drm/nouveau: add nvif_mmu to nouveau_drm

This allocates a new nvif_mmu in nouveau_drm, and uses it for TTM
backend memory allocations instead of nouveau_drm.master.mmu,
which is removed by a later commit that removes nouveau_drm.master
entirely.
Signed-off-by: Ben Skeggs <bskeggs@nvidia.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240726043828.58966-29-bskeggs@nvidia.com

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -227,13 +227,6 @@ nouveau_cli_init(struct nouveau_drm *drm, const char *sname,
 		{}
 	};
 	static const struct nvif_mclass
-	mmus[] = {
-		{ NVIF_CLASS_MMU_GF100, -1 },
-		{ NVIF_CLASS_MMU_NV50 , -1 },
-		{ NVIF_CLASS_MMU_NV04 , -1 },
-		{}
-	};
-	static const struct nvif_mclass
 	vmms[] = {
 		{ NVIF_CLASS_VMM_GP100, -1 },
 		{ NVIF_CLASS_VMM_GM200, -1 },
@@ -270,13 +263,7 @@ nouveau_cli_init(struct nouveau_drm *drm, const char *sname,
 
 	cli->device.object.map.ptr = drm->device.object.map.ptr;
 
-	ret = nvif_mclass(&cli->device.object, mmus);
-	if (ret < 0) {
-		NV_PRINTK(err, cli, "No supported MMU class\n");
-		goto done;
-	}
-
-	ret = nvif_mmu_ctor(&cli->device.object, "drmMmu", mmus[ret].oclass,
+	ret = nvif_mmu_ctor(&cli->device.object, "drmMmu", drm->mmu.object.oclass,
 			    &cli->mmu);
 	if (ret) {
 		NV_PRINTK(err, cli, "MMU allocation failed: %d\n", ret);
@@ -717,6 +704,7 @@ nouveau_drm_device_del(struct nouveau_drm *drm)
 	if (drm->dev)
 		drm_dev_put(drm->dev);
 
+	nvif_mmu_dtor(&drm->mmu);
 	nvif_device_dtor(&drm->device);
 	nvif_client_dtor(&drm->master.base);
 	nvif_parent_dtor(&drm->parent);
@@ -728,6 +716,13 @@ static struct nouveau_drm *
 nouveau_drm_device_new(const struct drm_driver *drm_driver, struct device *parent,
 		       struct nvkm_device *device)
 {
+	static const struct nvif_mclass
+	mmus[] = {
+		{ NVIF_CLASS_MMU_GF100, -1 },
+		{ NVIF_CLASS_MMU_NV50 , -1 },
+		{ NVIF_CLASS_MMU_NV04 , -1 },
+		{}
+	};
 	struct nouveau_drm *drm;
 	int ret;
 
@@ -766,6 +761,18 @@ nouveau_drm_device_new(const struct drm_driver *drm_driver, struct device *paren
 		goto done;
 	}
 
+	ret = nvif_mclass(&drm->device.object, mmus);
+	if (ret < 0) {
+		NV_ERROR(drm, "No supported MMU class\n");
+		goto done;
+	}
+
+	ret = nvif_mmu_ctor(&drm->device.object, "drmMmu", mmus[ret].oclass, &drm->mmu);
+	if (ret) {
+		NV_ERROR(drm, "MMU allocation failed: %d\n", ret);
+		goto done;
+	}
+
 done:
 	if (ret) {
 		nouveau_drm_device_del(drm);

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -204,6 +204,7 @@ struct nouveau_drm {
 	struct nvkm_device *nvkm;
 	struct nvif_parent parent;
 	struct nvif_device device;
+	struct nvif_mmu mmu;
 
 	struct nouveau_cli master;
 	struct nouveau_cli client;

drivers/gpu/drm/nouveau/nouveau_mem.c

@@ -91,7 +91,7 @@ nouveau_mem_host(struct ttm_resource *reg, struct ttm_tt *tt)
 	struct nouveau_mem *mem = nouveau_mem(reg);
 	struct nouveau_cli *cli = mem->cli;
 	struct nouveau_drm *drm = cli->drm;
-	struct nvif_mmu *mmu = &cli->mmu;
+	struct nvif_mmu *mmu = &drm->mmu;
 	struct nvif_mem_ram_v0 args = {};
 	u8 type;
 	int ret;
@@ -115,7 +115,7 @@ nouveau_mem_host(struct ttm_resource *reg, struct ttm_tt *tt)
 		args.dma = tt->dma_address;
 
 	mutex_lock(&drm->master.lock);
-	ret = nvif_mem_ctor_type(mmu, "ttmHostMem", cli->mem->oclass, type, PAGE_SHIFT,
+	ret = nvif_mem_ctor_type(mmu, "ttmHostMem", mmu->mem, type, PAGE_SHIFT,
 				 reg->size,
 				 &args, sizeof(args), &mem->mem);
 	mutex_unlock(&drm->master.lock);
@@ -128,14 +128,14 @@ nouveau_mem_vram(struct ttm_resource *reg, bool contig, u8 page)
 	struct nouveau_mem *mem = nouveau_mem(reg);
 	struct nouveau_cli *cli = mem->cli;
 	struct nouveau_drm *drm = cli->drm;
-	struct nvif_mmu *mmu = &cli->mmu;
+	struct nvif_mmu *mmu = &drm->mmu;
 	u64 size = ALIGN(reg->size, 1 << page);
 	int ret;
 
 	mutex_lock(&drm->master.lock);
-	switch (cli->mem->oclass) {
+	switch (mmu->mem) {
 	case NVIF_CLASS_MEM_GF100:
-		ret = nvif_mem_ctor_type(mmu, "ttmVram", cli->mem->oclass,
+		ret = nvif_mem_ctor_type(mmu, "ttmVram", mmu->mem,
 					 drm->ttm.type_vram, page, size,
 					 &(struct gf100_mem_v0) {
 						.contig = contig,
@@ -143,7 +143,7 @@ nouveau_mem_vram(struct ttm_resource *reg, bool contig, u8 page)
 					 &mem->mem);
 		break;
 	case NVIF_CLASS_MEM_NV50:
-		ret = nvif_mem_ctor_type(mmu, "ttmVram", cli->mem->oclass,
+		ret = nvif_mem_ctor_type(mmu, "ttmVram", mmu->mem,
 					 drm->ttm.type_vram, page, size,
 					 &(struct nv50_mem_v0) {
 						.bankswz = mmu->kind[mem->kind] == 2,