Re: [PATCH v6 9/9] Documentation/ABI: Document CXL memdev cxl_reset

[Dave Jiang]

On 5/28/26 1:31 AM, Srirangan Madhavan wrote:
> Document the write-only cxl_reset attribute under CXL memdev devices.
> The attribute is visible only when the memdev's PCI parent advertises
> CXL Reset capability, and writing a true boolean value requests the CXL
> reset flow.
> 
> Signed-off-by: Srirangan Madhavan <smadhavan@xxxxxxxxxx>
> ---
>  Documentation/ABI/testing/sysfs-bus-cxl | 28 +++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl
> index 16a9b3d2e2c0..d5d055e7a756 100644
> --- a/Documentation/ABI/testing/sysfs-bus-cxl
> +++ b/Documentation/ABI/testing/sysfs-bus-cxl
> @@ -110,6 +110,34 @@ Description:
>  		affinity for this device.
>  
>  
> +What:		/sys/bus/cxl/devices/memX/cxl_reset
> +Date:		May, 2026
> +KernelVersion:	v7.1
> +Contact:	linux-cxl@xxxxxxxxxxxxxxx
> +Description:
> +		(WO) Write a boolean true value, for example "1" or "true", to
> +		request CXL Reset for this memory device. The driver performs
> +		CXL-specific reset coordination for the target memdev before
> +		issuing reset, including any required preparation for affected
> +		CXL memory regions and related CXL memory devices.
> +
> +		CXL Reset control is Function 0 scoped. A write to this
> +		attribute resets the CXL.cache and CXL.mem state for all
> +		CXL.cache or CXL.mem functions in the same CXL device reset
> +		scope, not only the memX device associated with this file.
> +
> +		The optional CXL Reset Memory Clear operation is not exposed by
> +		this attribute.
> +
> +		A reset fails with -EBUSY if any affected CXL region is
> +		online as System RAM or has an active region driver bound.
> +		Userspace must first quiesce and release affected CXL memory
> +		mappings.
> +
> +		If this file is not present, then CXL Reset is not supported
> +		for the device.

Need to mention this is only shows up for type2 devices. Also missing information about decoder and dvsec range restore.


> +
> +
>  What:		/sys/bus/cxl/devices/memX/security/state
>  Date:		June, 2023
>  KernelVersion:	v6.5