[Intel-gfx] [PATCH] drm/i915/selftests: Report ENOMEM clearly for an allocation failure

[Chris Wilson]

If we can not run the drunk_hole test because we couldn't allocate the
memory for the permutation array (even after we tried trimming the
size), report a clear ENOMEM. Similary, if we are asked to operate on a
hole too small for ourselves, make it skip quietly.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 3dcf886a2802..d0ce496606ed 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -705,12 +705,18 @@ static int drunk_hole(struct drm_i915_private *i915,
 		if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
 			hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
 		count = hole_size;
+		if (!count) {
+			pr_debug("%s: hole is too small [%llx - %llx] >> %d: %d\n",
+				 __func__, hole_start, hole_end, size, count);
+			break;
+		}
+
 		do {
 			count >>= 1;
 			order = i915_random_order(count, &prng);
 		} while (!order && count);
 		if (!order)
-			break;
+			return -ENOMEM;
 
 		/* Ignore allocation failures (i.e. don't report them as
 		 * a test failure) as we are purposefully allocating very
-- 
2.15.0