From: Chris Wilson Date: Thu, 15 Nov 2012 11:32:21 +0000 (+0000) Subject: drm/i915: Allow objects to be created with no backing pages, but stolen space X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c1ad11fce86405c955873974f58ab305d894be78;p=linux-beck.git drm/i915: Allow objects to be created with no backing pages, but stolen space 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 Reviewed-by: Ben Widawsky Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 62619e39533f..58e667687741 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -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) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 6969c722edf6..1646d036db09 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -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 */