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nvme: rewrite discard support 

This rewrites nvme_setup_discard() with blk_add_request_payload().
It allocates only the necessary amount(16 bytes) for the payload.

Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lin 2016-03-22 00:24:45 -07:00 committed by Jens Axboe
parent 58b4560275
commit 03b5929ebb
1 changed files with 39 additions and 29 deletions
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68
drivers/nvme/host/pci.c
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@ -363,6 +363,9 @@ static void nvme_free_iod(struct nvme_dev *dev, struct request *req)
__le64 **list = iod_list(req);
dma_addr_t prp_dma = iod->first_dma;
if (req->cmd_flags & REQ_DISCARD)
kfree(req->completion_data);
if (iod->npages == 0)
dma_pool_free(dev->prp_small_pool, list[0], prp_dma);
for (i = 0; i < iod->npages; i++) {
@ -524,7 +527,7 @@ static bool nvme_setup_prps(struct nvme_dev *dev, struct request *req,
}
static int nvme_map_data(struct nvme_dev *dev, struct request *req,
struct nvme_command *cmnd)
unsigned size, struct nvme_command *cmnd)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct request_queue *q = req->q;
@ -541,7 +544,7 @@ static int nvme_map_data(struct nvme_dev *dev, struct request *req,
if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir))
goto out;
if (!nvme_setup_prps(dev, req, blk_rq_bytes(req)))
if (!nvme_setup_prps(dev, req, size))
goto out_unmap;
ret = BLK_MQ_RQ_QUEUE_ERROR;
@ -590,35 +593,41 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
nvme_free_iod(dev, req);
}
/*
* We reuse the small pool to allocate the 16-byte range here as it is not
* worth having a special pool for these or additional cases to handle freeing
* the iod.
*/
static int nvme_setup_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
struct request *req, struct nvme_command *cmnd)
static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmnd)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
struct nvme_dsm_range *range;
struct page *page;
int offset;
unsigned int nr_bytes = blk_rq_bytes(req);
range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC,
&iod->first_dma);
range = kmalloc(sizeof(*range), GFP_ATOMIC);
if (!range)
return BLK_MQ_RQ_QUEUE_BUSY;
iod_list(req)[0] = (__le64 *)range;
iod->npages = 0;
range->cattr = cpu_to_le32(0);
range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift);
range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift);
range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
memset(cmnd, 0, sizeof(*cmnd));
cmnd->dsm.opcode = nvme_cmd_dsm;
cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma);
cmnd->dsm.nr = 0;
cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
return BLK_MQ_RQ_QUEUE_OK;
req->completion_data = range;
page = virt_to_page(range);
offset = offset_in_page(range);
blk_add_request_payload(req, page, offset, sizeof(*range));
/*
* we set __data_len back to the size of the area to be discarded
* on disk. This allows us to report completion on the full amount
* of blocks described by the request.
*/
req->__data_len = nr_bytes;
return 0;
}
/*
@ -653,19 +662,20 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
if (ret)
return ret;
if (req->cmd_flags & REQ_DISCARD) {
ret = nvme_setup_discard(nvmeq, ns, req, &cmnd);
} else {
if (req->cmd_type == REQ_TYPE_DRV_PRIV)
memcpy(&cmnd, req->cmd, sizeof(cmnd));
else if (req->cmd_flags & REQ_FLUSH)
nvme_setup_flush(ns, &cmnd);
else
nvme_setup_rw(ns, req, &cmnd);
if (req->cmd_type == REQ_TYPE_DRV_PRIV)
memcpy(&cmnd, req->cmd, sizeof(cmnd));
else if (req->cmd_flags & REQ_FLUSH)
nvme_setup_flush(ns, &cmnd);
else if (req->cmd_flags & REQ_DISCARD)
ret = nvme_setup_discard(ns, req, &cmnd);
else
nvme_setup_rw(ns, req, &cmnd);
if (req->nr_phys_segments)
ret = nvme_map_data(dev, req, &cmnd);
}
if (ret)
goto out;
if (req->nr_phys_segments)
ret = nvme_map_data(dev, req, map_len, &cmnd);
if (ret)
goto out;