[igt-dev] [PATCH i-g-t] igt: Force eviction of test bo directly

[Chris Wilson]

Currently we indirectly try to evict the test buffers by mmaping enough
bo that should fill the aperture. However, this assumes that the kernel
is trying to fill the aperture and does not use random replacement
(which it does) or use small partials to avoid mmaping the whole object
(which it does). Rather than assume, use the debugfs interface to force
the eviction of the bound objects.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/gem_caching.c                    | 9 +--------
 tests/gem_partial_pwrite_pread.c       | 9 +--------
 tests/gem_tiled_partial_pwrite_pread.c | 9 +--------
 3 files changed, 3 insertions(+), 24 deletions(-)

diff --git a/tests/gem_caching.c b/tests/gem_caching.c
index 7a9f03aa3..09e1a5f97 100644
--- a/tests/gem_caching.c
+++ b/tests/gem_caching.c
@@ -55,7 +55,6 @@ drm_intel_bo *scratch_bo;
 drm_intel_bo *staging_bo;
 #define BO_SIZE (4*4096)
 uint32_t devid;
-uint64_t mappable_gtt_limit;
 int fd;
 
 static void
@@ -90,9 +89,7 @@ blt_bo_fill(drm_intel_bo *tmp_bo, drm_intel_bo *bo, uint8_t val)
 
 	drm_intel_gem_bo_unmap_gtt(tmp_bo);
 
-	if (bo->offset < mappable_gtt_limit &&
-	    (IS_G33(devid) || intel_gen(devid) >= 4))
-		igt_trash_aperture();
+	igt_drop_caches_set(fd, DROP_BOUND);
 
 	copy_bo(tmp_bo, bo);
 }
@@ -136,9 +133,6 @@ igt_main
 		gem_set_caching(fd, scratch_bo->handle, 1);
 
 		staging_bo = drm_intel_bo_alloc(bufmgr, "staging bo", BO_SIZE, 4096);
-
-		igt_init_aperture_trashers(bufmgr);
-		mappable_gtt_limit = gem_mappable_aperture_size();
 	}
 
 	igt_subtest("reads") {
@@ -278,7 +272,6 @@ igt_main
 	}
 
 	igt_fixture {
-		igt_cleanup_aperture_trashers();
 		drm_intel_bufmgr_destroy(bufmgr);
 
 		close(fd);
diff --git a/tests/gem_partial_pwrite_pread.c b/tests/gem_partial_pwrite_pread.c
index d8cdd2a0a..35e39ad7f 100644
--- a/tests/gem_partial_pwrite_pread.c
+++ b/tests/gem_partial_pwrite_pread.c
@@ -56,7 +56,6 @@ drm_intel_bo *scratch_bo;
 drm_intel_bo *staging_bo;
 #define BO_SIZE (4*4096)
 uint32_t devid;
-uint64_t mappable_gtt_limit;
 int fd;
 
 static void
@@ -91,9 +90,7 @@ blt_bo_fill(drm_intel_bo *tmp_bo, drm_intel_bo *bo, uint8_t val)
 
 	drm_intel_gem_bo_unmap_gtt(tmp_bo);
 
-	if (bo->offset < mappable_gtt_limit &&
-	    (IS_G33(devid) || intel_gen(devid) >= 4))
-		igt_trash_aperture();
+	igt_drop_caches_set(fd, DROP_BOUND);
 
 	copy_bo(tmp_bo, bo);
 }
@@ -264,9 +261,6 @@ igt_main
 		/* overallocate the buffers we're actually using because */
 		scratch_bo = drm_intel_bo_alloc(bufmgr, "scratch bo", BO_SIZE, 4096);
 		staging_bo = drm_intel_bo_alloc(bufmgr, "staging bo", BO_SIZE, 4096);
-
-		igt_init_aperture_trashers(bufmgr);
-		mappable_gtt_limit = gem_mappable_aperture_size();
 	}
 
 	do_tests(-1, "");
@@ -277,7 +271,6 @@ igt_main
 	do_tests(2, "-display");
 
 	igt_fixture {
-		igt_cleanup_aperture_trashers();
 		drm_intel_bufmgr_destroy(bufmgr);
 
 		close(fd);
diff --git a/tests/gem_tiled_partial_pwrite_pread.c b/tests/gem_tiled_partial_pwrite_pread.c
index 0b4972e37..c2f44c9d8 100644
--- a/tests/gem_tiled_partial_pwrite_pread.c
+++ b/tests/gem_tiled_partial_pwrite_pread.c
@@ -61,7 +61,6 @@ drm_intel_bo *tiled_staging_bo;
 unsigned long scratch_pitch;
 #define BO_SIZE (32*4096)
 uint32_t devid;
-uint64_t mappable_gtt_limit;
 int fd;
 
 static void
@@ -112,9 +111,7 @@ blt_bo_fill(drm_intel_bo *tmp_bo, drm_intel_bo *bo, int val)
 
 	drm_intel_gem_bo_unmap_gtt(tmp_bo);
 
-	if (bo->offset < mappable_gtt_limit &&
-	    (IS_G33(devid) || intel_gen(devid) >= 4))
-		igt_trash_aperture();
+	igt_drop_caches_set(fd, DROP_BOUND);
 
 	copy_bo(tmp_bo, 0, bo, 1);
 }
@@ -295,9 +292,6 @@ igt_main
 							    BO_SIZE/4096, 4,
 							    &tiling_mode,
 							    &scratch_pitch, 0);
-
-		igt_init_aperture_trashers(bufmgr);
-		mappable_gtt_limit = gem_mappable_aperture_size();
 	}
 
 	igt_subtest("reads")
@@ -310,7 +304,6 @@ igt_main
 		test_partial_read_writes();
 
 	igt_fixture {
-		igt_cleanup_aperture_trashers();
 		drm_intel_bufmgr_destroy(bufmgr);
 
 		close(fd);
-- 
2.18.0