In order to accommodate objects that are not backed by struct pages, but
instead point into a contiguous region of stolen space, we need to make
various changes to avoid dereferencing obj->pages or obj->base.filp.
First introduce a marker for the stolen object, that specifies its
offset into the stolen region and implies that it has no backing pages.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 ++
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 2 +-
3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 1e12c72..3a1cbe2 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -140,6 +140,8 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object
*obj)
if (obj->gtt_space != NULL)
seq_printf(m, " (gtt offset: %08x, size: %08x)",
obj->gtt_offset, (unsigned int)obj->gtt_space->size);
+ if (obj->stolen)
+ seq_printf(m, " (stolen: %08lx)", obj->stolen->start);
if (obj->pin_mappable || obj->fault_mappable) {
char s[3], *t = s;
if (obj->pin_mappable)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f1dcca2..8850b19 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -834,6 +834,8 @@ struct drm_i915_gem_object {
/** Current space allocated to this object in the GTT, if any. */
struct drm_mm_node *gtt_space;
+ /** Stolen memory for this object, instead of being backed by shmem. */
+ struct drm_mm_node *stolen;
struct list_head gtt_list;
/** This object's place on the active/flushing/inactive lists */
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6d7e312..a0b6375 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1523,7 +1523,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object
*obj)
struct page *page;
gfp_t gfp;
- if (obj->pages)
+ if (obj->pages || obj->stolen)
return 0;
if (obj->madv != I915_MADV_WILLNEED)
--
1.7.10
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