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drm/i915: Allow objects to be created with no backing pages, but stolen space

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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 <chris@chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-11-15 11:32:21 +00:00 committed by Daniel Vetter
parent 11be49eb4d
commit c1ad11fce8
2 changed files with 4 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_debugfs.c
View file

@ -124,6 +124,8 @@ 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)

2
drivers/gpu/drm/i915/i915_drv.h
View file

@ -962,6 +962,8 @@ 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/inactive lists */