[PATCH AUTOSEL 6.6 30/47] nvme: introduce helper function to get ctrl state

Sasha Levin
2023-12-11T13:57:05Z

From: Keith Busch <kbusch@kernel.org>

[ Upstream commit 5c687c287c46fadb14644091823298875a5216aa ]

The controller state is typically written by another CPU, so reading it
should ensure no optimizations are taken. This is a repeated pattern in
the driver, so start with adding a convenience function that returns the
controller state with READ_ONCE().

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/host/nvme.h | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index f35647c470afa..68313148e6ed5 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -386,6 +386,11 @@ struct nvme_ctrl {
enum nvme_dctype dctype;
};

+static inline enum nvme_ctrl_state nvme_ctrl_state(struct nvme_ctrl *ctrl)
+{
+ return READ_ONCE(ctrl->state);
+}
+
enum nvme_iopolicy {
NVME_IOPOLICY_NUMA,
NVME_IOPOLICY_RR,
--
2.42.0