drm/nouveau: remove master

The only remaining nouveau_drm.master struct member that's being used is
the mutex that protects its object tree.  Move that into nouveau_drm and
remove nouveau_drm.master entirely.

A pending series to remove the "ioctl" layer between DRM and NVKM also
removes the need for object handle lookups, and hence this mutex, but
it's still required for the moment.
Signed-off-by: Ben Skeggs <bskeggs@nvidia.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240726043828.58966-35-bskeggs@nvidia.com

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -208,11 +208,9 @@ nouveau_cli_fini(struct nouveau_cli *cli)
 	nvif_mmu_dtor(&cli->mmu);
 	cli->device.object.map.ptr = NULL;
 	nvif_device_dtor(&cli->device);
-	if (cli != &cli->drm->master) {
-		mutex_lock(&cli->drm->master.lock);
-		nvif_client_dtor(&cli->base);
-		mutex_unlock(&cli->drm->master.lock);
-	}
+	mutex_lock(&cli->drm->client_mutex);
+	nvif_client_dtor(&cli->base);
+	mutex_unlock(&cli->drm->client_mutex);
 }
 
 static int
@@ -245,11 +243,9 @@ nouveau_cli_init(struct nouveau_drm *drm, const char *sname,
 	INIT_LIST_HEAD(&cli->worker);
 	mutex_init(&cli->lock);
 
-	if (cli != &drm->master) {
-		mutex_lock(&drm->master.lock);
-		ret = nvif_client_ctor(&drm->master.base, cli->name, &cli->base);
-		mutex_unlock(&drm->master.lock);
-	}
+	mutex_lock(&drm->client_mutex);
+	ret = nvif_client_ctor(&drm->_client, cli->name, &cli->base);
+	mutex_unlock(&drm->client_mutex);
 	if (ret) {
 		NV_PRINTK(err, cli, "Client allocation failed: %d\n", ret);
 		goto done;
@@ -602,7 +598,6 @@ nouveau_drm_device_fini(struct nouveau_drm *drm)
 	mutex_unlock(&drm->clients_lock);
 
 	nouveau_cli_fini(&drm->client);
-	nouveau_cli_fini(&drm->master);
 	destroy_workqueue(drm->sched_wq);
 	mutex_destroy(&drm->clients_lock);
 }
@@ -618,13 +613,9 @@ nouveau_drm_device_init(struct nouveau_drm *drm)
 	if (!drm->sched_wq)
 		return -ENOMEM;
 
-	ret = nouveau_cli_init(drm, "DRM-master", &drm->master);
-	if (ret)
-		goto fail_wq;
-
 	ret = nouveau_cli_init(drm, "DRM", &drm->client);
 	if (ret)
-		goto fail_master;
+		goto fail_wq;
 
 	INIT_LIST_HEAD(&drm->clients);
 	mutex_init(&drm->clients_lock);
@@ -691,8 +682,6 @@ nouveau_drm_device_init(struct nouveau_drm *drm)
 fail_ttm:
 	nouveau_vga_fini(drm);
 	nouveau_cli_fini(&drm->client);
-fail_master:
-	nouveau_cli_fini(&drm->master);
 fail_wq:
 	destroy_workqueue(drm->sched_wq);
 	return ret;
@@ -706,9 +695,10 @@ nouveau_drm_device_del(struct nouveau_drm *drm)
 
 	nvif_mmu_dtor(&drm->mmu);
 	nvif_device_dtor(&drm->device);
-	nvif_client_dtor(&drm->master.base);
+	nvif_client_dtor(&drm->_client);
 	nvif_parent_dtor(&drm->parent);
 
+	mutex_destroy(&drm->client_mutex);
 	kfree(drm);
 }
 
@@ -742,14 +732,15 @@ nouveau_drm_device_new(const struct drm_driver *drm_driver, struct device *paren
 	dev_set_drvdata(parent, drm);
 
 	nvif_parent_ctor(&nouveau_parent, &drm->parent);
-	drm->master.base.object.parent = &drm->parent;
+	mutex_init(&drm->client_mutex);
+	drm->_client.object.parent = &drm->parent;
 
 	ret = nvif_driver_init(NULL, nouveau_config, nouveau_debug, "drm",
-			       nouveau_name(drm->dev), &drm->master.base);
+			       nouveau_name(drm->dev), &drm->_client);
 	if (ret)
 		goto done;
 
-	ret = nvif_device_ctor(&drm->master.base, "drmDevice", &drm->device);
+	ret = nvif_device_ctor(&drm->_client, "drmDevice", &drm->device);
 	if (ret) {
 		NV_ERROR(drm, "Device allocation failed: %d\n", ret);
 		goto done;
@@ -966,7 +957,7 @@ nouveau_do_suspend(struct nouveau_drm *drm, bool runtime)
 	}
 
 	NV_DEBUG(drm, "suspending object tree...\n");
-	ret = nvif_client_suspend(&drm->master.base);
+	ret = nvif_client_suspend(&drm->_client);
 	if (ret)
 		goto fail_client;
 
@@ -991,7 +982,7 @@ nouveau_do_resume(struct nouveau_drm *drm, bool runtime)
 	int ret = 0;
 
 	NV_DEBUG(drm, "resuming object tree...\n");
-	ret = nvif_client_resume(&drm->master.base);
+	ret = nvif_client_resume(&drm->_client);
 	if (ret) {
 		NV_ERROR(drm, "Client resume failed with error: %d\n", ret);
 		return ret;

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -203,10 +203,11 @@ u_memcpya(uint64_t user, unsigned int nmemb, unsigned int size)
 struct nouveau_drm {
 	struct nvkm_device *nvkm;
 	struct nvif_parent parent;
+	struct mutex client_mutex;
+	struct nvif_client _client;
 	struct nvif_device device;
 	struct nvif_mmu mmu;
 
-	struct nouveau_cli master;
 	struct nouveau_cli client;
 	struct drm_device *dev;
 

drivers/gpu/drm/nouveau/nouveau_mem.c

@@ -80,9 +80,9 @@ nouveau_mem_fini(struct nouveau_mem *mem)
 {
 	nvif_vmm_put(&mem->drm->client.vmm.vmm, &mem->vma[1]);
 	nvif_vmm_put(&mem->drm->client.vmm.vmm, &mem->vma[0]);
-	mutex_lock(&mem->drm->master.lock);
+	mutex_lock(&mem->drm->client_mutex);
 	nvif_mem_dtor(&mem->mem);
-	mutex_unlock(&mem->drm->master.lock);
+	mutex_unlock(&mem->drm->client_mutex);
 }
 
 int
@@ -113,11 +113,11 @@ nouveau_mem_host(struct ttm_resource *reg, struct ttm_tt *tt)
 	else
 		args.dma = tt->dma_address;
 
-	mutex_lock(&drm->master.lock);
+	mutex_lock(&drm->client_mutex);
 	ret = nvif_mem_ctor_type(mmu, "ttmHostMem", mmu->mem, type, PAGE_SHIFT,
 				 reg->size,
 				 &args, sizeof(args), &mem->mem);
-	mutex_unlock(&drm->master.lock);
+	mutex_unlock(&drm->client_mutex);
 	return ret;
 }
 
@@ -130,7 +130,7 @@ nouveau_mem_vram(struct ttm_resource *reg, bool contig, u8 page)
 	u64 size = ALIGN(reg->size, 1 << page);
 	int ret;
 
-	mutex_lock(&drm->master.lock);
+	mutex_lock(&drm->client_mutex);
 	switch (mmu->mem) {
 	case NVIF_CLASS_MEM_GF100:
 		ret = nvif_mem_ctor_type(mmu, "ttmVram", mmu->mem,
@@ -154,7 +154,7 @@ nouveau_mem_vram(struct ttm_resource *reg, bool contig, u8 page)
 		WARN_ON(1);
 		break;
 	}
-	mutex_unlock(&drm->master.lock);
+	mutex_unlock(&drm->client_mutex);
 
 	reg->start = mem->mem.addr >> PAGE_SHIFT;
 	return ret;