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[RFC,6/6] cxl: scrub: sysfs: Add Documentation for CXL memory device scrub control attributes

Message ID 20231114125648.1146-7-shiju.jose@huawei.com
State Superseded
Headers show
Series cxl: Add support for CXL feature commands, CXL device patrol scrub control and DDR5 ECS control features | expand

Commit Message

Shiju Jose Nov. 14, 2023, 12:56 p.m. UTC 
From: Shiju Jose <shiju.jose@huawei.com>

Add sysfs documentation entries for the CXL memory device scrub
control attributes those are exposed in /sys/class/scrub/ by the
scrub driver. These attributes support configuring a CXL memory
device scrub.

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
---
 .../testing/sysfs-class-cxl-scrub-configure   | 135 ++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-class-cxl-scrub-configure
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Patch

diff --git a/Documentation/ABI/testing/sysfs-class-cxl-scrub-configure b/Documentation/ABI/testing/sysfs-class-cxl-scrub-configure
new file mode 100644
index 000000000000..9dd0c18451aa
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-cxl-scrub-configure
@@ -0,0 +1,135 @@ 
+What:		/sys/class/scrub/
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		The scrub/ class subdirectory belongs to the scrub
+		subsystem.
+
+What:		/sys/class/scrub/scrubX/
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		The /sys/class/scrub/scrub{0,1,2,3,...} directories
+		correspond to each scrub device.
+
+What:		/sys/class/scrub/scrubX/name
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RO) name of the memory scrub device
+
+What:		/sys/class/scrub/scrubX/regionY/
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		The /sys/class/scrub/scrubX/region{0,1,2,3,...}
+		directories correspond to each scrub region under a scrub device.
+		Scrub region is a physical address range or for example
+		memory media FRU of DDR5 ECS feature for which scrub may be
+		separately controlled.
+
+What:		/sys/class/scrub/scrubX/regionY/enable
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(WO) Start/Stop CXL memory patrol scrub.
+		1 - enable the CXL memory patrol scrub.
+		0 - disable the CXL memory patrol scrub.
+
+What:		/sys/class/scrub/scrubX/regionY/speed
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RW) The scrub cycle to set for the CXL memory
+		patrol scrub and it must be within the supported
+		range. The unit of the scrub cycle is hour.
+
+What:		/sys/class/scrub/scrubX/regionY/speed_available
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RO) Supported range of the scrub cycle by the
+		CXL memory patrol scrub.
+		The unit of the scrub cycle is hour.
+
+What:		/sys/class/scrub/scrubX/regionY/ecs_log_entry_type
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RW) The log entry type of how the DDR5 ECS log is
+		reported.
+		00b - per DRAM.
+		01b - per memory media FRU.
+
+What:		/sys/class/scrub/scrubX/regionY/ecs_log_entry_type_per_dram
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RO) Returns true if current log entry type of DDR5 ECS
+		region is per DRAM.
+
+What:		/sys/class/scrub/scrubX/regionY/ecs_log_entry_type_per_memory_media
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RO) Returns true if current log entry type of DDR5 ECS
+		region is per memory media FRU.
+
+What:		/sys/class/scrub/scrubX/regionY/mode
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RW) The mode of how the DDR5 ECS counts the errors.
+		0 - ECS counts rows with errors.
+		1 - ECS counts codewords with errors.
+
+What:		/sys/class/scrub/scrubX/regionY/mode_counts_rows
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RO) Returns true if current mode of DDR5 ECS region
+		is counts rows with errors.
+
+What:		/sys/class/scrub/scrubX/regionY/mode_counts_codewords
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RO) Returns true if current mode of DDR5 ECS region
+		is counts codewords with errors.
+
+What:		/sys/class/scrub/scrubX/regionY/reset_counter
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(WO) DDR5 ECS reset ECC counter.
+		0 - normal, ECC counter running actively.
+		1 - reset ECC counter to the default value.
+
+What:		/sys/class/scrub/scrubX/regionY/threshold
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RW) DDR5 ECS threshold count per GB of memory cells.
+
+What:		/sys/class/scrub/scrubX/regionY/threshold_available
+Date:		November 2023
+KernelVersion:	6.8
+Contact:	linux-kernel@vger.kernel.org
+Description:
+		(RO) Supported list of DDR5 ECS threshold count per GB of
+		memory cells.