1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*-
13 * Copyright (c) 2019 Chelsio Communications, Inc.
14 * All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #include <sys/types.h>
39 #include <sys/param.h>
40
41 #ifdef _KERNEL
42 #include "common/common.h"
43 #else
44 #include <stdio.h>
45 #include <string.h>
46 #endif
47 #include "cudbg.h"
48 #include "cudbg_lib_common.h"
49
50 int
get_scratch_buff(struct cudbg_buffer * pdbg_buff,u32 size,struct cudbg_buffer * pscratch_buff)51 get_scratch_buff(struct cudbg_buffer *pdbg_buff, u32 size,
52 struct cudbg_buffer *pscratch_buff)
53 {
54 u32 scratch_offset;
55 int rc = 0;
56
57 scratch_offset = pdbg_buff->size - size;
58
59 if (pdbg_buff->offset > (int)scratch_offset || pdbg_buff->size < size) {
60 rc = CUDBG_STATUS_NO_SCRATCH_MEM;
61 goto err;
62 } else {
63 pscratch_buff->data = (char *)pdbg_buff->data + scratch_offset;
64 pscratch_buff->offset = 0;
65 pscratch_buff->size = size;
66 pdbg_buff->size -= size;
67 }
68
69 err:
70 return rc;
71 }
72
73 void
release_scratch_buff(struct cudbg_buffer * pscratch_buff,struct cudbg_buffer * pdbg_buff)74 release_scratch_buff(struct cudbg_buffer *pscratch_buff,
75 struct cudbg_buffer *pdbg_buff)
76 {
77 pdbg_buff->size += pscratch_buff->size;
78 /* Reset the used buffer to zero.
79 * If we dont do this, then it will effect the ext entity logic.
80 */
81 memset(pscratch_buff->data, 0, pscratch_buff->size);
82 pscratch_buff->data = NULL;
83 pscratch_buff->offset = 0;
84 pscratch_buff->size = 0;
85 }
86