[Intel-gfx] [PATCH igt] lib: Disable MI_STORE_DATA_IMM for gen3 (i915g and i915gm)

[Chris Wilson]

The early gen3 machines inherited the MI block and restrictions from
gen2, and may only use physical addresses in conjunction with
MI_STORE_DATA_IMM -- that makes it unusable for us from userspace, where
we can only use virtual offsets.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 lib/igt_gt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/igt_gt.c b/lib/igt_gt.c
index d5e8b557..b3f3b380 100644
--- a/lib/igt_gt.c
+++ b/lib/igt_gt.c
@@ -557,6 +557,9 @@ bool gem_can_store_dword(int fd, unsigned int engine)
 	if (gen <= 2) /* requires physical addresses */
 		return false;
 
+	if (gen == 3 && (info->is_grantsdale || info->is_alviso))
+		return false; /* only supports physical addresses */
+
 	if (gen == 6 && (engine & ~(3<<13)) == I915_EXEC_BSD)
 		return false; /* kills the machine! */
 
-- 
2.14.1