<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body link="#0B6CDA" vlink="#551A8B" text="#000000" bgcolor="#cce8cf" alink="#EE0000"> On 09/12/2018 04:54 PM, Christian König wrote: <blockquote type="cite" cite="mid:20180912085445.3245-1-christian.koenig@amd.com"> <pre wrap="">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 <a class="moz-txt-link-rfc2396E" href="mailto:christian.koenig@amd.com"><christian.koenig@amd.com></a></pre> </blockquote> Reviewed-by: Junwei Zhang <a class="moz-txt-link-rfc2396E" href="mailto:Jerry.Zhang@amd.com"><Jerry.Zhang@amd.com></a> <blockquote type="cite" cite="mid:20180912085445.3245-1-christian.koenig@amd.com"> <pre wrap=""> --- 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 * </pre> </blockquote> </body> </html>