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1/* SPDX-License-Identifier: MIT */2 3/*4 * Copyright © 2019 Intel Corporation5 */6 7#ifndef I915_SW_FENCE_WORK_H8#define I915_SW_FENCE_WORK_H9 10#include <linux/dma-fence.h>11#include <linux/spinlock.h>12#include <linux/workqueue.h>13 14#include "i915_sw_fence.h"15 16struct dma_fence_work;17 18struct dma_fence_work_ops {19 const char *name;20 void (*work)(struct dma_fence_work *f);21 void (*release)(struct dma_fence_work *f);22};23 24struct dma_fence_work {25 struct dma_fence dma;26 spinlock_t lock;27 28 struct i915_sw_fence chain;29 struct i915_sw_dma_fence_cb cb;30 31 struct work_struct work;32 const struct dma_fence_work_ops *ops;33};34 35enum {36 DMA_FENCE_WORK_IMM = DMA_FENCE_FLAG_USER_BITS,37};38 39void dma_fence_work_init(struct dma_fence_work *f,40 const struct dma_fence_work_ops *ops);41int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal);42 43static inline void dma_fence_work_commit(struct dma_fence_work *f)44{45 i915_sw_fence_commit(&f->chain);46}47 48/**49 * dma_fence_work_commit_imm: Commit the fence, and if possible execute locally.50 * @f: the fenced worker51 *52 * Instead of always scheduling a worker to execute the callback (see53 * dma_fence_work_commit()), we try to execute the callback immediately in54 * the local context. It is required that the fence be committed before it55 * is published, and that no other threads try to tamper with the number56 * of asynchronous waits on the fence (or else the callback will be57 * executed in the wrong context, i.e. not the callers).58 */59static inline void dma_fence_work_commit_imm(struct dma_fence_work *f)60{61 if (atomic_read(&f->chain.pending) <= 1)62 __set_bit(DMA_FENCE_WORK_IMM, &f->dma.flags);63 64 dma_fence_work_commit(f);65}66 67#endif /* I915_SW_FENCE_WORK_H */68