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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | /* sysctl.c: implementation of /proc/sys files relating to FRV specifically * * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/slab.h> #include <linux/sysctl.h> #include <linux/proc_fs.h> #include <linux/init.h> #include <asm/uaccess.h> static const char frv_cache_wback[] = "wback"; static const char frv_cache_wthru[] = "wthru"; static void frv_change_dcache_mode(unsigned long newmode) { unsigned long flags, hsr0; local_irq_save(flags); hsr0 = __get_HSR(0); hsr0 &= ~HSR0_DCE; __set_HSR(0, hsr0); asm volatile(" dcef @(gr0,gr0),#1 \n" " membar \n" : : : "memory" ); hsr0 = (hsr0 & ~HSR0_CBM) | newmode; __set_HSR(0, hsr0); hsr0 |= HSR0_DCE; __set_HSR(0, hsr0); local_irq_restore(flags); //printk("HSR0 now %08lx\n", hsr0); } /*****************************************************************************/ /* * handle requests to dynamically switch the write caching mode delivered by /proc */ static int procctl_frv_cachemode(ctl_table *table, int write, struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos) { unsigned long hsr0; char buff[8]; int len; len = *lenp; if (write) { /* potential state change */ if (len <= 1 || len > sizeof(buff) - 1) return -EINVAL; if (copy_from_user(buff, buffer, len) != 0) return -EFAULT; if (buff[len - 1] == '\n') buff[len - 1] = '\0'; else buff[len] = '\0'; if (strcmp(buff, frv_cache_wback) == 0) { /* switch dcache into write-back mode */ frv_change_dcache_mode(HSR0_CBM_COPY_BACK); return 0; } if (strcmp(buff, frv_cache_wthru) == 0) { /* switch dcache into write-through mode */ frv_change_dcache_mode(HSR0_CBM_WRITE_THRU); return 0; } return -EINVAL; } /* read the state */ if (filp->f_pos > 0) { *lenp = 0; return 0; } hsr0 = __get_HSR(0); switch (hsr0 & HSR0_CBM) { case HSR0_CBM_WRITE_THRU: memcpy(buff, frv_cache_wthru, sizeof(frv_cache_wthru) - 1); buff[sizeof(frv_cache_wthru) - 1] = '\n'; len = sizeof(frv_cache_wthru); break; default: memcpy(buff, frv_cache_wback, sizeof(frv_cache_wback) - 1); buff[sizeof(frv_cache_wback) - 1] = '\n'; len = sizeof(frv_cache_wback); break; } if (len > *lenp) len = *lenp; if (copy_to_user(buffer, buff, len) != 0) return -EFAULT; *lenp = len; filp->f_pos = len; return 0; } /* end procctl_frv_cachemode() */ /*****************************************************************************/ /* * permit the mm_struct the nominated process is using have its MMU context ID pinned */ #ifdef CONFIG_MMU static int procctl_frv_pin_cxnr(ctl_table *table, int write, struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos) { pid_t pid; char buff[16], *p; int len; len = *lenp; if (write) { /* potential state change */ if (len <= 1 || len > sizeof(buff) - 1) return -EINVAL; if (copy_from_user(buff, buffer, len) != 0) return -EFAULT; if (buff[len - 1] == '\n') buff[len - 1] = '\0'; else buff[len] = '\0'; pid = simple_strtoul(buff, &p, 10); if (*p) return -EINVAL; return cxn_pin_by_pid(pid); } /* read the currently pinned CXN */ if (filp->f_pos > 0) { *lenp = 0; return 0; } len = snprintf(buff, sizeof(buff), "%d\n", cxn_pinned); if (len > *lenp) len = *lenp; if (copy_to_user(buffer, buff, len) != 0) return -EFAULT; *lenp = len; filp->f_pos = len; return 0; } /* end procctl_frv_pin_cxnr() */ #endif /* * FR-V specific sysctls */ static struct ctl_table frv_table[] = { { 1, "cache-mode", NULL, 0, 0644, NULL, &procctl_frv_cachemode }, #ifdef CONFIG_MMU { 2, "pin-cxnr", NULL, 0, 0644, NULL, &procctl_frv_pin_cxnr }, #endif { 0 } }; /* * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6 * when all the PM interfaces exist nicely. */ #define CTL_FRV 9898 static struct ctl_table frv_dir_table[] = { {CTL_FRV, "frv", NULL, 0, 0555, frv_table}, {0} }; /* * Initialize power interface */ static int __init frv_sysctl_init(void) { register_sysctl_table(frv_dir_table, 1); return 0; } __initcall(frv_sysctl_init); |