[Freedreno] [PATCH] drm/msm/a6xx: add a6xx_gpu_state_get

[Jordan Crouse]

On Thu, Dec 20, 2018 at 10:46:45AM -0800, Chia-I Wu wrote:
> It gets the generic states from the adreno core.
> 
> This also adds a missing NULL check in msm_gpu_open.
> 
> Signed-off-by: Chia-I Wu <olvaffe at gmail.com>

Thanks for the patch.  We have an expanded version of the 6xx gpu state in
msm-next [1].  You can look at that and see if it meets your needs and then let
us know if you have any suggestions.

Jordan

[1] https://cgit.freedesktop.org/~robclark/linux/commit/?h=msm-next&id=1707add815519da406c2d1444a1f10ef8bb4ad5b

> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 44 +++++++++++++++++++++++++++
>  drivers/gpu/drm/msm/msm_debugfs.c     |  2 +-
>  2 files changed, 45 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 631257c297fd..dff3367aa432 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -778,6 +778,48 @@ static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
>  	return (unsigned long)busy_time;
>  }
>  
> +struct a6xx_gpu_state {
> +	struct msm_gpu_state base;
> +};
> +
> +static struct msm_gpu_state *a6xx_gpu_state_get(struct msm_gpu *gpu)
> +{
> +	struct a6xx_gpu_state *a6xx_state = kzalloc(sizeof(*a6xx_state),
> +			GFP_KERNEL);
> +
> +	if (!a6xx_state)
> +		return ERR_PTR(-ENOMEM);
> +
> +	/* Temporarily disable hardware clock gating before reading the hw */
> +	a6xx_set_hwcg(gpu, false);
> +
> +	/* get the generic state from the adreno core */
> +	adreno_gpu_state_get(gpu, &(a6xx_state->base));
> +
> +	a6xx_set_hwcg(gpu, true);
> +
> +	return &a6xx_state->base;
> +}
> +
> +static void a6xx_gpu_state_destroy(struct kref *kref)
> +{
> +	struct msm_gpu_state *state = container_of(kref,
> +		struct msm_gpu_state, ref);
> +	struct a6xx_gpu_state *a6xx_state = container_of(state,
> +		struct a6xx_gpu_state, base);
> +
> +	adreno_gpu_state_destroy(state);
> +	kfree(a6xx_state);
> +}
> +
> +static int a6xx_gpu_state_put(struct msm_gpu_state *state)
> +{
> +	if (IS_ERR_OR_NULL(state))
> +		return 1;
> +
> +	return kref_put(&state->ref, a6xx_gpu_state_destroy);
> +}
> +
>  static const struct adreno_gpu_funcs funcs = {
>  	.base = {
>  		.get_param = adreno_get_param,
> @@ -794,6 +836,8 @@ static const struct adreno_gpu_funcs funcs = {
>  		.show = a6xx_show,
>  #endif
>  		.gpu_busy = a6xx_gpu_busy,
> +		.gpu_state_get = a6xx_gpu_state_get,
> +		.gpu_state_put = a6xx_gpu_state_put,
>  		.gpu_get_freq = a6xx_gmu_get_freq,
>  		.gpu_set_freq = a6xx_gmu_set_freq,
>  	},
> diff --git a/drivers/gpu/drm/msm/msm_debugfs.c b/drivers/gpu/drm/msm/msm_debugfs.c
> index f0da0d3c8a80..ee80856c4476 100644
> --- a/drivers/gpu/drm/msm/msm_debugfs.c
> +++ b/drivers/gpu/drm/msm/msm_debugfs.c
> @@ -75,7 +75,7 @@ static int msm_gpu_open(struct inode *inode, struct file *file)
>  	struct msm_gpu_show_priv *show_priv;
>  	int ret;
>  
> -	if (!gpu)
> +	if (!gpu || !gpu->funcs->gpu_state_get)
>  		return -ENODEV;
>  
>  	show_priv = kmalloc(sizeof(*show_priv), GFP_KERNEL);
> -- 
> 2.20.1.415.g653613c723-goog
> 
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> Freedreno at lists.freedesktop.org
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