diff options
author | Christoph Hellwig <hch@lst.de> | 2017-02-08 14:46:50 +0100 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2017-02-08 13:43:10 -0700 |
commit | b35ba01ea6979125e9c23fb322517748278f15e6 (patch) | |
tree | 41ad3c16c12d34660e135b6ffd6be7424d3ba305 /drivers/nvme | |
parent | 1e739730c5b9ea80a2f25e9cf6e1025d47e3d8ed (diff) | |
download | linux-b35ba01ea6979125e9c23fb322517748278f15e6.tar.bz2 |
nvme: support ranged discard requests
NVMe supports up to 256 ranges per DSM command, so wire up support
for ranged discards up to that limit.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme')
-rw-r--r-- | drivers/nvme/host/core.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 1640a5c8abbb..2701c21d1719 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -238,26 +238,38 @@ static inline void nvme_setup_flush(struct nvme_ns *ns, static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req, struct nvme_command *cmnd) { + unsigned short segments = blk_rq_nr_discard_segments(req), n = 0; struct nvme_dsm_range *range; - unsigned int nr_bytes = blk_rq_bytes(req); + struct bio *bio; - range = kmalloc(sizeof(*range), GFP_ATOMIC); + range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC); if (!range) return BLK_MQ_RQ_QUEUE_BUSY; - range->cattr = cpu_to_le32(0); - range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift); - range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); + __rq_for_each_bio(bio, req) { + u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector); + u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift; + + range[n].cattr = cpu_to_le32(0); + range[n].nlb = cpu_to_le32(nlb); + range[n].slba = cpu_to_le64(slba); + n++; + } + + if (WARN_ON_ONCE(n != segments)) { + kfree(range); + return BLK_MQ_RQ_QUEUE_ERROR; + } memset(cmnd, 0, sizeof(*cmnd)); cmnd->dsm.opcode = nvme_cmd_dsm; cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); - cmnd->dsm.nr = 0; + cmnd->dsm.nr = segments - 1; cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); req->special_vec.bv_page = virt_to_page(range); req->special_vec.bv_offset = offset_in_page(range); - req->special_vec.bv_len = sizeof(*range); + req->special_vec.bv_len = sizeof(*range) * segments; req->rq_flags |= RQF_SPECIAL_PAYLOAD; return BLK_MQ_RQ_QUEUE_OK; @@ -871,6 +883,9 @@ static void nvme_config_discard(struct nvme_ns *ns) struct nvme_ctrl *ctrl = ns->ctrl; u32 logical_block_size = queue_logical_block_size(ns->queue); + BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) < + NVME_DSM_MAX_RANGES); + if (ctrl->quirks & NVME_QUIRK_DISCARD_ZEROES) ns->queue->limits.discard_zeroes_data = 1; else @@ -879,6 +894,7 @@ static void nvme_config_discard(struct nvme_ns *ns) ns->queue->limits.discard_alignment = logical_block_size; ns->queue->limits.discard_granularity = logical_block_size; blk_queue_max_discard_sectors(ns->queue, UINT_MAX); + blk_queue_max_discard_segments(ns->queue, NVME_DSM_MAX_RANGES); queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); } |