[Intel-gfx] [PATCH v3 11/15] drm/i915/selftests: handle allocation failures

[Matthew Auld]

If we have to contend with non-mappable LMEM, then we need to ensure the
object fits within the mappable portion, like in the selftests, where we
later try to CPU access the pages. However if it can't then we need to
gracefully handle this, without throwing an error.

Also it looks like TTM will return -ENOMEM, in ttm_bo_mem_space() after
exhausting all possible placements.

Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Acked-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/i915/gem/selftests/huge_pages.c      | 2 +-
 drivers/gpu/drm/i915/selftests/intel_memory_region.c | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index 42db9cd30978..3caa178bbd07 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1344,7 +1344,7 @@ static int igt_ppgtt_smoke_huge(void *arg)
 
 		err = i915_gem_object_pin_pages_unlocked(obj);
 		if (err) {
-			if (err == -ENXIO || err == -E2BIG) {
+			if (err == -ENXIO || err == -E2BIG || err == -ENOMEM) {
 				i915_gem_object_put(obj);
 				size >>= 1;
 				goto try_again;
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 56dec9723601..ba32893e0873 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -822,8 +822,14 @@ static int igt_lmem_create_with_ps(void *arg)
 
 		i915_gem_object_lock(obj, NULL);
 		err = i915_gem_object_pin_pages(obj);
-		if (err)
+		if (err) {
+			if (err == -ENXIO || err == -E2BIG || err == -ENOMEM) {
+				pr_info("%s not enough lmem for ps(%u) err=%d\n",
+					__func__, ps, err);
+				err = 0;
+			}
 			goto out_put;
+		}
 
 		daddr = i915_gem_object_get_dma_address(obj, 0);
 		if (!IS_ALIGNED(daddr, ps)) {
-- 
2.34.1