drm/nouveau/imem: allow bar2 mapping of user allocations

Will be used to init client-allocated USERD to default values.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

3 files changed, 35 insertions, 5 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/base.c
index cd8163a52bb6..e0e4f97be029 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/base.c
@@ -90,6 +90,18 @@ nvkm_instobj_ctor(const struct nvkm_memory_func *func,
 }
 
 int
+nvkm_instobj_wrap(struct nvkm_device *device,
+		  struct nvkm_memory *memory, struct nvkm_memory **pmemory)
+{
+	struct nvkm_instmem *imem = device->imem;
+
+	if (!imem->func->memory_wrap)
+		return -ENOSYS;
+
+	return imem->func->memory_wrap(imem, memory, pmemory);
+}
+
+int
 nvkm_instobj_new(struct nvkm_instmem *imem, u32 size, u32 align, bool zero,
 		 struct nvkm_memory **pmemory)
 {
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
index c51bac76174c..4b2d7465d22f 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
@@ -348,13 +348,11 @@ nv50_instobj_func = {
 };
 
 static int
-nv50_instobj_new(struct nvkm_instmem *base, u32 size, u32 align, bool zero,
-		 struct nvkm_memory **pmemory)
+nv50_instobj_wrap(struct nvkm_instmem *base,
+		  struct nvkm_memory *memory, struct nvkm_memory **pmemory)
 {
 	struct nv50_instmem *imem = nv50_instmem(base);
 	struct nv50_instobj *iobj;
-	struct nvkm_device *device = imem->base.subdev.device;
-	u8 page = max(order_base_2(align), 12);
 
 	if (!(iobj = kzalloc(sizeof(*iobj), GFP_KERNEL)))
 		return -ENOMEM;
@@ -365,7 +363,25 @@ nv50_instobj_new(struct nvkm_instmem *base, u32 size, u32 align, bool zero,
 	refcount_set(&iobj->maps, 0);
 	INIT_LIST_HEAD(&iobj->lru);
 
-	return nvkm_ram_get(device, 0, 1, page, size, true, true, &iobj->ram);
+	iobj->ram = nvkm_memory_ref(memory);
+	return 0;
+}
+
+static int
+nv50_instobj_new(struct nvkm_instmem *imem, u32 size, u32 align, bool zero,
+		 struct nvkm_memory **pmemory)
+{
+	u8 page = max(order_base_2(align), 12);
+	struct nvkm_memory *ram;
+	int ret;
+
+	ret = nvkm_ram_get(imem->subdev.device, 0, 1, page, size, true, true, &ram);
+	if (ret)
+		return ret;
+
+	ret = nv50_instobj_wrap(imem, ram, pmemory);
+	nvkm_memory_unref(&ram);
+	return ret;
 }
 
 /******************************************************************************
@@ -382,6 +398,7 @@ static const struct nvkm_instmem_func
 nv50_instmem = {
 	.fini = nv50_instmem_fini,
 	.memory_new = nv50_instobj_new,
+	.memory_wrap = nv50_instobj_wrap,
 	.zero = false,
 };
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/priv.h
index 56c15e30a5dd..fe92986a3885 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/priv.h
@@ -12,6 +12,7 @@ struct nvkm_instmem_func {
 	void (*wr32)(struct nvkm_instmem *, u32 addr, u32 data);
 	int (*memory_new)(struct nvkm_instmem *, u32 size, u32 align,
 			  bool zero, struct nvkm_memory **);
+	int (*memory_wrap)(struct nvkm_instmem *, struct nvkm_memory *, struct nvkm_memory **);
 	bool zero;
 };