[Mesa-stable] [PATCH] ac/radeonsi: fix CIK copy max size

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

While adding transfer queues to radv, I started writing some tests,
the first test I wrote fell over copying a buffer larger than this
limit.

Checked AMDVLK and found the correct limit.

Cc: <mesa-stable at lists.freedesktop.org>
---
 src/amd/common/sid.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/amd/common/sid.h b/src/amd/common/sid.h
index 0671f7d3998..edb7d06afa6 100644
--- a/src/amd/common/sid.h
+++ b/src/amd/common/sid.h
@@ -9139,7 +9139,9 @@
 #define    CIK_SDMA_PACKET_SEMAPHORE               0x7
 #define    CIK_SDMA_PACKET_CONSTANT_FILL           0xb
 #define    CIK_SDMA_PACKET_SRBM_WRITE              0xe
-#define    CIK_SDMA_COPY_MAX_SIZE                  0x3fffe0
+/* There is apparently an undocumented HW "feature" that
+   prevents the HW from copying past 256 bytes of (1 << 22) */
+#define    CIK_SDMA_COPY_MAX_SIZE                  0x3fff00
 
 enum amd_cmp_class_flags {
 	S_NAN = 1 << 0,        // Signaling NaN
-- 
2.17.1