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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Intel Corporation
*/
#include <linux/dma-fence.h>
#include <linux/interval_tree_generic.h>
#include <linux/slab.h>
#include "xe_macros.h"
#include "xe_range_fence.h"
#define XE_RANGE_TREE_START(_node) ((_node)->start)
#define XE_RANGE_TREE_LAST(_node) ((_node)->last)
INTERVAL_TREE_DEFINE(struct xe_range_fence, rb, u64, __subtree_last,
XE_RANGE_TREE_START, XE_RANGE_TREE_LAST, static,
xe_range_fence_tree);
static void
xe_range_fence_signal_notify(struct dma_fence *fence, struct dma_fence_cb *cb)
{
struct xe_range_fence *rfence = container_of(cb, typeof(*rfence), cb);
struct xe_range_fence_tree *tree = rfence->tree;
llist_add(&rfence->link, &tree->list);
}
static bool __xe_range_fence_tree_cleanup(struct xe_range_fence_tree *tree)
{
struct llist_node *node = llist_del_all(&tree->list);
struct xe_range_fence *rfence, *next;
llist_for_each_entry_safe(rfence, next, node, link) {
xe_range_fence_tree_remove(rfence, &tree->root);
dma_fence_put(rfence->fence);
kfree(rfence);
}
return !!node;
}
/**
* xe_range_fence_insert() - range fence insert
* @tree: range fence tree to insert intoi
* @rfence: range fence
* @ops: range fence ops
* @start: start address of range fence
* @last: last address of range fence
* @fence: dma fence which signals range fence can be removed + freed
*
* Return: 0 on success, non-zero on failure
*/
int xe_range_fence_insert(struct xe_range_fence_tree *tree,
struct xe_range_fence *rfence,
const struct xe_range_fence_ops *ops,
u64 start, u64 last, struct dma_fence *fence)
{
int err = 0;
__xe_range_fence_tree_cleanup(tree);
if (dma_fence_is_signaled(fence))
goto free;
rfence->ops = ops;
rfence->start = start;
rfence->last = last;
rfence->tree = tree;
rfence->fence = dma_fence_get(fence);
err = dma_fence_add_callback(fence, &rfence->cb,
xe_range_fence_signal_notify);
if (err == -ENOENT) {
dma_fence_put(fence);
err = 0;
goto free;
} else if (err == 0) {
xe_range_fence_tree_insert(rfence, &tree->root);
return 0;
}
free:
if (ops->free)
ops->free(rfence);
return err;
}
static void xe_range_fence_tree_remove_all(struct xe_range_fence_tree *tree)
{
struct xe_range_fence *rfence;
bool retry = true;
rfence = xe_range_fence_tree_iter_first(&tree->root, 0, U64_MAX);
while (rfence) {
/* Should be ok with the minimalistic callback */
if (dma_fence_remove_callback(rfence->fence, &rfence->cb))
llist_add(&rfence->link, &tree->list);
rfence = xe_range_fence_tree_iter_next(rfence, 0, U64_MAX);
}
while (retry)
retry = __xe_range_fence_tree_cleanup(tree);
}
/**
* xe_range_fence_tree_init() - Init range fence tree
* @tree: range fence tree
*/
void xe_range_fence_tree_init(struct xe_range_fence_tree *tree)
{
memset(tree, 0, sizeof(*tree));
}
/**
* xe_range_fence_tree_fini() - Fini range fence tree
* @tree: range fence tree
*/
void xe_range_fence_tree_fini(struct xe_range_fence_tree *tree)
{
xe_range_fence_tree_remove_all(tree);
XE_WARN_ON(!RB_EMPTY_ROOT(&tree->root.rb_root));
}
/**
* xe_range_fence_tree_first() - range fence tree iterator first
* @tree: range fence tree
* @start: start address of range fence
* @last: last address of range fence
*
* Return: first range fence found in range or NULL
*/
struct xe_range_fence *
xe_range_fence_tree_first(struct xe_range_fence_tree *tree, u64 start,
u64 last)
{
return xe_range_fence_tree_iter_first(&tree->root, start, last);
}
/**
* xe_range_fence_tree_next() - range fence tree iterator next
* @rfence: current range fence
* @start: start address of range fence
* @last: last address of range fence
*
* Return: next range fence found in range or NULL
*/
struct xe_range_fence *
xe_range_fence_tree_next(struct xe_range_fence *rfence, u64 start, u64 last)
{
return xe_range_fence_tree_iter_next(rfence, start, last);
}
const struct xe_range_fence_ops xe_range_fence_kfree_ops = {
.free = (void (*)(struct xe_range_fence *rfence)) kfree,
};
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