[igt-dev] [PATCH i-g-t 2/3] tests/i915/kms_mmap_write_crc: handle missing gem_get_caching()

[Matthew Auld]

The kernel is meant to force the caching level for the object to
CACHE_NONE or CACHE_WT when first scanning out the object, since the
display engine is not coherent (assuming userspace hasn't already done
this). On discrete we no longer support set/get_caching, but we can only
do the scanout from lmem, which can only be mapped as WC and so should
always be coherent for scanout. Adjust the test and ensure it still
passes as expected.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5303
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
---
 tests/i915/kms_mmap_write_crc.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/tests/i915/kms_mmap_write_crc.c b/tests/i915/kms_mmap_write_crc.c
index b17e5fdb..da7312d6 100644
--- a/tests/i915/kms_mmap_write_crc.c
+++ b/tests/i915/kms_mmap_write_crc.c
@@ -78,7 +78,6 @@ static void test(data_t *data)
 	drmModeModeInfo *mode;
 	cairo_t *cr;
 	char *ptr;
-	uint32_t caching;
 	void *buf;
 	igt_crc_t crc;
 
@@ -102,9 +101,13 @@ static void test(data_t *data)
 	igt_plane_set_fb(data->primary, &data->fb[0]);
 	igt_display_commit(display);
 
-	/* make sure caching mode has become UC/WT */
-	caching = gem_get_caching(data->drm_fd, fb->gem_handle);
-	igt_assert(caching == I915_CACHING_NONE || caching == I915_CACHING_DISPLAY);
+	if (!gem_has_lmem(data->drm_fd)) {
+		uint32_t caching;
+
+		/* make sure caching mode has become UC/WT */
+		caching = gem_get_caching(data->drm_fd, fb->gem_handle);
+		igt_assert(caching == I915_CACHING_NONE || caching == I915_CACHING_DISPLAY);
+	}
 
 	/*
 	 * firstly demonstrate the need for DMA_BUF_SYNC_START ("begin_cpu_access")
-- 
2.36.1