Re: [PATCH 2/2] drm/amdgpu: separate out vm pasid assignment

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On 2021-06-29 11:19 a.m., Nirmoy Das wrote:
Use new helper function amdgpu_vm_set_pasid() to
assign vm pasid value. This also ensures that we don't free
a pasid from vm code as pasids are allocated somewhere else.

Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxx>

Christian's comments notwithstanding, the series is

Acked-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>


---
  .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  | 13 ++++++++-
  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c       | 10 +++++--
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c        | 28 +++----------------
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h        |  4 +--
  4 files changed, 26 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index f96598279593..3a2ac7f66bbd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1287,11 +1287,22 @@ int amdgpu_amdkfd_gpuvm_acquire_process_vm(struct kgd_dev *kgd,
  	if (avm->process_info)
  		return -EINVAL;
+ /* Free the original amdgpu allocated pasid,
+	 * will be replaced with kfd allocated pasid.
+	 */
+	if (avm->pasid) {
+		amdgpu_pasid_free(avm->pasid);
+		amdgpu_vm_set_pasid(adev, avm, 0);
+	}
+
  	/* Convert VM into a compute VM */
-	ret = amdgpu_vm_make_compute(adev, avm, pasid);
+	ret = amdgpu_vm_make_compute(adev, avm);
  	if (ret)
  		return ret;
+ ret = amdgpu_vm_set_pasid(adev, avm, pasid);
+	if (ret)
+		return ret;
  	/* Initialize KFD part of the VM and process info */
  	ret = init_kfd_vm(avm, process_info, ef);
  	if (ret)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index cbb932f97355..66bf8b0c56bb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -1178,10 +1178,14 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
  		pasid = 0;
  	}
- r = amdgpu_vm_init(adev, &fpriv->vm, pasid);
+	r = amdgpu_vm_init(adev, &fpriv->vm);
  	if (r)
  		goto error_pasid;
+ r = amdgpu_vm_set_pasid(adev, &fpriv->vm, pasid);
+	if (r)
+		goto error_vm;
+
  	fpriv->prt_va = amdgpu_vm_bo_add(adev, &fpriv->vm, NULL);
  	if (!fpriv->prt_va) {
  		r = -ENOMEM;
@@ -1209,8 +1213,10 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
  	amdgpu_vm_fini(adev, &fpriv->vm);
error_pasid:
-	if (pasid)
+	if (pasid) {
  		amdgpu_pasid_free(pasid);
+		amdgpu_vm_set_pasid(adev, &fpriv->vm, 0);
+	}
kfree(fpriv); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index fd92ff27931a..1dccede6387e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2899,14 +2899,13 @@ long amdgpu_vm_wait_idle(struct amdgpu_vm *vm, long timeout)
   *
   * @adev: amdgpu_device pointer
   * @vm: requested vm
- * @pasid: Process address space identifier
   *
   * Init @vm fields.
   *
   * Returns:
   * 0 for success, error for failure.
   */
-int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm, u32 pasid)
+int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
  {
  	struct amdgpu_bo *root_bo;
  	struct amdgpu_bo_vm *root;
@@ -2980,10 +2979,6 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm, u32 pasid)
amdgpu_bo_unreserve(vm->root.bo); - r = amdgpu_vm_set_pasid(adev, vm, pasid);
-	if (r)
-		goto error_free_root;
-
  	INIT_KFIFO(vm->faults);
return 0;
@@ -3039,7 +3034,6 @@ static int amdgpu_vm_check_clean_reserved(struct amdgpu_device *adev,
   *
   * @adev: amdgpu_device pointer
   * @vm: requested vm
- * @pasid: pasid to use
   *
   * This only works on GFX VMs that don't have any BOs added and no
   * page tables allocated yet.
@@ -3047,7 +3041,6 @@ static int amdgpu_vm_check_clean_reserved(struct amdgpu_device *adev,
   * Changes the following VM parameters:
   * - use_cpu_for_update
   * - pte_supports_ats
- * - pasid (old PASID is released, because compute manages its own PASIDs)
   *
   * Reinitializes the page directory to reflect the changed ATS
   * setting.
@@ -3055,8 +3048,7 @@ static int amdgpu_vm_check_clean_reserved(struct amdgpu_device *adev,
   * Returns:
   * 0 for success, -errno for errors.
   */
-int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm,
-			   u32 pasid)
+int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
  {
  	bool pte_support_ats = (adev->asic_type == CHIP_RAVEN);
  	int r;
@@ -3070,16 +3062,6 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm,
  	if (r)
  		goto unreserve_bo;
- /* Free the original amdgpu allocated pasid,
-	 * will be replaced with kfd allocated pasid.
-	 */
-	if (vm->pasid)
-		amdgpu_pasid_free(vm->pasid);
-
-	r = amdgpu_vm_set_pasid(adev, vm, pasid);
-	if (r)
-		goto unreserve_bo;
-
  	/* Check if PD needs to be reinitialized and do it before
  	 * changing any other state, in case it fails.
  	 */
@@ -3089,7 +3071,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm,
  				       to_amdgpu_bo_vm(vm->root.bo),
  				       false);
  		if (r)
-			goto free_pasid_entry;
+			goto unreserve_bo;
  	}
/* Update VM state */
@@ -3106,7 +3088,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm,
  		r = amdgpu_bo_sync_wait(vm->root.bo,
  					AMDGPU_FENCE_OWNER_UNDEFINED, true);
  		if (r)
-			goto free_pasid_entry;
+			goto unreserve_bo;
vm->update_funcs = &amdgpu_vm_cpu_funcs;
  	} else {
@@ -3121,8 +3103,6 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm,
goto unreserve_bo; -free_pasid_entry:
-	amdgpu_vm_set_pasid(adev, vm, 0);
  unreserve_bo:
  	amdgpu_bo_unreserve(vm->root.bo);
  	return r;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 8e8bc132e590..a0bceccaa6b5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -378,8 +378,8 @@ int amdgpu_vm_set_pasid(struct amdgpu_device *adev, struct amdgpu_vm *vm,
  			unsigned long pasid);
long amdgpu_vm_wait_idle(struct amdgpu_vm *vm, long timeout);
-int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm, u32 pasid);
-int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm, u32 pasid);
+int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm);
+int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm);
  void amdgpu_vm_release_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm);
  void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm);
  void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
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