linux-kernel - Re: [PATCH v7] cxl/events: Use a common struct for DRAM and General Media events

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Date: Fri, 7 Jun 2024 16:13:21 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: "Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>
CC: avidlohr Bueso <dave@...olabs.net>, Dave Jiang <dave.jiang@...el.com>,
	Alison Schofield <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7] cxl/events: Use a common struct for DRAM and General
 Media events

On Fri,  7 Jun 2024 16:43:58 +0200
"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com> wrote:

> cxl_event_common was an unfortunate naming choice and caused confusion with
> the existing Common Event Record. Furthermore, its fields didn't map all
> the common information between DRAM and General Media Events.
> 
> Remove cxl_event_common and introduce cxl_event_media_hdr to record common
> information between DRAM and General Media events.
> 
> cxl_event_media_hdr, which is embedded in both cxl_event_gen_media and
> cxl_event_dram, leverages the commonalities between the two events to
> simplify their respective handling.
> 
> Suggested-by: Dan Williams <dan.j.williams@...el.com>
> Reviewed-by: Alison Schofield <alison.schofield@...el.com>
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@...ux.intel.com>
With the fix for my mistake in v6 review.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

>  
> +struct cxl_event_media_hdr {
> +	struct cxl_event_record_hdr hdr;
> +	__le64 phys_addr;
> +	u8 descriptor;
> +	u8 type;
> +	u8 transaction_type;
> +	/*
> +	 * The meaning of Validity Flags after bit 2 is
oops. I got this wrong. Sorry!

"from bit 2" 
after would not include bit 2 which is "nibble" for dram and 
"device" for media.

Maybe if Dave is happy with this one otherwise he can tidy that
up whilst applying?
 

> +	 * different across DRAM and General Media records
> +	 */
> +	u8 validity_flags[2];
> +	u8 channel;
> +	u8 rank;
> +} __packed;
> +