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drm/ttm: Clean usage of ttm_io_prot() with TTM_PL_FLAG_CACHED

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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@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Benjamin Herrenschmidt 2014-09-04 17:47:23 +10:00 committed by Dave Airlie
parent 6bd3110ce6
commit 94318d50ff
2 changed files with 9 additions and 16 deletions
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20
drivers/gpu/drm/ttm/ttm_bo_util.c
View File

@ -480,28 +480,24 @@ 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
#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;
}
@ -560,9 +556,7 @@ 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);

5
drivers/gpu/drm/ttm/ttm_bo_vm.c
View File

@ -197,9 +197,8 @@ 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)) {