6.6-stable review patch. If anyone has any objections, please let me know.
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From: Ville Syrjälä ville.syrjala@linux.intel.com
commit 324b70e997aab0a7deab8cb90711faccda4e98c8 upstream.
plane_view_scanout_stride() currently assumes that we had to pad the mapping stride with dummy pages in order to align it. But that is not the case if the original fb stride exceeds the aligned stride used to populate the remapped view, which is calculated from the user specified framebuffer width rather than the user specified framebuffer stride.
Ignore the original fb stride in this case and just stick to the POT aligned stride. Getting this wrong will cause the plane to fetch the wrong data, and can lead to fault errors if the page tables at the bogus location aren't even populated.
TODO: figure out if this is OK for CCS, or if we should instead increase the width of the view to cover the entire user specified fb stride instead...
Cc: Imre Deak imre.deak@intel.com Cc: Juha-Pekka Heikkila juhapekka.heikkila@gmail.com Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20231204202443.31247-1-ville.s... Reviewed-by: Imre Deak imre.deak@intel.com Reviewed-by: Juha-Pekka Heikkila juhapekka.heikkila@gmail.com (cherry picked from commit 01a39f1c4f1220a4e6a25729fae87ff5794cbc52) Cc: stable@vger.kernel.org Signed-off-by: Jani Nikula jani.nikula@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_fb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/display/intel_fb.c +++ b/drivers/gpu/drm/i915/display/intel_fb.c @@ -1370,7 +1370,8 @@ plane_view_scanout_stride(const struct i struct drm_i915_private *i915 = to_i915(fb->base.dev); unsigned int stride_tiles;
- if (IS_ALDERLAKE_P(i915) || DISPLAY_VER(i915) >= 14) + if ((IS_ALDERLAKE_P(i915) || DISPLAY_VER(i915) >= 14) && + src_stride_tiles < dst_stride_tiles) stride_tiles = src_stride_tiles; else stride_tiles = dst_stride_tiles;