src/gallium/drivers/swr/swr_fence.cpp

   1 /****************************************************************************
   2  * Copyright (C) 2015 Intel Corporation.   All Rights Reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
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   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  ***************************************************************************/
  23
  24 #include "pipe/p_screen.h"
  25 #include "util/u_memory.h"
  26 #include "util/os_time.h"
  27
  28 #include "swr_context.h"
  29 #include "swr_screen.h"
  30 #include "swr_fence.h"
  31
  32 #ifdef __APPLE__
  33 #include <sched.h>
  34 #endif
  35
  36 #if defined(PIPE_CC_MSVC) // portable thread yield
  37    #define sched_yield SwitchToThread
  38 #endif
  39
  40 /*
  41  * Fence callback, called by back-end thread on completion of all rendering up
  42  * to SwrSync call.
  43  */
  44 static void
  45 swr_fence_cb(uint64_t userData, uint64_t userData2, uint64_t userData3)
  46 {
  47    struct swr_fence *fence = (struct swr_fence *)userData;
  48
  49    /* Complete all work attached to the fence */
  50    swr_fence_do_work(fence);
  51
  52    /* Correct value is in SwrSync data, and not the fence write field. */
  53    fence->read = userData2;
  54 }
  55
  56 /*
  57  * Submit an existing fence.
  58  */
  59 void
  60 swr_fence_submit(struct swr_context *ctx, struct pipe_fence_handle *fh)
  61 {
  62    struct swr_fence *fence = swr_fence(fh);
  63
  64    fence->write++;
  65    fence->pending = TRUE;
  66    ctx->api.pfnSwrSync(ctx->swrContext, swr_fence_cb, (uint64_t)fence, fence->write, 0);
  67 }
  68
  69 /*
  70  * Create a new fence object.
  71  */
  72 struct pipe_fence_handle *
  73 swr_fence_create()
  74 {
  75    static int fence_id = 0;
  76    struct swr_fence *fence = CALLOC_STRUCT(swr_fence);
  77    if (!fence)
  78       return NULL;
  79
  80    pipe_reference_init(&fence->reference, 1);
  81    fence->id = fence_id++;
  82    fence->work.tail = &fence->work.head;
  83
  84    return (struct pipe_fence_handle *)fence;
  85 }
  86
  87 /** Destroy a fence.  Called when refcount hits zero. */
  88 static void
  89 swr_fence_destroy(struct swr_fence *fence)
  90 {
  91    /* Complete any work left if fence was not submitted */
  92    swr_fence_do_work(fence);
  93    FREE(fence);
  94 }
  95
  96 /**
  97  * Set ptr = fence, with reference counting
  98  */
  99 void
 100 swr_fence_reference(struct pipe_screen *screen,
 101                     struct pipe_fence_handle **ptr,
 102                     struct pipe_fence_handle *f)
 103 {
 104    struct swr_fence *fence = swr_fence(f);
 105    struct swr_fence *old;
 106
 107    if (likely(ptr)) {
 108       old = swr_fence(*ptr);
 109       *ptr = f;
 110    } else {
 111       old = NULL;
 112    }
 113
 114    if (pipe_reference(&old->reference, &fence->reference)) {
 115       swr_fence_finish(screen, NULL, (struct pipe_fence_handle *) old, 0);
 116       swr_fence_destroy(old);
 117    }
 118 }
 119
 120
 121 /*
 122  * Wait for the fence to finish.
 123  */
 124 boolean
 125 swr_fence_finish(struct pipe_screen *screen,
 126                  struct pipe_context *ctx,
 127                  struct pipe_fence_handle *fence_handle,
 128                  uint64_t timeout)
 129 {
 130    while (!swr_is_fence_done(fence_handle))
 131       sched_yield();
 132
 133    swr_fence(fence_handle)->pending = FALSE;
 134
 135    return TRUE;
 136 }
 137
 138
 139 uint64_t
 140 swr_get_timestamp(struct pipe_screen *screen)
 141 {
 142    return os_time_get_nano();
 143 }
 144
 145
 146 void
 147 swr_fence_init(struct pipe_screen *p_screen)
 148 {
 149    p_screen->fence_reference = swr_fence_reference;
 150    p_screen->fence_finish = swr_fence_finish;
 151    p_screen->get_timestamp = swr_get_timestamp;
 152
 153    /* Create persistant StoreTiles "flush" fence, used to signal completion
 154     * of flushing tile state back to resource texture, via StoreTiles. */
 155    struct swr_screen *screen = swr_screen(p_screen);
 156    screen->flush_fence = swr_fence_create();
 157 }