[Intel-gfx] [PATCH 19/28] drm/i915: Support readback of stolen objects upon error

[Chris Wilson]

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_irq.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 24e1dd2..033f9be 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -827,7 +827,10 @@ i915_error_object_create(struct drm_i915_private *dev_priv,
 	int page, page_count;
 	u32 reloc_offset;
 
-	if (src == NULL || src->pages == NULL)
+	if (src == NULL)
+		return NULL;
+
+	if (src->pages == NULL && !src->stolen)
 		return NULL;
 
 	page_count = src->base.size / PAGE_SIZE;
@@ -859,6 +862,14 @@ i915_error_object_create(struct drm_i915_private *dev_priv,
 						     reloc_offset);
 			memcpy_fromio(d, s, PAGE_SIZE);
 			io_mapping_unmap_atomic(s);
+		} else if (src->stolen) {
+			unsigned long offset;
+
+			offset = dev_priv->mm.stolen_base;
+			offset += src->stolen->start;
+			offset += page << PAGE_SHIFT;
+
+			memcpy_fromio(d, (void *)offset, PAGE_SIZE);
 		} else {
 			void *s;
 
-- 
1.7.10