[PATCH v2 2/3] drm/etnaviv: allocate unique ID per drm_file

[Lucas Stach]

Am Freitag, dem 16.09.2022 um 17:12 +0200 schrieb Lucas Stach:
> Allows to easily track if several fd are pointing to the same
> execution context due to being dup'ed.
> 
I would appreciate it if someone could review path 2 and 3 of this
series. I would like to include it in my next upstream PR.

Regards,
Lucas

> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> ---
>  drivers/gpu/drm/etnaviv/etnaviv_drv.c | 3 +++
>  drivers/gpu/drm/etnaviv/etnaviv_drv.h | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> index 1d2b4fb4bcf8..b69edb40ae2a 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> @@ -49,6 +49,7 @@ static void load_gpu(struct drm_device *dev)
>  static int etnaviv_open(struct drm_device *dev, struct drm_file *file)
>  {
>  	struct etnaviv_drm_private *priv = dev->dev_private;
> +	static atomic_t ident = ATOMIC_INIT(0);
>  	struct etnaviv_file_private *ctx;
>  	int ret, i;
>  
> @@ -56,6 +57,8 @@ static int etnaviv_open(struct drm_device *dev, struct drm_file *file)
>  	if (!ctx)
>  		return -ENOMEM;
>  
> +	ctx->id = atomic_inc_return(&ident);
> +
>  	ctx->mmu = etnaviv_iommu_context_init(priv->mmu_global,
>  					      priv->cmdbuf_suballoc);
>  	if (!ctx->mmu) {
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.h b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> index f32f4771dada..851b4b4ef146 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> @@ -27,6 +27,7 @@ struct etnaviv_iommu_global;
>  #define ETNAVIV_SOFTPIN_START_ADDRESS	SZ_4M /* must be >= SUBALLOC_SIZE */
>  
>  struct etnaviv_file_private {
> +	int id;
>  	struct etnaviv_iommu_context	*mmu;
>  	struct drm_sched_entity		sched_entity[ETNA_MAX_PIPES];
>  };