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Merge tag 'tag-chrome-platform-for-v5.10' of git://git.kernel.org/pub/scm/linux/kerne...
[mirror_ubuntu-jammy-kernel.git] / drivers / block / skd_main.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for sTec s1120 PCIe SSDs. sTec was acquired in 2013 by HGST and HGST
4 * was acquired by Western Digital in 2012.
5 *
6 * Copyright 2012 sTec, Inc.
7 * Copyright (c) 2017 Western Digital Corporation or its affiliates.
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/pci.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16 #include <linux/blkdev.h>
17 #include <linux/blk-mq.h>
18 #include <linux/sched.h>
19 #include <linux/interrupt.h>
20 #include <linux/compiler.h>
21 #include <linux/workqueue.h>
22 #include <linux/delay.h>
23 #include <linux/time.h>
24 #include <linux/hdreg.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/completion.h>
27 #include <linux/scatterlist.h>
28 #include <linux/version.h>
29 #include <linux/err.h>
30 #include <linux/aer.h>
31 #include <linux/wait.h>
32 #include <linux/stringify.h>
33 #include <scsi/scsi.h>
34 #include <scsi/sg.h>
35 #include <linux/io.h>
36 #include <linux/uaccess.h>
37 #include <asm/unaligned.h>
38
39 #include "skd_s1120.h"
40
41 static int skd_dbg_level;
42 static int skd_isr_comp_limit = 4;
43
44 #define SKD_ASSERT(expr) \
45 do { \
46 if (unlikely(!(expr))) { \
47 pr_err("Assertion failed! %s,%s,%s,line=%d\n", \
48 # expr, __FILE__, __func__, __LINE__); \
49 } \
50 } while (0)
51
52 #define DRV_NAME "skd"
53 #define PFX DRV_NAME ": "
54
55 MODULE_LICENSE("GPL");
56
57 MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver");
58
59 #define PCI_VENDOR_ID_STEC 0x1B39
60 #define PCI_DEVICE_ID_S1120 0x0001
61
62 #define SKD_FUA_NV (1 << 1)
63 #define SKD_MINORS_PER_DEVICE 16
64
65 #define SKD_MAX_QUEUE_DEPTH 200u
66
67 #define SKD_PAUSE_TIMEOUT (5 * 1000)
68
69 #define SKD_N_FITMSG_BYTES (512u)
70 #define SKD_MAX_REQ_PER_MSG 14
71
72 #define SKD_N_SPECIAL_FITMSG_BYTES (128u)
73
74 /* SG elements are 32 bytes, so we can make this 4096 and still be under the
75 * 128KB limit. That allows 4096*4K = 16M xfer size
76 */
77 #define SKD_N_SG_PER_REQ_DEFAULT 256u
78
79 #define SKD_N_COMPLETION_ENTRY 256u
80 #define SKD_N_READ_CAP_BYTES (8u)
81
82 #define SKD_N_INTERNAL_BYTES (512u)
83
84 #define SKD_SKCOMP_SIZE \
85 ((sizeof(struct fit_completion_entry_v1) + \
86 sizeof(struct fit_comp_error_info)) * SKD_N_COMPLETION_ENTRY)
87
88 /* 5 bits of uniqifier, 0xF800 */
89 #define SKD_ID_TABLE_MASK (3u << 8u)
90 #define SKD_ID_RW_REQUEST (0u << 8u)
91 #define SKD_ID_INTERNAL (1u << 8u)
92 #define SKD_ID_FIT_MSG (3u << 8u)
93 #define SKD_ID_SLOT_MASK 0x00FFu
94 #define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu
95
96 #define SKD_N_MAX_SECTORS 2048u
97
98 #define SKD_MAX_RETRIES 2u
99
100 #define SKD_TIMER_SECONDS(seconds) (seconds)
101 #define SKD_TIMER_MINUTES(minutes) ((minutes) * (60))
102
103 #define INQ_STD_NBYTES 36
104
105 enum skd_drvr_state {
106 SKD_DRVR_STATE_LOAD,
107 SKD_DRVR_STATE_IDLE,
108 SKD_DRVR_STATE_BUSY,
109 SKD_DRVR_STATE_STARTING,
110 SKD_DRVR_STATE_ONLINE,
111 SKD_DRVR_STATE_PAUSING,
112 SKD_DRVR_STATE_PAUSED,
113 SKD_DRVR_STATE_RESTARTING,
114 SKD_DRVR_STATE_RESUMING,
115 SKD_DRVR_STATE_STOPPING,
116 SKD_DRVR_STATE_FAULT,
117 SKD_DRVR_STATE_DISAPPEARED,
118 SKD_DRVR_STATE_PROTOCOL_MISMATCH,
119 SKD_DRVR_STATE_BUSY_ERASE,
120 SKD_DRVR_STATE_BUSY_SANITIZE,
121 SKD_DRVR_STATE_BUSY_IMMINENT,
122 SKD_DRVR_STATE_WAIT_BOOT,
123 SKD_DRVR_STATE_SYNCING,
124 };
125
126 #define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u)
127 #define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u)
128 #define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u)
129 #define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u)
130 #define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u)
131 #define SKD_START_WAIT_SECONDS 90u
132
133 enum skd_req_state {
134 SKD_REQ_STATE_IDLE,
135 SKD_REQ_STATE_SETUP,
136 SKD_REQ_STATE_BUSY,
137 SKD_REQ_STATE_COMPLETED,
138 SKD_REQ_STATE_TIMEOUT,
139 };
140
141 enum skd_check_status_action {
142 SKD_CHECK_STATUS_REPORT_GOOD,
143 SKD_CHECK_STATUS_REPORT_SMART_ALERT,
144 SKD_CHECK_STATUS_REQUEUE_REQUEST,
145 SKD_CHECK_STATUS_REPORT_ERROR,
146 SKD_CHECK_STATUS_BUSY_IMMINENT,
147 };
148
149 struct skd_msg_buf {
150 struct fit_msg_hdr fmh;
151 struct skd_scsi_request scsi[SKD_MAX_REQ_PER_MSG];
152 };
153
154 struct skd_fitmsg_context {
155 u32 id;
156
157 u32 length;
158
159 struct skd_msg_buf *msg_buf;
160 dma_addr_t mb_dma_address;
161 };
162
163 struct skd_request_context {
164 enum skd_req_state state;
165
166 u16 id;
167 u32 fitmsg_id;
168
169 u8 flush_cmd;
170
171 enum dma_data_direction data_dir;
172 struct scatterlist *sg;
173 u32 n_sg;
174 u32 sg_byte_count;
175
176 struct fit_sg_descriptor *sksg_list;
177 dma_addr_t sksg_dma_address;
178
179 struct fit_completion_entry_v1 completion;
180
181 struct fit_comp_error_info err_info;
182 int retries;
183
184 blk_status_t status;
185 };
186
187 struct skd_special_context {
188 struct skd_request_context req;
189
190 void *data_buf;
191 dma_addr_t db_dma_address;
192
193 struct skd_msg_buf *msg_buf;
194 dma_addr_t mb_dma_address;
195 };
196
197 typedef enum skd_irq_type {
198 SKD_IRQ_LEGACY,
199 SKD_IRQ_MSI,
200 SKD_IRQ_MSIX
201 } skd_irq_type_t;
202
203 #define SKD_MAX_BARS 2
204
205 struct skd_device {
206 void __iomem *mem_map[SKD_MAX_BARS];
207 resource_size_t mem_phys[SKD_MAX_BARS];
208 u32 mem_size[SKD_MAX_BARS];
209
210 struct skd_msix_entry *msix_entries;
211
212 struct pci_dev *pdev;
213 int pcie_error_reporting_is_enabled;
214
215 spinlock_t lock;
216 struct gendisk *disk;
217 struct blk_mq_tag_set tag_set;
218 struct request_queue *queue;
219 struct skd_fitmsg_context *skmsg;
220 struct device *class_dev;
221 int gendisk_on;
222 int sync_done;
223
224 u32 devno;
225 u32 major;
226 char isr_name[30];
227
228 enum skd_drvr_state state;
229 u32 drive_state;
230
231 u32 cur_max_queue_depth;
232 u32 queue_low_water_mark;
233 u32 dev_max_queue_depth;
234
235 u32 num_fitmsg_context;
236 u32 num_req_context;
237
238 struct skd_fitmsg_context *skmsg_table;
239
240 struct skd_special_context internal_skspcl;
241 u32 read_cap_blocksize;
242 u32 read_cap_last_lba;
243 int read_cap_is_valid;
244 int inquiry_is_valid;
245 u8 inq_serial_num[13]; /*12 chars plus null term */
246
247 u8 skcomp_cycle;
248 u32 skcomp_ix;
249 struct kmem_cache *msgbuf_cache;
250 struct kmem_cache *sglist_cache;
251 struct kmem_cache *databuf_cache;
252 struct fit_completion_entry_v1 *skcomp_table;
253 struct fit_comp_error_info *skerr_table;
254 dma_addr_t cq_dma_address;
255
256 wait_queue_head_t waitq;
257
258 struct timer_list timer;
259 u32 timer_countdown;
260 u32 timer_substate;
261
262 int sgs_per_request;
263 u32 last_mtd;
264
265 u32 proto_ver;
266
267 int dbg_level;
268 u32 connect_time_stamp;
269 int connect_retries;
270 #define SKD_MAX_CONNECT_RETRIES 16
271 u32 drive_jiffies;
272
273 u32 timo_slot;
274
275 struct work_struct start_queue;
276 struct work_struct completion_worker;
277 };
278
279 #define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF)
280 #define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF)
281 #define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF)
282
283 static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset)
284 {
285 u32 val = readl(skdev->mem_map[1] + offset);
286
287 if (unlikely(skdev->dbg_level >= 2))
288 dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
289 return val;
290 }
291
292 static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
293 u32 offset)
294 {
295 writel(val, skdev->mem_map[1] + offset);
296 if (unlikely(skdev->dbg_level >= 2))
297 dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
298 }
299
300 static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
301 u32 offset)
302 {
303 writeq(val, skdev->mem_map[1] + offset);
304 if (unlikely(skdev->dbg_level >= 2))
305 dev_dbg(&skdev->pdev->dev, "offset %x = %016llx\n", offset,
306 val);
307 }
308
309
310 #define SKD_IRQ_DEFAULT SKD_IRQ_MSIX
311 static int skd_isr_type = SKD_IRQ_DEFAULT;
312
313 module_param(skd_isr_type, int, 0444);
314 MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability."
315 " (0==legacy, 1==MSI, 2==MSI-X, default==1)");
316
317 #define SKD_MAX_REQ_PER_MSG_DEFAULT 1
318 static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
319
320 module_param(skd_max_req_per_msg, int, 0444);
321 MODULE_PARM_DESC(skd_max_req_per_msg,
322 "Maximum SCSI requests packed in a single message."
323 " (1-" __stringify(SKD_MAX_REQ_PER_MSG) ", default==1)");
324
325 #define SKD_MAX_QUEUE_DEPTH_DEFAULT 64
326 #define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64"
327 static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
328
329 module_param(skd_max_queue_depth, int, 0444);
330 MODULE_PARM_DESC(skd_max_queue_depth,
331 "Maximum SCSI requests issued to s1120."
332 " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")");
333
334 static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
335 module_param(skd_sgs_per_request, int, 0444);
336 MODULE_PARM_DESC(skd_sgs_per_request,
337 "Maximum SG elements per block request."
338 " (1-4096, default==256)");
339
340 static int skd_max_pass_thru = 1;
341 module_param(skd_max_pass_thru, int, 0444);
342 MODULE_PARM_DESC(skd_max_pass_thru,
343 "Maximum SCSI pass-thru at a time. IGNORED");
344
345 module_param(skd_dbg_level, int, 0444);
346 MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)");
347
348 module_param(skd_isr_comp_limit, int, 0444);
349 MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4");
350
351 /* Major device number dynamically assigned. */
352 static u32 skd_major;
353
354 static void skd_destruct(struct skd_device *skdev);
355 static const struct block_device_operations skd_blockdev_ops;
356 static void skd_send_fitmsg(struct skd_device *skdev,
357 struct skd_fitmsg_context *skmsg);
358 static void skd_send_special_fitmsg(struct skd_device *skdev,
359 struct skd_special_context *skspcl);
360 static bool skd_preop_sg_list(struct skd_device *skdev,
361 struct skd_request_context *skreq);
362 static void skd_postop_sg_list(struct skd_device *skdev,
363 struct skd_request_context *skreq);
364
365 static void skd_restart_device(struct skd_device *skdev);
366 static int skd_quiesce_dev(struct skd_device *skdev);
367 static int skd_unquiesce_dev(struct skd_device *skdev);
368 static void skd_disable_interrupts(struct skd_device *skdev);
369 static void skd_isr_fwstate(struct skd_device *skdev);
370 static void skd_recover_requests(struct skd_device *skdev);
371 static void skd_soft_reset(struct skd_device *skdev);
372
373 const char *skd_drive_state_to_str(int state);
374 const char *skd_skdev_state_to_str(enum skd_drvr_state state);
375 static void skd_log_skdev(struct skd_device *skdev, const char *event);
376 static void skd_log_skreq(struct skd_device *skdev,
377 struct skd_request_context *skreq, const char *event);
378
379 /*
380 *****************************************************************************
381 * READ/WRITE REQUESTS
382 *****************************************************************************
383 */
384 static bool skd_inc_in_flight(struct request *rq, void *data, bool reserved)
385 {
386 int *count = data;
387
388 count++;
389 return true;
390 }
391
392 static int skd_in_flight(struct skd_device *skdev)
393 {
394 int count = 0;
395
396 blk_mq_tagset_busy_iter(&skdev->tag_set, skd_inc_in_flight, &count);
397
398 return count;
399 }
400
401 static void
402 skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
403 int data_dir, unsigned lba,
404 unsigned count)
405 {
406 if (data_dir == READ)
407 scsi_req->cdb[0] = READ_10;
408 else
409 scsi_req->cdb[0] = WRITE_10;
410
411 scsi_req->cdb[1] = 0;
412 scsi_req->cdb[2] = (lba & 0xff000000) >> 24;
413 scsi_req->cdb[3] = (lba & 0xff0000) >> 16;
414 scsi_req->cdb[4] = (lba & 0xff00) >> 8;
415 scsi_req->cdb[5] = (lba & 0xff);
416 scsi_req->cdb[6] = 0;
417 scsi_req->cdb[7] = (count & 0xff00) >> 8;
418 scsi_req->cdb[8] = count & 0xff;
419 scsi_req->cdb[9] = 0;
420 }
421
422 static void
423 skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req,
424 struct skd_request_context *skreq)
425 {
426 skreq->flush_cmd = 1;
427
428 scsi_req->cdb[0] = SYNCHRONIZE_CACHE;
429 scsi_req->cdb[1] = 0;
430 scsi_req->cdb[2] = 0;
431 scsi_req->cdb[3] = 0;
432 scsi_req->cdb[4] = 0;
433 scsi_req->cdb[5] = 0;
434 scsi_req->cdb[6] = 0;
435 scsi_req->cdb[7] = 0;
436 scsi_req->cdb[8] = 0;
437 scsi_req->cdb[9] = 0;
438 }
439
440 /*
441 * Return true if and only if all pending requests should be failed.
442 */
443 static bool skd_fail_all(struct request_queue *q)
444 {
445 struct skd_device *skdev = q->queuedata;
446
447 SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE);
448
449 skd_log_skdev(skdev, "req_not_online");
450 switch (skdev->state) {
451 case SKD_DRVR_STATE_PAUSING:
452 case SKD_DRVR_STATE_PAUSED:
453 case SKD_DRVR_STATE_STARTING:
454 case SKD_DRVR_STATE_RESTARTING:
455 case SKD_DRVR_STATE_WAIT_BOOT:
456 /* In case of starting, we haven't started the queue,
457 * so we can't get here... but requests are
458 * possibly hanging out waiting for us because we
459 * reported the dev/skd0 already. They'll wait
460 * forever if connect doesn't complete.
461 * What to do??? delay dev/skd0 ??
462 */
463 case SKD_DRVR_STATE_BUSY:
464 case SKD_DRVR_STATE_BUSY_IMMINENT:
465 case SKD_DRVR_STATE_BUSY_ERASE:
466 return false;
467
468 case SKD_DRVR_STATE_BUSY_SANITIZE:
469 case SKD_DRVR_STATE_STOPPING:
470 case SKD_DRVR_STATE_SYNCING:
471 case SKD_DRVR_STATE_FAULT:
472 case SKD_DRVR_STATE_DISAPPEARED:
473 default:
474 return true;
475 }
476 }
477
478 static blk_status_t skd_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
479 const struct blk_mq_queue_data *mqd)
480 {
481 struct request *const req = mqd->rq;
482 struct request_queue *const q = req->q;
483 struct skd_device *skdev = q->queuedata;
484 struct skd_fitmsg_context *skmsg;
485 struct fit_msg_hdr *fmh;
486 const u32 tag = blk_mq_unique_tag(req);
487 struct skd_request_context *const skreq = blk_mq_rq_to_pdu(req);
488 struct skd_scsi_request *scsi_req;
489 unsigned long flags = 0;
490 const u32 lba = blk_rq_pos(req);
491 const u32 count = blk_rq_sectors(req);
492 const int data_dir = rq_data_dir(req);
493
494 if (unlikely(skdev->state != SKD_DRVR_STATE_ONLINE))
495 return skd_fail_all(q) ? BLK_STS_IOERR : BLK_STS_RESOURCE;
496
497 if (!(req->rq_flags & RQF_DONTPREP)) {
498 skreq->retries = 0;
499 req->rq_flags |= RQF_DONTPREP;
500 }
501
502 blk_mq_start_request(req);
503
504 WARN_ONCE(tag >= skd_max_queue_depth, "%#x > %#x (nr_requests = %lu)\n",
505 tag, skd_max_queue_depth, q->nr_requests);
506
507 SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
508
509 dev_dbg(&skdev->pdev->dev,
510 "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba,
511 lba, count, count, data_dir);
512
513 skreq->id = tag + SKD_ID_RW_REQUEST;
514 skreq->flush_cmd = 0;
515 skreq->n_sg = 0;
516 skreq->sg_byte_count = 0;
517
518 skreq->fitmsg_id = 0;
519
520 skreq->data_dir = data_dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
521
522 if (req->bio && !skd_preop_sg_list(skdev, skreq)) {
523 dev_dbg(&skdev->pdev->dev, "error Out\n");
524 skreq->status = BLK_STS_RESOURCE;
525 blk_mq_complete_request(req);
526 return BLK_STS_OK;
527 }
528
529 dma_sync_single_for_device(&skdev->pdev->dev, skreq->sksg_dma_address,
530 skreq->n_sg *
531 sizeof(struct fit_sg_descriptor),
532 DMA_TO_DEVICE);
533
534 /* Either a FIT msg is in progress or we have to start one. */
535 if (skd_max_req_per_msg == 1) {
536 skmsg = NULL;
537 } else {
538 spin_lock_irqsave(&skdev->lock, flags);
539 skmsg = skdev->skmsg;
540 }
541 if (!skmsg) {
542 skmsg = &skdev->skmsg_table[tag];
543 skdev->skmsg = skmsg;
544
545 /* Initialize the FIT msg header */
546 fmh = &skmsg->msg_buf->fmh;
547 memset(fmh, 0, sizeof(*fmh));
548 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
549 skmsg->length = sizeof(*fmh);
550 } else {
551 fmh = &skmsg->msg_buf->fmh;
552 }
553
554 skreq->fitmsg_id = skmsg->id;
555
556 scsi_req = &skmsg->msg_buf->scsi[fmh->num_protocol_cmds_coalesced];
557 memset(scsi_req, 0, sizeof(*scsi_req));
558
559 scsi_req->hdr.tag = skreq->id;
560 scsi_req->hdr.sg_list_dma_address =
561 cpu_to_be64(skreq->sksg_dma_address);
562
563 if (req_op(req) == REQ_OP_FLUSH) {
564 skd_prep_zerosize_flush_cdb(scsi_req, skreq);
565 SKD_ASSERT(skreq->flush_cmd == 1);
566 } else {
567 skd_prep_rw_cdb(scsi_req, data_dir, lba, count);
568 }
569
570 if (req->cmd_flags & REQ_FUA)
571 scsi_req->cdb[1] |= SKD_FUA_NV;
572
573 scsi_req->hdr.sg_list_len_bytes = cpu_to_be32(skreq->sg_byte_count);
574
575 /* Complete resource allocations. */
576 skreq->state = SKD_REQ_STATE_BUSY;
577
578 skmsg->length += sizeof(struct skd_scsi_request);
579 fmh->num_protocol_cmds_coalesced++;
580
581 dev_dbg(&skdev->pdev->dev, "req=0x%x busy=%d\n", skreq->id,
582 skd_in_flight(skdev));
583
584 /*
585 * If the FIT msg buffer is full send it.
586 */
587 if (skd_max_req_per_msg == 1) {
588 skd_send_fitmsg(skdev, skmsg);
589 } else {
590 if (mqd->last ||
591 fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
592 skd_send_fitmsg(skdev, skmsg);
593 skdev->skmsg = NULL;
594 }
595 spin_unlock_irqrestore(&skdev->lock, flags);
596 }
597
598 return BLK_STS_OK;
599 }
600
601 static enum blk_eh_timer_return skd_timed_out(struct request *req,
602 bool reserved)
603 {
604 struct skd_device *skdev = req->q->queuedata;
605
606 dev_err(&skdev->pdev->dev, "request with tag %#x timed out\n",
607 blk_mq_unique_tag(req));
608
609 return BLK_EH_RESET_TIMER;
610 }
611
612 static void skd_complete_rq(struct request *req)
613 {
614 struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
615
616 blk_mq_end_request(req, skreq->status);
617 }
618
619 static bool skd_preop_sg_list(struct skd_device *skdev,
620 struct skd_request_context *skreq)
621 {
622 struct request *req = blk_mq_rq_from_pdu(skreq);
623 struct scatterlist *sgl = &skreq->sg[0], *sg;
624 int n_sg;
625 int i;
626
627 skreq->sg_byte_count = 0;
628
629 WARN_ON_ONCE(skreq->data_dir != DMA_TO_DEVICE &&
630 skreq->data_dir != DMA_FROM_DEVICE);
631
632 n_sg = blk_rq_map_sg(skdev->queue, req, sgl);
633 if (n_sg <= 0)
634 return false;
635
636 /*
637 * Map scatterlist to PCI bus addresses.
638 * Note PCI might change the number of entries.
639 */
640 n_sg = dma_map_sg(&skdev->pdev->dev, sgl, n_sg, skreq->data_dir);
641 if (n_sg <= 0)
642 return false;
643
644 SKD_ASSERT(n_sg <= skdev->sgs_per_request);
645
646 skreq->n_sg = n_sg;
647
648 for_each_sg(sgl, sg, n_sg, i) {
649 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
650 u32 cnt = sg_dma_len(sg);
651 uint64_t dma_addr = sg_dma_address(sg);
652
653 sgd->control = FIT_SGD_CONTROL_NOT_LAST;
654 sgd->byte_count = cnt;
655 skreq->sg_byte_count += cnt;
656 sgd->host_side_addr = dma_addr;
657 sgd->dev_side_addr = 0;
658 }
659
660 skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
661 skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
662
663 if (unlikely(skdev->dbg_level > 1)) {
664 dev_dbg(&skdev->pdev->dev,
665 "skreq=%x sksg_list=%p sksg_dma=%pad\n",
666 skreq->id, skreq->sksg_list, &skreq->sksg_dma_address);
667 for (i = 0; i < n_sg; i++) {
668 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
669
670 dev_dbg(&skdev->pdev->dev,
671 " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
672 i, sgd->byte_count, sgd->control,
673 sgd->host_side_addr, sgd->next_desc_ptr);
674 }
675 }
676
677 return true;
678 }
679
680 static void skd_postop_sg_list(struct skd_device *skdev,
681 struct skd_request_context *skreq)
682 {
683 /*
684 * restore the next ptr for next IO request so we
685 * don't have to set it every time.
686 */
687 skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
688 skreq->sksg_dma_address +
689 ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
690 dma_unmap_sg(&skdev->pdev->dev, &skreq->sg[0], skreq->n_sg,
691 skreq->data_dir);
692 }
693
694 /*
695 *****************************************************************************
696 * TIMER
697 *****************************************************************************
698 */
699
700 static void skd_timer_tick_not_online(struct skd_device *skdev);
701
702 static void skd_start_queue(struct work_struct *work)
703 {
704 struct skd_device *skdev = container_of(work, typeof(*skdev),
705 start_queue);
706
707 /*
708 * Although it is safe to call blk_start_queue() from interrupt
709 * context, blk_mq_start_hw_queues() must not be called from
710 * interrupt context.
711 */
712 blk_mq_start_hw_queues(skdev->queue);
713 }
714
715 static void skd_timer_tick(struct timer_list *t)
716 {
717 struct skd_device *skdev = from_timer(skdev, t, timer);
718 unsigned long reqflags;
719 u32 state;
720
721 if (skdev->state == SKD_DRVR_STATE_FAULT)
722 /* The driver has declared fault, and we want it to
723 * stay that way until driver is reloaded.
724 */
725 return;
726
727 spin_lock_irqsave(&skdev->lock, reqflags);
728
729 state = SKD_READL(skdev, FIT_STATUS);
730 state &= FIT_SR_DRIVE_STATE_MASK;
731 if (state != skdev->drive_state)
732 skd_isr_fwstate(skdev);
733
734 if (skdev->state != SKD_DRVR_STATE_ONLINE)
735 skd_timer_tick_not_online(skdev);
736
737 mod_timer(&skdev->timer, (jiffies + HZ));
738
739 spin_unlock_irqrestore(&skdev->lock, reqflags);
740 }
741
742 static void skd_timer_tick_not_online(struct skd_device *skdev)
743 {
744 switch (skdev->state) {
745 case SKD_DRVR_STATE_IDLE:
746 case SKD_DRVR_STATE_LOAD:
747 break;
748 case SKD_DRVR_STATE_BUSY_SANITIZE:
749 dev_dbg(&skdev->pdev->dev,
750 "drive busy sanitize[%x], driver[%x]\n",
751 skdev->drive_state, skdev->state);
752 /* If we've been in sanitize for 3 seconds, we figure we're not
753 * going to get anymore completions, so recover requests now
754 */
755 if (skdev->timer_countdown > 0) {
756 skdev->timer_countdown--;
757 return;
758 }
759 skd_recover_requests(skdev);
760 break;
761
762 case SKD_DRVR_STATE_BUSY:
763 case SKD_DRVR_STATE_BUSY_IMMINENT:
764 case SKD_DRVR_STATE_BUSY_ERASE:
765 dev_dbg(&skdev->pdev->dev, "busy[%x], countdown=%d\n",
766 skdev->state, skdev->timer_countdown);
767 if (skdev->timer_countdown > 0) {
768 skdev->timer_countdown--;
769 return;
770 }
771 dev_dbg(&skdev->pdev->dev,
772 "busy[%x], timedout=%d, restarting device.",
773 skdev->state, skdev->timer_countdown);
774 skd_restart_device(skdev);
775 break;
776
777 case SKD_DRVR_STATE_WAIT_BOOT:
778 case SKD_DRVR_STATE_STARTING:
779 if (skdev->timer_countdown > 0) {
780 skdev->timer_countdown--;
781 return;
782 }
783 /* For now, we fault the drive. Could attempt resets to
784 * revcover at some point. */
785 skdev->state = SKD_DRVR_STATE_FAULT;
786
787 dev_err(&skdev->pdev->dev, "DriveFault Connect Timeout (%x)\n",
788 skdev->drive_state);
789
790 /*start the queue so we can respond with error to requests */
791 /* wakeup anyone waiting for startup complete */
792 schedule_work(&skdev->start_queue);
793 skdev->gendisk_on = -1;
794 wake_up_interruptible(&skdev->waitq);
795 break;
796
797 case SKD_DRVR_STATE_ONLINE:
798 /* shouldn't get here. */
799 break;
800
801 case SKD_DRVR_STATE_PAUSING:
802 case SKD_DRVR_STATE_PAUSED:
803 break;
804
805 case SKD_DRVR_STATE_RESTARTING:
806 if (skdev->timer_countdown > 0) {
807 skdev->timer_countdown--;
808 return;
809 }
810 /* For now, we fault the drive. Could attempt resets to
811 * revcover at some point. */
812 skdev->state = SKD_DRVR_STATE_FAULT;
813 dev_err(&skdev->pdev->dev,
814 "DriveFault Reconnect Timeout (%x)\n",
815 skdev->drive_state);
816
817 /*
818 * Recovering does two things:
819 * 1. completes IO with error
820 * 2. reclaims dma resources
821 * When is it safe to recover requests?
822 * - if the drive state is faulted
823 * - if the state is still soft reset after out timeout
824 * - if the drive registers are dead (state = FF)
825 * If it is "unsafe", we still need to recover, so we will
826 * disable pci bus mastering and disable our interrupts.
827 */
828
829 if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) ||
830 (skdev->drive_state == FIT_SR_DRIVE_FAULT) ||
831 (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK))
832 /* It never came out of soft reset. Try to
833 * recover the requests and then let them
834 * fail. This is to mitigate hung processes. */
835 skd_recover_requests(skdev);
836 else {
837 dev_err(&skdev->pdev->dev, "Disable BusMaster (%x)\n",
838 skdev->drive_state);
839 pci_disable_device(skdev->pdev);
840 skd_disable_interrupts(skdev);
841 skd_recover_requests(skdev);
842 }
843
844 /*start the queue so we can respond with error to requests */
845 /* wakeup anyone waiting for startup complete */
846 schedule_work(&skdev->start_queue);
847 skdev->gendisk_on = -1;
848 wake_up_interruptible(&skdev->waitq);
849 break;
850
851 case SKD_DRVR_STATE_RESUMING:
852 case SKD_DRVR_STATE_STOPPING:
853 case SKD_DRVR_STATE_SYNCING:
854 case SKD_DRVR_STATE_FAULT:
855 case SKD_DRVR_STATE_DISAPPEARED:
856 default:
857 break;
858 }
859 }
860
861 static int skd_start_timer(struct skd_device *skdev)
862 {
863 int rc;
864
865 timer_setup(&skdev->timer, skd_timer_tick, 0);
866
867 rc = mod_timer(&skdev->timer, (jiffies + HZ));
868 if (rc)
869 dev_err(&skdev->pdev->dev, "failed to start timer %d\n", rc);
870 return rc;
871 }
872
873 static void skd_kill_timer(struct skd_device *skdev)
874 {
875 del_timer_sync(&skdev->timer);
876 }
877
878 /*
879 *****************************************************************************
880 * INTERNAL REQUESTS -- generated by driver itself
881 *****************************************************************************
882 */
883
884 static int skd_format_internal_skspcl(struct skd_device *skdev)
885 {
886 struct skd_special_context *skspcl = &skdev->internal_skspcl;
887 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
888 struct fit_msg_hdr *fmh;
889 uint64_t dma_address;
890 struct skd_scsi_request *scsi;
891
892 fmh = &skspcl->msg_buf->fmh;
893 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
894 fmh->num_protocol_cmds_coalesced = 1;
895
896 scsi = &skspcl->msg_buf->scsi[0];
897 memset(scsi, 0, sizeof(*scsi));
898 dma_address = skspcl->req.sksg_dma_address;
899 scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
900 skspcl->req.n_sg = 1;
901 sgd->control = FIT_SGD_CONTROL_LAST;
902 sgd->byte_count = 0;
903 sgd->host_side_addr = skspcl->db_dma_address;
904 sgd->dev_side_addr = 0;
905 sgd->next_desc_ptr = 0LL;
906
907 return 1;
908 }
909
910 #define WR_BUF_SIZE SKD_N_INTERNAL_BYTES
911
912 static void skd_send_internal_skspcl(struct skd_device *skdev,
913 struct skd_special_context *skspcl,
914 u8 opcode)
915 {
916 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
917 struct skd_scsi_request *scsi;
918 unsigned char *buf = skspcl->data_buf;
919 int i;
920
921 if (skspcl->req.state != SKD_REQ_STATE_IDLE)
922 /*
923 * A refresh is already in progress.
924 * Just wait for it to finish.
925 */
926 return;
927
928 skspcl->req.state = SKD_REQ_STATE_BUSY;
929
930 scsi = &skspcl->msg_buf->scsi[0];
931 scsi->hdr.tag = skspcl->req.id;
932
933 memset(scsi->cdb, 0, sizeof(scsi->cdb));
934
935 switch (opcode) {
936 case TEST_UNIT_READY:
937 scsi->cdb[0] = TEST_UNIT_READY;
938 sgd->byte_count = 0;
939 scsi->hdr.sg_list_len_bytes = 0;
940 break;
941
942 case READ_CAPACITY:
943 scsi->cdb[0] = READ_CAPACITY;
944 sgd->byte_count = SKD_N_READ_CAP_BYTES;
945 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
946 break;
947
948 case INQUIRY:
949 scsi->cdb[0] = INQUIRY;
950 scsi->cdb[1] = 0x01; /* evpd */
951 scsi->cdb[2] = 0x80; /* serial number page */
952 scsi->cdb[4] = 0x10;
953 sgd->byte_count = 16;
954 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
955 break;
956
957 case SYNCHRONIZE_CACHE:
958 scsi->cdb[0] = SYNCHRONIZE_CACHE;
959 sgd->byte_count = 0;
960 scsi->hdr.sg_list_len_bytes = 0;
961 break;
962
963 case WRITE_BUFFER:
964 scsi->cdb[0] = WRITE_BUFFER;
965 scsi->cdb[1] = 0x02;
966 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
967 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
968 sgd->byte_count = WR_BUF_SIZE;
969 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
970 /* fill incrementing byte pattern */
971 for (i = 0; i < sgd->byte_count; i++)
972 buf[i] = i & 0xFF;
973 break;
974
975 case READ_BUFFER:
976 scsi->cdb[0] = READ_BUFFER;
977 scsi->cdb[1] = 0x02;
978 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
979 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
980 sgd->byte_count = WR_BUF_SIZE;
981 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
982 memset(skspcl->data_buf, 0, sgd->byte_count);
983 break;
984
985 default:
986 SKD_ASSERT("Don't know what to send");
987 return;
988
989 }
990 skd_send_special_fitmsg(skdev, skspcl);
991 }
992
993 static void skd_refresh_device_data(struct skd_device *skdev)
994 {
995 struct skd_special_context *skspcl = &skdev->internal_skspcl;
996
997 skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY);
998 }
999
1000 static int skd_chk_read_buf(struct skd_device *skdev,
1001 struct skd_special_context *skspcl)
1002 {
1003 unsigned char *buf = skspcl->data_buf;
1004 int i;
1005
1006 /* check for incrementing byte pattern */
1007 for (i = 0; i < WR_BUF_SIZE; i++)
1008 if (buf[i] != (i & 0xFF))
1009 return 1;
1010
1011 return 0;
1012 }
1013
1014 static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key,
1015 u8 code, u8 qual, u8 fruc)
1016 {
1017 /* If the check condition is of special interest, log a message */
1018 if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02)
1019 && (code == 0x04) && (qual == 0x06)) {
1020 dev_err(&skdev->pdev->dev,
1021 "*** LOST_WRITE_DATA ERROR *** key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
1022 key, code, qual, fruc);
1023 }
1024 }
1025
1026 static void skd_complete_internal(struct skd_device *skdev,
1027 struct fit_completion_entry_v1 *skcomp,
1028 struct fit_comp_error_info *skerr,
1029 struct skd_special_context *skspcl)
1030 {
1031 u8 *buf = skspcl->data_buf;
1032 u8 status;
1033 int i;
1034 struct skd_scsi_request *scsi = &skspcl->msg_buf->scsi[0];
1035
1036 lockdep_assert_held(&skdev->lock);
1037
1038 SKD_ASSERT(skspcl == &skdev->internal_skspcl);
1039
1040 dev_dbg(&skdev->pdev->dev, "complete internal %x\n", scsi->cdb[0]);
1041
1042 dma_sync_single_for_cpu(&skdev->pdev->dev,
1043 skspcl->db_dma_address,
1044 skspcl->req.sksg_list[0].byte_count,
1045 DMA_BIDIRECTIONAL);
1046
1047 skspcl->req.completion = *skcomp;
1048 skspcl->req.state = SKD_REQ_STATE_IDLE;
1049
1050 status = skspcl->req.completion.status;
1051
1052 skd_log_check_status(skdev, status, skerr->key, skerr->code,
1053 skerr->qual, skerr->fruc);
1054
1055 switch (scsi->cdb[0]) {
1056 case TEST_UNIT_READY:
1057 if (status == SAM_STAT_GOOD)
1058 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
1059 else if ((status == SAM_STAT_CHECK_CONDITION) &&
1060 (skerr->key == MEDIUM_ERROR))
1061 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
1062 else {
1063 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1064 dev_dbg(&skdev->pdev->dev,
1065 "TUR failed, don't send anymore state 0x%x\n",
1066 skdev->state);
1067 return;
1068 }
1069 dev_dbg(&skdev->pdev->dev,
1070 "**** TUR failed, retry skerr\n");
1071 skd_send_internal_skspcl(skdev, skspcl,
1072 TEST_UNIT_READY);
1073 }
1074 break;
1075
1076 case WRITE_BUFFER:
1077 if (status == SAM_STAT_GOOD)
1078 skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER);
1079 else {
1080 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1081 dev_dbg(&skdev->pdev->dev,
1082 "write buffer failed, don't send anymore state 0x%x\n",
1083 skdev->state);
1084 return;
1085 }
1086 dev_dbg(&skdev->pdev->dev,
1087 "**** write buffer failed, retry skerr\n");
1088 skd_send_internal_skspcl(skdev, skspcl,
1089 TEST_UNIT_READY);
1090 }
1091 break;
1092
1093 case READ_BUFFER:
1094 if (status == SAM_STAT_GOOD) {
1095 if (skd_chk_read_buf(skdev, skspcl) == 0)
1096 skd_send_internal_skspcl(skdev, skspcl,
1097 READ_CAPACITY);
1098 else {
1099 dev_err(&skdev->pdev->dev,
1100 "*** W/R Buffer mismatch %d ***\n",
1101 skdev->connect_retries);
1102 if (skdev->connect_retries <
1103 SKD_MAX_CONNECT_RETRIES) {
1104 skdev->connect_retries++;
1105 skd_soft_reset(skdev);
1106 } else {
1107 dev_err(&skdev->pdev->dev,
1108 "W/R Buffer Connect Error\n");
1109 return;
1110 }
1111 }
1112
1113 } else {
1114 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1115 dev_dbg(&skdev->pdev->dev,
1116 "read buffer failed, don't send anymore state 0x%x\n",
1117 skdev->state);
1118 return;
1119 }
1120 dev_dbg(&skdev->pdev->dev,
1121 "**** read buffer failed, retry skerr\n");
1122 skd_send_internal_skspcl(skdev, skspcl,
1123 TEST_UNIT_READY);
1124 }
1125 break;
1126
1127 case READ_CAPACITY:
1128 skdev->read_cap_is_valid = 0;
1129 if (status == SAM_STAT_GOOD) {
1130 skdev->read_cap_last_lba =
1131 (buf[0] << 24) | (buf[1] << 16) |
1132 (buf[2] << 8) | buf[3];
1133 skdev->read_cap_blocksize =
1134 (buf[4] << 24) | (buf[5] << 16) |
1135 (buf[6] << 8) | buf[7];
1136
1137 dev_dbg(&skdev->pdev->dev, "last lba %d, bs %d\n",
1138 skdev->read_cap_last_lba,
1139 skdev->read_cap_blocksize);
1140
1141 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
1142
1143 skdev->read_cap_is_valid = 1;
1144
1145 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
1146 } else if ((status == SAM_STAT_CHECK_CONDITION) &&
1147 (skerr->key == MEDIUM_ERROR)) {
1148 skdev->read_cap_last_lba = ~0;
1149 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
1150 dev_dbg(&skdev->pdev->dev, "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n");
1151 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
1152 } else {
1153 dev_dbg(&skdev->pdev->dev, "**** READCAP failed, retry TUR\n");
1154 skd_send_internal_skspcl(skdev, skspcl,
1155 TEST_UNIT_READY);
1156 }
1157 break;
1158
1159 case INQUIRY:
1160 skdev->inquiry_is_valid = 0;
1161 if (status == SAM_STAT_GOOD) {
1162 skdev->inquiry_is_valid = 1;
1163
1164 for (i = 0; i < 12; i++)
1165 skdev->inq_serial_num[i] = buf[i + 4];
1166 skdev->inq_serial_num[12] = 0;
1167 }
1168
1169 if (skd_unquiesce_dev(skdev) < 0)
1170 dev_dbg(&skdev->pdev->dev, "**** failed, to ONLINE device\n");
1171 /* connection is complete */
1172 skdev->connect_retries = 0;
1173 break;
1174
1175 case SYNCHRONIZE_CACHE:
1176 if (status == SAM_STAT_GOOD)
1177 skdev->sync_done = 1;
1178 else
1179 skdev->sync_done = -1;
1180 wake_up_interruptible(&skdev->waitq);
1181 break;
1182
1183 default:
1184 SKD_ASSERT("we didn't send this");
1185 }
1186 }
1187
1188 /*
1189 *****************************************************************************
1190 * FIT MESSAGES
1191 *****************************************************************************
1192 */
1193
1194 static void skd_send_fitmsg(struct skd_device *skdev,
1195 struct skd_fitmsg_context *skmsg)
1196 {
1197 u64 qcmd;
1198
1199 dev_dbg(&skdev->pdev->dev, "dma address %pad, busy=%d\n",
1200 &skmsg->mb_dma_address, skd_in_flight(skdev));
1201 dev_dbg(&skdev->pdev->dev, "msg_buf %p\n", skmsg->msg_buf);
1202
1203 qcmd = skmsg->mb_dma_address;
1204 qcmd |= FIT_QCMD_QID_NORMAL;
1205
1206 if (unlikely(skdev->dbg_level > 1)) {
1207 u8 *bp = (u8 *)skmsg->msg_buf;
1208 int i;
1209 for (i = 0; i < skmsg->length; i += 8) {
1210 dev_dbg(&skdev->pdev->dev, "msg[%2d] %8ph\n", i,
1211 &bp[i]);
1212 if (i == 0)
1213 i = 64 - 8;
1214 }
1215 }
1216
1217 if (skmsg->length > 256)
1218 qcmd |= FIT_QCMD_MSGSIZE_512;
1219 else if (skmsg->length > 128)
1220 qcmd |= FIT_QCMD_MSGSIZE_256;
1221 else if (skmsg->length > 64)
1222 qcmd |= FIT_QCMD_MSGSIZE_128;
1223 else
1224 /*
1225 * This makes no sense because the FIT msg header is
1226 * 64 bytes. If the msg is only 64 bytes long it has
1227 * no payload.
1228 */
1229 qcmd |= FIT_QCMD_MSGSIZE_64;
1230
1231 dma_sync_single_for_device(&skdev->pdev->dev, skmsg->mb_dma_address,
1232 skmsg->length, DMA_TO_DEVICE);
1233
1234 /* Make sure skd_msg_buf is written before the doorbell is triggered. */
1235 smp_wmb();
1236
1237 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
1238 }
1239
1240 static void skd_send_special_fitmsg(struct skd_device *skdev,
1241 struct skd_special_context *skspcl)
1242 {
1243 u64 qcmd;
1244
1245 WARN_ON_ONCE(skspcl->req.n_sg != 1);
1246
1247 if (unlikely(skdev->dbg_level > 1)) {
1248 u8 *bp = (u8 *)skspcl->msg_buf;
1249 int i;
1250
1251 for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) {
1252 dev_dbg(&skdev->pdev->dev, " spcl[%2d] %8ph\n", i,
1253 &bp[i]);
1254 if (i == 0)
1255 i = 64 - 8;
1256 }
1257
1258 dev_dbg(&skdev->pdev->dev,
1259 "skspcl=%p id=%04x sksg_list=%p sksg_dma=%pad\n",
1260 skspcl, skspcl->req.id, skspcl->req.sksg_list,
1261 &skspcl->req.sksg_dma_address);
1262 for (i = 0; i < skspcl->req.n_sg; i++) {
1263 struct fit_sg_descriptor *sgd =
1264 &skspcl->req.sksg_list[i];
1265
1266 dev_dbg(&skdev->pdev->dev,
1267 " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
1268 i, sgd->byte_count, sgd->control,
1269 sgd->host_side_addr, sgd->next_desc_ptr);
1270 }
1271 }
1272
1273 /*
1274 * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr
1275 * and one 64-byte SSDI command.
1276 */
1277 qcmd = skspcl->mb_dma_address;
1278 qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
1279
1280 dma_sync_single_for_device(&skdev->pdev->dev, skspcl->mb_dma_address,
1281 SKD_N_SPECIAL_FITMSG_BYTES, DMA_TO_DEVICE);
1282 dma_sync_single_for_device(&skdev->pdev->dev,
1283 skspcl->req.sksg_dma_address,
1284 1 * sizeof(struct fit_sg_descriptor),
1285 DMA_TO_DEVICE);
1286 dma_sync_single_for_device(&skdev->pdev->dev,
1287 skspcl->db_dma_address,
1288 skspcl->req.sksg_list[0].byte_count,
1289 DMA_BIDIRECTIONAL);
1290
1291 /* Make sure skd_msg_buf is written before the doorbell is triggered. */
1292 smp_wmb();
1293
1294 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
1295 }
1296
1297 /*
1298 *****************************************************************************
1299 * COMPLETION QUEUE
1300 *****************************************************************************
1301 */
1302
1303 static void skd_complete_other(struct skd_device *skdev,
1304 struct fit_completion_entry_v1 *skcomp,
1305 struct fit_comp_error_info *skerr);
1306
1307 struct sns_info {
1308 u8 type;
1309 u8 stat;
1310 u8 key;
1311 u8 asc;
1312 u8 ascq;
1313 u8 mask;
1314 enum skd_check_status_action action;
1315 };
1316
1317 static struct sns_info skd_chkstat_table[] = {
1318 /* Good */
1319 { 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c,
1320 SKD_CHECK_STATUS_REPORT_GOOD },
1321
1322 /* Smart alerts */
1323 { 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */
1324 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1325 { 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */
1326 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1327 { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */
1328 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1329
1330 /* Retry (with limits) */
1331 { 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */
1332 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1333 { 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */
1334 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1335 { 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */
1336 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1337 { 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */
1338 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1339
1340 /* Busy (or about to be) */
1341 { 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */
1342 SKD_CHECK_STATUS_BUSY_IMMINENT },
1343 };
1344
1345 /*
1346 * Look up status and sense data to decide how to handle the error
1347 * from the device.
1348 * mask says which fields must match e.g., mask=0x18 means check
1349 * type and stat, ignore key, asc, ascq.
1350 */
1351
1352 static enum skd_check_status_action
1353 skd_check_status(struct skd_device *skdev,
1354 u8 cmp_status, struct fit_comp_error_info *skerr)
1355 {
1356 int i;
1357
1358 dev_err(&skdev->pdev->dev, "key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
1359 skerr->key, skerr->code, skerr->qual, skerr->fruc);
1360
1361 dev_dbg(&skdev->pdev->dev,
1362 "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x fruc=%02x\n",
1363 skerr->type, cmp_status, skerr->key, skerr->code, skerr->qual,
1364 skerr->fruc);
1365
1366 /* Does the info match an entry in the good category? */
1367 for (i = 0; i < ARRAY_SIZE(skd_chkstat_table); i++) {
1368 struct sns_info *sns = &skd_chkstat_table[i];
1369
1370 if (sns->mask & 0x10)
1371 if (skerr->type != sns->type)
1372 continue;
1373
1374 if (sns->mask & 0x08)
1375 if (cmp_status != sns->stat)
1376 continue;
1377
1378 if (sns->mask & 0x04)
1379 if (skerr->key != sns->key)
1380 continue;
1381
1382 if (sns->mask & 0x02)
1383 if (skerr->code != sns->asc)
1384 continue;
1385
1386 if (sns->mask & 0x01)
1387 if (skerr->qual != sns->ascq)
1388 continue;
1389
1390 if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) {
1391 dev_err(&skdev->pdev->dev,
1392 "SMART Alert: sense key/asc/ascq %02x/%02x/%02x\n",
1393 skerr->key, skerr->code, skerr->qual);
1394 }
1395 return sns->action;
1396 }
1397
1398 /* No other match, so nonzero status means error,
1399 * zero status means good
1400 */
1401 if (cmp_status) {
1402 dev_dbg(&skdev->pdev->dev, "status check: error\n");
1403 return SKD_CHECK_STATUS_REPORT_ERROR;
1404 }
1405
1406 dev_dbg(&skdev->pdev->dev, "status check good default\n");
1407 return SKD_CHECK_STATUS_REPORT_GOOD;
1408 }
1409
1410 static void skd_resolve_req_exception(struct skd_device *skdev,
1411 struct skd_request_context *skreq,
1412 struct request *req)
1413 {
1414 u8 cmp_status = skreq->completion.status;
1415
1416 switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) {
1417 case SKD_CHECK_STATUS_REPORT_GOOD:
1418 case SKD_CHECK_STATUS_REPORT_SMART_ALERT:
1419 skreq->status = BLK_STS_OK;
1420 if (likely(!blk_should_fake_timeout(req->q)))
1421 blk_mq_complete_request(req);
1422 break;
1423
1424 case SKD_CHECK_STATUS_BUSY_IMMINENT:
1425 skd_log_skreq(skdev, skreq, "retry(busy)");
1426 blk_mq_requeue_request(req, true);
1427 dev_info(&skdev->pdev->dev, "drive BUSY imminent\n");
1428 skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT;
1429 skdev->timer_countdown = SKD_TIMER_MINUTES(20);
1430 skd_quiesce_dev(skdev);
1431 break;
1432
1433 case SKD_CHECK_STATUS_REQUEUE_REQUEST:
1434 if (++skreq->retries < SKD_MAX_RETRIES) {
1435 skd_log_skreq(skdev, skreq, "retry");
1436 blk_mq_requeue_request(req, true);
1437 break;
1438 }
1439 fallthrough;
1440
1441 case SKD_CHECK_STATUS_REPORT_ERROR:
1442 default:
1443 skreq->status = BLK_STS_IOERR;
1444 if (likely(!blk_should_fake_timeout(req->q)))
1445 blk_mq_complete_request(req);
1446 break;
1447 }
1448 }
1449
1450 static void skd_release_skreq(struct skd_device *skdev,
1451 struct skd_request_context *skreq)
1452 {
1453 /*
1454 * Reclaim the skd_request_context
1455 */
1456 skreq->state = SKD_REQ_STATE_IDLE;
1457 }
1458
1459 static int skd_isr_completion_posted(struct skd_device *skdev,
1460 int limit, int *enqueued)
1461 {
1462 struct fit_completion_entry_v1 *skcmp;
1463 struct fit_comp_error_info *skerr;
1464 u16 req_id;
1465 u32 tag;
1466 u16 hwq = 0;
1467 struct request *rq;
1468 struct skd_request_context *skreq;
1469 u16 cmp_cntxt;
1470 u8 cmp_status;
1471 u8 cmp_cycle;
1472 u32 cmp_bytes;
1473 int rc = 0;
1474 int processed = 0;
1475
1476 lockdep_assert_held(&skdev->lock);
1477
1478 for (;; ) {
1479 SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY);
1480
1481 skcmp = &skdev->skcomp_table[skdev->skcomp_ix];
1482 cmp_cycle = skcmp->cycle;
1483 cmp_cntxt = skcmp->tag;
1484 cmp_status = skcmp->status;
1485 cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes);
1486
1487 skerr = &skdev->skerr_table[skdev->skcomp_ix];
1488
1489 dev_dbg(&skdev->pdev->dev,
1490 "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d busy=%d rbytes=0x%x proto=%d\n",
1491 skdev->skcomp_cycle, skdev->skcomp_ix, cmp_cycle,
1492 cmp_cntxt, cmp_status, skd_in_flight(skdev),
1493 cmp_bytes, skdev->proto_ver);
1494
1495 if (cmp_cycle != skdev->skcomp_cycle) {
1496 dev_dbg(&skdev->pdev->dev, "end of completions\n");
1497 break;
1498 }
1499 /*
1500 * Update the completion queue head index and possibly
1501 * the completion cycle count. 8-bit wrap-around.
1502 */
1503 skdev->skcomp_ix++;
1504 if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) {
1505 skdev->skcomp_ix = 0;
1506 skdev->skcomp_cycle++;
1507 }
1508
1509 /*
1510 * The command context is a unique 32-bit ID. The low order
1511 * bits help locate the request. The request is usually a
1512 * r/w request (see skd_start() above) or a special request.
1513 */
1514 req_id = cmp_cntxt;
1515 tag = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
1516
1517 /* Is this other than a r/w request? */
1518 if (tag >= skdev->num_req_context) {
1519 /*
1520 * This is not a completion for a r/w request.
1521 */
1522 WARN_ON_ONCE(blk_mq_tag_to_rq(skdev->tag_set.tags[hwq],
1523 tag));
1524 skd_complete_other(skdev, skcmp, skerr);
1525 continue;
1526 }
1527
1528 rq = blk_mq_tag_to_rq(skdev->tag_set.tags[hwq], tag);
1529 if (WARN(!rq, "No request for tag %#x -> %#x\n", cmp_cntxt,
1530 tag))
1531 continue;
1532 skreq = blk_mq_rq_to_pdu(rq);
1533
1534 /*
1535 * Make sure the request ID for the slot matches.
1536 */
1537 if (skreq->id != req_id) {
1538 dev_err(&skdev->pdev->dev,
1539 "Completion mismatch comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
1540 req_id, skreq->id, cmp_cntxt);
1541
1542 continue;
1543 }
1544
1545 SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
1546
1547 skreq->completion = *skcmp;
1548 if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) {
1549 skreq->err_info = *skerr;
1550 skd_log_check_status(skdev, cmp_status, skerr->key,
1551 skerr->code, skerr->qual,
1552 skerr->fruc);
1553 }
1554 /* Release DMA resources for the request. */
1555 if (skreq->n_sg > 0)
1556 skd_postop_sg_list(skdev, skreq);
1557
1558 skd_release_skreq(skdev, skreq);
1559
1560 /*
1561 * Capture the outcome and post it back to the native request.
1562 */
1563 if (likely(cmp_status == SAM_STAT_GOOD)) {
1564 skreq->status = BLK_STS_OK;
1565 if (likely(!blk_should_fake_timeout(rq->q)))
1566 blk_mq_complete_request(rq);
1567 } else {
1568 skd_resolve_req_exception(skdev, skreq, rq);
1569 }
1570
1571 /* skd_isr_comp_limit equal zero means no limit */
1572 if (limit) {
1573 if (++processed >= limit) {
1574 rc = 1;
1575 break;
1576 }
1577 }
1578 }
1579
1580 if (skdev->state == SKD_DRVR_STATE_PAUSING &&
1581 skd_in_flight(skdev) == 0) {
1582 skdev->state = SKD_DRVR_STATE_PAUSED;
1583 wake_up_interruptible(&skdev->waitq);
1584 }
1585
1586 return rc;
1587 }
1588
1589 static void skd_complete_other(struct skd_device *skdev,
1590 struct fit_completion_entry_v1 *skcomp,
1591 struct fit_comp_error_info *skerr)
1592 {
1593 u32 req_id = 0;
1594 u32 req_table;
1595 u32 req_slot;
1596 struct skd_special_context *skspcl;
1597
1598 lockdep_assert_held(&skdev->lock);
1599
1600 req_id = skcomp->tag;
1601 req_table = req_id & SKD_ID_TABLE_MASK;
1602 req_slot = req_id & SKD_ID_SLOT_MASK;
1603
1604 dev_dbg(&skdev->pdev->dev, "table=0x%x id=0x%x slot=%d\n", req_table,
1605 req_id, req_slot);
1606
1607 /*
1608 * Based on the request id, determine how to dispatch this completion.
1609 * This swich/case is finding the good cases and forwarding the
1610 * completion entry. Errors are reported below the switch.
1611 */
1612 switch (req_table) {
1613 case SKD_ID_RW_REQUEST:
1614 /*
1615 * The caller, skd_isr_completion_posted() above,
1616 * handles r/w requests. The only way we get here
1617 * is if the req_slot is out of bounds.
1618 */
1619 break;
1620
1621 case SKD_ID_INTERNAL:
1622 if (req_slot == 0) {
1623 skspcl = &skdev->internal_skspcl;
1624 if (skspcl->req.id == req_id &&
1625 skspcl->req.state == SKD_REQ_STATE_BUSY) {
1626 skd_complete_internal(skdev,
1627 skcomp, skerr, skspcl);
1628 return;
1629 }
1630 }
1631 break;
1632
1633 case SKD_ID_FIT_MSG:
1634 /*
1635 * These id's should never appear in a completion record.
1636 */
1637 break;
1638
1639 default:
1640 /*
1641 * These id's should never appear anywhere;
1642 */
1643 break;
1644 }
1645
1646 /*
1647 * If we get here it is a bad or stale id.
1648 */
1649 }
1650
1651 static void skd_reset_skcomp(struct skd_device *skdev)
1652 {
1653 memset(skdev->skcomp_table, 0, SKD_SKCOMP_SIZE);
1654
1655 skdev->skcomp_ix = 0;
1656 skdev->skcomp_cycle = 1;
1657 }
1658
1659 /*
1660 *****************************************************************************
1661 * INTERRUPTS
1662 *****************************************************************************
1663 */
1664 static void skd_completion_worker(struct work_struct *work)
1665 {
1666 struct skd_device *skdev =
1667 container_of(work, struct skd_device, completion_worker);
1668 unsigned long flags;
1669 int flush_enqueued = 0;
1670
1671 spin_lock_irqsave(&skdev->lock, flags);
1672
1673 /*
1674 * pass in limit=0, which means no limit..
1675 * process everything in compq
1676 */
1677 skd_isr_completion_posted(skdev, 0, &flush_enqueued);
1678 schedule_work(&skdev->start_queue);
1679
1680 spin_unlock_irqrestore(&skdev->lock, flags);
1681 }
1682
1683 static void skd_isr_msg_from_dev(struct skd_device *skdev);
1684
1685 static irqreturn_t
1686 skd_isr(int irq, void *ptr)
1687 {
1688 struct skd_device *skdev = ptr;
1689 u32 intstat;
1690 u32 ack;
1691 int rc = 0;
1692 int deferred = 0;
1693 int flush_enqueued = 0;
1694
1695 spin_lock(&skdev->lock);
1696
1697 for (;; ) {
1698 intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
1699
1700 ack = FIT_INT_DEF_MASK;
1701 ack &= intstat;
1702
1703 dev_dbg(&skdev->pdev->dev, "intstat=0x%x ack=0x%x\n", intstat,
1704 ack);
1705
1706 /* As long as there is an int pending on device, keep
1707 * running loop. When none, get out, but if we've never
1708 * done any processing, call completion handler?
1709 */
1710 if (ack == 0) {
1711 /* No interrupts on device, but run the completion
1712 * processor anyway?
1713 */
1714 if (rc == 0)
1715 if (likely (skdev->state
1716 == SKD_DRVR_STATE_ONLINE))
1717 deferred = 1;
1718 break;
1719 }
1720
1721 rc = IRQ_HANDLED;
1722
1723 SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST);
1724
1725 if (likely((skdev->state != SKD_DRVR_STATE_LOAD) &&
1726 (skdev->state != SKD_DRVR_STATE_STOPPING))) {
1727 if (intstat & FIT_ISH_COMPLETION_POSTED) {
1728 /*
1729 * If we have already deferred completion
1730 * processing, don't bother running it again
1731 */
1732 if (deferred == 0)
1733 deferred =
1734 skd_isr_completion_posted(skdev,
1735 skd_isr_comp_limit, &flush_enqueued);
1736 }
1737
1738 if (intstat & FIT_ISH_FW_STATE_CHANGE) {
1739 skd_isr_fwstate(skdev);
1740 if (skdev->state == SKD_DRVR_STATE_FAULT ||
1741 skdev->state ==
1742 SKD_DRVR_STATE_DISAPPEARED) {
1743 spin_unlock(&skdev->lock);
1744 return rc;
1745 }
1746 }
1747
1748 if (intstat & FIT_ISH_MSG_FROM_DEV)
1749 skd_isr_msg_from_dev(skdev);
1750 }
1751 }
1752
1753 if (unlikely(flush_enqueued))
1754 schedule_work(&skdev->start_queue);
1755
1756 if (deferred)
1757 schedule_work(&skdev->completion_worker);
1758 else if (!flush_enqueued)
1759 schedule_work(&skdev->start_queue);
1760
1761 spin_unlock(&skdev->lock);
1762
1763 return rc;
1764 }
1765
1766 static void skd_drive_fault(struct skd_device *skdev)
1767 {
1768 skdev->state = SKD_DRVR_STATE_FAULT;
1769 dev_err(&skdev->pdev->dev, "Drive FAULT\n");
1770 }
1771
1772 static void skd_drive_disappeared(struct skd_device *skdev)
1773 {
1774 skdev->state = SKD_DRVR_STATE_DISAPPEARED;
1775 dev_err(&skdev->pdev->dev, "Drive DISAPPEARED\n");
1776 }
1777
1778 static void skd_isr_fwstate(struct skd_device *skdev)
1779 {
1780 u32 sense;
1781 u32 state;
1782 u32 mtd;
1783 int prev_driver_state = skdev->state;
1784
1785 sense = SKD_READL(skdev, FIT_STATUS);
1786 state = sense & FIT_SR_DRIVE_STATE_MASK;
1787
1788 dev_err(&skdev->pdev->dev, "s1120 state %s(%d)=>%s(%d)\n",
1789 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
1790 skd_drive_state_to_str(state), state);
1791
1792 skdev->drive_state = state;
1793
1794 switch (skdev->drive_state) {
1795 case FIT_SR_DRIVE_INIT:
1796 if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) {
1797 skd_disable_interrupts(skdev);
1798 break;
1799 }
1800 if (skdev->state == SKD_DRVR_STATE_RESTARTING)
1801 skd_recover_requests(skdev);
1802 if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) {
1803 skdev->timer_countdown = SKD_STARTING_TIMO;
1804 skdev->state = SKD_DRVR_STATE_STARTING;
1805 skd_soft_reset(skdev);
1806 break;
1807 }
1808 mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0);
1809 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1810 skdev->last_mtd = mtd;
1811 break;
1812
1813 case FIT_SR_DRIVE_ONLINE:
1814 skdev->cur_max_queue_depth = skd_max_queue_depth;
1815 if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth)
1816 skdev->cur_max_queue_depth = skdev->dev_max_queue_depth;
1817
1818 skdev->queue_low_water_mark =
1819 skdev->cur_max_queue_depth * 2 / 3 + 1;
1820 if (skdev->queue_low_water_mark < 1)
1821 skdev->queue_low_water_mark = 1;
1822 dev_info(&skdev->pdev->dev,
1823 "Queue depth limit=%d dev=%d lowat=%d\n",
1824 skdev->cur_max_queue_depth,
1825 skdev->dev_max_queue_depth,
1826 skdev->queue_low_water_mark);
1827
1828 skd_refresh_device_data(skdev);
1829 break;
1830
1831 case FIT_SR_DRIVE_BUSY:
1832 skdev->state = SKD_DRVR_STATE_BUSY;
1833 skdev->timer_countdown = SKD_BUSY_TIMO;
1834 skd_quiesce_dev(skdev);
1835 break;
1836 case FIT_SR_DRIVE_BUSY_SANITIZE:
1837 /* set timer for 3 seconds, we'll abort any unfinished
1838 * commands after that expires
1839 */
1840 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
1841 skdev->timer_countdown = SKD_TIMER_SECONDS(3);
1842 schedule_work(&skdev->start_queue);
1843 break;
1844 case FIT_SR_DRIVE_BUSY_ERASE:
1845 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
1846 skdev->timer_countdown = SKD_BUSY_TIMO;
1847 break;
1848 case FIT_SR_DRIVE_OFFLINE:
1849 skdev->state = SKD_DRVR_STATE_IDLE;
1850 break;
1851 case FIT_SR_DRIVE_SOFT_RESET:
1852 switch (skdev->state) {
1853 case SKD_DRVR_STATE_STARTING:
1854 case SKD_DRVR_STATE_RESTARTING:
1855 /* Expected by a caller of skd_soft_reset() */
1856 break;
1857 default:
1858 skdev->state = SKD_DRVR_STATE_RESTARTING;
1859 break;
1860 }
1861 break;
1862 case FIT_SR_DRIVE_FW_BOOTING:
1863 dev_dbg(&skdev->pdev->dev, "ISR FIT_SR_DRIVE_FW_BOOTING\n");
1864 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
1865 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
1866 break;
1867
1868 case FIT_SR_DRIVE_DEGRADED:
1869 case FIT_SR_PCIE_LINK_DOWN:
1870 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
1871 break;
1872
1873 case FIT_SR_DRIVE_FAULT:
1874 skd_drive_fault(skdev);
1875 skd_recover_requests(skdev);
1876 schedule_work(&skdev->start_queue);
1877 break;
1878
1879 /* PCIe bus returned all Fs? */
1880 case 0xFF:
1881 dev_info(&skdev->pdev->dev, "state=0x%x sense=0x%x\n", state,
1882 sense);
1883 skd_drive_disappeared(skdev);
1884 skd_recover_requests(skdev);
1885 schedule_work(&skdev->start_queue);
1886 break;
1887 default:
1888 /*
1889 * Uknown FW State. Wait for a state we recognize.
1890 */
1891 break;
1892 }
1893 dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
1894 skd_skdev_state_to_str(prev_driver_state), prev_driver_state,
1895 skd_skdev_state_to_str(skdev->state), skdev->state);
1896 }
1897
1898 static bool skd_recover_request(struct request *req, void *data, bool reserved)
1899 {
1900 struct skd_device *const skdev = data;
1901 struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
1902
1903 if (skreq->state != SKD_REQ_STATE_BUSY)
1904 return true;
1905
1906 skd_log_skreq(skdev, skreq, "recover");
1907
1908 /* Release DMA resources for the request. */
1909 if (skreq->n_sg > 0)
1910 skd_postop_sg_list(skdev, skreq);
1911
1912 skreq->state = SKD_REQ_STATE_IDLE;
1913 skreq->status = BLK_STS_IOERR;
1914 blk_mq_complete_request(req);
1915 return true;
1916 }
1917
1918 static void skd_recover_requests(struct skd_device *skdev)
1919 {
1920 blk_mq_tagset_busy_iter(&skdev->tag_set, skd_recover_request, skdev);
1921 }
1922
1923 static void skd_isr_msg_from_dev(struct skd_device *skdev)
1924 {
1925 u32 mfd;
1926 u32 mtd;
1927 u32 data;
1928
1929 mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
1930
1931 dev_dbg(&skdev->pdev->dev, "mfd=0x%x last_mtd=0x%x\n", mfd,
1932 skdev->last_mtd);
1933
1934 /* ignore any mtd that is an ack for something we didn't send */
1935 if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd))
1936 return;
1937
1938 switch (FIT_MXD_TYPE(mfd)) {
1939 case FIT_MTD_FITFW_INIT:
1940 skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd);
1941
1942 if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) {
1943 dev_err(&skdev->pdev->dev, "protocol mismatch\n");
1944 dev_err(&skdev->pdev->dev, " got=%d support=%d\n",
1945 skdev->proto_ver, FIT_PROTOCOL_VERSION_1);
1946 dev_err(&skdev->pdev->dev, " please upgrade driver\n");
1947 skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH;
1948 skd_soft_reset(skdev);
1949 break;
1950 }
1951 mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0);
1952 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1953 skdev->last_mtd = mtd;
1954 break;
1955
1956 case FIT_MTD_GET_CMDQ_DEPTH:
1957 skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd);
1958 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0,
1959 SKD_N_COMPLETION_ENTRY);
1960 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1961 skdev->last_mtd = mtd;
1962 break;
1963
1964 case FIT_MTD_SET_COMPQ_DEPTH:
1965 SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG);
1966 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0);
1967 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1968 skdev->last_mtd = mtd;
1969 break;
1970
1971 case FIT_MTD_SET_COMPQ_ADDR:
1972 skd_reset_skcomp(skdev);
1973 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno);
1974 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1975 skdev->last_mtd = mtd;
1976 break;
1977
1978 case FIT_MTD_CMD_LOG_HOST_ID:
1979 /* hardware interface overflows in y2106 */
1980 skdev->connect_time_stamp = (u32)ktime_get_real_seconds();
1981 data = skdev->connect_time_stamp & 0xFFFF;
1982 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data);
1983 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1984 skdev->last_mtd = mtd;
1985 break;
1986
1987 case FIT_MTD_CMD_LOG_TIME_STAMP_LO:
1988 skdev->drive_jiffies = FIT_MXD_DATA(mfd);
1989 data = (skdev->connect_time_stamp >> 16) & 0xFFFF;
1990 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data);
1991 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1992 skdev->last_mtd = mtd;
1993 break;
1994
1995 case FIT_MTD_CMD_LOG_TIME_STAMP_HI:
1996 skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16);
1997 mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0);
1998 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1999 skdev->last_mtd = mtd;
2000
2001 dev_err(&skdev->pdev->dev, "Time sync driver=0x%x device=0x%x\n",
2002 skdev->connect_time_stamp, skdev->drive_jiffies);
2003 break;
2004
2005 case FIT_MTD_ARM_QUEUE:
2006 skdev->last_mtd = 0;
2007 /*
2008 * State should be, or soon will be, FIT_SR_DRIVE_ONLINE.
2009 */
2010 break;
2011
2012 default:
2013 break;
2014 }
2015 }
2016
2017 static void skd_disable_interrupts(struct skd_device *skdev)
2018 {
2019 u32 sense;
2020
2021 sense = SKD_READL(skdev, FIT_CONTROL);
2022 sense &= ~FIT_CR_ENABLE_INTERRUPTS;
2023 SKD_WRITEL(skdev, sense, FIT_CONTROL);
2024 dev_dbg(&skdev->pdev->dev, "sense 0x%x\n", sense);
2025
2026 /* Note that the 1s is written. A 1-bit means
2027 * disable, a 0 means enable.
2028 */
2029 SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST);
2030 }
2031
2032 static void skd_enable_interrupts(struct skd_device *skdev)
2033 {
2034 u32 val;
2035
2036 /* unmask interrupts first */
2037 val = FIT_ISH_FW_STATE_CHANGE +
2038 FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV;
2039
2040 /* Note that the compliment of mask is written. A 1-bit means
2041 * disable, a 0 means enable. */
2042 SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST);
2043 dev_dbg(&skdev->pdev->dev, "interrupt mask=0x%x\n", ~val);
2044
2045 val = SKD_READL(skdev, FIT_CONTROL);
2046 val |= FIT_CR_ENABLE_INTERRUPTS;
2047 dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
2048 SKD_WRITEL(skdev, val, FIT_CONTROL);
2049 }
2050
2051 /*
2052 *****************************************************************************
2053 * START, STOP, RESTART, QUIESCE, UNQUIESCE
2054 *****************************************************************************
2055 */
2056
2057 static void skd_soft_reset(struct skd_device *skdev)
2058 {
2059 u32 val;
2060
2061 val = SKD_READL(skdev, FIT_CONTROL);
2062 val |= (FIT_CR_SOFT_RESET);
2063 dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
2064 SKD_WRITEL(skdev, val, FIT_CONTROL);
2065 }
2066
2067 static void skd_start_device(struct skd_device *skdev)
2068 {
2069 unsigned long flags;
2070 u32 sense;
2071 u32 state;
2072
2073 spin_lock_irqsave(&skdev->lock, flags);
2074
2075 /* ack all ghost interrupts */
2076 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2077
2078 sense = SKD_READL(skdev, FIT_STATUS);
2079
2080 dev_dbg(&skdev->pdev->dev, "initial status=0x%x\n", sense);
2081
2082 state = sense & FIT_SR_DRIVE_STATE_MASK;
2083 skdev->drive_state = state;
2084 skdev->last_mtd = 0;
2085
2086 skdev->state = SKD_DRVR_STATE_STARTING;
2087 skdev->timer_countdown = SKD_STARTING_TIMO;
2088
2089 skd_enable_interrupts(skdev);
2090
2091 switch (skdev->drive_state) {
2092 case FIT_SR_DRIVE_OFFLINE:
2093 dev_err(&skdev->pdev->dev, "Drive offline...\n");
2094 break;
2095
2096 case FIT_SR_DRIVE_FW_BOOTING:
2097 dev_dbg(&skdev->pdev->dev, "FIT_SR_DRIVE_FW_BOOTING\n");
2098 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
2099 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
2100 break;
2101
2102 case FIT_SR_DRIVE_BUSY_SANITIZE:
2103 dev_info(&skdev->pdev->dev, "Start: BUSY_SANITIZE\n");
2104 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
2105 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2106 break;
2107
2108 case FIT_SR_DRIVE_BUSY_ERASE:
2109 dev_info(&skdev->pdev->dev, "Start: BUSY_ERASE\n");
2110 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
2111 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2112 break;
2113
2114 case FIT_SR_DRIVE_INIT:
2115 case FIT_SR_DRIVE_ONLINE:
2116 skd_soft_reset(skdev);
2117 break;
2118
2119 case FIT_SR_DRIVE_BUSY:
2120 dev_err(&skdev->pdev->dev, "Drive Busy...\n");
2121 skdev->state = SKD_DRVR_STATE_BUSY;
2122 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2123 break;
2124
2125 case FIT_SR_DRIVE_SOFT_RESET:
2126 dev_err(&skdev->pdev->dev, "drive soft reset in prog\n");
2127 break;
2128
2129 case FIT_SR_DRIVE_FAULT:
2130 /* Fault state is bad...soft reset won't do it...
2131 * Hard reset, maybe, but does it work on device?
2132 * For now, just fault so the system doesn't hang.
2133 */
2134 skd_drive_fault(skdev);
2135 /*start the queue so we can respond with error to requests */
2136 dev_dbg(&skdev->pdev->dev, "starting queue\n");
2137 schedule_work(&skdev->start_queue);
2138 skdev->gendisk_on = -1;
2139 wake_up_interruptible(&skdev->waitq);
2140 break;
2141
2142 case 0xFF:
2143 /* Most likely the device isn't there or isn't responding
2144 * to the BAR1 addresses. */
2145 skd_drive_disappeared(skdev);
2146 /*start the queue so we can respond with error to requests */
2147 dev_dbg(&skdev->pdev->dev,
2148 "starting queue to error-out reqs\n");
2149 schedule_work(&skdev->start_queue);
2150 skdev->gendisk_on = -1;
2151 wake_up_interruptible(&skdev->waitq);
2152 break;
2153
2154 default:
2155 dev_err(&skdev->pdev->dev, "Start: unknown state %x\n",
2156 skdev->drive_state);
2157 break;
2158 }
2159
2160 state = SKD_READL(skdev, FIT_CONTROL);
2161 dev_dbg(&skdev->pdev->dev, "FIT Control Status=0x%x\n", state);
2162
2163 state = SKD_READL(skdev, FIT_INT_STATUS_HOST);
2164 dev_dbg(&skdev->pdev->dev, "Intr Status=0x%x\n", state);
2165
2166 state = SKD_READL(skdev, FIT_INT_MASK_HOST);
2167 dev_dbg(&skdev->pdev->dev, "Intr Mask=0x%x\n", state);
2168
2169 state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
2170 dev_dbg(&skdev->pdev->dev, "Msg from Dev=0x%x\n", state);
2171
2172 state = SKD_READL(skdev, FIT_HW_VERSION);
2173 dev_dbg(&skdev->pdev->dev, "HW version=0x%x\n", state);
2174
2175 spin_unlock_irqrestore(&skdev->lock, flags);
2176 }
2177
2178 static void skd_stop_device(struct skd_device *skdev)
2179 {
2180 unsigned long flags;
2181 struct skd_special_context *skspcl = &skdev->internal_skspcl;
2182 u32 dev_state;
2183 int i;
2184
2185 spin_lock_irqsave(&skdev->lock, flags);
2186
2187 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
2188 dev_err(&skdev->pdev->dev, "%s not online no sync\n", __func__);
2189 goto stop_out;
2190 }
2191
2192 if (skspcl->req.state != SKD_REQ_STATE_IDLE) {
2193 dev_err(&skdev->pdev->dev, "%s no special\n", __func__);
2194 goto stop_out;
2195 }
2196
2197 skdev->state = SKD_DRVR_STATE_SYNCING;
2198 skdev->sync_done = 0;
2199
2200 skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE);
2201
2202 spin_unlock_irqrestore(&skdev->lock, flags);
2203
2204 wait_event_interruptible_timeout(skdev->waitq,
2205 (skdev->sync_done), (10 * HZ));
2206
2207 spin_lock_irqsave(&skdev->lock, flags);
2208
2209 switch (skdev->sync_done) {
2210 case 0:
2211 dev_err(&skdev->pdev->dev, "%s no sync\n", __func__);
2212 break;
2213 case 1:
2214 dev_err(&skdev->pdev->dev, "%s sync done\n", __func__);
2215 break;
2216 default:
2217 dev_err(&skdev->pdev->dev, "%s sync error\n", __func__);
2218 }
2219
2220 stop_out:
2221 skdev->state = SKD_DRVR_STATE_STOPPING;
2222 spin_unlock_irqrestore(&skdev->lock, flags);
2223
2224 skd_kill_timer(skdev);
2225
2226 spin_lock_irqsave(&skdev->lock, flags);
2227 skd_disable_interrupts(skdev);
2228
2229 /* ensure all ints on device are cleared */
2230 /* soft reset the device to unload with a clean slate */
2231 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2232 SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL);
2233
2234 spin_unlock_irqrestore(&skdev->lock, flags);
2235
2236 /* poll every 100ms, 1 second timeout */
2237 for (i = 0; i < 10; i++) {
2238 dev_state =
2239 SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK;
2240 if (dev_state == FIT_SR_DRIVE_INIT)
2241 break;
2242 set_current_state(TASK_INTERRUPTIBLE);
2243 schedule_timeout(msecs_to_jiffies(100));
2244 }
2245
2246 if (dev_state != FIT_SR_DRIVE_INIT)
2247 dev_err(&skdev->pdev->dev, "%s state error 0x%02x\n", __func__,
2248 dev_state);
2249 }
2250
2251 /* assume spinlock is held */
2252 static void skd_restart_device(struct skd_device *skdev)
2253 {
2254 u32 state;
2255
2256 /* ack all ghost interrupts */
2257 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2258
2259 state = SKD_READL(skdev, FIT_STATUS);
2260
2261 dev_dbg(&skdev->pdev->dev, "drive status=0x%x\n", state);
2262
2263 state &= FIT_SR_DRIVE_STATE_MASK;
2264 skdev->drive_state = state;
2265 skdev->last_mtd = 0;
2266
2267 skdev->state = SKD_DRVR_STATE_RESTARTING;
2268 skdev->timer_countdown = SKD_RESTARTING_TIMO;
2269
2270 skd_soft_reset(skdev);
2271 }
2272
2273 /* assume spinlock is held */
2274 static int skd_quiesce_dev(struct skd_device *skdev)
2275 {
2276 int rc = 0;
2277
2278 switch (skdev->state) {
2279 case SKD_DRVR_STATE_BUSY:
2280 case SKD_DRVR_STATE_BUSY_IMMINENT:
2281 dev_dbg(&skdev->pdev->dev, "stopping queue\n");
2282 blk_mq_stop_hw_queues(skdev->queue);
2283 break;
2284 case SKD_DRVR_STATE_ONLINE:
2285 case SKD_DRVR_STATE_STOPPING:
2286 case SKD_DRVR_STATE_SYNCING:
2287 case SKD_DRVR_STATE_PAUSING:
2288 case SKD_DRVR_STATE_PAUSED:
2289 case SKD_DRVR_STATE_STARTING:
2290 case SKD_DRVR_STATE_RESTARTING:
2291 case SKD_DRVR_STATE_RESUMING:
2292 default:
2293 rc = -EINVAL;
2294 dev_dbg(&skdev->pdev->dev, "state [%d] not implemented\n",
2295 skdev->state);
2296 }
2297 return rc;
2298 }
2299
2300 /* assume spinlock is held */
2301 static int skd_unquiesce_dev(struct skd_device *skdev)
2302 {
2303 int prev_driver_state = skdev->state;
2304
2305 skd_log_skdev(skdev, "unquiesce");
2306 if (skdev->state == SKD_DRVR_STATE_ONLINE) {
2307 dev_dbg(&skdev->pdev->dev, "**** device already ONLINE\n");
2308 return 0;
2309 }
2310 if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) {
2311 /*
2312 * If there has been an state change to other than
2313 * ONLINE, we will rely on controller state change
2314 * to come back online and restart the queue.
2315 * The BUSY state means that driver is ready to
2316 * continue normal processing but waiting for controller
2317 * to become available.
2318 */
2319 skdev->state = SKD_DRVR_STATE_BUSY;
2320 dev_dbg(&skdev->pdev->dev, "drive BUSY state\n");
2321 return 0;
2322 }
2323
2324 /*
2325 * Drive has just come online, driver is either in startup,
2326 * paused performing a task, or bust waiting for hardware.
2327 */
2328 switch (skdev->state) {
2329 case SKD_DRVR_STATE_PAUSED:
2330 case SKD_DRVR_STATE_BUSY:
2331 case SKD_DRVR_STATE_BUSY_IMMINENT:
2332 case SKD_DRVR_STATE_BUSY_ERASE:
2333 case SKD_DRVR_STATE_STARTING:
2334 case SKD_DRVR_STATE_RESTARTING:
2335 case SKD_DRVR_STATE_FAULT:
2336 case SKD_DRVR_STATE_IDLE:
2337 case SKD_DRVR_STATE_LOAD:
2338 skdev->state = SKD_DRVR_STATE_ONLINE;
2339 dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
2340 skd_skdev_state_to_str(prev_driver_state),
2341 prev_driver_state, skd_skdev_state_to_str(skdev->state),
2342 skdev->state);
2343 dev_dbg(&skdev->pdev->dev,
2344 "**** device ONLINE...starting block queue\n");
2345 dev_dbg(&skdev->pdev->dev, "starting queue\n");
2346 dev_info(&skdev->pdev->dev, "STEC s1120 ONLINE\n");
2347 schedule_work(&skdev->start_queue);
2348 skdev->gendisk_on = 1;
2349 wake_up_interruptible(&skdev->waitq);
2350 break;
2351
2352 case SKD_DRVR_STATE_DISAPPEARED:
2353 default:
2354 dev_dbg(&skdev->pdev->dev,
2355 "**** driver state %d, not implemented\n",
2356 skdev->state);
2357 return -EBUSY;
2358 }
2359 return 0;
2360 }
2361
2362 /*
2363 *****************************************************************************
2364 * PCIe MSI/MSI-X INTERRUPT HANDLERS
2365 *****************************************************************************
2366 */
2367
2368 static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data)
2369 {
2370 struct skd_device *skdev = skd_host_data;
2371 unsigned long flags;
2372
2373 spin_lock_irqsave(&skdev->lock, flags);
2374 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2375 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2376 dev_err(&skdev->pdev->dev, "MSIX reserved irq %d = 0x%x\n", irq,
2377 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2378 SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST);
2379 spin_unlock_irqrestore(&skdev->lock, flags);
2380 return IRQ_HANDLED;
2381 }
2382
2383 static irqreturn_t skd_statec_isr(int irq, void *skd_host_data)
2384 {
2385 struct skd_device *skdev = skd_host_data;
2386 unsigned long flags;
2387
2388 spin_lock_irqsave(&skdev->lock, flags);
2389 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2390 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2391 SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST);
2392 skd_isr_fwstate(skdev);
2393 spin_unlock_irqrestore(&skdev->lock, flags);
2394 return IRQ_HANDLED;
2395 }
2396
2397 static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
2398 {
2399 struct skd_device *skdev = skd_host_data;
2400 unsigned long flags;
2401 int flush_enqueued = 0;
2402 int deferred;
2403
2404 spin_lock_irqsave(&skdev->lock, flags);
2405 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2406 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2407 SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST);
2408 deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
2409 &flush_enqueued);
2410 if (flush_enqueued)
2411 schedule_work(&skdev->start_queue);
2412
2413 if (deferred)
2414 schedule_work(&skdev->completion_worker);
2415 else if (!flush_enqueued)
2416 schedule_work(&skdev->start_queue);
2417
2418 spin_unlock_irqrestore(&skdev->lock, flags);
2419
2420 return IRQ_HANDLED;
2421 }
2422
2423 static irqreturn_t skd_msg_isr(int irq, void *skd_host_data)
2424 {
2425 struct skd_device *skdev = skd_host_data;
2426 unsigned long flags;
2427
2428 spin_lock_irqsave(&skdev->lock, flags);
2429 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2430 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2431 SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST);
2432 skd_isr_msg_from_dev(skdev);
2433 spin_unlock_irqrestore(&skdev->lock, flags);
2434 return IRQ_HANDLED;
2435 }
2436
2437 static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data)
2438 {
2439 struct skd_device *skdev = skd_host_data;
2440 unsigned long flags;
2441
2442 spin_lock_irqsave(&skdev->lock, flags);
2443 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2444 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2445 SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST);
2446 spin_unlock_irqrestore(&skdev->lock, flags);
2447 return IRQ_HANDLED;
2448 }
2449
2450 /*
2451 *****************************************************************************
2452 * PCIe MSI/MSI-X SETUP
2453 *****************************************************************************
2454 */
2455
2456 struct skd_msix_entry {
2457 char isr_name[30];
2458 };
2459
2460 struct skd_init_msix_entry {
2461 const char *name;
2462 irq_handler_t handler;
2463 };
2464
2465 #define SKD_MAX_MSIX_COUNT 13
2466 #define SKD_MIN_MSIX_COUNT 7
2467 #define SKD_BASE_MSIX_IRQ 4
2468
2469 static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = {
2470 { "(DMA 0)", skd_reserved_isr },
2471 { "(DMA 1)", skd_reserved_isr },
2472 { "(DMA 2)", skd_reserved_isr },
2473 { "(DMA 3)", skd_reserved_isr },
2474 { "(State Change)", skd_statec_isr },
2475 { "(COMPL_Q)", skd_comp_q },
2476 { "(MSG)", skd_msg_isr },
2477 { "(Reserved)", skd_reserved_isr },
2478 { "(Reserved)", skd_reserved_isr },
2479 { "(Queue Full 0)", skd_qfull_isr },
2480 { "(Queue Full 1)", skd_qfull_isr },
2481 { "(Queue Full 2)", skd_qfull_isr },
2482 { "(Queue Full 3)", skd_qfull_isr },
2483 };
2484
2485 static int skd_acquire_msix(struct skd_device *skdev)
2486 {
2487 int i, rc;
2488 struct pci_dev *pdev = skdev->pdev;
2489
2490 rc = pci_alloc_irq_vectors(pdev, SKD_MAX_MSIX_COUNT, SKD_MAX_MSIX_COUNT,
2491 PCI_IRQ_MSIX);
2492 if (rc < 0) {
2493 dev_err(&skdev->pdev->dev, "failed to enable MSI-X %d\n", rc);
2494 goto out;
2495 }
2496
2497 skdev->msix_entries = kcalloc(SKD_MAX_MSIX_COUNT,
2498 sizeof(struct skd_msix_entry), GFP_KERNEL);
2499 if (!skdev->msix_entries) {
2500 rc = -ENOMEM;
2501 dev_err(&skdev->pdev->dev, "msix table allocation error\n");
2502 goto out;
2503 }
2504
2505 /* Enable MSI-X vectors for the base queue */
2506 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
2507 struct skd_msix_entry *qentry = &skdev->msix_entries[i];
2508
2509 snprintf(qentry->isr_name, sizeof(qentry->isr_name),
2510 "%s%d-msix %s", DRV_NAME, skdev->devno,
2511 msix_entries[i].name);
2512
2513 rc = devm_request_irq(&skdev->pdev->dev,
2514 pci_irq_vector(skdev->pdev, i),
2515 msix_entries[i].handler, 0,
2516 qentry->isr_name, skdev);
2517 if (rc) {
2518 dev_err(&skdev->pdev->dev,
2519 "Unable to register(%d) MSI-X handler %d: %s\n",
2520 rc, i, qentry->isr_name);
2521 goto msix_out;
2522 }
2523 }
2524
2525 dev_dbg(&skdev->pdev->dev, "%d msix irq(s) enabled\n",
2526 SKD_MAX_MSIX_COUNT);
2527 return 0;
2528
2529 msix_out:
2530 while (--i >= 0)
2531 devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), skdev);
2532 out:
2533 kfree(skdev->msix_entries);
2534 skdev->msix_entries = NULL;
2535 return rc;
2536 }
2537
2538 static int skd_acquire_irq(struct skd_device *skdev)
2539 {
2540 struct pci_dev *pdev = skdev->pdev;
2541 unsigned int irq_flag = PCI_IRQ_LEGACY;
2542 int rc;
2543
2544 if (skd_isr_type == SKD_IRQ_MSIX) {
2545 rc = skd_acquire_msix(skdev);
2546 if (!rc)
2547 return 0;
2548
2549 dev_err(&skdev->pdev->dev,
2550 "failed to enable MSI-X, re-trying with MSI %d\n", rc);
2551 }
2552
2553 snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d", DRV_NAME,
2554 skdev->devno);
2555
2556 if (skd_isr_type != SKD_IRQ_LEGACY)
2557 irq_flag |= PCI_IRQ_MSI;
2558 rc = pci_alloc_irq_vectors(pdev, 1, 1, irq_flag);
2559 if (rc < 0) {
2560 dev_err(&skdev->pdev->dev,
2561 "failed to allocate the MSI interrupt %d\n", rc);
2562 return rc;
2563 }
2564
2565 rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr,
2566 pdev->msi_enabled ? 0 : IRQF_SHARED,
2567 skdev->isr_name, skdev);
2568 if (rc) {
2569 pci_free_irq_vectors(pdev);
2570 dev_err(&skdev->pdev->dev, "failed to allocate interrupt %d\n",
2571 rc);
2572 return rc;
2573 }
2574
2575 return 0;
2576 }
2577
2578 static void skd_release_irq(struct skd_device *skdev)
2579 {
2580 struct pci_dev *pdev = skdev->pdev;
2581
2582 if (skdev->msix_entries) {
2583 int i;
2584
2585 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
2586 devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i),
2587 skdev);
2588 }
2589
2590 kfree(skdev->msix_entries);
2591 skdev->msix_entries = NULL;
2592 } else {
2593 devm_free_irq(&pdev->dev, pdev->irq, skdev);
2594 }
2595
2596 pci_free_irq_vectors(pdev);
2597 }
2598
2599 /*
2600 *****************************************************************************
2601 * CONSTRUCT
2602 *****************************************************************************
2603 */
2604
2605 static void *skd_alloc_dma(struct skd_device *skdev, struct kmem_cache *s,
2606 dma_addr_t *dma_handle, gfp_t gfp,
2607 enum dma_data_direction dir)
2608 {
2609 struct device *dev = &skdev->pdev->dev;
2610 void *buf;
2611
2612 buf = kmem_cache_alloc(s, gfp);
2613 if (!buf)
2614 return NULL;
2615 *dma_handle = dma_map_single(dev, buf,
2616 kmem_cache_size(s), dir);
2617 if (dma_mapping_error(dev, *dma_handle)) {
2618 kmem_cache_free(s, buf);
2619 buf = NULL;
2620 }
2621 return buf;
2622 }
2623
2624 static void skd_free_dma(struct skd_device *skdev, struct kmem_cache *s,
2625 void *vaddr, dma_addr_t dma_handle,
2626 enum dma_data_direction dir)
2627 {
2628 if (!vaddr)
2629 return;
2630
2631 dma_unmap_single(&skdev->pdev->dev, dma_handle,
2632 kmem_cache_size(s), dir);
2633 kmem_cache_free(s, vaddr);
2634 }
2635
2636 static int skd_cons_skcomp(struct skd_device *skdev)
2637 {
2638 int rc = 0;
2639 struct fit_completion_entry_v1 *skcomp;
2640
2641 dev_dbg(&skdev->pdev->dev,
2642 "comp pci_alloc, total bytes %zd entries %d\n",
2643 SKD_SKCOMP_SIZE, SKD_N_COMPLETION_ENTRY);
2644
2645 skcomp = dma_alloc_coherent(&skdev->pdev->dev, SKD_SKCOMP_SIZE,
2646 &skdev->cq_dma_address, GFP_KERNEL);
2647
2648 if (skcomp == NULL) {
2649 rc = -ENOMEM;
2650 goto err_out;
2651 }
2652
2653 skdev->skcomp_table = skcomp;
2654 skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp +
2655 sizeof(*skcomp) *
2656 SKD_N_COMPLETION_ENTRY);
2657
2658 err_out:
2659 return rc;
2660 }
2661
2662 static int skd_cons_skmsg(struct skd_device *skdev)
2663 {
2664 int rc = 0;
2665 u32 i;
2666
2667 dev_dbg(&skdev->pdev->dev,
2668 "skmsg_table kcalloc, struct %lu, count %u total %lu\n",
2669 sizeof(struct skd_fitmsg_context), skdev->num_fitmsg_context,
2670 sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context);
2671
2672 skdev->skmsg_table = kcalloc(skdev->num_fitmsg_context,
2673 sizeof(struct skd_fitmsg_context),
2674 GFP_KERNEL);
2675 if (skdev->skmsg_table == NULL) {
2676 rc = -ENOMEM;
2677 goto err_out;
2678 }
2679
2680 for (i = 0; i < skdev->num_fitmsg_context; i++) {
2681 struct skd_fitmsg_context *skmsg;
2682
2683 skmsg = &skdev->skmsg_table[i];
2684
2685 skmsg->id = i + SKD_ID_FIT_MSG;
2686
2687 skmsg->msg_buf = dma_alloc_coherent(&skdev->pdev->dev,
2688 SKD_N_FITMSG_BYTES,
2689 &skmsg->mb_dma_address,
2690 GFP_KERNEL);
2691 if (skmsg->msg_buf == NULL) {
2692 rc = -ENOMEM;
2693 goto err_out;
2694 }
2695
2696 WARN(((uintptr_t)skmsg->msg_buf | skmsg->mb_dma_address) &
2697 (FIT_QCMD_ALIGN - 1),
2698 "not aligned: msg_buf %p mb_dma_address %pad\n",
2699 skmsg->msg_buf, &skmsg->mb_dma_address);
2700 }
2701
2702 err_out:
2703 return rc;
2704 }
2705
2706 static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
2707 u32 n_sg,
2708 dma_addr_t *ret_dma_addr)
2709 {
2710 struct fit_sg_descriptor *sg_list;
2711
2712 sg_list = skd_alloc_dma(skdev, skdev->sglist_cache, ret_dma_addr,
2713 GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
2714
2715 if (sg_list != NULL) {
2716 uint64_t dma_address = *ret_dma_addr;
2717 u32 i;
2718
2719 for (i = 0; i < n_sg - 1; i++) {
2720 uint64_t ndp_off;
2721 ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
2722
2723 sg_list[i].next_desc_ptr = dma_address + ndp_off;
2724 }
2725 sg_list[i].next_desc_ptr = 0LL;
2726 }
2727
2728 return sg_list;
2729 }
2730
2731 static void skd_free_sg_list(struct skd_device *skdev,
2732 struct fit_sg_descriptor *sg_list,
2733 dma_addr_t dma_addr)
2734 {
2735 if (WARN_ON_ONCE(!sg_list))
2736 return;
2737
2738 skd_free_dma(skdev, skdev->sglist_cache, sg_list, dma_addr,
2739 DMA_TO_DEVICE);
2740 }
2741
2742 static int skd_init_request(struct blk_mq_tag_set *set, struct request *rq,
2743 unsigned int hctx_idx, unsigned int numa_node)
2744 {
2745 struct skd_device *skdev = set->driver_data;
2746 struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
2747
2748 skreq->state = SKD_REQ_STATE_IDLE;
2749 skreq->sg = (void *)(skreq + 1);
2750 sg_init_table(skreq->sg, skd_sgs_per_request);
2751 skreq->sksg_list = skd_cons_sg_list(skdev, skd_sgs_per_request,
2752 &skreq->sksg_dma_address);
2753
2754 return skreq->sksg_list ? 0 : -ENOMEM;
2755 }
2756
2757 static void skd_exit_request(struct blk_mq_tag_set *set, struct request *rq,
2758 unsigned int hctx_idx)
2759 {
2760 struct skd_device *skdev = set->driver_data;
2761 struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
2762
2763 skd_free_sg_list(skdev, skreq->sksg_list, skreq->sksg_dma_address);
2764 }
2765
2766 static int skd_cons_sksb(struct skd_device *skdev)
2767 {
2768 int rc = 0;
2769 struct skd_special_context *skspcl;
2770
2771 skspcl = &skdev->internal_skspcl;
2772
2773 skspcl->req.id = 0 + SKD_ID_INTERNAL;
2774 skspcl->req.state = SKD_REQ_STATE_IDLE;
2775
2776 skspcl->data_buf = skd_alloc_dma(skdev, skdev->databuf_cache,
2777 &skspcl->db_dma_address,
2778 GFP_DMA | __GFP_ZERO,
2779 DMA_BIDIRECTIONAL);
2780 if (skspcl->data_buf == NULL) {
2781 rc = -ENOMEM;
2782 goto err_out;
2783 }
2784
2785 skspcl->msg_buf = skd_alloc_dma(skdev, skdev->msgbuf_cache,
2786 &skspcl->mb_dma_address,
2787 GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
2788 if (skspcl->msg_buf == NULL) {
2789 rc = -ENOMEM;
2790 goto err_out;
2791 }
2792
2793 skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1,
2794 &skspcl->req.sksg_dma_address);
2795 if (skspcl->req.sksg_list == NULL) {
2796 rc = -ENOMEM;
2797 goto err_out;
2798 }
2799
2800 if (!skd_format_internal_skspcl(skdev)) {
2801 rc = -EINVAL;
2802 goto err_out;
2803 }
2804
2805 err_out:
2806 return rc;
2807 }
2808
2809 static const struct blk_mq_ops skd_mq_ops = {
2810 .queue_rq = skd_mq_queue_rq,
2811 .complete = skd_complete_rq,
2812 .timeout = skd_timed_out,
2813 .init_request = skd_init_request,
2814 .exit_request = skd_exit_request,
2815 };
2816
2817 static int skd_cons_disk(struct skd_device *skdev)
2818 {
2819 int rc = 0;
2820 struct gendisk *disk;
2821 struct request_queue *q;
2822 unsigned long flags;
2823
2824 disk = alloc_disk(SKD_MINORS_PER_DEVICE);
2825 if (!disk) {
2826 rc = -ENOMEM;
2827 goto err_out;
2828 }
2829
2830 skdev->disk = disk;
2831 sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno);
2832
2833 disk->major = skdev->major;
2834 disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE;
2835 disk->fops = &skd_blockdev_ops;
2836 disk->private_data = skdev;
2837
2838 memset(&skdev->tag_set, 0, sizeof(skdev->tag_set));
2839 skdev->tag_set.ops = &skd_mq_ops;
2840 skdev->tag_set.nr_hw_queues = 1;
2841 skdev->tag_set.queue_depth = skd_max_queue_depth;
2842 skdev->tag_set.cmd_size = sizeof(struct skd_request_context) +
2843 skdev->sgs_per_request * sizeof(struct scatterlist);
2844 skdev->tag_set.numa_node = NUMA_NO_NODE;
2845 skdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
2846 BLK_ALLOC_POLICY_TO_MQ_FLAG(BLK_TAG_ALLOC_FIFO);
2847 skdev->tag_set.driver_data = skdev;
2848 rc = blk_mq_alloc_tag_set(&skdev->tag_set);
2849 if (rc)
2850 goto err_out;
2851 q = blk_mq_init_queue(&skdev->tag_set);
2852 if (IS_ERR(q)) {
2853 blk_mq_free_tag_set(&skdev->tag_set);
2854 rc = PTR_ERR(q);
2855 goto err_out;
2856 }
2857 q->queuedata = skdev;
2858
2859 skdev->queue = q;
2860 disk->queue = q;
2861
2862 blk_queue_write_cache(q, true, true);
2863 blk_queue_max_segments(q, skdev->sgs_per_request);
2864 blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);
2865
2866 /* set optimal I/O size to 8KB */
2867 blk_queue_io_opt(q, 8192);
2868
2869 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2870 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2871
2872 blk_queue_rq_timeout(q, 8 * HZ);
2873
2874 spin_lock_irqsave(&skdev->lock, flags);
2875 dev_dbg(&skdev->pdev->dev, "stopping queue\n");
2876 blk_mq_stop_hw_queues(skdev->queue);
2877 spin_unlock_irqrestore(&skdev->lock, flags);
2878
2879 err_out:
2880 return rc;
2881 }
2882
2883 #define SKD_N_DEV_TABLE 16u
2884 static u32 skd_next_devno;
2885
2886 static struct skd_device *skd_construct(struct pci_dev *pdev)
2887 {
2888 struct skd_device *skdev;
2889 int blk_major = skd_major;
2890 size_t size;
2891 int rc;
2892
2893 skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
2894
2895 if (!skdev) {
2896 dev_err(&pdev->dev, "memory alloc failure\n");
2897 return NULL;
2898 }
2899
2900 skdev->state = SKD_DRVR_STATE_LOAD;
2901 skdev->pdev = pdev;
2902 skdev->devno = skd_next_devno++;
2903 skdev->major = blk_major;
2904 skdev->dev_max_queue_depth = 0;
2905
2906 skdev->num_req_context = skd_max_queue_depth;
2907 skdev->num_fitmsg_context = skd_max_queue_depth;
2908 skdev->cur_max_queue_depth = 1;
2909 skdev->queue_low_water_mark = 1;
2910 skdev->proto_ver = 99;
2911 skdev->sgs_per_request = skd_sgs_per_request;
2912 skdev->dbg_level = skd_dbg_level;
2913
2914 spin_lock_init(&skdev->lock);
2915
2916 INIT_WORK(&skdev->start_queue, skd_start_queue);
2917 INIT_WORK(&skdev->completion_worker, skd_completion_worker);
2918
2919 size = max(SKD_N_FITMSG_BYTES, SKD_N_SPECIAL_FITMSG_BYTES);
2920 skdev->msgbuf_cache = kmem_cache_create("skd-msgbuf", size, 0,
2921 SLAB_HWCACHE_ALIGN, NULL);
2922 if (!skdev->msgbuf_cache)
2923 goto err_out;
2924 WARN_ONCE(kmem_cache_size(skdev->msgbuf_cache) < size,
2925 "skd-msgbuf: %d < %zd\n",
2926 kmem_cache_size(skdev->msgbuf_cache), size);
2927 size = skd_sgs_per_request * sizeof(struct fit_sg_descriptor);
2928 skdev->sglist_cache = kmem_cache_create("skd-sglist", size, 0,
2929 SLAB_HWCACHE_ALIGN, NULL);
2930 if (!skdev->sglist_cache)
2931 goto err_out;
2932 WARN_ONCE(kmem_cache_size(skdev->sglist_cache) < size,
2933 "skd-sglist: %d < %zd\n",
2934 kmem_cache_size(skdev->sglist_cache), size);
2935 size = SKD_N_INTERNAL_BYTES;
2936 skdev->databuf_cache = kmem_cache_create("skd-databuf", size, 0,
2937 SLAB_HWCACHE_ALIGN, NULL);
2938 if (!skdev->databuf_cache)
2939 goto err_out;
2940 WARN_ONCE(kmem_cache_size(skdev->databuf_cache) < size,
2941 "skd-databuf: %d < %zd\n",
2942 kmem_cache_size(skdev->databuf_cache), size);
2943
2944 dev_dbg(&skdev->pdev->dev, "skcomp\n");
2945 rc = skd_cons_skcomp(skdev);
2946 if (rc < 0)
2947 goto err_out;
2948
2949 dev_dbg(&skdev->pdev->dev, "skmsg\n");
2950 rc = skd_cons_skmsg(skdev);
2951 if (rc < 0)
2952 goto err_out;
2953
2954 dev_dbg(&skdev->pdev->dev, "sksb\n");
2955 rc = skd_cons_sksb(skdev);
2956 if (rc < 0)
2957 goto err_out;
2958
2959 dev_dbg(&skdev->pdev->dev, "disk\n");
2960 rc = skd_cons_disk(skdev);
2961 if (rc < 0)
2962 goto err_out;
2963
2964 dev_dbg(&skdev->pdev->dev, "VICTORY\n");
2965 return skdev;
2966
2967 err_out:
2968 dev_dbg(&skdev->pdev->dev, "construct failed\n");
2969 skd_destruct(skdev);
2970 return NULL;
2971 }
2972
2973 /*
2974 *****************************************************************************
2975 * DESTRUCT (FREE)
2976 *****************************************************************************
2977 */
2978
2979 static void skd_free_skcomp(struct skd_device *skdev)
2980 {
2981 if (skdev->skcomp_table)
2982 dma_free_coherent(&skdev->pdev->dev, SKD_SKCOMP_SIZE,
2983 skdev->skcomp_table, skdev->cq_dma_address);
2984
2985 skdev->skcomp_table = NULL;
2986 skdev->cq_dma_address = 0;
2987 }
2988
2989 static void skd_free_skmsg(struct skd_device *skdev)
2990 {
2991 u32 i;
2992
2993 if (skdev->skmsg_table == NULL)
2994 return;
2995
2996 for (i = 0; i < skdev->num_fitmsg_context; i++) {
2997 struct skd_fitmsg_context *skmsg;
2998
2999 skmsg = &skdev->skmsg_table[i];
3000
3001 if (skmsg->msg_buf != NULL) {
3002 dma_free_coherent(&skdev->pdev->dev, SKD_N_FITMSG_BYTES,
3003 skmsg->msg_buf,
3004 skmsg->mb_dma_address);
3005 }
3006 skmsg->msg_buf = NULL;
3007 skmsg->mb_dma_address = 0;
3008 }
3009
3010 kfree(skdev->skmsg_table);
3011 skdev->skmsg_table = NULL;
3012 }
3013
3014 static void skd_free_sksb(struct skd_device *skdev)
3015 {
3016 struct skd_special_context *skspcl = &skdev->internal_skspcl;
3017
3018 skd_free_dma(skdev, skdev->databuf_cache, skspcl->data_buf,
3019 skspcl->db_dma_address, DMA_BIDIRECTIONAL);
3020
3021 skspcl->data_buf = NULL;
3022 skspcl->db_dma_address = 0;
3023
3024 skd_free_dma(skdev, skdev->msgbuf_cache, skspcl->msg_buf,
3025 skspcl->mb_dma_address, DMA_TO_DEVICE);
3026
3027 skspcl->msg_buf = NULL;
3028 skspcl->mb_dma_address = 0;
3029
3030 skd_free_sg_list(skdev, skspcl->req.sksg_list,
3031 skspcl->req.sksg_dma_address);
3032
3033 skspcl->req.sksg_list = NULL;
3034 skspcl->req.sksg_dma_address = 0;
3035 }
3036
3037 static void skd_free_disk(struct skd_device *skdev)
3038 {
3039 struct gendisk *disk = skdev->disk;
3040
3041 if (disk && (disk->flags & GENHD_FL_UP))
3042 del_gendisk(disk);
3043
3044 if (skdev->queue) {
3045 blk_cleanup_queue(skdev->queue);
3046 skdev->queue = NULL;
3047 if (disk)
3048 disk->queue = NULL;
3049 }
3050
3051 if (skdev->tag_set.tags)
3052 blk_mq_free_tag_set(&skdev->tag_set);
3053
3054 put_disk(disk);
3055 skdev->disk = NULL;
3056 }
3057
3058 static void skd_destruct(struct skd_device *skdev)
3059 {
3060 if (skdev == NULL)
3061 return;
3062
3063 cancel_work_sync(&skdev->start_queue);
3064
3065 dev_dbg(&skdev->pdev->dev, "disk\n");
3066 skd_free_disk(skdev);
3067
3068 dev_dbg(&skdev->pdev->dev, "sksb\n");
3069 skd_free_sksb(skdev);
3070
3071 dev_dbg(&skdev->pdev->dev, "skmsg\n");
3072 skd_free_skmsg(skdev);
3073
3074 dev_dbg(&skdev->pdev->dev, "skcomp\n");
3075 skd_free_skcomp(skdev);
3076
3077 kmem_cache_destroy(skdev->databuf_cache);
3078 kmem_cache_destroy(skdev->sglist_cache);
3079 kmem_cache_destroy(skdev->msgbuf_cache);
3080
3081 dev_dbg(&skdev->pdev->dev, "skdev\n");
3082 kfree(skdev);
3083 }
3084
3085 /*
3086 *****************************************************************************
3087 * BLOCK DEVICE (BDEV) GLUE
3088 *****************************************************************************
3089 */
3090
3091 static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3092 {
3093 struct skd_device *skdev;
3094 u64 capacity;
3095
3096 skdev = bdev->bd_disk->private_data;
3097
3098 dev_dbg(&skdev->pdev->dev, "%s: CMD[%s] getgeo device\n",
3099 bdev->bd_disk->disk_name, current->comm);
3100
3101 if (skdev->read_cap_is_valid) {
3102 capacity = get_capacity(skdev->disk);
3103 geo->heads = 64;
3104 geo->sectors = 255;
3105 geo->cylinders = (capacity) / (255 * 64);
3106
3107 return 0;
3108 }
3109 return -EIO;
3110 }
3111
3112 static int skd_bdev_attach(struct device *parent, struct skd_device *skdev)
3113 {
3114 dev_dbg(&skdev->pdev->dev, "add_disk\n");
3115 device_add_disk(parent, skdev->disk, NULL);
3116 return 0;
3117 }
3118
3119 static const struct block_device_operations skd_blockdev_ops = {
3120 .owner = THIS_MODULE,
3121 .getgeo = skd_bdev_getgeo,
3122 };
3123
3124 /*
3125 *****************************************************************************
3126 * PCIe DRIVER GLUE
3127 *****************************************************************************
3128 */
3129
3130 static const struct pci_device_id skd_pci_tbl[] = {
3131 { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120,
3132 PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
3133 { 0 } /* terminate list */
3134 };
3135
3136 MODULE_DEVICE_TABLE(pci, skd_pci_tbl);
3137
3138 static char *skd_pci_info(struct skd_device *skdev, char *str)
3139 {
3140 int pcie_reg;
3141
3142 strcpy(str, "PCIe (");
3143 pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP);
3144
3145 if (pcie_reg) {
3146
3147 char lwstr[6];
3148 uint16_t pcie_lstat, lspeed, lwidth;
3149
3150 pcie_reg += 0x12;
3151 pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat);
3152 lspeed = pcie_lstat & (0xF);
3153 lwidth = (pcie_lstat & 0x3F0) >> 4;
3154
3155 if (lspeed == 1)
3156 strcat(str, "2.5GT/s ");
3157 else if (lspeed == 2)
3158 strcat(str, "5.0GT/s ");
3159 else
3160 strcat(str, "<unknown> ");
3161 snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth);
3162 strcat(str, lwstr);
3163 }
3164 return str;
3165 }
3166
3167 static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
3168 {
3169 int i;
3170 int rc = 0;
3171 char pci_str[32];
3172 struct skd_device *skdev;
3173
3174 dev_dbg(&pdev->dev, "vendor=%04X device=%04x\n", pdev->vendor,
3175 pdev->device);
3176
3177 rc = pci_enable_device(pdev);
3178 if (rc)
3179 return rc;
3180 rc = pci_request_regions(pdev, DRV_NAME);
3181 if (rc)
3182 goto err_out;
3183 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
3184 if (rc)
3185 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
3186 if (rc) {
3187 dev_err(&pdev->dev, "DMA mask error %d\n", rc);
3188 goto err_out_regions;
3189 }
3190
3191 if (!skd_major) {
3192 rc = register_blkdev(0, DRV_NAME);
3193 if (rc < 0)
3194 goto err_out_regions;
3195 BUG_ON(!rc);
3196 skd_major = rc;
3197 }
3198
3199 skdev = skd_construct(pdev);
3200 if (skdev == NULL) {
3201 rc = -ENOMEM;
3202 goto err_out_regions;
3203 }
3204
3205 skd_pci_info(skdev, pci_str);
3206 dev_info(&pdev->dev, "%s 64bit\n", pci_str);
3207
3208 pci_set_master(pdev);
3209 rc = pci_enable_pcie_error_reporting(pdev);
3210 if (rc) {
3211 dev_err(&pdev->dev,
3212 "bad enable of PCIe error reporting rc=%d\n", rc);
3213 skdev->pcie_error_reporting_is_enabled = 0;
3214 } else
3215 skdev->pcie_error_reporting_is_enabled = 1;
3216
3217 pci_set_drvdata(pdev, skdev);
3218
3219 for (i = 0; i < SKD_MAX_BARS; i++) {
3220 skdev->mem_phys[i] = pci_resource_start(pdev, i);
3221 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
3222 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
3223 skdev->mem_size[i]);
3224 if (!skdev->mem_map[i]) {
3225 dev_err(&pdev->dev,
3226 "Unable to map adapter memory!\n");
3227 rc = -ENODEV;
3228 goto err_out_iounmap;
3229 }
3230 dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
3231 skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
3232 skdev->mem_size[i]);
3233 }
3234
3235 rc = skd_acquire_irq(skdev);
3236 if (rc) {
3237 dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
3238 goto err_out_iounmap;
3239 }
3240
3241 rc = skd_start_timer(skdev);
3242 if (rc)
3243 goto err_out_timer;
3244
3245 init_waitqueue_head(&skdev->waitq);
3246
3247 skd_start_device(skdev);
3248
3249 rc = wait_event_interruptible_timeout(skdev->waitq,
3250 (skdev->gendisk_on),
3251 (SKD_START_WAIT_SECONDS * HZ));
3252 if (skdev->gendisk_on > 0) {
3253 /* device came on-line after reset */
3254 skd_bdev_attach(&pdev->dev, skdev);
3255 rc = 0;
3256 } else {
3257 /* we timed out, something is wrong with the device,
3258 don't add the disk structure */
3259 dev_err(&pdev->dev, "error: waiting for s1120 timed out %d!\n",
3260 rc);
3261 /* in case of no error; we timeout with ENXIO */
3262 if (!rc)
3263 rc = -ENXIO;
3264 goto err_out_timer;
3265 }
3266
3267 return rc;
3268
3269 err_out_timer:
3270 skd_stop_device(skdev);
3271 skd_release_irq(skdev);
3272
3273 err_out_iounmap:
3274 for (i = 0; i < SKD_MAX_BARS; i++)
3275 if (skdev->mem_map[i])
3276 iounmap(skdev->mem_map[i]);
3277
3278 if (skdev->pcie_error_reporting_is_enabled)
3279 pci_disable_pcie_error_reporting(pdev);
3280
3281 skd_destruct(skdev);
3282
3283 err_out_regions:
3284 pci_release_regions(pdev);
3285
3286 err_out:
3287 pci_disable_device(pdev);
3288 pci_set_drvdata(pdev, NULL);
3289 return rc;
3290 }
3291
3292 static void skd_pci_remove(struct pci_dev *pdev)
3293 {
3294 int i;
3295 struct skd_device *skdev;
3296
3297 skdev = pci_get_drvdata(pdev);
3298 if (!skdev) {
3299 dev_err(&pdev->dev, "no device data for PCI\n");
3300 return;
3301 }
3302 skd_stop_device(skdev);
3303 skd_release_irq(skdev);
3304
3305 for (i = 0; i < SKD_MAX_BARS; i++)
3306 if (skdev->mem_map[i])
3307 iounmap(skdev->mem_map[i]);
3308
3309 if (skdev->pcie_error_reporting_is_enabled)
3310 pci_disable_pcie_error_reporting(pdev);
3311
3312 skd_destruct(skdev);
3313
3314 pci_release_regions(pdev);
3315 pci_disable_device(pdev);
3316 pci_set_drvdata(pdev, NULL);
3317
3318 return;
3319 }
3320
3321 static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
3322 {
3323 int i;
3324 struct skd_device *skdev;
3325
3326 skdev = pci_get_drvdata(pdev);
3327 if (!skdev) {
3328 dev_err(&pdev->dev, "no device data for PCI\n");
3329 return -EIO;
3330 }
3331
3332 skd_stop_device(skdev);
3333
3334 skd_release_irq(skdev);
3335
3336 for (i = 0; i < SKD_MAX_BARS; i++)
3337 if (skdev->mem_map[i])
3338 iounmap(skdev->mem_map[i]);
3339
3340 if (skdev->pcie_error_reporting_is_enabled)
3341 pci_disable_pcie_error_reporting(pdev);
3342
3343 pci_release_regions(pdev);
3344 pci_save_state(pdev);
3345 pci_disable_device(pdev);
3346 pci_set_power_state(pdev, pci_choose_state(pdev, state));
3347 return 0;
3348 }
3349
3350 static int skd_pci_resume(struct pci_dev *pdev)
3351 {
3352 int i;
3353 int rc = 0;
3354 struct skd_device *skdev;
3355
3356 skdev = pci_get_drvdata(pdev);
3357 if (!skdev) {
3358 dev_err(&pdev->dev, "no device data for PCI\n");
3359 return -1;
3360 }
3361
3362 pci_set_power_state(pdev, PCI_D0);
3363 pci_enable_wake(pdev, PCI_D0, 0);
3364 pci_restore_state(pdev);
3365
3366 rc = pci_enable_device(pdev);
3367 if (rc)
3368 return rc;
3369 rc = pci_request_regions(pdev, DRV_NAME);
3370 if (rc)
3371 goto err_out;
3372 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
3373 if (rc)
3374 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
3375 if (rc) {
3376 dev_err(&pdev->dev, "DMA mask error %d\n", rc);
3377 goto err_out_regions;
3378 }
3379
3380 pci_set_master(pdev);
3381 rc = pci_enable_pcie_error_reporting(pdev);
3382 if (rc) {
3383 dev_err(&pdev->dev,
3384 "bad enable of PCIe error reporting rc=%d\n", rc);
3385 skdev->pcie_error_reporting_is_enabled = 0;
3386 } else
3387 skdev->pcie_error_reporting_is_enabled = 1;
3388
3389 for (i = 0; i < SKD_MAX_BARS; i++) {
3390
3391 skdev->mem_phys[i] = pci_resource_start(pdev, i);
3392 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
3393 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
3394 skdev->mem_size[i]);
3395 if (!skdev->mem_map[i]) {
3396 dev_err(&pdev->dev, "Unable to map adapter memory!\n");
3397 rc = -ENODEV;
3398 goto err_out_iounmap;
3399 }
3400 dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
3401 skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
3402 skdev->mem_size[i]);
3403 }
3404 rc = skd_acquire_irq(skdev);
3405 if (rc) {
3406 dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
3407 goto err_out_iounmap;
3408 }
3409
3410 rc = skd_start_timer(skdev);
3411 if (rc)
3412 goto err_out_timer;
3413
3414 init_waitqueue_head(&skdev->waitq);
3415
3416 skd_start_device(skdev);
3417
3418 return rc;
3419
3420 err_out_timer:
3421 skd_stop_device(skdev);
3422 skd_release_irq(skdev);
3423
3424 err_out_iounmap:
3425 for (i = 0; i < SKD_MAX_BARS; i++)
3426 if (skdev->mem_map[i])
3427 iounmap(skdev->mem_map[i]);
3428
3429 if (skdev->pcie_error_reporting_is_enabled)
3430 pci_disable_pcie_error_reporting(pdev);
3431
3432 err_out_regions:
3433 pci_release_regions(pdev);
3434
3435 err_out:
3436 pci_disable_device(pdev);
3437 return rc;
3438 }
3439
3440 static void skd_pci_shutdown(struct pci_dev *pdev)
3441 {
3442 struct skd_device *skdev;
3443
3444 dev_err(&pdev->dev, "%s called\n", __func__);
3445
3446 skdev = pci_get_drvdata(pdev);
3447 if (!skdev) {
3448 dev_err(&pdev->dev, "no device data for PCI\n");
3449 return;
3450 }
3451
3452 dev_err(&pdev->dev, "calling stop\n");
3453 skd_stop_device(skdev);
3454 }
3455
3456 static struct pci_driver skd_driver = {
3457 .name = DRV_NAME,
3458 .id_table = skd_pci_tbl,
3459 .probe = skd_pci_probe,
3460 .remove = skd_pci_remove,
3461 .suspend = skd_pci_suspend,
3462 .resume = skd_pci_resume,
3463 .shutdown = skd_pci_shutdown,
3464 };
3465
3466 /*
3467 *****************************************************************************
3468 * LOGGING SUPPORT
3469 *****************************************************************************
3470 */
3471
3472 const char *skd_drive_state_to_str(int state)
3473 {
3474 switch (state) {
3475 case FIT_SR_DRIVE_OFFLINE:
3476 return "OFFLINE";
3477 case FIT_SR_DRIVE_INIT:
3478 return "INIT";
3479 case FIT_SR_DRIVE_ONLINE:
3480 return "ONLINE";
3481 case FIT_SR_DRIVE_BUSY:
3482 return "BUSY";
3483 case FIT_SR_DRIVE_FAULT:
3484 return "FAULT";
3485 case FIT_SR_DRIVE_DEGRADED:
3486 return "DEGRADED";
3487 case FIT_SR_PCIE_LINK_DOWN:
3488 return "INK_DOWN";
3489 case FIT_SR_DRIVE_SOFT_RESET:
3490 return "SOFT_RESET";
3491 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
3492 return "NEED_FW";
3493 case FIT_SR_DRIVE_INIT_FAULT:
3494 return "INIT_FAULT";
3495 case FIT_SR_DRIVE_BUSY_SANITIZE:
3496 return "BUSY_SANITIZE";
3497 case FIT_SR_DRIVE_BUSY_ERASE:
3498 return "BUSY_ERASE";
3499 case FIT_SR_DRIVE_FW_BOOTING:
3500 return "FW_BOOTING";
3501 default:
3502 return "???";
3503 }
3504 }
3505
3506 const char *skd_skdev_state_to_str(enum skd_drvr_state state)
3507 {
3508 switch (state) {
3509 case SKD_DRVR_STATE_LOAD:
3510 return "LOAD";
3511 case SKD_DRVR_STATE_IDLE:
3512 return "IDLE";
3513 case SKD_DRVR_STATE_BUSY:
3514 return "BUSY";
3515 case SKD_DRVR_STATE_STARTING:
3516 return "STARTING";
3517 case SKD_DRVR_STATE_ONLINE:
3518 return "ONLINE";
3519 case SKD_DRVR_STATE_PAUSING:
3520 return "PAUSING";
3521 case SKD_DRVR_STATE_PAUSED:
3522 return "PAUSED";
3523 case SKD_DRVR_STATE_RESTARTING:
3524 return "RESTARTING";
3525 case SKD_DRVR_STATE_RESUMING:
3526 return "RESUMING";
3527 case SKD_DRVR_STATE_STOPPING:
3528 return "STOPPING";
3529 case SKD_DRVR_STATE_SYNCING:
3530 return "SYNCING";
3531 case SKD_DRVR_STATE_FAULT:
3532 return "FAULT";
3533 case SKD_DRVR_STATE_DISAPPEARED:
3534 return "DISAPPEARED";
3535 case SKD_DRVR_STATE_BUSY_ERASE:
3536 return "BUSY_ERASE";
3537 case SKD_DRVR_STATE_BUSY_SANITIZE:
3538 return "BUSY_SANITIZE";
3539 case SKD_DRVR_STATE_BUSY_IMMINENT:
3540 return "BUSY_IMMINENT";
3541 case SKD_DRVR_STATE_WAIT_BOOT:
3542 return "WAIT_BOOT";
3543
3544 default:
3545 return "???";
3546 }
3547 }
3548
3549 static const char *skd_skreq_state_to_str(enum skd_req_state state)
3550 {
3551 switch (state) {
3552 case SKD_REQ_STATE_IDLE:
3553 return "IDLE";
3554 case SKD_REQ_STATE_SETUP:
3555 return "SETUP";
3556 case SKD_REQ_STATE_BUSY:
3557 return "BUSY";
3558 case SKD_REQ_STATE_COMPLETED:
3559 return "COMPLETED";
3560 case SKD_REQ_STATE_TIMEOUT:
3561 return "TIMEOUT";
3562 default:
3563 return "???";
3564 }
3565 }
3566
3567 static void skd_log_skdev(struct skd_device *skdev, const char *event)
3568 {
3569 dev_dbg(&skdev->pdev->dev, "skdev=%p event='%s'\n", skdev, event);
3570 dev_dbg(&skdev->pdev->dev, " drive_state=%s(%d) driver_state=%s(%d)\n",
3571 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
3572 skd_skdev_state_to_str(skdev->state), skdev->state);
3573 dev_dbg(&skdev->pdev->dev, " busy=%d limit=%d dev=%d lowat=%d\n",
3574 skd_in_flight(skdev), skdev->cur_max_queue_depth,
3575 skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
3576 dev_dbg(&skdev->pdev->dev, " cycle=%d cycle_ix=%d\n",
3577 skdev->skcomp_cycle, skdev->skcomp_ix);
3578 }
3579
3580 static void skd_log_skreq(struct skd_device *skdev,
3581 struct skd_request_context *skreq, const char *event)
3582 {
3583 struct request *req = blk_mq_rq_from_pdu(skreq);
3584 u32 lba = blk_rq_pos(req);
3585 u32 count = blk_rq_sectors(req);
3586
3587 dev_dbg(&skdev->pdev->dev, "skreq=%p event='%s'\n", skreq, event);
3588 dev_dbg(&skdev->pdev->dev, " state=%s(%d) id=0x%04x fitmsg=0x%04x\n",
3589 skd_skreq_state_to_str(skreq->state), skreq->state, skreq->id,
3590 skreq->fitmsg_id);
3591 dev_dbg(&skdev->pdev->dev, " sg_dir=%d n_sg=%d\n",
3592 skreq->data_dir, skreq->n_sg);
3593
3594 dev_dbg(&skdev->pdev->dev,
3595 "req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba, lba,
3596 count, count, (int)rq_data_dir(req));
3597 }
3598
3599 /*
3600 *****************************************************************************
3601 * MODULE GLUE
3602 *****************************************************************************
3603 */
3604
3605 static int __init skd_init(void)
3606 {
3607 BUILD_BUG_ON(sizeof(struct fit_completion_entry_v1) != 8);
3608 BUILD_BUG_ON(sizeof(struct fit_comp_error_info) != 32);
3609 BUILD_BUG_ON(sizeof(struct skd_command_header) != 16);
3610 BUILD_BUG_ON(sizeof(struct skd_scsi_request) != 32);
3611 BUILD_BUG_ON(sizeof(struct driver_inquiry_data) != 44);
3612 BUILD_BUG_ON(offsetof(struct skd_msg_buf, fmh) != 0);
3613 BUILD_BUG_ON(offsetof(struct skd_msg_buf, scsi) != 64);
3614 BUILD_BUG_ON(sizeof(struct skd_msg_buf) != SKD_N_FITMSG_BYTES);
3615
3616 switch (skd_isr_type) {
3617 case SKD_IRQ_LEGACY:
3618 case SKD_IRQ_MSI:
3619 case SKD_IRQ_MSIX:
3620 break;
3621 default:
3622 pr_err(PFX "skd_isr_type %d invalid, re-set to %d\n",
3623 skd_isr_type, SKD_IRQ_DEFAULT);
3624 skd_isr_type = SKD_IRQ_DEFAULT;
3625 }
3626
3627 if (skd_max_queue_depth < 1 ||
3628 skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) {
3629 pr_err(PFX "skd_max_queue_depth %d invalid, re-set to %d\n",
3630 skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT);
3631 skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
3632 }
3633
3634 if (skd_max_req_per_msg < 1 ||
3635 skd_max_req_per_msg > SKD_MAX_REQ_PER_MSG) {
3636 pr_err(PFX "skd_max_req_per_msg %d invalid, re-set to %d\n",
3637 skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT);
3638 skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
3639 }
3640
3641 if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) {
3642 pr_err(PFX "skd_sg_per_request %d invalid, re-set to %d\n",
3643 skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT);
3644 skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
3645 }
3646
3647 if (skd_dbg_level < 0 || skd_dbg_level > 2) {
3648 pr_err(PFX "skd_dbg_level %d invalid, re-set to %d\n",
3649 skd_dbg_level, 0);
3650 skd_dbg_level = 0;
3651 }
3652
3653 if (skd_isr_comp_limit < 0) {
3654 pr_err(PFX "skd_isr_comp_limit %d invalid, set to %d\n",
3655 skd_isr_comp_limit, 0);
3656 skd_isr_comp_limit = 0;
3657 }
3658
3659 return pci_register_driver(&skd_driver);
3660 }
3661
3662 static void __exit skd_exit(void)
3663 {
3664 pci_unregister_driver(&skd_driver);
3665
3666 if (skd_major)
3667 unregister_blkdev(skd_major, DRV_NAME);
3668 }
3669
3670 module_init(skd_init);
3671 module_exit(skd_exit);
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