Re: [igt-dev] [PATCH 5/8] igt: fb: Move i915 buffer allocation to a function of its own

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Dec 04, 2018 at 11:08:19AM +0100, Maxime Ripard wrote:
> The create_bo_for_fb function has a rather big, non trivial block of
> code to allocate buffers in some non-trivial situation on the i915
> driver.
> 
> Since this is both non-trivial and driver specific, move that code
> into a function of its own so that we can rework that function later
> on.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
> ---
>  lib/igt_fb.c | 89 +++++++++++++++++++++++++++--------------------------
>  1 file changed, 47 insertions(+), 42 deletions(-)
> 
> diff --git a/lib/igt_fb.c b/lib/igt_fb.c
> index 2462d6ba6fab..d96689aa5fe6 100644
> --- a/lib/igt_fb.c
> +++ b/lib/igt_fb.c
> @@ -453,6 +453,52 @@ uint64_t igt_fb_tiling_to_mod(uint64_t tiling)
>  	}
>  }
>  
> +static int i915_create_gem_for_fb(struct igt_fb *fb)
> +{
> +	bool full_range = fb->color_range == IGT_COLOR_YCBCR_FULL_RANGE;
> +	int fd = fb->fd;
> +	void *ptr;
> +
> +	fb->gem_handle = gem_create(fd, fb->size);
> +	gem_set_tiling(fd, fb->gem_handle,
> +		       igt_fb_mod_to_tiling(fb->tiling),
> +		       fb->strides[0]);
> +
> +	gem_set_domain(fd, fb->gem_handle,
> +		       I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
> +
> +	/* Ensure the framebuffer is preallocated */
> +	ptr = gem_mmap__gtt(fd, fb->gem_handle,
> +			    fb->size, PROT_READ | PROT_WRITE);
> +	igt_assert(*(uint32_t *)ptr == 0);
> +
> +	switch (fb->drm_format) {
> +	case DRM_FORMAT_NV12:
> +		memset(ptr + fb->offsets[0],
> +		       full_range ? 0x00 : 0x10,
> +		       fb->strides[0] * fb->plane_height[0]);
> +		memset(ptr + fb->offsets[1],
> +		       0x80,
> +		       fb->strides[1] * fb->plane_height[1]);
> +		break;
> +	case DRM_FORMAT_YUYV:
> +	case DRM_FORMAT_YVYU:
> +		wmemset(ptr + fb->offsets[0],
> +			full_range ? 0x80008000 : 0x80108010,
> +			fb->strides[0] * fb->plane_height[0] / sizeof(wchar_t));
> +		break;
> +	case DRM_FORMAT_UYVY:
> +	case DRM_FORMAT_VYUY:
> +		wmemset(ptr + fb->offsets[0],
> +			full_range ? 0x00800080 : 0x10801080,
> +			fb->strides[0] * fb->plane_height[0] / sizeof(wchar_t));
> +		break;
> +	}
> +	gem_munmap(ptr, fb->size);

We should probably extract this memset() stuff into a separate
function because every driver will require it.

> +
> +	return fb->gem_handle;
> +}
> +
>  /* helpers to create nice-looking framebuffers */
>  static int create_bo_for_fb(struct igt_fb *fb)
>  {
> @@ -470,48 +516,7 @@ static int create_bo_for_fb(struct igt_fb *fb)
>  		fb->is_dumb = false;
>  
>  		if (is_i915_device(fd)) {
> -			void *ptr;
> -			bool full_range = fb->color_range == IGT_COLOR_YCBCR_FULL_RANGE;
> -
> -			fb->gem_handle = gem_create(fd, fb->size);
> -
> -			gem_set_tiling(fd, fb->gem_handle,
> -				       igt_fb_mod_to_tiling(fb->tiling),
> -				       fb->strides[0]);
> -
> -			gem_set_domain(fd, fb->gem_handle,
> -				       I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
> -
> -			/* Ensure the framebuffer is preallocated */
> -			ptr = gem_mmap__gtt(fd, fb->gem_handle,
> -					    fb->size, PROT_READ | PROT_WRITE);
> -			igt_assert(*(uint32_t *)ptr == 0);
> -
> -			switch (fb->drm_format) {
> -			case DRM_FORMAT_NV12:
> -				memset(ptr + fb->offsets[0],
> -				       full_range ? 0x00 : 0x10,
> -				       fb->strides[0] * fb->plane_height[0]);
> -				memset(ptr + fb->offsets[1],
> -				       0x80,
> -				       fb->strides[1] * fb->plane_height[1]);
> -				break;
> -			case DRM_FORMAT_YUYV:
> -			case DRM_FORMAT_YVYU:
> -				wmemset(ptr + fb->offsets[0],
> -					full_range ? 0x80008000 : 0x80108010,
> -					fb->strides[0] * fb->plane_height[0] / sizeof(wchar_t));
> -				break;
> -			case DRM_FORMAT_UYVY:
> -			case DRM_FORMAT_VYUY:
> -				wmemset(ptr + fb->offsets[0],
> -					full_range ? 0x00800080 : 0x10801080,
> -					fb->strides[0] * fb->plane_height[0] / sizeof(wchar_t));
> -				break;
> -			}
> -			gem_munmap(ptr, fb->size);
> -
> -			return fb->gem_handle;
> +			return i915_create_gem_for_fb(fb);
>  		} else {
>  			bool driver_has_gem_api = false;
>  
> -- 
> git-series 0.9.1

-- 
Ville Syrjälä
Intel
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