drm: Update drm_addmap and drm_mmap to use PAT WC instead of MTRRs
Previously, DRM_FRAME_BUFFER mappings, as well as DRM_REGISTERS
mappings with DRM_WRITE_COMBINING set, resulted in an unconditional
MTRR being added but the actual mappings being created as UC-.
Now these mappings have the MTRR added only if needed, but they will
be mapped with pgprot_writecombine.
The non-WC DRM_REGISTERS case now uses pgprot_noncached instead of
hardcoding the bit twiddling.
The DRM_AGP case is unchanged for now.
[airlied: fix ppc build]
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index 0128147..0190fce 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -210,12 +210,16 @@
if (drm_core_has_MTRR(dev)) {
if (map->type == _DRM_FRAME_BUFFER ||
(map->flags & _DRM_WRITE_COMBINING)) {
- map->mtrr = mtrr_add(map->offset, map->size,
- MTRR_TYPE_WRCOMB, 1);
+ map->mtrr =
+ arch_phys_wc_add(map->offset, map->size);
}
}
if (map->type == _DRM_REGISTERS) {
- map->handle = ioremap(map->offset, map->size);
+ if (map->flags & _DRM_WRITE_COMBINING)
+ map->handle = ioremap_wc(map->offset,
+ map->size);
+ else
+ map->handle = ioremap(map->offset, map->size);
if (!map->handle) {
kfree(map);
return -ENOMEM;
@@ -451,11 +455,8 @@
iounmap(map->handle);
/* FALLTHROUGH */
case _DRM_FRAME_BUFFER:
- if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
- int retcode;
- retcode = mtrr_del(map->mtrr, map->offset, map->size);
- DRM_DEBUG("mtrr_del=%d\n", retcode);
- }
+ if (drm_core_has_MTRR(dev))
+ arch_phys_wc_del(map->mtrr);
break;
case _DRM_SHM:
vfree(map->handle);
