diff options
| author | Keith Busch <keith.busch@intel.com> | 2013-04-10 01:13:20 +0200 |
|---|---|---|
| committer | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2013-05-02 20:41:05 +0200 |
| commit | 159b67d7aefe3902df91075be5d80943c1570aa8 (patch) | |
| tree | 8c830202c7bc95727ecfc4e6dace6a5d8f4a1ea8 /drivers | |
| parent | NVMe: Split non-mergeable bio requests (diff) | |
| download | linux-159b67d7aefe3902df91075be5d80943c1570aa8.tar.xz linux-159b67d7aefe3902df91075be5d80943c1570aa8.zip | |
NVMe: Device specific stripe size handling
We have an nvme device that has a concept of a stripe size. IO requests
that do not transfer data crossing a stripe boundary has greater
performance compared to IO that does cross it. This patch sets the
stripe size for the device if the device and vendor ids match one with
this feature and splits IO requests that cross the stripe boundary.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/nvme-core.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index f81280663a4b..4151a3d26e2d 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -519,7 +519,11 @@ static int nvme_map_bio(struct nvme_queue *nvmeq, struct nvme_iod *iod, { struct bio_vec *bvec, *bvprv = NULL; struct scatterlist *sg = NULL; - int i, length = 0, nsegs = 0; + int i, length = 0, nsegs = 0, split_len = bio->bi_size; + + if (nvmeq->dev->stripe_size) + split_len = nvmeq->dev->stripe_size - + ((bio->bi_sector << 9) & (nvmeq->dev->stripe_size - 1)); sg_init_table(iod->sg, psegs); bio_for_each_segment(bvec, bio, i) { @@ -535,6 +539,10 @@ static int nvme_map_bio(struct nvme_queue *nvmeq, struct nvme_iod *iod, bvec->bv_offset); nsegs++; } + + if (split_len - length < bvec->bv_len) + return nvme_split_and_submit(bio, nvmeq, i, split_len, + split_len - length); length += bvec->bv_len; bvprv = bvec; } @@ -543,6 +551,7 @@ static int nvme_map_bio(struct nvme_queue *nvmeq, struct nvme_iod *iod, if (dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents, dma_dir) == 0) return -ENOMEM; + BUG_ON(length != bio->bi_size); return length; } @@ -1612,6 +1621,7 @@ static int nvme_dev_add(struct nvme_dev *dev) struct nvme_id_ns *id_ns; void *mem; dma_addr_t dma_addr; + int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12; res = nvme_setup_io_queues(dev); if (res) @@ -1634,10 +1644,11 @@ static int nvme_dev_add(struct nvme_dev *dev) 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)); - if (ctrl->mdts) { - int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12; + if (ctrl->mdts) dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9); - } + if ((dev->pci_dev->vendor == PCI_VENDOR_ID_INTEL) && + (dev->pci_dev->device == 0x0953) && ctrl->vs[3]) + dev->stripe_size = 1 << (ctrl->vs[3] + shift); id_ns = mem; for (i = 1; i <= nn; i++) { |