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If the caller allows and we do not have to wait for any signals, immediately execute the work within the caller's process. By doing so we avoid the overhead of scheduling a new task, and the latency in executing it, at the cost of pulling that work back into the immediate context. (Sometimes we still prefer to offload the task to another cpu, especially if we plan on executing many such tasks in parallel for this client.) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200325120227.8044-2-chris@chris-wilson.co.uk
103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#include "i915_sw_fence_work.h"
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static void fence_complete(struct dma_fence_work *f)
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{
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if (f->ops->release)
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f->ops->release(f);
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dma_fence_signal(&f->dma);
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}
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static void fence_work(struct work_struct *work)
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{
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struct dma_fence_work *f = container_of(work, typeof(*f), work);
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int err;
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err = f->ops->work(f);
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if (err)
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dma_fence_set_error(&f->dma, err);
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fence_complete(f);
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dma_fence_put(&f->dma);
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}
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static int __i915_sw_fence_call
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fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
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{
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struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
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switch (state) {
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case FENCE_COMPLETE:
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if (fence->error)
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dma_fence_set_error(&f->dma, fence->error);
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if (!f->dma.error) {
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dma_fence_get(&f->dma);
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if (test_bit(DMA_FENCE_WORK_IMM, &f->dma.flags))
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fence_work(&f->work);
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else
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queue_work(system_unbound_wq, &f->work);
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} else {
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fence_complete(f);
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}
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break;
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case FENCE_FREE:
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dma_fence_put(&f->dma);
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break;
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}
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return NOTIFY_DONE;
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}
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static const char *get_driver_name(struct dma_fence *fence)
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{
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return "dma-fence";
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}
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static const char *get_timeline_name(struct dma_fence *fence)
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{
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struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
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return f->ops->name ?: "work";
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}
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static void fence_release(struct dma_fence *fence)
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{
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struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
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i915_sw_fence_fini(&f->chain);
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BUILD_BUG_ON(offsetof(typeof(*f), dma));
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dma_fence_free(&f->dma);
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}
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static const struct dma_fence_ops fence_ops = {
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.get_driver_name = get_driver_name,
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.get_timeline_name = get_timeline_name,
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.release = fence_release,
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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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{
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f->ops = ops;
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spin_lock_init(&f->lock);
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dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
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i915_sw_fence_init(&f->chain, fence_notify);
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INIT_WORK(&f->work, fence_work);
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}
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int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
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{
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if (!signal)
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return 0;
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return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
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}
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