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"),
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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
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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 "os/os_time.h"
  27
  28 #include "swr_context.h"
  29 #include "swr_screen.h"
  30 #include "swr_fence.h"
  31
  32 #if defined(PIPE_CC_MSVC) // portable thread yield
  33    #define sched_yield SwitchToThread
  34 #endif
  35
  36 /*
  37  * Fence callback, called by back-end thread on completion of all rendering up
  38  * to SwrSync call.
  39  */
  40 static void
  41 swr_fence_cb(uint64_t userData, uint64_t userData2, uint64_t userData3)
  42 {
  43    struct swr_fence *fence = (struct swr_fence *)userData;
  44
  45    /* Complete all work attached to the fence */
  46    swr_fence_do_work(fence);
  47
  48    /* Correct value is in SwrSync data, and not the fence write field. */
  49    fence->read = userData2;
  50 }
  51
  52 /*
  53  * Submit an existing fence.
  54  */
  55 void
  56 swr_fence_submit(struct swr_context *ctx, struct pipe_fence_handle *fh)
  57 {
  58    struct swr_fence *fence = swr_fence(fh);
  59
  60    fence->write++;
  61    fence->pending = TRUE;
  62    SwrSync(ctx->swrContext, swr_fence_cb, (uint64_t)fence, fence->write, 0);
  63 }
  64
  65 /*
  66  * Create a new fence object.
  67  */
  68 struct pipe_fence_handle *
  69 swr_fence_create()
  70 {
  71    static int fence_id = 0;
  72    struct swr_fence *fence = CALLOC_STRUCT(swr_fence);
  73    if (!fence)
  74       return NULL;
  75
  76    pipe_reference_init(&fence->reference, 1);
  77    fence->id = fence_id++;
  78    fence->work.tail = &fence->work.head;
  79
  80    return (struct pipe_fence_handle *)fence;
  81 }
  82
  83 /** Destroy a fence.  Called when refcount hits zero. */
  84 static void
  85 swr_fence_destroy(struct swr_fence *fence)
  86 {
  87    /* Complete any work left if fence was not submitted */
  88    swr_fence_do_work(fence);
  89    FREE(fence);
  90 }
  91
  92 /**
  93  * Set ptr = fence, with reference counting
  94  */
  95 void
  96 swr_fence_reference(struct pipe_screen *screen,
  97                     struct pipe_fence_handle **ptr,
  98                     struct pipe_fence_handle *f)
  99 {
 100    struct swr_fence *fence = swr_fence(f);
 101    struct swr_fence *old;
 102
 103    if (likely(ptr)) {
 104       old = swr_fence(*ptr);
 105       *ptr = f;
 106    } else {
 107       old = NULL;
 108    }
 109
 110    if (pipe_reference(&old->reference, &fence->reference)) {
 111       swr_fence_finish(screen, NULL, (struct pipe_fence_handle *) old, 0);
 112       swr_fence_destroy(old);
 113    }
 114 }
 115
 116
 117 /*
 118  * Wait for the fence to finish.
 119  */
 120 boolean
 121 swr_fence_finish(struct pipe_screen *screen,
 122                  struct pipe_context *ctx,
 123                  struct pipe_fence_handle *fence_handle,
 124                  uint64_t timeout)
 125 {
 126    while (!swr_is_fence_done(fence_handle))
 127       sched_yield();
 128
 129    swr_fence(fence_handle)->pending = FALSE;
 130
 131    return TRUE;
 132 }
 133
 134
 135 uint64_t
 136 swr_get_timestamp(struct pipe_screen *screen)
 137 {
 138    return os_time_get_nano();
 139 }
 140
 141
 142 void
 143 swr_fence_init(struct pipe_screen *p_screen)
 144 {
 145    p_screen->fence_reference = swr_fence_reference;
 146    p_screen->fence_finish = swr_fence_finish;
 147    p_screen->get_timestamp = swr_get_timestamp;
 148
 149    /* Create persistant StoreTiles "flush" fence, used to signal completion
 150     * of flushing tile state back to resource texture, via StoreTiles. */
 151    struct swr_screen *screen = swr_screen(p_screen);
 152    screen->flush_fence = swr_fence_create();
 153 }