> +/**
> + * drm_gem_vram_unpin() - Unpins a GEM VRAM object
> + * @gbo: the GEM VRAM object
> + *
> + * Returns:
> + * 0 on success, or
> + * a negative error code otherwise.
> + */
> +int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo)
> +{
> + int i, ret;
> + struct ttm_operation_ctx ctx = { false, false };
> +
> + if (!gbo->pin_count)
> + return 0;
WARN_ON_ONCE() here? That should not happen ...
> +/**
> + * drm_gem_vram_push_to_system() - \
> + Unpins a GEM VRAM object and moves it to system memory
> + * @gbo: the GEM VRAM object
> + *
> + * This operation only works if the caller holds the final pin on the
> + * buffer object.
> + *
> + * Returns:
> + * 0 on success, or
> + * a negative error code otherwise.
> + */
> +int drm_gem_vram_push_to_system(struct drm_gem_vram_object *gbo)
> +{
> + int i, ret;
> + struct ttm_operation_ctx ctx = { false, false };
> +
> + if (!gbo->pin_count)
> + return 0;
Likewise.
> + --gbo->pin_count;
> + if (gbo->pin_count)
> + return 0;
> +
> + if (gbo->kmap.virtual)
> + ttm_bo_kunmap(&gbo->kmap);
> +
> + drm_gem_vram_placement(gbo, TTM_PL_FLAG_SYSTEM);
> + for (i = 0; i < gbo->placement.num_placement ; ++i)
> + gbo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
> +
> + ret = ttm_bo_validate(&gbo->bo, &gbo->placement, &ctx);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_gem_vram_push_to_system);
Very simliar to drm_gem_vram_unpin, can't we just call that function?
Something like this:
drm_gem_vram_push_to_system()
{
if (gbo->pin_count == 1 && gbo->kmap.virtual)
ttm_bo_kunmap(&gbo->kmap);
return drm_gem_vram_unpin();
}
> +struct drm_gem_vram_object {
> + /* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
> + struct ttm_placement placement;
> + struct ttm_place placements[3];
placements[2] should be enough I guess?
cheers,
Gerd
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