linux-kernel - Re: [RFC PATCH v7 12/12] memory: RAS2: Add memory RAS2 driver

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Date: Thu, 28 Mar 2024 11:23:38 -0400
From: Yazen Ghannam <yazen.ghannam@....com>
To: shiju.jose@...wei.com, linux-cxl@...r.kernel.org,
 linux-acpi@...r.kernel.org, linux-mm@...ck.org, dan.j.williams@...el.com,
 dave@...olabs.net, jonathan.cameron@...wei.com, dave.jiang@...el.com,
 alison.schofield@...el.com, vishal.l.verma@...el.com, ira.weiny@...el.com
Cc: yazen.ghannam@....com, linux-edac@...r.kernel.org,
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Subject: Re: [RFC PATCH v7 12/12] memory: RAS2: Add memory RAS2 driver

On 2/23/2024 9:37 AM, shiju.jose@...wei.com wrote:
> From: Shiju Jose <shiju.jose@...wei.com>
> 
> Memory RAS2 driver binds to the platform device add by the ACPI RAS2
> driver.
> Driver registers the PCC channel for communicating with the ACPI compliant
> platform that contains RAS2 command support in the hardware.
> 
> Add interface functions to support configuring the parameters of HW patrol
> scrubs in the system, which exposed to the kernel via the RAS2 and PCC,
> using the RAS2 commands.
> 
> Add support for RAS2 platform devices to register with scrub subsystem
> driver. This enables user to configure the parameters of HW patrol scrubs,
> which exposed to the kernel via the RAS2 table, through the scrub sysfs
> attributes.
> 
> Open Question:
> Sysfs scrub control attribute "enable_background_scrub" is added for RAS2,
> based on the feedback from Bill Schwartz <wschwartz@...erecomputing.com
> on v4 to enable/disable the background_scrubbing in the platform as defined in the
> “Configure Scrub Parameters [INPUT]“ field  in RAS2 Table 5.87: Parameter Block
> Structure for PATROL_SCRUB.
> Is it a right approach to support "enable_background_scrub" in the sysfs
> scrub control?
> 
> Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
> ---
>  drivers/memory/Kconfig       |  14 ++
>  drivers/memory/Makefile      |   2 +
>  drivers/memory/ras2.c        | 364 +++++++++++++++++++++++++++++++++++
>  drivers/memory/ras2_common.c | 282 +++++++++++++++++++++++++++
>  include/memory/ras2.h        |  88 +++++++++
>  5 files changed, 750 insertions(+)
>  create mode 100644 drivers/memory/ras2.c
>  create mode 100644 drivers/memory/ras2_common.c
>  create mode 100755 include/memory/ras2.h
> 

Sorry if this was already covered, but why not put the common scrub and ras2
changes under /drivers/ras/?

Thanks,
Yazen