nouveau: add coherent BO attribute
Add a flag allowing Nouveau to specify that an object should be coherent
at allocation time. This is required for some class of objects like
fences which are randomly-accessed by both the CPU and GPU. This flag
instructs the kernel driver to make sure the object remains coherent
even on architectures for which coherency is not guaranteed by the bus.
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
diff --git a/nouveau/abi16.c b/nouveau/abi16.c
index 538f3a7..4ca0bfb 100644
--- a/nouveau/abi16.c
+++ b/nouveau/abi16.c
@@ -195,6 +195,9 @@
if (bo->flags & NOUVEAU_BO_MAP)
info->domain |= NOUVEAU_GEM_DOMAIN_MAPPABLE;
+ if (bo->flags & NOUVEAU_BO_COHERENT)
+ info->domain |= NOUVEAU_GEM_DOMAIN_COHERENT;
+
if (!(bo->flags & NOUVEAU_BO_CONTIG))
info->tile_flags = NOUVEAU_GEM_TILE_NONCONTIG;
diff --git a/nouveau/nouveau.h b/nouveau/nouveau.h
index a55e2b0..4adda0e 100644
--- a/nouveau/nouveau.h
+++ b/nouveau/nouveau.h
@@ -127,6 +127,7 @@
#define NOUVEAU_BO_MAP 0x80000000
#define NOUVEAU_BO_CONTIG 0x40000000
#define NOUVEAU_BO_NOSNOOP 0x20000000
+#define NOUVEAU_BO_COHERENT 0x10000000
struct nouveau_bo {
struct nouveau_device *device;