On 07/08/2018 16:44, Chris Wilson wrote:
Link a vgem dmabuf into an i915 bo and then ask the i915 shrinker to
purge/invalidate its pages. This should establish the lockdep link from
the fs_reclaim shrinker section to whatever locks are used to
acquire/release dmabuf mappings; if any are required ofc.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
---
tests/prime_vgem.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/tests/prime_vgem.c b/tests/prime_vgem.c
index d886044a4..3b3dcc910 100644
--- a/tests/prime_vgem.c
+++ b/tests/prime_vgem.c
@@ -237,6 +237,32 @@ static void test_gtt(int vgem, int i915)
gem_close(vgem, scratch.handle);
}
+static void test_shrink(int vgem, int i915)
+{
+ struct vgem_bo scratch = {
+ .width = 1024,
+ .height = 1024,
+ .bpp = 32
+ };
+ int dmabuf;
+
+ vgem_create(vgem, &scratch);
+
+ dmabuf = prime_handle_to_fd(vgem, scratch.handle);
+ gem_close(vgem, scratch.handle);
+
+ scratch.handle = prime_fd_to_handle(i915, dmabuf);
+ close(dmabuf);
+
+ /* Populate the i915_bo->pages. */
+ gem_set_domain(i915, scratch.handle, I915_GEM_DOMAIN_GTT, 0);
+
+ /* Now evict them, establising the link from i915:shrinker to vgem. */
+ igt_drop_caches_set(i915, DROP_SHRINK_ALL);
+
+ gem_close(i915, scratch.handle);
+}
+
static bool is_coherent(int i915)
{
int val = 1; /* by default, we assume GTT is coherent, hence the test */
@@ -794,6 +820,9 @@ igt_main
igt_subtest("basic-gtt")
test_gtt(vgem, i915);
+ igt_subtest("shrink")
+ test_shrink(vgem, i915);
+
igt_subtest("coherency-gtt")
test_gtt_interleaved(vgem, i915);
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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