linux-kernel - Re: [PATCH 2/2] drm/panfrost: Merge some feature lists

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Date:   Wed, 12 Jan 2022 16:28:12 +0000
From:   Steven Price <steven.price@....com>
To:     Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        dri-devel@...ts.freedesktop.org
Cc:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/panfrost: Merge some feature lists

On 09/01/2022 17:09, Alyssa Rosenzweig wrote:
> Now that we only list features of interest to kernel space, lots of GPUs
> have the same feature bits. To cut down on the repetition in the file,
> merge feature lists that are identical between similar GPUs.
> 
> Note that this leaves some unmerged identical Bifrost feature lists, as
> there are more features affecting Bifrost kernel space that we do not
> yet hanlde.

NIT: s/hanlde/handle/ ;)

Do you have any features in mind that we're missing? The list looks very
similar to the kbase one. And anyway it is simple enough to split again
if we need to.

Thanks,

Steve

> 
> Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
> ---
>  drivers/gpu/drm/panfrost/panfrost_features.h | 40 ++++----------------
>  1 file changed, 7 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_features.h b/drivers/gpu/drm/panfrost/panfrost_features.h
> index f557fad5d5ff..34f2bae1ec8c 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_features.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_features.h
> @@ -27,14 +27,9 @@ enum panfrost_hw_feature {
>  	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT) | \
>  	BIT_ULL(HW_FEATURE_V4))
>  
> -#define hw_features_t620 (\
> -	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT) | \
> -	BIT_ULL(HW_FEATURE_V4))
> -
> -#define hw_features_t720 (\
> -	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT) | \
> -	BIT_ULL(HW_FEATURE_V4))
> +#define hw_features_t620 hw_features_t600
>  
> +#define hw_features_t720 hw_features_t600
>  
>  #define hw_features_t760 (\
>  	BIT_ULL(HW_FEATURE_JOBCHAIN_DISAMBIGUATION) | \
> @@ -42,26 +37,13 @@ enum panfrost_hw_feature {
>  	BIT_ULL(HW_FEATURE_XAFFINITY) | \
>  	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT))
>  
> -// T860
> -#define hw_features_t860 (\
> -	BIT_ULL(HW_FEATURE_JOBCHAIN_DISAMBIGUATION) | \
> -	BIT_ULL(HW_FEATURE_PWRON_DURING_PWROFF_TRANS) | \
> -	BIT_ULL(HW_FEATURE_XAFFINITY) | \
> -	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT))
> +#define hw_features_t860 hw_features_t760
>  
> -#define hw_features_t880 hw_features_t860
> +#define hw_features_t880 hw_features_t760
>  
> -#define hw_features_t830 (\
> -	BIT_ULL(HW_FEATURE_JOBCHAIN_DISAMBIGUATION) | \
> -	BIT_ULL(HW_FEATURE_PWRON_DURING_PWROFF_TRANS) | \
> -	BIT_ULL(HW_FEATURE_XAFFINITY) | \
> -	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT))
> +#define hw_features_t830 hw_features_t760
>  
> -#define hw_features_t820 (\
> -	BIT_ULL(HW_FEATURE_JOBCHAIN_DISAMBIGUATION) | \
> -	BIT_ULL(HW_FEATURE_PWRON_DURING_PWROFF_TRANS) | \
> -	BIT_ULL(HW_FEATURE_XAFFINITY) | \
> -	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT))
> +#define hw_features_t820 hw_features_t760
>  
>  #define hw_features_g71 (\
>  	BIT_ULL(HW_FEATURE_JOBCHAIN_DISAMBIGUATION) | \
> @@ -82,15 +64,7 @@ enum panfrost_hw_feature {
>  	BIT_ULL(HW_FEATURE_PROTECTED_DEBUG_MODE) | \
>  	BIT_ULL(HW_FEATURE_COHERENCY_REG))
>  
> -#define hw_features_g51 (\
> -	BIT_ULL(HW_FEATURE_JOBCHAIN_DISAMBIGUATION) | \
> -	BIT_ULL(HW_FEATURE_PWRON_DURING_PWROFF_TRANS) | \
> -	BIT_ULL(HW_FEATURE_XAFFINITY) | \
> -	BIT_ULL(HW_FEATURE_THREAD_GROUP_SPLIT) | \
> -	BIT_ULL(HW_FEATURE_FLUSH_REDUCTION) | \
> -	BIT_ULL(HW_FEATURE_PROTECTED_MODE) | \
> -	BIT_ULL(HW_FEATURE_PROTECTED_DEBUG_MODE) | \
> -	BIT_ULL(HW_FEATURE_COHERENCY_REG))
> +#define hw_features_g51 hw_features_g72
>  
>  #define hw_features_g52 (\
>  	BIT_ULL(HW_FEATURE_JOBCHAIN_DISAMBIGUATION) | \
>