[PATCH i-g-t] lib/intel_compute: Add documentation of global workgroup size

[Nirmoy Das]

On 3/18/2024 9:52 AM, janga.rahul.kumar at intel.com wrote:
> From: Janga Rahul Kumar<janga.rahul.kumar at intel.com>
>
> Global workgroup size is calculated based on local X/Y/Z maximum
> and thread group id X dimension.
>
> Cc: Nirmoy Das<nirmoy.das at intel.com>
> Signed-off-by: Janga Rahul Kumar<janga.rahul.kumar at intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>
> ---
>   lib/intel_compute.c | 12 ++++++++----
>   1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/lib/intel_compute.c b/lib/intel_compute.c
> index 9d3b97efe..72025a481 100644
> --- a/lib/intel_compute.c
> +++ b/lib/intel_compute.c
> @@ -1243,15 +1243,19 @@ static void xe2lpg_compute_exec_compute(uint32_t *addr_bo_buffer_batch,
>   	addr_bo_buffer_batch[b++] = offset_indirect_data_start;
>   	addr_bo_buffer_batch[b++] = 0xbe040000;
>   	addr_bo_buffer_batch[b++] = 0xffffffff;
> -	addr_bo_buffer_batch[b++] = 0x000003ff;
> +	addr_bo_buffer_batch[b++] = 0x000003ff; // Local X/Y/Z Dimension
>   
>   	if (threadgroup_preemption)
> -		addr_bo_buffer_batch[b++] = 0x00200000; // Global workgroup size
> +		/*
> +		 * Create multiple threadgroups using higher gloabl workgroup size
> +		 * Global Workgroup size = Local X * Thread Group X +  Local Y * Thread Group Y + Local Z * Thread Group Z
> +		 */
> +		addr_bo_buffer_batch[b++] = 0x00200000; // Thread Group ID X Dimension
>   	else
>   		addr_bo_buffer_batch[b++] = 0x00000002;
>   
> -	addr_bo_buffer_batch[b++] = 0x00000001;
> -	addr_bo_buffer_batch[b++] = 0x00000001;
> +	addr_bo_buffer_batch[b++] = 0x00000001; // Thread Group ID Y Dimension
> +	addr_bo_buffer_batch[b++] = 0x00000001; // Thread Group ID Z Dimension
>   	addr_bo_buffer_batch[b++] = 0x00000000;
>   	addr_bo_buffer_batch[b++] = 0x00000000;
>   	addr_bo_buffer_batch[b++] = 0x00000000;
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