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[9/9] drm/i915: Disallow direct CPU access to stolen pages for relocations

Message ID 1470830073-7407-10-git-send-email-chris@chris-wilson.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Chris Wilson Aug. 10, 2016, 11:54 a.m. UTC 
As we cannot access the backing pages behind stolen objects, we should
not attempt to do so for relocations.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index aef7408f7fbd..d12336dac0b0 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -283,6 +283,9 @@  static void eb_destroy(struct eb_vmas *eb)
 
 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 {
+	if (!i915_gem_object_has_struct_page(obj))
+		return false;
+
 	if (DBG_USE_CPU_RELOC)
 		return DBG_USE_CPU_RELOC > 0;