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 *
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
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
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