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 */
34 void *
nouveau_get_scratch(struct gl_context * ctx,unsigned size,struct nouveau_bo ** bo,unsigned * offset)35 nouveau_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
73 void
nouveau_scratch_init(struct gl_context * ctx)74 nouveau_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
88 void
nouveau_scratch_destroy(struct gl_context * ctx)89 nouveau_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