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 16384 tiles in the worst case (linear 4x1 tiled FB).
v2:
- Fix worst case tile height formula in commit log. (Ville)
- Add an assign_chk_ovf helper to simplify the related assignments.
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_fb.c | 15 +++++++++++----
drivers/gpu/drm/i915/i915_vma_types.h | 12 ++++++++----
2 files changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
index b56c432e0415f..e153f6ae1298c 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.c
+++ b/drivers/gpu/drm/i915/display/intel_fb.c
@@ -613,6 +613,11 @@ plane_view_height_tiles(const struct intel_framebuffer *fb, int color_plane,
return DIV_ROUND_UP(y + dims->height, dims->tile_height);
}
+#define assign_chk_ovf(i915, var, val) ({ \
+ drm_WARN_ON(&(i915)->drm, overflows_type(val, var)); \
+ var = val; \
+})
+
static u32 calc_plane_remap_info(const struct intel_framebuffer *fb, int color_plane,
const struct fb_plane_view_dims *dims,
u32 obj_offset, u32 gtt_offset, int x, int y,
@@ -627,10 +632,10 @@ static u32 calc_plane_remap_info(const struct intel_framebuffer *fb, int color_p
unsigned int pitch_tiles;
struct drm_rect r;
- remap_info->offset = obj_offset;
- remap_info->stride = plane_view_stride_tiles(fb, color_plane, dims);
- remap_info->width = plane_view_width_tiles(fb, color_plane, dims, x);
- remap_info->height = plane_view_height_tiles(fb, color_plane, dims, y);
+ assign_chk_ovf(i915, remap_info->offset, obj_offset);
+ assign_chk_ovf(i915, remap_info->stride, plane_view_stride_tiles(fb, color_plane, dims));
+ assign_chk_ovf(i915, remap_info->width, plane_view_width_tiles(fb, color_plane, dims, x));
+ assign_chk_ovf(i915, remap_info->height, plane_view_height_tiles(fb, color_plane, dims, y));
if (view->gtt.type == I915_GGTT_VIEW_ROTATED) {
check_array_bounds(i915, view->gtt.rotated.plane, color_plane);
@@ -676,6 +681,8 @@ static u32 calc_plane_remap_info(const struct intel_framebuffer *fb, int color_p
return remap_info->width * remap_info->height;
}
+#undef assign_chk_ovf
+
/* Return number of tiles @color_plane needs. */
static unsigned int
calc_plane_normal_size(const struct intel_framebuffer *fb, int color_plane,
diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
index f5cb848b7a7eb..358b4306fc002 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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