[Intel-gfx] [PATCH] igt/gem_partial_pwrite_pread: Add set-cache subtest to validate JIRA VIZ-3721

[armin.c.reese at intel.com]

From: Armin Reese <armin.c.reese at intel.com>

This subtest forces the driver down the code path in i915_gem_object_set_cache_level()
which unbinds VMAs and triggers the kernel panic described in VIZ-3721.  This
test will pass if the bug fix is in place.

Bugzilla:  https://bugs.fredesktop.org/show_bug.cgi?id=76384
Signed-off-by:  Armin Reese <armin.c.reese at intel.com>
---
 tests/gem_partial_pwrite_pread.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tests/gem_partial_pwrite_pread.c b/tests/gem_partial_pwrite_pread.c
index 7945ba7..3e3ecc9 100644
--- a/tests/gem_partial_pwrite_pread.c
+++ b/tests/gem_partial_pwrite_pread.c
@@ -131,6 +131,14 @@ static void test_partial_reads(void)
 
 }
 
+static void test_set_cache(void)
+{
+	igt_info("checking set-cache\n");
+
+	blt_bo_fill(staging_bo, scratch_bo, 0);
+
+}
+
 static void test_partial_writes(void)
 {
 	int i, j;
@@ -244,6 +252,9 @@ static void do_tests(int cache_level, const char *suffix)
 			gem_set_caching(fd, scratch_bo->handle, cache_level);
 	}
 
+	igt_subtest_f("set-cache%s", suffix)
+		test_set_cache();
+
 	igt_subtest_f("reads%s", suffix)
 		test_partial_reads();
 
-- 
1.9.1