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nvme: merge iod and cmd_info

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Merge the two per-request structures in the nvme driver into a single
one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-11-28 15:43:10 +01:00 committed by Jens Axboe
parent bf68405705
commit f4800d6d15
1 changed files with 73 additions and 111 deletions
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184
drivers/nvme/host/pci.c
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@ -164,18 +164,19 @@ struct nvme_queue {
/*
* 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
* me express that. Use nvme_init_iod to ensure there's enough space
* allocated to store the PRP list.
*/
struct nvme_iod {
unsigned long private; /* For the use of the submitter of the I/O */
struct nvme_queue *nvmeq;
int aborted;
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;
struct scatterlist meta_sg; /* metadata requires single contiguous buffer */
struct scatterlist sg[0];
struct scatterlist *sg;
struct scatterlist inline_sg[0];
};
/*
@ -197,19 +198,11 @@ static inline void _nvme_check_size(void)
BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
}
struct nvme_cmd_info {
int aborted;
struct nvme_queue *nvmeq;
struct nvme_iod *iod;
struct nvme_iod __iod;
};
/*
* Max size of iod being embedded in the request payload
*/
#define NVME_INT_PAGES 2
#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size)
#define NVME_INT_MASK 0x01
/*
* Will slightly overestimate the number of pages needed. This is OK
@ -223,15 +216,17 @@ static int nvme_npages(unsigned size, struct nvme_dev *dev)
return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
}
static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev,
unsigned int size, unsigned int nseg)
{
return sizeof(__le64 *) * nvme_npages(size, dev) +
sizeof(struct scatterlist) * nseg;
}
static unsigned int nvme_cmd_size(struct nvme_dev *dev)
{
unsigned int ret = sizeof(struct nvme_cmd_info);
ret += sizeof(struct nvme_iod);
ret += sizeof(__le64 *) * nvme_npages(NVME_INT_BYTES(dev), dev);
ret += sizeof(struct scatterlist) * NVME_INT_PAGES;
return ret;
return sizeof(struct nvme_iod) +
nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES);
}
static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
@ -261,11 +256,11 @@ static int nvme_admin_init_request(void *data, struct request *req,
unsigned int numa_node)
{
struct nvme_dev *dev = data;
struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct nvme_queue *nvmeq = dev->queues[0];
BUG_ON(!nvmeq);
cmd->nvmeq = nvmeq;
iod->nvmeq = nvmeq;
return 0;
}
@ -288,27 +283,14 @@ static int nvme_init_request(void *data, struct request *req,
unsigned int numa_node)
{
struct nvme_dev *dev = data;
struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];
BUG_ON(!nvmeq);
cmd->nvmeq = nvmeq;
iod->nvmeq = nvmeq;
return 0;
}
static void *iod_get_private(struct nvme_iod *iod)
{
return (void *) (iod->private & ~0x1UL);
}
/*
* If bit 0 is set, the iod is embedded in the request payload.
*/
static bool iod_should_kfree(struct nvme_iod *iod)
{
return (iod->private & NVME_INT_MASK) == 0;
}
static void nvme_complete_async_event(struct nvme_dev *dev,
struct nvme_completion *cqe)
{
@ -352,61 +334,44 @@ static void __nvme_submit_cmd(struct nvme_queue *nvmeq,
nvmeq->sq_tail = tail;
}
static __le64 **iod_list(struct nvme_iod *iod)
static __le64 **iod_list(struct request *req)
{
return ((void *)iod) + iod->offset;
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
return (__le64 **)(iod->sg + req->nr_phys_segments);
}
static inline void iod_init(struct nvme_iod *iod, unsigned nbytes,
unsigned nseg, unsigned long private)
static int nvme_init_iod(struct request *rq, struct nvme_dev *dev)
{
iod->private = private;
iod->offset = offsetof(struct nvme_iod, sg[nseg]);
iod->npages = -1;
iod->length = nbytes;
iod->nents = 0;
}
struct nvme_iod *iod = blk_mq_rq_to_pdu(rq);
int nseg = rq->nr_phys_segments;
unsigned size;
static struct nvme_iod *
__nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev,
unsigned long priv, gfp_t gfp)
{
struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) +
sizeof(__le64 *) * nvme_npages(bytes, dev) +
sizeof(struct scatterlist) * nseg, gfp);
if (rq->cmd_flags & REQ_DISCARD)
size = sizeof(struct nvme_dsm_range);
else
size = blk_rq_bytes(rq);
if (iod)
iod_init(iod, bytes, nseg, priv);
return iod;
}
static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev,
gfp_t gfp)
{
unsigned size = !(rq->cmd_flags & REQ_DISCARD) ? blk_rq_bytes(rq) :
sizeof(struct nvme_dsm_range);
struct nvme_iod *iod;
if (rq->nr_phys_segments <= NVME_INT_PAGES &&
size <= NVME_INT_BYTES(dev)) {
struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(rq);
iod = &cmd->__iod;
iod_init(iod, size, rq->nr_phys_segments,
(unsigned long) rq | NVME_INT_MASK);
return iod;
if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) {
iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC);
if (!iod->sg)
return BLK_MQ_RQ_QUEUE_BUSY;
} else {
iod->sg = iod->inline_sg;
}
return __nvme_alloc_iod(rq->nr_phys_segments, size, dev,
(unsigned long) rq, gfp);
iod->aborted = 0;
iod->npages = -1;
iod->nents = 0;
iod->length = size;
return 0;
}
static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
static void nvme_free_iod(struct nvme_dev *dev, struct request *req)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
const int last_prp = dev->ctrl.page_size / 8 - 1;
int i;
__le64 **list = iod_list(iod);
__le64 **list = iod_list(req);
dma_addr_t prp_dma = iod->first_dma;
if (iod->npages == 0)
@ -418,8 +383,8 @@ static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
prp_dma = next_prp_dma;
}
if (iod_should_kfree(iod))
kfree(iod);
if (iod->sg != iod->inline_sg)
kfree(iod->sg);
}
#ifdef CONFIG_BLK_DEV_INTEGRITY
@ -489,9 +454,10 @@ static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi)
}
#endif
static bool nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod,
static bool nvme_setup_prps(struct nvme_dev *dev, struct request *req,
int total_len)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct dma_pool *pool;
int length = total_len;
struct scatterlist *sg = iod->sg;
@ -500,7 +466,7 @@ static bool nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod,
u32 page_size = dev->ctrl.page_size;
int offset = dma_addr & (page_size - 1);
__le64 *prp_list;
__le64 **list = iod_list(iod);
__le64 **list = iod_list(req);
dma_addr_t prp_dma;
int nprps, i;
@ -568,10 +534,10 @@ static bool nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod,
return true;
}
static int nvme_map_data(struct nvme_dev *dev, struct nvme_iod *iod,
static int nvme_map_data(struct nvme_dev *dev, struct request *req,
struct nvme_command *cmnd)
{
struct request *req = iod_get_private(iod);
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct request_queue *q = req->q;
enum dma_data_direction dma_dir = rq_data_dir(req) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE;
@ -586,7 +552,7 @@ static int nvme_map_data(struct nvme_dev *dev, struct nvme_iod *iod,
if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir))
goto out;
if (!nvme_setup_prps(dev, iod, blk_rq_bytes(req)))
if (!nvme_setup_prps(dev, req, blk_rq_bytes(req)))
goto out_unmap;
ret = BLK_MQ_RQ_QUEUE_ERROR;
@ -617,9 +583,9 @@ out:
return ret;
}
static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod)
static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
{
struct request *req = iod_get_private(iod);
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
enum dma_data_direction dma_dir = rq_data_dir(req) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE;
@ -632,7 +598,7 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod)
}
}
nvme_free_iod(dev, iod);
nvme_free_iod(dev, req);
}
/*
@ -641,16 +607,16 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod)
* the iod.
*/
static int nvme_setup_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
struct nvme_iod *iod, struct nvme_command *cmnd)
struct request *req, struct nvme_command *cmnd)
{
struct request *req = iod_get_private(iod);
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct nvme_dsm_range *range;
range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC,
&iod->first_dma);
if (!range)
return BLK_MQ_RQ_QUEUE_BUSY;
iod_list(iod)[0] = (__le64 *)range;
iod_list(req)[0] = (__le64 *)range;
iod->npages = 0;
range->cattr = cpu_to_le32(0);
@ -676,8 +642,6 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
struct nvme_queue *nvmeq = hctx->driver_data;
struct nvme_dev *dev = nvmeq->dev;
struct request *req = bd->rq;
struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
struct nvme_iod *iod;
struct nvme_command cmnd;
int ret = BLK_MQ_RQ_QUEUE_OK;
@ -694,12 +658,12 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
}
}
iod = nvme_alloc_iod(req, dev, GFP_ATOMIC);
if (!iod)
return BLK_MQ_RQ_QUEUE_BUSY;
ret = nvme_init_iod(req, dev);
if (ret)
return ret;
if (req->cmd_flags & REQ_DISCARD) {
ret = nvme_setup_discard(nvmeq, ns, iod, &cmnd);
ret = nvme_setup_discard(nvmeq, ns, req, &cmnd);
} else {
if (req->cmd_type == REQ_TYPE_DRV_PRIV)
memcpy(&cmnd, req->cmd, sizeof(cmnd));
@ -709,14 +673,12 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
nvme_setup_rw(ns, req, &cmnd);
if (req->nr_phys_segments)
ret = nvme_map_data(dev, iod, &cmnd);
ret = nvme_map_data(dev, req, &cmnd);
}
if (ret)
goto out;
cmd->iod = iod;
cmd->aborted = 0;
cmnd.common.command_id = req->tag;
blk_mq_start_request(req);
@ -726,17 +688,17 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
spin_unlock_irq(&nvmeq->q_lock);
return BLK_MQ_RQ_QUEUE_OK;
out:
nvme_free_iod(dev, iod);
nvme_free_iod(dev, req);
return ret;
}
static void nvme_complete_rq(struct request *req)
{
struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
struct nvme_dev *dev = cmd->nvmeq->dev;
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct nvme_dev *dev = iod->nvmeq->dev;
int error = 0;
nvme_unmap_data(dev, cmd->iod);
nvme_unmap_data(dev, req);
if (unlikely(req->errors)) {
if (nvme_req_needs_retry(req, req->errors)) {
@ -750,7 +712,7 @@ static void nvme_complete_rq(struct request *req)
error = nvme_error_status(req->errors);
}
if (unlikely(cmd->aborted)) {
if (unlikely(iod->aborted)) {
dev_warn(dev->dev,
"completing aborted command with status: %04x\n",
req->errors);
@ -955,8 +917,8 @@ static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid)
static void abort_endio(struct request *req, int error)
{
struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
struct nvme_queue *nvmeq = cmd->nvmeq;
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct nvme_queue *nvmeq = iod->nvmeq;
u32 result = (u32)(uintptr_t)req->special;
u16 status = req->errors;
@ -968,8 +930,8 @@ static void abort_endio(struct request *req, int error)
static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
{
struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req);
struct nvme_queue *nvmeq = cmd_rq->nvmeq;
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct nvme_queue *nvmeq = iod->nvmeq;
struct nvme_dev *dev = nvmeq->dev;
struct request *abort_req;
struct nvme_command cmd;
@ -994,7 +956,7 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
* command was already aborted once before and still hasn't been
* returned to the driver, or if this is the admin queue.
*/
if (!nvmeq->qid || cmd_rq->aborted) {
if (!nvmeq->qid || iod->aborted) {
dev_warn(dev->dev,
"I/O %d QID %d timeout, reset controller\n",
req->tag, nvmeq->qid);
@ -1009,7 +971,7 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
return BLK_EH_HANDLED;
}
cmd_rq->aborted = 1;
iod->aborted = 1;
if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) {
atomic_inc(&dev->ctrl.abort_limit);