1/*
2 *      Copyright (C) 1995-1997 Claus-Justus Heine.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; see the file COPYING.  If not, write to
16 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
17
18 *
19 * $Source: /home/user/PROJECT/WL-520gu-NewUI/src/linux/linux/drivers/char/ftape/zftape/zftape-buffers.c,v $
20 * $Revision: 1.1.1.1 $
21 * $Date: 2008/10/15 03:26:29 $
22 *
23 *      This file contains the dynamic buffer allocation routines
24 *      of zftape
25 */
26
27#include <linux/errno.h>
28#include <linux/mm.h>
29#include <linux/slab.h>
30#include <asm/segment.h>
31
32#include <linux/zftape.h>
33
34#if LINUX_VERSION_CODE >= KERNEL_VER(2,1,0)
35#include <linux/vmalloc.h>
36#endif
37
38#include "../zftape/zftape-init.h"
39#include "../zftape/zftape-eof.h"
40#include "../zftape/zftape-ctl.h"
41#include "../zftape/zftape-write.h"
42#include "../zftape/zftape-read.h"
43#include "../zftape/zftape-rw.h"
44#include "../zftape/zftape-vtbl.h"
45
46/*  global variables
47 */
48
49/*  local varibales
50 */
51static unsigned int used_memory;
52static unsigned int peak_memory;
53
54void zft_memory_stats(void)
55{
56	TRACE_FUN(ft_t_flow);
57
58	TRACE(ft_t_noise, "Memory usage (vmalloc allocations):\n"
59	      KERN_INFO "total allocated: %d\n"
60	      KERN_INFO "peak allocation: %d",
61	      used_memory, peak_memory);
62	peak_memory = used_memory;
63	TRACE_EXIT;
64}
65
66int zft_vcalloc_once(void *new, size_t size)
67{
68	TRACE_FUN(ft_t_flow);
69	if (zft_vmalloc_once(new, size) < 0) {
70		TRACE_EXIT -ENOMEM;
71	}
72	memset(*(void **)new, '\0', size);
73	TRACE_EXIT 0;
74}
75int zft_vmalloc_once(void *new, size_t size)
76{
77	TRACE_FUN(ft_t_flow);
78
79	if (*(void **)new != NULL || size == 0) {
80		TRACE_EXIT 0;
81	}
82	if ((*(void **)new = vmalloc(size)) == NULL) {
83		TRACE_EXIT -ENOMEM;
84	}
85	used_memory += size;
86	if (peak_memory < used_memory) {
87		peak_memory = used_memory;
88	}
89	TRACE_ABORT(0, ft_t_noise,
90		    "allocated buffer @ %p, %d bytes", *(void **)new, size);
91}
92int zft_vcalloc_always(void *new, size_t size)
93{
94	TRACE_FUN(ft_t_flow);
95
96	zft_vfree(new, size);
97	TRACE_EXIT zft_vcalloc_once(new, size);
98}
99int zft_vmalloc_always(void *new, size_t size)
100{
101	TRACE_FUN(ft_t_flow);
102
103	zft_vfree(new, size);
104	TRACE_EXIT zft_vmalloc_once(new, size);
105}
106void zft_vfree(void *old, size_t size)
107{
108	TRACE_FUN(ft_t_flow);
109
110	if (*(void **)old) {
111		vfree(*(void **)old);
112		used_memory -= size;
113		TRACE(ft_t_noise, "released buffer @ %p, %d bytes",
114		      *(void **)old, size);
115		*(void **)old = NULL;
116	}
117	TRACE_EXIT;
118}
119
120void *zft_kmalloc(size_t size)
121{
122	void *new;
123
124	while ((new = kmalloc(size, GFP_KERNEL)) == NULL) {
125		current->state   = TASK_INTERRUPTIBLE;
126		schedule_timeout(HZ/10);
127	}
128	memset(new, 0, size);
129	used_memory += size;
130	if (peak_memory < used_memory) {
131		peak_memory = used_memory;
132	}
133	return new;
134}
135
136void zft_kfree(void *old, size_t size)
137{
138	kfree(old);
139	used_memory -= size;
140}
141
142/* there are some more buffers that are allocated on demand.
143 * cleanup_module() calles this function to be sure to have released
144 * them
145 */
146void zft_uninit_mem(void)
147{
148	TRACE_FUN(ft_t_flow);
149
150	zft_vfree(&zft_hseg_buf, FT_SEGMENT_SIZE);
151	zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE); zft_deblock_segment = -1;
152	zft_free_vtbl();
153	if (zft_cmpr_lock(0 /* don't load */) == 0) {
154		(*zft_cmpr_ops->cleanup)();
155		(*zft_cmpr_ops->reset)(); /* unlock it again */
156	}
157	zft_memory_stats();
158	TRACE_EXIT;
159}
160