Am 20.09.23 um 16:42 schrieb Danilo Krummrich:
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;
Yeah, as pointed out in the other mail that won't work like this.
The GPUVM contains GEM objects and therefore should probably have a
reference to those objects.
When those GEM objects now use the dma-resv object embedded inside the
GPUVM then they also need a reference to the GPUVM to make sure the
dma-resv object won't be freed before they are freed.
This is a circle reference dependency.
The simplest solution I can see is to let the driver provide the GEM
object to use. Amdgpu uses the root page directory object for this.
Apart from that I strongly think that we shouldn't let the GPUVM code
create a driver GEM object. We did that in TTM for the ghost objects and
it turned out to be a bad idea.
Regards,
Christian.
};
-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)
{
