diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_gtt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_gtt.c | 117 |
1 files changed, 113 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 645c3636c571..fc56c112a7de 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -2500,15 +2500,119 @@ i915_gem_obj_lookup_or_create_ggtt_vma(struct drm_i915_gem_object *obj, } +static void +rotate_pages(dma_addr_t *in, unsigned int width, unsigned int height, + struct sg_table *st) +{ + unsigned int column, row; + unsigned int src_idx; + struct scatterlist *sg = st->sgl; + + st->nents = 0; + + for (column = 0; column < width; column++) { + src_idx = width * (height - 1) + column; + for (row = 0; row < height; row++) { + st->nents++; + /* We don't need the pages, but need to initialize + * the entries so the sg list can be happily traversed. + * The only thing we need are DMA addresses. + */ + sg_set_page(sg, NULL, PAGE_SIZE, 0); + sg_dma_address(sg) = in[src_idx]; + sg_dma_len(sg) = PAGE_SIZE; + sg = sg_next(sg); + src_idx -= width; + } + } +} + +static struct sg_table * +intel_rotate_fb_obj_pages(struct i915_ggtt_view *ggtt_view, + struct drm_i915_gem_object *obj) +{ + struct drm_device *dev = obj->base.dev; + struct intel_rotation_info *rot_info = &ggtt_view->rotation_info; + unsigned long size, pages, rot_pages; + struct sg_page_iter sg_iter; + unsigned long i; + dma_addr_t *page_addr_list; + struct sg_table *st; + unsigned int tile_pitch, tile_height; + unsigned int width_pages, height_pages; + int ret = ENOMEM; + + pages = obj->base.size / PAGE_SIZE; + + /* Calculate tiling geometry. */ + tile_height = intel_tile_height(dev, rot_info->pixel_format, + rot_info->fb_modifier); + tile_pitch = PAGE_SIZE / tile_height; + width_pages = DIV_ROUND_UP(rot_info->pitch, tile_pitch); + height_pages = DIV_ROUND_UP(rot_info->height, tile_height); + rot_pages = width_pages * height_pages; + size = rot_pages * PAGE_SIZE; + + /* Allocate a temporary list of source pages for random access. */ + page_addr_list = drm_malloc_ab(pages, sizeof(dma_addr_t)); + if (!page_addr_list) + return ERR_PTR(ret); + + /* Allocate target SG list. */ + st = kmalloc(sizeof(*st), GFP_KERNEL); + if (!st) + goto err_st_alloc; + + ret = sg_alloc_table(st, rot_pages, GFP_KERNEL); + if (ret) + goto err_sg_alloc; + + /* Populate source page list from the object. */ + i = 0; + for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) { + page_addr_list[i] = sg_page_iter_dma_address(&sg_iter); + i++; + } + + /* Rotate the pages. */ + rotate_pages(page_addr_list, width_pages, height_pages, st); + + DRM_DEBUG_KMS( + "Created rotated page mapping for object size %lu (pitch=%u, height=%u, pixel_format=0x%x, %ux%u tiles, %lu pages).\n", + size, rot_info->pitch, rot_info->height, + rot_info->pixel_format, width_pages, height_pages, + rot_pages); + + drm_free_large(page_addr_list); + + return st; + +err_sg_alloc: + kfree(st); +err_st_alloc: + drm_free_large(page_addr_list); + + DRM_DEBUG_KMS( + "Failed to create rotated mapping for object size %lu! (%d) (pitch=%u, height=%u, pixel_format=0x%x, %ux%u tiles, %lu pages)\n", + size, ret, rot_info->pitch, rot_info->height, + rot_info->pixel_format, width_pages, height_pages, + rot_pages); + return ERR_PTR(ret); +} -static inline -int i915_get_ggtt_vma_pages(struct i915_vma *vma) +static inline int +i915_get_ggtt_vma_pages(struct i915_vma *vma) { + int ret = 0; + if (vma->ggtt_view.pages) return 0; if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) vma->ggtt_view.pages = vma->obj->pages; + else if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED) + vma->ggtt_view.pages = + intel_rotate_fb_obj_pages(&vma->ggtt_view, vma->obj); else WARN_ONCE(1, "GGTT view %u not implemented!\n", vma->ggtt_view.type); @@ -2516,10 +2620,15 @@ int i915_get_ggtt_vma_pages(struct i915_vma *vma) if (!vma->ggtt_view.pages) { DRM_ERROR("Failed to get pages for GGTT view type %u!\n", vma->ggtt_view.type); - return -EINVAL; + ret = -EINVAL; + } else if (IS_ERR(vma->ggtt_view.pages)) { + ret = PTR_ERR(vma->ggtt_view.pages); + vma->ggtt_view.pages = NULL; + DRM_ERROR("Failed to get pages for VMA view type %u (%d)!\n", + vma->ggtt_view.type, ret); } - return 0; + return ret; } /** |