Am 09.09.2020 07:29 schrieb Huacai Chen <chenhc@xxxxxxxxxx>:
Though RADEON_GEM_GTT_WC is initially used for GTT, but this flag is
bound to drm_arch_can_wc_memory(), and if arch doesn't support WC, then
VRAM should not use WC.
NAK, If System memory supports WC is completely independent from the VRAM BAR.
Christian.
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_object.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index f3dee01..07b82d9 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -117,10 +117,16 @@ void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
TTM_PL_FLAG_VRAM;
}
- rbo->placements[c].fpfn = 0;
- rbo->placements[c++].flags = TTM_PL_FLAG_WC |
- TTM_PL_FLAG_UNCACHED |
- TTM_PL_FLAG_VRAM;
+ if (rbo->flags & RADEON_GEM_GTT_WC) {
+ rbo->placements[c].fpfn = 0;
+ rbo->placements[c++].flags = TTM_PL_FLAG_WC |
+ TTM_PL_FLAG_UNCACHED |
+ TTM_PL_FLAG_VRAM;
+ } else {
+ rbo->placements[c].fpfn = 0;
+ rbo->placements[c++].flags = TTM_PL_FLAG_UNCACHED |
+ TTM_PL_FLAG_VRAM;
+ }
}
if (domain & RADEON_GEM_DOMAIN_GTT) {
--
2.7.0
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