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/*
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 * Copyright © 2014 Broadcom
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice (including the next
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 * paragraph) shall be included in all copies or substantial portions of the
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 * Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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 * IN THE SOFTWARE.
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 */
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/** @file vc4_fence.c
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 *
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 * Seqno-based fence management.
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 *
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 * We have two mechanisms for waiting in our kernel API: You can wait on a BO
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 * to have all rendering to from any process to be completed, or wait on a
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 * seqno for that particular seqno to be passed.  The fence API we're
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 * implementing is based on waiting for all rendering in the context to have
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 * completed (with no reference to what other processes might be doing with
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 * the same BOs), so we can just use the seqno of the last rendering we'd
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 * fired off as our fence marker.
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 */
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#include "util/u_inlines.h"
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#include "vc4_screen.h"
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#include "vc4_bufmgr.h"
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struct vc4_fence {
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        struct pipe_reference reference;
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        uint64_t seqno;
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};
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static void
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vc4_fence_reference(struct pipe_screen *pscreen,
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                    struct pipe_fence_handle **pp,
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                    struct pipe_fence_handle *pf)
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{
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        struct vc4_fence **p = (struct vc4_fence **)pp;
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        struct vc4_fence *f = (struct vc4_fence *)pf;
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        struct vc4_fence *old = *p;
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        if (pipe_reference(&(*p)->reference, &f->reference)) {
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                free(old);
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        }
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        *p = f;
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}
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static boolean
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vc4_fence_signalled(struct pipe_screen *pscreen,
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                    struct pipe_fence_handle *pf)
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{
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        struct vc4_screen *screen = vc4_screen(pscreen);
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        struct vc4_fence *f = (struct vc4_fence *)pf;
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        return vc4_wait_seqno(screen, f->seqno, 0);
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}
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static boolean
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vc4_fence_finish(struct pipe_screen *pscreen,
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                 struct pipe_fence_handle *pf,
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                 uint64_t timeout_ns)
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{
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        struct vc4_screen *screen = vc4_screen(pscreen);
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        struct vc4_fence *f = (struct vc4_fence *)pf;
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        return vc4_wait_seqno(screen, f->seqno, timeout_ns);
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}
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struct vc4_fence *
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vc4_fence_create(struct vc4_screen *screen, uint64_t seqno)
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{
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        struct vc4_fence *f = calloc(1, sizeof(*f));
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        if (!f)
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                return NULL;
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        pipe_reference_init(&f->reference, 1);
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        f->seqno = seqno;
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        return f;
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}
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void
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vc4_fence_init(struct vc4_screen *screen)
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{
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        screen->base.fence_reference = vc4_fence_reference;
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        screen->base.fence_signalled = vc4_fence_signalled;
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        screen->base.fence_finish = vc4_fence_finish;
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}