linux-kernel - Re: [PATCH v3 07/25] cxl/core: Separate region mode from decoder mode

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Message-ID: <20240823164723.00003560@Huawei.com>
Date: Fri, 23 Aug 2024 16:47:23 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: <ira.weiny@...el.com>
CC: Dave Jiang <dave.jiang@...el.com>, Fan Ni <fan.ni@...sung.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>,
	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 07/25] cxl/core: Separate region mode from decoder
 mode

On Fri, 16 Aug 2024 09:44:15 -0500
ira.weiny@...el.com wrote:

> From: Navneet Singh <navneet.singh@...el.com>
> 
> Until now region modes and decoder modes were equivalent in that both
> modes were either PMEM or RAM.  The addition of Dynamic
> Capacity partitions defines up to 8 DC partitions per device.
> 
> The region mode is thus no longer equivalent to the endpoint decoder
> mode.  IOW the endpoint decoders may have modes of DC0-DC7 while the
> region mode is simply DC.
> 
> Define a new region mode enumeration which applies to regions separate
> from the decoder mode.  Adjust the code to process these modes
> independently.
> 
> There is no equal to decoder mode dead in region modes.  Avoid
> constructing regions with decoders which have been flagged as dead.
> 
> Suggested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 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>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>