Commit | Line | Data |
---|---|---|
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 | */ | |
49 | static int procctl_frv_cachemode(ctl_table *table, int write, struct file *filp, | |
7ab76d72 | 50 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
51 | { |
52 | unsigned long hsr0; | |
53 | char buff[8]; | |
54 | int len; | |
55 | ||
56 | len = *lenp; | |
57 | ||
58 | if (write) { | |
59 | /* potential state change */ | |
60 | if (len <= 1 || len > sizeof(buff) - 1) | |
61 | return -EINVAL; | |
62 | ||
63 | if (copy_from_user(buff, buffer, len) != 0) | |
64 | return -EFAULT; | |
65 | ||
66 | if (buff[len - 1] == '\n') | |
67 | buff[len - 1] = '\0'; | |
68 | else | |
69 | buff[len] = '\0'; | |
70 | ||
71 | if (strcmp(buff, frv_cache_wback) == 0) { | |
72 | /* switch dcache into write-back mode */ | |
73 | frv_change_dcache_mode(HSR0_CBM_COPY_BACK); | |
74 | return 0; | |
75 | } | |
76 | ||
77 | if (strcmp(buff, frv_cache_wthru) == 0) { | |
78 | /* switch dcache into write-through mode */ | |
79 | frv_change_dcache_mode(HSR0_CBM_WRITE_THRU); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | return -EINVAL; | |
84 | } | |
85 | ||
86 | /* read the state */ | |
87 | if (filp->f_pos > 0) { | |
88 | *lenp = 0; | |
89 | return 0; | |
90 | } | |
91 | ||
92 | hsr0 = __get_HSR(0); | |
93 | switch (hsr0 & HSR0_CBM) { | |
94 | case HSR0_CBM_WRITE_THRU: | |
95 | memcpy(buff, frv_cache_wthru, sizeof(frv_cache_wthru) - 1); | |
96 | buff[sizeof(frv_cache_wthru) - 1] = '\n'; | |
97 | len = sizeof(frv_cache_wthru); | |
98 | break; | |
99 | default: | |
100 | memcpy(buff, frv_cache_wback, sizeof(frv_cache_wback) - 1); | |
101 | buff[sizeof(frv_cache_wback) - 1] = '\n'; | |
102 | len = sizeof(frv_cache_wback); | |
103 | break; | |
104 | } | |
105 | ||
106 | if (len > *lenp) | |
107 | len = *lenp; | |
108 | ||
109 | if (copy_to_user(buffer, buff, len) != 0) | |
110 | return -EFAULT; | |
111 | ||
112 | *lenp = len; | |
113 | filp->f_pos = len; | |
114 | return 0; | |
115 | ||
116 | } /* end procctl_frv_cachemode() */ | |
117 | ||
118 | /*****************************************************************************/ | |
119 | /* | |
120 | * permit the mm_struct the nominated process is using have its MMU context ID pinned | |
121 | */ | |
122 | #ifdef CONFIG_MMU | |
123 | static int procctl_frv_pin_cxnr(ctl_table *table, int write, struct file *filp, | |
7ab76d72 | 124 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
125 | { |
126 | pid_t pid; | |
127 | char buff[16], *p; | |
128 | int len; | |
129 | ||
130 | len = *lenp; | |
131 | ||
132 | if (write) { | |
133 | /* potential state change */ | |
134 | if (len <= 1 || len > sizeof(buff) - 1) | |
135 | return -EINVAL; | |
136 | ||
137 | if (copy_from_user(buff, buffer, len) != 0) | |
138 | return -EFAULT; | |
139 | ||
140 | if (buff[len - 1] == '\n') | |
141 | buff[len - 1] = '\0'; | |
142 | else | |
143 | buff[len] = '\0'; | |
144 | ||
145 | pid = simple_strtoul(buff, &p, 10); | |
146 | if (*p) | |
147 | return -EINVAL; | |
148 | ||
149 | return cxn_pin_by_pid(pid); | |
150 | } | |
151 | ||
152 | /* read the currently pinned CXN */ | |
153 | if (filp->f_pos > 0) { | |
154 | *lenp = 0; | |
155 | return 0; | |
156 | } | |
157 | ||
158 | len = snprintf(buff, sizeof(buff), "%d\n", cxn_pinned); | |
159 | if (len > *lenp) | |
160 | len = *lenp; | |
161 | ||
162 | if (copy_to_user(buffer, buff, len) != 0) | |
163 | return -EFAULT; | |
164 | ||
165 | *lenp = len; | |
166 | filp->f_pos = len; | |
167 | return 0; | |
168 | ||
169 | } /* end procctl_frv_pin_cxnr() */ | |
170 | #endif | |
171 | ||
172 | /* | |
173 | * FR-V specific sysctls | |
174 | */ | |
175 | static struct ctl_table frv_table[] = | |
176 | { | |
317ed68c | 177 | { |
317ed68c EB |
178 | .procname = "cache-mode", |
179 | .data = NULL, | |
180 | .maxlen = 0, | |
181 | .mode = 0644, | |
6d456111 | 182 | .proc_handler = procctl_frv_cachemode, |
317ed68c | 183 | }, |
1da177e4 | 184 | #ifdef CONFIG_MMU |
317ed68c | 185 | { |
317ed68c EB |
186 | .procname = "pin-cxnr", |
187 | .data = NULL, | |
188 | .maxlen = 0, | |
189 | .mode = 0644, | |
6d456111 | 190 | .proc_handler = procctl_frv_pin_cxnr |
317ed68c | 191 | }, |
1da177e4 | 192 | #endif |
317ed68c | 193 | {} |
1da177e4 LT |
194 | }; |
195 | ||
196 | /* | |
197 | * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6 | |
198 | * when all the PM interfaces exist nicely. | |
199 | */ | |
1da177e4 LT |
200 | static struct ctl_table frv_dir_table[] = |
201 | { | |
317ed68c | 202 | { |
317ed68c EB |
203 | .procname = "frv", |
204 | .mode = 0555, | |
205 | .child = frv_table | |
206 | }, | |
207 | {} | |
1da177e4 LT |
208 | }; |
209 | ||
210 | /* | |
211 | * Initialize power interface | |
212 | */ | |
213 | static int __init frv_sysctl_init(void) | |
214 | { | |
0b4d4147 | 215 | register_sysctl_table(frv_dir_table); |
1da177e4 LT |
216 | return 0; |
217 | } | |
218 | ||
219 | __initcall(frv_sysctl_init); |