Re: [igt-dev] [PATCH i-g-t] igt/gem_mmap_gtt: Checking tiling pattern requires known swizzling

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On 08/06/2018 19:54, Chris Wilson wrote:
As the swizzling is baked into the tiling pattern, the swizzling has to
be consistent across the entire GTT mmap for our tests to work. However,
under L-shaped memory configurations on older architectures, the
swizzling varied depending on which region the page found itself in --
invalidating our assumptions and ability to predict the tiling pattern.

Reported-by: Adric Blake <promarbler14@xxxxxxxxx>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106848
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
  tests/gem_mmap_gtt.c | 20 ++++++++++++++++++++
  1 file changed, 20 insertions(+)

diff --git a/tests/gem_mmap_gtt.c b/tests/gem_mmap_gtt.c
index 6a332b254..fd60b8ff8 100644
--- a/tests/gem_mmap_gtt.c
+++ b/tests/gem_mmap_gtt.c
@@ -445,6 +445,24 @@ static int max_tile_width(uint32_t devid, int tiling)
  		return 8 << 10;
  }
+static bool known_swizzling(int fd, uint32_t handle)
+{
+	struct drm_i915_gem_get_tiling2 {
+		uint32_t handle;
+		uint32_t tiling_mode;
+		uint32_t swizzle_mode;
+		uint32_t phys_swizzle_mode;
+	} arg = {
+		.handle = handle,
+	};
+#define DRM_IOCTL_I915_GEM_GET_TILING2	DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_GET_TILING, struct drm_i915_gem_get_tiling2)
+
+	if (igt_ioctl(fd, DRM_IOCTL_I915_GEM_GET_TILING2, &arg))
+		return false;
+
+	return arg.phys_swizzle_mode == arg.swizzle_mode;
+}
+
  static void
  test_huge_bo(int fd, int huge, int tiling)
  {
@@ -488,6 +506,8 @@ test_huge_bo(int fd, int huge, int tiling)
  	bo = gem_create(fd, PAGE_SIZE);
  	if (tiling)
  		igt_require(__gem_set_tiling(fd, bo, tiling, pitch) == 0);
+	igt_require(known_swizzling(fd, bo));
+
  	linear_pattern = gem_mmap__gtt(fd, bo, PAGE_SIZE,
  				       PROT_READ | PROT_WRITE);
  	for (i = 0; i < PAGE_SIZE; i++)


Had a think and couldn't come up with a way to solve it so skip sounds fine.

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko
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