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nvme: implement NS Optimal IO Boundary from 1.3 Spec

Browse source 
The NVMe 1.3 spec introduces Namespace Optimal IO Boundaries (NOIOB),
which standardizes the stripe mechanism we currently have quirks for.
This patch implements the necessary logic to handle this new feature.

Signed-off-by: Scott Bauer <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Scott Bauer 2017-06-15 10:44:30 -06:00 • committed by Christoph Hellwig
commit 6b8190d61a
3 changed files with 11 additions and 1 deletions
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9
drivers/nvme/host/core.c
View file

@ -1080,6 +1080,12 @@ static void nvme_init_integrity(struct nvme_ns *ns)
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */
static void nvme_set_chunk_size(struct nvme_ns *ns)
{
u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
}
static void nvme_config_discard(struct nvme_ns *ns)
{
struct nvme_ctrl *ctrl = ns->ctrl;
@ -1139,12 +1145,15 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
if (ns->lba_shift == 0)
ns->lba_shift = 9;
bs = 1 << ns->lba_shift;
ns->noiob = le16_to_cpu(id->noiob);
blk_mq_freeze_queue(disk->queue);
if (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)
nvme_prep_integrity(disk, id, bs);
blk_queue_logical_block_size(ns->queue, bs);
if (ns->noiob)
nvme_set_chunk_size(ns);
if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
nvme_init_integrity(ns);
if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))

1
drivers/nvme/host/nvme.h
View file

@ -202,6 +202,7 @@ struct nvme_ns {
bool ext;
u8 pi_type;
unsigned long flags;
u16 noiob;
#define NVME_NS_REMOVING 0
#define NVME_NS_DEAD 1