4 files changed, 123 insertions, 8 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 0240f108f90e..b311b389bd5a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -507,14 +507,16 @@ static int amdgpu_gem_va_check(void *param, struct amdgpu_bo *bo)
  * amdgpu_gem_va_update_vm -update the bo_va in its VM
  *
  * @adev: amdgpu_device pointer
+ * @vm: vm to update
  * @bo_va: bo_va to update
  * @list: validation list
- * @operation: map or unmap
+ * @operation: map, unmap or clear
  *
  * Update the bo_va directly after setting its address. Errors are not
  * vital here, so they are not reported back to userspace.
  */
 static void amdgpu_gem_va_update_vm(struct amdgpu_device *adev,
+                                    struct amdgpu_vm *vm,
                                     struct amdgpu_bo_va *bo_va,
                                     struct list_head *list,
                                     uint32_t operation)
@@ -529,16 +531,16 @@ static void amdgpu_gem_va_update_vm(struct amdgpu_device *adev,
                         goto error;
         }
 
-        r = amdgpu_vm_validate_pt_bos(adev, bo_va->vm, amdgpu_gem_va_check,
+        r = amdgpu_vm_validate_pt_bos(adev, vm, amdgpu_gem_va_check,
                                       NULL);
         if (r)
                 goto error;
 
-        r = amdgpu_vm_update_page_directory(adev, bo_va->vm);
+        r = amdgpu_vm_update_page_directory(adev, vm);
         if (r)
                 goto error;
 
-        r = amdgpu_vm_clear_freed(adev, bo_va->vm);
+        r = amdgpu_vm_clear_freed(adev, vm);
         if (r)
                 goto error;
 
@@ -592,6 +594,7 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
         switch (args->operation) {
         case AMDGPU_VA_OP_MAP:
         case AMDGPU_VA_OP_UNMAP:
+        case AMDGPU_VA_OP_CLEAR:
                 break;
         default:
                 dev_err(&dev->pdev->dev, "unsupported operation %d\n",
@@ -600,7 +603,8 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
         }
 
         INIT_LIST_HEAD(&list);
-        if (!(args->flags & AMDGPU_VM_PAGE_PRT)) {
+        if ((args->operation != AMDGPU_VA_OP_CLEAR) &&
+            !(args->flags & AMDGPU_VM_PAGE_PRT)) {
                 gobj = drm_gem_object_lookup(filp, args->handle);
                 if (gobj == NULL)
                         return -ENOENT;
@@ -625,8 +629,10 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
                         r = -ENOENT;
                         goto error_backoff;
                 }
-        } else {
+        } else if (args->operation != AMDGPU_VA_OP_CLEAR) {
                 bo_va = fpriv->prt_va;
+        } else {
+                bo_va = NULL;
         }
 
         switch (args->operation) {
@@ -644,11 +650,18 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
         case AMDGPU_VA_OP_UNMAP:
                 r = amdgpu_vm_bo_unmap(adev, bo_va, args->va_address);
                 break;
+
+        case AMDGPU_VA_OP_CLEAR:
+                r = amdgpu_vm_bo_clear_mappings(adev, &fpriv->vm,
+                                                args->va_address,
+                                                args->map_size);
+                break;
         default:
                 break;
         }
         if (!r && !(args->flags & AMDGPU_VM_DELAY_UPDATE) && !amdgpu_vm_debug)
-                amdgpu_gem_va_update_vm(adev, bo_va, &list, args->operation);
+                amdgpu_gem_va_update_vm(adev, &fpriv->vm, bo_va, &list,
+                                        args->operation);
 
 error_backoff:
         ttm_eu_backoff_reservation(&ticket, &list);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
index 08ccb3d34b21..3e955190f013 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
@@ -188,7 +188,7 @@ TRACE_EVENT(amdgpu_vm_bo_map,
                              ),
 
             TP_fast_assign(
-                           __entry->bo = bo_va->bo;
+                           __entry->bo = bo_va ? bo_va->bo : NULL;
                            __entry->start = mapping->it.start;
                            __entry->last = mapping->it.last;
                            __entry->offset = mapping->offset;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 296e985d0b65..b67e94e25cfc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1613,6 +1613,105 @@ int amdgpu_vm_bo_unmap(struct amdgpu_device *adev,
 }
 
 /**
+ * amdgpu_vm_bo_clear_mappings - remove all mappings in a specific range
+ *
+ * @adev: amdgpu_device pointer
+ * @vm: VM structure to use
+ * @saddr: start of the range
+ * @size: size of the range
+ *
+ * Remove all mappings in a range, split them as appropriate.
+ * Returns 0 for success, error for failure.
+ */
+int amdgpu_vm_bo_clear_mappings(struct amdgpu_device *adev,
+                                struct amdgpu_vm *vm,
+                                uint64_t saddr, uint64_t size)
+{
+        struct amdgpu_bo_va_mapping *before, *after, *tmp, *next;
+        struct interval_tree_node *it;
+        LIST_HEAD(removed);
+        uint64_t eaddr;
+
+        eaddr = saddr + size - 1;
+        saddr /= AMDGPU_GPU_PAGE_SIZE;
+        eaddr /= AMDGPU_GPU_PAGE_SIZE;
+
+        /* Allocate all the needed memory */
+        before = kzalloc(sizeof(*before), GFP_KERNEL);
+        if (!before)
+                return -ENOMEM;
+
+        after = kzalloc(sizeof(*after), GFP_KERNEL);
+        if (!after) {
+                kfree(before);
+                return -ENOMEM;
+        }
+
+        /* Now gather all removed mappings */
+        it = interval_tree_iter_first(&vm->va, saddr, eaddr);
+        while (it) {
+                tmp = container_of(it, struct amdgpu_bo_va_mapping, it);
+                it = interval_tree_iter_next(it, saddr, eaddr);
+
+                /* Remember mapping split at the start */
+                if (tmp->it.start < saddr) {
+                        before->it.start = tmp->it.start;;
+                        before->it.last = saddr - 1;
+                        before->offset = tmp->offset;
+                        before->flags = tmp->flags;
+                        list_add(&before->list, &tmp->list);
+                }
+
+                /* Remember mapping split at the end */
+                if (tmp->it.last > eaddr) {
+                        after->it.start = eaddr + 1;
+                        after->it.last = tmp->it.last;
+                        after->offset = tmp->offset;
+                        after->offset += after->it.start - tmp->it.start;
+                        after->flags = tmp->flags;
+                        list_add(&after->list, &tmp->list);
+                }
+
+                list_del(&tmp->list);
+                list_add(&tmp->list, &removed);
+        }
+
+        /* And free them up */
+        list_for_each_entry_safe(tmp, next, &removed, list) {
+                interval_tree_remove(&tmp->it, &vm->va);
+                list_del(&tmp->list);
+
+                if (tmp->it.start < saddr)
+                    tmp->it.start = saddr;
+                if (tmp->it.last > eaddr)
+                    tmp->it.last = eaddr;
+
+                list_add(&tmp->list, &vm->freed);
+                trace_amdgpu_vm_bo_unmap(NULL, tmp);
+        }
+
+        /* Insert partial mapping before the range*/
+        if (before->it.start != before->it.last) {
+                interval_tree_insert(&before->it, &vm->va);
+                if (before->flags & AMDGPU_PTE_PRT)
+                        amdgpu_vm_prt_get(adev);
+        } else {
+                kfree(before);
+        }
+
+        /* Insert partial mapping after the range */
+        if (after->it.start != after->it.last) {
+                interval_tree_insert(&after->it, &vm->va);
+                if (after->flags & AMDGPU_PTE_PRT)
+                        amdgpu_vm_prt_get(adev);
+        } else {
+                kfree(after);
+        }
+
+        return 0;
+}
+
+/**
  * amdgpu_vm_bo_rmv - remove a bo to a specific vm
  *
  * @adev: amdgpu_device pointer
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 1e5a3b2c7927..95fe47733b7f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -210,6 +210,9 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
 int amdgpu_vm_bo_unmap(struct amdgpu_device *adev,
                        struct amdgpu_bo_va *bo_va,
                        uint64_t addr);
+int amdgpu_vm_bo_clear_mappings(struct amdgpu_device *adev,
+                                struct amdgpu_vm *vm,
+                                uint64_t saddr, uint64_t size);
 void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
                       struct amdgpu_bo_va *bo_va);