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nvme-pci: Add support for variable IO SQ element size

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The size of a submission queue element should always be 6 (64 bytes)
by spec.

However some controllers such as Apple's are not properly implementing
the standard and require a different size.

This provides the ground work for the subsequent quirks for these
controllers.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Benjamin Herrenschmidt 2019-08-07 17:51:20 +10:00 • committed by Sagi Grimberg
parent 8a1d09a668
commit c1e0cc7e1d
2 changed files with 9 additions and 3 deletions
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1
include/linux/nvme.h
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@ -140,6 +140,7 @@ enum {
* Submission and Completion Queue Entry Sizes for the NVM command set.
* (In bytes and specified as a power of two (2^n)).
*/
#define NVME_ADM_SQES 6
#define NVME_NVM_IOSQES 6
#define NVME_NVM_IOCQES 4