i915_sw_fence_work.h (1716B)
1/* SPDX-License-Identifier: MIT */ 2 3/* 4 * Copyright © 2019 Intel Corporation 5 */ 6 7#ifndef I915_SW_FENCE_WORK_H 8#define I915_SW_FENCE_WORK_H 9 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 worker 51 * 52 * Instead of always scheduling a worker to execute the callback (see 53 * dma_fence_work_commit()), we try to execute the callback immediately in 54 * the local context. It is required that the fence be committed before it 55 * is published, and that no other threads try to tamper with the number 56 * of asynchronous waits on the fence (or else the callback will be 57 * 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 */