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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-09-04 17:47:23 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2014-09-23 15:00:26 +1000 |
| commit | 94318d50ffc84a1ebaf1a83a0a56bbbaf415bacf (patch) | |
| tree | 33615cd5feabb051b2f8f54614a297d8e4ccd2af | |
| parent | 6bd3110ce6e50fb15c975b26f068d606f4434431 (diff) | |
| download | op-kernel-dev-94318d50ffc84a1ebaf1a83a0a56bbbaf415bacf.zip op-kernel-dev-94318d50ffc84a1ebaf1a83a0a56bbbaf415bacf.tar.gz | |
drm/ttm: Clean usage of ttm_io_prot() with TTM_PL_FLAG_CACHED
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>
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo_util.c | 20 | ||||
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo_vm.c | 5 |
2 files changed, 9 insertions, 16 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index 824af90..882cccd 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -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); diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index d05437f..8fb7213 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -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)) { |
