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nvme: allow for size limitations from transport drivers 

Some transport drivers may have a lower transfer size than
the controller. So allow the transport to set it in the
controller max_hw_sectors.

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2016-06-06 23:20:48 +02:00 committed by Jens Axboe
parent 3972be23bd
commit a229dbf61e
1 changed files with 5 additions and 2 deletions
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7
drivers/nvme/host/core.c
View File

@ -1105,6 +1105,7 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
struct nvme_id_ctrl *id;
u64 cap;
int ret, page_shift;
u32 max_hw_sectors;
ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
if (ret) {
@ -1137,9 +1138,11 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
memcpy(ctrl->model, id->mn, sizeof(id->mn));
memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
if (id->mdts)
ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9);
max_hw_sectors = 1 << (id->mdts + page_shift - 9);
else
ctrl->max_hw_sectors = UINT_MAX;
max_hw_sectors = UINT_MAX;
ctrl->max_hw_sectors =
min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
unsigned int max_hw_sectors;