[PATCH 1/2] drm/amdgpu: Set pasid for compute vm

Oak Zeng zengshanjun at gmail.com
Tue Aug 28 17:34:38 UTC 2018


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.

Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h       |  6 ++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 10 +++----
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c           | 33 +++++++++++++++++++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h           |  2 +-
 drivers/gpu/drm/amd/amdkfd/kfd_process.c         |  4 +--
 drivers/gpu/drm/amd/include/kgd_kfd_interface.h  |  5 ++--
 6 files changed, 43 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index a8418a3..e1f6454 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -155,11 +155,11 @@ 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,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 7eadc58..0980a1f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1003,8 +1003,8 @@ static int init_kfd_vm(struct amdgpu_vm *vm, void **process_info,
 	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);
@@ -1016,7 +1016,7 @@ 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;
@@ -1039,7 +1039,7 @@ int amdgpu_amdkfd_gpuvm_create_process_vm(struct kgd_dev *kgd, void **vm,
 }
 
 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)
 {
@@ -1054,7 +1054,7 @@ 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;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 662aec5..d8a99f4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2690,7 +2690,7 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
  * 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;
@@ -2702,7 +2702,20 @@ 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
@@ -2713,7 +2726,7 @@ 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 */
@@ -2732,10 +2745,22 @@ 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;
 	}
 
-error:
+	if (pasid)
+		vm->pasid = pasid;
+
+	goto unreserve_bo;
+
+free_idr:
+	if (pasid)
+		idr_remove(&adev->vm_manager.pasid_idr, pasid);
+unreserve_bo:
 	amdgpu_bo_unreserve(vm->root.base.bo);
 	return r;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 1162c2b..c68945d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -294,7 +294,7 @@ 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);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 1d80b4f..5f559c5 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -685,11 +685,11 @@ 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;
diff --git a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
index 5733fbe..1632869 100644
--- a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
+++ b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
@@ -346,10 +346,11 @@ 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,
-- 
2.7.4



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