From: Keith Busch Date: Mon, 5 Feb 2024 19:10:25 +0000 (-0800) Subject: nvme: implement support for relaxed effects X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=29f6975332479f92233594901c649ff4d71f8cb6;p=linux.git 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 Signed-off-by: Keith Busch --- diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 60537c9224bf9..0a96362912ced 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -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; diff --git a/include/linux/nvme.h b/include/linux/nvme.h index bc605ec4a3fd0..3ef4053ea9500 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -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),