Save some place in the GTT VMAs by using a u16 instead of unsigned int
to store the view dimensions. The maximum FB stride is 256kB which is
4096 tiles in the worst case (yf-tiles), the maximum FB height is 16k
pixels, which is 2048 tiles in the worst case (x-tiles).
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_fb.c | 15 ++++++++++++---
drivers/gpu/drm/i915/i915_vma_types.h | 12 ++++++++----
2 files changed, 20 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
index 16a1b5c922bb..51c56f0a4a99 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.c
+++ b/drivers/gpu/drm/i915/display/intel_fb.c
@@ -619,13 +619,22 @@ static u32 calc_plane_remap_info(const struct intel_framebuffer *fb, int color_p
unsigned int tile_width = dims->tile_width;
unsigned int tile_height = dims->tile_height;
unsigned int tile_size = intel_tile_size(i915);
+ unsigned int stride_tiles = plane_view_stride_tiles(fb, color_plane, dims);
+ unsigned int width_tiles = DIV_ROUND_UP(x + dims->width, dims->tile_width);
+ unsigned int height_tiles = plane_view_tile_rows(fb, color_plane, dims, y);
unsigned int pitch_tiles;
struct drm_rect r;
+ drm_WARN_ON(&i915->drm,
+ overflows_type(obj_offset, gtt_remap_info->offset) ||
+ overflows_type(stride_tiles, gtt_remap_info->stride) ||
+ overflows_type(width_tiles, gtt_remap_info->width) ||
+ overflows_type(height_tiles, gtt_remap_info->height));
+
gtt_remap_info->offset = obj_offset;
- gtt_remap_info->width = DIV_ROUND_UP(x + dims->width, dims->tile_width);
- gtt_remap_info->height = plane_view_tile_rows(fb, color_plane, dims, y);
- gtt_remap_info->stride = plane_view_stride_tiles(fb, color_plane, dims);
+ gtt_remap_info->stride = stride_tiles;
+ gtt_remap_info->width = width_tiles;
+ gtt_remap_info->height = height_tiles;
if (view_type == I915_GGTT_VIEW_ROTATED) {
/* rotate the x/y offsets to match the GTT view */
diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
index f5cb848b7a7e..358b4306fc00 100644
--- a/drivers/gpu/drm/i915/i915_vma_types.h
+++ b/drivers/gpu/drm/i915/i915_vma_types.h
@@ -97,12 +97,16 @@ enum i915_cache_level;
struct intel_remapped_plane_info {
/* in gtt pages */
- unsigned int width, height, stride, offset;
+ u32 offset;
+ u16 width;
+ u16 height;
+ u16 stride;
+ u16 unused_mbz;
} __packed;
struct intel_remapped_info {
struct intel_remapped_plane_info plane[2];
- unsigned int unused_mbz;
+ u32 unused_mbz;
} __packed;
struct intel_rotation_info {
@@ -123,9 +127,9 @@ enum i915_ggtt_view_type {
static inline void assert_i915_gem_gtt_types(void)
{
- BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 8*sizeof(unsigned int));
+ BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 2 * sizeof(u32) + 8 * sizeof(u16));
BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int));
- BUILD_BUG_ON(sizeof(struct intel_remapped_info) != 9*sizeof(unsigned int));
+ BUILD_BUG_ON(sizeof(struct intel_remapped_info) != 3 * sizeof(u32) + 8 * sizeof(u16));
/* Check that rotation/remapped shares offsets for simplicity */
BUILD_BUG_ON(offsetof(struct intel_remapped_info, plane[0]) !=
--
2.25.1
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