Mesa (main): crocus/blt: add pitch/offset checks to fix blt corruption
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Wed Aug 11 19:33:08 UTC 2021
Module: Mesa
Branch: main
Commit: 58e95f99bd5dde83eb2a7ab6d1ee2735eed432d9
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=58e95f99bd5dde83eb2a7ab6d1ee2735eed432d9
Author: Dave Airlie <airlied at gmail.com>
Date: Wed Aug 11 13:32:41 2021 -0400
crocus/blt: add pitch/offset checks to fix blt corruption
I lost these in my conversion from i965 but they are necessary.
This should fix corruption in qt fonts at seen in the minecraft
launcher.
Fixes: f3630548f1da ("crocus: initial gallium driver for Intel gfx 4-7")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12329>
---
src/gallium/drivers/crocus/crocus_blt.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/gallium/drivers/crocus/crocus_blt.c b/src/gallium/drivers/crocus/crocus_blt.c
index fd318a8dce8..fb194657a9b 100644
--- a/src/gallium/drivers/crocus/crocus_blt.c
+++ b/src/gallium/drivers/crocus/crocus_blt.c
@@ -188,6 +188,13 @@ static bool emit_copy_blt(struct crocus_batch *batch,
}
}
+ /* Blit pitch must be dword-aligned. Otherwise, the hardware appears to drop
+ * the low bits. Offsets must be naturally aligned.
+ */
+ if (src_pitch % 4 != 0 || src_offset % cpp != 0 ||
+ dst_pitch % 4 != 0 || dst_offset % cpp != 0)
+ return false;
+
/* For tiled source and destination, pitch value should be specified
* as a number of Dwords.
*/
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