2 * NVM Express device driver
3 * Copyright (c) 2011, 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
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 #include <linux/nvme.h>
20 #include <linux/bio.h>
21 #include <linux/blkdev.h>
22 #include <linux/errno.h>
24 #include <linux/genhd.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
28 #include <linux/kdev_t.h>
29 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/pci.h>
34 #include <linux/sched.h>
35 #include <linux/slab.h>
36 #include <linux/types.h>
37 #include <linux/version.h>
39 #define NVME_Q_DEPTH 1024
40 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
41 #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
42 #define NVME_MINORS 64
44 static int nvme_major;
45 module_param(nvme_major, int, 0);
48 * Represents an NVM Express device. Each nvme_dev is a PCI function.
51 struct nvme_queue **queues;
53 struct pci_dev *pci_dev;
57 struct msix_entry *entry;
58 struct nvme_bar __iomem *bar;
59 struct list_head namespaces;
66 * An NVM Express namespace is equivalent to a SCSI LUN
69 struct list_head list;
72 struct request_queue *queue;
80 * An NVM Express queue. Each device has at least two (one for admin
81 * commands and one for I/O commands).
84 struct device *q_dmadev;
86 struct nvme_command *sq_cmds;
87 volatile struct nvme_completion *cqes;
88 dma_addr_t sq_dma_addr;
89 dma_addr_t cq_dma_addr;
90 wait_queue_head_t sq_full;
91 struct bio_list sq_cong;
99 unsigned long cmdid_data[];
103 * Check we didin't inadvertently grow the command struct
105 static inline void _nvme_check_size(void)
107 BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
108 BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64);
109 BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64);
110 BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64);
111 BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
112 BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
113 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096);
114 BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096);
115 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
119 * alloc_cmdid - Allocate a Command ID
120 * @param nvmeq The queue that will be used for this command
121 * @param ctx A pointer that will be passed to the handler
122 * @param handler The ID of the handler to call
124 * Allocate a Command ID for a queue. The data passed in will
125 * be passed to the completion handler. This is implemented by using
126 * the bottom two bits of the ctx pointer to store the handler ID.
127 * Passing in a pointer that's not 4-byte aligned will cause a BUG.
128 * We can change this if it becomes a problem.
130 static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx, int handler)
132 int depth = nvmeq->q_depth;
133 unsigned long data = (unsigned long)ctx | handler;
136 BUG_ON((unsigned long)ctx & 3);
139 cmdid = find_first_zero_bit(nvmeq->cmdid_data, depth);
142 } while (test_and_set_bit(cmdid, nvmeq->cmdid_data));
144 nvmeq->cmdid_data[cmdid + BITS_TO_LONGS(depth)] = data;
148 static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx,
152 wait_event_killable(nvmeq->sq_full,
153 (cmdid = alloc_cmdid(nvmeq, ctx, handler)) >= 0);
154 return (cmdid < 0) ? -EINTR : cmdid;
157 /* If you need more than four handlers, you'll need to change how
158 * alloc_cmdid and nvme_process_cq work
161 sync_completion_id = 0,
165 static unsigned long free_cmdid(struct nvme_queue *nvmeq, int cmdid)
169 data = nvmeq->cmdid_data[cmdid + BITS_TO_LONGS(nvmeq->q_depth)];
170 clear_bit(cmdid, nvmeq->cmdid_data);
171 wake_up(&nvmeq->sq_full);
175 static struct nvme_queue *get_nvmeq(struct nvme_ns *ns)
177 int qid, cpu = get_cpu();
178 if (cpu < ns->dev->queue_count)
181 qid = (cpu % rounddown_pow_of_two(ns->dev->queue_count)) + 1;
182 return ns->dev->queues[qid];
185 static void put_nvmeq(struct nvme_queue *nvmeq)
191 * nvme_submit_cmd: Copy a command into a queue and ring the doorbell
192 * @nvmeq: The queue to use
193 * @cmd: The command to send
195 * Safe to use from interrupt context
197 static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
201 /* XXX: Need to check tail isn't going to overrun head */
202 spin_lock_irqsave(&nvmeq->q_lock, flags);
203 tail = nvmeq->sq_tail;
204 memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
205 writel(tail, nvmeq->q_db);
206 if (++tail == nvmeq->q_depth)
208 nvmeq->sq_tail = tail;
209 spin_unlock_irqrestore(&nvmeq->q_lock, flags);
214 struct nvme_req_info {
217 struct scatterlist sg[0];
220 /* XXX: use a mempool */
221 static struct nvme_req_info *alloc_info(unsigned nseg, gfp_t gfp)
223 return kmalloc(sizeof(struct nvme_req_info) +
224 sizeof(struct scatterlist) * nseg, gfp);
227 static void free_info(struct nvme_req_info *info)
232 static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
233 struct nvme_completion *cqe)
235 struct nvme_req_info *info = ctx;
236 struct bio *bio = info->bio;
237 u16 status = le16_to_cpup(&cqe->status) >> 1;
239 dma_unmap_sg(nvmeq->q_dmadev, info->sg, info->nents,
240 bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
242 bio_endio(bio, status ? -EIO : 0);
245 /* length is in bytes */
246 static void nvme_setup_prps(struct nvme_common_command *cmd,
247 struct scatterlist *sg, int length)
249 int dma_len = sg_dma_len(sg);
250 u64 dma_addr = sg_dma_address(sg);
251 int offset = offset_in_page(dma_addr);
253 cmd->prp1 = cpu_to_le64(dma_addr);
254 length -= (PAGE_SIZE - offset);
258 dma_len -= (PAGE_SIZE - offset);
260 dma_addr += (PAGE_SIZE - offset);
263 dma_addr = sg_dma_address(sg);
264 dma_len = sg_dma_len(sg);
267 if (length <= PAGE_SIZE) {
268 cmd->prp2 = cpu_to_le64(dma_addr);
272 /* XXX: support PRP lists */
275 static int nvme_map_bio(struct device *dev, struct nvme_req_info *info,
276 struct bio *bio, enum dma_data_direction dma_dir, int psegs)
278 struct bio_vec *bvec;
279 struct scatterlist *sg = info->sg;
282 sg_init_table(sg, psegs);
283 bio_for_each_segment(bvec, bio, i) {
284 sg_set_page(sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset);
285 /* XXX: handle non-mergable here */
290 return dma_map_sg(dev, info->sg, info->nents, dma_dir);
293 static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
296 struct nvme_command *cmnd;
297 struct nvme_req_info *info;
298 enum dma_data_direction dma_dir;
303 int psegs = bio_phys_segments(ns->queue, bio);
305 info = alloc_info(psegs, GFP_NOIO);
310 cmdid = alloc_cmdid(nvmeq, info, bio_completion_id);
311 if (unlikely(cmdid < 0))
315 if (bio->bi_rw & REQ_FUA)
316 control |= NVME_RW_FUA;
317 if (bio->bi_rw & (REQ_FAILFAST_DEV | REQ_RAHEAD))
318 control |= NVME_RW_LR;
321 if (bio->bi_rw & REQ_RAHEAD)
322 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
324 spin_lock_irqsave(&nvmeq->q_lock, flags);
325 cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
327 memset(cmnd, 0, sizeof(*cmnd));
328 if (bio_data_dir(bio)) {
329 cmnd->rw.opcode = nvme_cmd_write;
330 dma_dir = DMA_TO_DEVICE;
332 cmnd->rw.opcode = nvme_cmd_read;
333 dma_dir = DMA_FROM_DEVICE;
336 nvme_map_bio(nvmeq->q_dmadev, info, bio, dma_dir, psegs);
339 cmnd->rw.command_id = cmdid;
340 cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
341 nvme_setup_prps(&cmnd->common, info->sg, bio->bi_size);
342 cmnd->rw.slba = cpu_to_le64(bio->bi_sector >> (ns->lba_shift - 9));
343 cmnd->rw.length = cpu_to_le16((bio->bi_size >> ns->lba_shift) - 1);
344 cmnd->rw.control = cpu_to_le16(control);
345 cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
347 writel(nvmeq->sq_tail, nvmeq->q_db);
348 if (++nvmeq->sq_tail == nvmeq->q_depth)
351 spin_unlock_irqrestore(&nvmeq->q_lock, flags);
362 * NB: return value of non-zero would mean that we were a stacking driver.
363 * make_request must always succeed.
365 static int nvme_make_request(struct request_queue *q, struct bio *bio)
367 struct nvme_ns *ns = q->queuedata;
368 struct nvme_queue *nvmeq = get_nvmeq(ns);
370 if (nvme_submit_bio_queue(nvmeq, ns, bio)) {
371 blk_set_queue_congested(q, rw_is_sync(bio->bi_rw));
372 bio_list_add(&nvmeq->sq_cong, bio);
379 struct sync_cmd_info {
380 struct task_struct *task;
385 static void sync_completion(struct nvme_queue *nvmeq, void *ctx,
386 struct nvme_completion *cqe)
388 struct sync_cmd_info *cmdinfo = ctx;
389 cmdinfo->result = le32_to_cpup(&cqe->result);
390 cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
391 wake_up_process(cmdinfo->task);
394 typedef void (*completion_fn)(struct nvme_queue *, void *,
395 struct nvme_completion *);
397 static irqreturn_t nvme_process_cq(struct nvme_queue *nvmeq)
401 static const completion_fn completions[4] = {
402 [sync_completion_id] = sync_completion,
403 [bio_completion_id] = bio_completion,
406 head = nvmeq->cq_head;
407 phase = nvmeq->cq_phase;
412 unsigned char handler;
413 struct nvme_completion cqe = nvmeq->cqes[head];
414 if ((le16_to_cpu(cqe.status) & 1) != phase)
416 nvmeq->sq_head = le16_to_cpu(cqe.sq_head);
417 if (++head == nvmeq->q_depth) {
422 data = free_cmdid(nvmeq, cqe.command_id);
424 ptr = (void *)(data & ~3UL);
425 completions[handler](nvmeq, ptr, &cqe);
428 /* If the controller ignores the cq head doorbell and continuously
429 * writes to the queue, it is theoretically possible to wrap around
430 * the queue twice and mistakenly return IRQ_NONE. Linux only
431 * requires that 0.1% of your interrupts are handled, so this isn't
434 if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
437 writel(head, nvmeq->q_db + 1);
438 nvmeq->cq_head = head;
439 nvmeq->cq_phase = phase;
444 static irqreturn_t nvme_irq(int irq, void *data)
446 return nvme_process_cq(data);
450 * Returns 0 on success. If the result is negative, it's a Linux error code;
451 * if the result is positive, it's an NVM Express status code
453 static int nvme_submit_sync_cmd(struct nvme_queue *q, struct nvme_command *cmd,
457 struct sync_cmd_info cmdinfo;
459 cmdinfo.task = current;
460 cmdinfo.status = -EINTR;
462 cmdid = alloc_cmdid_killable(q, &cmdinfo, sync_completion_id);
465 cmd->common.command_id = cmdid;
467 set_current_state(TASK_UNINTERRUPTIBLE);
468 nvme_submit_cmd(q, cmd);
472 *result = cmdinfo.result;
474 return cmdinfo.status;
477 static int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
480 return nvme_submit_sync_cmd(dev->queues[0], cmd, result);
483 static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
486 struct nvme_command c;
488 memset(&c, 0, sizeof(c));
489 c.delete_queue.opcode = opcode;
490 c.delete_queue.qid = cpu_to_le16(id);
492 status = nvme_submit_admin_cmd(dev, &c, NULL);
498 static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
499 struct nvme_queue *nvmeq)
502 struct nvme_command c;
503 int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED;
505 memset(&c, 0, sizeof(c));
506 c.create_cq.opcode = nvme_admin_create_cq;
507 c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr);
508 c.create_cq.cqid = cpu_to_le16(qid);
509 c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
510 c.create_cq.cq_flags = cpu_to_le16(flags);
511 c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector);
513 status = nvme_submit_admin_cmd(dev, &c, NULL);
519 static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
520 struct nvme_queue *nvmeq)
523 struct nvme_command c;
524 int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM;
526 memset(&c, 0, sizeof(c));
527 c.create_sq.opcode = nvme_admin_create_sq;
528 c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr);
529 c.create_sq.sqid = cpu_to_le16(qid);
530 c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
531 c.create_sq.sq_flags = cpu_to_le16(flags);
532 c.create_sq.cqid = cpu_to_le16(qid);
534 status = nvme_submit_admin_cmd(dev, &c, NULL);
540 static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid)
542 return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid);
545 static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid)
547 return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid);
550 static void nvme_free_queue(struct nvme_dev *dev, int qid)
552 struct nvme_queue *nvmeq = dev->queues[qid];
554 free_irq(dev->entry[nvmeq->cq_vector].vector, nvmeq);
556 /* Don't tell the adapter to delete the admin queue */
558 adapter_delete_sq(dev, qid);
559 adapter_delete_cq(dev, qid);
562 dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
563 (void *)nvmeq->cqes, nvmeq->cq_dma_addr);
564 dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
565 nvmeq->sq_cmds, nvmeq->sq_dma_addr);
569 static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
570 int depth, int vector)
572 struct device *dmadev = &dev->pci_dev->dev;
573 unsigned extra = (depth + BITS_TO_LONGS(depth)) * sizeof(long);
574 struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL);
578 nvmeq->cqes = dma_alloc_coherent(dmadev, CQ_SIZE(depth),
579 &nvmeq->cq_dma_addr, GFP_KERNEL);
582 memset((void *)nvmeq->cqes, 0, CQ_SIZE(depth));
584 nvmeq->sq_cmds = dma_alloc_coherent(dmadev, SQ_SIZE(depth),
585 &nvmeq->sq_dma_addr, GFP_KERNEL);
589 nvmeq->q_dmadev = dmadev;
590 spin_lock_init(&nvmeq->q_lock);
593 init_waitqueue_head(&nvmeq->sq_full);
594 bio_list_init(&nvmeq->sq_cong);
595 nvmeq->q_db = &dev->dbs[qid * 2];
596 nvmeq->q_depth = depth;
597 nvmeq->cq_vector = vector;
602 dma_free_coherent(dmadev, CQ_SIZE(nvmeq->q_depth), (void *)nvmeq->cqes,
609 static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq,
612 return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq,
613 IRQF_DISABLED | IRQF_SHARED, name, nvmeq);
616 static __devinit struct nvme_queue *nvme_create_queue(struct nvme_dev *dev,
617 int qid, int cq_size, int vector)
620 struct nvme_queue *nvmeq = nvme_alloc_queue(dev, qid, cq_size, vector);
625 result = adapter_alloc_cq(dev, qid, nvmeq);
629 result = adapter_alloc_sq(dev, qid, nvmeq);
633 result = queue_request_irq(dev, nvmeq, "nvme");
640 adapter_delete_sq(dev, qid);
642 adapter_delete_cq(dev, qid);
644 dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
645 (void *)nvmeq->cqes, nvmeq->cq_dma_addr);
646 dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
647 nvmeq->sq_cmds, nvmeq->sq_dma_addr);
652 static int __devinit nvme_configure_admin_queue(struct nvme_dev *dev)
656 struct nvme_queue *nvmeq;
658 dev->dbs = ((void __iomem *)dev->bar) + 4096;
660 nvmeq = nvme_alloc_queue(dev, 0, 64, 0);
664 aqa = nvmeq->q_depth - 1;
667 dev->ctrl_config = NVME_CC_ENABLE | NVME_CC_CSS_NVM;
668 dev->ctrl_config |= (PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT;
669 dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
671 writel(0, &dev->bar->cc);
672 writel(aqa, &dev->bar->aqa);
673 writeq(nvmeq->sq_dma_addr, &dev->bar->asq);
674 writeq(nvmeq->cq_dma_addr, &dev->bar->acq);
675 writel(dev->ctrl_config, &dev->bar->cc);
677 while (!(readl(&dev->bar->csts) & NVME_CSTS_RDY)) {
679 if (fatal_signal_pending(current))
683 result = queue_request_irq(dev, nvmeq, "nvme admin");
684 dev->queues[0] = nvmeq;
688 static int nvme_map_user_pages(struct nvme_dev *dev, int write,
689 unsigned long addr, unsigned length,
690 struct scatterlist **sgp)
692 int i, err, count, nents, offset;
693 struct scatterlist *sg;
701 offset = offset_in_page(addr);
702 count = DIV_ROUND_UP(offset + length, PAGE_SIZE);
703 pages = kcalloc(count, sizeof(*pages), GFP_KERNEL);
705 err = get_user_pages_fast(addr, count, 1, pages);
712 sg = kcalloc(count, sizeof(*sg), GFP_KERNEL);
713 sg_init_table(sg, count);
714 sg_set_page(&sg[0], pages[0], PAGE_SIZE - offset, offset);
715 length -= (PAGE_SIZE - offset);
716 for (i = 1; i < count; i++) {
717 sg_set_page(&sg[i], pages[i], min_t(int, length, PAGE_SIZE), 0);
722 nents = dma_map_sg(&dev->pci_dev->dev, sg, count,
723 write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
732 for (i = 0; i < count; i++)
738 static void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
739 unsigned long addr, int length,
740 struct scatterlist *sg, int nents)
744 count = DIV_ROUND_UP(offset_in_page(addr) + length, PAGE_SIZE);
745 dma_unmap_sg(&dev->pci_dev->dev, sg, nents, DMA_FROM_DEVICE);
747 for (i = 0; i < count; i++)
748 put_page(sg_page(&sg[i]));
751 static int nvme_submit_user_admin_command(struct nvme_dev *dev,
752 unsigned long addr, unsigned length,
753 struct nvme_command *cmd)
756 struct scatterlist *sg;
758 nents = nvme_map_user_pages(dev, 0, addr, length, &sg);
761 nvme_setup_prps(&cmd->common, sg, length);
762 err = nvme_submit_admin_cmd(dev, cmd, NULL);
763 nvme_unmap_user_pages(dev, 0, addr, length, sg, nents);
764 return err ? -EIO : 0;
767 static int nvme_identify(struct nvme_ns *ns, unsigned long addr, int cns)
769 struct nvme_command c;
771 memset(&c, 0, sizeof(c));
772 c.identify.opcode = nvme_admin_identify;
773 c.identify.nsid = cns ? 0 : cpu_to_le32(ns->ns_id);
774 c.identify.cns = cpu_to_le32(cns);
776 return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c);
779 static int nvme_get_range_type(struct nvme_ns *ns, unsigned long addr)
781 struct nvme_command c;
783 memset(&c, 0, sizeof(c));
784 c.features.opcode = nvme_admin_get_features;
785 c.features.nsid = cpu_to_le32(ns->ns_id);
786 c.features.fid = cpu_to_le32(NVME_FEAT_LBA_RANGE);
788 return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c);
791 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
793 struct nvme_dev *dev = ns->dev;
794 struct nvme_queue *nvmeq;
795 struct nvme_user_io io;
796 struct nvme_command c;
800 struct scatterlist *sg;
802 if (copy_from_user(&io, uio, sizeof(io)))
804 length = io.nblocks << io.block_shift;
805 nents = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length, &sg);
809 memset(&c, 0, sizeof(c));
810 c.rw.opcode = io.opcode;
811 c.rw.flags = io.flags;
812 c.rw.nsid = cpu_to_le32(io.nsid);
813 c.rw.slba = cpu_to_le64(io.slba);
814 c.rw.length = cpu_to_le16(io.nblocks - 1);
815 c.rw.control = cpu_to_le16(io.control);
816 c.rw.dsmgmt = cpu_to_le16(io.dsmgmt);
817 c.rw.reftag = cpu_to_le32(io.reftag); /* XXX: endian? */
818 c.rw.apptag = cpu_to_le16(io.apptag);
819 c.rw.appmask = cpu_to_le16(io.appmask);
821 nvme_setup_prps(&c.common, sg, length);
823 nvmeq = get_nvmeq(ns);
824 status = nvme_submit_sync_cmd(nvmeq, &c, &result);
827 nvme_unmap_user_pages(dev, io.opcode & 1, io.addr, length, sg, nents);
828 put_user(result, &uio->result);
832 static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
835 struct nvme_ns *ns = bdev->bd_disk->private_data;
838 case NVME_IOCTL_IDENTIFY_NS:
839 return nvme_identify(ns, arg, 0);
840 case NVME_IOCTL_IDENTIFY_CTRL:
841 return nvme_identify(ns, arg, 1);
842 case NVME_IOCTL_GET_RANGE_TYPE:
843 return nvme_get_range_type(ns, arg);
844 case NVME_IOCTL_SUBMIT_IO:
845 return nvme_submit_io(ns, (void __user *)arg);
851 static const struct block_device_operations nvme_fops = {
852 .owner = THIS_MODULE,
856 static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, int index,
857 struct nvme_id_ns *id, struct nvme_lba_range_type *rt)
860 struct gendisk *disk;
863 if (rt->attributes & NVME_LBART_ATTRIB_HIDE)
866 ns = kzalloc(sizeof(*ns), GFP_KERNEL);
869 ns->queue = blk_alloc_queue(GFP_KERNEL);
872 ns->queue->queue_flags = QUEUE_FLAG_DEFAULT | QUEUE_FLAG_NOMERGES |
873 QUEUE_FLAG_NONROT | QUEUE_FLAG_DISCARD;
874 blk_queue_make_request(ns->queue, nvme_make_request);
876 ns->queue->queuedata = ns;
878 disk = alloc_disk(NVME_MINORS);
883 lbaf = id->flbas & 0xf;
884 ns->lba_shift = id->lbaf[lbaf].ds;
886 disk->major = nvme_major;
887 disk->minors = NVME_MINORS;
888 disk->first_minor = NVME_MINORS * index;
889 disk->fops = &nvme_fops;
890 disk->private_data = ns;
891 disk->queue = ns->queue;
892 disk->driverfs_dev = &dev->pci_dev->dev;
893 sprintf(disk->disk_name, "nvme%dn%d", dev->instance, index);
894 set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
899 blk_cleanup_queue(ns->queue);
905 static void nvme_ns_free(struct nvme_ns *ns)
908 blk_cleanup_queue(ns->queue);
912 static int set_queue_count(struct nvme_dev *dev, int count)
916 struct nvme_command c;
917 u32 q_count = (count - 1) | ((count - 1) << 16);
919 memset(&c, 0, sizeof(c));
920 c.features.opcode = nvme_admin_get_features;
921 c.features.fid = cpu_to_le32(NVME_FEAT_NUM_QUEUES);
922 c.features.dword11 = cpu_to_le32(q_count);
924 status = nvme_submit_admin_cmd(dev, &c, &result);
927 return min(result & 0xffff, result >> 16) + 1;
930 static int __devinit nvme_setup_io_queues(struct nvme_dev *dev)
932 int result, cpu, i, nr_queues;
934 nr_queues = num_online_cpus();
935 result = set_queue_count(dev, nr_queues);
938 if (result < nr_queues)
941 /* Deregister the admin queue's interrupt */
942 free_irq(dev->entry[0].vector, dev->queues[0]);
944 for (i = 0; i < nr_queues; i++)
945 dev->entry[i].entry = i;
947 result = pci_enable_msix(dev->pci_dev, dev->entry, nr_queues);
950 } else if (result > 0) {
959 result = queue_request_irq(dev, dev->queues[0], "nvme admin");
960 /* XXX: handle failure here */
962 cpu = cpumask_first(cpu_online_mask);
963 for (i = 0; i < nr_queues; i++) {
964 irq_set_affinity_hint(dev->entry[i].vector, get_cpu_mask(cpu));
965 cpu = cpumask_next(cpu, cpu_online_mask);
968 for (i = 0; i < nr_queues; i++) {
969 dev->queues[i + 1] = nvme_create_queue(dev, i + 1,
971 if (!dev->queues[i + 1])
979 static void nvme_free_queues(struct nvme_dev *dev)
983 for (i = dev->queue_count - 1; i >= 0; i--)
984 nvme_free_queue(dev, i);
987 static int __devinit nvme_dev_add(struct nvme_dev *dev)
990 struct nvme_ns *ns, *next;
991 struct nvme_id_ctrl *ctrl;
994 struct nvme_command cid, crt;
996 res = nvme_setup_io_queues(dev);
1000 /* XXX: Switch to a SG list once prp2 works */
1001 id = dma_alloc_coherent(&dev->pci_dev->dev, 8192, &dma_addr,
1004 memset(&cid, 0, sizeof(cid));
1005 cid.identify.opcode = nvme_admin_identify;
1006 cid.identify.nsid = 0;
1007 cid.identify.prp1 = cpu_to_le64(dma_addr);
1008 cid.identify.cns = cpu_to_le32(1);
1010 res = nvme_submit_admin_cmd(dev, &cid, NULL);
1017 nn = le32_to_cpup(&ctrl->nn);
1018 memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
1019 memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
1020 memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
1022 cid.identify.cns = 0;
1023 memset(&crt, 0, sizeof(crt));
1024 crt.features.opcode = nvme_admin_get_features;
1025 crt.features.prp1 = cpu_to_le64(dma_addr + 4096);
1026 crt.features.fid = cpu_to_le32(NVME_FEAT_LBA_RANGE);
1028 for (i = 0; i < nn; i++) {
1029 cid.identify.nsid = cpu_to_le32(i);
1030 res = nvme_submit_admin_cmd(dev, &cid, NULL);
1034 if (((struct nvme_id_ns *)id)->ncap == 0)
1037 crt.features.nsid = cpu_to_le32(i);
1038 res = nvme_submit_admin_cmd(dev, &crt, NULL);
1042 ns = nvme_alloc_ns(dev, i, id, id + 4096);
1044 list_add_tail(&ns->list, &dev->namespaces);
1046 list_for_each_entry(ns, &dev->namespaces, list)
1049 dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr);
1053 list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
1054 list_del(&ns->list);
1058 dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr);
1062 static int nvme_dev_remove(struct nvme_dev *dev)
1064 struct nvme_ns *ns, *next;
1066 /* TODO: wait all I/O finished or cancel them */
1068 list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
1069 list_del(&ns->list);
1070 del_gendisk(ns->disk);
1074 nvme_free_queues(dev);
1079 /* XXX: Use an ida or something to let remove / add work correctly */
1080 static void nvme_set_instance(struct nvme_dev *dev)
1082 static int instance;
1083 dev->instance = instance++;
1086 static void nvme_release_instance(struct nvme_dev *dev)
1090 static int __devinit nvme_probe(struct pci_dev *pdev,
1091 const struct pci_device_id *id)
1093 int bars, result = -ENOMEM;
1094 struct nvme_dev *dev;
1096 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1099 dev->entry = kcalloc(num_possible_cpus(), sizeof(*dev->entry),
1103 dev->queues = kcalloc(num_possible_cpus() + 1, sizeof(void *),
1108 if (pci_enable_device_mem(pdev))
1110 pci_set_master(pdev);
1111 bars = pci_select_bars(pdev, IORESOURCE_MEM);
1112 if (pci_request_selected_regions(pdev, bars, "nvme"))
1115 INIT_LIST_HEAD(&dev->namespaces);
1116 dev->pci_dev = pdev;
1117 pci_set_drvdata(pdev, dev);
1118 dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
1119 dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
1120 nvme_set_instance(dev);
1121 dev->entry[0].vector = pdev->irq;
1123 dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);
1129 result = nvme_configure_admin_queue(dev);
1134 result = nvme_dev_add(dev);
1140 nvme_free_queues(dev);
1144 pci_disable_msix(pdev);
1145 nvme_release_instance(dev);
1147 pci_disable_device(pdev);
1148 pci_release_regions(pdev);
1156 static void __devexit nvme_remove(struct pci_dev *pdev)
1158 struct nvme_dev *dev = pci_get_drvdata(pdev);
1159 nvme_dev_remove(dev);
1160 pci_disable_msix(pdev);
1162 nvme_release_instance(dev);
1163 pci_disable_device(pdev);
1164 pci_release_regions(pdev);
1170 /* These functions are yet to be implemented */
1171 #define nvme_error_detected NULL
1172 #define nvme_dump_registers NULL
1173 #define nvme_link_reset NULL
1174 #define nvme_slot_reset NULL
1175 #define nvme_error_resume NULL
1176 #define nvme_suspend NULL
1177 #define nvme_resume NULL
1179 static struct pci_error_handlers nvme_err_handler = {
1180 .error_detected = nvme_error_detected,
1181 .mmio_enabled = nvme_dump_registers,
1182 .link_reset = nvme_link_reset,
1183 .slot_reset = nvme_slot_reset,
1184 .resume = nvme_error_resume,
1187 /* Move to pci_ids.h later */
1188 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
1190 static DEFINE_PCI_DEVICE_TABLE(nvme_id_table) = {
1191 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
1194 MODULE_DEVICE_TABLE(pci, nvme_id_table);
1196 static struct pci_driver nvme_driver = {
1198 .id_table = nvme_id_table,
1199 .probe = nvme_probe,
1200 .remove = __devexit_p(nvme_remove),
1201 .suspend = nvme_suspend,
1202 .resume = nvme_resume,
1203 .err_handler = &nvme_err_handler,
1206 static int __init nvme_init(void)
1210 nvme_major = register_blkdev(nvme_major, "nvme");
1211 if (nvme_major <= 0)
1214 result = pci_register_driver(&nvme_driver);
1218 unregister_blkdev(nvme_major, "nvme");
1222 static void __exit nvme_exit(void)
1224 pci_unregister_driver(&nvme_driver);
1225 unregister_blkdev(nvme_major, "nvme");
1228 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
1229 MODULE_LICENSE("GPL");
1230 MODULE_VERSION("0.1");
1231 module_init(nvme_init);
1232 module_exit(nvme_exit);