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/include/drm/nouveau_drm.h b/include/drm/nouveau_drm.h
index b18cad0..87aefc5 100644
--- a/include/drm/nouveau_drm.h
+++ b/include/drm/nouveau_drm.h
@@ -96,6 +96,7 @@
#define NOUVEAU_GEM_DOMAIN_VRAM (1 << 1)
#define NOUVEAU_GEM_DOMAIN_GART (1 << 2)
#define NOUVEAU_GEM_DOMAIN_MAPPABLE (1 << 3)
+#define NOUVEAU_GEM_DOMAIN_COHERENT (1 << 4)
#define NOUVEAU_GEM_TILE_LAYOUT_MASK 0x0000ff00
#define NOUVEAU_GEM_TILE_16BPP 0x00000001
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;