amdgpu_vm_make_compute is used to turn a GFX VM into a compute VM,
the prerequisite is this VM is clean. Let's check if some page tables
are already filled , while not check if some mapping is already made.
Signed-off-by: Trigger Huang <Trigger.Huang@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 33 ++++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 56d838f..bde8bcd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2755,6 +2755,37 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
}
/**
+ * amdgpu_vm_check_clean_reserved - check if a VM is clean
+ *
+ * @adev: amdgpu_device pointer
+ * @vm: the VM to check
+ *
+ * check all entries of the root PD, if any subsequent PDs are allocated,
+ * it means there are page table creating and filling, and is no a clean
+ * VM
+ *
+ * Returns:
+ * 0 if this VM is clean
+ */
+static int amdgpu_vm_check_clean_reserved(struct amdgpu_device *adev,
+ struct amdgpu_vm *vm)
+{
+ enum amdgpu_vm_level root = adev->vm_manager.root_level;
+ unsigned int entries = amdgpu_vm_num_entries(adev, root);
+ unsigned int i = 0;
+
+ if (!(vm->root.entries))
+ return 0;
+
+ for (i = 0; i < entries; i++) {
+ if (vm->root.entries[i].base.bo)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
* amdgpu_vm_make_compute - Turn a GFX VM into a compute VM
*
* @adev: amdgpu_device pointer
@@ -2784,7 +2815,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm, uns
return r;
/* Sanity checks */
- if (!RB_EMPTY_ROOT(&vm->va.rb_root) || vm->root.entries) {
+ if (amdgpu_vm_check_clean_reserved(adev, vm)) {
r = -EINVAL;
goto unreserve_bo;
}
--
2.7.4
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