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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/slab.h> |
13 | #include <linux/sysctl.h> | |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/init.h> | |
16 | #include <asm/uaccess.h> | |
17 | ||
18 | static const char frv_cache_wback[] = "wback"; | |
19 | static const char frv_cache_wthru[] = "wthru"; | |
20 | ||
21 | static void frv_change_dcache_mode(unsigned long newmode) | |
22 | { | |
23 | unsigned long flags, hsr0; | |
24 | ||
25 | local_irq_save(flags); | |
26 | ||
27 | hsr0 = __get_HSR(0); | |
28 | hsr0 &= ~HSR0_DCE; | |
29 | __set_HSR(0, hsr0); | |
30 | ||
31 | asm volatile(" dcef @(gr0,gr0),#1 \n" | |
32 | " membar \n" | |
33 | : : : "memory" | |
34 | ); | |
35 | ||
36 | hsr0 = (hsr0 & ~HSR0_CBM) | newmode; | |
37 | __set_HSR(0, hsr0); | |
38 | hsr0 |= HSR0_DCE; | |
39 | __set_HSR(0, hsr0); | |
40 | ||
41 | local_irq_restore(flags); | |
42 | ||
43 | //printk("HSR0 now %08lx\n", hsr0); | |
44 | } | |
45 | ||
46 | /*****************************************************************************/ | |
47 | /* | |
48 | * handle requests to dynamically switch the write caching mode delivered by /proc | |
49 | */ | |
50 | static int procctl_frv_cachemode(ctl_table *table, int write, struct file *filp, | |
7ab76d72 | 51 | void __user *buffer, size_t *lenp, 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 */ | |
88 | if (filp->f_pos > 0) { | |
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; | |
114 | filp->f_pos = len; | |
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 | |
124 | static int procctl_frv_pin_cxnr(ctl_table *table, int write, struct file *filp, | |
7ab76d72 | 125 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
126 | { |
127 | pid_t pid; | |
128 | char buff[16], *p; | |
129 | int len; | |
130 | ||
131 | len = *lenp; | |
132 | ||
133 | if (write) { | |
134 | /* potential state change */ | |
135 | if (len <= 1 || len > sizeof(buff) - 1) | |
136 | return -EINVAL; | |
137 | ||
138 | if (copy_from_user(buff, buffer, len) != 0) | |
139 | return -EFAULT; | |
140 | ||
141 | if (buff[len - 1] == '\n') | |
142 | buff[len - 1] = '\0'; | |
143 | else | |
144 | buff[len] = '\0'; | |
145 | ||
146 | pid = simple_strtoul(buff, &p, 10); | |
147 | if (*p) | |
148 | return -EINVAL; | |
149 | ||
150 | return cxn_pin_by_pid(pid); | |
151 | } | |
152 | ||
153 | /* read the currently pinned CXN */ | |
154 | if (filp->f_pos > 0) { | |
155 | *lenp = 0; | |
156 | return 0; | |
157 | } | |
158 | ||
159 | len = snprintf(buff, sizeof(buff), "%d\n", cxn_pinned); | |
160 | if (len > *lenp) | |
161 | len = *lenp; | |
162 | ||
163 | if (copy_to_user(buffer, buff, len) != 0) | |
164 | return -EFAULT; | |
165 | ||
166 | *lenp = len; | |
167 | filp->f_pos = len; | |
168 | return 0; | |
169 | ||
170 | } /* end procctl_frv_pin_cxnr() */ | |
171 | #endif | |
172 | ||
173 | /* | |
174 | * FR-V specific sysctls | |
175 | */ | |
176 | static struct ctl_table frv_table[] = | |
177 | { | |
317ed68c EB |
178 | { |
179 | .ctl_name = 1, | |
180 | .procname = "cache-mode", | |
181 | .data = NULL, | |
182 | .maxlen = 0, | |
183 | .mode = 0644, | |
184 | .proc_handler = &procctl_frv_cachemode, | |
185 | }, | |
1da177e4 | 186 | #ifdef CONFIG_MMU |
317ed68c EB |
187 | { |
188 | .ctl_name = 2, | |
189 | .procname = "pin-cxnr", | |
190 | .data = NULL, | |
191 | .maxlen = 0, | |
192 | .mode = 0644, | |
193 | .proc_handler = &procctl_frv_pin_cxnr | |
194 | }, | |
1da177e4 | 195 | #endif |
317ed68c | 196 | {} |
1da177e4 LT |
197 | }; |
198 | ||
199 | /* | |
200 | * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6 | |
201 | * when all the PM interfaces exist nicely. | |
202 | */ | |
1da177e4 LT |
203 | static struct ctl_table frv_dir_table[] = |
204 | { | |
317ed68c EB |
205 | { |
206 | .ctl_name = CTL_FRV, | |
207 | .procname = "frv", | |
208 | .mode = 0555, | |
209 | .child = frv_table | |
210 | }, | |
211 | {} | |
1da177e4 LT |
212 | }; |
213 | ||
214 | /* | |
215 | * Initialize power interface | |
216 | */ | |
217 | static int __init frv_sysctl_init(void) | |
218 | { | |
0b4d4147 | 219 | register_sysctl_table(frv_dir_table); |
1da177e4 LT |
220 | return 0; |
221 | } | |
222 | ||
223 | __initcall(frv_sysctl_init); |