0);
3954 ibmvfc_drain_sub_crq(scrq);
3955
3956 return IRQ_HANDLED;
3957 }
3958
3959 /**
3960 * ibmvfc_init_tgt - Set the next init job step for the target
3961 * @tgt: ibmvfc target struct
3962 * @job_step: job step to perform
3963 *
3964 **/
ibmvfc_init_tgt(struct ibmvfc_target * tgt,void (* job_step)(struct ibmvfc_target *))3965 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3966 void (*job_step) (struct ibmvfc_target *))
3967 {
3968 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3969 tgt->job_step = job_step;
3970 wake_up(&tgt->vhost->work_wait_q);
3971 }
3972
3973 /**
3974 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3975 * @tgt: ibmvfc target struct
3976 * @job_step: initialization job step
3977 *
3978 * Returns: 1 if step will be retried / 0 if not
3979 *
3980 **/
ibmvfc_retry_tgt_init(struct ibmvfc_target * tgt,void (* job_step)(struct ibmvfc_target *))3981 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3982 void (*job_step) (struct ibmvfc_target *))
3983 {
3984 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3985 ibmvfc_del_tgt(tgt);
3986 wake_up(&tgt->vhost->work_wait_q);
3987 return 0;
3988 } else
3989 ibmvfc_init_tgt(tgt, job_step);
3990 return 1;
3991 }
3992
3993 /* Defined in FC-LS */
3994 static const struct {
3995 int code;
3996 int retry;
3997 int logged_in;
3998 } prli_rsp [] = {
3999 { 0, 1, 0 },
4000 { 1, 0, 1 },
4001 { 2, 1, 0 },
4002 { 3, 1, 0 },
4003 { 4, 0, 0 },
4004 { 5, 0, 0 },
4005 { 6, 0, 1 },
4006 { 7, 0, 0 },
4007 { 8, 1, 0 },
4008 };
4009
4010 /**
4011 * ibmvfc_get_prli_rsp - Find PRLI response index
4012 * @flags: PRLI response flags
4013 *
4014 **/
ibmvfc_get_prli_rsp(u16 flags)4015 static int ibmvfc_get_prli_rsp(u16 flags)
4016 {
4017 int i;
4018 int code = (flags & 0x0f00) >> 8;
4019
4020 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
4021 if (prli_rsp[i].code == code)
4022 return i;
4023
4024 return 0;
4025 }
4026
4027 /**
4028 * ibmvfc_tgt_prli_done - Completion handler for Process Login
4029 * @evt: ibmvfc event struct
4030 *
4031 **/
ibmvfc_tgt_prli_done(struct ibmvfc_event * evt)4032 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
4033 {
4034 struct ibmvfc_target *tgt = evt->tgt;
4035 struct ibmvfc_host *vhost = evt->vhost;
4036 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
4037 struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
4038 u32 status = be16_to_cpu(rsp->common.status);
4039 int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
4040
4041 vhost->discovery_threads--;
4042 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4043 switch (status) {
4044 case IBMVFC_MAD_SUCCESS:
4045 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
4046 parms->type, parms->flags, parms->service_parms);
4047
4048 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
4049 index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
4050 if (prli_rsp[index].logged_in) {
4051 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
4052 tgt->need_login = 0;
4053 tgt->ids.roles = 0;
4054 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
4055 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
4056 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
4057 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
4058 tgt->add_rport = 1;
4059 } else
4060 ibmvfc_del_tgt(tgt);
4061 } else if (prli_rsp[index].retry)
4062 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4063 else
4064 ibmvfc_del_tgt(tgt);
4065 } else
4066 ibmvfc_del_tgt(tgt);
4067 break;
4068 case IBMVFC_MAD_DRIVER_FAILED:
4069 break;
4070 case IBMVFC_MAD_CRQ_ERROR:
4071 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4072 break;
4073 case IBMVFC_MAD_FAILED:
4074 default:
4075 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
4076 be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
4077 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4078 else if (tgt->logo_rcvd)
4079 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4080 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4081 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4082 else
4083 ibmvfc_del_tgt(tgt);
4084
4085 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4086 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4087 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4088 break;
4089 }
4090
4091 kref_put(&tgt->kref, ibmvfc_release_tgt);
4092 ibmvfc_free_event(evt);
4093 wake_up(&vhost->work_wait_q);
4094 }
4095
4096 /**
4097 * ibmvfc_tgt_send_prli - Send a process login
4098 * @tgt: ibmvfc target struct
4099 *
4100 **/
ibmvfc_tgt_send_prli(struct ibmvfc_target * tgt)4101 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4102 {
4103 struct ibmvfc_process_login *prli;
4104 struct ibmvfc_host *vhost = tgt->vhost;
4105 struct ibmvfc_event *evt;
4106
4107 if (vhost->discovery_threads >= disc_threads)
4108 return;
4109
4110 kref_get(&tgt->kref);
4111 evt = ibmvfc_get_reserved_event(&vhost->crq);
4112 if (!evt) {
4113 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4114 kref_put(&tgt->kref, ibmvfc_release_tgt);
4115 __ibmvfc_reset_host(vhost);
4116 return;
4117 }
4118 vhost->discovery_threads++;
4119 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4120 evt->tgt = tgt;
4121 prli = &evt->iu.prli;
4122 memset(prli, 0, sizeof(*prli));
4123 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4124 prli->common.version = cpu_to_be32(2);
4125 prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4126 } else {
4127 prli->common.version = cpu_to_be32(1);
4128 }
4129 prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4130 prli->common.length = cpu_to_be16(sizeof(*prli));
4131 prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4132
4133 prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4134 prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4135 prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4136 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4137
4138 if (cls3_error)
4139 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4140
4141 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4142 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4143 vhost->discovery_threads--;
4144 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4145 kref_put(&tgt->kref, ibmvfc_release_tgt);
4146 } else
4147 tgt_dbg(tgt, "Sent process login\n");
4148 }
4149
4150 /**
4151 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4152 * @evt: ibmvfc event struct
4153 *
4154 **/
ibmvfc_tgt_plogi_done(struct ibmvfc_event * evt)4155 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4156 {
4157 struct ibmvfc_target *tgt = evt->tgt;
4158 struct ibmvfc_host *vhost = evt->vhost;
4159 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4160 u32 status = be16_to_cpu(rsp->common.status);
4161 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4162
4163 vhost->discovery_threads--;
4164 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4165 switch (status) {
4166 case IBMVFC_MAD_SUCCESS:
4167 tgt_dbg(tgt, "Port Login succeeded\n");
4168 if (tgt->ids.port_name &&
4169 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4170 vhost->reinit = 1;
4171 tgt_dbg(tgt, "Port re-init required\n");
4172 break;
4173 }
4174 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4175 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4176 tgt->ids.port_id = tgt->scsi_id;
4177 memcpy(&tgt->service_parms, &rsp->service_parms,
4178 sizeof(tgt->service_parms));
4179 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4180 sizeof(tgt->service_parms_change));
4181 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4182 break;
4183 case IBMVFC_MAD_DRIVER_FAILED:
4184 break;
4185 case IBMVFC_MAD_CRQ_ERROR:
4186 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4187 break;
4188 case IBMVFC_MAD_FAILED:
4189 default:
4190 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4191 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4192 else
4193 ibmvfc_del_tgt(tgt);
4194
4195 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4196 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4197 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4198 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4199 ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4200 break;
4201 }
4202
4203 kref_put(&tgt->kref, ibmvfc_release_tgt);
4204 ibmvfc_free_event(evt);
4205 wake_up(&vhost->work_wait_q);
4206 }
4207
4208 /**
4209 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4210 * @tgt: ibmvfc target struct
4211 *
4212 **/
ibmvfc_tgt_send_plogi(struct ibmvfc_target * tgt)4213 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4214 {
4215 struct ibmvfc_port_login *plogi;
4216 struct ibmvfc_host *vhost = tgt->vhost;
4217 struct ibmvfc_event *evt;
4218
4219 if (vhost->discovery_threads >= disc_threads)
4220 return;
4221
4222 kref_get(&tgt->kref);
4223 tgt->logo_rcvd = 0;
4224 evt = ibmvfc_get_reserved_event(&vhost->crq);
4225 if (!evt) {
4226 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4227 kref_put(&tgt->kref, ibmvfc_release_tgt);
4228 __ibmvfc_reset_host(vhost);
4229 return;
4230 }
4231 vhost->discovery_threads++;
4232 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4233 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4234 evt->tgt = tgt;
4235 plogi = &evt->iu.plogi;
4236 memset(plogi, 0, sizeof(*plogi));
4237 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4238 plogi->common.version = cpu_to_be32(2);
4239 plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4240 } else {
4241 plogi->common.version = cpu_to_be32(1);
4242 }
4243 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4244 plogi->common.length = cpu_to_be16(sizeof(*plogi));
4245 plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4246
4247 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4248 vhost->discovery_threads--;
4249 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4250 kref_put(&tgt->kref, ibmvfc_release_tgt);
4251 } else
4252 tgt_dbg(tgt, "Sent port login\n");
4253 }
4254
4255 /**
4256 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4257 * @evt: ibmvfc event struct
4258 *
4259 **/
ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event * evt)4260 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4261 {
4262 struct ibmvfc_target *tgt = evt->tgt;
4263 struct ibmvfc_host *vhost = evt->vhost;
4264 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4265 u32 status = be16_to_cpu(rsp->common.status);
4266
4267 vhost->discovery_threads--;
4268 ibmvfc_free_event(evt);
4269 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4270
4271 switch (status) {
4272 case IBMVFC_MAD_SUCCESS:
4273 tgt_dbg(tgt, "Implicit Logout succeeded\n");
4274 break;
4275 case IBMVFC_MAD_DRIVER_FAILED:
4276 kref_put(&tgt->kref, ibmvfc_release_tgt);
4277 wake_up(&vhost->work_wait_q);
4278 return;
4279 case IBMVFC_MAD_FAILED:
4280 default:
4281 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4282 break;
4283 }
4284
4285 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
4286 kref_put(&tgt->kref, ibmvfc_release_tgt);
4287 wake_up(&vhost->work_wait_q);
4288 }
4289
4290 /**
4291 * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4292 * @tgt: ibmvfc target struct
4293 * @done: Routine to call when the event is responded to
4294 *
4295 * Returns:
4296 * Allocated and initialized ibmvfc_event struct
4297 **/
__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target * tgt,void (* done)(struct ibmvfc_event *))4298 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4299 void (*done) (struct ibmvfc_event *))
4300 {
4301 struct ibmvfc_implicit_logout *mad;
4302 struct ibmvfc_host *vhost = tgt->vhost;
4303 struct ibmvfc_event *evt;
4304
4305 kref_get(&tgt->kref);
4306 evt = ibmvfc_get_reserved_event(&vhost->crq);
4307 if (!evt)
4308 return NULL;
4309 ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT);
4310 evt->tgt = tgt;
4311 mad = &evt->iu.implicit_logout;
4312 memset(mad, 0, sizeof(*mad));
4313 mad->common.version = cpu_to_be32(1);
4314 mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4315 mad->common.length = cpu_to_be16(sizeof(*mad));
4316 mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4317 return evt;
4318 }
4319
4320 /**
4321 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4322 * @tgt: ibmvfc target struct
4323 *
4324 **/
ibmvfc_tgt_implicit_logout(struct ibmvfc_target * tgt)4325 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4326 {
4327 struct ibmvfc_host *vhost = tgt->vhost;
4328 struct ibmvfc_event *evt;
4329
4330 if (vhost->discovery_threads >= disc_threads)
4331 return;
4332
4333 vhost->discovery_threads++;
4334 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4335 ibmvfc_tgt_implicit_logout_done);
4336 if (!evt) {
4337 vhost->discovery_threads--;
4338 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4339 kref_put(&tgt->kref, ibmvfc_release_tgt);
4340 __ibmvfc_reset_host(vhost);
4341 return;
4342 }
4343
4344 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4345 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4346 vhost->discovery_threads--;
4347 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4348 kref_put(&tgt->kref, ibmvfc_release_tgt);
4349 } else
4350 tgt_dbg(tgt, "Sent Implicit Logout\n");
4351 }
4352
4353 /**
4354 * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4355 * @evt: ibmvfc event struct
4356 *
4357 **/
ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event * evt)4358 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4359 {
4360 struct ibmvfc_target *tgt = evt->tgt;
4361 struct ibmvfc_host *vhost = evt->vhost;
4362 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4363 u32 status = be16_to_cpu(mad->common.status);
4364
4365 vhost->discovery_threads--;
4366 ibmvfc_free_event(evt);
4367
4368 /*
4369 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4370 * driver in which case we need to free up all the targets. If we are
4371 * not unloading, we will still go through a hard reset to get out of
4372 * offline state, so there is no need to track the old targets in that
4373 * case.
4374 */
4375 if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4376 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4377 else
4378 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4379
4380 tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4381 kref_put(&tgt->kref, ibmvfc_release_tgt);
4382 wake_up(&vhost->work_wait_q);
4383 }
4384
4385 /**
4386 * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4387 * @tgt: ibmvfc target struct
4388 *
4389 **/
ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target * tgt)4390 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4391 {
4392 struct ibmvfc_host *vhost = tgt->vhost;
4393 struct ibmvfc_event *evt;
4394
4395 if (!vhost->logged_in) {
4396 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4397 return;
4398 }
4399
4400 if (vhost->discovery_threads >= disc_threads)
4401 return;
4402
4403 vhost->discovery_threads++;
4404 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4405 ibmvfc_tgt_implicit_logout_and_del_done);
4406
4407 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4408 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4409 vhost->discovery_threads--;
4410 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4411 kref_put(&tgt->kref, ibmvfc_release_tgt);
4412 } else
4413 tgt_dbg(tgt, "Sent Implicit Logout\n");
4414 }
4415
4416 /**
4417 * ibmvfc_tgt_move_login_done - Completion handler for Move Login
4418 * @evt: ibmvfc event struct
4419 *
4420 **/
ibmvfc_tgt_move_login_done(struct ibmvfc_event * evt)4421 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4422 {
4423 struct ibmvfc_target *tgt = evt->tgt;
4424 struct ibmvfc_host *vhost = evt->vhost;
4425 struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4426 u32 status = be16_to_cpu(rsp->common.status);
4427 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4428
4429 vhost->discovery_threads--;
4430 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4431 switch (status) {
4432 case IBMVFC_MAD_SUCCESS:
4433 tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4434 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4435 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4436 tgt->scsi_id = tgt->new_scsi_id;
4437 tgt->ids.port_id = tgt->scsi_id;
4438 memcpy(&tgt->service_parms, &rsp->service_parms,
4439 sizeof(tgt->service_parms));
4440 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4441 sizeof(tgt->service_parms_change));
4442 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4443 break;
4444 case IBMVFC_MAD_DRIVER_FAILED:
4445 break;
4446 case IBMVFC_MAD_CRQ_ERROR:
4447 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4448 break;
4449 case IBMVFC_MAD_FAILED:
4450 default:
4451 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4452
4453 tgt_log(tgt, level,
4454 "Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4455 tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4456 status);
4457 break;
4458 }
4459
4460 kref_put(&tgt->kref, ibmvfc_release_tgt);
4461 ibmvfc_free_event(evt);
4462 wake_up(&vhost->work_wait_q);
4463 }
4464
4465
4466 /**
4467 * ibmvfc_tgt_move_login - Initiate a move login for specified target
4468 * @tgt: ibmvfc target struct
4469 *
4470 **/
ibmvfc_tgt_move_login(struct ibmvfc_target * tgt)4471 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4472 {
4473 struct ibmvfc_host *vhost = tgt->vhost;
4474 struct ibmvfc_move_login *move;
4475 struct ibmvfc_event *evt;
4476
4477 if (vhost->discovery_threads >= disc_threads)
4478 return;
4479
4480 kref_get(&tgt->kref);
4481 evt = ibmvfc_get_reserved_event(&vhost->crq);
4482 if (!evt) {
4483 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4484 kref_put(&tgt->kref, ibmvfc_release_tgt);
4485 __ibmvfc_reset_host(vhost);
4486 return;
4487 }
4488 vhost->discovery_threads++;
4489 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4490 ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT);
4491 evt->tgt = tgt;
4492 move = &evt->iu.move_login;
4493 memset(move, 0, sizeof(*move));
4494 move->common.version = cpu_to_be32(1);
4495 move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4496 move->common.length = cpu_to_be16(sizeof(*move));
4497
4498 move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4499 move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4500 move->wwpn = cpu_to_be64(tgt->wwpn);
4501 move->node_name = cpu_to_be64(tgt->ids.node_name);
4502
4503 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4504 vhost->discovery_threads--;
4505 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4506 kref_put(&tgt->kref, ibmvfc_release_tgt);
4507 } else
4508 tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4509 }
4510
4511 /**
4512 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4513 * @mad: ibmvfc passthru mad struct
4514 * @tgt: ibmvfc target struct
4515 *
4516 * Returns:
4517 * 1 if PLOGI needed / 0 if PLOGI not needed
4518 **/
ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad * mad,struct ibmvfc_target * tgt)4519 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4520 struct ibmvfc_target *tgt)
4521 {
4522 if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4523 return 1;
4524 if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4525 return 1;
4526 if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4527 return 1;
4528 return 0;
4529 }
4530
4531 /**
4532 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
4533 * @evt: ibmvfc event struct
4534 *
4535 **/
ibmvfc_tgt_adisc_done(struct ibmvfc_event * evt)4536 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4537 {
4538 struct ibmvfc_target *tgt = evt->tgt;
4539 struct ibmvfc_host *vhost = evt->vhost;
4540 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4541 u32 status = be16_to_cpu(mad->common.status);
4542 u8 fc_reason, fc_explain;
4543
4544 vhost->discovery_threads--;
4545 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4546 timer_delete(&tgt->timer);
4547
4548 switch (status) {
4549 case IBMVFC_MAD_SUCCESS:
4550 tgt_dbg(tgt, "ADISC succeeded\n");
4551 if (ibmvfc_adisc_needs_plogi(mad, tgt))
4552 ibmvfc_del_tgt(tgt);
4553 break;
4554 case IBMVFC_MAD_DRIVER_FAILED:
4555 break;
4556 case IBMVFC_MAD_FAILED:
4557 default:
4558 ibmvfc_del_tgt(tgt);
4559 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4560 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4561 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4562 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4563 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4564 ibmvfc_get_fc_type(fc_reason), fc_reason,
4565 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4566 break;
4567 }
4568
4569 kref_put(&tgt->kref, ibmvfc_release_tgt);
4570 ibmvfc_free_event(evt);
4571 wake_up(&vhost->work_wait_q);
4572 }
4573
4574 /**
4575 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
4576 * @evt: ibmvfc event struct
4577 *
4578 **/
ibmvfc_init_passthru(struct ibmvfc_event * evt)4579 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4580 {
4581 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4582
4583 memset(mad, 0, sizeof(*mad));
4584 mad->common.version = cpu_to_be32(1);
4585 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4586 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4587 mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4588 offsetof(struct ibmvfc_passthru_mad, iu));
4589 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4590 mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4591 mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4592 mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4593 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4594 offsetof(struct ibmvfc_passthru_fc_iu, payload));
4595 mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4596 mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4597 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4598 offsetof(struct ibmvfc_passthru_fc_iu, response));
4599 mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4600 }
4601
4602 /**
4603 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4604 * @evt: ibmvfc event struct
4605 *
4606 * Just cleanup this event struct. Everything else is handled by
4607 * the ADISC completion handler. If the ADISC never actually comes
4608 * back, we still have the timer running on the ADISC event struct
4609 * which will fire and cause the CRQ to get reset.
4610 *
4611 **/
ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event * evt)4612 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4613 {
4614 struct ibmvfc_host *vhost = evt->vhost;
4615 struct ibmvfc_target *tgt = evt->tgt;
4616
4617 tgt_dbg(tgt, "ADISC cancel complete\n");
4618 vhost->abort_threads--;
4619 ibmvfc_free_event(evt);
4620 kref_put(&tgt->kref, ibmvfc_release_tgt);
4621 wake_up(&vhost->work_wait_q);
4622 }
4623
4624 /**
4625 * ibmvfc_adisc_timeout - Handle an ADISC timeout
4626 * @t: ibmvfc target struct
4627 *
4628 * If an ADISC times out, send a cancel. If the cancel times
4629 * out, reset the CRQ. When the ADISC comes back as cancelled,
4630 * log back into the target.
4631 **/
ibmvfc_adisc_timeout(struct timer_list * t)4632 static void ibmvfc_adisc_timeout(struct timer_list *t)
4633 {
4634 struct ibmvfc_target *tgt = timer_container_of(tgt, t, timer);
4635 struct ibmvfc_host *vhost = tgt->vhost;
4636 struct ibmvfc_event *evt;
4637 struct ibmvfc_tmf *tmf;
4638 unsigned long flags;
4639 int rc;
4640
4641 tgt_dbg(tgt, "ADISC timeout\n");
4642 spin_lock_irqsave(vhost->host->host_lock, flags);
4643 if (vhost->abort_threads >= disc_threads ||
4644 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4645 vhost->state != IBMVFC_INITIALIZING ||
4646 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4647 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4648 return;
4649 }
4650
4651 vhost->abort_threads++;
4652 kref_get(&tgt->kref);
4653 evt = ibmvfc_get_reserved_event(&vhost->crq);
4654 if (!evt) {
4655 tgt_err(tgt, "Failed to get cancel event for ADISC.\n");
4656 vhost->abort_threads--;
4657 kref_put(&tgt->kref, ibmvfc_release_tgt);
4658 __ibmvfc_reset_host(vhost);
4659 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4660 return;
4661 }
4662 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
4663
4664 evt->tgt = tgt;
4665 tmf = &evt->iu.tmf;
4666 memset(tmf, 0, sizeof(*tmf));
4667 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4668 tmf->common.version = cpu_to_be32(2);
4669 tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4670 } else {
4671 tmf->common.version = cpu_to_be32(1);
4672 }
4673 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4674 tmf->common.length = cpu_to_be16(sizeof(*tmf));
4675 tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4676 tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4677
4678 rc = ibmvfc_send_event(evt, vhost, default_timeout);
4679
4680 if (rc) {
4681 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4682 vhost->abort_threads--;
4683 kref_put(&tgt->kref, ibmvfc_release_tgt);
4684 __ibmvfc_reset_host(vhost);
4685 } else
4686 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4687 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4688 }
4689
4690 /**
4691 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4692 * @tgt: ibmvfc target struct
4693 *
4694 * When sending an ADISC we end up with two timers running. The
4695 * first timer is the timer in the ibmvfc target struct. If this
4696 * fires, we send a cancel to the target. The second timer is the
4697 * timer on the ibmvfc event for the ADISC, which is longer. If that
4698 * fires, it means the ADISC timed out and our attempt to cancel it
4699 * also failed, so we need to reset the CRQ.
4700 **/
ibmvfc_tgt_adisc(struct ibmvfc_target * tgt)4701 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4702 {
4703 struct ibmvfc_passthru_mad *mad;
4704 struct ibmvfc_host *vhost = tgt->vhost;
4705 struct ibmvfc_event *evt;
4706
4707 if (vhost->discovery_threads >= disc_threads)
4708 return;
4709
4710 kref_get(&tgt->kref);
4711 evt = ibmvfc_get_reserved_event(&vhost->crq);
4712 if (!evt) {
4713 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4714 kref_put(&tgt->kref, ibmvfc_release_tgt);
4715 __ibmvfc_reset_host(vhost);
4716 return;
4717 }
4718 vhost->discovery_threads++;
4719 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
4720 evt->tgt = tgt;
4721
4722 ibmvfc_init_passthru(evt);
4723 mad = &evt->iu.passthru;
4724 mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4725 mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4726 mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4727
4728 mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4729 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4730 sizeof(vhost->login_buf->resp.port_name));
4731 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4732 sizeof(vhost->login_buf->resp.node_name));
4733 mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4734
4735 if (timer_pending(&tgt->timer))
4736 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4737 else {
4738 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4739 add_timer(&tgt->timer);
4740 }
4741
4742 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4743 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4744 vhost->discovery_threads--;
4745 timer_delete(&tgt->timer);
4746 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4747 kref_put(&tgt->kref, ibmvfc_release_tgt);
4748 } else
4749 tgt_dbg(tgt, "Sent ADISC\n");
4750 }
4751
4752 /**
4753 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4754 * @evt: ibmvfc event struct
4755 *
4756 **/
ibmvfc_tgt_query_target_done(struct ibmvfc_event * evt)4757 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4758 {
4759 struct ibmvfc_target *tgt = evt->tgt;
4760 struct ibmvfc_host *vhost = evt->vhost;
4761 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4762 u32 status = be16_to_cpu(rsp->common.status);
4763 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4764
4765 vhost->discovery_threads--;
4766 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4767 switch (status) {
4768 case IBMVFC_MAD_SUCCESS:
4769 tgt_dbg(tgt, "Query Target succeeded\n");
4770 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4771 ibmvfc_del_tgt(tgt);
4772 else
4773 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
4774 break;
4775 case IBMVFC_MAD_DRIVER_FAILED:
4776 break;
4777 case IBMVFC_MAD_CRQ_ERROR:
4778 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4779 break;
4780 case IBMVFC_MAD_FAILED:
4781 default:
4782 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4783 be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4784 be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4785 ibmvfc_del_tgt(tgt);
4786 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4787 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4788 else
4789 ibmvfc_del_tgt(tgt);
4790
4791 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4792 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4793 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4794 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4795 ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4796 status);
4797 break;
4798 }
4799
4800 kref_put(&tgt->kref, ibmvfc_release_tgt);
4801 ibmvfc_free_event(evt);
4802 wake_up(&vhost->work_wait_q);
4803 }
4804
4805 /**
4806 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4807 * @tgt: ibmvfc target struct
4808 *
4809 **/
ibmvfc_tgt_query_target(struct ibmvfc_target * tgt)4810 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4811 {
4812 struct ibmvfc_query_tgt *query_tgt;
4813 struct ibmvfc_host *vhost = tgt->vhost;
4814 struct ibmvfc_event *evt;
4815
4816 if (vhost->discovery_threads >= disc_threads)
4817 return;
4818
4819 kref_get(&tgt->kref);
4820 evt = ibmvfc_get_reserved_event(&vhost->crq);
4821 if (!evt) {
4822 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4823 kref_put(&tgt->kref, ibmvfc_release_tgt);
4824 __ibmvfc_reset_host(vhost);
4825 return;
4826 }
4827 vhost->discovery_threads++;
4828 evt->tgt = tgt;
4829 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
4830 query_tgt = &evt->iu.query_tgt;
4831 memset(query_tgt, 0, sizeof(*query_tgt));
4832 query_tgt->common.version = cpu_to_be32(1);
4833 query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4834 query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4835 query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4836
4837 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4838 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4839 vhost->discovery_threads--;
4840 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4841 kref_put(&tgt->kref, ibmvfc_release_tgt);
4842 } else
4843 tgt_dbg(tgt, "Sent Query Target\n");
4844 }
4845
4846 /**
4847 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4848 * @vhost: ibmvfc host struct
4849 * @target: Holds SCSI ID to allocate target forand the WWPN
4850 *
4851 * Returns:
4852 * 0 on success / other on failure
4853 **/
ibmvfc_alloc_target(struct ibmvfc_host * vhost,struct ibmvfc_discover_targets_entry * target)4854 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4855 struct ibmvfc_discover_targets_entry *target)
4856 {
4857 struct ibmvfc_target *stgt = NULL;
4858 struct ibmvfc_target *wtgt = NULL;
4859 struct ibmvfc_target *tgt;
4860 unsigned long flags;
4861 u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4862 u64 wwpn = be64_to_cpu(target->wwpn);
4863
4864 /* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4865 spin_lock_irqsave(vhost->host->host_lock, flags);
4866 list_for_each_entry(tgt, &vhost->targets, queue) {
4867 if (tgt->wwpn == wwpn) {
4868 wtgt = tgt;
4869 break;
4870 }
4871 }
4872
4873 list_for_each_entry(tgt, &vhost->targets, queue) {
4874 if (tgt->scsi_id == scsi_id) {
4875 stgt = tgt;
4876 break;
4877 }
4878 }
4879
4880 if (wtgt && !stgt) {
4881 /*
4882 * A WWPN target has moved and we still are tracking the old
4883 * SCSI ID. The only way we should be able to get here is if
4884 * we attempted to send an implicit logout for the old SCSI ID
4885 * and it failed for some reason, such as there being I/O
4886 * pending to the target. In this case, we will have already
4887 * deleted the rport from the FC transport so we do a move
4888 * login, which works even with I/O pending, however, if
4889 * there is still I/O pending, it will stay outstanding, so
4890 * we only do this if fast fail is disabled for the rport,
4891 * otherwise we let terminate_rport_io clean up the port
4892 * before we login at the new location.
4893 */
4894 if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4895 if (wtgt->move_login) {
4896 /*
4897 * Do a move login here. The old target is no longer
4898 * known to the transport layer We don't use the
4899 * normal ibmvfc_set_tgt_action to set this, as we
4900 * don't normally want to allow this state change.
4901 */
4902 wtgt->new_scsi_id = scsi_id;
4903 wtgt->action = IBMVFC_TGT_ACTION_INIT;
4904 wtgt->init_retries = 0;
4905 ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login);
4906 }
4907 goto unlock_out;
4908 } else {
4909 tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4910 wtgt->action, wtgt->rport);
4911 }
4912 } else if (stgt) {
4913 if (tgt->need_login)
4914 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4915 goto unlock_out;
4916 }
4917 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4918
4919 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
4920 memset(tgt, 0, sizeof(*tgt));
4921 tgt->scsi_id = scsi_id;
4922 tgt->wwpn = wwpn;
4923 tgt->vhost = vhost;
4924 tgt->need_login = 1;
4925 timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4926 kref_init(&tgt->kref);
4927 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4928 spin_lock_irqsave(vhost->host->host_lock, flags);
4929 tgt->cancel_key = vhost->task_set++;
4930 list_add_tail(&tgt->queue, &vhost->targets);
4931
4932 unlock_out:
4933 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4934 return 0;
4935 }
4936
4937 /**
4938 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4939 * @vhost: ibmvfc host struct
4940 *
4941 * Returns:
4942 * 0 on success / other on failure
4943 **/
ibmvfc_alloc_targets(struct ibmvfc_host * vhost)4944 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4945 {
4946 int i, rc;
4947
4948 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4949 rc = ibmvfc_alloc_target(vhost, &vhost->scsi_scrqs.disc_buf[i]);
4950
4951 return rc;
4952 }
4953
4954 /**
4955 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4956 * @evt: ibmvfc event struct
4957 *
4958 **/
ibmvfc_discover_targets_done(struct ibmvfc_event * evt)4959 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4960 {
4961 struct ibmvfc_host *vhost = evt->vhost;
4962 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4963 u32 mad_status = be16_to_cpu(rsp->common.status);
4964 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4965
4966 switch (mad_status) {
4967 case IBMVFC_MAD_SUCCESS:
4968 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4969 vhost->num_targets = be32_to_cpu(rsp->num_written);
4970 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4971 break;
4972 case IBMVFC_MAD_FAILED:
4973 level += ibmvfc_retry_host_init(vhost);
4974 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4975 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4976 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4977 break;
4978 case IBMVFC_MAD_DRIVER_FAILED:
4979 break;
4980 default:
4981 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4982 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4983 break;
4984 }
4985
4986 ibmvfc_free_event(evt);
4987 wake_up(&vhost->work_wait_q);
4988 }
4989
4990 /**
4991 * ibmvfc_discover_targets - Send Discover Targets MAD
4992 * @vhost: ibmvfc host struct
4993 *
4994 **/
ibmvfc_discover_targets(struct ibmvfc_host * vhost)4995 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4996 {
4997 struct ibmvfc_discover_targets *mad;
4998 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
4999 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5000
5001 if (!evt) {
5002 ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n");
5003 ibmvfc_hard_reset_host(vhost);
5004 return;
5005 }
5006
5007 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
5008 mad = &evt->iu.discover_targets;
5009 memset(mad, 0, sizeof(*mad));
5010 mad->common.version = cpu_to_be32(1);
5011 mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
5012 mad->common.length = cpu_to_be16(sizeof(*mad));
5013 mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5014 mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma);
5015 mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5016 mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
5017 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5018
5019 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5020 ibmvfc_dbg(vhost, "Sent discover targets\n");
5021 else
5022 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5023 }
5024
ibmvfc_channel_setup_done(struct ibmvfc_event * evt)5025 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
5026 {
5027 struct ibmvfc_host *vhost = evt->vhost;
5028 struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
5029 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5030 u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
5031 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5032 int flags, active_queues, i;
5033
5034 ibmvfc_free_event(evt);
5035
5036 switch (mad_status) {
5037 case IBMVFC_MAD_SUCCESS:
5038 ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
5039 flags = be32_to_cpu(setup->flags);
5040 vhost->do_enquiry = 0;
5041 active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
5042 scrqs->active_queues = active_queues;
5043
5044 if (flags & IBMVFC_CHANNELS_CANCELED) {
5045 ibmvfc_dbg(vhost, "Channels Canceled\n");
5046 vhost->using_channels = 0;
5047 } else {
5048 if (active_queues)
5049 vhost->using_channels = 1;
5050 for (i = 0; i < active_queues; i++)
5051 scrqs->scrqs[i].vios_cookie =
5052 be64_to_cpu(setup->channel_handles[i]);
5053
5054 ibmvfc_dbg(vhost, "Using %u channels\n",
5055 vhost->scsi_scrqs.active_queues);
5056 }
5057 break;
5058 case IBMVFC_MAD_FAILED:
5059 level += ibmvfc_retry_host_init(vhost);
5060 ibmvfc_log(vhost, level, "Channel Setup failed\n");
5061 fallthrough;
5062 case IBMVFC_MAD_DRIVER_FAILED:
5063 return;
5064 default:
5065 dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
5066 mad_status);
5067 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5068 return;
5069 }
5070
5071 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5072 wake_up(&vhost->work_wait_q);
5073 }
5074
ibmvfc_channel_setup(struct ibmvfc_host * vhost)5075 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
5076 {
5077 struct ibmvfc_channel_setup_mad *mad;
5078 struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
5079 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5080 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5081 unsigned int num_channels =
5082 min(scrqs->desired_queues, vhost->max_vios_scsi_channels);
5083 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5084 int i;
5085
5086 if (!evt) {
5087 ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n");
5088 ibmvfc_hard_reset_host(vhost);
5089 return;
5090 }
5091
5092 memset(setup_buf, 0, sizeof(*setup_buf));
5093 if (num_channels == 0)
5094 setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
5095 else {
5096 setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
5097 for (i = 0; i < num_channels; i++)
5098 setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
5099 }
5100
5101 ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
5102 mad = &evt->iu.channel_setup;
5103 memset(mad, 0, sizeof(*mad));
5104 mad->common.version = cpu_to_be32(1);
5105 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
5106 mad->common.length = cpu_to_be16(sizeof(*mad));
5107 mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
5108 mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
5109
5110 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5111
5112 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5113 ibmvfc_dbg(vhost, "Sent channel setup\n");
5114 else
5115 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
5116 }
5117
ibmvfc_channel_enquiry_done(struct ibmvfc_event * evt)5118 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
5119 {
5120 struct ibmvfc_host *vhost = evt->vhost;
5121 struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
5122 u32 mad_status = be16_to_cpu(rsp->common.status);
5123 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5124
5125 switch (mad_status) {
5126 case IBMVFC_MAD_SUCCESS:
5127 ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
5128 vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
5129 ibmvfc_free_event(evt);
5130 break;
5131 case IBMVFC_MAD_FAILED:
5132 level += ibmvfc_retry_host_init(vhost);
5133 ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
5134 fallthrough;
5135 case IBMVFC_MAD_DRIVER_FAILED:
5136 ibmvfc_free_event(evt);
5137 return;
5138 default:
5139 dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
5140 mad_status);
5141 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5142 ibmvfc_free_event(evt);
5143 return;
5144 }
5145
5146 ibmvfc_channel_setup(vhost);
5147 }
5148
ibmvfc_channel_enquiry(struct ibmvfc_host * vhost)5149 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5150 {
5151 struct ibmvfc_channel_enquiry *mad;
5152 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5153 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5154
5155 if (!evt) {
5156 ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n");
5157 ibmvfc_hard_reset_host(vhost);
5158 return;
5159 }
5160
5161 ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT);
5162 mad = &evt->iu.channel_enquiry;
5163 memset(mad, 0, sizeof(*mad));
5164 mad->common.version = cpu_to_be32(1);
5165 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5166 mad->common.length = cpu_to_be16(sizeof(*mad));
5167
5168 if (mig_channels_only)
5169 mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5170 if (mig_no_less_channels)
5171 mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5172
5173 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5174
5175 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5176 ibmvfc_dbg(vhost, "Send channel enquiry\n");
5177 else
5178 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5179 }
5180
5181 /**
5182 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
5183 * @evt: ibmvfc event struct
5184 *
5185 **/
ibmvfc_npiv_login_done(struct ibmvfc_event * evt)5186 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5187 {
5188 struct ibmvfc_host *vhost = evt->vhost;
5189 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5190 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5191 unsigned int npiv_max_sectors;
5192 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5193
5194 switch (mad_status) {
5195 case IBMVFC_MAD_SUCCESS:
5196 ibmvfc_free_event(evt);
5197 break;
5198 case IBMVFC_MAD_FAILED:
5199 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5200 level += ibmvfc_retry_host_init(vhost);
5201 else
5202 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5203 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5204 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5205 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5206 ibmvfc_free_event(evt);
5207 return;
5208 case IBMVFC_MAD_CRQ_ERROR:
5209 ibmvfc_retry_host_init(vhost);
5210 fallthrough;
5211 case IBMVFC_MAD_DRIVER_FAILED:
5212 ibmvfc_free_event(evt);
5213 return;
5214 default:
5215 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5216 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5217 ibmvfc_free_event(evt);
5218 return;
5219 }
5220
5221 vhost->client_migrated = 0;
5222
5223 if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5224 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5225 rsp->flags);
5226 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5227 wake_up(&vhost->work_wait_q);
5228 return;
5229 }
5230
5231 if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5232 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5233 rsp->max_cmds);
5234 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5235 wake_up(&vhost->work_wait_q);
5236 return;
5237 }
5238
5239 vhost->logged_in = 1;
5240 npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), max_sectors);
5241 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5242 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5243 rsp->drc_name, npiv_max_sectors);
5244
5245 fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5246 fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5247 fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5248 fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5249 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5250 fc_host_supported_classes(vhost->host) = 0;
5251 if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5252 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5253 if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5254 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5255 if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5256 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5257 fc_host_maxframe_size(vhost->host) =
5258 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5259
5260 vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5261 vhost->host->max_sectors = npiv_max_sectors;
5262
5263 if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5264 ibmvfc_channel_enquiry(vhost);
5265 } else {
5266 vhost->do_enquiry = 0;
5267 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5268 wake_up(&vhost->work_wait_q);
5269 }
5270 }
5271
5272 /**
5273 * ibmvfc_npiv_login - Sends NPIV login
5274 * @vhost: ibmvfc host struct
5275 *
5276 **/
ibmvfc_npiv_login(struct ibmvfc_host * vhost)5277 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5278 {
5279 struct ibmvfc_npiv_login_mad *mad;
5280 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5281
5282 if (!evt) {
5283 ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n");
5284 ibmvfc_hard_reset_host(vhost);
5285 return;
5286 }
5287
5288 ibmvfc_gather_partition_info(vhost);
5289 ibmvfc_set_login_info(vhost);
5290 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
5291
5292 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5293 mad = &evt->iu.npiv_login;
5294 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5295 mad->common.version = cpu_to_be32(1);
5296 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5297 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5298 mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5299 mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5300
5301 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5302
5303 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5304 ibmvfc_dbg(vhost, "Sent NPIV login\n");
5305 else
5306 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5307 }
5308
5309 /**
5310 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5311 * @evt: ibmvfc event struct
5312 *
5313 **/
ibmvfc_npiv_logout_done(struct ibmvfc_event * evt)5314 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5315 {
5316 struct ibmvfc_host *vhost = evt->vhost;
5317 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5318
5319 ibmvfc_free_event(evt);
5320
5321 switch (mad_status) {
5322 case IBMVFC_MAD_SUCCESS:
5323 if (list_empty(&vhost->crq.sent) &&
5324 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5325 ibmvfc_init_host(vhost);
5326 return;
5327 }
5328 break;
5329 case IBMVFC_MAD_FAILED:
5330 case IBMVFC_MAD_NOT_SUPPORTED:
5331 case IBMVFC_MAD_CRQ_ERROR:
5332 case IBMVFC_MAD_DRIVER_FAILED:
5333 default:
5334 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5335 break;
5336 }
5337
5338 ibmvfc_hard_reset_host(vhost);
5339 }
5340
5341 /**
5342 * ibmvfc_npiv_logout - Issue an NPIV Logout
5343 * @vhost: ibmvfc host struct
5344 *
5345 **/
ibmvfc_npiv_logout(struct ibmvfc_host * vhost)5346 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5347 {
5348 struct ibmvfc_npiv_logout_mad *mad;
5349 struct ibmvfc_event *evt;
5350
5351 evt = ibmvfc_get_reserved_event(&vhost->crq);
5352 if (!evt) {
5353 ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n");
5354 ibmvfc_hard_reset_host(vhost);
5355 return;
5356 }
5357
5358 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
5359
5360 mad = &evt->iu.npiv_logout;
5361 memset(mad, 0, sizeof(*mad));
5362 mad->common.version = cpu_to_be32(1);
5363 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5364 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5365
5366 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
5367
5368 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5369 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5370 else
5371 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5372 }
5373
5374 /**
5375 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
5376 * @vhost: ibmvfc host struct
5377 *
5378 * Returns:
5379 * 1 if work to do / 0 if not
5380 **/
ibmvfc_dev_init_to_do(struct ibmvfc_host * vhost)5381 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5382 {
5383 struct ibmvfc_target *tgt;
5384
5385 list_for_each_entry(tgt, &vhost->targets, queue) {
5386 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5387 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5388 return 1;
5389 }
5390
5391 return 0;
5392 }
5393
5394 /**
5395 * ibmvfc_dev_logo_to_do - Is there target logout work to do?
5396 * @vhost: ibmvfc host struct
5397 *
5398 * Returns:
5399 * 1 if work to do / 0 if not
5400 **/
ibmvfc_dev_logo_to_do(struct ibmvfc_host * vhost)5401 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5402 {
5403 struct ibmvfc_target *tgt;
5404
5405 list_for_each_entry(tgt, &vhost->targets, queue) {
5406 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5407 tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5408 return 1;
5409 }
5410 return 0;
5411 }
5412
5413 /**
5414 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5415 * @vhost: ibmvfc host struct
5416 *
5417 * Returns:
5418 * 1 if work to do / 0 if not
5419 **/
__ibmvfc_work_to_do(struct ibmvfc_host * vhost)5420 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5421 {
5422 struct ibmvfc_target *tgt;
5423
5424 if (kthread_should_stop())
5425 return 1;
5426 switch (vhost->action) {
5427 case IBMVFC_HOST_ACTION_NONE:
5428 case IBMVFC_HOST_ACTION_INIT_WAIT:
5429 case IBMVFC_HOST_ACTION_LOGO_WAIT:
5430 return 0;
5431 case IBMVFC_HOST_ACTION_TGT_INIT:
5432 case IBMVFC_HOST_ACTION_QUERY_TGTS:
5433 if (vhost->discovery_threads == disc_threads)
5434 return 0;
5435 list_for_each_entry(tgt, &vhost->targets, queue)
5436 if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5437 return 1;
5438 list_for_each_entry(tgt, &vhost->targets, queue)
5439 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5440 return 0;
5441 return 1;
5442 case IBMVFC_HOST_ACTION_TGT_DEL:
5443 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5444 if (vhost->discovery_threads == disc_threads)
5445 return 0;
5446 list_for_each_entry(tgt, &vhost->targets, queue)
5447 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5448 return 1;
5449 list_for_each_entry(tgt, &vhost->targets, queue)
5450 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5451 return 0;
5452 return 1;
5453 case IBMVFC_HOST_ACTION_LOGO:
5454 case IBMVFC_HOST_ACTION_INIT:
5455 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5456 case IBMVFC_HOST_ACTION_QUERY:
5457 case IBMVFC_HOST_ACTION_RESET:
5458 case IBMVFC_HOST_ACTION_REENABLE:
5459 default:
5460 break;
5461 }
5462
5463 return 1;
5464 }
5465
5466 /**
5467 * ibmvfc_work_to_do - Is there task level work to do?
5468 * @vhost: ibmvfc host struct
5469 *
5470 * Returns:
5471 * 1 if work to do / 0 if not
5472 **/
ibmvfc_work_to_do(struct ibmvfc_host * vhost)5473 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5474 {
5475 unsigned long flags;
5476 int rc;
5477
5478 spin_lock_irqsave(vhost->host->host_lock, flags);
5479 rc = __ibmvfc_work_to_do(vhost);
5480 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5481 return rc;
5482 }
5483
5484 /**
5485 * ibmvfc_log_ae - Log async events if necessary
5486 * @vhost: ibmvfc host struct
5487 * @events: events to log
5488 *
5489 **/
ibmvfc_log_ae(struct ibmvfc_host * vhost,int events)5490 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5491 {
5492 if (events & IBMVFC_AE_RSCN)
5493 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
5494 if ((events & IBMVFC_AE_LINKDOWN) &&
5495 vhost->state >= IBMVFC_HALTED)
5496 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
5497 if ((events & IBMVFC_AE_LINKUP) &&
5498 vhost->state == IBMVFC_INITIALIZING)
5499 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
5500 }
5501
5502 /**
5503 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5504 * @tgt: ibmvfc target struct
5505 *
5506 **/
ibmvfc_tgt_add_rport(struct ibmvfc_target * tgt)5507 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5508 {
5509 struct ibmvfc_host *vhost = tgt->vhost;
5510 struct fc_rport *rport;
5511 unsigned long flags;
5512
5513 tgt_dbg(tgt, "Adding rport\n");
5514 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
5515 spin_lock_irqsave(vhost->host->host_lock, flags);
5516
5517 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5518 tgt_dbg(tgt, "Deleting rport\n");
5519 list_del(&tgt->queue);
5520 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5521 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5522 fc_remote_port_delete(rport);
5523 timer_delete_sync(&tgt->timer);
5524 kref_put(&tgt->kref, ibmvfc_release_tgt);
5525 return;
5526 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5527 tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5528 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5529 tgt->rport = NULL;
5530 tgt->init_retries = 0;
5531 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5532 fc_remote_port_delete(rport);
5533 return;
5534 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5535 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5536 return;
5537 }
5538
5539 if (rport) {
5540 tgt_dbg(tgt, "rport add succeeded\n");
5541 tgt->rport = rport;
5542 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5543 rport->supported_classes = 0;
5544 tgt->target_id = rport->scsi_target_id;
5545 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5546 rport->supported_classes |= FC_COS_CLASS1;
5547 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5548 rport->supported_classes |= FC_COS_CLASS2;
5549 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5550 rport->supported_classes |= FC_COS_CLASS3;
5551 } else
5552 tgt_dbg(tgt, "rport add failed\n");
5553 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5554 }
5555
5556 /**
5557 * ibmvfc_do_work - Do task level work
5558 * @vhost: ibmvfc host struct
5559 *
5560 **/
ibmvfc_do_work(struct ibmvfc_host * vhost)5561 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5562 {
5563 struct ibmvfc_target *tgt;
5564 unsigned long flags;
5565 struct fc_rport *rport;
5566 LIST_HEAD(purge);
5567 int rc;
5568
5569 ibmvfc_log_ae(vhost, vhost->events_to_log);
5570 spin_lock_irqsave(vhost->host->host_lock, flags);
5571 vhost->events_to_log = 0;
5572 switch (vhost->action) {
5573 case IBMVFC_HOST_ACTION_NONE:
5574 case IBMVFC_HOST_ACTION_LOGO_WAIT:
5575 case IBMVFC_HOST_ACTION_INIT_WAIT:
5576 break;
5577 case IBMVFC_HOST_ACTION_RESET:
5578 list_splice_init(&vhost->purge, &purge);
5579 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5580 ibmvfc_complete_purge(&purge);
5581 rc = ibmvfc_reset_crq(vhost);
5582
5583 spin_lock_irqsave(vhost->host->host_lock, flags);
5584 if (!rc || rc == H_CLOSED)
5585 vio_enable_interrupts(to_vio_dev(vhost->dev));
5586 if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5587 /*
5588 * The only action we could have changed to would have
5589 * been reenable, in which case, we skip the rest of
5590 * this path and wait until we've done the re-enable
5591 * before sending the crq init.
5592 */
5593 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5594
5595 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5596 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5597 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5598 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5599 }
5600 }
5601 break;
5602 case IBMVFC_HOST_ACTION_REENABLE:
5603 list_splice_init(&vhost->purge, &purge);
5604 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5605 ibmvfc_complete_purge(&purge);
5606 rc = ibmvfc_reenable_crq_queue(vhost);
5607
5608 spin_lock_irqsave(vhost->host->host_lock, flags);
5609 if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5610 /*
5611 * The only action we could have changed to would have
5612 * been reset, in which case, we skip the rest of this
5613 * path and wait until we've done the reset before
5614 * sending the crq init.
5615 */
5616 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5617 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5618 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5619 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5620 }
5621 }
5622 break;
5623 case IBMVFC_HOST_ACTION_LOGO:
5624 vhost->job_step(vhost);
5625 break;
5626 case IBMVFC_HOST_ACTION_INIT:
5627 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5628 if (vhost->delay_init) {
5629 vhost->delay_init = 0;
5630 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5631 ssleep(15);
5632 return;
5633 } else
5634 vhost->job_step(vhost);
5635 break;
5636 case IBMVFC_HOST_ACTION_QUERY:
5637 list_for_each_entry(tgt, &vhost->targets, queue)
5638 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
5639 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
5640 break;
5641 case IBMVFC_HOST_ACTION_QUERY_TGTS:
5642 list_for_each_entry(tgt, &vhost->targets, queue) {
5643 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5644 tgt->job_step(tgt);
5645 break;
5646 }
5647 }
5648
5649 if (!ibmvfc_dev_init_to_do(vhost))
5650 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
5651 break;
5652 case IBMVFC_HOST_ACTION_TGT_DEL:
5653 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5654 list_for_each_entry(tgt, &vhost->targets, queue) {
5655 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5656 tgt->job_step(tgt);
5657 break;
5658 }
5659 }
5660
5661 if (ibmvfc_dev_logo_to_do(vhost)) {
5662 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5663 return;
5664 }
5665
5666 list_for_each_entry(tgt, &vhost->targets, queue) {
5667 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5668 tgt_dbg(tgt, "Deleting rport\n");
5669 rport = tgt->rport;
5670 tgt->rport = NULL;
5671 list_del(&tgt->queue);
5672 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5673 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5674 if (rport)
5675 fc_remote_port_delete(rport);
5676 timer_delete_sync(&tgt->timer);
5677 kref_put(&tgt->kref, ibmvfc_release_tgt);
5678 return;
5679 } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5680 tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5681 rport = tgt->rport;
5682 tgt->rport = NULL;
5683 tgt->init_retries = 0;
5684 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5685
5686 /*
5687 * If fast fail is enabled, we wait for it to fire and then clean up
5688 * the old port, since we expect the fast fail timer to clean up the
5689 * outstanding I/O faster than waiting for normal command timeouts.
5690 * However, if fast fail is disabled, any I/O outstanding to the
5691 * rport LUNs will stay outstanding indefinitely, since the EH handlers
5692 * won't get invoked for I/O's timing out. If this is a NPIV failover
5693 * scenario, the better alternative is to use the move login.
5694 */
5695 if (rport && rport->fast_io_fail_tmo == -1)
5696 tgt->move_login = 1;
5697 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5698 if (rport)
5699 fc_remote_port_delete(rport);
5700 return;
5701 }
5702 }
5703
5704 if (vhost->state == IBMVFC_INITIALIZING) {
5705 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5706 if (vhost->reinit) {
5707 vhost->reinit = 0;
5708 scsi_block_requests(vhost->host);
5709 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5710 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5711 } else {
5712 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
5713 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5714 wake_up(&vhost->init_wait_q);
5715 schedule_work(&vhost->rport_add_work_q);
5716 vhost->init_retries = 0;
5717 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5718 scsi_unblock_requests(vhost->host);
5719 }
5720
5721 return;
5722 } else {
5723 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
5724 vhost->job_step = ibmvfc_discover_targets;
5725 }
5726 } else {
5727 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5728 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5729 scsi_unblock_requests(vhost->host);
5730 wake_up(&vhost->init_wait_q);
5731 return;
5732 }
5733 break;
5734 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5735 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
5736 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5737 ibmvfc_alloc_targets(vhost);
5738 spin_lock_irqsave(vhost->host->host_lock, flags);
5739 break;
5740 case IBMVFC_HOST_ACTION_TGT_INIT:
5741 list_for_each_entry(tgt, &vhost->targets, queue) {
5742 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5743 tgt->job_step(tgt);
5744 break;
5745 }
5746 }
5747
5748 if (!ibmvfc_dev_init_to_do(vhost))
5749 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5750 break;
5751 default:
5752 break;
5753 }
5754
5755 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5756 }
5757
5758 /**
5759 * ibmvfc_work - Do task level work
5760 * @data: ibmvfc host struct
5761 *
5762 * Returns:
5763 * zero
5764 **/
ibmvfc_work(void * data)5765 static int ibmvfc_work(void *data)
5766 {
5767 struct ibmvfc_host *vhost = data;
5768 int rc;
5769
5770 set_user_nice(current, MIN_NICE);
5771
5772 while (1) {
5773 rc = wait_event_interruptible(vhost->work_wait_q,
5774 ibmvfc_work_to_do(vhost));
5775
5776 BUG_ON(rc);
5777
5778 if (kthread_should_stop())
5779 break;
5780
5781 ibmvfc_do_work(vhost);
5782 }
5783
5784 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5785 return 0;
5786 }
5787
5788 /**
5789 * ibmvfc_alloc_queue - Allocate queue
5790 * @vhost: ibmvfc host struct
5791 * @queue: ibmvfc queue to allocate
5792 * @fmt: queue format to allocate
5793 *
5794 * Returns:
5795 * 0 on success / non-zero on failure
5796 **/
ibmvfc_alloc_queue(struct ibmvfc_host * vhost,struct ibmvfc_queue * queue,enum ibmvfc_msg_fmt fmt)5797 static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5798 struct ibmvfc_queue *queue,
5799 enum ibmvfc_msg_fmt fmt)
5800 {
5801 struct device *dev = vhost->dev;
5802 size_t fmt_size;
5803
5804 ENTER;
5805 spin_lock_init(&queue->_lock);
5806 queue->q_lock = &queue->_lock;
5807
5808 switch (fmt) {
5809 case IBMVFC_CRQ_FMT:
5810 fmt_size = sizeof(*queue->msgs.crq);
5811 queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
5812 queue->evt_depth = scsi_qdepth;
5813 queue->reserved_depth = IBMVFC_NUM_INTERNAL_REQ;
5814 break;
5815 case IBMVFC_ASYNC_FMT:
5816 fmt_size = sizeof(*queue->msgs.async);
5817 break;
5818 case IBMVFC_SUB_CRQ_FMT:
5819 fmt_size = sizeof(*queue->msgs.scrq);
5820 /* We need one extra event for Cancel Commands */
5821 queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5822 queue->evt_depth = scsi_qdepth;
5823 queue->reserved_depth = IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5824 break;
5825 default:
5826 dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5827 return -EINVAL;
5828 }
5829
5830 queue->fmt = fmt;
5831 if (ibmvfc_init_event_pool(vhost, queue)) {
5832 dev_err(dev, "Couldn't initialize event pool.\n");
5833 return -ENOMEM;
5834 }
5835
5836 queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5837 if (!queue->msgs.handle)
5838 return -ENOMEM;
5839
5840 queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5841 DMA_BIDIRECTIONAL);
5842
5843 if (dma_mapping_error(dev, queue->msg_token)) {
5844 free_page((unsigned long)queue->msgs.handle);
5845 queue->msgs.handle = NULL;
5846 return -ENOMEM;
5847 }
5848
5849 queue->cur = 0;
5850 queue->size = PAGE_SIZE / fmt_size;
5851
5852 queue->vhost = vhost;
5853 return 0;
5854 }
5855
5856 /**
5857 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5858 * @vhost: ibmvfc host struct
5859 *
5860 * Allocates a page for messages, maps it for dma, and registers
5861 * the crq with the hypervisor.
5862 *
5863 * Return value:
5864 * zero on success / other on failure
5865 **/
ibmvfc_init_crq(struct ibmvfc_host * vhost)5866 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5867 {
5868 int rc, retrc = -ENOMEM;
5869 struct device *dev = vhost->dev;
5870 struct vio_dev *vdev = to_vio_dev(dev);
5871 struct ibmvfc_queue *crq = &vhost->crq;
5872
5873 ENTER;
5874 if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT))
5875 return -ENOMEM;
5876
5877 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5878 crq->msg_token, PAGE_SIZE);
5879
5880 if (rc == H_RESOURCE)
5881 /* maybe kexecing and resource is busy. try a reset */
5882 retrc = rc = ibmvfc_reset_crq(vhost);
5883
5884 if (rc == H_CLOSED)
5885 dev_warn(dev, "Partner adapter not ready\n");
5886 else if (rc) {
5887 dev_warn(dev, "Error %d opening adapter\n", rc);
5888 goto reg_crq_failed;
5889 }
5890
5891 retrc = 0;
5892
5893 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
5894
5895 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
5896 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5897 goto req_irq_failed;
5898 }
5899
5900 if ((rc = vio_enable_interrupts(vdev))) {
5901 dev_err(dev, "Error %d enabling interrupts\n", rc);
5902 goto req_irq_failed;
5903 }
5904
5905 LEAVE;
5906 return retrc;
5907
5908 req_irq_failed:
5909 tasklet_kill(&vhost->tasklet);
5910 do {
5911 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5912 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5913 reg_crq_failed:
5914 ibmvfc_free_queue(vhost, crq);
5915 return retrc;
5916 }
5917
ibmvfc_register_channel(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels,int index)5918 static int ibmvfc_register_channel(struct ibmvfc_host *vhost,
5919 struct ibmvfc_channels *channels,
5920 int index)
5921 {
5922 struct device *dev = vhost->dev;
5923 struct vio_dev *vdev = to_vio_dev(dev);
5924 struct ibmvfc_queue *scrq = &channels->scrqs[index];
5925 int rc = -ENOMEM;
5926
5927 ENTER;
5928
5929 rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
5930 &scrq->cookie, &scrq->hw_irq);
5931
5932 /* H_CLOSED indicates successful register, but no CRQ partner */
5933 if (rc && rc != H_CLOSED) {
5934 dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5935 if (rc == H_PARAMETER)
5936 dev_warn_once(dev, "Firmware may not support MQ\n");
5937 goto reg_failed;
5938 }
5939
5940 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
5941
5942 if (!scrq->irq) {
5943 rc = -EINVAL;
5944 dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5945 goto irq_failed;
5946 }
5947
5948 switch (channels->protocol) {
5949 case IBMVFC_PROTO_SCSI:
5950 snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d",
5951 vdev->unit_address, index);
5952 scrq->handler = ibmvfc_interrupt_mq;
5953 break;
5954 case IBMVFC_PROTO_NVME:
5955 snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d",
5956 vdev->unit_address, index);
5957 scrq->handler = ibmvfc_interrupt_mq;
5958 break;
5959 default:
5960 dev_err(dev, "Unknown channel protocol (%d)\n",
5961 channels->protocol);
5962 goto irq_failed;
5963 }
5964
5965 rc = request_irq(scrq->irq, scrq->handler, 0, scrq->name, scrq);
5966
5967 if (rc) {
5968 dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5969 irq_dispose_mapping(scrq->irq);
5970 goto irq_failed;
5971 }
5972
5973 scrq->hwq_id = index;
5974
5975 LEAVE;
5976 return 0;
5977
5978 irq_failed:
5979 do {
5980 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5981 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5982 reg_failed:
5983 LEAVE;
5984 return rc;
5985 }
5986
ibmvfc_deregister_channel(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels,int index)5987 static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost,
5988 struct ibmvfc_channels *channels,
5989 int index)
5990 {
5991 struct device *dev = vhost->dev;
5992 struct vio_dev *vdev = to_vio_dev(dev);
5993 struct ibmvfc_queue *scrq = &channels->scrqs[index];
5994 long rc;
5995
5996 ENTER;
5997
5998 free_irq(scrq->irq, scrq);
5999 irq_dispose_mapping(scrq->irq);
6000 scrq->irq = 0;
6001
6002 do {
6003 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
6004 scrq->cookie);
6005 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6006
6007 if (rc)
6008 dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
6009
6010 /* Clean out the queue */
6011 memset(scrq->msgs.crq, 0, PAGE_SIZE);
6012 scrq->cur = 0;
6013
6014 LEAVE;
6015 }
6016
ibmvfc_reg_sub_crqs(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6017 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost,
6018 struct ibmvfc_channels *channels)
6019 {
6020 int i, j;
6021
6022 ENTER;
6023 if (!vhost->mq_enabled || !channels->scrqs)
6024 return;
6025
6026 for (i = 0; i < channels->max_queues; i++) {
6027 if (ibmvfc_register_channel(vhost, channels, i)) {
6028 for (j = i; j > 0; j--)
6029 ibmvfc_deregister_channel(vhost, channels, j - 1);
6030 vhost->do_enquiry = 0;
6031 return;
6032 }
6033 }
6034
6035 LEAVE;
6036 }
6037
ibmvfc_dereg_sub_crqs(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6038 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost,
6039 struct ibmvfc_channels *channels)
6040 {
6041 int i;
6042
6043 ENTER;
6044 if (!vhost->mq_enabled || !channels->scrqs)
6045 return;
6046
6047 for (i = 0; i < channels->max_queues; i++)
6048 ibmvfc_deregister_channel(vhost, channels, i);
6049
6050 LEAVE;
6051 }
6052
ibmvfc_alloc_channels(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6053 static int ibmvfc_alloc_channels(struct ibmvfc_host *vhost,
6054 struct ibmvfc_channels *channels)
6055 {
6056 struct ibmvfc_queue *scrq;
6057 int i, j;
6058 int rc = 0;
6059
6060 channels->scrqs = kzalloc_objs(*channels->scrqs, channels->max_queues);
6061 if (!channels->scrqs)
6062 return -ENOMEM;
6063
6064 for (i = 0; i < channels->max_queues; i++) {
6065 scrq = &channels->scrqs[i];
6066 rc = ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT);
6067 if (rc) {
6068 for (j = i; j > 0; j--) {
6069 scrq = &channels->scrqs[j - 1];
6070 ibmvfc_free_queue(vhost, scrq);
6071 }
6072 kfree(channels->scrqs);
6073 channels->scrqs = NULL;
6074 channels->active_queues = 0;
6075 return rc;
6076 }
6077 }
6078
6079 return rc;
6080 }
6081
ibmvfc_init_sub_crqs(struct ibmvfc_host * vhost)6082 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
6083 {
6084 ENTER;
6085 if (!vhost->mq_enabled)
6086 return;
6087
6088 if (ibmvfc_alloc_channels(vhost, &vhost->scsi_scrqs)) {
6089 vhost->do_enquiry = 0;
6090 vhost->mq_enabled = 0;
6091 return;
6092 }
6093
6094 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
6095
6096 LEAVE;
6097 }
6098
ibmvfc_release_channels(struct ibmvfc_host * vhost,struct ibmvfc_channels * channels)6099 static void ibmvfc_release_channels(struct ibmvfc_host *vhost,
6100 struct ibmvfc_channels *channels)
6101 {
6102 struct ibmvfc_queue *scrq;
6103 int i;
6104
6105 if (channels->scrqs) {
6106 for (i = 0; i < channels->max_queues; i++) {
6107 scrq = &channels->scrqs[i];
6108 ibmvfc_free_queue(vhost, scrq);
6109 }
6110
6111 kfree(channels->scrqs);
6112 channels->scrqs = NULL;
6113 channels->active_queues = 0;
6114 }
6115 }
6116
ibmvfc_release_sub_crqs(struct ibmvfc_host * vhost)6117 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
6118 {
6119 ENTER;
6120 if (!vhost->scsi_scrqs.scrqs)
6121 return;
6122
6123 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
6124
6125 ibmvfc_release_channels(vhost, &vhost->scsi_scrqs);
6126 LEAVE;
6127 }
6128
ibmvfc_free_disc_buf(struct device * dev,struct ibmvfc_channels * channels)6129 static void ibmvfc_free_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6130 {
6131 dma_free_coherent(dev, channels->disc_buf_sz, channels->disc_buf,
6132 channels->disc_buf_dma);
6133 }
6134
6135 /**
6136 * ibmvfc_free_mem - Free memory for vhost
6137 * @vhost: ibmvfc host struct
6138 *
6139 * Return value:
6140 * none
6141 **/
ibmvfc_free_mem(struct ibmvfc_host * vhost)6142 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
6143 {
6144 struct ibmvfc_queue *async_q = &vhost->async_crq;
6145
6146 ENTER;
6147 mempool_destroy(vhost->tgt_pool);
6148 kfree(vhost->trace);
6149 ibmvfc_free_disc_buf(vhost->dev, &vhost->scsi_scrqs);
6150 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
6151 vhost->login_buf, vhost->login_buf_dma);
6152 dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
6153 vhost->channel_setup_buf, vhost->channel_setup_dma);
6154 dma_pool_destroy(vhost->sg_pool);
6155 ibmvfc_free_queue(vhost, async_q);
6156 LEAVE;
6157 }
6158
ibmvfc_alloc_disc_buf(struct device * dev,struct ibmvfc_channels * channels)6159 static int ibmvfc_alloc_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6160 {
6161 channels->disc_buf_sz = sizeof(*channels->disc_buf) * max_targets;
6162 channels->disc_buf = dma_alloc_coherent(dev, channels->disc_buf_sz,
6163 &channels->disc_buf_dma, GFP_KERNEL);
6164
6165 if (!channels->disc_buf) {
6166 dev_err(dev, "Couldn't allocate %s Discover Targets buffer\n",
6167 (channels->protocol == IBMVFC_PROTO_SCSI) ? "SCSI" : "NVMe");
6168 return -ENOMEM;
6169 }
6170
6171 return 0;
6172 }
6173
6174 /**
6175 * ibmvfc_alloc_mem - Allocate memory for vhost
6176 * @vhost: ibmvfc host struct
6177 *
6178 * Return value:
6179 * 0 on success / non-zero on failure
6180 **/
ibmvfc_alloc_mem(struct ibmvfc_host * vhost)6181 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
6182 {
6183 struct ibmvfc_queue *async_q = &vhost->async_crq;
6184 struct device *dev = vhost->dev;
6185
6186 ENTER;
6187 if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) {
6188 dev_err(dev, "Couldn't allocate/map async queue.\n");
6189 goto nomem;
6190 }
6191
6192 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
6193 SG_ALL * sizeof(struct srp_direct_buf),
6194 sizeof(struct srp_direct_buf), 0);
6195
6196 if (!vhost->sg_pool) {
6197 dev_err(dev, "Failed to allocate sg pool\n");
6198 goto unmap_async_crq;
6199 }
6200
6201 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
6202 &vhost->login_buf_dma, GFP_KERNEL);
6203
6204 if (!vhost->login_buf) {
6205 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
6206 goto free_sg_pool;
6207 }
6208
6209 if (ibmvfc_alloc_disc_buf(dev, &vhost->scsi_scrqs))
6210 goto free_login_buffer;
6211
6212 vhost->trace = kzalloc_objs(struct ibmvfc_trace_entry,
6213 IBMVFC_NUM_TRACE_ENTRIES);
6214 atomic_set(&vhost->trace_index, -1);
6215
6216 if (!vhost->trace)
6217 goto free_scsi_disc_buffer;
6218
6219 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6220 sizeof(struct ibmvfc_target));
6221
6222 if (!vhost->tgt_pool) {
6223 dev_err(dev, "Couldn't allocate target memory pool\n");
6224 goto free_trace;
6225 }
6226
6227 vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf),
6228 &vhost->channel_setup_dma,
6229 GFP_KERNEL);
6230
6231 if (!vhost->channel_setup_buf) {
6232 dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6233 goto free_tgt_pool;
6234 }
6235
6236 LEAVE;
6237 return 0;
6238
6239 free_tgt_pool:
6240 mempool_destroy(vhost->tgt_pool);
6241 free_trace:
6242 kfree(vhost->trace);
6243 free_scsi_disc_buffer:
6244 ibmvfc_free_disc_buf(dev, &vhost->scsi_scrqs);
6245 free_login_buffer:
6246 dma_free_coherent(dev, sizeof(*vhost->login_buf),
6247 vhost->login_buf, vhost->login_buf_dma);
6248 free_sg_pool:
6249 dma_pool_destroy(vhost->sg_pool);
6250 unmap_async_crq:
6251 ibmvfc_free_queue(vhost, async_q);
6252 nomem:
6253 LEAVE;
6254 return -ENOMEM;
6255 }
6256
6257 /**
6258 * ibmvfc_rport_add_thread - Worker thread for rport adds
6259 * @work: work struct
6260 *
6261 **/
ibmvfc_rport_add_thread(struct work_struct * work)6262 static void ibmvfc_rport_add_thread(struct work_struct *work)
6263 {
6264 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6265 rport_add_work_q);
6266 struct ibmvfc_target *tgt;
6267 struct fc_rport *rport;
6268 unsigned long flags;
6269 int did_work;
6270
6271 ENTER;
6272 spin_lock_irqsave(vhost->host->host_lock, flags);
6273 do {
6274 did_work = 0;
6275 if (vhost->state != IBMVFC_ACTIVE)
6276 break;
6277
6278 list_for_each_entry(tgt, &vhost->targets, queue) {
6279 if (tgt->add_rport) {
6280 did_work = 1;
6281 tgt->add_rport = 0;
6282 kref_get(&tgt->kref);
6283 rport = tgt->rport;
6284 if (!rport) {
6285 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6286 ibmvfc_tgt_add_rport(tgt);
6287 } else if (get_device(&rport->dev)) {
6288 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6289 tgt_dbg(tgt, "Setting rport roles\n");
6290 fc_remote_port_rolechg(rport, tgt->ids.roles);
6291 put_device(&rport->dev);
6292 } else {
6293 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6294 }
6295
6296 kref_put(&tgt->kref, ibmvfc_release_tgt);
6297 spin_lock_irqsave(vhost->host->host_lock, flags);
6298 break;
6299 }
6300 }
6301 } while(did_work);
6302
6303 if (vhost->state == IBMVFC_ACTIVE)
6304 vhost->scan_complete = 1;
6305 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6306 LEAVE;
6307 }
6308
6309 /**
6310 * ibmvfc_probe - Adapter hot plug add entry point
6311 * @vdev: vio device struct
6312 * @id: vio device id struct
6313 *
6314 * Return value:
6315 * 0 on success / non-zero on failure
6316 **/
ibmvfc_probe(struct vio_dev * vdev,const struct vio_device_id * id)6317 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6318 {
6319 struct ibmvfc_host *vhost;
6320 struct Scsi_Host *shost;
6321 struct device *dev = &vdev->dev;
6322 int rc = -ENOMEM;
6323 unsigned int online_cpus = num_online_cpus();
6324 unsigned int max_scsi_queues = min((unsigned int)IBMVFC_MAX_SCSI_QUEUES, online_cpus);
6325
6326 ENTER;
6327 shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6328 if (!shost) {
6329 dev_err(dev, "Couldn't allocate host data\n");
6330 goto out;
6331 }
6332
6333 shost->transportt = ibmvfc_transport_template;
6334 shost->can_queue = scsi_qdepth;
6335 shost->max_lun = max_lun;
6336 shost->max_id = max_targets;
6337 shost->max_sectors = max_sectors;
6338 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6339 shost->unique_id = shost->host_no;
6340 shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6341
6342 vhost = shost_priv(shost);
6343 INIT_LIST_HEAD(&vhost->targets);
6344 INIT_LIST_HEAD(&vhost->purge);
6345 sprintf(vhost->name, IBMVFC_NAME);
6346 vhost->host = shost;
6347 vhost->dev = dev;
6348 vhost->partition_number = -1;
6349 vhost->log_level = log_level;
6350 vhost->task_set = 1;
6351
6352 vhost->mq_enabled = mq_enabled;
6353 vhost->scsi_scrqs.desired_queues = min(shost->nr_hw_queues, nr_scsi_channels);
6354 vhost->scsi_scrqs.max_queues = shost->nr_hw_queues;
6355 vhost->scsi_scrqs.protocol = IBMVFC_PROTO_SCSI;
6356 vhost->using_channels = 0;
6357 vhost->do_enquiry = 1;
6358 vhost->scan_timeout = 0;
6359
6360 strcpy(vhost->partition_name, "UNKNOWN");
6361 init_waitqueue_head(&vhost->work_wait_q);
6362 init_waitqueue_head(&vhost->init_wait_q);
6363 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6364 mutex_init(&vhost->passthru_mutex);
6365
6366 if ((rc = ibmvfc_alloc_mem(vhost)))
6367 goto free_scsi_host;
6368
6369 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6370 shost->host_no);
6371
6372 if (IS_ERR(vhost->work_thread)) {
6373 dev_err(dev, "Couldn't create kernel thread: %ld\n",
6374 PTR_ERR(vhost->work_thread));
6375 rc = PTR_ERR(vhost->work_thread);
6376 goto free_host_mem;
6377 }
6378
6379 if ((rc = ibmvfc_init_crq(vhost))) {
6380 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6381 goto kill_kthread;
6382 }
6383
6384 if ((rc = scsi_add_host(shost, dev)))
6385 goto release_crq;
6386
6387 fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6388
6389 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6390 &ibmvfc_trace_attr))) {
6391 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6392 goto remove_shost;
6393 }
6394
6395 ibmvfc_init_sub_crqs(vhost);
6396
6397 dev_set_drvdata(dev, vhost);
6398 spin_lock(&ibmvfc_driver_lock);
6399 list_add_tail(&vhost->queue, &ibmvfc_head);
6400 spin_unlock(&ibmvfc_driver_lock);
6401
6402 ibmvfc_send_crq_init(vhost);
6403 scsi_scan_host(shost);
6404 return 0;
6405
6406 remove_shost:
6407 scsi_remove_host(shost);
6408 release_crq:
6409 ibmvfc_release_crq_queue(vhost);
6410 kill_kthread:
6411 kthread_stop(vhost->work_thread);
6412 free_host_mem:
6413 ibmvfc_free_mem(vhost);
6414 free_scsi_host:
6415 scsi_host_put(shost);
6416 out:
6417 LEAVE;
6418 return rc;
6419 }
6420
6421 /**
6422 * ibmvfc_remove - Adapter hot plug remove entry point
6423 * @vdev: vio device struct
6424 *
6425 * Return value:
6426 * 0
6427 **/
ibmvfc_remove(struct vio_dev * vdev)6428 static void ibmvfc_remove(struct vio_dev *vdev)
6429 {
6430 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
6431 LIST_HEAD(purge);
6432 unsigned long flags;
6433
6434 ENTER;
6435 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6436
6437 spin_lock_irqsave(vhost->host->host_lock, flags);
6438 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
6439 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6440
6441 ibmvfc_wait_while_resetting(vhost);
6442 kthread_stop(vhost->work_thread);
6443 fc_remove_host(vhost->host);
6444 scsi_remove_host(vhost->host);
6445
6446 spin_lock_irqsave(vhost->host->host_lock, flags);
6447 ibmvfc_purge_requests(vhost, DID_ERROR);
6448 list_splice_init(&vhost->purge, &purge);
6449 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6450 ibmvfc_complete_purge(&purge);
6451 ibmvfc_release_sub_crqs(vhost);
6452 ibmvfc_release_crq_queue(vhost);
6453
6454 ibmvfc_free_mem(vhost);
6455 spin_lock(&ibmvfc_driver_lock);
6456 list_del(&vhost->queue);
6457 spin_unlock(&ibmvfc_driver_lock);
6458 scsi_host_put(vhost->host);
6459 LEAVE;
6460 }
6461
6462 /**
6463 * ibmvfc_resume - Resume from suspend
6464 * @dev: device struct
6465 *
6466 * We may have lost an interrupt across suspend/resume, so kick the
6467 * interrupt handler
6468 *
6469 */
ibmvfc_resume(struct device * dev)6470 static int ibmvfc_resume(struct device *dev)
6471 {
6472 unsigned long flags;
6473 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6474 struct vio_dev *vdev = to_vio_dev(dev);
6475
6476 spin_lock_irqsave(vhost->host->host_lock, flags);
6477 vio_disable_interrupts(vdev);
6478 tasklet_schedule(&vhost->tasklet);
6479 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6480 return 0;
6481 }
6482
6483 /**
6484 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6485 * @vdev: vio device struct
6486 *
6487 * Return value:
6488 * Number of bytes the driver will need to DMA map at the same time in
6489 * order to perform well.
6490 */
ibmvfc_get_desired_dma(struct vio_dev * vdev)6491 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6492 {
6493 unsigned long pool_dma;
6494
6495 pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu);
6496 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6497 }
6498
6499 static const struct vio_device_id ibmvfc_device_table[] = {
6500 {"fcp", "IBM,vfc-client"},
6501 { "", "" }
6502 };
6503 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6504
6505 static const struct dev_pm_ops ibmvfc_pm_ops = {
6506 .resume = ibmvfc_resume
6507 };
6508
6509 static struct vio_driver ibmvfc_driver = {
6510 .id_table = ibmvfc_device_table,
6511 .probe = ibmvfc_probe,
6512 .remove = ibmvfc_remove,
6513 .get_desired_dma = ibmvfc_get_desired_dma,
6514 .name = IBMVFC_NAME,
6515 .pm = &ibmvfc_pm_ops,
6516 };
6517
6518 static struct fc_function_template ibmvfc_transport_functions = {
6519 .show_host_fabric_name = 1,
6520 .show_host_node_name = 1,
6521 .show_host_port_name = 1,
6522 .show_host_supported_classes = 1,
6523 .show_host_port_type = 1,
6524 .show_host_port_id = 1,
6525 .show_host_maxframe_size = 1,
6526
6527 .get_host_port_state = ibmvfc_get_host_port_state,
6528 .show_host_port_state = 1,
6529
6530 .get_host_speed = ibmvfc_get_host_speed,
6531 .show_host_speed = 1,
6532
6533 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6534 .terminate_rport_io = ibmvfc_terminate_rport_io,
6535
6536 .show_rport_maxframe_size = 1,
6537 .show_rport_supported_classes = 1,
6538
6539 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6540 .show_rport_dev_loss_tmo = 1,
6541
6542 .get_starget_node_name = ibmvfc_get_starget_node_name,
6543 .show_starget_node_name = 1,
6544
6545 .get_starget_port_name = ibmvfc_get_starget_port_name,
6546 .show_starget_port_name = 1,
6547
6548 .get_starget_port_id = ibmvfc_get_starget_port_id,
6549 .show_starget_port_id = 1,
6550
6551 .max_bsg_segments = 1,
6552 .bsg_request = ibmvfc_bsg_request,
6553 .bsg_timeout = ibmvfc_bsg_timeout,
6554 };
6555
6556 /**
6557 * ibmvfc_module_init - Initialize the ibmvfc module
6558 *
6559 * Return value:
6560 * 0 on success / other on failure
6561 **/
ibmvfc_module_init(void)6562 static int __init ibmvfc_module_init(void)
6563 {
6564 int min_max_sectors = PAGE_SIZE >> 9;
6565 int rc;
6566
6567 if (!firmware_has_feature(FW_FEATURE_VIO))
6568 return -ENODEV;
6569
6570 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6571 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6572
6573 /*
6574 * Range check the max_sectors module parameter. The upper bounds is
6575 * implicity checked since the parameter is a ushort.
6576 */
6577 if (max_sectors < min_max_sectors) {
6578 printk(KERN_ERR IBMVFC_NAME ": max_sectors must be at least %d.\n",
6579 min_max_sectors);
6580 max_sectors = min_max_sectors;
6581 }
6582
6583 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6584 if (!ibmvfc_transport_template)
6585 return -ENOMEM;
6586
6587 rc = vio_register_driver(&ibmvfc_driver);
6588 if (rc)
6589 fc_release_transport(ibmvfc_transport_template);
6590 return rc;
6591 }
6592
6593 /**
6594 * ibmvfc_module_exit - Teardown the ibmvfc module
6595 *
6596 * Return value:
6597 * nothing
6598 **/
ibmvfc_module_exit(void)6599 static void __exit ibmvfc_module_exit(void)
6600 {
6601 vio_unregister_driver(&ibmvfc_driver);
6602 fc_release_transport(ibmvfc_transport_template);
6603 }
6604
6605 module_init(ibmvfc_module_init);
6606 module_exit(ibmvfc_module_exit);
6607