1/*
2 * Copyright © 2008 Intel Corporation
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 * Authors:
24 *    Eric Anholt <eric@anholt.net>
25 *
26 */
27
28/** @file intel_syncobj.c
29 *
30 * Support for ARB_sync
31 *
32 * ARB_sync is implemented by flushing the current batchbuffer and keeping a
33 * reference on it.  We can then check for completion or wait for completion
34 * using the normal buffer object mechanisms.  This does mean that if an
35 * application is using many sync objects, it will emit small batchbuffers
36 * which may end up being a significant overhead.  In other tests of removing
37 * gratuitous batchbuffer syncs in Mesa, it hasn't appeared to be a significant
38 * performance bottleneck, though.
39 */
40
41#include "main/simple_list.h"
42#include "main/imports.h"
43
44#include "intel_context.h"
45#include "intel_batchbuffer.h"
46#include "intel_reg.h"
47
48static struct gl_sync_object *
49intel_new_sync_object(struct gl_context *ctx, GLuint id)
50{
51   struct intel_sync_object *sync;
52
53   sync = calloc(1, sizeof(struct intel_sync_object));
54
55   return &sync->Base;
56}
57
58static void
59intel_delete_sync_object(struct gl_context *ctx, struct gl_sync_object *s)
60{
61   struct intel_sync_object *sync = (struct intel_sync_object *)s;
62
63   drm_intel_bo_unreference(sync->bo);
64   free(sync);
65}
66
67static void
68intel_fence_sync(struct gl_context *ctx, struct gl_sync_object *s,
69	       GLenum condition, GLbitfield flags)
70{
71   struct intel_context *intel = intel_context(ctx);
72   struct intel_sync_object *sync = (struct intel_sync_object *)s;
73
74   assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE);
75   intel_batchbuffer_emit_mi_flush(intel);
76
77   sync->bo = intel->batch.bo;
78   drm_intel_bo_reference(sync->bo);
79
80   intel_flush(ctx);
81}
82
83/* We ignore the user-supplied timeout.  This is weaselly -- we're allowed to
84 * round to an implementation-dependent accuracy, and right now our
85 * implementation "rounds" to the wait-forever value.
86 *
87 * The fix would be a new kernel function to do the GTT transition with a
88 * timeout.
89 */
90static void intel_client_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
91				 GLbitfield flags, GLuint64 timeout)
92{
93   struct intel_sync_object *sync = (struct intel_sync_object *)s;
94
95   if (sync->bo) {
96      drm_intel_bo_wait_rendering(sync->bo);
97      s->StatusFlag = 1;
98      drm_intel_bo_unreference(sync->bo);
99      sync->bo = NULL;
100   }
101}
102
103/* We have nothing to do for WaitSync.  Our GL command stream is sequential,
104 * so given that the sync object has already flushed the batchbuffer,
105 * any batchbuffers coming after this waitsync will naturally not occur until
106 * the previous one is done.
107 */
108static void intel_server_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
109				 GLbitfield flags, GLuint64 timeout)
110{
111}
112
113static void intel_check_sync(struct gl_context *ctx, struct gl_sync_object *s)
114{
115   struct intel_sync_object *sync = (struct intel_sync_object *)s;
116
117   if (sync->bo && !drm_intel_bo_busy(sync->bo)) {
118      drm_intel_bo_unreference(sync->bo);
119      sync->bo = NULL;
120      s->StatusFlag = 1;
121   }
122}
123
124void intel_init_syncobj_functions(struct dd_function_table *functions)
125{
126   functions->NewSyncObject = intel_new_sync_object;
127   functions->DeleteSyncObject = intel_delete_sync_object;
128   functions->FenceSync = intel_fence_sync;
129   functions->CheckSync = intel_check_sync;
130   functions->ClientWaitSync = intel_client_wait_sync;
131   functions->ServerWaitSync = intel_server_wait_sync;
132}
133