Today, most callers of ttm_io_prot() check TTM_PL_FLAG_CACHED before
calling it since on some archs it will unconditionally create non-cached
mappings.
But not all callers do which is incorrect as far as I can tell.
Instead, move that check inside ttm_io_port() itself for all archs
and make powerpc use the same implementation as ia64 and arm
Signed-off-by: Benjamin Herrenschmidt <benh at palm4.ozlabs.ibm.com>
---
drivers/gpu/drm/ttm/ttm_bo_util.c | 19 ++++++++-----------
drivers/gpu/drm/ttm/ttm_bo_vm.c | 5 ++---
2 files changed, 10 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c
b/drivers/gpu/drm/ttm/ttm_bo_util.c
index e31d48c..ef2ac3c 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -487,28 +487,27 @@ static int ttm_buffer_object_transfer(struct
ttm_buffer_object *bo,
pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
{
+ /* Cached mappings need no adjustment */
+ if (caching_flags & TTM_PL_FLAG_CACHED)
+ return tmp;
+
#if defined(__i386__) || defined(__x86_64__)
if (caching_flags & TTM_PL_FLAG_WC)
tmp = pgprot_writecombine(tmp);
else if (boot_cpu_data.x86 > 3)
tmp = pgprot_noncached(tmp);
-#elif defined(__powerpc__)
- if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
- pgprot_val(tmp) |= _PAGE_NO_CACHE;
- if (caching_flags & TTM_PL_FLAG_UNCACHED)
- pgprot_val(tmp) |= _PAGE_GUARDED;
+#endif
}
#endif
-#if defined(__ia64__) || defined(__arm__)
+#if defined(__ia64__) || defined(__arm__) || defined(__powerpc__)
if (caching_flags & TTM_PL_FLAG_WC)
tmp = pgprot_writecombine(tmp);
else
tmp = pgprot_noncached(tmp);
#endif
#if defined(__sparc__) || defined(__mips__)
- if (!(caching_flags & TTM_PL_FLAG_CACHED))
- tmp = pgprot_noncached(tmp);
+ tmp = pgprot_noncached(tmp);
#endif
return tmp;
}
@@ -567,9 +566,7 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
* We need to use vmap to get the desired page protection
* or to make the buffer object look contiguous.
*/
- prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
- PAGE_KERNEL :
- ttm_io_prot(mem->placement, PAGE_KERNEL);
+ prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
map->bo_kmap_type = ttm_bo_map_vmap;
map->virtual = vmap(ttm->pages + start_page, num_pages,
0, prot);
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 0ce48e5..4ce8dc1 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -200,9 +200,8 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma,
struct vm_fault *vmf)
cvma.vm_page_prot);
} else {
ttm = bo->ttm;
- if (!(bo->mem.placement & TTM_PL_FLAG_CACHED))
- cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
- cvma.vm_page_prot);
+ cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
+ cvma.vm_page_prot);
/* Allocate all page at once, most common usage */
if (ttm->bdev->driver->ttm_tt_populate(ttm)) {
