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