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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2019 Intel Corporation
*/
#ifndef I915_SW_FENCE_WORK_H
#define I915_SW_FENCE_WORK_H
#include <linux/dma-fence.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include "i915_sw_fence.h"
struct dma_fence_work;
struct dma_fence_work_ops {
const char *name;
void (*work)(struct dma_fence_work *f);
void (*release)(struct dma_fence_work *f);
};
struct dma_fence_work {
struct dma_fence dma;
spinlock_t lock;
struct i915_sw_fence chain;
struct i915_sw_dma_fence_cb cb;
struct work_struct work;
const struct dma_fence_work_ops *ops;
};
enum {
DMA_FENCE_WORK_IMM = DMA_FENCE_FLAG_USER_BITS,
};
void dma_fence_work_init(struct dma_fence_work *f,
const struct dma_fence_work_ops *ops);
int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal);
static inline void dma_fence_work_commit(struct dma_fence_work *f)
{
i915_sw_fence_commit(&f->chain);
}
/**
* dma_fence_work_commit_imm: Commit the fence, and if possible execute locally.
* @f: the fenced worker
*
* Instead of always scheduling a worker to execute the callback (see
* dma_fence_work_commit()), we try to execute the callback immediately in
* the local context. It is required that the fence be committed before it
* is published, and that no other threads try to tamper with the number
* of asynchronous waits on the fence (or else the callback will be
* executed in the wrong context, i.e. not the callers).
*/
static inline void dma_fence_work_commit_imm(struct dma_fence_work *f)
{
if (atomic_read(&f->chain.pending) <= 1)
__set_bit(DMA_FENCE_WORK_IMM, &f->dma.flags);
dma_fence_work_commit(f);
}
#endif /* I915_SW_FENCE_WORK_H */
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