Re: [PATCH 1/8] drm/amdgpu: add some VM PD/PT iterators v2

["Zhang, Jerry(Junwei)" <Jerry.Zhang-5C7GfCeVMHo@public.gmane.org>]

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On 09/12/2018 04:54 PM, Christian König wrote:
> Both a leaf as well as dfs iterator to walk over all the PDs/PTs. v2: 
> update comments and fix for_each_amdgpu_vm_pt_dfs_safe Signed-off-by: 
> Christian König <christian.koenig-5C7GfCeVMHo@public.gmane.org>
Reviewed-by: Junwei Zhang <Jerry.Zhang-5C7GfCeVMHo@public.gmane.org>
> --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 224 
> +++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 
> 136b00412dc8..787a200cf796 100644 --- 
> a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -355,6 +355,230 @@ static 
> struct amdgpu_vm_pt *amdgpu_vm_pt_parent(struct amdgpu_vm_pt *pt) 
> return list_first_entry(&parent->va, struct amdgpu_vm_pt, 
> base.bo_list); } +/** + * amdgpu_vm_pt_cursor - state for 
> for_each_amdgpu_vm_pt + */ +struct amdgpu_vm_pt_cursor { + uint64_t 
> pfn; + struct amdgpu_vm_pt *parent; + struct amdgpu_vm_pt *entry; + 
> unsigned level; +}; + +/** + * amdgpu_vm_pt_start - start PD/PT walk + 
> * + * @adev: amdgpu_device pointer + * @vm: amdgpu_vm structure + * 
> @start: start address of the walk + * @cursor: state to initialize + * 
> + * Initialize a amdgpu_vm_pt_cursor to start a walk. + */ +static 
> void amdgpu_vm_pt_start(struct amdgpu_device *adev, + struct amdgpu_vm 
> *vm, uint64_t start, + struct amdgpu_vm_pt_cursor *cursor) +{ + 
> cursor->pfn = start; + cursor->parent = NULL; + cursor->entry = 
> &vm->root; + cursor->level = adev->vm_manager.root_level; +} + +/** + 
> * amdgpu_vm_pt_descendant - go to child node + * + * @adev: 
> amdgpu_device pointer + * @cursor: current state + * + * Walk to the 
> child node of the current node. + * Returns: + * True if the walk was 
> possible, false otherwise. + */ +static bool 
> amdgpu_vm_pt_descendant(struct amdgpu_device *adev, + struct 
> amdgpu_vm_pt_cursor *cursor) +{ + unsigned num_entries, shift, idx; + 
> + if (!cursor->entry->entries) + return false; + + 
> BUG_ON(!cursor->entry->base.bo); + num_entries = 
> amdgpu_vm_num_entries(adev, cursor->level); + shift = 
> amdgpu_vm_level_shift(adev, cursor->level); + + ++cursor->level; + idx 
> = (cursor->pfn >> shift) % num_entries; + cursor->parent = 
> cursor->entry; + cursor->entry = &cursor->entry->entries[idx]; + 
> return true; +} + +/** + * amdgpu_vm_pt_sibling - go to sibling node + 
> * + * @adev: amdgpu_device pointer + * @cursor: current state + * + * 
> Walk to the sibling node of the current node. + * Returns: + * True if 
> the walk was possible, false otherwise. + */ +static bool 
> amdgpu_vm_pt_sibling(struct amdgpu_device *adev, + struct 
> amdgpu_vm_pt_cursor *cursor) +{ + unsigned shift, num_entries; + + /* 
> Root doesn't have a sibling */ + if (!cursor->parent) + return false; 
> + + /* Go to our parents and see if we got a sibling */ + shift = 
> amdgpu_vm_level_shift(adev, cursor->level - 1); + num_entries = 
> amdgpu_vm_num_entries(adev, cursor->level - 1); + + if (cursor->entry 
> == &cursor->parent->entries[num_entries - 1]) + return false; + + 
> cursor->pfn += 1ULL << shift; + cursor->pfn &= ~((1ULL << shift) - 1); 
> + ++cursor->entry; + return true; +} + +/** + * amdgpu_vm_pt_ancestor 
> - go to parent node + * + * @cursor: current state + * + * Walk to the 
> parent node of the current node. + * Returns: + * True if the walk was 
> possible, false otherwise. + */ +static bool 
> amdgpu_vm_pt_ancestor(struct amdgpu_vm_pt_cursor *cursor) +{ + if 
> (!cursor->parent) + return false; + + --cursor->level; + cursor->entry 
> = cursor->parent; + cursor->parent = 
> amdgpu_vm_pt_parent(cursor->parent); + return true; +} + +/** + * 
> amdgpu_vm_pt_next - get next PD/PT in hieratchy + * + * @adev: 
> amdgpu_device pointer + * @cursor: current state + * + * Walk the 
> PD/PT tree to the next node. + */ +static void 
> amdgpu_vm_pt_next(struct amdgpu_device *adev, + struct 
> amdgpu_vm_pt_cursor *cursor) +{ + /* First try a newborn child */ + if 
> (amdgpu_vm_pt_descendant(adev, cursor)) + return; + + /* If that 
> didn't worked try to find a sibling */ + while 
> (!amdgpu_vm_pt_sibling(adev, cursor)) { + /* No sibling, go to our 
> parents and grandparents */ + if (!amdgpu_vm_pt_ancestor(cursor)) { + 
> cursor->pfn = ~0ll; + return; + } + } +} + +/** + * 
> amdgpu_vm_pt_first_leaf - get first leaf PD/PT + * + * @adev: 
> amdgpu_device pointer + * @vm: amdgpu_vm structure + * @start: start 
> addr of the walk + * @cursor: state to initialize + * + * Start a walk 
> and go directly to the leaf node. + */ +static void 
> amdgpu_vm_pt_first_leaf(struct amdgpu_device *adev, + struct amdgpu_vm 
> *vm, uint64_t start, + struct amdgpu_vm_pt_cursor *cursor) +{ + 
> amdgpu_vm_pt_start(adev, vm, start, cursor); + while 
> (amdgpu_vm_pt_descendant(adev, cursor)); +} + +/** + * 
> amdgpu_vm_pt_next_leaf - get next leaf PD/PT + * + * @adev: 
> amdgpu_device pointer + * @cursor: current state + * + * Walk the 
> PD/PT tree to the next leaf node. + */ +static void 
> amdgpu_vm_pt_next_leaf(struct amdgpu_device *adev, + struct 
> amdgpu_vm_pt_cursor *cursor) +{ + amdgpu_vm_pt_next(adev, cursor); + 
> while (amdgpu_vm_pt_descendant(adev, cursor)); +} + +/** + * 
> for_each_amdgpu_vm_pt_leaf - walk over all leaf PDs/PTs in the 
> hierarchy + */ +#define for_each_amdgpu_vm_pt_leaf(adev, vm, start, 
> end, cursor) \ + for (amdgpu_vm_pt_first_leaf((adev), (vm), (start), 
> &(cursor)); \ + (cursor).pfn <= end; amdgpu_vm_pt_next_leaf((adev), 
> &(cursor))) + +/** + * amdgpu_vm_pt_first_dfs - start a deep first 
> search + * + * @adev: amdgpu_device structure + * @vm: amdgpu_vm 
> structure + * @cursor: state to initialize + * + * Starts a deep first 
> traversal of the PD/PT tree. + */ +static void 
> amdgpu_vm_pt_first_dfs(struct amdgpu_device *adev, + struct amdgpu_vm 
> *vm, + struct amdgpu_vm_pt_cursor *cursor) +{ + 
> amdgpu_vm_pt_start(adev, vm, 0, cursor); + while 
> (amdgpu_vm_pt_descendant(adev, cursor)); +} + +/** + * 
> amdgpu_vm_pt_next_dfs - get the next node for a deep first search + * 
> + * @adev: amdgpu_device structure + * @cursor: current state + * + * 
> Move the cursor to the next node in a deep first search. + */ +static 
> void amdgpu_vm_pt_next_dfs(struct amdgpu_device *adev, + struct 
> amdgpu_vm_pt_cursor *cursor) +{ + if (!cursor->entry) + return; + + if 
> (!cursor->parent) + cursor->entry = NULL; + else if 
> (amdgpu_vm_pt_sibling(adev, cursor)) + while 
> (amdgpu_vm_pt_descendant(adev, cursor)); + else + 
> amdgpu_vm_pt_ancestor(cursor); +} + +/** + * 
> for_each_amdgpu_vm_pt_dfs_safe - safe deep first search of all PDs/PTs 
> + */ +#define for_each_amdgpu_vm_pt_dfs_safe(adev, vm, cursor, entry) 
> \ + for (amdgpu_vm_pt_first_dfs((adev), (vm), &(cursor)), \ + (entry) 
> = (cursor).entry, amdgpu_vm_pt_next_dfs((adev), &(cursor));\ + 
> (entry); (entry) = (cursor).entry, \ + amdgpu_vm_pt_next_dfs((adev), 
> &(cursor))) + /** * amdgpu_vm_get_pd_bo - add the VM PD to a 
> validation list *


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