[PATCH drm-misc-next v2 4/7] drm/gpuvm: common dma-resv per struct drm_gpuvm

[Danilo Krummrich <dakr@redhat.com>]

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@redhat.com>
---
 drivers/gpu/drm/drm_gpuva_mgr.c        | 10 ++++++++--
 drivers/gpu/drm/nouveau/nouveau_uvmm.c |  2 +-
 include/drm/drm_gpuva_mgr.h            | 15 ++++++++++++++-
 3 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gpuva_mgr.c b/drivers/gpu/drm/drm_gpuva_mgr.c
index 0d9f15f50454..838277794990 100644
--- a/drivers/gpu/drm/drm_gpuva_mgr.c
+++ b/drivers/gpu/drm/drm_gpuva_mgr.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 +695,9 @@ 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);
+	gpuvm->resv = gpuvm->d_obj.resv;
 }
 EXPORT_SYMBOL_GPL(drm_gpuvm_init);
 
@@ -713,7 +717,9 @@ 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 4c47b2279674..21d5a06241ae 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_gpuva_mgr.h b/include/drm/drm_gpuva_mgr.h
index 1aa99a4d5665..e09e3e3ac5b2 100644
--- a/include/drm/drm_gpuva_mgr.h
+++ b/include/drm/drm_gpuva_mgr.h
@@ -240,9 +240,22 @@ 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.
+	 */
+	struct drm_gem_object d_obj;
+
+	/**
+	 * @resv: the &dma_resv for &drm_gem_objects mapped in this GPU VA
+	 * space
+	 */
+	struct dma_resv *resv;
 };
 
-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);
-- 
2.41.0