[RFC PATCH 2/2] drm/xe/uapi: Expose wmtp as engine capability

[Nirmoy Das]

On 2/16/2024 8:52 PM, Matt Roper wrote:
> On Sat, Feb 03, 2024 at 07:05:34AM +0100, Nirmoy Das wrote:
>> Add capabilities to engine struct which can be used to
>> expose various capabilities of each engines.
>>
>> Add wmtp as engine capability which is retrieve from
>> GT info.
>>
>> Take a field from the reserved for that purpose.
>>
>> Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
> We'll need a userspace consumer for the uapi and some simple IGT tests
> (e.g., making sure this flag never shows up on the wrong engine types or
> platforms), but once those are available,

Thanks Matt, I wanted to get initial feedback.  I will now sync up with 
UMD friends to create a pull request for this, and also work on  IGT tests.


>
>          Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
>
>
> Matt
>
>> ---
>>   drivers/gpu/drm/xe/xe_query.c | 5 +++++
>>   include/uapi/drm/xe_drm.h     | 6 ++++--
>>   2 files changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/xe/xe_query.c b/drivers/gpu/drm/xe/xe_query.c
>> index 7e924faeeea0..10981b46c56f 100644
>> --- a/drivers/gpu/drm/xe/xe_query.c
>> +++ b/drivers/gpu/drm/xe/xe_query.c
>> @@ -215,6 +215,11 @@ static int query_engines(struct xe_device *xe,
>>   			engines->engines[i].instance.pad = 0;
>>   			memset(engines->engines[i].reserved, 0,
>>   			       sizeof(engines->engines[i].reserved));
>> +			if (gt->info.has_wmtp &&
>> +			    (hwe->class == XE_ENGINE_CLASS_COMPUTE ||
>> +			     hwe->class == XE_ENGINE_CLASS_RENDER))
>> +				engines->engines[i].capabilities |=
>> +					DRM_XE_ENGINE_CAPABILITY_WMTP;
>>   
>>   			i++;
>>   		}
>> diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
>> index 50bbea0992d9..5dac079e64de 100644
>> --- a/include/uapi/drm/xe_drm.h
>> +++ b/include/uapi/drm/xe_drm.h
>> @@ -247,9 +247,11 @@ struct drm_xe_engine_class_instance {
>>   struct drm_xe_engine {
>>   	/** @instance: The @drm_xe_engine_class_instance */
>>   	struct drm_xe_engine_class_instance instance;
>> -
>> +#define DRM_XE_ENGINE_CAPABILITY_WMTP		BIT(0)
>> +	/** @capabilities: Capabilities of this engine. */
>> +	__u64 capabilities;
>>   	/** @reserved: Reserved */
>> -	__u64 reserved[3];
>> +	__u64 reserved[2];
>>   };
>>   
>>   /**
>> -- 
>> 2.42.0
>>