#include <linux/bio.h>
#include <linux/bitops.h>
#include <linux/blkdev.h>
+#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/genhd.h>
+#include <linux/idr.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
#define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
#define NVME_MINORS 64
-#define IO_TIMEOUT (5 * HZ)
+#define NVME_IO_TIMEOUT (5 * HZ)
#define ADMIN_TIMEOUT (60 * HZ)
static int nvme_major;
struct dma_pool *prp_small_pool;
int instance;
int queue_count;
+ int db_stride;
u32 ctrl_config;
struct msix_entry *entry;
struct nvme_bar __iomem *bar;
BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
}
+typedef void (*nvme_completion_fn)(struct nvme_dev *, void *,
+ struct nvme_completion *);
+
struct nvme_cmd_info {
- unsigned long ctx;
+ nvme_completion_fn fn;
+ void *ctx;
unsigned long timeout;
};
* alloc_cmdid() - Allocate a Command ID
* @nvmeq: The queue that will be used for this command
* @ctx: A pointer that will be passed to the handler
- * @handler: The ID of the handler to call
+ * @handler: The function to call on completion
*
* Allocate a Command ID for a queue. The data passed in will
* be passed to the completion handler. This is implemented by using
* the bottom two bits of the ctx pointer to store the handler ID.
* Passing in a pointer that's not 4-byte aligned will cause a BUG.
* We can change this if it becomes a problem.
+ *
+ * May be called with local interrupts disabled and the q_lock held,
+ * or with interrupts enabled and no locks held.
*/
-static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx, int handler,
- unsigned timeout)
+static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx,
+ nvme_completion_fn handler, unsigned timeout)
{
int depth = nvmeq->q_depth - 1;
struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
int cmdid;
- BUG_ON((unsigned long)ctx & 3);
-
do {
cmdid = find_first_zero_bit(nvmeq->cmdid_data, depth);
if (cmdid >= depth)
return -EBUSY;
} while (test_and_set_bit(cmdid, nvmeq->cmdid_data));
- info[cmdid].ctx = (unsigned long)ctx | handler;
+ info[cmdid].fn = handler;
+ info[cmdid].ctx = ctx;
info[cmdid].timeout = jiffies + timeout;
return cmdid;
}
static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx,
- int handler, unsigned timeout)
+ nvme_completion_fn handler, unsigned timeout)
{
int cmdid;
wait_event_killable(nvmeq->sq_full,
return (cmdid < 0) ? -EINTR : cmdid;
}
-/*
- * If you need more than four handlers, you'll need to change how
- * alloc_cmdid and nvme_process_cq work. Consider using a special
- * CMD_CTX value instead, if that works for your situation.
- */
-enum {
- sync_completion_id = 0,
- bio_completion_id,
-};
-
-/* Special values must be a multiple of 4, and less than 0x1000 */
-#define CMD_CTX_BASE (POISON_POINTER_DELTA + sync_completion_id)
+/* Special values must be less than 0x1000 */
+#define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
#define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
#define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
#define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
#define CMD_CTX_FLUSH (0x318 + CMD_CTX_BASE)
-static unsigned long free_cmdid(struct nvme_queue *nvmeq, int cmdid)
+static void special_completion(struct nvme_dev *dev, void *ctx,
+ struct nvme_completion *cqe)
{
- unsigned long data;
+ if (ctx == CMD_CTX_CANCELLED)
+ return;
+ if (ctx == CMD_CTX_FLUSH)
+ return;
+ if (ctx == CMD_CTX_COMPLETED) {
+ dev_warn(&dev->pci_dev->dev,
+ "completed id %d twice on queue %d\n",
+ cqe->command_id, le16_to_cpup(&cqe->sq_id));
+ return;
+ }
+ if (ctx == CMD_CTX_INVALID) {
+ dev_warn(&dev->pci_dev->dev,
+ "invalid id %d completed on queue %d\n",
+ cqe->command_id, le16_to_cpup(&cqe->sq_id));
+ return;
+ }
+
+ dev_warn(&dev->pci_dev->dev, "Unknown special completion %p\n", ctx);
+}
+
+/*
+ * Called with local interrupts disabled and the q_lock held. May not sleep.
+ */
+static void *free_cmdid(struct nvme_queue *nvmeq, int cmdid,
+ nvme_completion_fn *fn)
+{
+ void *ctx;
struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
- if (cmdid >= nvmeq->q_depth)
+ if (cmdid >= nvmeq->q_depth) {
+ *fn = special_completion;
return CMD_CTX_INVALID;
- data = info[cmdid].ctx;
+ }
+ *fn = info[cmdid].fn;
+ ctx = info[cmdid].ctx;
+ info[cmdid].fn = special_completion;
info[cmdid].ctx = CMD_CTX_COMPLETED;
clear_bit(cmdid, nvmeq->cmdid_data);
wake_up(&nvmeq->sq_full);
- return data;
+ return ctx;
}
-static unsigned long cancel_cmdid(struct nvme_queue *nvmeq, int cmdid)
+static void *cancel_cmdid(struct nvme_queue *nvmeq, int cmdid,
+ nvme_completion_fn *fn)
{
- unsigned long data;
+ void *ctx;
struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
- data = info[cmdid].ctx;
+ if (fn)
+ *fn = info[cmdid].fn;
+ ctx = info[cmdid].ctx;
+ info[cmdid].fn = special_completion;
info[cmdid].ctx = CMD_CTX_CANCELLED;
- return data;
+ return ctx;
}
-static struct nvme_queue *get_nvmeq(struct nvme_ns *ns)
+static struct nvme_queue *get_nvmeq(struct nvme_dev *dev)
{
- return ns->dev->queues[get_cpu() + 1];
+ return dev->queues[get_cpu() + 1];
}
static void put_nvmeq(struct nvme_queue *nvmeq)
return 0;
}
-struct nvme_prps {
- int npages;
+/*
+ * The nvme_iod describes the data in an I/O, including the list of PRP
+ * entries. You can't see it in this data structure because C doesn't let
+ * me express that. Use nvme_alloc_iod to ensure there's enough space
+ * allocated to store the PRP list.
+ */
+struct nvme_iod {
+ void *private; /* For the use of the submitter of the I/O */
+ int npages; /* In the PRP list. 0 means small pool in use */
+ int offset; /* Of PRP list */
+ int nents; /* Used in scatterlist */
+ int length; /* Of data, in bytes */
dma_addr_t first_dma;
- __le64 *list[0];
+ struct scatterlist sg[0];
};
-static void nvme_free_prps(struct nvme_dev *dev, struct nvme_prps *prps)
+static __le64 **iod_list(struct nvme_iod *iod)
{
- const int last_prp = PAGE_SIZE / 8 - 1;
- int i;
- dma_addr_t prp_dma;
+ return ((void *)iod) + iod->offset;
+}
- if (!prps)
- return;
+/*
+ * Will slightly overestimate the number of pages needed. This is OK
+ * as it only leads to a small amount of wasted memory for the lifetime of
+ * the I/O.
+ */
+static int nvme_npages(unsigned size)
+{
+ unsigned nprps = DIV_ROUND_UP(size + PAGE_SIZE, PAGE_SIZE);
+ return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
+}
+
+static struct nvme_iod *
+nvme_alloc_iod(unsigned nseg, unsigned nbytes, gfp_t gfp)
+{
+ struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) +
+ sizeof(__le64 *) * nvme_npages(nbytes) +
+ sizeof(struct scatterlist) * nseg, gfp);
+
+ if (iod) {
+ iod->offset = offsetof(struct nvme_iod, sg[nseg]);
+ iod->npages = -1;
+ iod->length = nbytes;
+ }
- prp_dma = prps->first_dma;
+ return iod;
+}
- if (prps->npages == 0)
- dma_pool_free(dev->prp_small_pool, prps->list[0], prp_dma);
- for (i = 0; i < prps->npages; i++) {
- __le64 *prp_list = prps->list[i];
+static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
+{
+ const int last_prp = PAGE_SIZE / 8 - 1;
+ int i;
+ __le64 **list = iod_list(iod);
+ dma_addr_t prp_dma = iod->first_dma;
+
+ if (iod->npages == 0)
+ dma_pool_free(dev->prp_small_pool, list[0], prp_dma);
+ for (i = 0; i < iod->npages; i++) {
+ __le64 *prp_list = list[i];
dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]);
dma_pool_free(dev->prp_page_pool, prp_list, prp_dma);
prp_dma = next_prp_dma;
}
- kfree(prps);
+ kfree(iod);
}
-struct nvme_bio {
- struct bio *bio;
- int nents;
- struct nvme_prps *prps;
- struct scatterlist sg[0];
-};
-
-/* XXX: use a mempool */
-static struct nvme_bio *alloc_nbio(unsigned nseg, gfp_t gfp)
-{
- return kzalloc(sizeof(struct nvme_bio) +
- sizeof(struct scatterlist) * nseg, gfp);
-}
-
-static void free_nbio(struct nvme_queue *nvmeq, struct nvme_bio *nbio)
+static void requeue_bio(struct nvme_dev *dev, struct bio *bio)
{
- nvme_free_prps(nvmeq->dev, nbio->prps);
- kfree(nbio);
+ struct nvme_queue *nvmeq = get_nvmeq(dev);
+ if (bio_list_empty(&nvmeq->sq_cong))
+ add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait);
+ bio_list_add(&nvmeq->sq_cong, bio);
+ put_nvmeq(nvmeq);
+ wake_up_process(nvme_thread);
}
-static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
+static void bio_completion(struct nvme_dev *dev, void *ctx,
struct nvme_completion *cqe)
{
- struct nvme_bio *nbio = ctx;
- struct bio *bio = nbio->bio;
+ struct nvme_iod *iod = ctx;
+ struct bio *bio = iod->private;
u16 status = le16_to_cpup(&cqe->status) >> 1;
- dma_unmap_sg(nvmeq->q_dmadev, nbio->sg, nbio->nents,
+ dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
- free_nbio(nvmeq, nbio);
+ nvme_free_iod(dev, iod);
if (status) {
bio_endio(bio, -EIO);
} else if (bio->bi_vcnt > bio->bi_idx) {
- bio_list_add(&nvmeq->sq_cong, bio);
- wake_up_process(nvme_thread);
+ requeue_bio(dev, bio);
} else {
bio_endio(bio, 0);
}
}
-/* length is in bytes */
-static struct nvme_prps *nvme_setup_prps(struct nvme_dev *dev,
- struct nvme_common_command *cmd,
- struct scatterlist *sg, int length)
+/* length is in bytes. gfp flags indicates whether we may sleep. */
+static int nvme_setup_prps(struct nvme_dev *dev,
+ struct nvme_common_command *cmd, struct nvme_iod *iod,
+ int total_len, gfp_t gfp)
{
struct dma_pool *pool;
+ int length = total_len;
+ struct scatterlist *sg = iod->sg;
int dma_len = sg_dma_len(sg);
u64 dma_addr = sg_dma_address(sg);
int offset = offset_in_page(dma_addr);
__le64 *prp_list;
+ __le64 **list = iod_list(iod);
dma_addr_t prp_dma;
- int nprps, npages, i, prp_page;
- struct nvme_prps *prps = NULL;
+ int nprps, i;
cmd->prp1 = cpu_to_le64(dma_addr);
length -= (PAGE_SIZE - offset);
if (length <= 0)
- return prps;
+ return total_len;
dma_len -= (PAGE_SIZE - offset);
if (dma_len) {
if (length <= PAGE_SIZE) {
cmd->prp2 = cpu_to_le64(dma_addr);
- return prps;
+ return total_len;
}
nprps = DIV_ROUND_UP(length, PAGE_SIZE);
- npages = DIV_ROUND_UP(8 * nprps, PAGE_SIZE);
- prps = kmalloc(sizeof(*prps) + sizeof(__le64 *) * npages, GFP_ATOMIC);
- prp_page = 0;
if (nprps <= (256 / 8)) {
pool = dev->prp_small_pool;
- prps->npages = 0;
+ iod->npages = 0;
} else {
pool = dev->prp_page_pool;
- prps->npages = npages;
+ iod->npages = 1;
}
- prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
- prps->list[prp_page++] = prp_list;
- prps->first_dma = prp_dma;
+ prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
+ if (!prp_list) {
+ cmd->prp2 = cpu_to_le64(dma_addr);
+ iod->npages = -1;
+ return (total_len - length) + PAGE_SIZE;
+ }
+ list[0] = prp_list;
+ iod->first_dma = prp_dma;
cmd->prp2 = cpu_to_le64(prp_dma);
i = 0;
for (;;) {
if (i == PAGE_SIZE / 8) {
__le64 *old_prp_list = prp_list;
- prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
- prps->list[prp_page++] = prp_list;
+ prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
+ if (!prp_list)
+ return total_len - length;
+ list[iod->npages++] = prp_list;
prp_list[0] = old_prp_list[i - 1];
old_prp_list[i - 1] = cpu_to_le64(prp_dma);
i = 1;
dma_len = sg_dma_len(sg);
}
- return prps;
+ return total_len;
}
/* NVMe scatterlists require no holes in the virtual address */
#define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
(((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
-static int nvme_map_bio(struct device *dev, struct nvme_bio *nbio,
+static int nvme_map_bio(struct device *dev, struct nvme_iod *iod,
struct bio *bio, enum dma_data_direction dma_dir, int psegs)
{
struct bio_vec *bvec, *bvprv = NULL;
struct scatterlist *sg = NULL;
int i, old_idx, length = 0, nsegs = 0;
- sg_init_table(nbio->sg, psegs);
+ sg_init_table(iod->sg, psegs);
old_idx = bio->bi_idx;
bio_for_each_segment(bvec, bio, i) {
if (bvprv && BIOVEC_PHYS_MERGEABLE(bvprv, bvec)) {
} else {
if (bvprv && BIOVEC_NOT_VIRT_MERGEABLE(bvprv, bvec))
break;
- sg = sg ? sg + 1 : nbio->sg;
+ sg = sg ? sg + 1 : iod->sg;
sg_set_page(sg, bvec->bv_page, bvec->bv_len,
bvec->bv_offset);
nsegs++;
bvprv = bvec;
}
bio->bi_idx = i;
- nbio->nents = nsegs;
+ iod->nents = nsegs;
sg_mark_end(sg);
- if (dma_map_sg(dev, nbio->sg, nbio->nents, dma_dir) == 0) {
+ if (dma_map_sg(dev, iod->sg, iod->nents, dma_dir) == 0) {
bio->bi_idx = old_idx;
return -ENOMEM;
}
static int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns)
{
int cmdid = alloc_cmdid(nvmeq, (void *)CMD_CTX_FLUSH,
- sync_completion_id, IO_TIMEOUT);
+ special_completion, NVME_IO_TIMEOUT);
if (unlikely(cmdid < 0))
return cmdid;
return nvme_submit_flush(nvmeq, ns, cmdid);
}
+/*
+ * Called with local interrupts disabled and the q_lock held. May not sleep.
+ */
static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
struct bio *bio)
{
struct nvme_command *cmnd;
- struct nvme_bio *nbio;
+ struct nvme_iod *iod;
enum dma_data_direction dma_dir;
int cmdid, length, result = -ENOMEM;
u16 control;
return result;
}
- nbio = alloc_nbio(psegs, GFP_ATOMIC);
- if (!nbio)
+ iod = nvme_alloc_iod(psegs, bio->bi_size, GFP_ATOMIC);
+ if (!iod)
goto nomem;
- nbio->bio = bio;
+ iod->private = bio;
result = -EBUSY;
- cmdid = alloc_cmdid(nvmeq, nbio, bio_completion_id, IO_TIMEOUT);
+ cmdid = alloc_cmdid(nvmeq, iod, bio_completion, NVME_IO_TIMEOUT);
if (unlikely(cmdid < 0))
- goto free_nbio;
+ goto free_iod;
if ((bio->bi_rw & REQ_FLUSH) && !psegs)
return nvme_submit_flush(nvmeq, ns, cmdid);
dma_dir = DMA_FROM_DEVICE;
}
- result = nvme_map_bio(nvmeq->q_dmadev, nbio, bio, dma_dir, psegs);
+ result = nvme_map_bio(nvmeq->q_dmadev, iod, bio, dma_dir, psegs);
if (result < 0)
- goto free_nbio;
+ goto free_iod;
length = result;
cmnd->rw.command_id = cmdid;
cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
- nbio->prps = nvme_setup_prps(nvmeq->dev, &cmnd->common, nbio->sg,
- length);
+ length = nvme_setup_prps(nvmeq->dev, &cmnd->common, iod, length,
+ GFP_ATOMIC);
cmnd->rw.slba = cpu_to_le64(bio->bi_sector >> (ns->lba_shift - 9));
cmnd->rw.length = cpu_to_le16((length >> ns->lba_shift) - 1);
cmnd->rw.control = cpu_to_le16(control);
return 0;
- free_nbio:
- free_nbio(nvmeq, nbio);
+ free_iod:
+ nvme_free_iod(nvmeq->dev, iod);
nomem:
return result;
}
-/*
- * NB: return value of non-zero would mean that we were a stacking driver.
- * make_request must always succeed.
- */
-static int nvme_make_request(struct request_queue *q, struct bio *bio)
+static void nvme_make_request(struct request_queue *q, struct bio *bio)
{
struct nvme_ns *ns = q->queuedata;
- struct nvme_queue *nvmeq = get_nvmeq(ns);
+ struct nvme_queue *nvmeq = get_nvmeq(ns->dev);
int result = -EBUSY;
spin_lock_irq(&nvmeq->q_lock);
spin_unlock_irq(&nvmeq->q_lock);
put_nvmeq(nvmeq);
-
- return 0;
-}
-
-struct sync_cmd_info {
- struct task_struct *task;
- u32 result;
- int status;
-};
-
-static void sync_completion(struct nvme_queue *nvmeq, void *ctx,
- struct nvme_completion *cqe)
-{
- struct sync_cmd_info *cmdinfo = ctx;
- if (unlikely((unsigned long)cmdinfo == CMD_CTX_CANCELLED))
- return;
- if ((unsigned long)cmdinfo == CMD_CTX_FLUSH)
- return;
- if (unlikely((unsigned long)cmdinfo == CMD_CTX_COMPLETED)) {
- dev_warn(nvmeq->q_dmadev,
- "completed id %d twice on queue %d\n",
- cqe->command_id, le16_to_cpup(&cqe->sq_id));
- return;
- }
- if (unlikely((unsigned long)cmdinfo == CMD_CTX_INVALID)) {
- dev_warn(nvmeq->q_dmadev,
- "invalid id %d completed on queue %d\n",
- cqe->command_id, le16_to_cpup(&cqe->sq_id));
- return;
- }
- cmdinfo->result = le32_to_cpup(&cqe->result);
- cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
- wake_up_process(cmdinfo->task);
}
-typedef void (*completion_fn)(struct nvme_queue *, void *,
- struct nvme_completion *);
-
-static const completion_fn nvme_completions[4] = {
- [sync_completion_id] = sync_completion,
- [bio_completion_id] = bio_completion,
-};
-
static irqreturn_t nvme_process_cq(struct nvme_queue *nvmeq)
{
u16 head, phase;
phase = nvmeq->cq_phase;
for (;;) {
- unsigned long data;
- void *ptr;
- unsigned char handler;
+ void *ctx;
+ nvme_completion_fn fn;
struct nvme_completion cqe = nvmeq->cqes[head];
if ((le16_to_cpu(cqe.status) & 1) != phase)
break;
phase = !phase;
}
- data = free_cmdid(nvmeq, cqe.command_id);
- handler = data & 3;
- ptr = (void *)(data & ~3UL);
- nvme_completions[handler](nvmeq, ptr, &cqe);
+ ctx = free_cmdid(nvmeq, cqe.command_id, &fn);
+ fn(nvmeq->dev, ctx, &cqe);
}
/* If the controller ignores the cq head doorbell and continuously
if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
return IRQ_NONE;
- writel(head, nvmeq->q_db + 1);
+ writel(head, nvmeq->q_db + (1 << nvmeq->dev->db_stride));
nvmeq->cq_head = head;
nvmeq->cq_phase = phase;
static void nvme_abort_command(struct nvme_queue *nvmeq, int cmdid)
{
spin_lock_irq(&nvmeq->q_lock);
- cancel_cmdid(nvmeq, cmdid);
+ cancel_cmdid(nvmeq, cmdid, NULL);
spin_unlock_irq(&nvmeq->q_lock);
}
+struct sync_cmd_info {
+ struct task_struct *task;
+ u32 result;
+ int status;
+};
+
+static void sync_completion(struct nvme_dev *dev, void *ctx,
+ struct nvme_completion *cqe)
+{
+ struct sync_cmd_info *cmdinfo = ctx;
+ cmdinfo->result = le32_to_cpup(&cqe->result);
+ cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
+ wake_up_process(cmdinfo->task);
+}
+
/*
* Returns 0 on success. If the result is negative, it's a Linux error code;
* if the result is positive, it's an NVM Express status code
cmdinfo.task = current;
cmdinfo.status = -EINTR;
- cmdid = alloc_cmdid_killable(nvmeq, &cmdinfo, sync_completion_id,
+ cmdid = alloc_cmdid_killable(nvmeq, &cmdinfo, sync_completion,
timeout);
if (cmdid < 0)
return cmdid;
return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid);
}
+static int nvme_identify(struct nvme_dev *dev, unsigned nsid, unsigned cns,
+ dma_addr_t dma_addr)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+ c.identify.opcode = nvme_admin_identify;
+ c.identify.nsid = cpu_to_le32(nsid);
+ c.identify.prp1 = cpu_to_le64(dma_addr);
+ c.identify.cns = cpu_to_le32(cns);
+
+ return nvme_submit_admin_cmd(dev, &c, NULL);
+}
+
+static int nvme_get_features(struct nvme_dev *dev, unsigned fid,
+ unsigned dword11, dma_addr_t dma_addr)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+ c.features.opcode = nvme_admin_get_features;
+ c.features.prp1 = cpu_to_le64(dma_addr);
+ c.features.fid = cpu_to_le32(fid);
+ c.features.dword11 = cpu_to_le32(dword11);
+
+ return nvme_submit_admin_cmd(dev, &c, NULL);
+}
+
+static int nvme_set_features(struct nvme_dev *dev, unsigned fid,
+ unsigned dword11, dma_addr_t dma_addr, u32 *result)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+ c.features.opcode = nvme_admin_set_features;
+ c.features.prp1 = cpu_to_le64(dma_addr);
+ c.features.fid = cpu_to_le32(fid);
+ c.features.dword11 = cpu_to_le32(dword11);
+
+ return nvme_submit_admin_cmd(dev, &c, result);
+}
+
static void nvme_free_queue(struct nvme_dev *dev, int qid)
{
struct nvme_queue *nvmeq = dev->queues[qid];
init_waitqueue_head(&nvmeq->sq_full);
init_waitqueue_entry(&nvmeq->sq_cong_wait, nvme_thread);
bio_list_init(&nvmeq->sq_cong);
- nvmeq->q_db = &dev->dbs[qid * 2];
+ nvmeq->q_db = &dev->dbs[qid << (dev->db_stride + 1)];
nvmeq->q_depth = depth;
nvmeq->cq_vector = vector;
struct nvme_queue *nvmeq = nvme_alloc_queue(dev, qid, cq_size, vector);
if (!nvmeq)
- return NULL;
+ return ERR_PTR(-ENOMEM);
result = adapter_alloc_cq(dev, qid, nvmeq);
if (result < 0)
dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
nvmeq->sq_cmds, nvmeq->sq_dma_addr);
kfree(nvmeq);
- return NULL;
+ return ERR_PTR(result);
}
static int __devinit nvme_configure_admin_queue(struct nvme_dev *dev)
cap = readq(&dev->bar->cap);
timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
+ dev->db_stride = NVME_CAP_STRIDE(cap);
while (!(readl(&dev->bar->csts) & NVME_CSTS_RDY)) {
msleep(100);
return result;
}
-static int nvme_map_user_pages(struct nvme_dev *dev, int write,
- unsigned long addr, unsigned length,
- struct scatterlist **sgp)
+static struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
+ unsigned long addr, unsigned length)
{
int i, err, count, nents, offset;
struct scatterlist *sg;
struct page **pages;
+ struct nvme_iod *iod;
if (addr & 3)
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
if (!length)
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
offset = offset_in_page(addr);
count = DIV_ROUND_UP(offset + length, PAGE_SIZE);
goto put_pages;
}
- sg = kcalloc(count, sizeof(*sg), GFP_KERNEL);
+ iod = nvme_alloc_iod(count, length, GFP_KERNEL);
+ sg = iod->sg;
sg_init_table(sg, count);
- sg_set_page(&sg[0], pages[0], PAGE_SIZE - offset, offset);
- length -= (PAGE_SIZE - offset);
- for (i = 1; i < count; i++) {
- sg_set_page(&sg[i], pages[i], min_t(int, length, PAGE_SIZE), 0);
- length -= PAGE_SIZE;
+ for (i = 0; i < count; i++) {
+ sg_set_page(&sg[i], pages[i],
+ min_t(int, length, PAGE_SIZE - offset), offset);
+ length -= (PAGE_SIZE - offset);
+ offset = 0;
}
+ sg_mark_end(&sg[i - 1]);
+ iod->nents = count;
err = -ENOMEM;
nents = dma_map_sg(&dev->pci_dev->dev, sg, count,
write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
if (!nents)
- goto put_pages;
+ goto free_iod;
kfree(pages);
- *sgp = sg;
- return nents;
+ return iod;
+ free_iod:
+ kfree(iod);
put_pages:
for (i = 0; i < count; i++)
put_page(pages[i]);
kfree(pages);
- return err;
+ return ERR_PTR(err);
}
static void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
- unsigned long addr, int length,
- struct scatterlist *sg, int nents)
-{
- int i, count;
-
- count = DIV_ROUND_UP(offset_in_page(addr) + length, PAGE_SIZE);
- dma_unmap_sg(&dev->pci_dev->dev, sg, nents, DMA_FROM_DEVICE);
-
- for (i = 0; i < count; i++)
- put_page(sg_page(&sg[i]));
-}
-
-static int nvme_submit_user_admin_command(struct nvme_dev *dev,
- unsigned long addr, unsigned length,
- struct nvme_command *cmd)
+ struct nvme_iod *iod)
{
- int err, nents;
- struct scatterlist *sg;
- struct nvme_prps *prps;
-
- nents = nvme_map_user_pages(dev, 0, addr, length, &sg);
- if (nents < 0)
- return nents;
- prps = nvme_setup_prps(dev, &cmd->common, sg, length);
- err = nvme_submit_admin_cmd(dev, cmd, NULL);
- nvme_unmap_user_pages(dev, 0, addr, length, sg, nents);
- nvme_free_prps(dev, prps);
- return err ? -EIO : 0;
-}
-
-static int nvme_identify(struct nvme_ns *ns, unsigned long addr, int cns)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.identify.opcode = nvme_admin_identify;
- c.identify.nsid = cns ? 0 : cpu_to_le32(ns->ns_id);
- c.identify.cns = cpu_to_le32(cns);
-
- return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c);
-}
-
-static int nvme_get_range_type(struct nvme_ns *ns, unsigned long addr)
-{
- struct nvme_command c;
+ int i;
- memset(&c, 0, sizeof(c));
- c.features.opcode = nvme_admin_get_features;
- c.features.nsid = cpu_to_le32(ns->ns_id);
- c.features.fid = cpu_to_le32(NVME_FEAT_LBA_RANGE);
+ dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
+ write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
- return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c);
+ for (i = 0; i < iod->nents; i++)
+ put_page(sg_page(&iod->sg[i]));
}
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
struct nvme_user_io io;
struct nvme_command c;
unsigned length;
- int nents, status;
- struct scatterlist *sg;
- struct nvme_prps *prps;
+ int status;
+ struct nvme_iod *iod;
if (copy_from_user(&io, uio, sizeof(io)))
return -EFAULT;
switch (io.opcode) {
case nvme_cmd_write:
case nvme_cmd_read:
- nents = nvme_map_user_pages(dev, io.opcode & 1, io.addr,
- length, &sg);
+ case nvme_cmd_compare:
+ iod = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length);
+ break;
default:
- return -EFAULT;
+ return -EINVAL;
}
- if (nents < 0)
- return nents;
+ if (IS_ERR(iod))
+ return PTR_ERR(iod);
memset(&c, 0, sizeof(c));
c.rw.opcode = io.opcode;
c.rw.apptag = io.apptag;
c.rw.appmask = io.appmask;
/* XXX: metadata */
- prps = nvme_setup_prps(dev, &c.common, sg, length);
+ length = nvme_setup_prps(dev, &c.common, iod, length, GFP_KERNEL);
- nvmeq = get_nvmeq(ns);
+ nvmeq = get_nvmeq(dev);
/*
* Since nvme_submit_sync_cmd sleeps, we can't keep preemption
* disabled. We may be preempted at any point, and be rescheduled
* additional races since q_lock already protects against other CPUs.
*/
put_nvmeq(nvmeq);
- status = nvme_submit_sync_cmd(nvmeq, &c, NULL, IO_TIMEOUT);
+ if (length != (io.nblocks + 1) << ns->lba_shift)
+ status = -ENOMEM;
+ else
+ status = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
- nvme_unmap_user_pages(dev, io.opcode & 1, io.addr, length, sg, nents);
- nvme_free_prps(dev, prps);
+ nvme_unmap_user_pages(dev, io.opcode & 1, iod);
+ nvme_free_iod(dev, iod);
return status;
}
-static int nvme_download_firmware(struct nvme_ns *ns,
- struct nvme_dlfw __user *udlfw)
+static int nvme_user_admin_cmd(struct nvme_ns *ns,
+ struct nvme_admin_cmd __user *ucmd)
{
struct nvme_dev *dev = ns->dev;
- struct nvme_dlfw dlfw;
+ struct nvme_admin_cmd cmd;
struct nvme_command c;
- int nents, status;
- struct scatterlist *sg;
- struct nvme_prps *prps;
+ int status, length;
+ struct nvme_iod *iod;
- if (copy_from_user(&dlfw, udlfw, sizeof(dlfw)))
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
return -EFAULT;
- if (dlfw.length >= (1 << 30))
- return -EINVAL;
-
- nents = nvme_map_user_pages(dev, 1, dlfw.addr, dlfw.length * 4, &sg);
- if (nents < 0)
- return nents;
memset(&c, 0, sizeof(c));
- c.dlfw.opcode = nvme_admin_download_fw;
- c.dlfw.numd = cpu_to_le32(dlfw.length);
- c.dlfw.offset = cpu_to_le32(dlfw.offset);
- prps = nvme_setup_prps(dev, &c.common, sg, dlfw.length * 4);
-
- status = nvme_submit_admin_cmd(dev, &c, NULL);
- nvme_unmap_user_pages(dev, 0, dlfw.addr, dlfw.length * 4, sg, nents);
- nvme_free_prps(dev, prps);
- return status;
-}
-
-static int nvme_activate_firmware(struct nvme_ns *ns, unsigned long arg)
-{
- struct nvme_dev *dev = ns->dev;
- struct nvme_command c;
+ c.common.opcode = cmd.opcode;
+ c.common.flags = cmd.flags;
+ c.common.nsid = cpu_to_le32(cmd.nsid);
+ c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
+ c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
+ c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
+ c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
+ c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
+ c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
+ c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
+ c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
+
+ length = cmd.data_len;
+ if (cmd.data_len) {
+ iod = nvme_map_user_pages(dev, cmd.opcode & 1, cmd.addr,
+ length);
+ if (IS_ERR(iod))
+ return PTR_ERR(iod);
+ length = nvme_setup_prps(dev, &c.common, iod, length,
+ GFP_KERNEL);
+ }
- memset(&c, 0, sizeof(c));
- c.common.opcode = nvme_admin_activate_fw;
- c.common.rsvd10[0] = cpu_to_le32(arg);
+ if (length != cmd.data_len)
+ status = -ENOMEM;
+ else
+ status = nvme_submit_admin_cmd(dev, &c, NULL);
- return nvme_submit_admin_cmd(dev, &c, NULL);
+ if (cmd.data_len) {
+ nvme_unmap_user_pages(dev, cmd.opcode & 1, iod);
+ nvme_free_iod(dev, iod);
+ }
+ return status;
}
static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
struct nvme_ns *ns = bdev->bd_disk->private_data;
switch (cmd) {
- case NVME_IOCTL_IDENTIFY_NS:
- return nvme_identify(ns, arg, 0);
- case NVME_IOCTL_IDENTIFY_CTRL:
- return nvme_identify(ns, arg, 1);
- case NVME_IOCTL_GET_RANGE_TYPE:
- return nvme_get_range_type(ns, arg);
+ case NVME_IOCTL_ID:
+ return ns->ns_id;
+ case NVME_IOCTL_ADMIN_CMD:
+ return nvme_user_admin_cmd(ns, (void __user *)arg);
case NVME_IOCTL_SUBMIT_IO:
return nvme_submit_io(ns, (void __user *)arg);
- case NVME_IOCTL_DOWNLOAD_FW:
- return nvme_download_firmware(ns, (void __user *)arg);
- case NVME_IOCTL_ACTIVATE_FW:
- return nvme_activate_firmware(ns, arg);
default:
return -ENOTTY;
}
int cmdid;
for_each_set_bit(cmdid, nvmeq->cmdid_data, depth) {
- unsigned long data;
- void *ptr;
- unsigned char handler;
+ void *ctx;
+ nvme_completion_fn fn;
static struct nvme_completion cqe = { .status = cpu_to_le16(NVME_SC_ABORT_REQ) << 1, };
if (!time_after(now, info[cmdid].timeout))
continue;
dev_warn(nvmeq->q_dmadev, "Timing out I/O %d\n", cmdid);
- data = cancel_cmdid(nvmeq, cmdid);
- handler = data & 3;
- ptr = (void *)(data & ~3UL);
- nvme_completions[handler](nvmeq, ptr, &cqe);
+ ctx = cancel_cmdid(nvmeq, cmdid, &fn);
+ fn(nvmeq->dev, ctx, &cqe);
}
}
return 0;
}
-static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, int index,
+static DEFINE_IDA(nvme_index_ida);
+
+static int nvme_get_ns_idx(void)
+{
+ int index, error;
+
+ do {
+ if (!ida_pre_get(&nvme_index_ida, GFP_KERNEL))
+ return -1;
+
+ spin_lock(&dev_list_lock);
+ error = ida_get_new(&nvme_index_ida, &index);
+ spin_unlock(&dev_list_lock);
+ } while (error == -EAGAIN);
+
+ if (error)
+ index = -1;
+ return index;
+}
+
+static void nvme_put_ns_idx(int index)
+{
+ spin_lock(&dev_list_lock);
+ ida_remove(&nvme_index_ida, index);
+ spin_unlock(&dev_list_lock);
+}
+
+static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, int nsid,
struct nvme_id_ns *id, struct nvme_lba_range_type *rt)
{
struct nvme_ns *ns;
ns->queue = blk_alloc_queue(GFP_KERNEL);
if (!ns->queue)
goto out_free_ns;
- ns->queue->queue_flags = QUEUE_FLAG_DEFAULT | QUEUE_FLAG_NOMERGES |
- QUEUE_FLAG_NONROT | QUEUE_FLAG_DISCARD;
+ ns->queue->queue_flags = QUEUE_FLAG_DEFAULT;
+ queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue);
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
+/* queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); */
blk_queue_make_request(ns->queue, nvme_make_request);
ns->dev = dev;
ns->queue->queuedata = ns;
disk = alloc_disk(NVME_MINORS);
if (!disk)
goto out_free_queue;
- ns->ns_id = index;
+ ns->ns_id = nsid;
ns->disk = disk;
lbaf = id->flbas & 0xf;
ns->lba_shift = id->lbaf[lbaf].ds;
disk->major = nvme_major;
disk->minors = NVME_MINORS;
- disk->first_minor = NVME_MINORS * index;
+ disk->first_minor = NVME_MINORS * nvme_get_ns_idx();
disk->fops = &nvme_fops;
disk->private_data = ns;
disk->queue = ns->queue;
disk->driverfs_dev = &dev->pci_dev->dev;
- sprintf(disk->disk_name, "nvme%dn%d", dev->instance, index);
+ sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid);
set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
return ns;
static void nvme_ns_free(struct nvme_ns *ns)
{
+ int index = ns->disk->first_minor / NVME_MINORS;
put_disk(ns->disk);
+ nvme_put_ns_idx(index);
blk_cleanup_queue(ns->queue);
kfree(ns);
}
{
int status;
u32 result;
- struct nvme_command c;
u32 q_count = (count - 1) | ((count - 1) << 16);
- memset(&c, 0, sizeof(c));
- c.features.opcode = nvme_admin_get_features;
- c.features.fid = cpu_to_le32(NVME_FEAT_NUM_QUEUES);
- c.features.dword11 = cpu_to_le32(q_count);
-
- status = nvme_submit_admin_cmd(dev, &c, &result);
+ status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0,
+ &result);
if (status)
return -EIO;
return min(result & 0xffff, result >> 16) + 1;
static int __devinit nvme_setup_io_queues(struct nvme_dev *dev)
{
- int result, cpu, i, nr_io_queues;
+ int result, cpu, i, nr_io_queues, db_bar_size;
nr_io_queues = num_online_cpus();
result = set_queue_count(dev, nr_io_queues);
/* Deregister the admin queue's interrupt */
free_irq(dev->entry[0].vector, dev->queues[0]);
+ db_bar_size = 4096 + ((nr_io_queues + 1) << (dev->db_stride + 3));
+ if (db_bar_size > 8192) {
+ iounmap(dev->bar);
+ dev->bar = ioremap(pci_resource_start(dev->pci_dev, 0),
+ db_bar_size);
+ dev->dbs = ((void __iomem *)dev->bar) + 4096;
+ dev->queues[0]->q_db = dev->dbs;
+ }
+
for (i = 0; i < nr_io_queues; i++)
dev->entry[i].entry = i;
for (;;) {
for (i = 0; i < nr_io_queues; i++) {
dev->queues[i + 1] = nvme_create_queue(dev, i + 1,
NVME_Q_DEPTH, i);
- if (!dev->queues[i + 1])
- return -ENOMEM;
+ if (IS_ERR(dev->queues[i + 1]))
+ return PTR_ERR(dev->queues[i + 1]);
dev->queue_count++;
}
int res, nn, i;
struct nvme_ns *ns, *next;
struct nvme_id_ctrl *ctrl;
- void *id;
+ struct nvme_id_ns *id_ns;
+ void *mem;
dma_addr_t dma_addr;
- struct nvme_command cid, crt;
res = nvme_setup_io_queues(dev);
if (res)
return res;
- /* XXX: Switch to a SG list once prp2 works */
- id = dma_alloc_coherent(&dev->pci_dev->dev, 8192, &dma_addr,
+ mem = dma_alloc_coherent(&dev->pci_dev->dev, 8192, &dma_addr,
GFP_KERNEL);
- memset(&cid, 0, sizeof(cid));
- cid.identify.opcode = nvme_admin_identify;
- cid.identify.nsid = 0;
- cid.identify.prp1 = cpu_to_le64(dma_addr);
- cid.identify.cns = cpu_to_le32(1);
-
- res = nvme_submit_admin_cmd(dev, &cid, NULL);
+ res = nvme_identify(dev, 0, 1, dma_addr);
if (res) {
res = -EIO;
goto out_free;
}
- ctrl = id;
+ ctrl = mem;
nn = le32_to_cpup(&ctrl->nn);
memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
- cid.identify.cns = 0;
- memset(&crt, 0, sizeof(crt));
- crt.features.opcode = nvme_admin_get_features;
- crt.features.prp1 = cpu_to_le64(dma_addr + 4096);
- crt.features.fid = cpu_to_le32(NVME_FEAT_LBA_RANGE);
-
- for (i = 0; i <= nn; i++) {
- cid.identify.nsid = cpu_to_le32(i);
- res = nvme_submit_admin_cmd(dev, &cid, NULL);
+ id_ns = mem;
+ for (i = 1; i <= nn; i++) {
+ res = nvme_identify(dev, i, 0, dma_addr);
if (res)
continue;
- if (((struct nvme_id_ns *)id)->ncap == 0)
+ if (id_ns->ncap == 0)
continue;
- crt.features.nsid = cpu_to_le32(i);
- res = nvme_submit_admin_cmd(dev, &crt, NULL);
+ res = nvme_get_features(dev, NVME_FEAT_LBA_RANGE, i,
+ dma_addr + 4096);
if (res)
continue;
- ns = nvme_alloc_ns(dev, i, id, id + 4096);
+ ns = nvme_alloc_ns(dev, i, mem, mem + 4096);
if (ns)
list_add_tail(&ns->list, &dev->namespaces);
}
list_for_each_entry(ns, &dev->namespaces, list)
add_disk(ns->disk);
- dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr);
- return 0;
+ goto out;
out_free:
list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
nvme_ns_free(ns);
}
- dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr);
+ out:
+ dma_free_coherent(&dev->pci_dev->dev, 8192, mem, dma_addr);
return res;
}
MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
MODULE_LICENSE("GPL");
-MODULE_VERSION("0.5");
+MODULE_VERSION("0.8");
module_init(nvme_init);
module_exit(nvme_exit);