xref: /linux/drivers/scsi/smartpqi/smartpqi_sas_transport.c (revision 02680c23d7b3febe45ea3d4f9818c2b2dc89020a) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *    driver for Microsemi PQI-based storage controllers
4  *    Copyright (c) 2019-2020 Microchip Technology Inc. and its subsidiaries
5  *    Copyright (c) 2016-2018 Microsemi Corporation
6  *    Copyright (c) 2016 PMC-Sierra, Inc.
7  *
8  *    Questions/Comments/Bugfixes to storagedev@microchip.com
9  *
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/bsg-lib.h>
14 #include <scsi/scsi_host.h>
15 #include <scsi/scsi_cmnd.h>
16 #include <scsi/scsi_transport_sas.h>
17 #include <asm/unaligned.h>
18 #include "smartpqi.h"
19 
20 static struct pqi_sas_phy *pqi_alloc_sas_phy(struct pqi_sas_port *pqi_sas_port)
21 {
22 	struct pqi_sas_phy *pqi_sas_phy;
23 	struct sas_phy *phy;
24 
25 	pqi_sas_phy = kzalloc(sizeof(*pqi_sas_phy), GFP_KERNEL);
26 	if (!pqi_sas_phy)
27 		return NULL;
28 
29 	phy = sas_phy_alloc(pqi_sas_port->parent_node->parent_dev,
30 		pqi_sas_port->next_phy_index);
31 	if (!phy) {
32 		kfree(pqi_sas_phy);
33 		return NULL;
34 	}
35 
36 	pqi_sas_port->next_phy_index++;
37 	pqi_sas_phy->phy = phy;
38 	pqi_sas_phy->parent_port = pqi_sas_port;
39 
40 	return pqi_sas_phy;
41 }
42 
43 static void pqi_free_sas_phy(struct pqi_sas_phy *pqi_sas_phy)
44 {
45 	struct sas_phy *phy = pqi_sas_phy->phy;
46 
47 	sas_port_delete_phy(pqi_sas_phy->parent_port->port, phy);
48 	if (pqi_sas_phy->added_to_port)
49 		list_del(&pqi_sas_phy->phy_list_entry);
50 	sas_phy_delete(phy);
51 	kfree(pqi_sas_phy);
52 }
53 
54 static int pqi_sas_port_add_phy(struct pqi_sas_phy *pqi_sas_phy)
55 {
56 	int rc;
57 	struct pqi_sas_port *pqi_sas_port;
58 	struct sas_phy *phy;
59 	struct sas_identify *identify;
60 
61 	pqi_sas_port = pqi_sas_phy->parent_port;
62 	phy = pqi_sas_phy->phy;
63 
64 	identify = &phy->identify;
65 	memset(identify, 0, sizeof(*identify));
66 	identify->sas_address = pqi_sas_port->sas_address;
67 	identify->device_type = SAS_END_DEVICE;
68 	identify->initiator_port_protocols = SAS_PROTOCOL_ALL;
69 	identify->target_port_protocols = SAS_PROTOCOL_ALL;
70 	phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
71 	phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
72 	phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
73 	phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
74 	phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
75 
76 	rc = sas_phy_add(pqi_sas_phy->phy);
77 	if (rc)
78 		return rc;
79 
80 	sas_port_add_phy(pqi_sas_port->port, pqi_sas_phy->phy);
81 	list_add_tail(&pqi_sas_phy->phy_list_entry,
82 		&pqi_sas_port->phy_list_head);
83 	pqi_sas_phy->added_to_port = true;
84 
85 	return 0;
86 }
87 
88 static int pqi_sas_port_add_rphy(struct pqi_sas_port *pqi_sas_port,
89 	struct sas_rphy *rphy)
90 {
91 	struct sas_identify *identify;
92 
93 	identify = &rphy->identify;
94 	identify->sas_address = pqi_sas_port->sas_address;
95 
96 	identify->initiator_port_protocols = SAS_PROTOCOL_ALL;
97 	identify->target_port_protocols = SAS_PROTOCOL_STP;
98 
99 	if (pqi_sas_port->device) {
100 		identify->phy_identifier = pqi_sas_port->device->phy_id;
101 		switch (pqi_sas_port->device->device_type) {
102 		case SA_DEVICE_TYPE_SAS:
103 		case SA_DEVICE_TYPE_SES:
104 		case SA_DEVICE_TYPE_NVME:
105 			identify->target_port_protocols = SAS_PROTOCOL_SSP;
106 			break;
107 		case SA_DEVICE_TYPE_EXPANDER_SMP:
108 			identify->target_port_protocols = SAS_PROTOCOL_SMP;
109 			break;
110 		case SA_DEVICE_TYPE_SATA:
111 		default:
112 			break;
113 		}
114 	}
115 
116 	return sas_rphy_add(rphy);
117 }
118 
119 static struct sas_rphy *pqi_sas_rphy_alloc(struct pqi_sas_port *pqi_sas_port)
120 {
121 	if (pqi_sas_port->device && pqi_sas_port->device->is_expander_smp_device)
122 		return sas_expander_alloc(pqi_sas_port->port,
123 				SAS_FANOUT_EXPANDER_DEVICE);
124 
125 	return sas_end_device_alloc(pqi_sas_port->port);
126 }
127 
128 static struct pqi_sas_port *pqi_alloc_sas_port(
129 	struct pqi_sas_node *pqi_sas_node, u64 sas_address,
130 	struct pqi_scsi_dev *device)
131 {
132 	int rc;
133 	struct pqi_sas_port *pqi_sas_port;
134 	struct sas_port *port;
135 
136 	pqi_sas_port = kzalloc(sizeof(*pqi_sas_port), GFP_KERNEL);
137 	if (!pqi_sas_port)
138 		return NULL;
139 
140 	INIT_LIST_HEAD(&pqi_sas_port->phy_list_head);
141 	pqi_sas_port->parent_node = pqi_sas_node;
142 
143 	port = sas_port_alloc_num(pqi_sas_node->parent_dev);
144 	if (!port)
145 		goto free_pqi_port;
146 
147 	rc = sas_port_add(port);
148 	if (rc)
149 		goto free_sas_port;
150 
151 	pqi_sas_port->port = port;
152 	pqi_sas_port->sas_address = sas_address;
153 	pqi_sas_port->device = device;
154 	list_add_tail(&pqi_sas_port->port_list_entry,
155 		&pqi_sas_node->port_list_head);
156 
157 	return pqi_sas_port;
158 
159 free_sas_port:
160 	sas_port_free(port);
161 free_pqi_port:
162 	kfree(pqi_sas_port);
163 
164 	return NULL;
165 }
166 
167 static void pqi_free_sas_port(struct pqi_sas_port *pqi_sas_port)
168 {
169 	struct pqi_sas_phy *pqi_sas_phy;
170 	struct pqi_sas_phy *next;
171 
172 	list_for_each_entry_safe(pqi_sas_phy, next,
173 		&pqi_sas_port->phy_list_head, phy_list_entry)
174 			pqi_free_sas_phy(pqi_sas_phy);
175 
176 	sas_port_delete(pqi_sas_port->port);
177 	list_del(&pqi_sas_port->port_list_entry);
178 	kfree(pqi_sas_port);
179 }
180 
181 static struct pqi_sas_node *pqi_alloc_sas_node(struct device *parent_dev)
182 {
183 	struct pqi_sas_node *pqi_sas_node;
184 
185 	pqi_sas_node = kzalloc(sizeof(*pqi_sas_node), GFP_KERNEL);
186 	if (pqi_sas_node) {
187 		pqi_sas_node->parent_dev = parent_dev;
188 		INIT_LIST_HEAD(&pqi_sas_node->port_list_head);
189 	}
190 
191 	return pqi_sas_node;
192 }
193 
194 static void pqi_free_sas_node(struct pqi_sas_node *pqi_sas_node)
195 {
196 	struct pqi_sas_port *pqi_sas_port;
197 	struct pqi_sas_port *next;
198 
199 	if (!pqi_sas_node)
200 		return;
201 
202 	list_for_each_entry_safe(pqi_sas_port, next,
203 		&pqi_sas_node->port_list_head, port_list_entry)
204 			pqi_free_sas_port(pqi_sas_port);
205 
206 	kfree(pqi_sas_node);
207 }
208 
209 struct pqi_scsi_dev *pqi_find_device_by_sas_rphy(
210 	struct pqi_ctrl_info *ctrl_info, struct sas_rphy *rphy)
211 {
212 	struct pqi_scsi_dev *device;
213 
214 	list_for_each_entry(device, &ctrl_info->scsi_device_list,
215 		scsi_device_list_entry) {
216 		if (!device->sas_port)
217 			continue;
218 		if (device->sas_port->rphy == rphy)
219 			return device;
220 	}
221 
222 	return NULL;
223 }
224 
225 int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info)
226 {
227 	int rc;
228 	struct device *parent_dev;
229 	struct pqi_sas_node *pqi_sas_node;
230 	struct pqi_sas_port *pqi_sas_port;
231 	struct pqi_sas_phy *pqi_sas_phy;
232 
233 	parent_dev = &shost->shost_dev;
234 
235 	pqi_sas_node = pqi_alloc_sas_node(parent_dev);
236 	if (!pqi_sas_node)
237 		return -ENOMEM;
238 
239 	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
240 		ctrl_info->sas_address, NULL);
241 	if (!pqi_sas_port) {
242 		rc = -ENODEV;
243 		goto free_sas_node;
244 	}
245 
246 	pqi_sas_phy = pqi_alloc_sas_phy(pqi_sas_port);
247 	if (!pqi_sas_phy) {
248 		rc = -ENODEV;
249 		goto free_sas_port;
250 	}
251 
252 	rc = pqi_sas_port_add_phy(pqi_sas_phy);
253 	if (rc)
254 		goto free_sas_phy;
255 
256 	ctrl_info->sas_host = pqi_sas_node;
257 
258 	return 0;
259 
260 free_sas_phy:
261 	pqi_free_sas_phy(pqi_sas_phy);
262 free_sas_port:
263 	pqi_free_sas_port(pqi_sas_port);
264 free_sas_node:
265 	pqi_free_sas_node(pqi_sas_node);
266 
267 	return rc;
268 }
269 
270 void pqi_delete_sas_host(struct pqi_ctrl_info *ctrl_info)
271 {
272 	pqi_free_sas_node(ctrl_info->sas_host);
273 }
274 
275 int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
276 	struct pqi_scsi_dev *device)
277 {
278 	int rc;
279 	struct pqi_sas_port *pqi_sas_port;
280 	struct sas_rphy *rphy;
281 
282 	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
283 		device->sas_address, device);
284 	if (!pqi_sas_port)
285 		return -ENOMEM;
286 
287 	rphy = pqi_sas_rphy_alloc(pqi_sas_port);
288 	if (!rphy) {
289 		rc = -ENODEV;
290 		goto free_sas_port;
291 	}
292 
293 	pqi_sas_port->rphy = rphy;
294 	device->sas_port = pqi_sas_port;
295 
296 	rc = pqi_sas_port_add_rphy(pqi_sas_port, rphy);
297 	if (rc)
298 		goto free_sas_port;
299 
300 	return 0;
301 
302 free_sas_port:
303 	pqi_free_sas_port(pqi_sas_port);
304 	device->sas_port = NULL;
305 
306 	return rc;
307 }
308 
309 void pqi_remove_sas_device(struct pqi_scsi_dev *device)
310 {
311 	if (device->sas_port) {
312 		pqi_free_sas_port(device->sas_port);
313 		device->sas_port = NULL;
314 	}
315 }
316 
317 static int pqi_sas_get_linkerrors(struct sas_phy *phy)
318 {
319 	return 0;
320 }
321 
322 static int pqi_sas_get_enclosure_identifier(struct sas_rphy *rphy,
323 	u64 *identifier)
324 {
325 	int rc;
326 	unsigned long flags;
327 	struct Scsi_Host *shost;
328 	struct pqi_ctrl_info *ctrl_info;
329 	struct pqi_scsi_dev *found_device;
330 	struct pqi_scsi_dev *device;
331 
332 	if (!rphy)
333 		return -ENODEV;
334 
335 	shost = rphy_to_shost(rphy);
336 	ctrl_info = shost_to_hba(shost);
337 	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
338 	found_device = pqi_find_device_by_sas_rphy(ctrl_info, rphy);
339 
340 	if (!found_device) {
341 		rc = -ENODEV;
342 		goto out;
343 	}
344 
345 	if (found_device->devtype == TYPE_ENCLOSURE) {
346 		*identifier = get_unaligned_be64(&found_device->wwid);
347 		rc = 0;
348 		goto out;
349 	}
350 
351 	if (found_device->box_index == 0xff ||
352 		found_device->phys_box_on_bus == 0 ||
353 		found_device->bay == 0xff) {
354 		rc = -EINVAL;
355 		goto out;
356 	}
357 
358 	list_for_each_entry(device, &ctrl_info->scsi_device_list,
359 		scsi_device_list_entry) {
360 		if (device->devtype == TYPE_ENCLOSURE &&
361 			device->box_index == found_device->box_index &&
362 			device->phys_box_on_bus ==
363 				found_device->phys_box_on_bus &&
364 			memcmp(device->phys_connector,
365 				found_device->phys_connector, 2) == 0) {
366 			*identifier =
367 				get_unaligned_be64(&device->wwid);
368 			rc = 0;
369 			goto out;
370 		}
371 	}
372 
373 	if (found_device->phy_connected_dev_type != SA_DEVICE_TYPE_CONTROLLER) {
374 		rc = -EINVAL;
375 		goto out;
376 	}
377 
378 	list_for_each_entry(device, &ctrl_info->scsi_device_list,
379 		scsi_device_list_entry) {
380 		if (device->devtype == TYPE_ENCLOSURE &&
381 			CISS_GET_DRIVE_NUMBER(device->scsi3addr) ==
382 				PQI_VSEP_CISS_BTL) {
383 			*identifier = get_unaligned_be64(&device->wwid);
384 			rc = 0;
385 			goto out;
386 		}
387 	}
388 
389 	rc = -EINVAL;
390 out:
391 	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
392 
393 	return rc;
394 }
395 
396 static int pqi_sas_get_bay_identifier(struct sas_rphy *rphy)
397 {
398 	int rc;
399 	unsigned long flags;
400 	struct pqi_ctrl_info *ctrl_info;
401 	struct pqi_scsi_dev *device;
402 	struct Scsi_Host *shost;
403 
404 	if (!rphy)
405 		return -ENODEV;
406 
407 	shost = rphy_to_shost(rphy);
408 	ctrl_info = shost_to_hba(shost);
409 	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
410 	device = pqi_find_device_by_sas_rphy(ctrl_info, rphy);
411 
412 	if (!device) {
413 		rc = -ENODEV;
414 		goto out;
415 	}
416 
417 	if (device->bay == 0xff)
418 		rc = -EINVAL;
419 	else
420 		rc = device->bay;
421 
422 out:
423 	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
424 
425 	return rc;
426 }
427 
428 static int pqi_sas_phy_reset(struct sas_phy *phy, int hard_reset)
429 {
430 	return 0;
431 }
432 
433 static int pqi_sas_phy_enable(struct sas_phy *phy, int enable)
434 {
435 	return 0;
436 }
437 
438 static int pqi_sas_phy_setup(struct sas_phy *phy)
439 {
440 	return 0;
441 }
442 
443 static void pqi_sas_phy_release(struct sas_phy *phy)
444 {
445 }
446 
447 static int pqi_sas_phy_speed(struct sas_phy *phy,
448 	struct sas_phy_linkrates *rates)
449 {
450 	return -EINVAL;
451 }
452 
453 #define CSMI_IOCTL_TIMEOUT	60
454 #define SMP_CRC_FIELD_LENGTH	4
455 
456 static struct bmic_csmi_smp_passthru_buffer *
457 pqi_build_csmi_smp_passthru_buffer(struct sas_rphy *rphy,
458 	struct bsg_job *job)
459 {
460 	struct bmic_csmi_smp_passthru_buffer *smp_buf;
461 	struct bmic_csmi_ioctl_header *ioctl_header;
462 	struct bmic_csmi_smp_passthru *parameters;
463 	u32 req_size;
464 	u32 resp_size;
465 
466 	smp_buf = kzalloc(sizeof(*smp_buf), GFP_KERNEL);
467 	if (!smp_buf)
468 		return NULL;
469 
470 	req_size = job->request_payload.payload_len;
471 	resp_size = job->reply_payload.payload_len;
472 
473 	ioctl_header = &smp_buf->ioctl_header;
474 	put_unaligned_le32(sizeof(smp_buf->ioctl_header),
475 		&ioctl_header->header_length);
476 	put_unaligned_le32(CSMI_IOCTL_TIMEOUT, &ioctl_header->timeout);
477 	put_unaligned_le32(CSMI_CC_SAS_SMP_PASSTHRU,
478 		&ioctl_header->control_code);
479 	put_unaligned_le32(sizeof(smp_buf->parameters), &ioctl_header->length);
480 
481 	parameters = &smp_buf->parameters;
482 	parameters->phy_identifier = rphy->identify.phy_identifier;
483 	parameters->port_identifier = 0;
484 	parameters->connection_rate = 0;
485 	put_unaligned_be64(rphy->identify.sas_address,
486 		&parameters->destination_sas_address);
487 
488 	if (req_size > SMP_CRC_FIELD_LENGTH)
489 		req_size -= SMP_CRC_FIELD_LENGTH;
490 
491 	put_unaligned_le32(req_size, &parameters->request_length);
492 	put_unaligned_le32(resp_size, &parameters->response_length);
493 
494 	sg_copy_to_buffer(job->request_payload.sg_list,
495 		job->reply_payload.sg_cnt, &parameters->request,
496 		req_size);
497 
498 	return smp_buf;
499 }
500 
501 static unsigned int pqi_build_sas_smp_handler_reply(
502 	struct bmic_csmi_smp_passthru_buffer *smp_buf, struct bsg_job *job,
503 	struct pqi_raid_error_info *error_info)
504 {
505 	sg_copy_from_buffer(job->reply_payload.sg_list,
506 		job->reply_payload.sg_cnt, &smp_buf->parameters.response,
507 		le32_to_cpu(smp_buf->parameters.response_length));
508 
509 	job->reply_len = le16_to_cpu(error_info->sense_data_length);
510 	memcpy(job->reply, error_info->data,
511 		le16_to_cpu(error_info->sense_data_length));
512 
513 	return job->reply_payload.payload_len -
514 		get_unaligned_le32(&error_info->data_in_transferred);
515 }
516 
517 void pqi_sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
518 	struct sas_rphy *rphy)
519 {
520 	int rc;
521 	struct pqi_ctrl_info *ctrl_info;
522 	struct bmic_csmi_smp_passthru_buffer *smp_buf;
523 	struct pqi_raid_error_info error_info;
524 	unsigned int reslen = 0;
525 
526 	ctrl_info = shost_to_hba(shost);
527 
528 	if (job->reply_payload.payload_len == 0) {
529 		rc = -ENOMEM;
530 		goto out;
531 	}
532 
533 	if (!rphy) {
534 		rc = -EINVAL;
535 		goto out;
536 	}
537 
538 	if (rphy->identify.device_type != SAS_FANOUT_EXPANDER_DEVICE) {
539 		rc = -EINVAL;
540 		goto out;
541 	}
542 
543 	if (job->request_payload.sg_cnt > 1 || job->reply_payload.sg_cnt > 1) {
544 		rc = -EINVAL;
545 		goto out;
546 	}
547 
548 	smp_buf = pqi_build_csmi_smp_passthru_buffer(rphy, job);
549 	if (!smp_buf) {
550 		rc = -ENOMEM;
551 		goto out;
552 	}
553 
554 	rc = pqi_csmi_smp_passthru(ctrl_info, smp_buf, sizeof(*smp_buf),
555 		&error_info);
556 	if (rc)
557 		goto out;
558 
559 	reslen = pqi_build_sas_smp_handler_reply(smp_buf, job, &error_info);
560 
561 out:
562 	bsg_job_done(job, rc, reslen);
563 }
564 struct sas_function_template pqi_sas_transport_functions = {
565 	.get_linkerrors = pqi_sas_get_linkerrors,
566 	.get_enclosure_identifier = pqi_sas_get_enclosure_identifier,
567 	.get_bay_identifier = pqi_sas_get_bay_identifier,
568 	.phy_reset = pqi_sas_phy_reset,
569 	.phy_enable = pqi_sas_phy_enable,
570 	.phy_setup = pqi_sas_phy_setup,
571 	.phy_release = pqi_sas_phy_release,
572 	.set_phy_speed = pqi_sas_phy_speed,
573 	.smp_handler = pqi_sas_smp_handler,
574 };
575