[igt-dev] [RFC PATCH i-g-t v3 4/4] tests/gem_ctx_shared: Calculate object attributs from actual page size

[Janusz Krzysztofik]

exec-shared-gtt-* subtests use hardcoded values for object size and
softpin offset, based on 4kB page size assumption.  That may result in
those subtests failing when run on future backing stores with possibly
larger minimum page sizes.

Replace hardcoded constants with values derived from minimum page size
of actual backing store the test is running on.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/i915/gem_ctx_shared.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/i915/gem_ctx_shared.c b/tests/i915/gem_ctx_shared.c
index f7852482..d386de65 100644
--- a/tests/i915/gem_ctx_shared.c
+++ b/tests/i915/gem_ctx_shared.c
@@ -195,6 +195,7 @@ static void exec_shared_gtt(int i915, unsigned int ring)
 	uint32_t scratch, *s;
 	uint32_t batch, cs[16];
 	uint64_t offset;
+	uint64_t page_size;
 	int i;
 
 	gem_require_ring(i915, ring);
@@ -203,7 +204,8 @@ static void exec_shared_gtt(int i915, unsigned int ring)
 	clone = gem_context_clone(i915, 0, I915_CONTEXT_CLONE_VM, 0);
 
 	/* Find a hole big enough for both objects later */
-	scratch = gem_create(i915, 16384);
+	page_size = 1ull << gem_min_page_size_order(i915);
+	scratch = gem_create(i915, 4 * page_size);
 	gem_write(i915, scratch, 0, &bbe, sizeof(bbe));
 	obj.handle = scratch;
 	gem_execbuf(i915, &execbuf);
@@ -246,7 +248,7 @@ static void exec_shared_gtt(int i915, unsigned int ring)
 	gem_write(i915, batch, 0, cs, sizeof(cs));
 
 	obj.handle = batch;
-	obj.offset += 8192; /* make sure we don't cause an eviction! */
+	obj.offset += 2 * page_size; /* make sure we don't cause an eviction! */
 	execbuf.rsvd1 = clone;
 	if (gen > 3 && gen < 6)
 		execbuf.flags |= I915_EXEC_SECURE;
-- 
2.21.0