xref: /freebsd/sys/dev/ufshci/ufshci_req_queue.c (revision 3a99f31fdb6c66434f77d83ca5166aae4ad2d22c)
1 /*-
2  * Copyright (c) 2025, Samsung Electronics Co., Ltd.
3  * Written by Jaeyoon Choi
4  *
5  * SPDX-License-Identifier: BSD-2-Clause
6  */
7 
8 #include <sys/param.h>
9 #include <sys/bus.h>
10 #include <sys/conf.h>
11 #include <sys/domainset.h>
12 #include <sys/module.h>
13 
14 #include <cam/scsi/scsi_all.h>
15 
16 #include "sys/kassert.h"
17 #include "ufshci_private.h"
18 
19 static void ufshci_req_queue_submit_tracker(struct ufshci_req_queue *req_queue,
20     struct ufshci_tracker *tr, enum ufshci_data_direction data_direction);
21 
22 static const struct ufshci_qops sdb_utmr_qops = {
23 	.construct = ufshci_req_sdb_construct,
24 	.destroy = ufshci_req_sdb_destroy,
25 	.get_hw_queue = ufshci_req_sdb_get_hw_queue,
26 	.enable = ufshci_req_sdb_enable,
27 	.disable = ufshci_req_sdb_disable,
28 	.reserve_slot = ufshci_req_sdb_reserve_slot,
29 	.reserve_admin_slot = ufshci_req_sdb_reserve_slot,
30 	.ring_doorbell = ufshci_req_sdb_utmr_ring_doorbell,
31 	.is_doorbell_cleared = ufshci_req_sdb_utmr_is_doorbell_cleared,
32 	.clear_cpl_ntf = ufshci_req_sdb_utmr_clear_cpl_ntf,
33 	.process_cpl = ufshci_req_sdb_process_cpl,
34 	.get_inflight_io = ufshci_req_sdb_get_inflight_io,
35 };
36 
37 static const struct ufshci_qops sdb_utr_qops = {
38 	.construct = ufshci_req_sdb_construct,
39 	.destroy = ufshci_req_sdb_destroy,
40 	.get_hw_queue = ufshci_req_sdb_get_hw_queue,
41 	.enable = ufshci_req_sdb_enable,
42 	.disable = ufshci_req_sdb_disable,
43 	.reserve_slot = ufshci_req_sdb_reserve_slot,
44 	.reserve_admin_slot = ufshci_req_sdb_reserve_slot,
45 	.ring_doorbell = ufshci_req_sdb_utr_ring_doorbell,
46 	.is_doorbell_cleared = ufshci_req_sdb_utr_is_doorbell_cleared,
47 	.clear_cpl_ntf = ufshci_req_sdb_utr_clear_cpl_ntf,
48 	.process_cpl = ufshci_req_sdb_process_cpl,
49 	.get_inflight_io = ufshci_req_sdb_get_inflight_io,
50 };
51 
52 int
ufshci_utmr_req_queue_construct(struct ufshci_controller * ctrlr)53 ufshci_utmr_req_queue_construct(struct ufshci_controller *ctrlr)
54 {
55 	struct ufshci_req_queue *req_queue;
56 	int error;
57 
58 	/*
59 	 * UTP Task Management Request only supports Legacy Single Doorbell
60 	 * Queue.
61 	 */
62 	req_queue = &ctrlr->task_mgmt_req_queue;
63 	req_queue->queue_mode = UFSHCI_Q_MODE_SDB;
64 	req_queue->qops = sdb_utmr_qops;
65 
66 	error = req_queue->qops.construct(ctrlr, req_queue, UFSHCI_UTRM_ENTRIES,
67 	    /*is_task_mgmt*/ true);
68 
69 	return (error);
70 }
71 
72 void
ufshci_utmr_req_queue_destroy(struct ufshci_controller * ctrlr)73 ufshci_utmr_req_queue_destroy(struct ufshci_controller *ctrlr)
74 {
75 	ctrlr->task_mgmt_req_queue.qops.destroy(ctrlr,
76 	    &ctrlr->task_mgmt_req_queue);
77 }
78 
79 void
ufshci_utmr_req_queue_disable(struct ufshci_controller * ctrlr)80 ufshci_utmr_req_queue_disable(struct ufshci_controller *ctrlr)
81 {
82 	ctrlr->task_mgmt_req_queue.qops.disable(ctrlr,
83 	    &ctrlr->task_mgmt_req_queue);
84 }
85 
86 int
ufshci_utmr_req_queue_enable(struct ufshci_controller * ctrlr)87 ufshci_utmr_req_queue_enable(struct ufshci_controller *ctrlr)
88 {
89 	return (ctrlr->task_mgmt_req_queue.qops.enable(ctrlr,
90 	    &ctrlr->task_mgmt_req_queue));
91 }
92 
93 int
ufshci_utr_req_queue_construct(struct ufshci_controller * ctrlr)94 ufshci_utr_req_queue_construct(struct ufshci_controller *ctrlr)
95 {
96 	struct ufshci_req_queue *req_queue;
97 	int error;
98 
99 	/*
100 	 * Currently, it does not support MCQ mode, so it should be set to SDB
101 	 * mode by default.
102 	 * TODO: Determine queue mode by checking Capability Registers
103 	 */
104 	req_queue = &ctrlr->transfer_req_queue;
105 	req_queue->queue_mode = UFSHCI_Q_MODE_SDB;
106 	req_queue->qops = sdb_utr_qops;
107 
108 	error = req_queue->qops.construct(ctrlr, req_queue, UFSHCI_UTR_ENTRIES,
109 	    /*is_task_mgmt*/ false);
110 
111 	return (error);
112 }
113 
114 void
ufshci_utr_req_queue_destroy(struct ufshci_controller * ctrlr)115 ufshci_utr_req_queue_destroy(struct ufshci_controller *ctrlr)
116 {
117 	ctrlr->transfer_req_queue.qops.destroy(ctrlr,
118 	    &ctrlr->transfer_req_queue);
119 }
120 
121 void
ufshci_utr_req_queue_disable(struct ufshci_controller * ctrlr)122 ufshci_utr_req_queue_disable(struct ufshci_controller *ctrlr)
123 {
124 	ctrlr->transfer_req_queue.qops.disable(ctrlr,
125 	    &ctrlr->transfer_req_queue);
126 }
127 
128 int
ufshci_utr_req_queue_enable(struct ufshci_controller * ctrlr)129 ufshci_utr_req_queue_enable(struct ufshci_controller *ctrlr)
130 {
131 	return (ctrlr->transfer_req_queue.qops.enable(ctrlr,
132 	    &ctrlr->transfer_req_queue));
133 }
134 
135 static bool
ufshci_req_queue_response_is_error(struct ufshci_req_queue * req_queue,uint8_t ocs,union ufshci_reponse_upiu * response)136 ufshci_req_queue_response_is_error(struct ufshci_req_queue *req_queue,
137     uint8_t ocs, union ufshci_reponse_upiu *response)
138 {
139 	bool is_error = false;
140 
141 	/* Check request descriptor */
142 	if (ocs != UFSHCI_DESC_SUCCESS) {
143 		ufshci_printf(req_queue->ctrlr, "Invalid OCS = 0x%x\n", ocs);
144 		is_error = true;
145 	}
146 
147 	/* Check response UPIU header */
148 	if (response->header.response != UFSHCI_RESPONSE_CODE_TARGET_SUCCESS) {
149 		ufshci_printf(req_queue->ctrlr,
150 		    "Function(0x%x) Invalid response code = 0x%x\n",
151 		    response->header.ext_iid_or_function,
152 		    response->header.response);
153 		is_error = true;
154 	}
155 
156 	return (is_error);
157 }
158 
159 static void
ufshci_req_queue_manual_complete_tracker(struct ufshci_tracker * tr,uint8_t ocs,uint8_t rc)160 ufshci_req_queue_manual_complete_tracker(struct ufshci_tracker *tr, uint8_t ocs,
161     uint8_t rc)
162 {
163 	struct ufshci_utp_xfer_req_desc *desc;
164 	struct ufshci_upiu_header *resp_header;
165 
166 	mtx_assert(&tr->hwq->qlock, MA_NOTOWNED);
167 
168 	resp_header = (struct ufshci_upiu_header *)tr->ucd->response_upiu;
169 	resp_header->response = rc;
170 
171 	desc = &tr->hwq->utrd[tr->slot_num];
172 	desc->overall_command_status = ocs;
173 
174 	ufshci_req_queue_complete_tracker(tr);
175 }
176 
177 static void
ufshci_req_queue_manual_complete_request(struct ufshci_req_queue * req_queue,struct ufshci_request * req,uint8_t ocs,uint8_t rc)178 ufshci_req_queue_manual_complete_request(struct ufshci_req_queue *req_queue,
179     struct ufshci_request *req, uint8_t ocs, uint8_t rc)
180 {
181 	struct ufshci_completion cpl;
182 	bool error;
183 
184 	memset(&cpl, 0, sizeof(cpl));
185 	cpl.response_upiu.header.response = rc;
186 	error = ufshci_req_queue_response_is_error(req_queue, ocs,
187 	    &cpl.response_upiu);
188 
189 	if (error) {
190 		ufshci_printf(req_queue->ctrlr,
191 		    "Manual complete request error:0x%x", error);
192 	}
193 
194 	if (req->cb_fn)
195 		req->cb_fn(req->cb_arg, &cpl, error);
196 
197 	ufshci_free_request(req);
198 }
199 
200 void
ufshci_req_queue_fail(struct ufshci_controller * ctrlr,struct ufshci_hw_queue * hwq)201 ufshci_req_queue_fail(struct ufshci_controller *ctrlr,
202     struct ufshci_hw_queue *hwq)
203 {
204 	struct ufshci_req_queue *req_queue;
205 	struct ufshci_tracker *tr;
206 	struct ufshci_request *req;
207 	int i;
208 
209 	if (!mtx_initialized(&hwq->qlock))
210 		return;
211 
212 	mtx_lock(&hwq->qlock);
213 
214 	req_queue = &ctrlr->transfer_req_queue;
215 
216 	for (i = 0; i < req_queue->num_entries; i++) {
217 		tr = hwq->act_tr[i];
218 		req = tr->req;
219 
220 		if (tr->slot_state == UFSHCI_SLOT_STATE_RESERVED) {
221 			mtx_unlock(&hwq->qlock);
222 			ufshci_req_queue_manual_complete_request(req_queue, req,
223 			    UFSHCI_DESC_ABORTED,
224 			    UFSHCI_RESPONSE_CODE_GENERAL_FAILURE);
225 			mtx_lock(&hwq->qlock);
226 		} else if (tr->slot_state == UFSHCI_SLOT_STATE_SCHEDULED) {
227 			/*
228 			 * Do not remove the tracker. The abort_tracker path
229 			 * will do that for us.
230 			 */
231 			mtx_unlock(&hwq->qlock);
232 			ufshci_req_queue_manual_complete_tracker(tr,
233 			    UFSHCI_DESC_ABORTED,
234 			    UFSHCI_RESPONSE_CODE_GENERAL_FAILURE);
235 			mtx_lock(&hwq->qlock);
236 		}
237 	}
238 
239 	mtx_unlock(&hwq->qlock);
240 }
241 
242 void
ufshci_req_queue_complete_tracker(struct ufshci_tracker * tr)243 ufshci_req_queue_complete_tracker(struct ufshci_tracker *tr)
244 {
245 	struct ufshci_req_queue *req_queue = tr->req_queue;
246 	struct ufshci_hw_queue *hwq = tr->hwq;
247 	struct ufshci_request *req = tr->req;
248 	struct ufshci_completion cpl;
249 	uint8_t ocs;
250 	bool retry, error, retriable;
251 
252 	mtx_assert(&hwq->qlock, MA_NOTOWNED);
253 
254 	/* Copy the response from the Request Descriptor or UTP Command
255 	 * Descriptor. */
256 	cpl.size = tr->response_size;
257 	if (req_queue->is_task_mgmt) {
258 		memcpy(&cpl.response_upiu,
259 		    (void *)hwq->utmrd[tr->slot_num].response_upiu, cpl.size);
260 
261 		ocs = hwq->utmrd[tr->slot_num].overall_command_status;
262 	} else {
263 		bus_dmamap_sync(req_queue->dma_tag_ucd, req_queue->ucdmem_map,
264 		    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
265 
266 		memcpy(&cpl.response_upiu, (void *)tr->ucd->response_upiu,
267 		    cpl.size);
268 
269 		ocs = hwq->utrd[tr->slot_num].overall_command_status;
270 	}
271 
272 	error = ufshci_req_queue_response_is_error(req_queue, ocs,
273 	    &cpl.response_upiu);
274 
275 	/* TODO: Implement retry */
276 	// retriable = ufshci_completion_is_retry(cpl);
277 	retriable = false;
278 	retry = error && retriable &&
279 	    req->retries < req_queue->ctrlr->retry_count;
280 	if (retry)
281 		hwq->num_retries++;
282 	if (error && req->retries >= req_queue->ctrlr->retry_count && retriable)
283 		hwq->num_failures++;
284 
285 	KASSERT(tr->req, ("there is no request assigned to the tracker\n"));
286 	KASSERT(cpl.response_upiu.header.task_tag ==
287 		req->request_upiu.header.task_tag,
288 	    ("response task_tag does not match request task_tag\n"));
289 
290 	if (!retry) {
291 		if (req->payload_valid) {
292 			bus_dmamap_sync(req_queue->dma_tag_payload,
293 			    tr->payload_dma_map,
294 			    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
295 		}
296 		/* Copy response from the command descriptor */
297 		if (req->cb_fn)
298 			req->cb_fn(req->cb_arg, &cpl, error);
299 	}
300 
301 	mtx_lock(&hwq->qlock);
302 
303 	/* Clear the UTRL Completion Notification register */
304 	req_queue->qops.clear_cpl_ntf(req_queue->ctrlr, tr);
305 
306 	if (retry) {
307 		req->retries++;
308 		ufshci_req_queue_submit_tracker(req_queue, tr,
309 		    req->data_direction);
310 	} else {
311 		if (req->payload_valid) {
312 			bus_dmamap_unload(req_queue->dma_tag_payload,
313 			    tr->payload_dma_map);
314 		}
315 
316 		/* Clear tracker */
317 		ufshci_free_request(req);
318 		tr->req = NULL;
319 		tr->slot_state = UFSHCI_SLOT_STATE_FREE;
320 
321 		TAILQ_REMOVE(&hwq->outstanding_tr, tr, tailq);
322 		TAILQ_INSERT_HEAD(&hwq->free_tr, tr, tailq);
323 	}
324 
325 	mtx_unlock(&tr->hwq->qlock);
326 }
327 
328 bool
ufshci_req_queue_process_completions(struct ufshci_req_queue * req_queue)329 ufshci_req_queue_process_completions(struct ufshci_req_queue *req_queue)
330 {
331 	struct ufshci_hw_queue *hwq;
332 	bool done;
333 
334 	hwq = req_queue->qops.get_hw_queue(req_queue);
335 
336 	mtx_lock(&hwq->recovery_lock);
337 	done = req_queue->qops.process_cpl(req_queue);
338 	mtx_unlock(&hwq->recovery_lock);
339 
340 	return (done);
341 }
342 
343 static void
ufshci_payload_map(void * arg,bus_dma_segment_t * seg,int nseg,int error)344 ufshci_payload_map(void *arg, bus_dma_segment_t *seg, int nseg, int error)
345 {
346 	struct ufshci_tracker *tr = arg;
347 	struct ufshci_prdt_entry *prdt_entry;
348 	int i;
349 
350 	/*
351 	 * If the mapping operation failed, return immediately. The caller
352 	 * is responsible for detecting the error status and failing the
353 	 * tracker manually.
354 	 */
355 	if (error != 0) {
356 		ufshci_printf(tr->req_queue->ctrlr,
357 		    "Failed to map payload %d\n", error);
358 		return;
359 	}
360 
361 	prdt_entry = (struct ufshci_prdt_entry *)tr->ucd->prd_table;
362 
363 	tr->prdt_entry_cnt = nseg;
364 
365 	for (i = 0; i < nseg; i++) {
366 		prdt_entry->data_base_address = htole64(seg[i].ds_addr) &
367 		    0xffffffff;
368 		prdt_entry->data_base_address_upper = htole64(seg[i].ds_addr) >>
369 		    32;
370 		prdt_entry->data_byte_count = htole32(seg[i].ds_len - 1);
371 
372 		++prdt_entry;
373 	}
374 
375 	bus_dmamap_sync(tr->req_queue->dma_tag_payload, tr->payload_dma_map,
376 	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
377 }
378 
379 static void
ufshci_req_queue_prepare_prdt(struct ufshci_tracker * tr)380 ufshci_req_queue_prepare_prdt(struct ufshci_tracker *tr)
381 {
382 	struct ufshci_request *req = tr->req;
383 	struct ufshci_utp_cmd_desc *cmd_desc = tr->ucd;
384 	int error;
385 
386 	tr->prdt_off = UFSHCI_UTP_XFER_REQ_SIZE + UFSHCI_UTP_XFER_RESP_SIZE;
387 
388 	memset(cmd_desc->prd_table, 0, sizeof(cmd_desc->prd_table));
389 
390 	/* Filling PRDT enrties with payload */
391 	error = bus_dmamap_load_mem(tr->req_queue->dma_tag_payload,
392 	    tr->payload_dma_map, &req->payload, ufshci_payload_map, tr,
393 	    BUS_DMA_NOWAIT);
394 	if (error != 0) {
395 		/*
396 		 * The dmamap operation failed, so we manually fail the
397 		 *  tracker here with UFSHCI_DESC_INVALID_PRDT_ATTRIBUTES.
398 		 *
399 		 * ufshci_req_queue_manual_complete_tracker must not be called
400 		 *  with the req_queue lock held.
401 		 */
402 		ufshci_printf(tr->req_queue->ctrlr,
403 		    "bus_dmamap_load_mem returned with error:0x%x!\n", error);
404 
405 		mtx_unlock(&tr->hwq->qlock);
406 		ufshci_req_queue_manual_complete_tracker(tr,
407 		    UFSHCI_DESC_INVALID_PRDT_ATTRIBUTES,
408 		    UFSHCI_RESPONSE_CODE_GENERAL_FAILURE);
409 		mtx_lock(&tr->hwq->qlock);
410 	}
411 }
412 
413 static void
ufshci_req_queue_fill_utmr_descriptor(struct ufshci_utp_task_mgmt_req_desc * desc,struct ufshci_request * req)414 ufshci_req_queue_fill_utmr_descriptor(
415     struct ufshci_utp_task_mgmt_req_desc *desc, struct ufshci_request *req)
416 {
417 	memset(desc, 0, sizeof(struct ufshci_utp_task_mgmt_req_desc));
418 	desc->interrupt = true;
419 	/* Set the initial value to Invalid. */
420 	desc->overall_command_status = UFSHCI_UTMR_OCS_INVALID;
421 
422 	memcpy(desc->request_upiu, &req->request_upiu, req->request_size);
423 }
424 
425 static void
ufshci_req_queue_fill_utr_descriptor(struct ufshci_utp_xfer_req_desc * desc,uint8_t data_direction,const uint64_t paddr,const uint16_t response_off,const uint16_t response_len,const uint16_t prdt_off,const uint16_t prdt_entry_cnt)426 ufshci_req_queue_fill_utr_descriptor(struct ufshci_utp_xfer_req_desc *desc,
427     uint8_t data_direction, const uint64_t paddr, const uint16_t response_off,
428     const uint16_t response_len, const uint16_t prdt_off,
429     const uint16_t prdt_entry_cnt)
430 {
431 	uint8_t command_type;
432 	/* Value to convert bytes to dwords */
433 	const uint16_t dword_size = 4;
434 
435 	/*
436 	 * Set command type to UFS storage.
437 	 * The UFS 4.1 spec only defines 'UFS Storage' as a command type.
438 	 */
439 	command_type = UFSHCI_COMMAND_TYPE_UFS_STORAGE;
440 
441 	memset(desc, 0, sizeof(struct ufshci_utp_xfer_req_desc));
442 	desc->command_type = command_type;
443 	desc->data_direction = data_direction;
444 	desc->interrupt = true;
445 	/* Set the initial value to Invalid. */
446 	desc->overall_command_status = UFSHCI_UTR_OCS_INVALID;
447 	desc->utp_command_descriptor_base_address = (uint32_t)(paddr &
448 	    0xffffffff);
449 	desc->utp_command_descriptor_base_address_upper = (uint32_t)(paddr >>
450 	    32);
451 
452 	desc->response_upiu_offset = response_off / dword_size;
453 	desc->response_upiu_length = response_len / dword_size;
454 	desc->prdt_offset = prdt_off / dword_size;
455 	desc->prdt_length = prdt_entry_cnt;
456 }
457 
458 static void
ufshci_req_queue_timeout_recovery(struct ufshci_controller * ctrlr,struct ufshci_hw_queue * hwq)459 ufshci_req_queue_timeout_recovery(struct ufshci_controller *ctrlr,
460     struct ufshci_hw_queue *hwq)
461 {
462 	/* TODO: Step 2. Logical unit reset */
463 	/* TODO: Step 3. Target device reset */
464 	/* TODO: Step 4. Bus reset */
465 
466 	/*
467 	 * Step 5. All previous commands were timeout.
468 	 * Recovery failed, reset the host controller.
469 	 */
470 	ufshci_printf(ctrlr,
471 	    "Recovery step 5: Resetting controller due to a timeout.\n");
472 	hwq->recovery_state = RECOVERY_WAITING;
473 
474 	ufshci_ctrlr_reset(ctrlr);
475 }
476 
477 static void
ufshci_abort_complete(void * arg,const struct ufshci_completion * status,bool error)478 ufshci_abort_complete(void *arg, const struct ufshci_completion *status,
479     bool error)
480 {
481 	struct ufshci_tracker *tr = arg;
482 
483 	/*
484 	 * We still need to check the active tracker array, to cover race where
485 	 * I/O timed out at same time controller was completing the I/O. An
486 	 * abort request always is on the Task Management Request queue, but
487 	 * affects either an Task Management Request or an I/O (UTRL) queue, so
488 	 * take the appropriate queue lock for the original command's queue,
489 	 * since we'll need it to avoid races with the completion code and to
490 	 * complete the command manually.
491 	 */
492 	mtx_lock(&tr->hwq->qlock);
493 	if (tr->slot_state != UFSHCI_SLOT_STATE_FREE) {
494 		mtx_unlock(&tr->hwq->qlock);
495 		/*
496 		 * An I/O has timed out, and the controller was unable to abort
497 		 * it for some reason.  And we've not processed a completion for
498 		 * it yet. Construct a fake completion status, and then complete
499 		 * the I/O's tracker manually.
500 		 */
501 		ufshci_printf(tr->hwq->ctrlr,
502 		    "abort task request failed, aborting task manually\n");
503 		ufshci_req_queue_manual_complete_tracker(tr,
504 		    UFSHCI_DESC_ABORTED, UFSHCI_RESPONSE_CODE_GENERAL_FAILURE);
505 
506 		if ((status->response_upiu.task_mgmt_response_upiu
507 			    .output_param1 ==
508 			UFSHCI_TASK_MGMT_SERVICE_RESPONSE_FUNCTION_COMPLETE) ||
509 		    (status->response_upiu.task_mgmt_response_upiu
510 			    .output_param1 ==
511 			UFSHCI_TASK_MGMT_SERVICE_RESPONSE_FUNCTION_SUCCEEDED)) {
512 			ufshci_printf(tr->hwq->ctrlr,
513 			    "Warning: the abort task request completed \
514 			    successfully, but the original task is still incomplete.");
515 			return;
516 		}
517 
518 		/* Abort Task failed. Perform recovery steps 2-5 */
519 		ufshci_req_queue_timeout_recovery(tr->hwq->ctrlr, tr->hwq);
520 	} else {
521 		mtx_unlock(&tr->hwq->qlock);
522 	}
523 }
524 
525 static void
ufshci_req_queue_timeout(void * arg)526 ufshci_req_queue_timeout(void *arg)
527 {
528 	struct ufshci_hw_queue *hwq = arg;
529 	struct ufshci_controller *ctrlr = hwq->ctrlr;
530 	struct ufshci_tracker *tr;
531 	sbintime_t now;
532 	bool idle = true;
533 	bool fast;
534 
535 	mtx_assert(&hwq->recovery_lock, MA_OWNED);
536 
537 	/*
538 	 * If the controller is failed, then stop polling. This ensures that any
539 	 * failure processing that races with the hwq timeout will fail safely.
540 	 */
541 	if (ctrlr->is_failed) {
542 		ufshci_printf(ctrlr,
543 		    "Failed controller, stopping watchdog timeout.\n");
544 		hwq->timer_armed = false;
545 		return;
546 	}
547 
548 	/*
549 	 * Shutdown condition: We set hwq->timer_armed to false in
550 	 * ufshci_req_sdb_destroy before calling callout_drain. When we call
551 	 * that, this routine might get called one last time. Exit w/o setting a
552 	 * timeout. None of the watchdog stuff needs to be done since we're
553 	 * destroying the hwq.
554 	 */
555 	if (!hwq->timer_armed) {
556 		ufshci_printf(ctrlr,
557 		    "Timeout fired during ufshci_utr_req_queue_destroy\n");
558 		return;
559 	}
560 
561 	switch (hwq->recovery_state) {
562 	case RECOVERY_NONE:
563 		/*
564 		 * See if there's any recovery needed. First, do a fast check to
565 		 * see if anything could have timed out. If not, then skip
566 		 * everything else.
567 		 */
568 		fast = false;
569 		mtx_lock(&hwq->qlock);
570 		now = getsbinuptime();
571 		TAILQ_FOREACH(tr, &hwq->outstanding_tr, tailq) {
572 			/*
573 			 * If the first real transaction is not in timeout, then
574 			 * we're done. Otherwise, we try recovery.
575 			 */
576 			idle = false;
577 			if (now <= tr->deadline)
578 				fast = true;
579 			break;
580 		}
581 		mtx_unlock(&hwq->qlock);
582 		if (idle || fast)
583 			break;
584 
585 		/*
586 		 * There's a stale transaction at the start of the queue whose
587 		 * deadline has passed. Poll the competions as a last-ditch
588 		 * effort in case an interrupt has been missed.
589 		 */
590 		hwq->req_queue->qops.process_cpl(hwq->req_queue);
591 
592 		/*
593 		 * Now that we've run the ISR, re-rheck to see if there's any
594 		 * timed out commands and abort them or reset the card if so.
595 		 */
596 		mtx_lock(&hwq->qlock);
597 		idle = true;
598 		TAILQ_FOREACH(tr, &hwq->outstanding_tr, tailq) {
599 			/*
600 			 * If we know this tracker hasn't timed out, we also
601 			 * know all subsequent ones haven't timed out. The tr
602 			 * queue is in submission order and all normal commands
603 			 * in a queue have the same timeout (or the timeout was
604 			 * changed by the user, but we eventually timeout then).
605 			 */
606 			idle = false;
607 			if (now <= tr->deadline)
608 				break;
609 
610 			/*
611 			 * Timeout recovery is performed in five steps. If
612 			 * recovery fails at any step, the process continues to
613 			 * the next one:
614 			 * next steps:
615 			 * Step 1. Abort task
616 			 * Step 2. Logical unit reset 	(TODO)
617 			 * Step 3. Target device reset 	(TODO)
618 			 * Step 4. Bus reset 		(TODO)
619 			 * Step 5. Host controller reset
620 			 *
621 			 * If the timeout occurred in the Task Management
622 			 * Request queue, ignore Step 1.
623 			 */
624 			if (ctrlr->enable_aborts &&
625 			    !hwq->req_queue->is_task_mgmt &&
626 			    tr->req->cb_fn != ufshci_abort_complete) {
627 				/*
628 				 * Step 1. Timeout expired, abort the task.
629 				 *
630 				 * This isn't an abort command, ask for a
631 				 * hardware abort. This goes to the Task
632 				 * Management Request queue which will reset the
633 				 * task if it times out.
634 				 */
635 				ufshci_printf(ctrlr,
636 				    "Recovery step 1: Timeout occurred. aborting the task(%d).\n",
637 				    tr->req->request_upiu.header.task_tag);
638 				ufshci_ctrlr_cmd_send_task_mgmt_request(ctrlr,
639 				    ufshci_abort_complete, tr,
640 				    UFSHCI_TASK_MGMT_FUNCTION_ABORT_TASK,
641 				    tr->req->request_upiu.header.lun,
642 				    tr->req->request_upiu.header.task_tag, 0);
643 			} else {
644 				/* Recovery Step 2-5 */
645 				ufshci_req_queue_timeout_recovery(ctrlr, hwq);
646 				idle = false;
647 				break;
648 			}
649 		}
650 		mtx_unlock(&hwq->qlock);
651 		break;
652 
653 	case RECOVERY_WAITING:
654 		/*
655 		 * These messages aren't interesting while we're suspended. We
656 		 * put the queues into waiting state while suspending.
657 		 * Suspending takes a while, so we'll see these during that time
658 		 * and they aren't diagnostic. At other times, they indicate a
659 		 * problem that's worth complaining about.
660 		 */
661 		if (!device_is_suspended(ctrlr->dev))
662 			ufshci_printf(ctrlr, "Waiting for reset to complete\n");
663 		idle = false; /* We want to keep polling */
664 		break;
665 	}
666 
667 	/*
668 	 * Rearm the timeout.
669 	 */
670 	if (!idle) {
671 		callout_schedule_sbt(&hwq->timer, SBT_1S / 2, SBT_1S / 2, 0);
672 	} else {
673 		hwq->timer_armed = false;
674 	}
675 }
676 
677 /*
678  * Submit the tracker to the hardware.
679  */
680 static void
ufshci_req_queue_submit_tracker(struct ufshci_req_queue * req_queue,struct ufshci_tracker * tr,enum ufshci_data_direction data_direction)681 ufshci_req_queue_submit_tracker(struct ufshci_req_queue *req_queue,
682     struct ufshci_tracker *tr, enum ufshci_data_direction data_direction)
683 {
684 	struct ufshci_controller *ctrlr = req_queue->ctrlr;
685 	struct ufshci_request *req = tr->req;
686 	struct ufshci_hw_queue *hwq;
687 	uint64_t ucd_paddr;
688 	uint16_t request_len, response_off, response_len;
689 	uint8_t slot_num = tr->slot_num;
690 	int timeout;
691 
692 	hwq = req_queue->qops.get_hw_queue(req_queue);
693 
694 	mtx_assert(&hwq->qlock, MA_OWNED);
695 
696 	if (req->cb_fn == ufshci_completion_poll_cb)
697 		timeout = 1;
698 	else
699 		timeout = ctrlr->timeout_period;
700 	tr->deadline = getsbinuptime() + timeout * SBT_1S;
701 	if (!hwq->timer_armed) {
702 		hwq->timer_armed = true;
703 		/*
704 		 * It wakes up once every 0.5 seconds to check if the deadline
705 		 * has passed.
706 		 */
707 		callout_reset_sbt_on(&hwq->timer, SBT_1S / 2, SBT_1S / 2,
708 		    ufshci_req_queue_timeout, hwq, hwq->cpu, 0);
709 	}
710 
711 	if (req_queue->is_task_mgmt) {
712 		/* Prepare UTP Task Management Request Descriptor. */
713 		ufshci_req_queue_fill_utmr_descriptor(&tr->hwq->utmrd[slot_num],
714 		    req);
715 	} else {
716 		request_len = req->request_size;
717 		response_off = UFSHCI_UTP_XFER_REQ_SIZE;
718 		response_len = req->response_size;
719 
720 		/* Prepare UTP Command Descriptor */
721 		memcpy(tr->ucd, &req->request_upiu, request_len);
722 		memset((uint8_t *)tr->ucd + response_off, 0, response_len);
723 
724 		/* Prepare PRDT */
725 		if (req->payload_valid)
726 			ufshci_req_queue_prepare_prdt(tr);
727 
728 		/* Prepare UTP Transfer Request Descriptor. */
729 		ucd_paddr = tr->ucd_bus_addr;
730 		ufshci_req_queue_fill_utr_descriptor(&tr->hwq->utrd[slot_num],
731 		    data_direction, ucd_paddr, response_off, response_len,
732 		    tr->prdt_off, tr->prdt_entry_cnt);
733 
734 		bus_dmamap_sync(req_queue->dma_tag_ucd, req_queue->ucdmem_map,
735 		    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
736 	}
737 
738 	bus_dmamap_sync(tr->hwq->dma_tag_queue, tr->hwq->queuemem_map,
739 	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
740 
741 	tr->slot_state = UFSHCI_SLOT_STATE_SCHEDULED;
742 
743 	/* Ring the doorbell */
744 	req_queue->qops.ring_doorbell(ctrlr, tr);
745 }
746 
747 static int
_ufshci_req_queue_submit_request(struct ufshci_req_queue * req_queue,struct ufshci_request * req)748 _ufshci_req_queue_submit_request(struct ufshci_req_queue *req_queue,
749     struct ufshci_request *req)
750 {
751 	struct ufshci_tracker *tr = NULL;
752 	int error;
753 
754 	mtx_assert(&req_queue->qops.get_hw_queue(req_queue)->qlock, MA_OWNED);
755 
756 	error = req_queue->qops.reserve_slot(req_queue, &tr);
757 	if (error != 0) {
758 		ufshci_printf(req_queue->ctrlr, "Failed to get tracker");
759 		return (error);
760 	}
761 	KASSERT(tr, ("There is no tracker allocated."));
762 
763 	if (tr->slot_state == UFSHCI_SLOT_STATE_RESERVED ||
764 	    tr->slot_state == UFSHCI_SLOT_STATE_SCHEDULED)
765 		return (EBUSY);
766 
767 	/* Set the task_tag value to slot_num for traceability. */
768 	req->request_upiu.header.task_tag = tr->slot_num;
769 
770 	tr->slot_state = UFSHCI_SLOT_STATE_RESERVED;
771 	tr->response_size = req->response_size;
772 	tr->deadline = SBT_MAX;
773 	tr->req = req;
774 
775 	TAILQ_REMOVE(&tr->hwq->free_tr, tr, tailq);
776 	TAILQ_INSERT_TAIL(&tr->hwq->outstanding_tr, tr, tailq);
777 
778 	ufshci_req_queue_submit_tracker(req_queue, tr, req->data_direction);
779 
780 	return (0);
781 }
782 
783 int
ufshci_req_queue_submit_request(struct ufshci_req_queue * req_queue,struct ufshci_request * req,bool is_admin)784 ufshci_req_queue_submit_request(struct ufshci_req_queue *req_queue,
785     struct ufshci_request *req, bool is_admin)
786 {
787 	struct ufshci_hw_queue *hwq;
788 	uint32_t error;
789 
790 	/* TODO: MCQs should use a separate Admin queue. */
791 
792 	hwq = req_queue->qops.get_hw_queue(req_queue);
793 	KASSERT(hwq, ("There is no HW queue allocated."));
794 
795 	mtx_lock(&hwq->qlock);
796 	error = _ufshci_req_queue_submit_request(req_queue, req);
797 	mtx_unlock(&hwq->qlock);
798 
799 	return (error);
800 }
801