2 * Driver for sTec s1120 PCIe SSDs. sTec was acquired in 2013 by HGST and HGST
3 * was acquired by Western Digital in 2012.
5 * Copyright 2012 sTec, Inc.
6 * Copyright (c) 2017 Western Digital Corporation or its affiliates.
8 * This file is part of the Linux kernel, and is made available under
9 * the terms of the GNU General Public License version 2.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/pci.h>
16 #include <linux/slab.h>
17 #include <linux/spinlock.h>
18 #include <linux/blkdev.h>
19 #include <linux/blk-mq.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/compiler.h>
23 #include <linux/workqueue.h>
24 #include <linux/delay.h>
25 #include <linux/time.h>
26 #include <linux/hdreg.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/completion.h>
29 #include <linux/scatterlist.h>
30 #include <linux/version.h>
31 #include <linux/err.h>
32 #include <linux/aer.h>
33 #include <linux/wait.h>
34 #include <linux/stringify.h>
35 #include <linux/slab_def.h>
36 #include <scsi/scsi.h>
39 #include <linux/uaccess.h>
40 #include <asm/unaligned.h>
42 #include "skd_s1120.h"
44 static int skd_dbg_level;
45 static int skd_isr_comp_limit = 4;
47 #define SKD_ASSERT(expr) \
49 if (unlikely(!(expr))) { \
50 pr_err("Assertion failed! %s,%s,%s,line=%d\n", \
51 # expr, __FILE__, __func__, __LINE__); \
55 #define DRV_NAME "skd"
56 #define PFX DRV_NAME ": "
58 MODULE_LICENSE("GPL");
60 MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver");
62 #define PCI_VENDOR_ID_STEC 0x1B39
63 #define PCI_DEVICE_ID_S1120 0x0001
65 #define SKD_FUA_NV (1 << 1)
66 #define SKD_MINORS_PER_DEVICE 16
68 #define SKD_MAX_QUEUE_DEPTH 200u
70 #define SKD_PAUSE_TIMEOUT (5 * 1000)
72 #define SKD_N_FITMSG_BYTES (512u)
73 #define SKD_MAX_REQ_PER_MSG 14
75 #define SKD_N_SPECIAL_FITMSG_BYTES (128u)
77 /* SG elements are 32 bytes, so we can make this 4096 and still be under the
78 * 128KB limit. That allows 4096*4K = 16M xfer size
80 #define SKD_N_SG_PER_REQ_DEFAULT 256u
82 #define SKD_N_COMPLETION_ENTRY 256u
83 #define SKD_N_READ_CAP_BYTES (8u)
85 #define SKD_N_INTERNAL_BYTES (512u)
87 #define SKD_SKCOMP_SIZE \
88 ((sizeof(struct fit_completion_entry_v1) + \
89 sizeof(struct fit_comp_error_info)) * SKD_N_COMPLETION_ENTRY)
91 /* 5 bits of uniqifier, 0xF800 */
92 #define SKD_ID_TABLE_MASK (3u << 8u)
93 #define SKD_ID_RW_REQUEST (0u << 8u)
94 #define SKD_ID_INTERNAL (1u << 8u)
95 #define SKD_ID_FIT_MSG (3u << 8u)
96 #define SKD_ID_SLOT_MASK 0x00FFu
97 #define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu
99 #define SKD_N_MAX_SECTORS 2048u
101 #define SKD_MAX_RETRIES 2u
103 #define SKD_TIMER_SECONDS(seconds) (seconds)
104 #define SKD_TIMER_MINUTES(minutes) ((minutes) * (60))
106 #define INQ_STD_NBYTES 36
108 enum skd_drvr_state {
112 SKD_DRVR_STATE_STARTING,
113 SKD_DRVR_STATE_ONLINE,
114 SKD_DRVR_STATE_PAUSING,
115 SKD_DRVR_STATE_PAUSED,
116 SKD_DRVR_STATE_RESTARTING,
117 SKD_DRVR_STATE_RESUMING,
118 SKD_DRVR_STATE_STOPPING,
119 SKD_DRVR_STATE_FAULT,
120 SKD_DRVR_STATE_DISAPPEARED,
121 SKD_DRVR_STATE_PROTOCOL_MISMATCH,
122 SKD_DRVR_STATE_BUSY_ERASE,
123 SKD_DRVR_STATE_BUSY_SANITIZE,
124 SKD_DRVR_STATE_BUSY_IMMINENT,
125 SKD_DRVR_STATE_WAIT_BOOT,
126 SKD_DRVR_STATE_SYNCING,
129 #define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u)
130 #define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u)
131 #define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u)
132 #define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u)
133 #define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u)
134 #define SKD_START_WAIT_SECONDS 90u
140 SKD_REQ_STATE_COMPLETED,
141 SKD_REQ_STATE_TIMEOUT,
144 enum skd_check_status_action {
145 SKD_CHECK_STATUS_REPORT_GOOD,
146 SKD_CHECK_STATUS_REPORT_SMART_ALERT,
147 SKD_CHECK_STATUS_REQUEUE_REQUEST,
148 SKD_CHECK_STATUS_REPORT_ERROR,
149 SKD_CHECK_STATUS_BUSY_IMMINENT,
153 struct fit_msg_hdr fmh;
154 struct skd_scsi_request scsi[SKD_MAX_REQ_PER_MSG];
157 struct skd_fitmsg_context {
162 struct skd_msg_buf *msg_buf;
163 dma_addr_t mb_dma_address;
166 struct skd_request_context {
167 enum skd_req_state state;
174 enum dma_data_direction data_dir;
175 struct scatterlist *sg;
179 struct fit_sg_descriptor *sksg_list;
180 dma_addr_t sksg_dma_address;
182 struct fit_completion_entry_v1 completion;
184 struct fit_comp_error_info err_info;
189 struct skd_special_context {
190 struct skd_request_context req;
193 dma_addr_t db_dma_address;
195 struct skd_msg_buf *msg_buf;
196 dma_addr_t mb_dma_address;
199 typedef enum skd_irq_type {
205 #define SKD_MAX_BARS 2
208 void __iomem *mem_map[SKD_MAX_BARS];
209 resource_size_t mem_phys[SKD_MAX_BARS];
210 u32 mem_size[SKD_MAX_BARS];
212 struct skd_msix_entry *msix_entries;
214 struct pci_dev *pdev;
215 int pcie_error_reporting_is_enabled;
218 struct gendisk *disk;
219 struct blk_mq_tag_set tag_set;
220 struct request_queue *queue;
221 struct skd_fitmsg_context *skmsg;
222 struct device *class_dev;
230 enum skd_drvr_state state;
233 u32 cur_max_queue_depth;
234 u32 queue_low_water_mark;
235 u32 dev_max_queue_depth;
237 u32 num_fitmsg_context;
240 struct skd_fitmsg_context *skmsg_table;
242 struct skd_special_context internal_skspcl;
243 u32 read_cap_blocksize;
244 u32 read_cap_last_lba;
245 int read_cap_is_valid;
246 int inquiry_is_valid;
247 u8 inq_serial_num[13]; /*12 chars plus null term */
251 struct kmem_cache *msgbuf_cache;
252 struct kmem_cache *sglist_cache;
253 struct kmem_cache *databuf_cache;
254 struct fit_completion_entry_v1 *skcomp_table;
255 struct fit_comp_error_info *skerr_table;
256 dma_addr_t cq_dma_address;
258 wait_queue_head_t waitq;
260 struct timer_list timer;
270 u32 connect_time_stamp;
272 #define SKD_MAX_CONNECT_RETRIES 16
277 struct work_struct start_queue;
278 struct work_struct completion_worker;
281 #define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF)
282 #define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF)
283 #define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF)
285 static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset)
287 u32 val = readl(skdev->mem_map[1] + offset);
289 if (unlikely(skdev->dbg_level >= 2))
290 dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
294 static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
297 writel(val, skdev->mem_map[1] + offset);
298 if (unlikely(skdev->dbg_level >= 2))
299 dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
302 static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
305 writeq(val, skdev->mem_map[1] + offset);
306 if (unlikely(skdev->dbg_level >= 2))
307 dev_dbg(&skdev->pdev->dev, "offset %x = %016llx\n", offset,
312 #define SKD_IRQ_DEFAULT SKD_IRQ_MSIX
313 static int skd_isr_type = SKD_IRQ_DEFAULT;
315 module_param(skd_isr_type, int, 0444);
316 MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability."
317 " (0==legacy, 1==MSI, 2==MSI-X, default==1)");
319 #define SKD_MAX_REQ_PER_MSG_DEFAULT 1
320 static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
322 module_param(skd_max_req_per_msg, int, 0444);
323 MODULE_PARM_DESC(skd_max_req_per_msg,
324 "Maximum SCSI requests packed in a single message."
325 " (1-" __stringify(SKD_MAX_REQ_PER_MSG) ", default==1)");
327 #define SKD_MAX_QUEUE_DEPTH_DEFAULT 64
328 #define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64"
329 static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
331 module_param(skd_max_queue_depth, int, 0444);
332 MODULE_PARM_DESC(skd_max_queue_depth,
333 "Maximum SCSI requests issued to s1120."
334 " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")");
336 static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
337 module_param(skd_sgs_per_request, int, 0444);
338 MODULE_PARM_DESC(skd_sgs_per_request,
339 "Maximum SG elements per block request."
340 " (1-4096, default==256)");
342 static int skd_max_pass_thru = 1;
343 module_param(skd_max_pass_thru, int, 0444);
344 MODULE_PARM_DESC(skd_max_pass_thru,
345 "Maximum SCSI pass-thru at a time. IGNORED");
347 module_param(skd_dbg_level, int, 0444);
348 MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)");
350 module_param(skd_isr_comp_limit, int, 0444);
351 MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4");
353 /* Major device number dynamically assigned. */
354 static u32 skd_major;
356 static void skd_destruct(struct skd_device *skdev);
357 static const struct block_device_operations skd_blockdev_ops;
358 static void skd_send_fitmsg(struct skd_device *skdev,
359 struct skd_fitmsg_context *skmsg);
360 static void skd_send_special_fitmsg(struct skd_device *skdev,
361 struct skd_special_context *skspcl);
362 static bool skd_preop_sg_list(struct skd_device *skdev,
363 struct skd_request_context *skreq);
364 static void skd_postop_sg_list(struct skd_device *skdev,
365 struct skd_request_context *skreq);
367 static void skd_restart_device(struct skd_device *skdev);
368 static int skd_quiesce_dev(struct skd_device *skdev);
369 static int skd_unquiesce_dev(struct skd_device *skdev);
370 static void skd_disable_interrupts(struct skd_device *skdev);
371 static void skd_isr_fwstate(struct skd_device *skdev);
372 static void skd_recover_requests(struct skd_device *skdev);
373 static void skd_soft_reset(struct skd_device *skdev);
375 const char *skd_drive_state_to_str(int state);
376 const char *skd_skdev_state_to_str(enum skd_drvr_state state);
377 static void skd_log_skdev(struct skd_device *skdev, const char *event);
378 static void skd_log_skreq(struct skd_device *skdev,
379 struct skd_request_context *skreq, const char *event);
382 *****************************************************************************
383 * READ/WRITE REQUESTS
384 *****************************************************************************
386 static void skd_inc_in_flight(struct request *rq, void *data, bool reserved)
393 static int skd_in_flight(struct skd_device *skdev)
397 blk_mq_tagset_busy_iter(&skdev->tag_set, skd_inc_in_flight, &count);
403 skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
404 int data_dir, unsigned lba,
407 if (data_dir == READ)
408 scsi_req->cdb[0] = READ_10;
410 scsi_req->cdb[0] = WRITE_10;
412 scsi_req->cdb[1] = 0;
413 scsi_req->cdb[2] = (lba & 0xff000000) >> 24;
414 scsi_req->cdb[3] = (lba & 0xff0000) >> 16;
415 scsi_req->cdb[4] = (lba & 0xff00) >> 8;
416 scsi_req->cdb[5] = (lba & 0xff);
417 scsi_req->cdb[6] = 0;
418 scsi_req->cdb[7] = (count & 0xff00) >> 8;
419 scsi_req->cdb[8] = count & 0xff;
420 scsi_req->cdb[9] = 0;
424 skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req,
425 struct skd_request_context *skreq)
427 skreq->flush_cmd = 1;
429 scsi_req->cdb[0] = SYNCHRONIZE_CACHE;
430 scsi_req->cdb[1] = 0;
431 scsi_req->cdb[2] = 0;
432 scsi_req->cdb[3] = 0;
433 scsi_req->cdb[4] = 0;
434 scsi_req->cdb[5] = 0;
435 scsi_req->cdb[6] = 0;
436 scsi_req->cdb[7] = 0;
437 scsi_req->cdb[8] = 0;
438 scsi_req->cdb[9] = 0;
442 * Return true if and only if all pending requests should be failed.
444 static bool skd_fail_all(struct request_queue *q)
446 struct skd_device *skdev = q->queuedata;
448 SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE);
450 skd_log_skdev(skdev, "req_not_online");
451 switch (skdev->state) {
452 case SKD_DRVR_STATE_PAUSING:
453 case SKD_DRVR_STATE_PAUSED:
454 case SKD_DRVR_STATE_STARTING:
455 case SKD_DRVR_STATE_RESTARTING:
456 case SKD_DRVR_STATE_WAIT_BOOT:
457 /* In case of starting, we haven't started the queue,
458 * so we can't get here... but requests are
459 * possibly hanging out waiting for us because we
460 * reported the dev/skd0 already. They'll wait
461 * forever if connect doesn't complete.
462 * What to do??? delay dev/skd0 ??
464 case SKD_DRVR_STATE_BUSY:
465 case SKD_DRVR_STATE_BUSY_IMMINENT:
466 case SKD_DRVR_STATE_BUSY_ERASE:
469 case SKD_DRVR_STATE_BUSY_SANITIZE:
470 case SKD_DRVR_STATE_STOPPING:
471 case SKD_DRVR_STATE_SYNCING:
472 case SKD_DRVR_STATE_FAULT:
473 case SKD_DRVR_STATE_DISAPPEARED:
479 static blk_status_t skd_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
480 const struct blk_mq_queue_data *mqd)
482 struct request *const req = mqd->rq;
483 struct request_queue *const q = req->q;
484 struct skd_device *skdev = q->queuedata;
485 struct skd_fitmsg_context *skmsg;
486 struct fit_msg_hdr *fmh;
487 const u32 tag = blk_mq_unique_tag(req);
488 struct skd_request_context *const skreq = blk_mq_rq_to_pdu(req);
489 struct skd_scsi_request *scsi_req;
490 unsigned long flags = 0;
491 const u32 lba = blk_rq_pos(req);
492 const u32 count = blk_rq_sectors(req);
493 const int data_dir = rq_data_dir(req);
495 if (unlikely(skdev->state != SKD_DRVR_STATE_ONLINE))
496 return skd_fail_all(q) ? BLK_STS_IOERR : BLK_STS_RESOURCE;
498 blk_mq_start_request(req);
500 WARN_ONCE(tag >= skd_max_queue_depth, "%#x > %#x (nr_requests = %lu)\n",
501 tag, skd_max_queue_depth, q->nr_requests);
503 SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
505 dev_dbg(&skdev->pdev->dev,
506 "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba,
507 lba, count, count, data_dir);
509 skreq->id = tag + SKD_ID_RW_REQUEST;
510 skreq->flush_cmd = 0;
512 skreq->sg_byte_count = 0;
514 skreq->fitmsg_id = 0;
516 skreq->data_dir = data_dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
518 if (req->bio && !skd_preop_sg_list(skdev, skreq)) {
519 dev_dbg(&skdev->pdev->dev, "error Out\n");
520 skreq->status = BLK_STS_RESOURCE;
521 blk_mq_complete_request(req);
525 dma_sync_single_for_device(&skdev->pdev->dev, skreq->sksg_dma_address,
527 sizeof(struct fit_sg_descriptor),
530 /* Either a FIT msg is in progress or we have to start one. */
531 if (skd_max_req_per_msg == 1) {
534 spin_lock_irqsave(&skdev->lock, flags);
535 skmsg = skdev->skmsg;
538 skmsg = &skdev->skmsg_table[tag];
539 skdev->skmsg = skmsg;
541 /* Initialize the FIT msg header */
542 fmh = &skmsg->msg_buf->fmh;
543 memset(fmh, 0, sizeof(*fmh));
544 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
545 skmsg->length = sizeof(*fmh);
547 fmh = &skmsg->msg_buf->fmh;
550 skreq->fitmsg_id = skmsg->id;
552 scsi_req = &skmsg->msg_buf->scsi[fmh->num_protocol_cmds_coalesced];
553 memset(scsi_req, 0, sizeof(*scsi_req));
555 scsi_req->hdr.tag = skreq->id;
556 scsi_req->hdr.sg_list_dma_address =
557 cpu_to_be64(skreq->sksg_dma_address);
559 if (req_op(req) == REQ_OP_FLUSH) {
560 skd_prep_zerosize_flush_cdb(scsi_req, skreq);
561 SKD_ASSERT(skreq->flush_cmd == 1);
563 skd_prep_rw_cdb(scsi_req, data_dir, lba, count);
566 if (req->cmd_flags & REQ_FUA)
567 scsi_req->cdb[1] |= SKD_FUA_NV;
569 scsi_req->hdr.sg_list_len_bytes = cpu_to_be32(skreq->sg_byte_count);
571 /* Complete resource allocations. */
572 skreq->state = SKD_REQ_STATE_BUSY;
574 skmsg->length += sizeof(struct skd_scsi_request);
575 fmh->num_protocol_cmds_coalesced++;
577 dev_dbg(&skdev->pdev->dev, "req=0x%x busy=%d\n", skreq->id,
578 skd_in_flight(skdev));
581 * If the FIT msg buffer is full send it.
583 if (skd_max_req_per_msg == 1) {
584 skd_send_fitmsg(skdev, skmsg);
587 fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
588 skd_send_fitmsg(skdev, skmsg);
591 spin_unlock_irqrestore(&skdev->lock, flags);
597 static enum blk_eh_timer_return skd_timed_out(struct request *req,
600 struct skd_device *skdev = req->q->queuedata;
602 dev_err(&skdev->pdev->dev, "request with tag %#x timed out\n",
603 blk_mq_unique_tag(req));
605 return BLK_EH_RESET_TIMER;
608 static void skd_complete_rq(struct request *req)
610 struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
612 blk_mq_end_request(req, skreq->status);
615 static bool skd_preop_sg_list(struct skd_device *skdev,
616 struct skd_request_context *skreq)
618 struct request *req = blk_mq_rq_from_pdu(skreq);
619 struct scatterlist *sgl = &skreq->sg[0], *sg;
623 skreq->sg_byte_count = 0;
625 WARN_ON_ONCE(skreq->data_dir != DMA_TO_DEVICE &&
626 skreq->data_dir != DMA_FROM_DEVICE);
628 n_sg = blk_rq_map_sg(skdev->queue, req, sgl);
633 * Map scatterlist to PCI bus addresses.
634 * Note PCI might change the number of entries.
636 n_sg = pci_map_sg(skdev->pdev, sgl, n_sg, skreq->data_dir);
640 SKD_ASSERT(n_sg <= skdev->sgs_per_request);
644 for_each_sg(sgl, sg, n_sg, i) {
645 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
646 u32 cnt = sg_dma_len(sg);
647 uint64_t dma_addr = sg_dma_address(sg);
649 sgd->control = FIT_SGD_CONTROL_NOT_LAST;
650 sgd->byte_count = cnt;
651 skreq->sg_byte_count += cnt;
652 sgd->host_side_addr = dma_addr;
653 sgd->dev_side_addr = 0;
656 skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
657 skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
659 if (unlikely(skdev->dbg_level > 1)) {
660 dev_dbg(&skdev->pdev->dev,
661 "skreq=%x sksg_list=%p sksg_dma=%llx\n",
662 skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
663 for (i = 0; i < n_sg; i++) {
664 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
666 dev_dbg(&skdev->pdev->dev,
667 " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
668 i, sgd->byte_count, sgd->control,
669 sgd->host_side_addr, sgd->next_desc_ptr);
676 static void skd_postop_sg_list(struct skd_device *skdev,
677 struct skd_request_context *skreq)
680 * restore the next ptr for next IO request so we
681 * don't have to set it every time.
683 skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
684 skreq->sksg_dma_address +
685 ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
686 pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, skreq->data_dir);
690 *****************************************************************************
692 *****************************************************************************
695 static void skd_timer_tick_not_online(struct skd_device *skdev);
697 static void skd_start_queue(struct work_struct *work)
699 struct skd_device *skdev = container_of(work, typeof(*skdev),
703 * Although it is safe to call blk_start_queue() from interrupt
704 * context, blk_mq_start_hw_queues() must not be called from
707 blk_mq_start_hw_queues(skdev->queue);
710 static void skd_timer_tick(ulong arg)
712 struct skd_device *skdev = (struct skd_device *)arg;
713 unsigned long reqflags;
716 if (skdev->state == SKD_DRVR_STATE_FAULT)
717 /* The driver has declared fault, and we want it to
718 * stay that way until driver is reloaded.
722 spin_lock_irqsave(&skdev->lock, reqflags);
724 state = SKD_READL(skdev, FIT_STATUS);
725 state &= FIT_SR_DRIVE_STATE_MASK;
726 if (state != skdev->drive_state)
727 skd_isr_fwstate(skdev);
729 if (skdev->state != SKD_DRVR_STATE_ONLINE)
730 skd_timer_tick_not_online(skdev);
732 mod_timer(&skdev->timer, (jiffies + HZ));
734 spin_unlock_irqrestore(&skdev->lock, reqflags);
737 static void skd_timer_tick_not_online(struct skd_device *skdev)
739 switch (skdev->state) {
740 case SKD_DRVR_STATE_IDLE:
741 case SKD_DRVR_STATE_LOAD:
743 case SKD_DRVR_STATE_BUSY_SANITIZE:
744 dev_dbg(&skdev->pdev->dev,
745 "drive busy sanitize[%x], driver[%x]\n",
746 skdev->drive_state, skdev->state);
747 /* If we've been in sanitize for 3 seconds, we figure we're not
748 * going to get anymore completions, so recover requests now
750 if (skdev->timer_countdown > 0) {
751 skdev->timer_countdown--;
754 skd_recover_requests(skdev);
757 case SKD_DRVR_STATE_BUSY:
758 case SKD_DRVR_STATE_BUSY_IMMINENT:
759 case SKD_DRVR_STATE_BUSY_ERASE:
760 dev_dbg(&skdev->pdev->dev, "busy[%x], countdown=%d\n",
761 skdev->state, skdev->timer_countdown);
762 if (skdev->timer_countdown > 0) {
763 skdev->timer_countdown--;
766 dev_dbg(&skdev->pdev->dev,
767 "busy[%x], timedout=%d, restarting device.",
768 skdev->state, skdev->timer_countdown);
769 skd_restart_device(skdev);
772 case SKD_DRVR_STATE_WAIT_BOOT:
773 case SKD_DRVR_STATE_STARTING:
774 if (skdev->timer_countdown > 0) {
775 skdev->timer_countdown--;
778 /* For now, we fault the drive. Could attempt resets to
779 * revcover at some point. */
780 skdev->state = SKD_DRVR_STATE_FAULT;
782 dev_err(&skdev->pdev->dev, "DriveFault Connect Timeout (%x)\n",
785 /*start the queue so we can respond with error to requests */
786 /* wakeup anyone waiting for startup complete */
787 schedule_work(&skdev->start_queue);
788 skdev->gendisk_on = -1;
789 wake_up_interruptible(&skdev->waitq);
792 case SKD_DRVR_STATE_ONLINE:
793 /* shouldn't get here. */
796 case SKD_DRVR_STATE_PAUSING:
797 case SKD_DRVR_STATE_PAUSED:
800 case SKD_DRVR_STATE_RESTARTING:
801 if (skdev->timer_countdown > 0) {
802 skdev->timer_countdown--;
805 /* For now, we fault the drive. Could attempt resets to
806 * revcover at some point. */
807 skdev->state = SKD_DRVR_STATE_FAULT;
808 dev_err(&skdev->pdev->dev,
809 "DriveFault Reconnect Timeout (%x)\n",
813 * Recovering does two things:
814 * 1. completes IO with error
815 * 2. reclaims dma resources
816 * When is it safe to recover requests?
817 * - if the drive state is faulted
818 * - if the state is still soft reset after out timeout
819 * - if the drive registers are dead (state = FF)
820 * If it is "unsafe", we still need to recover, so we will
821 * disable pci bus mastering and disable our interrupts.
824 if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) ||
825 (skdev->drive_state == FIT_SR_DRIVE_FAULT) ||
826 (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK))
827 /* It never came out of soft reset. Try to
828 * recover the requests and then let them
829 * fail. This is to mitigate hung processes. */
830 skd_recover_requests(skdev);
832 dev_err(&skdev->pdev->dev, "Disable BusMaster (%x)\n",
834 pci_disable_device(skdev->pdev);
835 skd_disable_interrupts(skdev);
836 skd_recover_requests(skdev);
839 /*start the queue so we can respond with error to requests */
840 /* wakeup anyone waiting for startup complete */
841 schedule_work(&skdev->start_queue);
842 skdev->gendisk_on = -1;
843 wake_up_interruptible(&skdev->waitq);
846 case SKD_DRVR_STATE_RESUMING:
847 case SKD_DRVR_STATE_STOPPING:
848 case SKD_DRVR_STATE_SYNCING:
849 case SKD_DRVR_STATE_FAULT:
850 case SKD_DRVR_STATE_DISAPPEARED:
856 static int skd_start_timer(struct skd_device *skdev)
860 setup_timer(&skdev->timer, skd_timer_tick, (ulong)skdev);
862 rc = mod_timer(&skdev->timer, (jiffies + HZ));
864 dev_err(&skdev->pdev->dev, "failed to start timer %d\n", rc);
868 static void skd_kill_timer(struct skd_device *skdev)
870 del_timer_sync(&skdev->timer);
874 *****************************************************************************
875 * INTERNAL REQUESTS -- generated by driver itself
876 *****************************************************************************
879 static int skd_format_internal_skspcl(struct skd_device *skdev)
881 struct skd_special_context *skspcl = &skdev->internal_skspcl;
882 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
883 struct fit_msg_hdr *fmh;
884 uint64_t dma_address;
885 struct skd_scsi_request *scsi;
887 fmh = &skspcl->msg_buf->fmh;
888 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
889 fmh->num_protocol_cmds_coalesced = 1;
891 scsi = &skspcl->msg_buf->scsi[0];
892 memset(scsi, 0, sizeof(*scsi));
893 dma_address = skspcl->req.sksg_dma_address;
894 scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
895 skspcl->req.n_sg = 1;
896 sgd->control = FIT_SGD_CONTROL_LAST;
898 sgd->host_side_addr = skspcl->db_dma_address;
899 sgd->dev_side_addr = 0;
900 sgd->next_desc_ptr = 0LL;
905 #define WR_BUF_SIZE SKD_N_INTERNAL_BYTES
907 static void skd_send_internal_skspcl(struct skd_device *skdev,
908 struct skd_special_context *skspcl,
911 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
912 struct skd_scsi_request *scsi;
913 unsigned char *buf = skspcl->data_buf;
916 if (skspcl->req.state != SKD_REQ_STATE_IDLE)
918 * A refresh is already in progress.
919 * Just wait for it to finish.
923 skspcl->req.state = SKD_REQ_STATE_BUSY;
925 scsi = &skspcl->msg_buf->scsi[0];
926 scsi->hdr.tag = skspcl->req.id;
928 memset(scsi->cdb, 0, sizeof(scsi->cdb));
931 case TEST_UNIT_READY:
932 scsi->cdb[0] = TEST_UNIT_READY;
934 scsi->hdr.sg_list_len_bytes = 0;
938 scsi->cdb[0] = READ_CAPACITY;
939 sgd->byte_count = SKD_N_READ_CAP_BYTES;
940 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
944 scsi->cdb[0] = INQUIRY;
945 scsi->cdb[1] = 0x01; /* evpd */
946 scsi->cdb[2] = 0x80; /* serial number page */
948 sgd->byte_count = 16;
949 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
952 case SYNCHRONIZE_CACHE:
953 scsi->cdb[0] = SYNCHRONIZE_CACHE;
955 scsi->hdr.sg_list_len_bytes = 0;
959 scsi->cdb[0] = WRITE_BUFFER;
961 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
962 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
963 sgd->byte_count = WR_BUF_SIZE;
964 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
965 /* fill incrementing byte pattern */
966 for (i = 0; i < sgd->byte_count; i++)
971 scsi->cdb[0] = READ_BUFFER;
973 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
974 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
975 sgd->byte_count = WR_BUF_SIZE;
976 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
977 memset(skspcl->data_buf, 0, sgd->byte_count);
981 SKD_ASSERT("Don't know what to send");
985 skd_send_special_fitmsg(skdev, skspcl);
988 static void skd_refresh_device_data(struct skd_device *skdev)
990 struct skd_special_context *skspcl = &skdev->internal_skspcl;
992 skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY);
995 static int skd_chk_read_buf(struct skd_device *skdev,
996 struct skd_special_context *skspcl)
998 unsigned char *buf = skspcl->data_buf;
1001 /* check for incrementing byte pattern */
1002 for (i = 0; i < WR_BUF_SIZE; i++)
1003 if (buf[i] != (i & 0xFF))
1009 static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key,
1010 u8 code, u8 qual, u8 fruc)
1012 /* If the check condition is of special interest, log a message */
1013 if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02)
1014 && (code == 0x04) && (qual == 0x06)) {
1015 dev_err(&skdev->pdev->dev,
1016 "*** LOST_WRITE_DATA ERROR *** key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
1017 key, code, qual, fruc);
1021 static void skd_complete_internal(struct skd_device *skdev,
1022 struct fit_completion_entry_v1 *skcomp,
1023 struct fit_comp_error_info *skerr,
1024 struct skd_special_context *skspcl)
1026 u8 *buf = skspcl->data_buf;
1029 struct skd_scsi_request *scsi = &skspcl->msg_buf->scsi[0];
1031 lockdep_assert_held(&skdev->lock);
1033 SKD_ASSERT(skspcl == &skdev->internal_skspcl);
1035 dev_dbg(&skdev->pdev->dev, "complete internal %x\n", scsi->cdb[0]);
1037 dma_sync_single_for_cpu(&skdev->pdev->dev,
1038 skspcl->db_dma_address,
1039 skspcl->req.sksg_list[0].byte_count,
1042 skspcl->req.completion = *skcomp;
1043 skspcl->req.state = SKD_REQ_STATE_IDLE;
1045 status = skspcl->req.completion.status;
1047 skd_log_check_status(skdev, status, skerr->key, skerr->code,
1048 skerr->qual, skerr->fruc);
1050 switch (scsi->cdb[0]) {
1051 case TEST_UNIT_READY:
1052 if (status == SAM_STAT_GOOD)
1053 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
1054 else if ((status == SAM_STAT_CHECK_CONDITION) &&
1055 (skerr->key == MEDIUM_ERROR))
1056 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
1058 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1059 dev_dbg(&skdev->pdev->dev,
1060 "TUR failed, don't send anymore state 0x%x\n",
1064 dev_dbg(&skdev->pdev->dev,
1065 "**** TUR failed, retry skerr\n");
1066 skd_send_internal_skspcl(skdev, skspcl,
1072 if (status == SAM_STAT_GOOD)
1073 skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER);
1075 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1076 dev_dbg(&skdev->pdev->dev,
1077 "write buffer failed, don't send anymore state 0x%x\n",
1081 dev_dbg(&skdev->pdev->dev,
1082 "**** write buffer failed, retry skerr\n");
1083 skd_send_internal_skspcl(skdev, skspcl,
1089 if (status == SAM_STAT_GOOD) {
1090 if (skd_chk_read_buf(skdev, skspcl) == 0)
1091 skd_send_internal_skspcl(skdev, skspcl,
1094 dev_err(&skdev->pdev->dev,
1095 "*** W/R Buffer mismatch %d ***\n",
1096 skdev->connect_retries);
1097 if (skdev->connect_retries <
1098 SKD_MAX_CONNECT_RETRIES) {
1099 skdev->connect_retries++;
1100 skd_soft_reset(skdev);
1102 dev_err(&skdev->pdev->dev,
1103 "W/R Buffer Connect Error\n");
1109 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
1110 dev_dbg(&skdev->pdev->dev,
1111 "read buffer failed, don't send anymore state 0x%x\n",
1115 dev_dbg(&skdev->pdev->dev,
1116 "**** read buffer failed, retry skerr\n");
1117 skd_send_internal_skspcl(skdev, skspcl,
1123 skdev->read_cap_is_valid = 0;
1124 if (status == SAM_STAT_GOOD) {
1125 skdev->read_cap_last_lba =
1126 (buf[0] << 24) | (buf[1] << 16) |
1127 (buf[2] << 8) | buf[3];
1128 skdev->read_cap_blocksize =
1129 (buf[4] << 24) | (buf[5] << 16) |
1130 (buf[6] << 8) | buf[7];
1132 dev_dbg(&skdev->pdev->dev, "last lba %d, bs %d\n",
1133 skdev->read_cap_last_lba,
1134 skdev->read_cap_blocksize);
1136 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
1138 skdev->read_cap_is_valid = 1;
1140 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
1141 } else if ((status == SAM_STAT_CHECK_CONDITION) &&
1142 (skerr->key == MEDIUM_ERROR)) {
1143 skdev->read_cap_last_lba = ~0;
1144 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
1145 dev_dbg(&skdev->pdev->dev, "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n");
1146 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
1148 dev_dbg(&skdev->pdev->dev, "**** READCAP failed, retry TUR\n");
1149 skd_send_internal_skspcl(skdev, skspcl,
1155 skdev->inquiry_is_valid = 0;
1156 if (status == SAM_STAT_GOOD) {
1157 skdev->inquiry_is_valid = 1;
1159 for (i = 0; i < 12; i++)
1160 skdev->inq_serial_num[i] = buf[i + 4];
1161 skdev->inq_serial_num[12] = 0;
1164 if (skd_unquiesce_dev(skdev) < 0)
1165 dev_dbg(&skdev->pdev->dev, "**** failed, to ONLINE device\n");
1166 /* connection is complete */
1167 skdev->connect_retries = 0;
1170 case SYNCHRONIZE_CACHE:
1171 if (status == SAM_STAT_GOOD)
1172 skdev->sync_done = 1;
1174 skdev->sync_done = -1;
1175 wake_up_interruptible(&skdev->waitq);
1179 SKD_ASSERT("we didn't send this");
1184 *****************************************************************************
1186 *****************************************************************************
1189 static void skd_send_fitmsg(struct skd_device *skdev,
1190 struct skd_fitmsg_context *skmsg)
1194 dev_dbg(&skdev->pdev->dev, "dma address 0x%llx, busy=%d\n",
1195 skmsg->mb_dma_address, skd_in_flight(skdev));
1196 dev_dbg(&skdev->pdev->dev, "msg_buf %p\n", skmsg->msg_buf);
1198 qcmd = skmsg->mb_dma_address;
1199 qcmd |= FIT_QCMD_QID_NORMAL;
1201 if (unlikely(skdev->dbg_level > 1)) {
1202 u8 *bp = (u8 *)skmsg->msg_buf;
1204 for (i = 0; i < skmsg->length; i += 8) {
1205 dev_dbg(&skdev->pdev->dev, "msg[%2d] %8ph\n", i,
1212 if (skmsg->length > 256)
1213 qcmd |= FIT_QCMD_MSGSIZE_512;
1214 else if (skmsg->length > 128)
1215 qcmd |= FIT_QCMD_MSGSIZE_256;
1216 else if (skmsg->length > 64)
1217 qcmd |= FIT_QCMD_MSGSIZE_128;
1220 * This makes no sense because the FIT msg header is
1221 * 64 bytes. If the msg is only 64 bytes long it has
1224 qcmd |= FIT_QCMD_MSGSIZE_64;
1226 dma_sync_single_for_device(&skdev->pdev->dev, skmsg->mb_dma_address,
1227 skmsg->length, DMA_TO_DEVICE);
1229 /* Make sure skd_msg_buf is written before the doorbell is triggered. */
1232 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
1235 static void skd_send_special_fitmsg(struct skd_device *skdev,
1236 struct skd_special_context *skspcl)
1240 WARN_ON_ONCE(skspcl->req.n_sg != 1);
1242 if (unlikely(skdev->dbg_level > 1)) {
1243 u8 *bp = (u8 *)skspcl->msg_buf;
1246 for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) {
1247 dev_dbg(&skdev->pdev->dev, " spcl[%2d] %8ph\n", i,
1253 dev_dbg(&skdev->pdev->dev,
1254 "skspcl=%p id=%04x sksg_list=%p sksg_dma=%llx\n",
1255 skspcl, skspcl->req.id, skspcl->req.sksg_list,
1256 skspcl->req.sksg_dma_address);
1257 for (i = 0; i < skspcl->req.n_sg; i++) {
1258 struct fit_sg_descriptor *sgd =
1259 &skspcl->req.sksg_list[i];
1261 dev_dbg(&skdev->pdev->dev,
1262 " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
1263 i, sgd->byte_count, sgd->control,
1264 sgd->host_side_addr, sgd->next_desc_ptr);
1269 * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr
1270 * and one 64-byte SSDI command.
1272 qcmd = skspcl->mb_dma_address;
1273 qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
1275 dma_sync_single_for_device(&skdev->pdev->dev, skspcl->mb_dma_address,
1276 SKD_N_SPECIAL_FITMSG_BYTES, DMA_TO_DEVICE);
1277 dma_sync_single_for_device(&skdev->pdev->dev,
1278 skspcl->req.sksg_dma_address,
1279 1 * sizeof(struct fit_sg_descriptor),
1281 dma_sync_single_for_device(&skdev->pdev->dev,
1282 skspcl->db_dma_address,
1283 skspcl->req.sksg_list[0].byte_count,
1286 /* Make sure skd_msg_buf is written before the doorbell is triggered. */
1289 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
1293 *****************************************************************************
1295 *****************************************************************************
1298 static void skd_complete_other(struct skd_device *skdev,
1299 struct fit_completion_entry_v1 *skcomp,
1300 struct fit_comp_error_info *skerr);
1309 enum skd_check_status_action action;
1312 static struct sns_info skd_chkstat_table[] = {
1314 { 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c,
1315 SKD_CHECK_STATUS_REPORT_GOOD },
1318 { 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */
1319 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1320 { 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */
1321 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1322 { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */
1323 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
1325 /* Retry (with limits) */
1326 { 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */
1327 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1328 { 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */
1329 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1330 { 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */
1331 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1332 { 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */
1333 SKD_CHECK_STATUS_REQUEUE_REQUEST },
1335 /* Busy (or about to be) */
1336 { 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */
1337 SKD_CHECK_STATUS_BUSY_IMMINENT },
1341 * Look up status and sense data to decide how to handle the error
1343 * mask says which fields must match e.g., mask=0x18 means check
1344 * type and stat, ignore key, asc, ascq.
1347 static enum skd_check_status_action
1348 skd_check_status(struct skd_device *skdev,
1349 u8 cmp_status, struct fit_comp_error_info *skerr)
1353 dev_err(&skdev->pdev->dev, "key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
1354 skerr->key, skerr->code, skerr->qual, skerr->fruc);
1356 dev_dbg(&skdev->pdev->dev,
1357 "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x fruc=%02x\n",
1358 skerr->type, cmp_status, skerr->key, skerr->code, skerr->qual,
1361 /* Does the info match an entry in the good category? */
1362 for (i = 0; i < ARRAY_SIZE(skd_chkstat_table); i++) {
1363 struct sns_info *sns = &skd_chkstat_table[i];
1365 if (sns->mask & 0x10)
1366 if (skerr->type != sns->type)
1369 if (sns->mask & 0x08)
1370 if (cmp_status != sns->stat)
1373 if (sns->mask & 0x04)
1374 if (skerr->key != sns->key)
1377 if (sns->mask & 0x02)
1378 if (skerr->code != sns->asc)
1381 if (sns->mask & 0x01)
1382 if (skerr->qual != sns->ascq)
1385 if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) {
1386 dev_err(&skdev->pdev->dev,
1387 "SMART Alert: sense key/asc/ascq %02x/%02x/%02x\n",
1388 skerr->key, skerr->code, skerr->qual);
1393 /* No other match, so nonzero status means error,
1394 * zero status means good
1397 dev_dbg(&skdev->pdev->dev, "status check: error\n");
1398 return SKD_CHECK_STATUS_REPORT_ERROR;
1401 dev_dbg(&skdev->pdev->dev, "status check good default\n");
1402 return SKD_CHECK_STATUS_REPORT_GOOD;
1405 static void skd_resolve_req_exception(struct skd_device *skdev,
1406 struct skd_request_context *skreq,
1407 struct request *req)
1409 u8 cmp_status = skreq->completion.status;
1411 switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) {
1412 case SKD_CHECK_STATUS_REPORT_GOOD:
1413 case SKD_CHECK_STATUS_REPORT_SMART_ALERT:
1414 skreq->status = BLK_STS_OK;
1415 blk_mq_complete_request(req);
1418 case SKD_CHECK_STATUS_BUSY_IMMINENT:
1419 skd_log_skreq(skdev, skreq, "retry(busy)");
1420 blk_requeue_request(skdev->queue, req);
1421 dev_info(&skdev->pdev->dev, "drive BUSY imminent\n");
1422 skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT;
1423 skdev->timer_countdown = SKD_TIMER_MINUTES(20);
1424 skd_quiesce_dev(skdev);
1427 case SKD_CHECK_STATUS_REQUEUE_REQUEST:
1428 if ((unsigned long) ++req->special < SKD_MAX_RETRIES) {
1429 skd_log_skreq(skdev, skreq, "retry");
1430 blk_requeue_request(skdev->queue, req);
1435 case SKD_CHECK_STATUS_REPORT_ERROR:
1437 skreq->status = BLK_STS_IOERR;
1438 blk_mq_complete_request(req);
1443 static void skd_release_skreq(struct skd_device *skdev,
1444 struct skd_request_context *skreq)
1447 * Reclaim the skd_request_context
1449 skreq->state = SKD_REQ_STATE_IDLE;
1452 static int skd_isr_completion_posted(struct skd_device *skdev,
1453 int limit, int *enqueued)
1455 struct fit_completion_entry_v1 *skcmp;
1456 struct fit_comp_error_info *skerr;
1461 struct skd_request_context *skreq;
1469 lockdep_assert_held(&skdev->lock);
1472 SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY);
1474 skcmp = &skdev->skcomp_table[skdev->skcomp_ix];
1475 cmp_cycle = skcmp->cycle;
1476 cmp_cntxt = skcmp->tag;
1477 cmp_status = skcmp->status;
1478 cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes);
1480 skerr = &skdev->skerr_table[skdev->skcomp_ix];
1482 dev_dbg(&skdev->pdev->dev,
1483 "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d busy=%d rbytes=0x%x proto=%d\n",
1484 skdev->skcomp_cycle, skdev->skcomp_ix, cmp_cycle,
1485 cmp_cntxt, cmp_status, skd_in_flight(skdev),
1486 cmp_bytes, skdev->proto_ver);
1488 if (cmp_cycle != skdev->skcomp_cycle) {
1489 dev_dbg(&skdev->pdev->dev, "end of completions\n");
1493 * Update the completion queue head index and possibly
1494 * the completion cycle count. 8-bit wrap-around.
1497 if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) {
1498 skdev->skcomp_ix = 0;
1499 skdev->skcomp_cycle++;
1503 * The command context is a unique 32-bit ID. The low order
1504 * bits help locate the request. The request is usually a
1505 * r/w request (see skd_start() above) or a special request.
1508 tag = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
1510 /* Is this other than a r/w request? */
1511 if (tag >= skdev->num_req_context) {
1513 * This is not a completion for a r/w request.
1515 WARN_ON_ONCE(blk_mq_tag_to_rq(skdev->tag_set.tags[hwq],
1517 skd_complete_other(skdev, skcmp, skerr);
1521 rq = blk_mq_tag_to_rq(skdev->tag_set.tags[hwq], tag);
1522 if (WARN(!rq, "No request for tag %#x -> %#x\n", cmp_cntxt,
1525 skreq = blk_mq_rq_to_pdu(rq);
1528 * Make sure the request ID for the slot matches.
1530 if (skreq->id != req_id) {
1531 dev_err(&skdev->pdev->dev,
1532 "Completion mismatch comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
1533 req_id, skreq->id, cmp_cntxt);
1538 SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
1540 skreq->completion = *skcmp;
1541 if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) {
1542 skreq->err_info = *skerr;
1543 skd_log_check_status(skdev, cmp_status, skerr->key,
1544 skerr->code, skerr->qual,
1547 /* Release DMA resources for the request. */
1548 if (skreq->n_sg > 0)
1549 skd_postop_sg_list(skdev, skreq);
1551 skd_release_skreq(skdev, skreq);
1554 * Capture the outcome and post it back to the native request.
1556 if (likely(cmp_status == SAM_STAT_GOOD)) {
1557 skreq->status = BLK_STS_OK;
1558 blk_mq_complete_request(rq);
1560 skd_resolve_req_exception(skdev, skreq, rq);
1563 /* skd_isr_comp_limit equal zero means no limit */
1565 if (++processed >= limit) {
1572 if (skdev->state == SKD_DRVR_STATE_PAUSING &&
1573 skd_in_flight(skdev) == 0) {
1574 skdev->state = SKD_DRVR_STATE_PAUSED;
1575 wake_up_interruptible(&skdev->waitq);
1581 static void skd_complete_other(struct skd_device *skdev,
1582 struct fit_completion_entry_v1 *skcomp,
1583 struct fit_comp_error_info *skerr)
1588 struct skd_special_context *skspcl;
1590 lockdep_assert_held(&skdev->lock);
1592 req_id = skcomp->tag;
1593 req_table = req_id & SKD_ID_TABLE_MASK;
1594 req_slot = req_id & SKD_ID_SLOT_MASK;
1596 dev_dbg(&skdev->pdev->dev, "table=0x%x id=0x%x slot=%d\n", req_table,
1600 * Based on the request id, determine how to dispatch this completion.
1601 * This swich/case is finding the good cases and forwarding the
1602 * completion entry. Errors are reported below the switch.
1604 switch (req_table) {
1605 case SKD_ID_RW_REQUEST:
1607 * The caller, skd_isr_completion_posted() above,
1608 * handles r/w requests. The only way we get here
1609 * is if the req_slot is out of bounds.
1613 case SKD_ID_INTERNAL:
1614 if (req_slot == 0) {
1615 skspcl = &skdev->internal_skspcl;
1616 if (skspcl->req.id == req_id &&
1617 skspcl->req.state == SKD_REQ_STATE_BUSY) {
1618 skd_complete_internal(skdev,
1619 skcomp, skerr, skspcl);
1625 case SKD_ID_FIT_MSG:
1627 * These id's should never appear in a completion record.
1633 * These id's should never appear anywhere;
1639 * If we get here it is a bad or stale id.
1643 static void skd_reset_skcomp(struct skd_device *skdev)
1645 memset(skdev->skcomp_table, 0, SKD_SKCOMP_SIZE);
1647 skdev->skcomp_ix = 0;
1648 skdev->skcomp_cycle = 1;
1652 *****************************************************************************
1654 *****************************************************************************
1656 static void skd_completion_worker(struct work_struct *work)
1658 struct skd_device *skdev =
1659 container_of(work, struct skd_device, completion_worker);
1660 unsigned long flags;
1661 int flush_enqueued = 0;
1663 spin_lock_irqsave(&skdev->lock, flags);
1666 * pass in limit=0, which means no limit..
1667 * process everything in compq
1669 skd_isr_completion_posted(skdev, 0, &flush_enqueued);
1670 schedule_work(&skdev->start_queue);
1672 spin_unlock_irqrestore(&skdev->lock, flags);
1675 static void skd_isr_msg_from_dev(struct skd_device *skdev);
1678 skd_isr(int irq, void *ptr)
1680 struct skd_device *skdev = ptr;
1685 int flush_enqueued = 0;
1687 spin_lock(&skdev->lock);
1690 intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
1692 ack = FIT_INT_DEF_MASK;
1695 dev_dbg(&skdev->pdev->dev, "intstat=0x%x ack=0x%x\n", intstat,
1698 /* As long as there is an int pending on device, keep
1699 * running loop. When none, get out, but if we've never
1700 * done any processing, call completion handler?
1703 /* No interrupts on device, but run the completion
1707 if (likely (skdev->state
1708 == SKD_DRVR_STATE_ONLINE))
1715 SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST);
1717 if (likely((skdev->state != SKD_DRVR_STATE_LOAD) &&
1718 (skdev->state != SKD_DRVR_STATE_STOPPING))) {
1719 if (intstat & FIT_ISH_COMPLETION_POSTED) {
1721 * If we have already deferred completion
1722 * processing, don't bother running it again
1726 skd_isr_completion_posted(skdev,
1727 skd_isr_comp_limit, &flush_enqueued);
1730 if (intstat & FIT_ISH_FW_STATE_CHANGE) {
1731 skd_isr_fwstate(skdev);
1732 if (skdev->state == SKD_DRVR_STATE_FAULT ||
1734 SKD_DRVR_STATE_DISAPPEARED) {
1735 spin_unlock(&skdev->lock);
1740 if (intstat & FIT_ISH_MSG_FROM_DEV)
1741 skd_isr_msg_from_dev(skdev);
1745 if (unlikely(flush_enqueued))
1746 schedule_work(&skdev->start_queue);
1749 schedule_work(&skdev->completion_worker);
1750 else if (!flush_enqueued)
1751 schedule_work(&skdev->start_queue);
1753 spin_unlock(&skdev->lock);
1758 static void skd_drive_fault(struct skd_device *skdev)
1760 skdev->state = SKD_DRVR_STATE_FAULT;
1761 dev_err(&skdev->pdev->dev, "Drive FAULT\n");
1764 static void skd_drive_disappeared(struct skd_device *skdev)
1766 skdev->state = SKD_DRVR_STATE_DISAPPEARED;
1767 dev_err(&skdev->pdev->dev, "Drive DISAPPEARED\n");
1770 static void skd_isr_fwstate(struct skd_device *skdev)
1775 int prev_driver_state = skdev->state;
1777 sense = SKD_READL(skdev, FIT_STATUS);
1778 state = sense & FIT_SR_DRIVE_STATE_MASK;
1780 dev_err(&skdev->pdev->dev, "s1120 state %s(%d)=>%s(%d)\n",
1781 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
1782 skd_drive_state_to_str(state), state);
1784 skdev->drive_state = state;
1786 switch (skdev->drive_state) {
1787 case FIT_SR_DRIVE_INIT:
1788 if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) {
1789 skd_disable_interrupts(skdev);
1792 if (skdev->state == SKD_DRVR_STATE_RESTARTING)
1793 skd_recover_requests(skdev);
1794 if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) {
1795 skdev->timer_countdown = SKD_STARTING_TIMO;
1796 skdev->state = SKD_DRVR_STATE_STARTING;
1797 skd_soft_reset(skdev);
1800 mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0);
1801 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1802 skdev->last_mtd = mtd;
1805 case FIT_SR_DRIVE_ONLINE:
1806 skdev->cur_max_queue_depth = skd_max_queue_depth;
1807 if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth)
1808 skdev->cur_max_queue_depth = skdev->dev_max_queue_depth;
1810 skdev->queue_low_water_mark =
1811 skdev->cur_max_queue_depth * 2 / 3 + 1;
1812 if (skdev->queue_low_water_mark < 1)
1813 skdev->queue_low_water_mark = 1;
1814 dev_info(&skdev->pdev->dev,
1815 "Queue depth limit=%d dev=%d lowat=%d\n",
1816 skdev->cur_max_queue_depth,
1817 skdev->dev_max_queue_depth,
1818 skdev->queue_low_water_mark);
1820 skd_refresh_device_data(skdev);
1823 case FIT_SR_DRIVE_BUSY:
1824 skdev->state = SKD_DRVR_STATE_BUSY;
1825 skdev->timer_countdown = SKD_BUSY_TIMO;
1826 skd_quiesce_dev(skdev);
1828 case FIT_SR_DRIVE_BUSY_SANITIZE:
1829 /* set timer for 3 seconds, we'll abort any unfinished
1830 * commands after that expires
1832 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
1833 skdev->timer_countdown = SKD_TIMER_SECONDS(3);
1834 schedule_work(&skdev->start_queue);
1836 case FIT_SR_DRIVE_BUSY_ERASE:
1837 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
1838 skdev->timer_countdown = SKD_BUSY_TIMO;
1840 case FIT_SR_DRIVE_OFFLINE:
1841 skdev->state = SKD_DRVR_STATE_IDLE;
1843 case FIT_SR_DRIVE_SOFT_RESET:
1844 switch (skdev->state) {
1845 case SKD_DRVR_STATE_STARTING:
1846 case SKD_DRVR_STATE_RESTARTING:
1847 /* Expected by a caller of skd_soft_reset() */
1850 skdev->state = SKD_DRVR_STATE_RESTARTING;
1854 case FIT_SR_DRIVE_FW_BOOTING:
1855 dev_dbg(&skdev->pdev->dev, "ISR FIT_SR_DRIVE_FW_BOOTING\n");
1856 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
1857 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
1860 case FIT_SR_DRIVE_DEGRADED:
1861 case FIT_SR_PCIE_LINK_DOWN:
1862 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
1865 case FIT_SR_DRIVE_FAULT:
1866 skd_drive_fault(skdev);
1867 skd_recover_requests(skdev);
1868 schedule_work(&skdev->start_queue);
1871 /* PCIe bus returned all Fs? */
1873 dev_info(&skdev->pdev->dev, "state=0x%x sense=0x%x\n", state,
1875 skd_drive_disappeared(skdev);
1876 skd_recover_requests(skdev);
1877 schedule_work(&skdev->start_queue);
1881 * Uknown FW State. Wait for a state we recognize.
1885 dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
1886 skd_skdev_state_to_str(prev_driver_state), prev_driver_state,
1887 skd_skdev_state_to_str(skdev->state), skdev->state);
1890 static void skd_recover_request(struct request *req, void *data, bool reserved)
1892 struct skd_device *const skdev = data;
1893 struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
1895 if (skreq->state != SKD_REQ_STATE_BUSY)
1898 skd_log_skreq(skdev, skreq, "recover");
1900 /* Release DMA resources for the request. */
1901 if (skreq->n_sg > 0)
1902 skd_postop_sg_list(skdev, skreq);
1904 skreq->state = SKD_REQ_STATE_IDLE;
1905 skreq->status = BLK_STS_IOERR;
1906 blk_mq_complete_request(req);
1909 static void skd_recover_requests(struct skd_device *skdev)
1911 blk_mq_tagset_busy_iter(&skdev->tag_set, skd_recover_request, skdev);
1914 static void skd_isr_msg_from_dev(struct skd_device *skdev)
1920 mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
1922 dev_dbg(&skdev->pdev->dev, "mfd=0x%x last_mtd=0x%x\n", mfd,
1925 /* ignore any mtd that is an ack for something we didn't send */
1926 if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd))
1929 switch (FIT_MXD_TYPE(mfd)) {
1930 case FIT_MTD_FITFW_INIT:
1931 skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd);
1933 if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) {
1934 dev_err(&skdev->pdev->dev, "protocol mismatch\n");
1935 dev_err(&skdev->pdev->dev, " got=%d support=%d\n",
1936 skdev->proto_ver, FIT_PROTOCOL_VERSION_1);
1937 dev_err(&skdev->pdev->dev, " please upgrade driver\n");
1938 skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH;
1939 skd_soft_reset(skdev);
1942 mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0);
1943 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1944 skdev->last_mtd = mtd;
1947 case FIT_MTD_GET_CMDQ_DEPTH:
1948 skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd);
1949 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0,
1950 SKD_N_COMPLETION_ENTRY);
1951 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1952 skdev->last_mtd = mtd;
1955 case FIT_MTD_SET_COMPQ_DEPTH:
1956 SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG);
1957 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0);
1958 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1959 skdev->last_mtd = mtd;
1962 case FIT_MTD_SET_COMPQ_ADDR:
1963 skd_reset_skcomp(skdev);
1964 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno);
1965 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1966 skdev->last_mtd = mtd;
1969 case FIT_MTD_CMD_LOG_HOST_ID:
1970 skdev->connect_time_stamp = get_seconds();
1971 data = skdev->connect_time_stamp & 0xFFFF;
1972 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data);
1973 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1974 skdev->last_mtd = mtd;
1977 case FIT_MTD_CMD_LOG_TIME_STAMP_LO:
1978 skdev->drive_jiffies = FIT_MXD_DATA(mfd);
1979 data = (skdev->connect_time_stamp >> 16) & 0xFFFF;
1980 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data);
1981 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1982 skdev->last_mtd = mtd;
1985 case FIT_MTD_CMD_LOG_TIME_STAMP_HI:
1986 skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16);
1987 mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0);
1988 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
1989 skdev->last_mtd = mtd;
1991 dev_err(&skdev->pdev->dev, "Time sync driver=0x%x device=0x%x\n",
1992 skdev->connect_time_stamp, skdev->drive_jiffies);
1995 case FIT_MTD_ARM_QUEUE:
1996 skdev->last_mtd = 0;
1998 * State should be, or soon will be, FIT_SR_DRIVE_ONLINE.
2007 static void skd_disable_interrupts(struct skd_device *skdev)
2011 sense = SKD_READL(skdev, FIT_CONTROL);
2012 sense &= ~FIT_CR_ENABLE_INTERRUPTS;
2013 SKD_WRITEL(skdev, sense, FIT_CONTROL);
2014 dev_dbg(&skdev->pdev->dev, "sense 0x%x\n", sense);
2016 /* Note that the 1s is written. A 1-bit means
2017 * disable, a 0 means enable.
2019 SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST);
2022 static void skd_enable_interrupts(struct skd_device *skdev)
2026 /* unmask interrupts first */
2027 val = FIT_ISH_FW_STATE_CHANGE +
2028 FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV;
2030 /* Note that the compliment of mask is written. A 1-bit means
2031 * disable, a 0 means enable. */
2032 SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST);
2033 dev_dbg(&skdev->pdev->dev, "interrupt mask=0x%x\n", ~val);
2035 val = SKD_READL(skdev, FIT_CONTROL);
2036 val |= FIT_CR_ENABLE_INTERRUPTS;
2037 dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
2038 SKD_WRITEL(skdev, val, FIT_CONTROL);
2042 *****************************************************************************
2043 * START, STOP, RESTART, QUIESCE, UNQUIESCE
2044 *****************************************************************************
2047 static void skd_soft_reset(struct skd_device *skdev)
2051 val = SKD_READL(skdev, FIT_CONTROL);
2052 val |= (FIT_CR_SOFT_RESET);
2053 dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
2054 SKD_WRITEL(skdev, val, FIT_CONTROL);
2057 static void skd_start_device(struct skd_device *skdev)
2059 unsigned long flags;
2063 spin_lock_irqsave(&skdev->lock, flags);
2065 /* ack all ghost interrupts */
2066 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2068 sense = SKD_READL(skdev, FIT_STATUS);
2070 dev_dbg(&skdev->pdev->dev, "initial status=0x%x\n", sense);
2072 state = sense & FIT_SR_DRIVE_STATE_MASK;
2073 skdev->drive_state = state;
2074 skdev->last_mtd = 0;
2076 skdev->state = SKD_DRVR_STATE_STARTING;
2077 skdev->timer_countdown = SKD_STARTING_TIMO;
2079 skd_enable_interrupts(skdev);
2081 switch (skdev->drive_state) {
2082 case FIT_SR_DRIVE_OFFLINE:
2083 dev_err(&skdev->pdev->dev, "Drive offline...\n");
2086 case FIT_SR_DRIVE_FW_BOOTING:
2087 dev_dbg(&skdev->pdev->dev, "FIT_SR_DRIVE_FW_BOOTING\n");
2088 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
2089 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
2092 case FIT_SR_DRIVE_BUSY_SANITIZE:
2093 dev_info(&skdev->pdev->dev, "Start: BUSY_SANITIZE\n");
2094 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
2095 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2098 case FIT_SR_DRIVE_BUSY_ERASE:
2099 dev_info(&skdev->pdev->dev, "Start: BUSY_ERASE\n");
2100 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
2101 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2104 case FIT_SR_DRIVE_INIT:
2105 case FIT_SR_DRIVE_ONLINE:
2106 skd_soft_reset(skdev);
2109 case FIT_SR_DRIVE_BUSY:
2110 dev_err(&skdev->pdev->dev, "Drive Busy...\n");
2111 skdev->state = SKD_DRVR_STATE_BUSY;
2112 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
2115 case FIT_SR_DRIVE_SOFT_RESET:
2116 dev_err(&skdev->pdev->dev, "drive soft reset in prog\n");
2119 case FIT_SR_DRIVE_FAULT:
2120 /* Fault state is bad...soft reset won't do it...
2121 * Hard reset, maybe, but does it work on device?
2122 * For now, just fault so the system doesn't hang.
2124 skd_drive_fault(skdev);
2125 /*start the queue so we can respond with error to requests */
2126 dev_dbg(&skdev->pdev->dev, "starting queue\n");
2127 schedule_work(&skdev->start_queue);
2128 skdev->gendisk_on = -1;
2129 wake_up_interruptible(&skdev->waitq);
2133 /* Most likely the device isn't there or isn't responding
2134 * to the BAR1 addresses. */
2135 skd_drive_disappeared(skdev);
2136 /*start the queue so we can respond with error to requests */
2137 dev_dbg(&skdev->pdev->dev,
2138 "starting queue to error-out reqs\n");
2139 schedule_work(&skdev->start_queue);
2140 skdev->gendisk_on = -1;
2141 wake_up_interruptible(&skdev->waitq);
2145 dev_err(&skdev->pdev->dev, "Start: unknown state %x\n",
2146 skdev->drive_state);
2150 state = SKD_READL(skdev, FIT_CONTROL);
2151 dev_dbg(&skdev->pdev->dev, "FIT Control Status=0x%x\n", state);
2153 state = SKD_READL(skdev, FIT_INT_STATUS_HOST);
2154 dev_dbg(&skdev->pdev->dev, "Intr Status=0x%x\n", state);
2156 state = SKD_READL(skdev, FIT_INT_MASK_HOST);
2157 dev_dbg(&skdev->pdev->dev, "Intr Mask=0x%x\n", state);
2159 state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
2160 dev_dbg(&skdev->pdev->dev, "Msg from Dev=0x%x\n", state);
2162 state = SKD_READL(skdev, FIT_HW_VERSION);
2163 dev_dbg(&skdev->pdev->dev, "HW version=0x%x\n", state);
2165 spin_unlock_irqrestore(&skdev->lock, flags);
2168 static void skd_stop_device(struct skd_device *skdev)
2170 unsigned long flags;
2171 struct skd_special_context *skspcl = &skdev->internal_skspcl;
2175 spin_lock_irqsave(&skdev->lock, flags);
2177 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
2178 dev_err(&skdev->pdev->dev, "%s not online no sync\n", __func__);
2182 if (skspcl->req.state != SKD_REQ_STATE_IDLE) {
2183 dev_err(&skdev->pdev->dev, "%s no special\n", __func__);
2187 skdev->state = SKD_DRVR_STATE_SYNCING;
2188 skdev->sync_done = 0;
2190 skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE);
2192 spin_unlock_irqrestore(&skdev->lock, flags);
2194 wait_event_interruptible_timeout(skdev->waitq,
2195 (skdev->sync_done), (10 * HZ));
2197 spin_lock_irqsave(&skdev->lock, flags);
2199 switch (skdev->sync_done) {
2201 dev_err(&skdev->pdev->dev, "%s no sync\n", __func__);
2204 dev_err(&skdev->pdev->dev, "%s sync done\n", __func__);
2207 dev_err(&skdev->pdev->dev, "%s sync error\n", __func__);
2211 skdev->state = SKD_DRVR_STATE_STOPPING;
2212 spin_unlock_irqrestore(&skdev->lock, flags);
2214 skd_kill_timer(skdev);
2216 spin_lock_irqsave(&skdev->lock, flags);
2217 skd_disable_interrupts(skdev);
2219 /* ensure all ints on device are cleared */
2220 /* soft reset the device to unload with a clean slate */
2221 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2222 SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL);
2224 spin_unlock_irqrestore(&skdev->lock, flags);
2226 /* poll every 100ms, 1 second timeout */
2227 for (i = 0; i < 10; i++) {
2229 SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK;
2230 if (dev_state == FIT_SR_DRIVE_INIT)
2232 set_current_state(TASK_INTERRUPTIBLE);
2233 schedule_timeout(msecs_to_jiffies(100));
2236 if (dev_state != FIT_SR_DRIVE_INIT)
2237 dev_err(&skdev->pdev->dev, "%s state error 0x%02x\n", __func__,
2241 /* assume spinlock is held */
2242 static void skd_restart_device(struct skd_device *skdev)
2246 /* ack all ghost interrupts */
2247 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
2249 state = SKD_READL(skdev, FIT_STATUS);
2251 dev_dbg(&skdev->pdev->dev, "drive status=0x%x\n", state);
2253 state &= FIT_SR_DRIVE_STATE_MASK;
2254 skdev->drive_state = state;
2255 skdev->last_mtd = 0;
2257 skdev->state = SKD_DRVR_STATE_RESTARTING;
2258 skdev->timer_countdown = SKD_RESTARTING_TIMO;
2260 skd_soft_reset(skdev);
2263 /* assume spinlock is held */
2264 static int skd_quiesce_dev(struct skd_device *skdev)
2268 switch (skdev->state) {
2269 case SKD_DRVR_STATE_BUSY:
2270 case SKD_DRVR_STATE_BUSY_IMMINENT:
2271 dev_dbg(&skdev->pdev->dev, "stopping queue\n");
2272 blk_mq_stop_hw_queues(skdev->queue);
2274 case SKD_DRVR_STATE_ONLINE:
2275 case SKD_DRVR_STATE_STOPPING:
2276 case SKD_DRVR_STATE_SYNCING:
2277 case SKD_DRVR_STATE_PAUSING:
2278 case SKD_DRVR_STATE_PAUSED:
2279 case SKD_DRVR_STATE_STARTING:
2280 case SKD_DRVR_STATE_RESTARTING:
2281 case SKD_DRVR_STATE_RESUMING:
2284 dev_dbg(&skdev->pdev->dev, "state [%d] not implemented\n",
2290 /* assume spinlock is held */
2291 static int skd_unquiesce_dev(struct skd_device *skdev)
2293 int prev_driver_state = skdev->state;
2295 skd_log_skdev(skdev, "unquiesce");
2296 if (skdev->state == SKD_DRVR_STATE_ONLINE) {
2297 dev_dbg(&skdev->pdev->dev, "**** device already ONLINE\n");
2300 if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) {
2302 * If there has been an state change to other than
2303 * ONLINE, we will rely on controller state change
2304 * to come back online and restart the queue.
2305 * The BUSY state means that driver is ready to
2306 * continue normal processing but waiting for controller
2307 * to become available.
2309 skdev->state = SKD_DRVR_STATE_BUSY;
2310 dev_dbg(&skdev->pdev->dev, "drive BUSY state\n");
2315 * Drive has just come online, driver is either in startup,
2316 * paused performing a task, or bust waiting for hardware.
2318 switch (skdev->state) {
2319 case SKD_DRVR_STATE_PAUSED:
2320 case SKD_DRVR_STATE_BUSY:
2321 case SKD_DRVR_STATE_BUSY_IMMINENT:
2322 case SKD_DRVR_STATE_BUSY_ERASE:
2323 case SKD_DRVR_STATE_STARTING:
2324 case SKD_DRVR_STATE_RESTARTING:
2325 case SKD_DRVR_STATE_FAULT:
2326 case SKD_DRVR_STATE_IDLE:
2327 case SKD_DRVR_STATE_LOAD:
2328 skdev->state = SKD_DRVR_STATE_ONLINE;
2329 dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
2330 skd_skdev_state_to_str(prev_driver_state),
2331 prev_driver_state, skd_skdev_state_to_str(skdev->state),
2333 dev_dbg(&skdev->pdev->dev,
2334 "**** device ONLINE...starting block queue\n");
2335 dev_dbg(&skdev->pdev->dev, "starting queue\n");
2336 dev_info(&skdev->pdev->dev, "STEC s1120 ONLINE\n");
2337 schedule_work(&skdev->start_queue);
2338 skdev->gendisk_on = 1;
2339 wake_up_interruptible(&skdev->waitq);
2342 case SKD_DRVR_STATE_DISAPPEARED:
2344 dev_dbg(&skdev->pdev->dev,
2345 "**** driver state %d, not implemented\n",
2353 *****************************************************************************
2354 * PCIe MSI/MSI-X INTERRUPT HANDLERS
2355 *****************************************************************************
2358 static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data)
2360 struct skd_device *skdev = skd_host_data;
2361 unsigned long flags;
2363 spin_lock_irqsave(&skdev->lock, flags);
2364 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2365 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2366 dev_err(&skdev->pdev->dev, "MSIX reserved irq %d = 0x%x\n", irq,
2367 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2368 SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST);
2369 spin_unlock_irqrestore(&skdev->lock, flags);
2373 static irqreturn_t skd_statec_isr(int irq, void *skd_host_data)
2375 struct skd_device *skdev = skd_host_data;
2376 unsigned long flags;
2378 spin_lock_irqsave(&skdev->lock, flags);
2379 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2380 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2381 SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST);
2382 skd_isr_fwstate(skdev);
2383 spin_unlock_irqrestore(&skdev->lock, flags);
2387 static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
2389 struct skd_device *skdev = skd_host_data;
2390 unsigned long flags;
2391 int flush_enqueued = 0;
2394 spin_lock_irqsave(&skdev->lock, flags);
2395 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2396 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2397 SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST);
2398 deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
2401 schedule_work(&skdev->start_queue);
2404 schedule_work(&skdev->completion_worker);
2405 else if (!flush_enqueued)
2406 schedule_work(&skdev->start_queue);
2408 spin_unlock_irqrestore(&skdev->lock, flags);
2413 static irqreturn_t skd_msg_isr(int irq, void *skd_host_data)
2415 struct skd_device *skdev = skd_host_data;
2416 unsigned long flags;
2418 spin_lock_irqsave(&skdev->lock, flags);
2419 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2420 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2421 SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST);
2422 skd_isr_msg_from_dev(skdev);
2423 spin_unlock_irqrestore(&skdev->lock, flags);
2427 static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data)
2429 struct skd_device *skdev = skd_host_data;
2430 unsigned long flags;
2432 spin_lock_irqsave(&skdev->lock, flags);
2433 dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
2434 SKD_READL(skdev, FIT_INT_STATUS_HOST));
2435 SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST);
2436 spin_unlock_irqrestore(&skdev->lock, flags);
2441 *****************************************************************************
2442 * PCIe MSI/MSI-X SETUP
2443 *****************************************************************************
2446 struct skd_msix_entry {
2450 struct skd_init_msix_entry {
2452 irq_handler_t handler;
2455 #define SKD_MAX_MSIX_COUNT 13
2456 #define SKD_MIN_MSIX_COUNT 7
2457 #define SKD_BASE_MSIX_IRQ 4
2459 static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = {
2460 { "(DMA 0)", skd_reserved_isr },
2461 { "(DMA 1)", skd_reserved_isr },
2462 { "(DMA 2)", skd_reserved_isr },
2463 { "(DMA 3)", skd_reserved_isr },
2464 { "(State Change)", skd_statec_isr },
2465 { "(COMPL_Q)", skd_comp_q },
2466 { "(MSG)", skd_msg_isr },
2467 { "(Reserved)", skd_reserved_isr },
2468 { "(Reserved)", skd_reserved_isr },
2469 { "(Queue Full 0)", skd_qfull_isr },
2470 { "(Queue Full 1)", skd_qfull_isr },
2471 { "(Queue Full 2)", skd_qfull_isr },
2472 { "(Queue Full 3)", skd_qfull_isr },
2475 static int skd_acquire_msix(struct skd_device *skdev)
2478 struct pci_dev *pdev = skdev->pdev;
2480 rc = pci_alloc_irq_vectors(pdev, SKD_MAX_MSIX_COUNT, SKD_MAX_MSIX_COUNT,
2483 dev_err(&skdev->pdev->dev, "failed to enable MSI-X %d\n", rc);
2487 skdev->msix_entries = kcalloc(SKD_MAX_MSIX_COUNT,
2488 sizeof(struct skd_msix_entry), GFP_KERNEL);
2489 if (!skdev->msix_entries) {
2491 dev_err(&skdev->pdev->dev, "msix table allocation error\n");
2495 /* Enable MSI-X vectors for the base queue */
2496 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
2497 struct skd_msix_entry *qentry = &skdev->msix_entries[i];
2499 snprintf(qentry->isr_name, sizeof(qentry->isr_name),
2500 "%s%d-msix %s", DRV_NAME, skdev->devno,
2501 msix_entries[i].name);
2503 rc = devm_request_irq(&skdev->pdev->dev,
2504 pci_irq_vector(skdev->pdev, i),
2505 msix_entries[i].handler, 0,
2506 qentry->isr_name, skdev);
2508 dev_err(&skdev->pdev->dev,
2509 "Unable to register(%d) MSI-X handler %d: %s\n",
2510 rc, i, qentry->isr_name);
2515 dev_dbg(&skdev->pdev->dev, "%d msix irq(s) enabled\n",
2516 SKD_MAX_MSIX_COUNT);
2521 devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), skdev);
2523 kfree(skdev->msix_entries);
2524 skdev->msix_entries = NULL;
2528 static int skd_acquire_irq(struct skd_device *skdev)
2530 struct pci_dev *pdev = skdev->pdev;
2531 unsigned int irq_flag = PCI_IRQ_LEGACY;
2534 if (skd_isr_type == SKD_IRQ_MSIX) {
2535 rc = skd_acquire_msix(skdev);
2539 dev_err(&skdev->pdev->dev,
2540 "failed to enable MSI-X, re-trying with MSI %d\n", rc);
2543 snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d", DRV_NAME,
2546 if (skd_isr_type != SKD_IRQ_LEGACY)
2547 irq_flag |= PCI_IRQ_MSI;
2548 rc = pci_alloc_irq_vectors(pdev, 1, 1, irq_flag);
2550 dev_err(&skdev->pdev->dev,
2551 "failed to allocate the MSI interrupt %d\n", rc);
2555 rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr,
2556 pdev->msi_enabled ? 0 : IRQF_SHARED,
2557 skdev->isr_name, skdev);
2559 pci_free_irq_vectors(pdev);
2560 dev_err(&skdev->pdev->dev, "failed to allocate interrupt %d\n",
2568 static void skd_release_irq(struct skd_device *skdev)
2570 struct pci_dev *pdev = skdev->pdev;
2572 if (skdev->msix_entries) {
2575 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
2576 devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i),
2580 kfree(skdev->msix_entries);
2581 skdev->msix_entries = NULL;
2583 devm_free_irq(&pdev->dev, pdev->irq, skdev);
2586 pci_free_irq_vectors(pdev);
2590 *****************************************************************************
2592 *****************************************************************************
2595 static void *skd_alloc_dma(struct skd_device *skdev, struct kmem_cache *s,
2596 dma_addr_t *dma_handle, gfp_t gfp,
2597 enum dma_data_direction dir)
2599 struct device *dev = &skdev->pdev->dev;
2602 buf = kmem_cache_alloc(s, gfp);
2605 *dma_handle = dma_map_single(dev, buf, s->size, dir);
2606 if (dma_mapping_error(dev, *dma_handle)) {
2613 static void skd_free_dma(struct skd_device *skdev, struct kmem_cache *s,
2614 void *vaddr, dma_addr_t dma_handle,
2615 enum dma_data_direction dir)
2620 dma_unmap_single(&skdev->pdev->dev, dma_handle, s->size, dir);
2621 kmem_cache_free(s, vaddr);
2624 static int skd_cons_skcomp(struct skd_device *skdev)
2627 struct fit_completion_entry_v1 *skcomp;
2629 dev_dbg(&skdev->pdev->dev,
2630 "comp pci_alloc, total bytes %zd entries %d\n",
2631 SKD_SKCOMP_SIZE, SKD_N_COMPLETION_ENTRY);
2633 skcomp = pci_zalloc_consistent(skdev->pdev, SKD_SKCOMP_SIZE,
2634 &skdev->cq_dma_address);
2636 if (skcomp == NULL) {
2641 skdev->skcomp_table = skcomp;
2642 skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp +
2644 SKD_N_COMPLETION_ENTRY);
2650 static int skd_cons_skmsg(struct skd_device *skdev)
2655 dev_dbg(&skdev->pdev->dev,
2656 "skmsg_table kcalloc, struct %lu, count %u total %lu\n",
2657 sizeof(struct skd_fitmsg_context), skdev->num_fitmsg_context,
2658 sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context);
2660 skdev->skmsg_table = kcalloc(skdev->num_fitmsg_context,
2661 sizeof(struct skd_fitmsg_context),
2663 if (skdev->skmsg_table == NULL) {
2668 for (i = 0; i < skdev->num_fitmsg_context; i++) {
2669 struct skd_fitmsg_context *skmsg;
2671 skmsg = &skdev->skmsg_table[i];
2673 skmsg->id = i + SKD_ID_FIT_MSG;
2675 skmsg->msg_buf = pci_alloc_consistent(skdev->pdev,
2677 &skmsg->mb_dma_address);
2679 if (skmsg->msg_buf == NULL) {
2684 WARN(((uintptr_t)skmsg->msg_buf | skmsg->mb_dma_address) &
2685 (FIT_QCMD_ALIGN - 1),
2686 "not aligned: msg_buf %p mb_dma_address %#llx\n",
2687 skmsg->msg_buf, skmsg->mb_dma_address);
2688 memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES);
2695 static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
2697 dma_addr_t *ret_dma_addr)
2699 struct fit_sg_descriptor *sg_list;
2701 sg_list = skd_alloc_dma(skdev, skdev->sglist_cache, ret_dma_addr,
2702 GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
2704 if (sg_list != NULL) {
2705 uint64_t dma_address = *ret_dma_addr;
2708 for (i = 0; i < n_sg - 1; i++) {
2710 ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
2712 sg_list[i].next_desc_ptr = dma_address + ndp_off;
2714 sg_list[i].next_desc_ptr = 0LL;
2720 static void skd_free_sg_list(struct skd_device *skdev,
2721 struct fit_sg_descriptor *sg_list,
2722 dma_addr_t dma_addr)
2724 if (WARN_ON_ONCE(!sg_list))
2727 skd_free_dma(skdev, skdev->sglist_cache, sg_list, dma_addr,
2731 static int skd_init_request(struct blk_mq_tag_set *set, struct request *rq,
2732 unsigned int hctx_idx, unsigned int numa_node)
2734 struct skd_device *skdev = set->driver_data;
2735 struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
2737 skreq->state = SKD_REQ_STATE_IDLE;
2738 skreq->sg = (void *)(skreq + 1);
2739 sg_init_table(skreq->sg, skd_sgs_per_request);
2740 skreq->sksg_list = skd_cons_sg_list(skdev, skd_sgs_per_request,
2741 &skreq->sksg_dma_address);
2743 return skreq->sksg_list ? 0 : -ENOMEM;
2746 static void skd_exit_request(struct blk_mq_tag_set *set, struct request *rq,
2747 unsigned int hctx_idx)
2749 struct skd_device *skdev = set->driver_data;
2750 struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
2752 skd_free_sg_list(skdev, skreq->sksg_list, skreq->sksg_dma_address);
2755 static int skd_cons_sksb(struct skd_device *skdev)
2758 struct skd_special_context *skspcl;
2760 skspcl = &skdev->internal_skspcl;
2762 skspcl->req.id = 0 + SKD_ID_INTERNAL;
2763 skspcl->req.state = SKD_REQ_STATE_IDLE;
2765 skspcl->data_buf = skd_alloc_dma(skdev, skdev->databuf_cache,
2766 &skspcl->db_dma_address,
2767 GFP_DMA | __GFP_ZERO,
2769 if (skspcl->data_buf == NULL) {
2774 skspcl->msg_buf = skd_alloc_dma(skdev, skdev->msgbuf_cache,
2775 &skspcl->mb_dma_address,
2776 GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
2777 if (skspcl->msg_buf == NULL) {
2782 skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1,
2783 &skspcl->req.sksg_dma_address);
2784 if (skspcl->req.sksg_list == NULL) {
2789 if (!skd_format_internal_skspcl(skdev)) {
2798 static const struct blk_mq_ops skd_mq_ops = {
2799 .queue_rq = skd_mq_queue_rq,
2800 .complete = skd_complete_rq,
2801 .timeout = skd_timed_out,
2802 .init_request = skd_init_request,
2803 .exit_request = skd_exit_request,
2806 static int skd_cons_disk(struct skd_device *skdev)
2809 struct gendisk *disk;
2810 struct request_queue *q;
2811 unsigned long flags;
2813 disk = alloc_disk(SKD_MINORS_PER_DEVICE);
2820 sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno);
2822 disk->major = skdev->major;
2823 disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE;
2824 disk->fops = &skd_blockdev_ops;
2825 disk->private_data = skdev;
2827 memset(&skdev->tag_set, 0, sizeof(skdev->tag_set));
2828 skdev->tag_set.ops = &skd_mq_ops;
2829 skdev->tag_set.nr_hw_queues = 1;
2830 skdev->tag_set.queue_depth = skd_max_queue_depth;
2831 skdev->tag_set.cmd_size = sizeof(struct skd_request_context) +
2832 skdev->sgs_per_request * sizeof(struct scatterlist);
2833 skdev->tag_set.numa_node = NUMA_NO_NODE;
2834 skdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
2836 BLK_ALLOC_POLICY_TO_MQ_FLAG(BLK_TAG_ALLOC_FIFO);
2837 skdev->tag_set.driver_data = skdev;
2838 rc = blk_mq_alloc_tag_set(&skdev->tag_set);
2841 q = blk_mq_init_queue(&skdev->tag_set);
2843 blk_mq_free_tag_set(&skdev->tag_set);
2847 q->queuedata = skdev;
2852 blk_queue_write_cache(q, true, true);
2853 blk_queue_max_segments(q, skdev->sgs_per_request);
2854 blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);
2856 /* set optimal I/O size to 8KB */
2857 blk_queue_io_opt(q, 8192);
2859 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2860 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
2862 blk_queue_rq_timeout(q, 8 * HZ);
2864 spin_lock_irqsave(&skdev->lock, flags);
2865 dev_dbg(&skdev->pdev->dev, "stopping queue\n");
2866 blk_mq_stop_hw_queues(skdev->queue);
2867 spin_unlock_irqrestore(&skdev->lock, flags);
2873 #define SKD_N_DEV_TABLE 16u
2874 static u32 skd_next_devno;
2876 static struct skd_device *skd_construct(struct pci_dev *pdev)
2878 struct skd_device *skdev;
2879 int blk_major = skd_major;
2883 skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
2886 dev_err(&pdev->dev, "memory alloc failure\n");
2890 skdev->state = SKD_DRVR_STATE_LOAD;
2892 skdev->devno = skd_next_devno++;
2893 skdev->major = blk_major;
2894 skdev->dev_max_queue_depth = 0;
2896 skdev->num_req_context = skd_max_queue_depth;
2897 skdev->num_fitmsg_context = skd_max_queue_depth;
2898 skdev->cur_max_queue_depth = 1;
2899 skdev->queue_low_water_mark = 1;
2900 skdev->proto_ver = 99;
2901 skdev->sgs_per_request = skd_sgs_per_request;
2902 skdev->dbg_level = skd_dbg_level;
2904 spin_lock_init(&skdev->lock);
2906 INIT_WORK(&skdev->start_queue, skd_start_queue);
2907 INIT_WORK(&skdev->completion_worker, skd_completion_worker);
2909 size = max(SKD_N_FITMSG_BYTES, SKD_N_SPECIAL_FITMSG_BYTES);
2910 skdev->msgbuf_cache = kmem_cache_create("skd-msgbuf", size, 0,
2911 SLAB_HWCACHE_ALIGN, NULL);
2912 if (!skdev->msgbuf_cache)
2914 WARN_ONCE(kmem_cache_size(skdev->msgbuf_cache) < size,
2915 "skd-msgbuf: %d < %zd\n",
2916 kmem_cache_size(skdev->msgbuf_cache), size);
2917 size = skd_sgs_per_request * sizeof(struct fit_sg_descriptor);
2918 skdev->sglist_cache = kmem_cache_create("skd-sglist", size, 0,
2919 SLAB_HWCACHE_ALIGN, NULL);
2920 if (!skdev->sglist_cache)
2922 WARN_ONCE(kmem_cache_size(skdev->sglist_cache) < size,
2923 "skd-sglist: %d < %zd\n",
2924 kmem_cache_size(skdev->sglist_cache), size);
2925 size = SKD_N_INTERNAL_BYTES;
2926 skdev->databuf_cache = kmem_cache_create("skd-databuf", size, 0,
2927 SLAB_HWCACHE_ALIGN, NULL);
2928 if (!skdev->databuf_cache)
2930 WARN_ONCE(kmem_cache_size(skdev->databuf_cache) < size,
2931 "skd-databuf: %d < %zd\n",
2932 kmem_cache_size(skdev->databuf_cache), size);
2934 dev_dbg(&skdev->pdev->dev, "skcomp\n");
2935 rc = skd_cons_skcomp(skdev);
2939 dev_dbg(&skdev->pdev->dev, "skmsg\n");
2940 rc = skd_cons_skmsg(skdev);
2944 dev_dbg(&skdev->pdev->dev, "sksb\n");
2945 rc = skd_cons_sksb(skdev);
2949 dev_dbg(&skdev->pdev->dev, "disk\n");
2950 rc = skd_cons_disk(skdev);
2954 dev_dbg(&skdev->pdev->dev, "VICTORY\n");
2958 dev_dbg(&skdev->pdev->dev, "construct failed\n");
2959 skd_destruct(skdev);
2964 *****************************************************************************
2966 *****************************************************************************
2969 static void skd_free_skcomp(struct skd_device *skdev)
2971 if (skdev->skcomp_table)
2972 pci_free_consistent(skdev->pdev, SKD_SKCOMP_SIZE,
2973 skdev->skcomp_table, skdev->cq_dma_address);
2975 skdev->skcomp_table = NULL;
2976 skdev->cq_dma_address = 0;
2979 static void skd_free_skmsg(struct skd_device *skdev)
2983 if (skdev->skmsg_table == NULL)
2986 for (i = 0; i < skdev->num_fitmsg_context; i++) {
2987 struct skd_fitmsg_context *skmsg;
2989 skmsg = &skdev->skmsg_table[i];
2991 if (skmsg->msg_buf != NULL) {
2992 pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES,
2994 skmsg->mb_dma_address);
2996 skmsg->msg_buf = NULL;
2997 skmsg->mb_dma_address = 0;
3000 kfree(skdev->skmsg_table);
3001 skdev->skmsg_table = NULL;
3004 static void skd_free_sksb(struct skd_device *skdev)
3006 struct skd_special_context *skspcl = &skdev->internal_skspcl;
3008 skd_free_dma(skdev, skdev->databuf_cache, skspcl->data_buf,
3009 skspcl->db_dma_address, DMA_BIDIRECTIONAL);
3011 skspcl->data_buf = NULL;
3012 skspcl->db_dma_address = 0;
3014 skd_free_dma(skdev, skdev->msgbuf_cache, skspcl->msg_buf,
3015 skspcl->mb_dma_address, DMA_TO_DEVICE);
3017 skspcl->msg_buf = NULL;
3018 skspcl->mb_dma_address = 0;
3020 skd_free_sg_list(skdev, skspcl->req.sksg_list,
3021 skspcl->req.sksg_dma_address);
3023 skspcl->req.sksg_list = NULL;
3024 skspcl->req.sksg_dma_address = 0;
3027 static void skd_free_disk(struct skd_device *skdev)
3029 struct gendisk *disk = skdev->disk;
3031 if (disk && (disk->flags & GENHD_FL_UP))
3035 blk_cleanup_queue(skdev->queue);
3036 skdev->queue = NULL;
3041 if (skdev->tag_set.tags)
3042 blk_mq_free_tag_set(&skdev->tag_set);
3048 static void skd_destruct(struct skd_device *skdev)
3053 cancel_work_sync(&skdev->start_queue);
3055 dev_dbg(&skdev->pdev->dev, "disk\n");
3056 skd_free_disk(skdev);
3058 dev_dbg(&skdev->pdev->dev, "sksb\n");
3059 skd_free_sksb(skdev);
3061 dev_dbg(&skdev->pdev->dev, "skmsg\n");
3062 skd_free_skmsg(skdev);
3064 dev_dbg(&skdev->pdev->dev, "skcomp\n");
3065 skd_free_skcomp(skdev);
3067 kmem_cache_destroy(skdev->databuf_cache);
3068 kmem_cache_destroy(skdev->sglist_cache);
3069 kmem_cache_destroy(skdev->msgbuf_cache);
3071 dev_dbg(&skdev->pdev->dev, "skdev\n");
3076 *****************************************************************************
3077 * BLOCK DEVICE (BDEV) GLUE
3078 *****************************************************************************
3081 static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3083 struct skd_device *skdev;
3086 skdev = bdev->bd_disk->private_data;
3088 dev_dbg(&skdev->pdev->dev, "%s: CMD[%s] getgeo device\n",
3089 bdev->bd_disk->disk_name, current->comm);
3091 if (skdev->read_cap_is_valid) {
3092 capacity = get_capacity(skdev->disk);
3095 geo->cylinders = (capacity) / (255 * 64);
3102 static int skd_bdev_attach(struct device *parent, struct skd_device *skdev)
3104 dev_dbg(&skdev->pdev->dev, "add_disk\n");
3105 device_add_disk(parent, skdev->disk);
3109 static const struct block_device_operations skd_blockdev_ops = {
3110 .owner = THIS_MODULE,
3111 .getgeo = skd_bdev_getgeo,
3115 *****************************************************************************
3117 *****************************************************************************
3120 static const struct pci_device_id skd_pci_tbl[] = {
3121 { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120,
3122 PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
3123 { 0 } /* terminate list */
3126 MODULE_DEVICE_TABLE(pci, skd_pci_tbl);
3128 static char *skd_pci_info(struct skd_device *skdev, char *str)
3132 strcpy(str, "PCIe (");
3133 pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP);
3138 uint16_t pcie_lstat, lspeed, lwidth;
3141 pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat);
3142 lspeed = pcie_lstat & (0xF);
3143 lwidth = (pcie_lstat & 0x3F0) >> 4;
3146 strcat(str, "2.5GT/s ");
3147 else if (lspeed == 2)
3148 strcat(str, "5.0GT/s ");
3150 strcat(str, "<unknown> ");
3151 snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth);
3157 static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
3162 struct skd_device *skdev;
3164 dev_dbg(&pdev->dev, "vendor=%04X device=%04x\n", pdev->vendor,
3167 rc = pci_enable_device(pdev);
3170 rc = pci_request_regions(pdev, DRV_NAME);
3173 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
3175 if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
3176 dev_err(&pdev->dev, "consistent DMA mask error %d\n",
3180 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
3182 dev_err(&pdev->dev, "DMA mask error %d\n", rc);
3183 goto err_out_regions;
3188 rc = register_blkdev(0, DRV_NAME);
3190 goto err_out_regions;
3195 skdev = skd_construct(pdev);
3196 if (skdev == NULL) {
3198 goto err_out_regions;
3201 skd_pci_info(skdev, pci_str);
3202 dev_info(&pdev->dev, "%s 64bit\n", pci_str);
3204 pci_set_master(pdev);
3205 rc = pci_enable_pcie_error_reporting(pdev);
3208 "bad enable of PCIe error reporting rc=%d\n", rc);
3209 skdev->pcie_error_reporting_is_enabled = 0;
3211 skdev->pcie_error_reporting_is_enabled = 1;
3213 pci_set_drvdata(pdev, skdev);
3215 for (i = 0; i < SKD_MAX_BARS; i++) {
3216 skdev->mem_phys[i] = pci_resource_start(pdev, i);
3217 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
3218 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
3219 skdev->mem_size[i]);
3220 if (!skdev->mem_map[i]) {
3222 "Unable to map adapter memory!\n");
3224 goto err_out_iounmap;
3226 dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
3227 skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
3228 skdev->mem_size[i]);
3231 rc = skd_acquire_irq(skdev);
3233 dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
3234 goto err_out_iounmap;
3237 rc = skd_start_timer(skdev);
3241 init_waitqueue_head(&skdev->waitq);
3243 skd_start_device(skdev);
3245 rc = wait_event_interruptible_timeout(skdev->waitq,
3246 (skdev->gendisk_on),
3247 (SKD_START_WAIT_SECONDS * HZ));
3248 if (skdev->gendisk_on > 0) {
3249 /* device came on-line after reset */
3250 skd_bdev_attach(&pdev->dev, skdev);
3253 /* we timed out, something is wrong with the device,
3254 don't add the disk structure */
3255 dev_err(&pdev->dev, "error: waiting for s1120 timed out %d!\n",
3257 /* in case of no error; we timeout with ENXIO */
3266 skd_stop_device(skdev);
3267 skd_release_irq(skdev);
3270 for (i = 0; i < SKD_MAX_BARS; i++)
3271 if (skdev->mem_map[i])
3272 iounmap(skdev->mem_map[i]);
3274 if (skdev->pcie_error_reporting_is_enabled)
3275 pci_disable_pcie_error_reporting(pdev);
3277 skd_destruct(skdev);
3280 pci_release_regions(pdev);
3283 pci_disable_device(pdev);
3284 pci_set_drvdata(pdev, NULL);
3288 static void skd_pci_remove(struct pci_dev *pdev)
3291 struct skd_device *skdev;
3293 skdev = pci_get_drvdata(pdev);
3295 dev_err(&pdev->dev, "no device data for PCI\n");
3298 skd_stop_device(skdev);
3299 skd_release_irq(skdev);
3301 for (i = 0; i < SKD_MAX_BARS; i++)
3302 if (skdev->mem_map[i])
3303 iounmap(skdev->mem_map[i]);
3305 if (skdev->pcie_error_reporting_is_enabled)
3306 pci_disable_pcie_error_reporting(pdev);
3308 skd_destruct(skdev);
3310 pci_release_regions(pdev);
3311 pci_disable_device(pdev);
3312 pci_set_drvdata(pdev, NULL);
3317 static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
3320 struct skd_device *skdev;
3322 skdev = pci_get_drvdata(pdev);
3324 dev_err(&pdev->dev, "no device data for PCI\n");
3328 skd_stop_device(skdev);
3330 skd_release_irq(skdev);
3332 for (i = 0; i < SKD_MAX_BARS; i++)
3333 if (skdev->mem_map[i])
3334 iounmap(skdev->mem_map[i]);
3336 if (skdev->pcie_error_reporting_is_enabled)
3337 pci_disable_pcie_error_reporting(pdev);
3339 pci_release_regions(pdev);
3340 pci_save_state(pdev);
3341 pci_disable_device(pdev);
3342 pci_set_power_state(pdev, pci_choose_state(pdev, state));
3346 static int skd_pci_resume(struct pci_dev *pdev)
3350 struct skd_device *skdev;
3352 skdev = pci_get_drvdata(pdev);
3354 dev_err(&pdev->dev, "no device data for PCI\n");
3358 pci_set_power_state(pdev, PCI_D0);
3359 pci_enable_wake(pdev, PCI_D0, 0);
3360 pci_restore_state(pdev);
3362 rc = pci_enable_device(pdev);
3365 rc = pci_request_regions(pdev, DRV_NAME);
3368 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
3370 if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
3372 dev_err(&pdev->dev, "consistent DMA mask error %d\n",
3376 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
3379 dev_err(&pdev->dev, "DMA mask error %d\n", rc);
3380 goto err_out_regions;
3384 pci_set_master(pdev);
3385 rc = pci_enable_pcie_error_reporting(pdev);
3388 "bad enable of PCIe error reporting rc=%d\n", rc);
3389 skdev->pcie_error_reporting_is_enabled = 0;
3391 skdev->pcie_error_reporting_is_enabled = 1;
3393 for (i = 0; i < SKD_MAX_BARS; i++) {
3395 skdev->mem_phys[i] = pci_resource_start(pdev, i);
3396 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
3397 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
3398 skdev->mem_size[i]);
3399 if (!skdev->mem_map[i]) {
3400 dev_err(&pdev->dev, "Unable to map adapter memory!\n");
3402 goto err_out_iounmap;
3404 dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
3405 skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
3406 skdev->mem_size[i]);
3408 rc = skd_acquire_irq(skdev);
3410 dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
3411 goto err_out_iounmap;
3414 rc = skd_start_timer(skdev);
3418 init_waitqueue_head(&skdev->waitq);
3420 skd_start_device(skdev);
3425 skd_stop_device(skdev);
3426 skd_release_irq(skdev);
3429 for (i = 0; i < SKD_MAX_BARS; i++)
3430 if (skdev->mem_map[i])
3431 iounmap(skdev->mem_map[i]);
3433 if (skdev->pcie_error_reporting_is_enabled)
3434 pci_disable_pcie_error_reporting(pdev);
3437 pci_release_regions(pdev);
3440 pci_disable_device(pdev);
3444 static void skd_pci_shutdown(struct pci_dev *pdev)
3446 struct skd_device *skdev;
3448 dev_err(&pdev->dev, "%s called\n", __func__);
3450 skdev = pci_get_drvdata(pdev);
3452 dev_err(&pdev->dev, "no device data for PCI\n");
3456 dev_err(&pdev->dev, "calling stop\n");
3457 skd_stop_device(skdev);
3460 static struct pci_driver skd_driver = {
3462 .id_table = skd_pci_tbl,
3463 .probe = skd_pci_probe,
3464 .remove = skd_pci_remove,
3465 .suspend = skd_pci_suspend,
3466 .resume = skd_pci_resume,
3467 .shutdown = skd_pci_shutdown,
3471 *****************************************************************************
3473 *****************************************************************************
3476 const char *skd_drive_state_to_str(int state)
3479 case FIT_SR_DRIVE_OFFLINE:
3481 case FIT_SR_DRIVE_INIT:
3483 case FIT_SR_DRIVE_ONLINE:
3485 case FIT_SR_DRIVE_BUSY:
3487 case FIT_SR_DRIVE_FAULT:
3489 case FIT_SR_DRIVE_DEGRADED:
3491 case FIT_SR_PCIE_LINK_DOWN:
3493 case FIT_SR_DRIVE_SOFT_RESET:
3494 return "SOFT_RESET";
3495 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
3497 case FIT_SR_DRIVE_INIT_FAULT:
3498 return "INIT_FAULT";
3499 case FIT_SR_DRIVE_BUSY_SANITIZE:
3500 return "BUSY_SANITIZE";
3501 case FIT_SR_DRIVE_BUSY_ERASE:
3502 return "BUSY_ERASE";
3503 case FIT_SR_DRIVE_FW_BOOTING:
3504 return "FW_BOOTING";
3510 const char *skd_skdev_state_to_str(enum skd_drvr_state state)
3513 case SKD_DRVR_STATE_LOAD:
3515 case SKD_DRVR_STATE_IDLE:
3517 case SKD_DRVR_STATE_BUSY:
3519 case SKD_DRVR_STATE_STARTING:
3521 case SKD_DRVR_STATE_ONLINE:
3523 case SKD_DRVR_STATE_PAUSING:
3525 case SKD_DRVR_STATE_PAUSED:
3527 case SKD_DRVR_STATE_RESTARTING:
3528 return "RESTARTING";
3529 case SKD_DRVR_STATE_RESUMING:
3531 case SKD_DRVR_STATE_STOPPING:
3533 case SKD_DRVR_STATE_SYNCING:
3535 case SKD_DRVR_STATE_FAULT:
3537 case SKD_DRVR_STATE_DISAPPEARED:
3538 return "DISAPPEARED";
3539 case SKD_DRVR_STATE_BUSY_ERASE:
3540 return "BUSY_ERASE";
3541 case SKD_DRVR_STATE_BUSY_SANITIZE:
3542 return "BUSY_SANITIZE";
3543 case SKD_DRVR_STATE_BUSY_IMMINENT:
3544 return "BUSY_IMMINENT";
3545 case SKD_DRVR_STATE_WAIT_BOOT:
3553 static const char *skd_skreq_state_to_str(enum skd_req_state state)
3556 case SKD_REQ_STATE_IDLE:
3558 case SKD_REQ_STATE_SETUP:
3560 case SKD_REQ_STATE_BUSY:
3562 case SKD_REQ_STATE_COMPLETED:
3564 case SKD_REQ_STATE_TIMEOUT:
3571 static void skd_log_skdev(struct skd_device *skdev, const char *event)
3573 dev_dbg(&skdev->pdev->dev, "skdev=%p event='%s'\n", skdev, event);
3574 dev_dbg(&skdev->pdev->dev, " drive_state=%s(%d) driver_state=%s(%d)\n",
3575 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
3576 skd_skdev_state_to_str(skdev->state), skdev->state);
3577 dev_dbg(&skdev->pdev->dev, " busy=%d limit=%d dev=%d lowat=%d\n",
3578 skd_in_flight(skdev), skdev->cur_max_queue_depth,
3579 skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
3580 dev_dbg(&skdev->pdev->dev, " cycle=%d cycle_ix=%d\n",
3581 skdev->skcomp_cycle, skdev->skcomp_ix);
3584 static void skd_log_skreq(struct skd_device *skdev,
3585 struct skd_request_context *skreq, const char *event)
3587 struct request *req = blk_mq_rq_from_pdu(skreq);
3588 u32 lba = blk_rq_pos(req);
3589 u32 count = blk_rq_sectors(req);
3591 dev_dbg(&skdev->pdev->dev, "skreq=%p event='%s'\n", skreq, event);
3592 dev_dbg(&skdev->pdev->dev, " state=%s(%d) id=0x%04x fitmsg=0x%04x\n",
3593 skd_skreq_state_to_str(skreq->state), skreq->state, skreq->id,
3595 dev_dbg(&skdev->pdev->dev, " sg_dir=%d n_sg=%d\n",
3596 skreq->data_dir, skreq->n_sg);
3598 dev_dbg(&skdev->pdev->dev,
3599 "req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba, lba,
3600 count, count, (int)rq_data_dir(req));
3604 *****************************************************************************
3606 *****************************************************************************
3609 static int __init skd_init(void)
3611 BUILD_BUG_ON(sizeof(struct fit_completion_entry_v1) != 8);
3612 BUILD_BUG_ON(sizeof(struct fit_comp_error_info) != 32);
3613 BUILD_BUG_ON(sizeof(struct skd_command_header) != 16);
3614 BUILD_BUG_ON(sizeof(struct skd_scsi_request) != 32);
3615 BUILD_BUG_ON(sizeof(struct driver_inquiry_data) != 44);
3616 BUILD_BUG_ON(offsetof(struct skd_msg_buf, fmh) != 0);
3617 BUILD_BUG_ON(offsetof(struct skd_msg_buf, scsi) != 64);
3618 BUILD_BUG_ON(sizeof(struct skd_msg_buf) != SKD_N_FITMSG_BYTES);
3620 switch (skd_isr_type) {
3621 case SKD_IRQ_LEGACY:
3626 pr_err(PFX "skd_isr_type %d invalid, re-set to %d\n",
3627 skd_isr_type, SKD_IRQ_DEFAULT);
3628 skd_isr_type = SKD_IRQ_DEFAULT;
3631 if (skd_max_queue_depth < 1 ||
3632 skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) {
3633 pr_err(PFX "skd_max_queue_depth %d invalid, re-set to %d\n",
3634 skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT);
3635 skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
3638 if (skd_max_req_per_msg < 1 ||
3639 skd_max_req_per_msg > SKD_MAX_REQ_PER_MSG) {
3640 pr_err(PFX "skd_max_req_per_msg %d invalid, re-set to %d\n",
3641 skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT);
3642 skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
3645 if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) {
3646 pr_err(PFX "skd_sg_per_request %d invalid, re-set to %d\n",
3647 skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT);
3648 skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
3651 if (skd_dbg_level < 0 || skd_dbg_level > 2) {
3652 pr_err(PFX "skd_dbg_level %d invalid, re-set to %d\n",
3657 if (skd_isr_comp_limit < 0) {
3658 pr_err(PFX "skd_isr_comp_limit %d invalid, set to %d\n",
3659 skd_isr_comp_limit, 0);
3660 skd_isr_comp_limit = 0;
3663 return pci_register_driver(&skd_driver);
3666 static void __exit skd_exit(void)
3668 pci_unregister_driver(&skd_driver);
3671 unregister_blkdev(skd_major, DRV_NAME);
3674 module_init(skd_init);
3675 module_exit(skd_exit);