[PATCH 3/3] drm/amdgpu: always allocate a PASIDs for each VM v2

[Christian König]

Start to always allocate a pasid for each VM.

v2: use dev_warn when we run out of PASIDs

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 43 ++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 5773a581761b..a108b30d8186 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -805,7 +805,7 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct 
drm_file *file_priv)
 {
        struct amdgpu_device *adev = dev->dev_private;
        struct amdgpu_fpriv *fpriv;
-       int r;
+       int r, pasid;
 
        file_priv->driver_priv = NULL;
 
@@ -819,28 +819,25 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct 
drm_file *file_priv)
                goto out_suspend;
        }
 
-       r = amdgpu_vm_init(adev, &fpriv->vm,
-                          AMDGPU_VM_CONTEXT_GFX, 0);
-       if (r) {
-               kfree(fpriv);
-               goto out_suspend;
+       pasid = amdgpu_pasid_alloc(16);
+       if (pasid < 0) {
+               dev_warn(adev->dev, "No more PASIDs available!");
+               pasid = 0;
        }
+       r = amdgpu_vm_init(adev, &fpriv->vm, AMDGPU_VM_CONTEXT_GFX, pasid);
+       if (r)
+               goto error_pasid;
 
        fpriv->prt_va = amdgpu_vm_bo_add(adev, &fpriv->vm, NULL);
        if (!fpriv->prt_va) {
                r = -ENOMEM;
-               amdgpu_vm_fini(adev, &fpriv->vm);
-               kfree(fpriv);
-               goto out_suspend;
+               goto error_vm;
        }
 
        if (amdgpu_sriov_vf(adev)) {
                r = amdgpu_map_static_csa(adev, &fpriv->vm, &fpriv->csa_va);
-               if (r) {
-                       amdgpu_vm_fini(adev, &fpriv->vm);
-                       kfree(fpriv);
-                       goto out_suspend;
-               }
+               if (r)
+                       goto error_vm;
        }
 
        mutex_init(&fpriv->bo_list_lock);
@@ -849,6 +846,16 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct 
drm_file *file_priv)
        amdgpu_ctx_mgr_init(&fpriv->ctx_mgr);
 
        file_priv->driver_priv = fpriv;
+       goto out_suspend;
+
+error_vm:
+       amdgpu_vm_fini(adev, &fpriv->vm);
+
+error_pasid:
+       if (pasid)
+               amdgpu_pasid_free(pasid);
+
+       kfree(fpriv);
 
 out_suspend:
        pm_runtime_mark_last_busy(dev->dev);
@@ -871,6 +878,8 @@ void amdgpu_driver_postclose_kms(struct drm_device *dev,
        struct amdgpu_device *adev = dev->dev_private;
        struct amdgpu_fpriv *fpriv = file_priv->driver_priv;
        struct amdgpu_bo_list *list;
+       struct amdgpu_bo *pd;
+       unsigned int pasid;
        int handle;
 
        if (!fpriv)
@@ -895,7 +904,13 @@ void amdgpu_driver_postclose_kms(struct drm_device *dev,
                amdgpu_bo_unreserve(adev->virt.csa_obj);
        }
 
+       pasid = fpriv->vm.pasid;
+       pd = amdgpu_bo_ref(fpriv->vm.root.base.bo);
+
        amdgpu_vm_fini(adev, &fpriv->vm);
+       if (pasid)
+               amdgpu_pasid_free_delayed(pd->tbo.resv, pasid);
+       amdgpu_bo_unref(&pd);
 
        idr_for_each_entry(&fpriv->bo_list_handles, list, handle)
                amdgpu_bo_list_free(list);
-- 
2.14.1