linux-kernel - Re: [PATCH] drm/xe: clean up type of GUC_HXG_MSG_0

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Date: Mon, 8 Jan 2024 21:46:47 +0100
From: Michal Wajdeczko <michal.wajdeczko@...el.com>
To: Lucas De Marchi <lucas.demarchi@...el.com>,
 Dan Carpenter <dan.carpenter@...aro.org>
Cc: kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
 Maxime Ripard <mripard@...nel.org>, dri-devel@...ts.freedesktop.org,
 Thomas Zimmermann <tzimmermann@...e.de>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, intel-xe@...ts.freedesktop.org
Subject: Re: [PATCH] drm/xe: clean up type of GUC_HXG_MSG_0_ORIGIN



On 08.01.2024 15:07, Lucas De Marchi wrote:
> On Mon, Jan 08, 2024 at 12:05:57PM +0300, Dan Carpenter wrote:
>> The GUC_HXG_MSG_0_ORIGIN definition should be unsigned.  Currently it is
>> defined as INT_MIN.  This doesn't cause a problem currently but it's
>> still worth cleaning up.
>>
>> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> 
> it seems there are a few more places to change to follow what was done
> in commit 962bd34bb457 ("drm/i915/uc: Fix undefined behavior due to
> shift overflowing the constant").
> 
> +Michal
> 
> Could we eventually share these abi includes with i915 so we don't
> keep fixing the same thing in 2 places?

it should be possible and I guess we should plan for that while
discussing all this new xe driver...

anyway, what about creating new intel/ folder under drm/ ?

 - drm/intel/include/abi
        guc_actions_abi.h
        guc_klvs_abi.h
        ...

the only question would be what prefix should be used for macros:
just GUC_ or INTEL_GUC_ or XE_GUC_ ?

then we can also think of creating library with common helpers for GuC
(for encoding/decoding HXG messages, preparing ADS, reading logs, etc)

btw, we can also consider sharing register definitions:

 - drm/intel/include/regs
        xe_engine_regs.h
        xe_gt_regs.h
        xe_regs_defs.h

Michal

> 
> Lucas De Marchi
> 
>> ---
>> drivers/gpu/drm/xe/abi/guc_messages_abi.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/xe/abi/guc_messages_abi.h
>> b/drivers/gpu/drm/xe/abi/guc_messages_abi.h
>> index 3d199016cf88..c04606872e48 100644
>> --- a/drivers/gpu/drm/xe/abi/guc_messages_abi.h
>> +++ b/drivers/gpu/drm/xe/abi/guc_messages_abi.h
>> @@ -40,7 +40,7 @@
>>  */
>>
>> #define GUC_HXG_MSG_MIN_LEN            1u
>> -#define GUC_HXG_MSG_0_ORIGIN            (0x1 << 31)
>> +#define GUC_HXG_MSG_0_ORIGIN            (0x1U << 31)
>> #define   GUC_HXG_ORIGIN_HOST            0u
>> #define   GUC_HXG_ORIGIN_GUC            1u
>> #define GUC_HXG_MSG_0_TYPE            (0x7 << 28)
>> -- 
>> 2.42.0
>>