drm/i915: Allow tiling of objects with bit 17 swizzling by the CPU.

Save the bit 17 state of the pages when freeing the page list, and
reswizzle them if necessary when rebinding the pages (in case they were
swapped out).  Since we have userland with expectations that the swizzle
enums let it pread and pwrite contents accurately, we can't expose a new
swizzle enum for bit 17 (which it would have to GTT map to handle), so we
handle it down in pread and pwrite by swizzling the copy when bit 17 of the
page address is set.

Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index efcd610d4fca..bccd4146d55c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -446,6 +446,9 @@ struct drm_i915_gem_object {
         uint32_t tiling_mode;
         uint32_t stride;
 
+        /** Record of address bit 17 of each page at last unbind. */
+        long *bit_17;
+
         /** AGP mapping type (AGP_USER_MEMORY or AGP_USER_CACHED_MEMORY */
         uint32_t agp_type;
 
@@ -640,6 +643,8 @@ void i915_gem_object_put_pages(struct drm_gem_object *obj);
 
 /* i915_gem_tiling.c */
 void i915_gem_detect_bit_6_swizzle(struct drm_device *dev);
+void i915_gem_object_do_bit_17_swizzle(struct drm_gem_object *obj);
+void i915_gem_object_save_bit_17_swizzle(struct drm_gem_object *obj);
 
 /* i915_gem_debug.c */
 void i915_gem_dump_object(struct drm_gem_object *obj, int len,