Commit | Line | Data |
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1da177e4 LT |
1 | /* sysctl.c: implementation of /proc/sys files relating to FRV specifically |
2 | * | |
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/sysctl.h> |
13 | #include <linux/proc_fs.h> | |
14 | #include <linux/init.h> | |
15 | #include <asm/uaccess.h> | |
16 | ||
17 | static const char frv_cache_wback[] = "wback"; | |
18 | static const char frv_cache_wthru[] = "wthru"; | |
19 | ||
20 | static void frv_change_dcache_mode(unsigned long newmode) | |
21 | { | |
22 | unsigned long flags, hsr0; | |
23 | ||
24 | local_irq_save(flags); | |
25 | ||
26 | hsr0 = __get_HSR(0); | |
27 | hsr0 &= ~HSR0_DCE; | |
28 | __set_HSR(0, hsr0); | |
29 | ||
30 | asm volatile(" dcef @(gr0,gr0),#1 \n" | |
31 | " membar \n" | |
32 | : : : "memory" | |
33 | ); | |
34 | ||
35 | hsr0 = (hsr0 & ~HSR0_CBM) | newmode; | |
36 | __set_HSR(0, hsr0); | |
37 | hsr0 |= HSR0_DCE; | |
38 | __set_HSR(0, hsr0); | |
39 | ||
40 | local_irq_restore(flags); | |
41 | ||
42 | //printk("HSR0 now %08lx\n", hsr0); | |
43 | } | |
44 | ||
45 | /*****************************************************************************/ | |
46 | /* | |
47 | * handle requests to dynamically switch the write caching mode delivered by /proc | |
48 | */ | |
adc88ffc | 49 | static int procctl_frv_cachemode(struct ctl_table *table, int write, |
fc244475 JB |
50 | void __user *buffer, size_t *lenp, |
51 | loff_t *ppos) | |
1da177e4 LT |
52 | { |
53 | unsigned long hsr0; | |
54 | char buff[8]; | |
55 | int len; | |
56 | ||
57 | len = *lenp; | |
58 | ||
59 | if (write) { | |
60 | /* potential state change */ | |
61 | if (len <= 1 || len > sizeof(buff) - 1) | |
62 | return -EINVAL; | |
63 | ||
64 | if (copy_from_user(buff, buffer, len) != 0) | |
65 | return -EFAULT; | |
66 | ||
67 | if (buff[len - 1] == '\n') | |
68 | buff[len - 1] = '\0'; | |
69 | else | |
70 | buff[len] = '\0'; | |
71 | ||
72 | if (strcmp(buff, frv_cache_wback) == 0) { | |
73 | /* switch dcache into write-back mode */ | |
74 | frv_change_dcache_mode(HSR0_CBM_COPY_BACK); | |
75 | return 0; | |
76 | } | |
77 | ||
78 | if (strcmp(buff, frv_cache_wthru) == 0) { | |
79 | /* switch dcache into write-through mode */ | |
80 | frv_change_dcache_mode(HSR0_CBM_WRITE_THRU); | |
81 | return 0; | |
82 | } | |
83 | ||
84 | return -EINVAL; | |
85 | } | |
86 | ||
87 | /* read the state */ | |
fc244475 | 88 | if (*ppos > 0) { |
1da177e4 LT |
89 | *lenp = 0; |
90 | return 0; | |
91 | } | |
92 | ||
93 | hsr0 = __get_HSR(0); | |
94 | switch (hsr0 & HSR0_CBM) { | |
95 | case HSR0_CBM_WRITE_THRU: | |
96 | memcpy(buff, frv_cache_wthru, sizeof(frv_cache_wthru) - 1); | |
97 | buff[sizeof(frv_cache_wthru) - 1] = '\n'; | |
98 | len = sizeof(frv_cache_wthru); | |
99 | break; | |
100 | default: | |
101 | memcpy(buff, frv_cache_wback, sizeof(frv_cache_wback) - 1); | |
102 | buff[sizeof(frv_cache_wback) - 1] = '\n'; | |
103 | len = sizeof(frv_cache_wback); | |
104 | break; | |
105 | } | |
106 | ||
107 | if (len > *lenp) | |
108 | len = *lenp; | |
109 | ||
110 | if (copy_to_user(buffer, buff, len) != 0) | |
111 | return -EFAULT; | |
112 | ||
113 | *lenp = len; | |
fc244475 | 114 | *ppos = len; |
1da177e4 LT |
115 | return 0; |
116 | ||
117 | } /* end procctl_frv_cachemode() */ | |
118 | ||
119 | /*****************************************************************************/ | |
120 | /* | |
121 | * permit the mm_struct the nominated process is using have its MMU context ID pinned | |
122 | */ | |
123 | #ifdef CONFIG_MMU | |
adc88ffc | 124 | static int procctl_frv_pin_cxnr(struct ctl_table *table, int write, |
fc244475 JB |
125 | void __user *buffer, size_t *lenp, |
126 | loff_t *ppos) | |
1da177e4 LT |
127 | { |
128 | pid_t pid; | |
129 | char buff[16], *p; | |
130 | int len; | |
131 | ||
132 | len = *lenp; | |
133 | ||
134 | if (write) { | |
135 | /* potential state change */ | |
136 | if (len <= 1 || len > sizeof(buff) - 1) | |
137 | return -EINVAL; | |
138 | ||
139 | if (copy_from_user(buff, buffer, len) != 0) | |
140 | return -EFAULT; | |
141 | ||
142 | if (buff[len - 1] == '\n') | |
143 | buff[len - 1] = '\0'; | |
144 | else | |
145 | buff[len] = '\0'; | |
146 | ||
147 | pid = simple_strtoul(buff, &p, 10); | |
148 | if (*p) | |
149 | return -EINVAL; | |
150 | ||
151 | return cxn_pin_by_pid(pid); | |
152 | } | |
153 | ||
154 | /* read the currently pinned CXN */ | |
fc244475 | 155 | if (*ppos > 0) { |
1da177e4 LT |
156 | *lenp = 0; |
157 | return 0; | |
158 | } | |
159 | ||
160 | len = snprintf(buff, sizeof(buff), "%d\n", cxn_pinned); | |
161 | if (len > *lenp) | |
162 | len = *lenp; | |
163 | ||
164 | if (copy_to_user(buffer, buff, len) != 0) | |
165 | return -EFAULT; | |
166 | ||
167 | *lenp = len; | |
fc244475 | 168 | *ppos = len; |
1da177e4 LT |
169 | return 0; |
170 | ||
171 | } /* end procctl_frv_pin_cxnr() */ | |
172 | #endif | |
173 | ||
174 | /* | |
175 | * FR-V specific sysctls | |
176 | */ | |
177 | static struct ctl_table frv_table[] = | |
178 | { | |
317ed68c | 179 | { |
317ed68c EB |
180 | .procname = "cache-mode", |
181 | .data = NULL, | |
182 | .maxlen = 0, | |
183 | .mode = 0644, | |
6d456111 | 184 | .proc_handler = procctl_frv_cachemode, |
317ed68c | 185 | }, |
1da177e4 | 186 | #ifdef CONFIG_MMU |
317ed68c | 187 | { |
317ed68c EB |
188 | .procname = "pin-cxnr", |
189 | .data = NULL, | |
190 | .maxlen = 0, | |
191 | .mode = 0644, | |
6d456111 | 192 | .proc_handler = procctl_frv_pin_cxnr |
317ed68c | 193 | }, |
1da177e4 | 194 | #endif |
317ed68c | 195 | {} |
1da177e4 LT |
196 | }; |
197 | ||
198 | /* | |
199 | * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6 | |
200 | * when all the PM interfaces exist nicely. | |
201 | */ | |
1da177e4 LT |
202 | static struct ctl_table frv_dir_table[] = |
203 | { | |
317ed68c | 204 | { |
317ed68c EB |
205 | .procname = "frv", |
206 | .mode = 0555, | |
207 | .child = frv_table | |
208 | }, | |
209 | {} | |
1da177e4 LT |
210 | }; |
211 | ||
212 | /* | |
213 | * Initialize power interface | |
214 | */ | |
215 | static int __init frv_sysctl_init(void) | |
216 | { | |
0b4d4147 | 217 | register_sysctl_table(frv_dir_table); |
1da177e4 LT |
218 | return 0; |
219 | } | |
220 | ||
221 | __initcall(frv_sysctl_init); |