1/*
2 * Copyright (C) 2009-2010 Francisco Jerez.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 *
25 */
26
27#include "nouveau_driver.h"
28#include "nouveau_context.h"
29
30/*
31 * Returns a pointer to a chunk of 'size' bytes long GART memory. 'bo'
32 * and 'offset' will point to the returned memory.
33 */
34void *
35nouveau_get_scratch(struct gl_context *ctx, unsigned size,
36		    struct nouveau_bo **bo, unsigned *offset)
37{
38	struct nouveau_client *client = context_client(ctx);
39	struct nouveau_scratch_state *scratch =
40		&to_nouveau_context(ctx)->scratch;
41	void *buf;
42
43	if (scratch->buf && size <= NOUVEAU_SCRATCH_SIZE - scratch->offset) {
44		nouveau_bo_ref(scratch->bo[scratch->index], bo);
45
46		buf = scratch->buf + scratch->offset;
47		*offset = scratch->offset;
48		scratch->offset += size;
49
50	} else if (size <= NOUVEAU_SCRATCH_SIZE) {
51		scratch->index = (scratch->index + 1) % NOUVEAU_SCRATCH_COUNT;
52		nouveau_bo_ref(scratch->bo[scratch->index], bo);
53
54		nouveau_bo_map(*bo, NOUVEAU_BO_WR, client);
55		buf = scratch->buf = (*bo)->map;
56
57		*offset = 0;
58		scratch->offset = size;
59
60	} else {
61		nouveau_bo_new(context_dev(ctx), NOUVEAU_BO_GART |
62			       NOUVEAU_BO_MAP, 0, size, NULL, bo);
63
64		nouveau_bo_map(*bo, NOUVEAU_BO_WR, client);
65		buf = (*bo)->map;
66
67		*offset = 0;
68	}
69
70	return buf;
71}
72
73void
74nouveau_scratch_init(struct gl_context *ctx)
75{
76	struct nouveau_scratch_state *scratch =
77		&to_nouveau_context(ctx)->scratch;
78	int ret, i;
79
80	for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++) {
81		ret = nouveau_bo_new(context_dev(ctx), NOUVEAU_BO_GART |
82				     NOUVEAU_BO_MAP, 0, NOUVEAU_SCRATCH_SIZE,
83				     NULL, &scratch->bo[i]);
84		assert(!ret);
85	}
86}
87
88void
89nouveau_scratch_destroy(struct gl_context *ctx)
90{
91	struct nouveau_scratch_state *scratch =
92		&to_nouveau_context(ctx)->scratch;
93	int i;
94
95	for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++)
96		nouveau_bo_ref(NULL, &scratch->bo[i]);
97}
98