drm/amdgpu: Set pasid for compute vm (v2)

To make a amdgpu vm to a compute vm, the old pasid will be freed and
replaced with a pasid managed by kfd. Kfd can't reuse original pasid
allocated by amdgpu because kfd uses different pasid policy with amdgpu.
For example, all graphic devices share one same pasid in a process.

v2: rebase (Alex)

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

@@ -162,11 +162,11 @@ uint64_t amdgpu_amdkfd_get_vram_usage(struct kgd_dev *kgd);
 	})
 
 /* GPUVM API */
-int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, void **vm,
-					void **process_info,
+int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, unsigned int pasid,
+					void **vm, void **process_info,
 					struct dma_fence **ef);
 int amdgpu_amdkfd_gpuvm_acquire_process_vm(struct kgd_dev *kgd,
-					struct file *filp,
+					struct file *filp, unsigned int pasid,
 					void **vm, void **process_info,
 					struct dma_fence **ef);
 void amdgpu_amdkfd_gpuvm_destroy_cb(struct amdgpu_device *adev,

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

@@ -1000,8 +1000,8 @@ create_evict_fence_fail:
 	return ret;
 }
 
-int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, void **vm,
-					  void **process_info,
+int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, unsigned int pasid,
+					  void **vm, void **process_info,
 					  struct dma_fence **ef)
 {
 	struct amdgpu_device *adev = get_amdgpu_device(kgd);
@@ -1013,7 +1013,7 @@ int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, void **vm,
 		return -ENOMEM;
 
 	/* Initialize AMDGPU part of the VM */
-	ret = amdgpu_vm_init(adev, new_vm, AMDGPU_VM_CONTEXT_COMPUTE, 0);
+	ret = amdgpu_vm_init(adev, new_vm, AMDGPU_VM_CONTEXT_COMPUTE, pasid);
 	if (ret) {
 		pr_err("Failed init vm ret %d\n", ret);
 		goto amdgpu_vm_init_fail;
@@ -1036,7 +1036,7 @@ amdgpu_vm_init_fail:
 }
 
 int amdgpu_amdkfd_gpuvm_acquire_process_vm(struct kgd_dev *kgd,
-					   struct file *filp,
+					   struct file *filp, unsigned int pasid,
 					   void **vm, void **process_info,
 					   struct dma_fence **ef)
 {
@@ -1051,7 +1051,7 @@ int amdgpu_amdkfd_gpuvm_acquire_process_vm(struct kgd_dev *kgd,
 		return -EINVAL;
 
 	/* Convert VM into a compute VM */
-	ret = amdgpu_vm_make_compute(adev, avm);
+	ret = amdgpu_vm_make_compute(adev, avm, pasid);
 	if (ret)
 		return ret;
 

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

@@ -2740,7 +2740,7 @@ error_free_sched_entity:
  * Returns:
  * 0 for success, -errno for errors.
  */
-int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
+int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm, unsigned int pasid)
 {
 	bool pte_support_ats = (adev->asic_type == CHIP_RAVEN);
 	int r;
@@ -2752,7 +2752,20 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 	/* Sanity checks */
 	if (!RB_EMPTY_ROOT(&vm->va.rb_root) || vm->root.entries) {
 		r = -EINVAL;
-		goto error;
+		goto unreserve_bo;
+	}
+
+	if (pasid) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&adev->vm_manager.pasid_lock, flags);
+		r = idr_alloc(&adev->vm_manager.pasid_idr, vm, pasid, pasid + 1,
+			      GFP_ATOMIC);
+		spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, flags);
+
+		if (r == -ENOSPC)
+			goto unreserve_bo;
+		r = 0;
 	}
 
 	/* Check if PD needs to be reinitialized and do it before
@@ -2763,7 +2776,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 			       adev->vm_manager.root_level,
 			       pte_support_ats);
 		if (r)
-			goto error;
+			goto free_idr;
 	}
 
 	/* Update VM state */
@@ -2782,13 +2795,30 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 		idr_remove(&adev->vm_manager.pasid_idr, vm->pasid);
 		spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, flags);
 
+		/* Free the original amdgpu allocated pasid
+		 * Will be replaced with kfd allocated pasid
+		 */
+		amdgpu_pasid_free(vm->pasid);
 		vm->pasid = 0;
 	}
 
 	/* Free the shadow bo for compute VM */
 	amdgpu_bo_unref(&vm->root.base.bo->shadow);
 
-error:
+	if (pasid)
+		vm->pasid = pasid;
+
+	goto unreserve_bo;
+
+free_idr:
+	if (pasid) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&adev->vm_manager.pasid_lock, flags);
+		idr_remove(&adev->vm_manager.pasid_idr, pasid);
+		spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, flags);
+	}
+unreserve_bo:
 	amdgpu_bo_unreserve(vm->root.base.bo);
 	return r;
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h

@@ -297,7 +297,7 @@ void amdgpu_vm_manager_init(struct amdgpu_device *adev);
 void amdgpu_vm_manager_fini(struct amdgpu_device *adev);
 int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		   int vm_context, unsigned int pasid);
-int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm);
+int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm, unsigned int pasid);
 void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm);
 bool amdgpu_vm_pasid_fault_credit(struct amdgpu_device *adev,
 				  unsigned int pasid);

drivers/gpu/drm/amd/amdkfd/kfd_process.c

@@ -687,11 +687,11 @@ int kfd_process_device_init_vm(struct kfd_process_device *pdd,
 
 	if (drm_file)
 		ret = dev->kfd2kgd->acquire_process_vm(
-			dev->kgd, drm_file,
+			dev->kgd, drm_file, p->pasid,
 			&pdd->vm, &p->kgd_process_info, &p->ef);
 	else
 		ret = dev->kfd2kgd->create_process_vm(
-			dev->kgd, &pdd->vm, &p->kgd_process_info, &p->ef);
+			dev->kgd, p->pasid, &pdd->vm, &p->kgd_process_info, &p->ef);
 	if (ret) {
 		pr_err("Failed to create process VM object\n");
 		return ret;

drivers/gpu/drm/amd/include/kgd_kfd_interface.h

@@ -372,10 +372,11 @@ struct kfd2kgd_calls {
 			struct kfd_cu_info *cu_info);
 	uint64_t (*get_vram_usage)(struct kgd_dev *kgd);
 
-	int (*create_process_vm)(struct kgd_dev *kgd, void **vm,
+	int (*create_process_vm)(struct kgd_dev *kgd, unsigned int pasid, void **vm,
 			void **process_info, struct dma_fence **ef);
 	int (*acquire_process_vm)(struct kgd_dev *kgd, struct file *filp,
-			void **vm, void **process_info, struct dma_fence **ef);
+			unsigned int pasid, void **vm, void **process_info,
+			struct dma_fence **ef);
 	void (*destroy_process_vm)(struct kgd_dev *kgd, void *vm);
 	uint32_t (*get_process_page_dir)(void *vm);
 	void (*set_vm_context_page_table_base)(struct kgd_dev *kgd,