linux-kernel - RE: [RFC PATCH v7 00/12] memory: scrub: introduce subsystem + CXL/ACPI-RAS2 drivers

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Date: Wed, 3 Apr 2024 13:52:02 +0000
From: Shiju Jose <shiju.jose@...wei.com>
To: Daniel Ferguson <danielf@...amperecomputing.com>,
	"linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
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	<dan.j.williams@...el.com>, "dave@...olabs.net" <dave@...olabs.net>,
	"Jonathan Cameron" <jonathan.cameron@...wei.com>, "dave.jiang@...el.com"
	<dave.jiang@...el.com>, "alison.schofield@...el.com"
	<alison.schofield@...el.com>, "vishal.l.verma@...el.com"
	<vishal.l.verma@...el.com>, "ira.weiny@...el.com" <ira.weiny@...el.com>
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Subject: RE: [RFC PATCH v7 00/12] memory: scrub: introduce subsystem +
 CXL/ACPI-RAS2 drivers

Hi Daniel,

Thanks for the feedbacks.

>-----Original Message-----
>From: Daniel Ferguson <danielf@...amperecomputing.com>
>Sent: 28 March 2024 23:40
>To: Shiju Jose <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 <jonathan.cameron@...wei.com>;
>dave.jiang@...el.com; alison.schofield@...el.com; vishal.l.verma@...el.com;
>ira.weiny@...el.com
>Cc: linux-edac@...r.kernel.org; linux-kernel@...r.kernel.org;
>david@...hat.com; Vilas.Sridharan@....com; leo.duran@....com;
>Yazen.Ghannam@....com; rientjes@...gle.com; jiaqiyan@...gle.com;
>tony.luck@...el.com; Jon.Grimm@....com; dave.hansen@...ux.intel.com;
>rafael@...nel.org; lenb@...nel.org; naoya.horiguchi@....com;
>james.morse@....com; jthoughton@...gle.com; somasundaram.a@....com;
>erdemaktas@...gle.com; pgonda@...gle.com; duenwen@...gle.com;
>mike.malvestuto@...el.com; gthelen@...gle.com;
>wschwartz@...erecomputing.com; dferguson@...erecomputing.com;
>tanxiaofei <tanxiaofei@...wei.com>; Zengtao (B) <prime.zeng@...ilicon.com>;
>kangkang.shen@...urewei.com; wanghuiqiang <wanghuiqiang@...wei.com>;
>Linuxarm <linuxarm@...wei.com>; wbs@...amperecomputing.com
>Subject: Re: [RFC PATCH v7 00/12] memory: scrub: introduce subsystem +
>CXL/ACPI-RAS2 drivers
>
>> RAS2 HW based memory patrol scrub needs RAS2 PCC interfaces and ACPI
>> RAS2 driver for communication b/w kernel and firmware.
>> ACPI RAS2 Driver adds platform device, for each memory feature, which
>> binds to the RAS2 memory driver.
>> Memory RAS2 driver registers with the memory scrub subsystem to expose
>> the RAS2 scrub controls to the user.
>
>Hi Shiju,
>Thanks for this work. This has been very useful for us, as we've been using it to
>test a RAS2 implementation here at Ampere Computing.
>
>In general, the pieces implementing RAS2 are useful and functional. We did,
>however, encounter a few places where we had to make some bug fixes.
>I'll reply to specific patches with changes I can recommend. Also, there are a
>few implementation choices that I will have questions about.
>
>Here is an outline containing the generalized comments I plan on making
>within/near relevant patches:
>1) Found a bug in ras2.c in how the pcc_desc_list pointer is incremented.
This bug was fixed in the local v8 code.

>2) Executing a RAS2 command seems unnecessary for feature detection.
>specifically, in the functions ras2_is_patrol_scrub_support() and
>ras2_get_patrol_scrub_params()
I will check and modify in the next version.

>3) Consider adding more error detection/reporting in ras2_check_pcc_chan()
Sure.

>4) Concerns with multiple scrub devices attempting to map the same PCC
>channel.
I will reply in the patch. 
>
>-Daniel
>
Thanks,
Shiju