[PATCH drm-misc-next v4 4/8] drm/gpuvm: add common dma-resv per struct drm_gpuvm

[Danilo Krummrich <dakr@xxxxxxxxxx>]

Provide a common dma-resv for GEM objects not being used outside of this
GPU-VM. This is used in a subsequent patch to generalize dma-resv,
external and evicted object handling and GEM validation.

Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
---
 drivers/gpu/drm/drm_gpuvm.c            |  9 +++++++--
 drivers/gpu/drm/nouveau/nouveau_uvmm.c |  2 +-
 include/drm/drm_gpuvm.h                | 17 ++++++++++++++++-
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
index bfea4a8a19ec..cbf4b738a16c 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -655,6 +655,7 @@ drm_gpuva_range_valid(struct drm_gpuvm *gpuvm,
 /**
  * drm_gpuvm_init() - initialize a &drm_gpuvm
  * @gpuvm: pointer to the &drm_gpuvm to initialize
+ * @drm: the drivers &drm_device
  * @name: the name of the GPU VA space
  * @start_offset: the start offset of the GPU VA space
  * @range: the size of the GPU VA space
@@ -668,7 +669,7 @@ drm_gpuva_range_valid(struct drm_gpuvm *gpuvm,
  * &name is expected to be managed by the surrounding driver structures.
  */
 void
-drm_gpuvm_init(struct drm_gpuvm *gpuvm,
+drm_gpuvm_init(struct drm_gpuvm *gpuvm, struct drm_device *drm,
 	       const char *name,
 	       u64 start_offset, u64 range,
 	       u64 reserve_offset, u64 reserve_range,
@@ -694,6 +695,8 @@ drm_gpuvm_init(struct drm_gpuvm *gpuvm,
 						     reserve_range)))
 			__drm_gpuva_insert(gpuvm, &gpuvm->kernel_alloc_node);
 	}
+
+	drm_gem_private_object_init(drm, &gpuvm->d_obj, 0);
 }
 EXPORT_SYMBOL_GPL(drm_gpuvm_init);
 
@@ -713,7 +716,9 @@ drm_gpuvm_destroy(struct drm_gpuvm *gpuvm)
 		__drm_gpuva_remove(&gpuvm->kernel_alloc_node);
 
 	WARN(!RB_EMPTY_ROOT(&gpuvm->rb.tree.rb_root),
-	     "GPUVA tree is not empty, potentially leaking memory.");
+	     "GPUVA tree is not empty, potentially leaking memory.\n");
+
+	drm_gem_private_object_fini(&gpuvm->d_obj);
 }
 EXPORT_SYMBOL_GPL(drm_gpuvm_destroy);
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.c b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
index 6c86b64273c3..a80ac8767843 100644
--- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
@@ -1836,7 +1836,7 @@ nouveau_uvmm_init(struct nouveau_uvmm *uvmm, struct nouveau_cli *cli,
 	uvmm->kernel_managed_addr = kernel_managed_addr;
 	uvmm->kernel_managed_size = kernel_managed_size;
 
-	drm_gpuvm_init(&uvmm->base, cli->name,
+	drm_gpuvm_init(&uvmm->base, cli->drm->dev, cli->name,
 		       NOUVEAU_VA_SPACE_START,
 		       NOUVEAU_VA_SPACE_END,
 		       kernel_managed_addr, kernel_managed_size,
diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index 0e802676e0a9..6666c07d7c3e 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -240,14 +240,29 @@ struct drm_gpuvm {
 	 * @ops: &drm_gpuvm_ops providing the split/merge steps to drivers
 	 */
 	const struct drm_gpuvm_ops *ops;
+
+	/**
+	 * @d_obj: Dummy GEM object; used internally to pass the GPU VMs
+	 * dma-resv to &drm_exec. Provides the GPUVM's &dma-resv.
+	 */
+	struct drm_gem_object d_obj;
 };
 
-void drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
+void drm_gpuvm_init(struct drm_gpuvm *gpuvm, struct drm_device *drm,
+		    const char *name,
 		    u64 start_offset, u64 range,
 		    u64 reserve_offset, u64 reserve_range,
 		    const struct drm_gpuvm_ops *ops);
 void drm_gpuvm_destroy(struct drm_gpuvm *gpuvm);
 
+/**
+ * drm_gpuvm_resv() - returns the &drm_gpuvm's &dma_resv
+ * @gpuvm__: the &drm_gpuvm
+ *
+ * Returns: a pointer to the &drm_gpuvm's &dma_resv
+ */
+#define drm_gpuvm_resv(gpuvm__) (&(gpuvm__)->d_obj._resv)
+
 static inline struct drm_gpuva *
 __drm_gpuva_next(struct drm_gpuva *va)
 {
-- 
2.41.0