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_STP;
69 	identify->target_port_protocols = SAS_PROTOCOL_STP;
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 	if (pqi_sas_port->device &&
97 		pqi_sas_port->device->is_expander_smp_device) {
98 		identify->initiator_port_protocols = SAS_PROTOCOL_SMP;
99 		identify->target_port_protocols = SAS_PROTOCOL_SMP;
100 	} else {
101 		identify->initiator_port_protocols = SAS_PROTOCOL_STP;
102 		identify->target_port_protocols = SAS_PROTOCOL_STP;
103 	}
104 
105 	return sas_rphy_add(rphy);
106 }
107 
108 static struct sas_rphy *pqi_sas_rphy_alloc(struct pqi_sas_port *pqi_sas_port)
109 {
110 	if (pqi_sas_port->device &&
111 		pqi_sas_port->device->is_expander_smp_device)
112 		return sas_expander_alloc(pqi_sas_port->port,
113 				SAS_FANOUT_EXPANDER_DEVICE);
114 
115 	return sas_end_device_alloc(pqi_sas_port->port);
116 }
117 
118 static struct pqi_sas_port *pqi_alloc_sas_port(
119 	struct pqi_sas_node *pqi_sas_node, u64 sas_address,
120 	struct pqi_scsi_dev *device)
121 {
122 	int rc;
123 	struct pqi_sas_port *pqi_sas_port;
124 	struct sas_port *port;
125 
126 	pqi_sas_port = kzalloc(sizeof(*pqi_sas_port), GFP_KERNEL);
127 	if (!pqi_sas_port)
128 		return NULL;
129 
130 	INIT_LIST_HEAD(&pqi_sas_port->phy_list_head);
131 	pqi_sas_port->parent_node = pqi_sas_node;
132 
133 	port = sas_port_alloc_num(pqi_sas_node->parent_dev);
134 	if (!port)
135 		goto free_pqi_port;
136 
137 	rc = sas_port_add(port);
138 	if (rc)
139 		goto free_sas_port;
140 
141 	pqi_sas_port->port = port;
142 	pqi_sas_port->sas_address = sas_address;
143 	pqi_sas_port->device = device;
144 	list_add_tail(&pqi_sas_port->port_list_entry,
145 		&pqi_sas_node->port_list_head);
146 
147 	return pqi_sas_port;
148 
149 free_sas_port:
150 	sas_port_free(port);
151 free_pqi_port:
152 	kfree(pqi_sas_port);
153 
154 	return NULL;
155 }
156 
157 static void pqi_free_sas_port(struct pqi_sas_port *pqi_sas_port)
158 {
159 	struct pqi_sas_phy *pqi_sas_phy;
160 	struct pqi_sas_phy *next;
161 
162 	list_for_each_entry_safe(pqi_sas_phy, next,
163 		&pqi_sas_port->phy_list_head, phy_list_entry)
164 		pqi_free_sas_phy(pqi_sas_phy);
165 
166 	sas_port_delete(pqi_sas_port->port);
167 	list_del(&pqi_sas_port->port_list_entry);
168 	kfree(pqi_sas_port);
169 }
170 
171 static struct pqi_sas_node *pqi_alloc_sas_node(struct device *parent_dev)
172 {
173 	struct pqi_sas_node *pqi_sas_node;
174 
175 	pqi_sas_node = kzalloc(sizeof(*pqi_sas_node), GFP_KERNEL);
176 	if (pqi_sas_node) {
177 		pqi_sas_node->parent_dev = parent_dev;
178 		INIT_LIST_HEAD(&pqi_sas_node->port_list_head);
179 	}
180 
181 	return pqi_sas_node;
182 }
183 
184 static void pqi_free_sas_node(struct pqi_sas_node *pqi_sas_node)
185 {
186 	struct pqi_sas_port *pqi_sas_port;
187 	struct pqi_sas_port *next;
188 
189 	if (!pqi_sas_node)
190 		return;
191 
192 	list_for_each_entry_safe(pqi_sas_port, next,
193 		&pqi_sas_node->port_list_head, port_list_entry)
194 		pqi_free_sas_port(pqi_sas_port);
195 
196 	kfree(pqi_sas_node);
197 }
198 
199 struct pqi_scsi_dev *pqi_find_device_by_sas_rphy(
200 	struct pqi_ctrl_info *ctrl_info, struct sas_rphy *rphy)
201 {
202 	struct pqi_scsi_dev *device;
203 
204 	list_for_each_entry(device, &ctrl_info->scsi_device_list,
205 		scsi_device_list_entry) {
206 		if (!device->sas_port)
207 			continue;
208 		if (device->sas_port->rphy == rphy)
209 			return device;
210 	}
211 
212 	return NULL;
213 }
214 
215 int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info)
216 {
217 	int rc;
218 	struct device *parent_dev;
219 	struct pqi_sas_node *pqi_sas_node;
220 	struct pqi_sas_port *pqi_sas_port;
221 	struct pqi_sas_phy *pqi_sas_phy;
222 
223 	parent_dev = &shost->shost_dev;
224 
225 	pqi_sas_node = pqi_alloc_sas_node(parent_dev);
226 	if (!pqi_sas_node)
227 		return -ENOMEM;
228 
229 	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
230 		ctrl_info->sas_address, NULL);
231 	if (!pqi_sas_port) {
232 		rc = -ENODEV;
233 		goto free_sas_node;
234 	}
235 
236 	pqi_sas_phy = pqi_alloc_sas_phy(pqi_sas_port);
237 	if (!pqi_sas_phy) {
238 		rc = -ENODEV;
239 		goto free_sas_port;
240 	}
241 
242 	rc = pqi_sas_port_add_phy(pqi_sas_phy);
243 	if (rc)
244 		goto free_sas_phy;
245 
246 	ctrl_info->sas_host = pqi_sas_node;
247 
248 	return 0;
249 
250 free_sas_phy:
251 	pqi_free_sas_phy(pqi_sas_phy);
252 free_sas_port:
253 	pqi_free_sas_port(pqi_sas_port);
254 free_sas_node:
255 	pqi_free_sas_node(pqi_sas_node);
256 
257 	return rc;
258 }
259 
260 void pqi_delete_sas_host(struct pqi_ctrl_info *ctrl_info)
261 {
262 	pqi_free_sas_node(ctrl_info->sas_host);
263 }
264 
265 int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
266 	struct pqi_scsi_dev *device)
267 {
268 	int rc;
269 	struct pqi_sas_port *pqi_sas_port;
270 	struct sas_rphy *rphy;
271 
272 	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
273 		device->sas_address, device);
274 	if (!pqi_sas_port)
275 		return -ENOMEM;
276 
277 	rphy = pqi_sas_rphy_alloc(pqi_sas_port);
278 	if (!rphy) {
279 		rc = -ENODEV;
280 		goto free_sas_port;
281 	}
282 
283 	pqi_sas_port->rphy = rphy;
284 	device->sas_port = pqi_sas_port;
285 
286 	rc = pqi_sas_port_add_rphy(pqi_sas_port, rphy);
287 	if (rc)
288 		goto free_sas_port;
289 
290 	return 0;
291 
292 free_sas_port:
293 	pqi_free_sas_port(pqi_sas_port);
294 	device->sas_port = NULL;
295 
296 	return rc;
297 }
298 
299 void pqi_remove_sas_device(struct pqi_scsi_dev *device)
300 {
301 	if (device->sas_port) {
302 		pqi_free_sas_port(device->sas_port);
303 		device->sas_port = NULL;
304 	}
305 }
306 
307 static int pqi_sas_get_linkerrors(struct sas_phy *phy)
308 {
309 	return 0;
310 }
311 
312 static int pqi_sas_get_enclosure_identifier(struct sas_rphy *rphy,
313 	u64 *identifier)
314 {
315 	int rc;
316 	unsigned long flags;
317 	struct Scsi_Host *shost;
318 	struct pqi_ctrl_info *ctrl_info;
319 	struct pqi_scsi_dev *found_device;
320 	struct pqi_scsi_dev *device;
321 
322 	if (!rphy)
323 		return -ENODEV;
324 
325 	shost = rphy_to_shost(rphy);
326 	ctrl_info = shost_to_hba(shost);
327 	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
328 	found_device = pqi_find_device_by_sas_rphy(ctrl_info, rphy);
329 
330 	if (!found_device) {
331 		rc = -ENODEV;
332 		goto out;
333 	}
334 
335 	if (found_device->devtype == TYPE_ENCLOSURE) {
336 		*identifier = get_unaligned_be64(&found_device->wwid);
337 		rc = 0;
338 		goto out;
339 	}
340 
341 	if (found_device->box_index == 0xff ||
342 		found_device->phys_box_on_bus == 0 ||
343 		found_device->bay == 0xff) {
344 		rc = -EINVAL;
345 		goto out;
346 	}
347 
348 	list_for_each_entry(device, &ctrl_info->scsi_device_list,
349 		scsi_device_list_entry) {
350 		if (device->devtype == TYPE_ENCLOSURE &&
351 			device->box_index == found_device->box_index &&
352 			device->phys_box_on_bus ==
353 				found_device->phys_box_on_bus &&
354 			memcmp(device->phys_connector,
355 				found_device->phys_connector, 2) == 0) {
356 			*identifier =
357 				get_unaligned_be64(&device->wwid);
358 			rc = 0;
359 			goto out;
360 		}
361 	}
362 
363 	if (found_device->phy_connected_dev_type != SA_DEVICE_TYPE_CONTROLLER) {
364 		rc = -EINVAL;
365 		goto out;
366 	}
367 
368 	list_for_each_entry(device, &ctrl_info->scsi_device_list,
369 		scsi_device_list_entry) {
370 		if (device->devtype == TYPE_ENCLOSURE &&
371 			CISS_GET_DRIVE_NUMBER(device->scsi3addr) ==
372 				PQI_VSEP_CISS_BTL) {
373 			*identifier = get_unaligned_be64(&device->wwid);
374 			rc = 0;
375 			goto out;
376 		}
377 	}
378 
379 	rc = -EINVAL;
380 out:
381 	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
382 
383 	return rc;
384 }
385 
386 static int pqi_sas_get_bay_identifier(struct sas_rphy *rphy)
387 {
388 	int rc;
389 	unsigned long flags;
390 	struct pqi_ctrl_info *ctrl_info;
391 	struct pqi_scsi_dev *device;
392 	struct Scsi_Host *shost;
393 
394 	if (!rphy)
395 		return -ENODEV;
396 
397 	shost = rphy_to_shost(rphy);
398 	ctrl_info = shost_to_hba(shost);
399 	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
400 	device = pqi_find_device_by_sas_rphy(ctrl_info, rphy);
401 
402 	if (!device) {
403 		rc = -ENODEV;
404 		goto out;
405 	}
406 
407 	if (device->bay == 0xff)
408 		rc = -EINVAL;
409 	else
410 		rc = device->bay;
411 
412 out:
413 	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
414 
415 	return rc;
416 }
417 
418 static int pqi_sas_phy_reset(struct sas_phy *phy, int hard_reset)
419 {
420 	return 0;
421 }
422 
423 static int pqi_sas_phy_enable(struct sas_phy *phy, int enable)
424 {
425 	return 0;
426 }
427 
428 static int pqi_sas_phy_setup(struct sas_phy *phy)
429 {
430 	return 0;
431 }
432 
433 static void pqi_sas_phy_release(struct sas_phy *phy)
434 {
435 }
436 
437 static int pqi_sas_phy_speed(struct sas_phy *phy,
438 	struct sas_phy_linkrates *rates)
439 {
440 	return -EINVAL;
441 }
442 
443 #define CSMI_IOCTL_TIMEOUT	60
444 #define SMP_CRC_FIELD_LENGTH	4
445 
446 static struct bmic_csmi_smp_passthru_buffer *
447 pqi_build_csmi_smp_passthru_buffer(struct sas_rphy *rphy,
448 	struct bsg_job *job)
449 {
450 	struct bmic_csmi_smp_passthru_buffer *smp_buf;
451 	struct bmic_csmi_ioctl_header *ioctl_header;
452 	struct bmic_csmi_smp_passthru *parameters;
453 	u32 req_size;
454 	u32 resp_size;
455 
456 	smp_buf = kzalloc(sizeof(*smp_buf), GFP_KERNEL);
457 	if (!smp_buf)
458 		return NULL;
459 
460 	req_size = job->request_payload.payload_len;
461 	resp_size = job->reply_payload.payload_len;
462 
463 	ioctl_header = &smp_buf->ioctl_header;
464 	put_unaligned_le32(sizeof(smp_buf->ioctl_header),
465 		&ioctl_header->header_length);
466 	put_unaligned_le32(CSMI_IOCTL_TIMEOUT, &ioctl_header->timeout);
467 	put_unaligned_le32(CSMI_CC_SAS_SMP_PASSTHRU,
468 		&ioctl_header->control_code);
469 	put_unaligned_le32(sizeof(smp_buf->parameters), &ioctl_header->length);
470 
471 	parameters = &smp_buf->parameters;
472 	parameters->phy_identifier = rphy->identify.phy_identifier;
473 	parameters->port_identifier = 0;
474 	parameters->connection_rate = 0;
475 	put_unaligned_be64(rphy->identify.sas_address,
476 		&parameters->destination_sas_address);
477 
478 	if (req_size > SMP_CRC_FIELD_LENGTH)
479 		req_size -= SMP_CRC_FIELD_LENGTH;
480 
481 	put_unaligned_le32(req_size, &parameters->request_length);
482 	put_unaligned_le32(resp_size, &parameters->response_length);
483 
484 	sg_copy_to_buffer(job->request_payload.sg_list,
485 		job->reply_payload.sg_cnt, &parameters->request,
486 		req_size);
487 
488 	return smp_buf;
489 }
490 
491 static unsigned int pqi_build_sas_smp_handler_reply(
492 	struct bmic_csmi_smp_passthru_buffer *smp_buf, struct bsg_job *job,
493 	struct pqi_raid_error_info *error_info)
494 {
495 	sg_copy_from_buffer(job->reply_payload.sg_list,
496 		job->reply_payload.sg_cnt, &smp_buf->parameters.response,
497 		le32_to_cpu(smp_buf->parameters.response_length));
498 
499 	job->reply_len = le16_to_cpu(error_info->sense_data_length);
500 	memcpy(job->reply, error_info->data,
501 			le16_to_cpu(error_info->sense_data_length));
502 
503 	return job->reply_payload.payload_len -
504 		get_unaligned_le32(&error_info->data_in_transferred);
505 }
506 
507 void pqi_sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
508 	struct sas_rphy *rphy)
509 {
510 	int rc;
511 	struct pqi_ctrl_info *ctrl_info;
512 	struct bmic_csmi_smp_passthru_buffer *smp_buf;
513 	struct pqi_raid_error_info error_info;
514 	unsigned int reslen = 0;
515 
516 	ctrl_info = shost_to_hba(shost);
517 
518 	if (job->reply_payload.payload_len == 0) {
519 		rc = -ENOMEM;
520 		goto out;
521 	}
522 
523 	if (!rphy) {
524 		rc = -EINVAL;
525 		goto out;
526 	}
527 
528 	if (rphy->identify.device_type != SAS_FANOUT_EXPANDER_DEVICE) {
529 		rc = -EINVAL;
530 		goto out;
531 	}
532 
533 	if (job->request_payload.sg_cnt > 1 || job->reply_payload.sg_cnt > 1) {
534 		rc = -EINVAL;
535 		goto out;
536 	}
537 
538 	smp_buf = pqi_build_csmi_smp_passthru_buffer(rphy, job);
539 	if (!smp_buf) {
540 		rc = -ENOMEM;
541 		goto out;
542 	}
543 
544 	rc = pqi_csmi_smp_passthru(ctrl_info, smp_buf, sizeof(*smp_buf),
545 		&error_info);
546 	if (rc)
547 		goto out;
548 
549 	reslen = pqi_build_sas_smp_handler_reply(smp_buf, job, &error_info);
550 out:
551 	bsg_job_done(job, rc, reslen);
552 	pqi_ctrl_unbusy(ctrl_info);
553 }
554 struct sas_function_template pqi_sas_transport_functions = {
555 	.get_linkerrors = pqi_sas_get_linkerrors,
556 	.get_enclosure_identifier = pqi_sas_get_enclosure_identifier,
557 	.get_bay_identifier = pqi_sas_get_bay_identifier,
558 	.phy_reset = pqi_sas_phy_reset,
559 	.phy_enable = pqi_sas_phy_enable,
560 	.phy_setup = pqi_sas_phy_setup,
561 	.phy_release = pqi_sas_phy_release,
562 	.set_phy_speed = pqi_sas_phy_speed,
563 	.smp_handler = pqi_sas_smp_handler,
564 };
565