linux-kernel - Re: [PATCH 3/3] cxl/core: Add sysfs attribute get

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Message-ID: <20220618002121.GA1533961@alison-desk>
Date:   Fri, 17 Jun 2022 17:21:21 -0700
From:   Alison Schofield <alison.schofield@...el.com>
To:     "Williams, Dan J" <dan.j.williams@...el.com>
Cc:     "Weiny, Ira" <ira.weiny@...el.com>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] cxl/core: Add sysfs attribute get_poison for list
 retrieval

On Fri, Jun 17, 2022 at 11:42:11AM -0700, Dan Williams wrote:
> alison.schofield@ wrote:
> > From: Alison Schofield <alison.schofield@...el.com>
> > 
> > The sysfs attribute, get_poison, allows user space to request the
> > retrieval of a CXL devices poison list for its persistent memory.
> 
> If the device supports get poison list for volatile memory, just grab
> that too. With the "to be released soon" region patches userspace can
> trivially translate DPA addresses to media type.
> 

Dan,

The only way I know to discover if the device supports poison list for
volatile is to do the get_poison_list on the volatile range and see
what happens. Am I missing a capability setting somewhere?

Here's a blanket "Got it, Thanks!" for all the other pieces.

Alison


> > 
snip