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nvme: implement support for relaxed effects 

NVM Express TP4167 provides a way for controllers to report a relaxed
execution constraint. Specifically, it notifies of exclusivity for IO
vs. admin commands instead of grouping these together. If set, then we
don't need to freeze IO in order to execute that admin command. The
freezing distrupts IO processes, so it's nice to avoid that if the
controller tells us it's not necessary.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Keith Busch 2024-02-05 11:10:25 -08:00
parent 79bd7eab83
commit 29f6975332
2 changed files with 5 additions and 0 deletions
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4
drivers/nvme/host/core.c
View File

@ -1153,6 +1153,10 @@ u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode)
effects &= ~NVME_CMD_EFFECTS_CSE_MASK;
} else {
effects = le32_to_cpu(ctrl->effects->acs[opcode]);
/* Ignore execution restrictions if any relaxation bits are set */
if (effects & NVME_CMD_EFFECTS_CSER_MASK)
effects &= ~NVME_CMD_EFFECTS_CSE_MASK;
}
return effects;

1
include/linux/nvme.h
View File

@ -646,6 +646,7 @@ enum {
NVME_CMD_EFFECTS_NCC = 1 << 2,
NVME_CMD_EFFECTS_NIC = 1 << 3,
NVME_CMD_EFFECTS_CCC = 1 << 4,
NVME_CMD_EFFECTS_CSER_MASK = GENMASK(15, 14),
NVME_CMD_EFFECTS_CSE_MASK = GENMASK(18, 16),
NVME_CMD_EFFECTS_UUID_SEL = 1 << 19,
NVME_CMD_EFFECTS_SCOPE_MASK = GENMASK(31, 20),