linux-kernel - Re: [PATCH v3 11/25] cxl/mem: Expose DCD partition capabilities in sysfs

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Message-ID: <66c7f3d977851_1719d29424@iweiny-mobl.notmuch>
Date: Thu, 22 Aug 2024 21:28:41 -0500
From: Ira Weiny <ira.weiny@...el.com>
To: Dave Jiang <dave.jiang@...el.com>, <ira.weiny@...el.com>, Fan Ni
	<fan.ni@...sung.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>, Navneet
 Singh <navneet.singh@...el.com>, Chris Mason <clm@...com>, "Josef Bacik"
	<josef@...icpanda.com>, David Sterba <dsterba@...e.com>, Petr Mladek
	<pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, Andy Shevchenko
	<andriy.shevchenko@...ux.intel.com>, Rasmus Villemoes
	<linux@...musvillemoes.dk>, Sergey Senozhatsky <senozhatsky@...omium.org>,
	Jonathan Corbet <corbet@....net>, Andrew Morton <akpm@...ux-foundation.org>
CC: Dan Williams <dan.j.williams@...el.com>, Davidlohr Bueso
	<dave@...olabs.net>, Alison Schofield <alison.schofield@...el.com>, "Vishal
 Verma" <vishal.l.verma@...el.com>, <linux-btrfs@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <nvdimm@...ts.linux.dev>
Subject: Re: [PATCH v3 11/25] cxl/mem: Expose DCD partition capabilities in
 sysfs

Dave Jiang wrote:
> 
> 
> On 8/16/24 7:44 AM, ira.weiny@...el.com wrote:
> > From: Navneet Singh <navneet.singh@...el.com>
> > 
> > To properly configure CXL regions on Dynamic Capacity Devices (DCD),
> > user space will need to know the details of the DC partitions available.
> > 
> > Expose dynamic capacity capabilities through sysfs.
> > 
> > Signed-off-by: Navneet Singh <navneet.singh@...el.com>
> > Co-developed-by: Ira Weiny <ira.weiny@...el.com>
> > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> > 
> > ---
> > Changes:
> > [iweiny: remove review tags]
> > [Davidlohr/Fan/Jonathan: omit 'dc' attribute directory if device is not DC]
> > [Jonathan: update documentation for dc visibility]
> > [Jonathan: Add a comment to DC region X attributes to ensure visibility checks work]
> > [iweiny: push sysfs version to 6.12]
> > ---
> >  Documentation/ABI/testing/sysfs-bus-cxl | 12 ++++
> >  drivers/cxl/core/memdev.c               | 97 +++++++++++++++++++++++++++++++++
> >  2 files changed, 109 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl
> > index 957717264709..6227ae0ab3fc 100644
> > --- a/Documentation/ABI/testing/sysfs-bus-cxl
> > +++ b/Documentation/ABI/testing/sysfs-bus-cxl
> > @@ -54,6 +54,18 @@ Description:
> >  		identically named field in the Identify Memory Device Output
> >  		Payload in the CXL-2.0 specification.
> >  
> > +What:		/sys/bus/cxl/devices/memX/dc/region_count
> > +		/sys/bus/cxl/devices/memX/dc/regionY_size
> 
> Just make it into 2 separate entries?

Do you mean in the docs?

Ira

> 
> DJ
> > +Date:		August, 2024
> > +KernelVersion:	v6.12
> > +Contact:	linux-cxl@...r.kernel.org
> > +Description:
> > +		(RO) Dynamic Capacity (DC) region information.  The dc
> > +		directory is only visible on devices which support Dynamic
> > +		Capacity.
> > +		The region_count is the number of Dynamic Capacity (DC)
> > +		partitions (regions) supported on the device.
> > +		regionY_size is the size of each of those partitions.
> >  
> >  What:		/sys/bus/cxl/devices/memX/pmem/qos_class
> >  Date:		May, 2023

[snip]