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
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   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
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  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    /* Contexts may not finish in order, but fence value always increases */
  54    if (fence->read < userData2)
  55       fence->read = userData2;
  56 }
  57
  58 /*
  59  * Submit an existing fence.
  60  */
  61 void
  62 swr_fence_submit(struct swr_context *ctx, struct pipe_fence_handle *fh)
  63 {
  64    struct swr_fence *fence = swr_fence(fh);
  65
  66    fence->write++;
  67    fence->pending = TRUE;
  68    ctx->api.pfnSwrSync(ctx->swrContext, swr_fence_cb, (uint64_t)fence, fence->write, 0);
  69 }
  70
  71 /*
  72  * Create a new fence object.
  73  */
  74 struct pipe_fence_handle *
  75 swr_fence_create()
  76 {
  77    static int fence_id = 0;
  78    struct swr_fence *fence = CALLOC_STRUCT(swr_fence);
  79    if (!fence)
  80       return NULL;
  81
  82    pipe_reference_init(&fence->reference, 1);
  83    fence->id = fence_id++;
  84    fence->work.tail = &fence->work.head;
  85
  86    return (struct pipe_fence_handle *)fence;
  87 }
  88
  89 /** Destroy a fence.  Called when refcount hits zero. */
  90 static void
  91 swr_fence_destroy(struct swr_fence *fence)
  92 {
  93    /* Complete any work left if fence was not submitted */
  94    swr_fence_do_work(fence);
  95    FREE(fence);
  96 }
  97
  98 /**
  99  * Set ptr = fence, with reference counting
 100  */
 101 void
 102 swr_fence_reference(struct pipe_screen *screen,
 103                     struct pipe_fence_handle **ptr,
 104                     struct pipe_fence_handle *f)
 105 {
 106    struct swr_fence *fence = swr_fence(f);
 107    struct swr_fence *old;
 108
 109    if (likely(ptr)) {
 110       old = swr_fence(*ptr);
 111       *ptr = f;
 112    } else {
 113       old = NULL;
 114    }
 115
 116    if (pipe_reference(&old->reference, &fence->reference)) {
 117       swr_fence_finish(screen, NULL, (struct pipe_fence_handle *) old, 0);
 118       swr_fence_destroy(old);
 119    }
 120 }
 121
 122
 123 /*
 124  * Wait for the fence to finish.
 125  */
 126 bool
 127 swr_fence_finish(struct pipe_screen *screen,
 128                  struct pipe_context *ctx,
 129                  struct pipe_fence_handle *fence_handle,
 130                  uint64_t timeout)
 131 {
 132    while (!swr_is_fence_done(fence_handle))
 133       sched_yield();
 134
 135    swr_fence(fence_handle)->pending = FALSE;
 136
 137    return TRUE;
 138 }
 139
 140
 141 uint64_t
 142 swr_get_timestamp(struct pipe_screen *screen)
 143 {
 144    return os_time_get_nano();
 145 }
 146
 147
 148 void
 149 swr_fence_init(struct pipe_screen *p_screen)
 150 {
 151    p_screen->fence_reference = swr_fence_reference;
 152    p_screen->fence_finish = swr_fence_finish;
 153    p_screen->get_timestamp = swr_get_timestamp;
 154
 155    /* Create persistant StoreTiles "flush" fence, used to signal completion
 156     * of flushing tile state back to resource texture, via StoreTiles. */
 157    struct swr_screen *screen = swr_screen(p_screen);
 158    screen->flush_fence = swr_fence_create();
 159 }