[PATCH] drm/i915: Allow internal page allocations to fail

* [PATCH] drm/i915: Allow internal page allocations to fail
@ 2017-12-15 10:17 Chris Wilson
  2017-12-15 10:51 ` Joonas Lahtinen
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Chris Wilson @ 2017-12-15 10:17 UTC (permalink / raw)
  To: intel-gfx; +Cc: Matthew Auld

Internal objects consistent of scratch pages not subject to the
persistence guarantees of user facing objects. They are used for
example, in ring buffers where they are only required for temporary
storage of commands that will be rewritten every time. As they are
temporary constructs, quietly report -ENOMEM back along the callchain
rather than subject the system to oomkiller if an allocation fails.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
---
 drivers/gpu/drm/i915/i915_gem_internal.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_internal.c b/drivers/gpu/drm/i915/i915_gem_internal.c
index ee83ec838ee7..a1d6956734f7 100644
--- a/drivers/gpu/drm/i915/i915_gem_internal.c
+++ b/drivers/gpu/drm/i915/i915_gem_internal.c
@@ -27,6 +27,7 @@
 #include "i915_drv.h"
 
 #define QUIET (__GFP_NORETRY | __GFP_NOWARN)
+#define MAYFAIL (__GFP_RETRY_MAYFAIL | __GFP_NOWARN)
 
 /* convert swiotlb segment size into sensible units (pages)! */
 #define IO_TLB_SEGPAGES (IO_TLB_SEGSIZE << IO_TLB_SHIFT >> PAGE_SHIFT)
@@ -95,7 +96,8 @@ static int i915_gem_object_get_pages_internal(struct drm_i915_gem_object *obj)
 		struct page *page;
 
 		do {
-			page = alloc_pages(gfp | (order ? QUIET : 0), order);
+			page = alloc_pages(gfp | (order ? QUIET : MAYFAIL),
+					   order);
 			if (page)
 				break;
 			if (!order--)
-- 
2.15.1

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