summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/intel/intel_syncobj.c
blob: 0d7889d3c258179bf74b6ee4ac28aeddbb79d805 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/*
 * Copyright © 2008 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

/** @file intel_syncobj.c
 *
 * Support for ARB_sync
 *
 * ARB_sync is implemented by flushing the current batchbuffer and keeping a
 * reference on it.  We can then check for completion or wait for compeltion
 * using the normal buffer object mechanisms.  This does mean that if an
 * application is using many sync objects, it will emit small batchbuffers
 * which may end up being a significant overhead.  In other tests of removing
 * gratuitous batchbuffer syncs in Mesa, it hasn't appeared to be a significant
 * performance bottleneck, though.
 */

#include "main/simple_list.h"
#include "main/imports.h"

#include "intel_context.h"
#include "intel_batchbuffer.h"
#include "intel_reg.h"

static struct gl_sync_object *
intel_new_sync_object(GLcontext *ctx, GLuint id)
{
   struct intel_sync_object *sync;

   sync = _mesa_calloc(sizeof(struct intel_sync_object));

   return &sync->Base;
}

static void
intel_delete_sync_object(GLcontext *ctx, struct gl_sync_object *s)
{
   struct intel_sync_object *sync = (struct intel_sync_object *)s;

   drm_intel_bo_unreference(sync->bo);
   _mesa_free(sync);
}

static void
intel_fence_sync(GLcontext *ctx, struct gl_sync_object *s,
	       GLenum condition, GLbitfield flags)
{
   struct intel_context *intel = intel_context(ctx);
   struct intel_sync_object *sync = (struct intel_sync_object *)s;

   assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE);
   intel_batchbuffer_emit_mi_flush(intel->batch);

   sync->bo = intel->batch->buf;
   drm_intel_bo_reference(sync->bo);

   intelFlush(ctx);
}

/* We ignore the user-supplied timeout.  This is weaselly -- we're allowed to
 * round to an implementation-dependent accuracy, and right now our
 * implementation "rounds" to the wait-forever value.
 *
 * The fix would be a new kernel function to do the GTT transition with a
 * timeout.
 */
static void intel_client_wait_sync(GLcontext *ctx, struct gl_sync_object *s,
				 GLbitfield flags, GLuint64 timeout)
{
   struct intel_sync_object *sync = (struct intel_sync_object *)s;

   if (sync->bo) {
      drm_intel_bo_wait_rendering(sync->bo);
      s->StatusFlag = 1;
      drm_intel_bo_unreference(sync->bo);
      sync->bo = NULL;
   }
}

/* We have nothing to do for WaitSync.  Our GL command stream is sequential,
 * so given that the sync object has already flushed the batchbuffer,
 * any batchbuffers coming after this waitsync will naturally not occur until
 * the previous one is done.
 */
static void intel_server_wait_sync(GLcontext *ctx, struct gl_sync_object *s,
				 GLbitfield flags, GLuint64 timeout)
{
}

static void intel_check_sync(GLcontext *ctx, struct gl_sync_object *s)
{
   struct intel_sync_object *sync = (struct intel_sync_object *)s;

   if (sync->bo && !drm_intel_bo_busy(sync->bo)) {
      drm_intel_bo_unreference(sync->bo);
      sync->bo = NULL;
      s->StatusFlag = 1;
   }
}

void intel_init_syncobj_functions(struct dd_function_table *functions)
{
   functions->NewSyncObject = intel_new_sync_object;
   functions->DeleteSyncObject = intel_delete_sync_object;
   functions->FenceSync = intel_fence_sync;
   functions->CheckSync = intel_check_sync;
   functions->ClientWaitSync = intel_client_wait_sync;
   functions->ServerWaitSync = intel_server_wait_sync;
}