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