Re: [Intel-gfx] [PATCH 2/5] drm/i915/display: Set I915_BO_ALLOC_USER for fb

[Andrzej Hajda <andrzej.hajda@intel.com>]

On 04.04.2023 16:30, Nirmoy Das wrote:
> Framebuffer is exposed to userspace so make sure we set
> proper flags for it. Set I915_BO_PREALLOC for prealloced
> fb so that ttm won't clear existing data.
>
> Cc: Matthew Auld <matthew.auld@intel.com>
> Cc: Andi Shyti <andi.shyti@linux.intel.com>
> Cc: Andrzej Hajda <andrzej.hajda@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>

Regards
Andrzej
> ---
>   drivers/gpu/drm/i915/display/intel_fbdev.c         | 3 ++-
>   drivers/gpu/drm/i915/display/intel_plane_initial.c | 4 +++-
>   2 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 673bcdfb7ff6..f7d48d00ae4b 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -163,7 +163,8 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
>   	obj = ERR_PTR(-ENODEV);
>   	if (HAS_LMEM(dev_priv)) {
>   		obj = i915_gem_object_create_lmem(dev_priv, size,
> -						  I915_BO_ALLOC_CONTIGUOUS);
> +						  I915_BO_ALLOC_CONTIGUOUS |
> +						  I915_BO_ALLOC_USER);
>   	} else {
>   		/*
>   		 * If the FB is too big, just don't use it since fbdev is not very
> diff --git a/drivers/gpu/drm/i915/display/intel_plane_initial.c b/drivers/gpu/drm/i915/display/intel_plane_initial.c
> index bb6ea7de5c61..736072a8b2b0 100644
> --- a/drivers/gpu/drm/i915/display/intel_plane_initial.c
> +++ b/drivers/gpu/drm/i915/display/intel_plane_initial.c
> @@ -110,7 +110,9 @@ initial_plane_vma(struct drm_i915_private *i915,
>   	    size * 2 > i915->dsm.usable_size)
>   		return NULL;
>   
> -	obj = i915_gem_object_create_region_at(mem, phys_base, size, 0);
> +	obj = i915_gem_object_create_region_at(mem, phys_base, size,
> +					       I915_BO_ALLOC_USER |
> +					       I915_BO_PREALLOC);
>   	if (IS_ERR(obj))
>   		return NULL;
>