2 * NVM Express device driver
3 * Copyright (c) 2011-2014, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 #include <linux/nvme.h>
16 #include <linux/bitops.h>
17 #include <linux/blkdev.h>
18 #include <linux/blk-mq.h>
19 #include <linux/cpu.h>
20 #include <linux/delay.h>
21 #include <linux/errno.h>
23 #include <linux/genhd.h>
24 #include <linux/hdreg.h>
25 #include <linux/idr.h>
26 #include <linux/init.h>
27 #include <linux/interrupt.h>
29 #include <linux/kdev_t.h>
30 #include <linux/kthread.h>
31 #include <linux/kernel.h>
32 #include <linux/list_sort.h>
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/pci.h>
37 #include <linux/poison.h>
38 #include <linux/ptrace.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/t10-pi.h>
42 #include <linux/types.h>
44 #include <asm-generic/io-64-nonatomic-lo-hi.h>
46 #define NVME_MINORS (1U << MINORBITS)
47 #define NVME_Q_DEPTH 1024
48 #define NVME_AQ_DEPTH 256
49 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
50 #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
51 #define ADMIN_TIMEOUT (admin_timeout * HZ)
52 #define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)
54 static unsigned char admin_timeout = 60;
55 module_param(admin_timeout, byte, 0644);
56 MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
58 unsigned char nvme_io_timeout = 30;
59 module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
60 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
62 static unsigned char shutdown_timeout = 5;
63 module_param(shutdown_timeout, byte, 0644);
64 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
66 static int nvme_major;
67 module_param(nvme_major, int, 0);
69 static int nvme_char_major;
70 module_param(nvme_char_major, int, 0);
72 static int use_threaded_interrupts;
73 module_param(use_threaded_interrupts, int, 0);
75 static DEFINE_SPINLOCK(dev_list_lock);
76 static LIST_HEAD(dev_list);
77 static struct task_struct *nvme_thread;
78 static struct workqueue_struct *nvme_workq;
79 static wait_queue_head_t nvme_kthread_wait;
81 static struct class *nvme_class;
83 static void nvme_reset_failed_dev(struct work_struct *ws);
84 static int nvme_reset(struct nvme_dev *dev);
85 static int nvme_process_cq(struct nvme_queue *nvmeq);
87 struct async_cmd_info {
88 struct kthread_work work;
89 struct kthread_worker *worker;
97 * An NVM Express queue. Each device has at least two (one for admin
98 * commands and one for I/O commands).
101 struct device *q_dmadev;
102 struct nvme_dev *dev;
103 char irqname[24]; /* nvme4294967295-65535\0 */
105 struct nvme_command *sq_cmds;
106 volatile struct nvme_completion *cqes;
107 struct blk_mq_tags **tags;
108 dma_addr_t sq_dma_addr;
109 dma_addr_t cq_dma_addr;
119 struct async_cmd_info cmdinfo;
123 * Check we didin't inadvertently grow the command struct
125 static inline void _nvme_check_size(void)
127 BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
128 BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64);
129 BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64);
130 BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64);
131 BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
132 BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
133 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
134 BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
135 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096);
136 BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096);
137 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
138 BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
141 typedef void (*nvme_completion_fn)(struct nvme_queue *, void *,
142 struct nvme_completion *);
144 struct nvme_cmd_info {
145 nvme_completion_fn fn;
148 struct nvme_queue *nvmeq;
149 struct nvme_iod iod[0];
153 * Max size of iod being embedded in the request payload
155 #define NVME_INT_PAGES 2
156 #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->page_size)
157 #define NVME_INT_MASK 0x01
160 * Will slightly overestimate the number of pages needed. This is OK
161 * as it only leads to a small amount of wasted memory for the lifetime of
164 static int nvme_npages(unsigned size, struct nvme_dev *dev)
166 unsigned nprps = DIV_ROUND_UP(size + dev->page_size, dev->page_size);
167 return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
170 static unsigned int nvme_cmd_size(struct nvme_dev *dev)
172 unsigned int ret = sizeof(struct nvme_cmd_info);
174 ret += sizeof(struct nvme_iod);
175 ret += sizeof(__le64 *) * nvme_npages(NVME_INT_BYTES(dev), dev);
176 ret += sizeof(struct scatterlist) * NVME_INT_PAGES;
181 static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
182 unsigned int hctx_idx)
184 struct nvme_dev *dev = data;
185 struct nvme_queue *nvmeq = dev->queues[0];
187 WARN_ON(hctx_idx != 0);
188 WARN_ON(dev->admin_tagset.tags[0] != hctx->tags);
189 WARN_ON(nvmeq->tags);
191 hctx->driver_data = nvmeq;
192 nvmeq->tags = &dev->admin_tagset.tags[0];
196 static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
198 struct nvme_queue *nvmeq = hctx->driver_data;
203 static int nvme_admin_init_request(void *data, struct request *req,
204 unsigned int hctx_idx, unsigned int rq_idx,
205 unsigned int numa_node)
207 struct nvme_dev *dev = data;
208 struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
209 struct nvme_queue *nvmeq = dev->queues[0];
216 static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
217 unsigned int hctx_idx)
219 struct nvme_dev *dev = data;
220 struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];
223 nvmeq->tags = &dev->tagset.tags[hctx_idx];
225 WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags);
226 hctx->driver_data = nvmeq;
230 static int nvme_init_request(void *data, struct request *req,
231 unsigned int hctx_idx, unsigned int rq_idx,
232 unsigned int numa_node)
234 struct nvme_dev *dev = data;
235 struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
236 struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];
243 static void nvme_set_info(struct nvme_cmd_info *cmd, void *ctx,
244 nvme_completion_fn handler)
249 blk_mq_start_request(blk_mq_rq_from_pdu(cmd));
252 static void *iod_get_private(struct nvme_iod *iod)
254 return (void *) (iod->private & ~0x1UL);
258 * If bit 0 is set, the iod is embedded in the request payload.
260 static bool iod_should_kfree(struct nvme_iod *iod)
262 return (iod->private & NVME_INT_MASK) == 0;
265 /* Special values must be less than 0x1000 */
266 #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
267 #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
268 #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
269 #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
271 static void special_completion(struct nvme_queue *nvmeq, void *ctx,
272 struct nvme_completion *cqe)
274 if (ctx == CMD_CTX_CANCELLED)
276 if (ctx == CMD_CTX_COMPLETED) {
277 dev_warn(nvmeq->q_dmadev,
278 "completed id %d twice on queue %d\n",
279 cqe->command_id, le16_to_cpup(&cqe->sq_id));
282 if (ctx == CMD_CTX_INVALID) {
283 dev_warn(nvmeq->q_dmadev,
284 "invalid id %d completed on queue %d\n",
285 cqe->command_id, le16_to_cpup(&cqe->sq_id));
288 dev_warn(nvmeq->q_dmadev, "Unknown special completion %p\n", ctx);
291 static void *cancel_cmd_info(struct nvme_cmd_info *cmd, nvme_completion_fn *fn)
298 cmd->fn = special_completion;
299 cmd->ctx = CMD_CTX_CANCELLED;
303 static void async_req_completion(struct nvme_queue *nvmeq, void *ctx,
304 struct nvme_completion *cqe)
306 u32 result = le32_to_cpup(&cqe->result);
307 u16 status = le16_to_cpup(&cqe->status) >> 1;
309 if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ)
310 ++nvmeq->dev->event_limit;
311 if (status != NVME_SC_SUCCESS)
314 switch (result & 0xff07) {
315 case NVME_AER_NOTICE_NS_CHANGED:
316 dev_info(nvmeq->q_dmadev, "rescanning\n");
317 schedule_work(&nvmeq->dev->scan_work);
319 dev_warn(nvmeq->q_dmadev, "async event result %08x\n", result);
323 static void abort_completion(struct nvme_queue *nvmeq, void *ctx,
324 struct nvme_completion *cqe)
326 struct request *req = ctx;
328 u16 status = le16_to_cpup(&cqe->status) >> 1;
329 u32 result = le32_to_cpup(&cqe->result);
331 blk_mq_free_request(req);
333 dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status, result);
334 ++nvmeq->dev->abort_limit;
337 static void async_completion(struct nvme_queue *nvmeq, void *ctx,
338 struct nvme_completion *cqe)
340 struct async_cmd_info *cmdinfo = ctx;
341 cmdinfo->result = le32_to_cpup(&cqe->result);
342 cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
343 queue_kthread_work(cmdinfo->worker, &cmdinfo->work);
344 blk_mq_free_request(cmdinfo->req);
347 static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq,
350 struct request *req = blk_mq_tag_to_rq(*nvmeq->tags, tag);
352 return blk_mq_rq_to_pdu(req);
356 * Called with local interrupts disabled and the q_lock held. May not sleep.
358 static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag,
359 nvme_completion_fn *fn)
361 struct nvme_cmd_info *cmd = get_cmd_from_tag(nvmeq, tag);
363 if (tag >= nvmeq->q_depth) {
364 *fn = special_completion;
365 return CMD_CTX_INVALID;
370 cmd->fn = special_completion;
371 cmd->ctx = CMD_CTX_COMPLETED;
376 * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
377 * @nvmeq: The queue to use
378 * @cmd: The command to send
380 * Safe to use from interrupt context
382 static int __nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
384 u16 tail = nvmeq->sq_tail;
386 memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
387 if (++tail == nvmeq->q_depth)
389 writel(tail, nvmeq->q_db);
390 nvmeq->sq_tail = tail;
395 static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
399 spin_lock_irqsave(&nvmeq->q_lock, flags);
400 ret = __nvme_submit_cmd(nvmeq, cmd);
401 spin_unlock_irqrestore(&nvmeq->q_lock, flags);
405 static __le64 **iod_list(struct nvme_iod *iod)
407 return ((void *)iod) + iod->offset;
410 static inline void iod_init(struct nvme_iod *iod, unsigned nbytes,
411 unsigned nseg, unsigned long private)
413 iod->private = private;
414 iod->offset = offsetof(struct nvme_iod, sg[nseg]);
416 iod->length = nbytes;
420 static struct nvme_iod *
421 __nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev,
422 unsigned long priv, gfp_t gfp)
424 struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) +
425 sizeof(__le64 *) * nvme_npages(bytes, dev) +
426 sizeof(struct scatterlist) * nseg, gfp);
429 iod_init(iod, bytes, nseg, priv);
434 static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev,
437 unsigned size = !(rq->cmd_flags & REQ_DISCARD) ? blk_rq_bytes(rq) :
438 sizeof(struct nvme_dsm_range);
439 struct nvme_iod *iod;
441 if (rq->nr_phys_segments <= NVME_INT_PAGES &&
442 size <= NVME_INT_BYTES(dev)) {
443 struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(rq);
446 iod_init(iod, size, rq->nr_phys_segments,
447 (unsigned long) rq | NVME_INT_MASK);
451 return __nvme_alloc_iod(rq->nr_phys_segments, size, dev,
452 (unsigned long) rq, gfp);
455 static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
457 const int last_prp = dev->page_size / 8 - 1;
459 __le64 **list = iod_list(iod);
460 dma_addr_t prp_dma = iod->first_dma;
462 if (iod->npages == 0)
463 dma_pool_free(dev->prp_small_pool, list[0], prp_dma);
464 for (i = 0; i < iod->npages; i++) {
465 __le64 *prp_list = list[i];
466 dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]);
467 dma_pool_free(dev->prp_page_pool, prp_list, prp_dma);
468 prp_dma = next_prp_dma;
471 if (iod_should_kfree(iod))
475 static int nvme_error_status(u16 status)
477 switch (status & 0x7ff) {
478 case NVME_SC_SUCCESS:
480 case NVME_SC_CAP_EXCEEDED:
487 #ifdef CONFIG_BLK_DEV_INTEGRITY
488 static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi)
490 if (be32_to_cpu(pi->ref_tag) == v)
491 pi->ref_tag = cpu_to_be32(p);
494 static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi)
496 if (be32_to_cpu(pi->ref_tag) == p)
497 pi->ref_tag = cpu_to_be32(v);
501 * nvme_dif_remap - remaps ref tags to bip seed and physical lba
503 * The virtual start sector is the one that was originally submitted by the
504 * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical
505 * start sector may be different. Remap protection information to match the
506 * physical LBA on writes, and back to the original seed on reads.
508 * Type 0 and 3 do not have a ref tag, so no remapping required.
510 static void nvme_dif_remap(struct request *req,
511 void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi))
513 struct nvme_ns *ns = req->rq_disk->private_data;
514 struct bio_integrity_payload *bip;
515 struct t10_pi_tuple *pi;
517 u32 i, nlb, ts, phys, virt;
519 if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3)
522 bip = bio_integrity(req->bio);
526 pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset;
529 virt = bip_get_seed(bip);
530 phys = nvme_block_nr(ns, blk_rq_pos(req));
531 nlb = (blk_rq_bytes(req) >> ns->lba_shift);
532 ts = ns->disk->integrity->tuple_size;
534 for (i = 0; i < nlb; i++, virt++, phys++) {
535 pi = (struct t10_pi_tuple *)p;
536 dif_swap(phys, virt, pi);
542 static int nvme_noop_verify(struct blk_integrity_iter *iter)
547 static int nvme_noop_generate(struct blk_integrity_iter *iter)
552 struct blk_integrity nvme_meta_noop = {
553 .name = "NVME_META_NOOP",
554 .generate_fn = nvme_noop_generate,
555 .verify_fn = nvme_noop_verify,
558 static void nvme_init_integrity(struct nvme_ns *ns)
560 struct blk_integrity integrity;
562 switch (ns->pi_type) {
563 case NVME_NS_DPS_PI_TYPE3:
564 integrity = t10_pi_type3_crc;
566 case NVME_NS_DPS_PI_TYPE1:
567 case NVME_NS_DPS_PI_TYPE2:
568 integrity = t10_pi_type1_crc;
571 integrity = nvme_meta_noop;
574 integrity.tuple_size = ns->ms;
575 blk_integrity_register(ns->disk, &integrity);
576 blk_queue_max_integrity_segments(ns->queue, 1);
578 #else /* CONFIG_BLK_DEV_INTEGRITY */
579 static void nvme_dif_remap(struct request *req,
580 void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi))
583 static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi)
586 static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi)
589 static void nvme_init_integrity(struct nvme_ns *ns)
594 static void req_completion(struct nvme_queue *nvmeq, void *ctx,
595 struct nvme_completion *cqe)
597 struct nvme_iod *iod = ctx;
598 struct request *req = iod_get_private(iod);
599 struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req);
601 u16 status = le16_to_cpup(&cqe->status) >> 1;
603 if (unlikely(status)) {
604 if (!(status & NVME_SC_DNR || blk_noretry_request(req))
605 && (jiffies - req->start_time) < req->timeout) {
608 blk_mq_requeue_request(req);
609 spin_lock_irqsave(req->q->queue_lock, flags);
610 if (!blk_queue_stopped(req->q))
611 blk_mq_kick_requeue_list(req->q);
612 spin_unlock_irqrestore(req->q->queue_lock, flags);
615 if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
616 if (cmd_rq->ctx == CMD_CTX_CANCELLED)
617 req->errors = -EINTR;
619 req->errors = status;
621 req->errors = nvme_error_status(status);
625 if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
626 u32 result = le32_to_cpup(&cqe->result);
627 req->special = (void *)(uintptr_t)result;
631 dev_warn(nvmeq->dev->dev,
632 "completing aborted command with status:%04x\n",
636 dma_unmap_sg(nvmeq->dev->dev, iod->sg, iod->nents,
637 rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
638 if (blk_integrity_rq(req)) {
639 if (!rq_data_dir(req))
640 nvme_dif_remap(req, nvme_dif_complete);
641 dma_unmap_sg(nvmeq->dev->dev, iod->meta_sg, 1,
642 rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
645 nvme_free_iod(nvmeq->dev, iod);
647 blk_mq_complete_request(req);
650 /* length is in bytes. gfp flags indicates whether we may sleep. */
651 static int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod,
652 int total_len, gfp_t gfp)
654 struct dma_pool *pool;
655 int length = total_len;
656 struct scatterlist *sg = iod->sg;
657 int dma_len = sg_dma_len(sg);
658 u64 dma_addr = sg_dma_address(sg);
659 u32 page_size = dev->page_size;
660 int offset = dma_addr & (page_size - 1);
662 __le64 **list = iod_list(iod);
666 length -= (page_size - offset);
670 dma_len -= (page_size - offset);
672 dma_addr += (page_size - offset);
675 dma_addr = sg_dma_address(sg);
676 dma_len = sg_dma_len(sg);
679 if (length <= page_size) {
680 iod->first_dma = dma_addr;
684 nprps = DIV_ROUND_UP(length, page_size);
685 if (nprps <= (256 / 8)) {
686 pool = dev->prp_small_pool;
689 pool = dev->prp_page_pool;
693 prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
695 iod->first_dma = dma_addr;
697 return (total_len - length) + page_size;
700 iod->first_dma = prp_dma;
703 if (i == page_size >> 3) {
704 __le64 *old_prp_list = prp_list;
705 prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
707 return total_len - length;
708 list[iod->npages++] = prp_list;
709 prp_list[0] = old_prp_list[i - 1];
710 old_prp_list[i - 1] = cpu_to_le64(prp_dma);
713 prp_list[i++] = cpu_to_le64(dma_addr);
714 dma_len -= page_size;
715 dma_addr += page_size;
723 dma_addr = sg_dma_address(sg);
724 dma_len = sg_dma_len(sg);
730 static void nvme_submit_priv(struct nvme_queue *nvmeq, struct request *req,
731 struct nvme_iod *iod)
733 struct nvme_command cmnd;
735 memcpy(&cmnd, req->cmd, sizeof(cmnd));
736 cmnd.rw.command_id = req->tag;
737 if (req->nr_phys_segments) {
738 cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
739 cmnd.rw.prp2 = cpu_to_le64(iod->first_dma);
742 __nvme_submit_cmd(nvmeq, &cmnd);
746 * We reuse the small pool to allocate the 16-byte range here as it is not
747 * worth having a special pool for these or additional cases to handle freeing
750 static void nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
751 struct request *req, struct nvme_iod *iod)
753 struct nvme_dsm_range *range =
754 (struct nvme_dsm_range *)iod_list(iod)[0];
755 struct nvme_command cmnd;
757 range->cattr = cpu_to_le32(0);
758 range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift);
759 range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
761 memset(&cmnd, 0, sizeof(cmnd));
762 cmnd.dsm.opcode = nvme_cmd_dsm;
763 cmnd.dsm.command_id = req->tag;
764 cmnd.dsm.nsid = cpu_to_le32(ns->ns_id);
765 cmnd.dsm.prp1 = cpu_to_le64(iod->first_dma);
767 cmnd.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
769 __nvme_submit_cmd(nvmeq, &cmnd);
772 static void nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns,
775 struct nvme_command cmnd;
777 memset(&cmnd, 0, sizeof(cmnd));
778 cmnd.common.opcode = nvme_cmd_flush;
779 cmnd.common.command_id = cmdid;
780 cmnd.common.nsid = cpu_to_le32(ns->ns_id);
782 __nvme_submit_cmd(nvmeq, &cmnd);
785 static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
788 struct request *req = iod_get_private(iod);
789 struct nvme_command cmnd;
793 if (req->cmd_flags & REQ_FUA)
794 control |= NVME_RW_FUA;
795 if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
796 control |= NVME_RW_LR;
798 if (req->cmd_flags & REQ_RAHEAD)
799 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
801 memset(&cmnd, 0, sizeof(cmnd));
802 cmnd.rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
803 cmnd.rw.command_id = req->tag;
804 cmnd.rw.nsid = cpu_to_le32(ns->ns_id);
805 cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
806 cmnd.rw.prp2 = cpu_to_le64(iod->first_dma);
807 cmnd.rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
808 cmnd.rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
810 if (blk_integrity_rq(req)) {
811 cmnd.rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg));
812 switch (ns->pi_type) {
813 case NVME_NS_DPS_PI_TYPE3:
814 control |= NVME_RW_PRINFO_PRCHK_GUARD;
816 case NVME_NS_DPS_PI_TYPE1:
817 case NVME_NS_DPS_PI_TYPE2:
818 control |= NVME_RW_PRINFO_PRCHK_GUARD |
819 NVME_RW_PRINFO_PRCHK_REF;
820 cmnd.rw.reftag = cpu_to_le32(
821 nvme_block_nr(ns, blk_rq_pos(req)));
825 control |= NVME_RW_PRINFO_PRACT;
827 cmnd.rw.control = cpu_to_le16(control);
828 cmnd.rw.dsmgmt = cpu_to_le32(dsmgmt);
830 __nvme_submit_cmd(nvmeq, &cmnd);
836 * NOTE: ns is NULL when called on the admin queue.
838 static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
839 const struct blk_mq_queue_data *bd)
841 struct nvme_ns *ns = hctx->queue->queuedata;
842 struct nvme_queue *nvmeq = hctx->driver_data;
843 struct nvme_dev *dev = nvmeq->dev;
844 struct request *req = bd->rq;
845 struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
846 struct nvme_iod *iod;
847 enum dma_data_direction dma_dir;
850 * If formated with metadata, require the block layer provide a buffer
851 * unless this namespace is formated such that the metadata can be
852 * stripped/generated by the controller with PRACT=1.
854 if (ns && ns->ms && !blk_integrity_rq(req)) {
855 if (!(ns->pi_type && ns->ms == 8) &&
856 req->cmd_type != REQ_TYPE_DRV_PRIV) {
857 req->errors = -EFAULT;
858 blk_mq_complete_request(req);
859 return BLK_MQ_RQ_QUEUE_OK;
863 iod = nvme_alloc_iod(req, dev, GFP_ATOMIC);
865 return BLK_MQ_RQ_QUEUE_BUSY;
867 if (req->cmd_flags & REQ_DISCARD) {
870 * We reuse the small pool to allocate the 16-byte range here
871 * as it is not worth having a special pool for these or
872 * additional cases to handle freeing the iod.
874 range = dma_pool_alloc(dev->prp_small_pool, GFP_ATOMIC,
878 iod_list(iod)[0] = (__le64 *)range;
880 } else if (req->nr_phys_segments) {
881 dma_dir = rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
883 sg_init_table(iod->sg, req->nr_phys_segments);
884 iod->nents = blk_rq_map_sg(req->q, req, iod->sg);
888 if (!dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents, dma_dir))
891 if (blk_rq_bytes(req) !=
892 nvme_setup_prps(dev, iod, blk_rq_bytes(req), GFP_ATOMIC)) {
893 dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
896 if (blk_integrity_rq(req)) {
897 if (blk_rq_count_integrity_sg(req->q, req->bio) != 1)
900 sg_init_table(iod->meta_sg, 1);
901 if (blk_rq_map_integrity_sg(
902 req->q, req->bio, iod->meta_sg) != 1)
905 if (rq_data_dir(req))
906 nvme_dif_remap(req, nvme_dif_prep);
908 if (!dma_map_sg(nvmeq->q_dmadev, iod->meta_sg, 1, dma_dir))
913 nvme_set_info(cmd, iod, req_completion);
914 spin_lock_irq(&nvmeq->q_lock);
915 if (req->cmd_type == REQ_TYPE_DRV_PRIV)
916 nvme_submit_priv(nvmeq, req, iod);
917 else if (req->cmd_flags & REQ_DISCARD)
918 nvme_submit_discard(nvmeq, ns, req, iod);
919 else if (req->cmd_flags & REQ_FLUSH)
920 nvme_submit_flush(nvmeq, ns, req->tag);
922 nvme_submit_iod(nvmeq, iod, ns);
924 nvme_process_cq(nvmeq);
925 spin_unlock_irq(&nvmeq->q_lock);
926 return BLK_MQ_RQ_QUEUE_OK;
929 nvme_free_iod(dev, iod);
930 return BLK_MQ_RQ_QUEUE_ERROR;
932 nvme_free_iod(dev, iod);
933 return BLK_MQ_RQ_QUEUE_BUSY;
936 static int nvme_process_cq(struct nvme_queue *nvmeq)
940 head = nvmeq->cq_head;
941 phase = nvmeq->cq_phase;
945 nvme_completion_fn fn;
946 struct nvme_completion cqe = nvmeq->cqes[head];
947 if ((le16_to_cpu(cqe.status) & 1) != phase)
949 nvmeq->sq_head = le16_to_cpu(cqe.sq_head);
950 if (++head == nvmeq->q_depth) {
954 ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn);
955 fn(nvmeq, ctx, &cqe);
958 /* If the controller ignores the cq head doorbell and continuously
959 * writes to the queue, it is theoretically possible to wrap around
960 * the queue twice and mistakenly return IRQ_NONE. Linux only
961 * requires that 0.1% of your interrupts are handled, so this isn't
964 if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
967 writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
968 nvmeq->cq_head = head;
969 nvmeq->cq_phase = phase;
975 static irqreturn_t nvme_irq(int irq, void *data)
978 struct nvme_queue *nvmeq = data;
979 spin_lock(&nvmeq->q_lock);
980 nvme_process_cq(nvmeq);
981 result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE;
983 spin_unlock(&nvmeq->q_lock);
987 static irqreturn_t nvme_irq_check(int irq, void *data)
989 struct nvme_queue *nvmeq = data;
990 struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head];
991 if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase)
993 return IRQ_WAKE_THREAD;
997 * Returns 0 on success. If the result is negative, it's a Linux error code;
998 * if the result is positive, it's an NVM Express status code
1000 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
1001 void *buffer, void __user *ubuffer, unsigned bufflen,
1002 u32 *result, unsigned timeout)
1004 bool write = cmd->common.opcode & 1;
1005 struct bio *bio = NULL;
1006 struct request *req;
1009 req = blk_mq_alloc_request(q, write, GFP_KERNEL, false);
1011 return PTR_ERR(req);
1013 req->cmd_type = REQ_TYPE_DRV_PRIV;
1014 req->cmd_flags |= REQ_FAILFAST_DRIVER;
1015 req->__data_len = 0;
1016 req->__sector = (sector_t) -1;
1017 req->bio = req->biotail = NULL;
1019 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
1021 req->cmd = (unsigned char *)cmd;
1022 req->cmd_len = sizeof(struct nvme_command);
1023 req->special = (void *)0;
1025 if (buffer && bufflen) {
1026 ret = blk_rq_map_kern(q, req, buffer, bufflen, __GFP_WAIT);
1029 } else if (ubuffer && bufflen) {
1030 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, __GFP_WAIT);
1036 blk_execute_rq(req->q, NULL, req, 0);
1038 blk_rq_unmap_user(bio);
1040 *result = (u32)(uintptr_t)req->special;
1043 blk_mq_free_request(req);
1047 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
1048 void *buffer, unsigned bufflen)
1050 return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen, NULL, 0);
1053 static int nvme_submit_async_admin_req(struct nvme_dev *dev)
1055 struct nvme_queue *nvmeq = dev->queues[0];
1056 struct nvme_command c;
1057 struct nvme_cmd_info *cmd_info;
1058 struct request *req;
1060 req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC, true);
1062 return PTR_ERR(req);
1064 req->cmd_flags |= REQ_NO_TIMEOUT;
1065 cmd_info = blk_mq_rq_to_pdu(req);
1066 nvme_set_info(cmd_info, NULL, async_req_completion);
1068 memset(&c, 0, sizeof(c));
1069 c.common.opcode = nvme_admin_async_event;
1070 c.common.command_id = req->tag;
1072 blk_mq_free_request(req);
1073 return __nvme_submit_cmd(nvmeq, &c);
1076 static int nvme_submit_admin_async_cmd(struct nvme_dev *dev,
1077 struct nvme_command *cmd,
1078 struct async_cmd_info *cmdinfo, unsigned timeout)
1080 struct nvme_queue *nvmeq = dev->queues[0];
1081 struct request *req;
1082 struct nvme_cmd_info *cmd_rq;
1084 req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_KERNEL, false);
1086 return PTR_ERR(req);
1088 req->timeout = timeout;
1089 cmd_rq = blk_mq_rq_to_pdu(req);
1091 nvme_set_info(cmd_rq, cmdinfo, async_completion);
1092 cmdinfo->status = -EINTR;
1094 cmd->common.command_id = req->tag;
1096 return nvme_submit_cmd(nvmeq, cmd);
1099 static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
1101 struct nvme_command c;
1103 memset(&c, 0, sizeof(c));
1104 c.delete_queue.opcode = opcode;
1105 c.delete_queue.qid = cpu_to_le16(id);
1107 return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0);
1110 static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
1111 struct nvme_queue *nvmeq)
1113 struct nvme_command c;
1114 int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED;
1117 * Note: we (ab)use the fact the the prp fields survive if no data
1118 * is attached to the request.
1120 memset(&c, 0, sizeof(c));
1121 c.create_cq.opcode = nvme_admin_create_cq;
1122 c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr);
1123 c.create_cq.cqid = cpu_to_le16(qid);
1124 c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
1125 c.create_cq.cq_flags = cpu_to_le16(flags);
1126 c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector);
1128 return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0);
1131 static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
1132 struct nvme_queue *nvmeq)
1134 struct nvme_command c;
1135 int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM;
1138 * Note: we (ab)use the fact the the prp fields survive if no data
1139 * is attached to the request.
1141 memset(&c, 0, sizeof(c));
1142 c.create_sq.opcode = nvme_admin_create_sq;
1143 c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr);
1144 c.create_sq.sqid = cpu_to_le16(qid);
1145 c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
1146 c.create_sq.sq_flags = cpu_to_le16(flags);
1147 c.create_sq.cqid = cpu_to_le16(qid);
1149 return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0);
1152 static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid)
1154 return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid);
1157 static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid)
1159 return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid);
1162 int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id)
1164 struct nvme_command c = { };
1167 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1168 c.identify.opcode = nvme_admin_identify;
1169 c.identify.cns = cpu_to_le32(1);
1171 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
1175 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
1176 sizeof(struct nvme_id_ctrl));
1182 int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid,
1183 struct nvme_id_ns **id)
1185 struct nvme_command c = { };
1188 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1189 c.identify.opcode = nvme_admin_identify,
1190 c.identify.nsid = cpu_to_le32(nsid),
1192 *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
1196 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
1197 sizeof(struct nvme_id_ns));
1203 int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
1204 dma_addr_t dma_addr, u32 *result)
1206 struct nvme_command c;
1208 memset(&c, 0, sizeof(c));
1209 c.features.opcode = nvme_admin_get_features;
1210 c.features.nsid = cpu_to_le32(nsid);
1211 c.features.prp1 = cpu_to_le64(dma_addr);
1212 c.features.fid = cpu_to_le32(fid);
1214 return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
1218 int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
1219 dma_addr_t dma_addr, u32 *result)
1221 struct nvme_command c;
1223 memset(&c, 0, sizeof(c));
1224 c.features.opcode = nvme_admin_set_features;
1225 c.features.prp1 = cpu_to_le64(dma_addr);
1226 c.features.fid = cpu_to_le32(fid);
1227 c.features.dword11 = cpu_to_le32(dword11);
1229 return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
1233 int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log)
1235 struct nvme_command c = { };
1238 c.common.opcode = nvme_admin_get_log_page,
1239 c.common.nsid = cpu_to_le32(0xFFFFFFFF),
1240 c.common.cdw10[0] = cpu_to_le32(
1241 (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
1244 *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
1248 error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
1249 sizeof(struct nvme_smart_log));
1256 * nvme_abort_req - Attempt aborting a request
1258 * Schedule controller reset if the command was already aborted once before and
1259 * still hasn't been returned to the driver, or if this is the admin queue.
1261 static void nvme_abort_req(struct request *req)
1263 struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req);
1264 struct nvme_queue *nvmeq = cmd_rq->nvmeq;
1265 struct nvme_dev *dev = nvmeq->dev;
1266 struct request *abort_req;
1267 struct nvme_cmd_info *abort_cmd;
1268 struct nvme_command cmd;
1270 if (!nvmeq->qid || cmd_rq->aborted) {
1271 unsigned long flags;
1273 spin_lock_irqsave(&dev_list_lock, flags);
1274 if (work_busy(&dev->reset_work))
1276 list_del_init(&dev->node);
1277 dev_warn(dev->dev, "I/O %d QID %d timeout, reset controller\n",
1278 req->tag, nvmeq->qid);
1279 dev->reset_workfn = nvme_reset_failed_dev;
1280 queue_work(nvme_workq, &dev->reset_work);
1282 spin_unlock_irqrestore(&dev_list_lock, flags);
1286 if (!dev->abort_limit)
1289 abort_req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC,
1291 if (IS_ERR(abort_req))
1294 abort_cmd = blk_mq_rq_to_pdu(abort_req);
1295 nvme_set_info(abort_cmd, abort_req, abort_completion);
1297 memset(&cmd, 0, sizeof(cmd));
1298 cmd.abort.opcode = nvme_admin_abort_cmd;
1299 cmd.abort.cid = req->tag;
1300 cmd.abort.sqid = cpu_to_le16(nvmeq->qid);
1301 cmd.abort.command_id = abort_req->tag;
1304 cmd_rq->aborted = 1;
1306 dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", req->tag,
1308 if (nvme_submit_cmd(dev->queues[0], &cmd) < 0) {
1309 dev_warn(nvmeq->q_dmadev,
1310 "Could not abort I/O %d QID %d",
1311 req->tag, nvmeq->qid);
1312 blk_mq_free_request(abort_req);
1316 static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved)
1318 struct nvme_queue *nvmeq = data;
1320 nvme_completion_fn fn;
1321 struct nvme_cmd_info *cmd;
1322 struct nvme_completion cqe;
1324 if (!blk_mq_request_started(req))
1327 cmd = blk_mq_rq_to_pdu(req);
1329 if (cmd->ctx == CMD_CTX_CANCELLED)
1332 if (blk_queue_dying(req->q))
1333 cqe.status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1);
1335 cqe.status = cpu_to_le16(NVME_SC_ABORT_REQ << 1);
1338 dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n",
1339 req->tag, nvmeq->qid);
1340 ctx = cancel_cmd_info(cmd, &fn);
1341 fn(nvmeq, ctx, &cqe);
1344 static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
1346 struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
1347 struct nvme_queue *nvmeq = cmd->nvmeq;
1349 dev_warn(nvmeq->q_dmadev, "Timeout I/O %d QID %d\n", req->tag,
1351 spin_lock_irq(&nvmeq->q_lock);
1352 nvme_abort_req(req);
1353 spin_unlock_irq(&nvmeq->q_lock);
1356 * The aborted req will be completed on receiving the abort req.
1357 * We enable the timer again. If hit twice, it'll cause a device reset,
1358 * as the device then is in a faulty state.
1360 return BLK_EH_RESET_TIMER;
1363 static void nvme_free_queue(struct nvme_queue *nvmeq)
1365 dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
1366 (void *)nvmeq->cqes, nvmeq->cq_dma_addr);
1367 dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
1368 nvmeq->sq_cmds, nvmeq->sq_dma_addr);
1372 static void nvme_free_queues(struct nvme_dev *dev, int lowest)
1376 for (i = dev->queue_count - 1; i >= lowest; i--) {
1377 struct nvme_queue *nvmeq = dev->queues[i];
1379 dev->queues[i] = NULL;
1380 nvme_free_queue(nvmeq);
1385 * nvme_suspend_queue - put queue into suspended state
1386 * @nvmeq - queue to suspend
1388 static int nvme_suspend_queue(struct nvme_queue *nvmeq)
1392 spin_lock_irq(&nvmeq->q_lock);
1393 if (nvmeq->cq_vector == -1) {
1394 spin_unlock_irq(&nvmeq->q_lock);
1397 vector = nvmeq->dev->entry[nvmeq->cq_vector].vector;
1398 nvmeq->dev->online_queues--;
1399 nvmeq->cq_vector = -1;
1400 spin_unlock_irq(&nvmeq->q_lock);
1402 if (!nvmeq->qid && nvmeq->dev->admin_q)
1403 blk_mq_freeze_queue_start(nvmeq->dev->admin_q);
1405 irq_set_affinity_hint(vector, NULL);
1406 free_irq(vector, nvmeq);
1411 static void nvme_clear_queue(struct nvme_queue *nvmeq)
1413 spin_lock_irq(&nvmeq->q_lock);
1414 if (nvmeq->tags && *nvmeq->tags)
1415 blk_mq_all_tag_busy_iter(*nvmeq->tags, nvme_cancel_queue_ios, nvmeq);
1416 spin_unlock_irq(&nvmeq->q_lock);
1419 static void nvme_disable_queue(struct nvme_dev *dev, int qid)
1421 struct nvme_queue *nvmeq = dev->queues[qid];
1425 if (nvme_suspend_queue(nvmeq))
1428 /* Don't tell the adapter to delete the admin queue.
1429 * Don't tell a removed adapter to delete IO queues. */
1430 if (qid && readl(&dev->bar->csts) != -1) {
1431 adapter_delete_sq(dev, qid);
1432 adapter_delete_cq(dev, qid);
1435 spin_lock_irq(&nvmeq->q_lock);
1436 nvme_process_cq(nvmeq);
1437 spin_unlock_irq(&nvmeq->q_lock);
1440 static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
1443 struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL);
1447 nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth),
1448 &nvmeq->cq_dma_addr, GFP_KERNEL);
1452 nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth),
1453 &nvmeq->sq_dma_addr, GFP_KERNEL);
1454 if (!nvmeq->sq_cmds)
1457 nvmeq->q_dmadev = dev->dev;
1459 snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d",
1460 dev->instance, qid);
1461 spin_lock_init(&nvmeq->q_lock);
1463 nvmeq->cq_phase = 1;
1464 nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
1465 nvmeq->q_depth = depth;
1467 nvmeq->cq_vector = -1;
1468 dev->queues[qid] = nvmeq;
1470 /* make sure queue descriptor is set before queue count, for kthread */
1477 dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes,
1478 nvmeq->cq_dma_addr);
1484 static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq,
1487 if (use_threaded_interrupts)
1488 return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector,
1489 nvme_irq_check, nvme_irq, IRQF_SHARED,
1491 return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq,
1492 IRQF_SHARED, name, nvmeq);
1495 static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
1497 struct nvme_dev *dev = nvmeq->dev;
1499 spin_lock_irq(&nvmeq->q_lock);
1502 nvmeq->cq_phase = 1;
1503 nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
1504 memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
1505 dev->online_queues++;
1506 spin_unlock_irq(&nvmeq->q_lock);
1509 static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
1511 struct nvme_dev *dev = nvmeq->dev;
1514 nvmeq->cq_vector = qid - 1;
1515 result = adapter_alloc_cq(dev, qid, nvmeq);
1519 result = adapter_alloc_sq(dev, qid, nvmeq);
1523 result = queue_request_irq(dev, nvmeq, nvmeq->irqname);
1527 nvme_init_queue(nvmeq, qid);
1531 adapter_delete_sq(dev, qid);
1533 adapter_delete_cq(dev, qid);
1537 static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled)
1539 unsigned long timeout;
1540 u32 bit = enabled ? NVME_CSTS_RDY : 0;
1542 timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
1544 while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) {
1546 if (fatal_signal_pending(current))
1548 if (time_after(jiffies, timeout)) {
1550 "Device not ready; aborting %s\n", enabled ?
1551 "initialisation" : "reset");
1560 * If the device has been passed off to us in an enabled state, just clear
1561 * the enabled bit. The spec says we should set the 'shutdown notification
1562 * bits', but doing so may cause the device to complete commands to the
1563 * admin queue ... and we don't know what memory that might be pointing at!
1565 static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap)
1567 dev->ctrl_config &= ~NVME_CC_SHN_MASK;
1568 dev->ctrl_config &= ~NVME_CC_ENABLE;
1569 writel(dev->ctrl_config, &dev->bar->cc);
1571 return nvme_wait_ready(dev, cap, false);
1574 static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap)
1576 dev->ctrl_config &= ~NVME_CC_SHN_MASK;
1577 dev->ctrl_config |= NVME_CC_ENABLE;
1578 writel(dev->ctrl_config, &dev->bar->cc);
1580 return nvme_wait_ready(dev, cap, true);
1583 static int nvme_shutdown_ctrl(struct nvme_dev *dev)
1585 unsigned long timeout;
1587 dev->ctrl_config &= ~NVME_CC_SHN_MASK;
1588 dev->ctrl_config |= NVME_CC_SHN_NORMAL;
1590 writel(dev->ctrl_config, &dev->bar->cc);
1592 timeout = SHUTDOWN_TIMEOUT + jiffies;
1593 while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) !=
1594 NVME_CSTS_SHST_CMPLT) {
1596 if (fatal_signal_pending(current))
1598 if (time_after(jiffies, timeout)) {
1600 "Device shutdown incomplete; abort shutdown\n");
1608 static struct blk_mq_ops nvme_mq_admin_ops = {
1609 .queue_rq = nvme_queue_rq,
1610 .map_queue = blk_mq_map_queue,
1611 .init_hctx = nvme_admin_init_hctx,
1612 .exit_hctx = nvme_admin_exit_hctx,
1613 .init_request = nvme_admin_init_request,
1614 .timeout = nvme_timeout,
1617 static struct blk_mq_ops nvme_mq_ops = {
1618 .queue_rq = nvme_queue_rq,
1619 .map_queue = blk_mq_map_queue,
1620 .init_hctx = nvme_init_hctx,
1621 .init_request = nvme_init_request,
1622 .timeout = nvme_timeout,
1625 static void nvme_dev_remove_admin(struct nvme_dev *dev)
1627 if (dev->admin_q && !blk_queue_dying(dev->admin_q)) {
1628 blk_cleanup_queue(dev->admin_q);
1629 blk_mq_free_tag_set(&dev->admin_tagset);
1633 static int nvme_alloc_admin_tags(struct nvme_dev *dev)
1635 if (!dev->admin_q) {
1636 dev->admin_tagset.ops = &nvme_mq_admin_ops;
1637 dev->admin_tagset.nr_hw_queues = 1;
1638 dev->admin_tagset.queue_depth = NVME_AQ_DEPTH - 1;
1639 dev->admin_tagset.reserved_tags = 1;
1640 dev->admin_tagset.timeout = ADMIN_TIMEOUT;
1641 dev->admin_tagset.numa_node = dev_to_node(dev->dev);
1642 dev->admin_tagset.cmd_size = nvme_cmd_size(dev);
1643 dev->admin_tagset.driver_data = dev;
1645 if (blk_mq_alloc_tag_set(&dev->admin_tagset))
1648 dev->admin_q = blk_mq_init_queue(&dev->admin_tagset);
1649 if (IS_ERR(dev->admin_q)) {
1650 blk_mq_free_tag_set(&dev->admin_tagset);
1653 if (!blk_get_queue(dev->admin_q)) {
1654 nvme_dev_remove_admin(dev);
1655 dev->admin_q = NULL;
1659 blk_mq_unfreeze_queue(dev->admin_q);
1664 static int nvme_configure_admin_queue(struct nvme_dev *dev)
1668 u64 cap = readq(&dev->bar->cap);
1669 struct nvme_queue *nvmeq;
1670 unsigned page_shift = PAGE_SHIFT;
1671 unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12;
1672 unsigned dev_page_max = NVME_CAP_MPSMAX(cap) + 12;
1674 if (page_shift < dev_page_min) {
1676 "Minimum device page size (%u) too large for "
1677 "host (%u)\n", 1 << dev_page_min,
1681 if (page_shift > dev_page_max) {
1683 "Device maximum page size (%u) smaller than "
1684 "host (%u); enabling work-around\n",
1685 1 << dev_page_max, 1 << page_shift);
1686 page_shift = dev_page_max;
1689 result = nvme_disable_ctrl(dev, cap);
1693 nvmeq = dev->queues[0];
1695 nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH);
1700 aqa = nvmeq->q_depth - 1;
1703 dev->page_size = 1 << page_shift;
1705 dev->ctrl_config = NVME_CC_CSS_NVM;
1706 dev->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1707 dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
1708 dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
1710 writel(aqa, &dev->bar->aqa);
1711 writeq(nvmeq->sq_dma_addr, &dev->bar->asq);
1712 writeq(nvmeq->cq_dma_addr, &dev->bar->acq);
1714 result = nvme_enable_ctrl(dev, cap);
1718 nvmeq->cq_vector = 0;
1719 result = queue_request_irq(dev, nvmeq, nvmeq->irqname);
1721 nvmeq->cq_vector = -1;
1728 nvme_free_queues(dev, 0);
1732 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
1734 struct nvme_dev *dev = ns->dev;
1735 struct nvme_user_io io;
1736 struct nvme_command c;
1737 unsigned length, meta_len;
1739 dma_addr_t meta_dma = 0;
1741 void __user *metadata;
1743 if (copy_from_user(&io, uio, sizeof(io)))
1746 switch (io.opcode) {
1747 case nvme_cmd_write:
1749 case nvme_cmd_compare:
1755 length = (io.nblocks + 1) << ns->lba_shift;
1756 meta_len = (io.nblocks + 1) * ns->ms;
1757 metadata = (void __user *)(unsigned long)io.metadata;
1758 write = io.opcode & 1;
1765 if (((io.metadata & 3) || !io.metadata) && !ns->ext)
1768 meta = dma_alloc_coherent(dev->dev, meta_len,
1769 &meta_dma, GFP_KERNEL);
1776 if (copy_from_user(meta, metadata, meta_len)) {
1783 memset(&c, 0, sizeof(c));
1784 c.rw.opcode = io.opcode;
1785 c.rw.flags = io.flags;
1786 c.rw.nsid = cpu_to_le32(ns->ns_id);
1787 c.rw.slba = cpu_to_le64(io.slba);
1788 c.rw.length = cpu_to_le16(io.nblocks);
1789 c.rw.control = cpu_to_le16(io.control);
1790 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
1791 c.rw.reftag = cpu_to_le32(io.reftag);
1792 c.rw.apptag = cpu_to_le16(io.apptag);
1793 c.rw.appmask = cpu_to_le16(io.appmask);
1794 c.rw.metadata = cpu_to_le64(meta_dma);
1796 status = __nvme_submit_sync_cmd(ns->queue, &c, NULL,
1797 (void __user *)io.addr, length, NULL, 0);
1800 if (status == NVME_SC_SUCCESS && !write) {
1801 if (copy_to_user(metadata, meta, meta_len))
1804 dma_free_coherent(dev->dev, meta_len, meta, meta_dma);
1809 static int nvme_user_cmd(struct nvme_dev *dev, struct nvme_ns *ns,
1810 struct nvme_passthru_cmd __user *ucmd)
1812 struct nvme_passthru_cmd cmd;
1813 struct nvme_command c;
1814 unsigned timeout = 0;
1817 if (!capable(CAP_SYS_ADMIN))
1819 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1822 memset(&c, 0, sizeof(c));
1823 c.common.opcode = cmd.opcode;
1824 c.common.flags = cmd.flags;
1825 c.common.nsid = cpu_to_le32(cmd.nsid);
1826 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1827 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1828 c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
1829 c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
1830 c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
1831 c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
1832 c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
1833 c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
1836 timeout = msecs_to_jiffies(cmd.timeout_ms);
1838 status = __nvme_submit_sync_cmd(ns ? ns->queue : dev->admin_q, &c,
1839 NULL, (void __user *)cmd.addr, cmd.data_len,
1840 &cmd.result, timeout);
1842 if (put_user(cmd.result, &ucmd->result))
1849 static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
1852 struct nvme_ns *ns = bdev->bd_disk->private_data;
1856 force_successful_syscall_return();
1858 case NVME_IOCTL_ADMIN_CMD:
1859 return nvme_user_cmd(ns->dev, NULL, (void __user *)arg);
1860 case NVME_IOCTL_IO_CMD:
1861 return nvme_user_cmd(ns->dev, ns, (void __user *)arg);
1862 case NVME_IOCTL_SUBMIT_IO:
1863 return nvme_submit_io(ns, (void __user *)arg);
1864 case SG_GET_VERSION_NUM:
1865 return nvme_sg_get_version_num((void __user *)arg);
1867 return nvme_sg_io(ns, (void __user *)arg);
1873 #ifdef CONFIG_COMPAT
1874 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
1875 unsigned int cmd, unsigned long arg)
1879 return -ENOIOCTLCMD;
1881 return nvme_ioctl(bdev, mode, cmd, arg);
1884 #define nvme_compat_ioctl NULL
1887 static int nvme_open(struct block_device *bdev, fmode_t mode)
1892 spin_lock(&dev_list_lock);
1893 ns = bdev->bd_disk->private_data;
1896 else if (!kref_get_unless_zero(&ns->dev->kref))
1898 spin_unlock(&dev_list_lock);
1903 static void nvme_free_dev(struct kref *kref);
1905 static void nvme_release(struct gendisk *disk, fmode_t mode)
1907 struct nvme_ns *ns = disk->private_data;
1908 struct nvme_dev *dev = ns->dev;
1910 kref_put(&dev->kref, nvme_free_dev);
1913 static int nvme_getgeo(struct block_device *bd, struct hd_geometry *geo)
1915 /* some standard values */
1916 geo->heads = 1 << 6;
1917 geo->sectors = 1 << 5;
1918 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
1922 static void nvme_config_discard(struct nvme_ns *ns)
1924 u32 logical_block_size = queue_logical_block_size(ns->queue);
1925 ns->queue->limits.discard_zeroes_data = 0;
1926 ns->queue->limits.discard_alignment = logical_block_size;
1927 ns->queue->limits.discard_granularity = logical_block_size;
1928 blk_queue_max_discard_sectors(ns->queue, 0xffffffff);
1929 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
1932 static int nvme_revalidate_disk(struct gendisk *disk)
1934 struct nvme_ns *ns = disk->private_data;
1935 struct nvme_dev *dev = ns->dev;
1936 struct nvme_id_ns *id;
1941 if (nvme_identify_ns(dev, ns->ns_id, &id)) {
1942 dev_warn(dev->dev, "%s: Identify failure nvme%dn%d\n", __func__,
1943 dev->instance, ns->ns_id);
1946 if (id->ncap == 0) {
1952 lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
1953 ns->lba_shift = id->lbaf[lbaf].ds;
1954 ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
1955 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
1958 * If identify namespace failed, use default 512 byte block size so
1959 * block layer can use before failing read/write for 0 capacity.
1961 if (ns->lba_shift == 0)
1963 bs = 1 << ns->lba_shift;
1965 /* XXX: PI implementation requires metadata equal t10 pi tuple size */
1966 pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
1967 id->dps & NVME_NS_DPS_PI_MASK : 0;
1969 if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
1971 bs != queue_logical_block_size(disk->queue) ||
1972 (ns->ms && ns->ext)))
1973 blk_integrity_unregister(disk);
1975 ns->pi_type = pi_type;
1976 blk_queue_logical_block_size(ns->queue, bs);
1978 if (ns->ms && !blk_get_integrity(disk) && (disk->flags & GENHD_FL_UP) &&
1980 nvme_init_integrity(ns);
1982 if (ns->ms && !blk_get_integrity(disk))
1983 set_capacity(disk, 0);
1985 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
1987 if (dev->oncs & NVME_CTRL_ONCS_DSM)
1988 nvme_config_discard(ns);
1994 static const struct block_device_operations nvme_fops = {
1995 .owner = THIS_MODULE,
1996 .ioctl = nvme_ioctl,
1997 .compat_ioctl = nvme_compat_ioctl,
1999 .release = nvme_release,
2000 .getgeo = nvme_getgeo,
2001 .revalidate_disk= nvme_revalidate_disk,
2004 static int nvme_kthread(void *data)
2006 struct nvme_dev *dev, *next;
2008 while (!kthread_should_stop()) {
2009 set_current_state(TASK_INTERRUPTIBLE);
2010 spin_lock(&dev_list_lock);
2011 list_for_each_entry_safe(dev, next, &dev_list, node) {
2013 if (readl(&dev->bar->csts) & NVME_CSTS_CFS) {
2014 if (work_busy(&dev->reset_work))
2016 list_del_init(&dev->node);
2018 "Failed status: %x, reset controller\n",
2019 readl(&dev->bar->csts));
2020 dev->reset_workfn = nvme_reset_failed_dev;
2021 queue_work(nvme_workq, &dev->reset_work);
2024 for (i = 0; i < dev->queue_count; i++) {
2025 struct nvme_queue *nvmeq = dev->queues[i];
2028 spin_lock_irq(&nvmeq->q_lock);
2029 nvme_process_cq(nvmeq);
2031 while ((i == 0) && (dev->event_limit > 0)) {
2032 if (nvme_submit_async_admin_req(dev))
2036 spin_unlock_irq(&nvmeq->q_lock);
2039 spin_unlock(&dev_list_lock);
2040 schedule_timeout(round_jiffies_relative(HZ));
2045 static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
2048 struct gendisk *disk;
2049 int node = dev_to_node(dev->dev);
2051 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
2055 ns->queue = blk_mq_init_queue(&dev->tagset);
2056 if (IS_ERR(ns->queue))
2058 queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue);
2059 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
2060 queue_flag_set_unlocked(QUEUE_FLAG_SG_GAPS, ns->queue);
2062 ns->queue->queuedata = ns;
2064 disk = alloc_disk_node(0, node);
2066 goto out_free_queue;
2070 ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
2071 list_add_tail(&ns->list, &dev->namespaces);
2073 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
2074 if (dev->max_hw_sectors)
2075 blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
2076 if (dev->stripe_size)
2077 blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9);
2078 if (dev->vwc & NVME_CTRL_VWC_PRESENT)
2079 blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA);
2081 disk->major = nvme_major;
2082 disk->first_minor = 0;
2083 disk->fops = &nvme_fops;
2084 disk->private_data = ns;
2085 disk->queue = ns->queue;
2086 disk->driverfs_dev = dev->device;
2087 disk->flags = GENHD_FL_EXT_DEVT;
2088 sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid);
2091 * Initialize capacity to 0 until we establish the namespace format and
2092 * setup integrity extentions if necessary. The revalidate_disk after
2093 * add_disk allows the driver to register with integrity if the format
2096 set_capacity(disk, 0);
2097 if (nvme_revalidate_disk(ns->disk))
2102 struct block_device *bd = bdget_disk(ns->disk, 0);
2105 if (blkdev_get(bd, FMODE_READ, NULL)) {
2109 blkdev_reread_part(bd);
2110 blkdev_put(bd, FMODE_READ);
2115 list_del(&ns->list);
2117 blk_cleanup_queue(ns->queue);
2122 static void nvme_create_io_queues(struct nvme_dev *dev)
2126 for (i = dev->queue_count; i <= dev->max_qid; i++)
2127 if (!nvme_alloc_queue(dev, i, dev->q_depth))
2130 for (i = dev->online_queues; i <= dev->queue_count - 1; i++)
2131 if (nvme_create_queue(dev->queues[i], i))
2135 static int set_queue_count(struct nvme_dev *dev, int count)
2139 u32 q_count = (count - 1) | ((count - 1) << 16);
2141 status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0,
2146 dev_err(dev->dev, "Could not set queue count (%d)\n", status);
2149 return min(result & 0xffff, result >> 16) + 1;
2152 static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
2154 return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride);
2157 static int nvme_setup_io_queues(struct nvme_dev *dev)
2159 struct nvme_queue *adminq = dev->queues[0];
2160 struct pci_dev *pdev = to_pci_dev(dev->dev);
2161 int result, i, vecs, nr_io_queues, size;
2163 nr_io_queues = num_possible_cpus();
2164 result = set_queue_count(dev, nr_io_queues);
2167 if (result < nr_io_queues)
2168 nr_io_queues = result;
2170 size = db_bar_size(dev, nr_io_queues);
2174 dev->bar = ioremap(pci_resource_start(pdev, 0), size);
2177 if (!--nr_io_queues)
2179 size = db_bar_size(dev, nr_io_queues);
2181 dev->dbs = ((void __iomem *)dev->bar) + 4096;
2182 adminq->q_db = dev->dbs;
2185 /* Deregister the admin queue's interrupt */
2186 free_irq(dev->entry[0].vector, adminq);
2189 * If we enable msix early due to not intx, disable it again before
2190 * setting up the full range we need.
2193 pci_disable_msix(pdev);
2195 for (i = 0; i < nr_io_queues; i++)
2196 dev->entry[i].entry = i;
2197 vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues);
2199 vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32));
2203 for (i = 0; i < vecs; i++)
2204 dev->entry[i].vector = i + pdev->irq;
2209 * Should investigate if there's a performance win from allocating
2210 * more queues than interrupt vectors; it might allow the submission
2211 * path to scale better, even if the receive path is limited by the
2212 * number of interrupts.
2214 nr_io_queues = vecs;
2215 dev->max_qid = nr_io_queues;
2217 result = queue_request_irq(dev, adminq, adminq->irqname);
2219 adminq->cq_vector = -1;
2223 /* Free previously allocated queues that are no longer usable */
2224 nvme_free_queues(dev, nr_io_queues + 1);
2225 nvme_create_io_queues(dev);
2230 nvme_free_queues(dev, 1);
2234 static void nvme_free_namespace(struct nvme_ns *ns)
2236 list_del(&ns->list);
2238 spin_lock(&dev_list_lock);
2239 ns->disk->private_data = NULL;
2240 spin_unlock(&dev_list_lock);
2246 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
2248 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
2249 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
2251 return nsa->ns_id - nsb->ns_id;
2254 static struct nvme_ns *nvme_find_ns(struct nvme_dev *dev, unsigned nsid)
2258 list_for_each_entry(ns, &dev->namespaces, list) {
2259 if (ns->ns_id == nsid)
2261 if (ns->ns_id > nsid)
2267 static inline bool nvme_io_incapable(struct nvme_dev *dev)
2269 return (!dev->bar || readl(&dev->bar->csts) & NVME_CSTS_CFS ||
2270 dev->online_queues < 2);
2273 static void nvme_ns_remove(struct nvme_ns *ns)
2275 bool kill = nvme_io_incapable(ns->dev) && !blk_queue_dying(ns->queue);
2278 blk_set_queue_dying(ns->queue);
2279 if (ns->disk->flags & GENHD_FL_UP) {
2280 if (blk_get_integrity(ns->disk))
2281 blk_integrity_unregister(ns->disk);
2282 del_gendisk(ns->disk);
2284 if (kill || !blk_queue_dying(ns->queue)) {
2285 blk_mq_abort_requeue_list(ns->queue);
2286 blk_cleanup_queue(ns->queue);
2290 static void nvme_scan_namespaces(struct nvme_dev *dev, unsigned nn)
2292 struct nvme_ns *ns, *next;
2295 for (i = 1; i <= nn; i++) {
2296 ns = nvme_find_ns(dev, i);
2298 if (revalidate_disk(ns->disk)) {
2300 nvme_free_namespace(ns);
2303 nvme_alloc_ns(dev, i);
2305 list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
2306 if (ns->ns_id > nn) {
2308 nvme_free_namespace(ns);
2311 list_sort(NULL, &dev->namespaces, ns_cmp);
2314 static void nvme_dev_scan(struct work_struct *work)
2316 struct nvme_dev *dev = container_of(work, struct nvme_dev, scan_work);
2317 struct nvme_id_ctrl *ctrl;
2319 if (!dev->tagset.tags)
2321 if (nvme_identify_ctrl(dev, &ctrl))
2323 nvme_scan_namespaces(dev, le32_to_cpup(&ctrl->nn));
2328 * Return: error value if an error occurred setting up the queues or calling
2329 * Identify Device. 0 if these succeeded, even if adding some of the
2330 * namespaces failed. At the moment, these failures are silent. TBD which
2331 * failures should be reported.
2333 static int nvme_dev_add(struct nvme_dev *dev)
2335 struct pci_dev *pdev = to_pci_dev(dev->dev);
2338 struct nvme_id_ctrl *ctrl;
2339 int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12;
2341 res = nvme_identify_ctrl(dev, &ctrl);
2343 dev_err(dev->dev, "Identify Controller failed (%d)\n", res);
2347 nn = le32_to_cpup(&ctrl->nn);
2348 dev->oncs = le16_to_cpup(&ctrl->oncs);
2349 dev->abort_limit = ctrl->acl + 1;
2350 dev->vwc = ctrl->vwc;
2351 memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
2352 memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
2353 memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
2355 dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9);
2356 if ((pdev->vendor == PCI_VENDOR_ID_INTEL) &&
2357 (pdev->device == 0x0953) && ctrl->vs[3]) {
2358 unsigned int max_hw_sectors;
2360 dev->stripe_size = 1 << (ctrl->vs[3] + shift);
2361 max_hw_sectors = dev->stripe_size >> (shift - 9);
2362 if (dev->max_hw_sectors) {
2363 dev->max_hw_sectors = min(max_hw_sectors,
2364 dev->max_hw_sectors);
2366 dev->max_hw_sectors = max_hw_sectors;
2370 if (!dev->tagset.tags) {
2371 dev->tagset.ops = &nvme_mq_ops;
2372 dev->tagset.nr_hw_queues = dev->online_queues - 1;
2373 dev->tagset.timeout = NVME_IO_TIMEOUT;
2374 dev->tagset.numa_node = dev_to_node(dev->dev);
2375 dev->tagset.queue_depth =
2376 min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1;
2377 dev->tagset.cmd_size = nvme_cmd_size(dev);
2378 dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE;
2379 dev->tagset.driver_data = dev;
2381 if (blk_mq_alloc_tag_set(&dev->tagset))
2384 schedule_work(&dev->scan_work);
2388 static int nvme_dev_map(struct nvme_dev *dev)
2391 int bars, result = -ENOMEM;
2392 struct pci_dev *pdev = to_pci_dev(dev->dev);
2394 if (pci_enable_device_mem(pdev))
2397 dev->entry[0].vector = pdev->irq;
2398 pci_set_master(pdev);
2399 bars = pci_select_bars(pdev, IORESOURCE_MEM);
2403 if (pci_request_selected_regions(pdev, bars, "nvme"))
2406 if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) &&
2407 dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32)))
2410 dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);
2414 if (readl(&dev->bar->csts) == -1) {
2420 * Some devices don't advertse INTx interrupts, pre-enable a single
2421 * MSIX vec for setup. We'll adjust this later.
2424 result = pci_enable_msix(pdev, dev->entry, 1);
2429 cap = readq(&dev->bar->cap);
2430 dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH);
2431 dev->db_stride = 1 << NVME_CAP_STRIDE(cap);
2432 dev->dbs = ((void __iomem *)dev->bar) + 4096;
2440 pci_release_regions(pdev);
2442 pci_disable_device(pdev);
2446 static void nvme_dev_unmap(struct nvme_dev *dev)
2448 struct pci_dev *pdev = to_pci_dev(dev->dev);
2450 if (pdev->msi_enabled)
2451 pci_disable_msi(pdev);
2452 else if (pdev->msix_enabled)
2453 pci_disable_msix(pdev);
2458 pci_release_regions(pdev);
2461 if (pci_is_enabled(pdev))
2462 pci_disable_device(pdev);
2465 struct nvme_delq_ctx {
2466 struct task_struct *waiter;
2467 struct kthread_worker *worker;
2471 static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev)
2473 dq->waiter = current;
2477 set_current_state(TASK_KILLABLE);
2478 if (!atomic_read(&dq->refcount))
2480 if (!schedule_timeout(ADMIN_TIMEOUT) ||
2481 fatal_signal_pending(current)) {
2483 * Disable the controller first since we can't trust it
2484 * at this point, but leave the admin queue enabled
2485 * until all queue deletion requests are flushed.
2486 * FIXME: This may take a while if there are more h/w
2487 * queues than admin tags.
2489 set_current_state(TASK_RUNNING);
2490 nvme_disable_ctrl(dev, readq(&dev->bar->cap));
2491 nvme_clear_queue(dev->queues[0]);
2492 flush_kthread_worker(dq->worker);
2493 nvme_disable_queue(dev, 0);
2497 set_current_state(TASK_RUNNING);
2500 static void nvme_put_dq(struct nvme_delq_ctx *dq)
2502 atomic_dec(&dq->refcount);
2504 wake_up_process(dq->waiter);
2507 static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq)
2509 atomic_inc(&dq->refcount);
2513 static void nvme_del_queue_end(struct nvme_queue *nvmeq)
2515 struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx;
2519 static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode,
2520 kthread_work_func_t fn)
2522 struct nvme_command c;
2524 memset(&c, 0, sizeof(c));
2525 c.delete_queue.opcode = opcode;
2526 c.delete_queue.qid = cpu_to_le16(nvmeq->qid);
2528 init_kthread_work(&nvmeq->cmdinfo.work, fn);
2529 return nvme_submit_admin_async_cmd(nvmeq->dev, &c, &nvmeq->cmdinfo,
2533 static void nvme_del_cq_work_handler(struct kthread_work *work)
2535 struct nvme_queue *nvmeq = container_of(work, struct nvme_queue,
2537 nvme_del_queue_end(nvmeq);
2540 static int nvme_delete_cq(struct nvme_queue *nvmeq)
2542 return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq,
2543 nvme_del_cq_work_handler);
2546 static void nvme_del_sq_work_handler(struct kthread_work *work)
2548 struct nvme_queue *nvmeq = container_of(work, struct nvme_queue,
2550 int status = nvmeq->cmdinfo.status;
2553 status = nvme_delete_cq(nvmeq);
2555 nvme_del_queue_end(nvmeq);
2558 static int nvme_delete_sq(struct nvme_queue *nvmeq)
2560 return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq,
2561 nvme_del_sq_work_handler);
2564 static void nvme_del_queue_start(struct kthread_work *work)
2566 struct nvme_queue *nvmeq = container_of(work, struct nvme_queue,
2568 if (nvme_delete_sq(nvmeq))
2569 nvme_del_queue_end(nvmeq);
2572 static void nvme_disable_io_queues(struct nvme_dev *dev)
2575 DEFINE_KTHREAD_WORKER_ONSTACK(worker);
2576 struct nvme_delq_ctx dq;
2577 struct task_struct *kworker_task = kthread_run(kthread_worker_fn,
2578 &worker, "nvme%d", dev->instance);
2580 if (IS_ERR(kworker_task)) {
2582 "Failed to create queue del task\n");
2583 for (i = dev->queue_count - 1; i > 0; i--)
2584 nvme_disable_queue(dev, i);
2589 atomic_set(&dq.refcount, 0);
2590 dq.worker = &worker;
2591 for (i = dev->queue_count - 1; i > 0; i--) {
2592 struct nvme_queue *nvmeq = dev->queues[i];
2594 if (nvme_suspend_queue(nvmeq))
2596 nvmeq->cmdinfo.ctx = nvme_get_dq(&dq);
2597 nvmeq->cmdinfo.worker = dq.worker;
2598 init_kthread_work(&nvmeq->cmdinfo.work, nvme_del_queue_start);
2599 queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work);
2601 nvme_wait_dq(&dq, dev);
2602 kthread_stop(kworker_task);
2606 * Remove the node from the device list and check
2607 * for whether or not we need to stop the nvme_thread.
2609 static void nvme_dev_list_remove(struct nvme_dev *dev)
2611 struct task_struct *tmp = NULL;
2613 spin_lock(&dev_list_lock);
2614 list_del_init(&dev->node);
2615 if (list_empty(&dev_list) && !IS_ERR_OR_NULL(nvme_thread)) {
2619 spin_unlock(&dev_list_lock);
2625 static void nvme_freeze_queues(struct nvme_dev *dev)
2629 list_for_each_entry(ns, &dev->namespaces, list) {
2630 blk_mq_freeze_queue_start(ns->queue);
2632 spin_lock_irq(ns->queue->queue_lock);
2633 queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
2634 spin_unlock_irq(ns->queue->queue_lock);
2636 blk_mq_cancel_requeue_work(ns->queue);
2637 blk_mq_stop_hw_queues(ns->queue);
2641 static void nvme_unfreeze_queues(struct nvme_dev *dev)
2645 list_for_each_entry(ns, &dev->namespaces, list) {
2646 queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue);
2647 blk_mq_unfreeze_queue(ns->queue);
2648 blk_mq_start_stopped_hw_queues(ns->queue, true);
2649 blk_mq_kick_requeue_list(ns->queue);
2653 static void nvme_dev_shutdown(struct nvme_dev *dev)
2658 nvme_dev_list_remove(dev);
2661 nvme_freeze_queues(dev);
2662 csts = readl(&dev->bar->csts);
2664 if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) {
2665 for (i = dev->queue_count - 1; i >= 0; i--) {
2666 struct nvme_queue *nvmeq = dev->queues[i];
2667 nvme_suspend_queue(nvmeq);
2670 nvme_disable_io_queues(dev);
2671 nvme_shutdown_ctrl(dev);
2672 nvme_disable_queue(dev, 0);
2674 nvme_dev_unmap(dev);
2676 for (i = dev->queue_count - 1; i >= 0; i--)
2677 nvme_clear_queue(dev->queues[i]);
2680 static void nvme_dev_remove(struct nvme_dev *dev)
2684 list_for_each_entry(ns, &dev->namespaces, list)
2688 static int nvme_setup_prp_pools(struct nvme_dev *dev)
2690 dev->prp_page_pool = dma_pool_create("prp list page", dev->dev,
2691 PAGE_SIZE, PAGE_SIZE, 0);
2692 if (!dev->prp_page_pool)
2695 /* Optimisation for I/Os between 4k and 128k */
2696 dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev,
2698 if (!dev->prp_small_pool) {
2699 dma_pool_destroy(dev->prp_page_pool);
2705 static void nvme_release_prp_pools(struct nvme_dev *dev)
2707 dma_pool_destroy(dev->prp_page_pool);
2708 dma_pool_destroy(dev->prp_small_pool);
2711 static DEFINE_IDA(nvme_instance_ida);
2713 static int nvme_set_instance(struct nvme_dev *dev)
2715 int instance, error;
2718 if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
2721 spin_lock(&dev_list_lock);
2722 error = ida_get_new(&nvme_instance_ida, &instance);
2723 spin_unlock(&dev_list_lock);
2724 } while (error == -EAGAIN);
2729 dev->instance = instance;
2733 static void nvme_release_instance(struct nvme_dev *dev)
2735 spin_lock(&dev_list_lock);
2736 ida_remove(&nvme_instance_ida, dev->instance);
2737 spin_unlock(&dev_list_lock);
2740 static void nvme_free_namespaces(struct nvme_dev *dev)
2742 struct nvme_ns *ns, *next;
2744 list_for_each_entry_safe(ns, next, &dev->namespaces, list)
2745 nvme_free_namespace(ns);
2748 static void nvme_free_dev(struct kref *kref)
2750 struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref);
2752 put_device(dev->dev);
2753 put_device(dev->device);
2754 nvme_free_namespaces(dev);
2755 nvme_release_instance(dev);
2756 if (dev->tagset.tags)
2757 blk_mq_free_tag_set(&dev->tagset);
2759 blk_put_queue(dev->admin_q);
2765 static int nvme_dev_open(struct inode *inode, struct file *f)
2767 struct nvme_dev *dev;
2768 int instance = iminor(inode);
2771 spin_lock(&dev_list_lock);
2772 list_for_each_entry(dev, &dev_list, node) {
2773 if (dev->instance == instance) {
2774 if (!dev->admin_q) {
2778 if (!kref_get_unless_zero(&dev->kref))
2780 f->private_data = dev;
2785 spin_unlock(&dev_list_lock);
2790 static int nvme_dev_release(struct inode *inode, struct file *f)
2792 struct nvme_dev *dev = f->private_data;
2793 kref_put(&dev->kref, nvme_free_dev);
2797 static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
2799 struct nvme_dev *dev = f->private_data;
2803 case NVME_IOCTL_ADMIN_CMD:
2804 return nvme_user_cmd(dev, NULL, (void __user *)arg);
2805 case NVME_IOCTL_IO_CMD:
2806 if (list_empty(&dev->namespaces))
2808 ns = list_first_entry(&dev->namespaces, struct nvme_ns, list);
2809 return nvme_user_cmd(dev, ns, (void __user *)arg);
2810 case NVME_IOCTL_RESET:
2811 dev_warn(dev->dev, "resetting controller\n");
2812 return nvme_reset(dev);
2818 static const struct file_operations nvme_dev_fops = {
2819 .owner = THIS_MODULE,
2820 .open = nvme_dev_open,
2821 .release = nvme_dev_release,
2822 .unlocked_ioctl = nvme_dev_ioctl,
2823 .compat_ioctl = nvme_dev_ioctl,
2826 static void nvme_set_irq_hints(struct nvme_dev *dev)
2828 struct nvme_queue *nvmeq;
2831 for (i = 0; i < dev->online_queues; i++) {
2832 nvmeq = dev->queues[i];
2834 if (!nvmeq->tags || !(*nvmeq->tags))
2837 irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector,
2838 blk_mq_tags_cpumask(*nvmeq->tags));
2842 static int nvme_dev_start(struct nvme_dev *dev)
2845 bool start_thread = false;
2847 result = nvme_dev_map(dev);
2851 result = nvme_configure_admin_queue(dev);
2855 spin_lock(&dev_list_lock);
2856 if (list_empty(&dev_list) && IS_ERR_OR_NULL(nvme_thread)) {
2857 start_thread = true;
2860 list_add(&dev->node, &dev_list);
2861 spin_unlock(&dev_list_lock);
2864 nvme_thread = kthread_run(nvme_kthread, NULL, "nvme");
2865 wake_up_all(&nvme_kthread_wait);
2867 wait_event_killable(nvme_kthread_wait, nvme_thread);
2869 if (IS_ERR_OR_NULL(nvme_thread)) {
2870 result = nvme_thread ? PTR_ERR(nvme_thread) : -EINTR;
2874 nvme_init_queue(dev->queues[0], 0);
2875 result = nvme_alloc_admin_tags(dev);
2879 result = nvme_setup_io_queues(dev);
2883 nvme_set_irq_hints(dev);
2885 dev->event_limit = 1;
2889 nvme_dev_remove_admin(dev);
2890 blk_put_queue(dev->admin_q);
2891 dev->admin_q = NULL;
2892 dev->queues[0]->tags = NULL;
2894 nvme_disable_queue(dev, 0);
2895 nvme_dev_list_remove(dev);
2897 nvme_dev_unmap(dev);
2901 static int nvme_remove_dead_ctrl(void *arg)
2903 struct nvme_dev *dev = (struct nvme_dev *)arg;
2904 struct pci_dev *pdev = to_pci_dev(dev->dev);
2906 if (pci_get_drvdata(pdev))
2907 pci_stop_and_remove_bus_device_locked(pdev);
2908 kref_put(&dev->kref, nvme_free_dev);
2912 static void nvme_remove_disks(struct work_struct *ws)
2914 struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work);
2916 nvme_free_queues(dev, 1);
2917 nvme_dev_remove(dev);
2920 static int nvme_dev_resume(struct nvme_dev *dev)
2924 ret = nvme_dev_start(dev);
2927 if (dev->online_queues < 2) {
2928 spin_lock(&dev_list_lock);
2929 dev->reset_workfn = nvme_remove_disks;
2930 queue_work(nvme_workq, &dev->reset_work);
2931 spin_unlock(&dev_list_lock);
2933 nvme_unfreeze_queues(dev);
2935 nvme_set_irq_hints(dev);
2940 static void nvme_dead_ctrl(struct nvme_dev *dev)
2942 dev_warn(dev->dev, "Device failed to resume\n");
2943 kref_get(&dev->kref);
2944 if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d",
2947 "Failed to start controller remove task\n");
2948 kref_put(&dev->kref, nvme_free_dev);
2952 static void nvme_dev_reset(struct nvme_dev *dev)
2954 bool in_probe = work_busy(&dev->probe_work);
2956 nvme_dev_shutdown(dev);
2958 /* Synchronize with device probe so that work will see failure status
2959 * and exit gracefully without trying to schedule another reset */
2960 flush_work(&dev->probe_work);
2962 /* Fail this device if reset occured during probe to avoid
2963 * infinite initialization loops. */
2965 nvme_dead_ctrl(dev);
2968 /* Schedule device resume asynchronously so the reset work is available
2969 * to cleanup errors that may occur during reinitialization */
2970 schedule_work(&dev->probe_work);
2973 static void nvme_reset_failed_dev(struct work_struct *ws)
2975 struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work);
2976 nvme_dev_reset(dev);
2979 static void nvme_reset_workfn(struct work_struct *work)
2981 struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work);
2982 dev->reset_workfn(work);
2985 static int nvme_reset(struct nvme_dev *dev)
2989 if (!dev->admin_q || blk_queue_dying(dev->admin_q))
2992 spin_lock(&dev_list_lock);
2993 if (!work_pending(&dev->reset_work)) {
2994 dev->reset_workfn = nvme_reset_failed_dev;
2995 queue_work(nvme_workq, &dev->reset_work);
2998 spin_unlock(&dev_list_lock);
3001 flush_work(&dev->reset_work);
3002 flush_work(&dev->probe_work);
3009 static ssize_t nvme_sysfs_reset(struct device *dev,
3010 struct device_attribute *attr, const char *buf,
3013 struct nvme_dev *ndev = dev_get_drvdata(dev);
3016 ret = nvme_reset(ndev);
3022 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
3024 static void nvme_async_probe(struct work_struct *work);
3025 static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3027 int node, result = -ENOMEM;
3028 struct nvme_dev *dev;
3030 node = dev_to_node(&pdev->dev);
3031 if (node == NUMA_NO_NODE)
3032 set_dev_node(&pdev->dev, 0);
3034 dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node);
3037 dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry),
3041 dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *),
3046 INIT_LIST_HEAD(&dev->namespaces);
3047 dev->reset_workfn = nvme_reset_failed_dev;
3048 INIT_WORK(&dev->reset_work, nvme_reset_workfn);
3049 dev->dev = get_device(&pdev->dev);
3050 pci_set_drvdata(pdev, dev);
3051 result = nvme_set_instance(dev);
3055 result = nvme_setup_prp_pools(dev);
3059 kref_init(&dev->kref);
3060 dev->device = device_create(nvme_class, &pdev->dev,
3061 MKDEV(nvme_char_major, dev->instance),
3062 dev, "nvme%d", dev->instance);
3063 if (IS_ERR(dev->device)) {
3064 result = PTR_ERR(dev->device);
3067 get_device(dev->device);
3068 dev_set_drvdata(dev->device, dev);
3070 result = device_create_file(dev->device, &dev_attr_reset_controller);
3074 INIT_LIST_HEAD(&dev->node);
3075 INIT_WORK(&dev->scan_work, nvme_dev_scan);
3076 INIT_WORK(&dev->probe_work, nvme_async_probe);
3077 schedule_work(&dev->probe_work);
3081 device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance));
3082 put_device(dev->device);
3084 nvme_release_prp_pools(dev);
3086 nvme_release_instance(dev);
3088 put_device(dev->dev);
3096 static void nvme_async_probe(struct work_struct *work)
3098 struct nvme_dev *dev = container_of(work, struct nvme_dev, probe_work);
3100 if (nvme_dev_resume(dev) && !work_busy(&dev->reset_work))
3101 nvme_dead_ctrl(dev);
3104 static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)
3106 struct nvme_dev *dev = pci_get_drvdata(pdev);
3109 nvme_dev_shutdown(dev);
3111 nvme_dev_resume(dev);
3114 static void nvme_shutdown(struct pci_dev *pdev)
3116 struct nvme_dev *dev = pci_get_drvdata(pdev);
3117 nvme_dev_shutdown(dev);
3120 static void nvme_remove(struct pci_dev *pdev)
3122 struct nvme_dev *dev = pci_get_drvdata(pdev);
3124 spin_lock(&dev_list_lock);
3125 list_del_init(&dev->node);
3126 spin_unlock(&dev_list_lock);
3128 pci_set_drvdata(pdev, NULL);
3129 flush_work(&dev->probe_work);
3130 flush_work(&dev->reset_work);
3131 flush_work(&dev->scan_work);
3132 device_remove_file(dev->device, &dev_attr_reset_controller);
3133 nvme_dev_remove(dev);
3134 nvme_dev_shutdown(dev);
3135 nvme_dev_remove_admin(dev);
3136 device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance));
3137 nvme_free_queues(dev, 0);
3138 nvme_release_prp_pools(dev);
3139 kref_put(&dev->kref, nvme_free_dev);
3142 /* These functions are yet to be implemented */
3143 #define nvme_error_detected NULL
3144 #define nvme_dump_registers NULL
3145 #define nvme_link_reset NULL
3146 #define nvme_slot_reset NULL
3147 #define nvme_error_resume NULL
3149 #ifdef CONFIG_PM_SLEEP
3150 static int nvme_suspend(struct device *dev)
3152 struct pci_dev *pdev = to_pci_dev(dev);
3153 struct nvme_dev *ndev = pci_get_drvdata(pdev);
3155 nvme_dev_shutdown(ndev);
3159 static int nvme_resume(struct device *dev)
3161 struct pci_dev *pdev = to_pci_dev(dev);
3162 struct nvme_dev *ndev = pci_get_drvdata(pdev);
3164 if (nvme_dev_resume(ndev) && !work_busy(&ndev->reset_work)) {
3165 ndev->reset_workfn = nvme_reset_failed_dev;
3166 queue_work(nvme_workq, &ndev->reset_work);
3172 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
3174 static const struct pci_error_handlers nvme_err_handler = {
3175 .error_detected = nvme_error_detected,
3176 .mmio_enabled = nvme_dump_registers,
3177 .link_reset = nvme_link_reset,
3178 .slot_reset = nvme_slot_reset,
3179 .resume = nvme_error_resume,
3180 .reset_notify = nvme_reset_notify,
3183 /* Move to pci_ids.h later */
3184 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
3186 static const struct pci_device_id nvme_id_table[] = {
3187 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
3190 MODULE_DEVICE_TABLE(pci, nvme_id_table);
3192 static struct pci_driver nvme_driver = {
3194 .id_table = nvme_id_table,
3195 .probe = nvme_probe,
3196 .remove = nvme_remove,
3197 .shutdown = nvme_shutdown,
3199 .pm = &nvme_dev_pm_ops,
3201 .err_handler = &nvme_err_handler,
3204 static int __init nvme_init(void)
3208 init_waitqueue_head(&nvme_kthread_wait);
3210 nvme_workq = create_singlethread_workqueue("nvme");
3214 result = register_blkdev(nvme_major, "nvme");
3217 else if (result > 0)
3218 nvme_major = result;
3220 result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
3223 goto unregister_blkdev;
3224 else if (result > 0)
3225 nvme_char_major = result;
3227 nvme_class = class_create(THIS_MODULE, "nvme");
3228 if (IS_ERR(nvme_class)) {
3229 result = PTR_ERR(nvme_class);
3230 goto unregister_chrdev;
3233 result = pci_register_driver(&nvme_driver);
3239 class_destroy(nvme_class);
3241 __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
3243 unregister_blkdev(nvme_major, "nvme");
3245 destroy_workqueue(nvme_workq);
3249 static void __exit nvme_exit(void)
3251 pci_unregister_driver(&nvme_driver);
3252 unregister_blkdev(nvme_major, "nvme");
3253 destroy_workqueue(nvme_workq);
3254 class_destroy(nvme_class);
3255 __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
3256 BUG_ON(nvme_thread && !IS_ERR(nvme_thread));
3260 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
3261 MODULE_LICENSE("GPL");
3262 MODULE_VERSION("1.0");
3263 module_init(nvme_init);
3264 module_exit(nvme_exit);