Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 3 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Licensed under the GPL |
| 5 | */ |
| 6 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 7 | #include "linux/console.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include "linux/ctype.h" |
| 9 | #include "linux/interrupt.h" |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 10 | #include "linux/list.h" |
| 11 | #include "linux/mm.h" |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 12 | #include "linux/module.h" |
| 13 | #include "linux/notifier.h" |
| 14 | #include "linux/reboot.h" |
| 15 | #include "linux/proc_fs.h" |
| 16 | #include "linux/slab.h" |
| 17 | #include "linux/syscalls.h" |
| 18 | #include "linux/utsname.h" |
| 19 | #include "linux/workqueue.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "asm/uaccess.h" |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 21 | #include "init.h" |
| 22 | #include "irq_kern.h" |
| 23 | #include "irq_user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "kern_util.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "mconsole.h" |
| 26 | #include "mconsole_kern.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "os.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 29 | static int do_unlink_socket(struct notifier_block *notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | unsigned long what, void *data) |
| 31 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 32 | return mconsole_unlink_socket(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | |
| 36 | static struct notifier_block reboot_notifier = { |
| 37 | .notifier_call = do_unlink_socket, |
| 38 | .priority = 0, |
| 39 | }; |
| 40 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 41 | /* Safe without explicit locking for now. Tasklets provide their own |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | * locking, and the interrupt handler is safe because it can't interrupt |
| 43 | * itself and it can only happen on CPU 0. |
| 44 | */ |
| 45 | |
Jeff Dike | 9010772 | 2006-01-06 00:18:54 -0800 | [diff] [blame] | 46 | static LIST_HEAD(mc_requests); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 48 | static void mc_work_proc(struct work_struct *unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
| 50 | struct mconsole_entry *req; |
| 51 | unsigned long flags; |
| 52 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 53 | while (!list_empty(&mc_requests)) { |
Paolo 'Blaisorblade' Giarrusso | dbdb4c0 | 2006-04-10 22:53:39 -0700 | [diff] [blame] | 54 | local_irq_save(flags); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 55 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | list_del(&req->list); |
| 57 | local_irq_restore(flags); |
| 58 | req->request.cmd->handler(&req->request); |
| 59 | kfree(req); |
| 60 | } |
| 61 | } |
| 62 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 63 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 65 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
| 67 | /* long to avoid size mismatch warnings from gcc */ |
| 68 | long fd; |
| 69 | struct mconsole_entry *new; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 70 | static struct mc_request req; /* that's OK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | fd = (long) dev_id; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 73 | while (mconsole_get_request(fd, &req)) { |
| 74 | if (req.cmd->context == MCONSOLE_INTR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | (*req.cmd->handler)(&req); |
| 76 | else { |
Jeff Dike | 60baa15 | 2006-04-10 22:53:28 -0700 | [diff] [blame] | 77 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 78 | if (new == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | mconsole_reply(&req, "Out of memory", 1, 0); |
| 80 | else { |
| 81 | new->request = req; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 82 | new->request.regs = get_irq_regs()->regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | list_add(&new->list, &mc_requests); |
| 84 | } |
| 85 | } |
| 86 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 87 | if (!list_empty(&mc_requests)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | schedule_work(&mconsole_work); |
| 89 | reactivate_fd(fd, MCONSOLE_IRQ); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 90 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | void mconsole_version(struct mc_request *req) |
| 94 | { |
| 95 | char version[256]; |
| 96 | |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 97 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 98 | utsname()->nodename, utsname()->release, utsname()->version, |
| 99 | utsname()->machine); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | mconsole_reply(req, version, 0, 0); |
| 101 | } |
| 102 | |
| 103 | void mconsole_log(struct mc_request *req) |
| 104 | { |
| 105 | int len; |
| 106 | char *ptr = req->request.data; |
| 107 | |
| 108 | ptr += strlen("log "); |
| 109 | |
| 110 | len = req->len - (ptr - req->request.data); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 111 | printk(KERN_WARNING "%.*s", len, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | mconsole_reply(req, "", 0, 0); |
| 113 | } |
| 114 | |
| 115 | /* This is a more convoluted version of mconsole_proc, which has some stability |
| 116 | * problems; however, we need it fixed, because it is expected that UML users |
| 117 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still |
| 118 | * show the real procfs content, not the ones from hppfs.*/ |
| 119 | #if 0 |
| 120 | void mconsole_proc(struct mc_request *req) |
| 121 | { |
| 122 | struct nameidata nd; |
| 123 | struct file_system_type *proc; |
| 124 | struct super_block *super; |
| 125 | struct file *file; |
| 126 | int n, err; |
| 127 | char *ptr = req->request.data, *buf; |
| 128 | |
| 129 | ptr += strlen("proc"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 130 | while (isspace(*ptr)) ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | proc = get_fs_type("proc"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 133 | if (proc == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | mconsole_reply(req, "procfs not registered", 1, 0); |
| 135 | goto out; |
| 136 | } |
| 137 | |
| 138 | super = (*proc->get_sb)(proc, 0, NULL, NULL); |
| 139 | put_filesystem(proc); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 140 | if (super == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); |
| 142 | goto out; |
| 143 | } |
| 144 | up_write(&super->s_umount); |
| 145 | |
| 146 | nd.dentry = super->s_root; |
| 147 | nd.mnt = NULL; |
| 148 | nd.flags = O_RDONLY + 1; |
| 149 | nd.last_type = LAST_ROOT; |
| 150 | |
| 151 | /* START: it was experienced that the stability problems are closed |
| 152 | * if commenting out these two calls + the below read cycle. To |
| 153 | * make UML crash again, it was enough to readd either one.*/ |
| 154 | err = link_path_walk(ptr, &nd); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 155 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | mconsole_reply(req, "Failed to look up file", 1, 0); |
| 157 | goto out_kill; |
| 158 | } |
| 159 | |
| 160 | file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 161 | if (IS_ERR(file)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | mconsole_reply(req, "Failed to open file", 1, 0); |
| 163 | goto out_kill; |
| 164 | } |
| 165 | /*END*/ |
| 166 | |
| 167 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 168 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 170 | goto out_fput; |
| 171 | } |
| 172 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 173 | if ((file->f_op != NULL) && (file->f_op->read != NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | do { |
| 175 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, |
| 176 | &file->f_pos); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 177 | if (n >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | buf[n] = '\0'; |
| 179 | mconsole_reply(req, buf, 0, (n > 0)); |
| 180 | } |
| 181 | else { |
| 182 | mconsole_reply(req, "Read of file failed", |
| 183 | 1, 0); |
| 184 | goto out_free; |
| 185 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 186 | } while (n > 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | else mconsole_reply(req, "", 0, 0); |
| 189 | |
| 190 | out_free: |
| 191 | kfree(buf); |
| 192 | out_fput: |
| 193 | fput(file); |
| 194 | out_kill: |
| 195 | deactivate_super(super); |
| 196 | out: ; |
| 197 | } |
| 198 | #endif |
| 199 | |
| 200 | void mconsole_proc(struct mc_request *req) |
| 201 | { |
| 202 | char path[64]; |
| 203 | char *buf; |
| 204 | int len; |
| 205 | int fd; |
| 206 | int first_chunk = 1; |
| 207 | char *ptr = req->request.data; |
| 208 | |
| 209 | ptr += strlen("proc"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 210 | while (isspace(*ptr)) |
| 211 | ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
| 213 | |
| 214 | fd = sys_open(path, 0, 0); |
| 215 | if (fd < 0) { |
| 216 | mconsole_reply(req, "Failed to open file", 1, 0); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 217 | printk(KERN_ERR "open %s: %d\n",path,fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | goto out; |
| 219 | } |
| 220 | |
| 221 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 222 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 224 | goto out_close; |
| 225 | } |
| 226 | |
| 227 | for (;;) { |
| 228 | len = sys_read(fd, buf, PAGE_SIZE-1); |
| 229 | if (len < 0) { |
| 230 | mconsole_reply(req, "Read of file failed", 1, 0); |
| 231 | goto out_free; |
| 232 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 233 | /* Begin the file content on his own line. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | if (first_chunk) { |
| 235 | mconsole_reply(req, "\n", 0, 1); |
| 236 | first_chunk = 0; |
| 237 | } |
| 238 | if (len == PAGE_SIZE-1) { |
| 239 | buf[len] = '\0'; |
| 240 | mconsole_reply(req, buf, 0, 1); |
| 241 | } else { |
| 242 | buf[len] = '\0'; |
| 243 | mconsole_reply(req, buf, 0, 0); |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | out_free: |
| 249 | kfree(buf); |
| 250 | out_close: |
| 251 | sys_close(fd); |
| 252 | out: |
| 253 | /* nothing */; |
| 254 | } |
| 255 | |
| 256 | #define UML_MCONSOLE_HELPTEXT \ |
| 257 | "Commands: \n\ |
| 258 | version - Get kernel version \n\ |
| 259 | help - Print this message \n\ |
| 260 | halt - Halt UML \n\ |
| 261 | reboot - Reboot UML \n\ |
| 262 | config <dev>=<config> - Add a new device to UML; \n\ |
| 263 | same syntax as command line \n\ |
| 264 | config <dev> - Query the configuration of a device \n\ |
| 265 | remove <dev> - Remove a device from UML \n\ |
| 266 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ |
Jeff Dike | db80581 | 2006-02-01 03:06:23 -0800 | [diff] [blame] | 267 | cad - invoke the Ctrl-Alt-Del handler \n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
| 269 | go - continue the UML after a 'stop' \n\ |
| 270 | log <string> - make UML enter <string> into the kernel log\n\ |
| 271 | proc <file> - returns the contents of the UML's /proc/<file>\n\ |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 272 | stack <pid> - returns the stack of the specified pid\n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | " |
| 274 | |
| 275 | void mconsole_help(struct mc_request *req) |
| 276 | { |
| 277 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); |
| 278 | } |
| 279 | |
| 280 | void mconsole_halt(struct mc_request *req) |
| 281 | { |
| 282 | mconsole_reply(req, "", 0, 0); |
| 283 | machine_halt(); |
| 284 | } |
| 285 | |
| 286 | void mconsole_reboot(struct mc_request *req) |
| 287 | { |
| 288 | mconsole_reply(req, "", 0, 0); |
| 289 | machine_restart(NULL); |
| 290 | } |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | void mconsole_cad(struct mc_request *req) |
| 293 | { |
| 294 | mconsole_reply(req, "", 0, 0); |
| 295 | ctrl_alt_del(); |
| 296 | } |
| 297 | |
| 298 | void mconsole_go(struct mc_request *req) |
| 299 | { |
| 300 | mconsole_reply(req, "Not stopped", 1, 0); |
| 301 | } |
| 302 | |
| 303 | void mconsole_stop(struct mc_request *req) |
| 304 | { |
| 305 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 306 | os_set_fd_block(req->originating_fd, 1); |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 307 | mconsole_reply(req, "stopped", 0, 0); |
| 308 | while (mconsole_get_request(req->originating_fd, req)) { |
| 309 | if (req->cmd->handler == mconsole_go) |
| 310 | break; |
| 311 | if (req->cmd->handler == mconsole_stop) { |
| 312 | mconsole_reply(req, "Already stopped", 1, 0); |
| 313 | continue; |
| 314 | } |
| 315 | if (req->cmd->handler == mconsole_sysrq) { |
| 316 | struct pt_regs *old_regs; |
| 317 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); |
| 318 | mconsole_sysrq(req); |
| 319 | set_irq_regs(old_regs); |
| 320 | continue; |
| 321 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | (*req->cmd->handler)(req); |
| 323 | } |
| 324 | os_set_fd_block(req->originating_fd, 0); |
| 325 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 326 | mconsole_reply(req, "", 0, 0); |
| 327 | } |
| 328 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 329 | static DEFINE_SPINLOCK(mc_devices_lock); |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 330 | static LIST_HEAD(mconsole_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | void mconsole_register_dev(struct mc_device *new) |
| 333 | { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 334 | spin_lock(&mc_devices_lock); |
| 335 | BUG_ON(!list_empty(&new->list)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | list_add(&new->list, &mconsole_devices); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 337 | spin_unlock(&mc_devices_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static struct mc_device *mconsole_find_dev(char *name) |
| 341 | { |
| 342 | struct list_head *ele; |
| 343 | struct mc_device *dev; |
| 344 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 345 | list_for_each(ele, &mconsole_devices) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | dev = list_entry(ele, struct mc_device, list); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 347 | if (!strncmp(name, dev->name, strlen(dev->name))) |
| 348 | return dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 350 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
| 352 | |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 353 | #define UNPLUGGED_PER_PAGE \ |
| 354 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) |
| 355 | |
| 356 | struct unplugged_pages { |
| 357 | struct list_head list; |
| 358 | void *pages[UNPLUGGED_PER_PAGE]; |
| 359 | }; |
| 360 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 361 | static DECLARE_MUTEX(plug_mem_mutex); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 362 | static unsigned long long unplugged_pages_count = 0; |
Jeff Dike | c59bce6 | 2007-02-10 01:44:04 -0800 | [diff] [blame] | 363 | static LIST_HEAD(unplugged_pages); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 364 | static int unplug_index = UNPLUGGED_PER_PAGE; |
| 365 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 366 | static int mem_config(char *str, char **error_out) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 367 | { |
| 368 | unsigned long long diff; |
| 369 | int err = -EINVAL, i, add; |
| 370 | char *ret; |
| 371 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 372 | if (str[0] != '=') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 373 | *error_out = "Expected '=' after 'mem'"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 374 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 375 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 376 | |
| 377 | str++; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 378 | if (str[0] == '-') |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 379 | add = 0; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 380 | else if (str[0] == '+') { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 381 | add = 1; |
| 382 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 383 | else { |
| 384 | *error_out = "Expected increment to start with '-' or '+'"; |
| 385 | goto out; |
| 386 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 387 | |
| 388 | str++; |
| 389 | diff = memparse(str, &ret); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 390 | if (*ret != '\0') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 391 | *error_out = "Failed to parse memory increment"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 392 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 393 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 394 | |
| 395 | diff /= PAGE_SIZE; |
| 396 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 397 | down(&plug_mem_mutex); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 398 | for (i = 0; i < diff; i++) { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 399 | struct unplugged_pages *unplugged; |
| 400 | void *addr; |
| 401 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 402 | if (add) { |
| 403 | if (list_empty(&unplugged_pages)) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 404 | break; |
| 405 | |
| 406 | unplugged = list_entry(unplugged_pages.next, |
| 407 | struct unplugged_pages, list); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 408 | if (unplug_index > 0) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 409 | addr = unplugged->pages[--unplug_index]; |
| 410 | else { |
| 411 | list_del(&unplugged->list); |
| 412 | addr = unplugged; |
| 413 | unplug_index = UNPLUGGED_PER_PAGE; |
| 414 | } |
| 415 | |
| 416 | free_page((unsigned long) addr); |
| 417 | unplugged_pages_count--; |
| 418 | } |
| 419 | else { |
| 420 | struct page *page; |
| 421 | |
| 422 | page = alloc_page(GFP_ATOMIC); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 423 | if (page == NULL) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 424 | break; |
| 425 | |
| 426 | unplugged = page_address(page); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 427 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 428 | list_add(&unplugged->list, &unplugged_pages); |
| 429 | unplug_index = 0; |
| 430 | } |
| 431 | else { |
| 432 | struct list_head *entry = unplugged_pages.next; |
| 433 | addr = unplugged; |
| 434 | |
| 435 | unplugged = list_entry(entry, |
| 436 | struct unplugged_pages, |
| 437 | list); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 438 | err = os_drop_memory(addr, PAGE_SIZE); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 439 | if (err) { |
| 440 | printk(KERN_ERR "Failed to release " |
| 441 | "memory - errno = %d\n", err); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 442 | *error_out = "Failed to release memory"; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 443 | goto out_unlock; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 444 | } |
| 445 | unplugged->pages[unplug_index++] = addr; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | unplugged_pages_count++; |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | err = 0; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 453 | out_unlock: |
| 454 | up(&plug_mem_mutex); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 455 | out: |
| 456 | return err; |
| 457 | } |
| 458 | |
| 459 | static int mem_get_config(char *name, char *str, int size, char **error_out) |
| 460 | { |
| 461 | char buf[sizeof("18446744073709551615")]; |
| 462 | int len = 0; |
| 463 | |
| 464 | sprintf(buf, "%ld", uml_physmem); |
| 465 | CONFIG_CHUNK(str, size, len, buf, 1); |
| 466 | |
| 467 | return len; |
| 468 | } |
| 469 | |
| 470 | static int mem_id(char **str, int *start_out, int *end_out) |
| 471 | { |
| 472 | *start_out = 0; |
| 473 | *end_out = 0; |
| 474 | |
| 475 | return 0; |
| 476 | } |
| 477 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 478 | static int mem_remove(int n, char **error_out) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 479 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 480 | *error_out = "Memory doesn't support the remove operation"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 481 | return -EBUSY; |
| 482 | } |
| 483 | |
| 484 | static struct mc_device mem_mc = { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 485 | .list = LIST_HEAD_INIT(mem_mc.list), |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 486 | .name = "mem", |
| 487 | .config = mem_config, |
| 488 | .get_config = mem_get_config, |
| 489 | .id = mem_id, |
| 490 | .remove = mem_remove, |
| 491 | }; |
| 492 | |
Jeff Dike | 97a1fcb | 2007-07-23 18:43:48 -0700 | [diff] [blame] | 493 | static int __init mem_mc_init(void) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 494 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 495 | if (can_drop_memory()) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 496 | mconsole_register_dev(&mem_mc); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 497 | else printk(KERN_ERR "Can't release memory to the host - memory " |
| 498 | "hotplug won't be supported\n"); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | __initcall(mem_mc_init); |
| 503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | #define CONFIG_BUF_SIZE 64 |
| 505 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 506 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | char **), |
| 508 | struct mc_request *req, char *name) |
| 509 | { |
| 510 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; |
| 511 | int n, size; |
| 512 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 513 | if (get_config == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
| 515 | return; |
| 516 | } |
| 517 | |
| 518 | error = NULL; |
Jeff Dike | 91b165c | 2006-09-25 23:33:00 -0700 | [diff] [blame] | 519 | size = ARRAY_SIZE(default_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | buf = default_buf; |
| 521 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 522 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | n = (*get_config)(name, buf, size, &error); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 524 | if (error != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | mconsole_reply(req, error, 1, 0); |
| 526 | goto out; |
| 527 | } |
| 528 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 529 | if (n <= size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | mconsole_reply(req, buf, 0, 0); |
| 531 | goto out; |
| 532 | } |
| 533 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 534 | if (buf != default_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | kfree(buf); |
| 536 | |
| 537 | size = n; |
| 538 | buf = kmalloc(size, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 539 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 541 | return; |
| 542 | } |
| 543 | } |
| 544 | out: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 545 | if (buf != default_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | void mconsole_config(struct mc_request *req) |
| 550 | { |
| 551 | struct mc_device *dev; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 552 | char *ptr = req->request.data, *name, *error_string = ""; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | int err; |
| 554 | |
| 555 | ptr += strlen("config"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 556 | while (isspace(*ptr)) |
| 557 | ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | dev = mconsole_find_dev(ptr); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 559 | if (dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | mconsole_reply(req, "Bad configuration option", 1, 0); |
| 561 | return; |
| 562 | } |
| 563 | |
| 564 | name = &ptr[strlen(dev->name)]; |
| 565 | ptr = name; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 566 | while ((*ptr != '=') && (*ptr != '\0')) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | ptr++; |
| 568 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 569 | if (*ptr == '=') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 570 | err = (*dev->config)(name, &error_string); |
| 571 | mconsole_reply(req, error_string, err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
| 573 | else mconsole_get_config(dev->get_config, req, name); |
| 574 | } |
| 575 | |
| 576 | void mconsole_remove(struct mc_request *req) |
| 577 | { |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 578 | struct mc_device *dev; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 579 | char *ptr = req->request.data, *err_msg = ""; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 580 | char error[256]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 581 | int err, start, end, n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | ptr += strlen("remove"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 584 | while (isspace(*ptr)) ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | dev = mconsole_find_dev(ptr); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 586 | if (dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | mconsole_reply(req, "Bad remove option", 1, 0); |
| 588 | return; |
| 589 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 590 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 591 | ptr = &ptr[strlen(dev->name)]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 592 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 593 | err = 1; |
| 594 | n = (*dev->id)(&ptr, &start, &end); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 595 | if (n < 0) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 596 | err_msg = "Couldn't parse device number"; |
| 597 | goto out; |
| 598 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 599 | else if ((n < start) || (n > end)) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 600 | sprintf(error, "Invalid device number - must be between " |
| 601 | "%d and %d", start, end); |
| 602 | err_msg = error; |
| 603 | goto out; |
| 604 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 605 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 606 | err_msg = NULL; |
| 607 | err = (*dev->remove)(n, &err_msg); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 608 | switch(err) { |
Jeff Dike | d40f6d7 | 2007-03-29 01:20:28 -0700 | [diff] [blame] | 609 | case 0: |
| 610 | err_msg = ""; |
| 611 | break; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 612 | case -ENODEV: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 613 | if (err_msg == NULL) |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 614 | err_msg = "Device doesn't exist"; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 615 | break; |
| 616 | case -EBUSY: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 617 | if (err_msg == NULL) |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 618 | err_msg = "Device is currently open"; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 619 | break; |
| 620 | default: |
| 621 | break; |
| 622 | } |
| 623 | out: |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 624 | mconsole_reply(req, err_msg, err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 627 | struct mconsole_output { |
| 628 | struct list_head list; |
| 629 | struct mc_request *req; |
| 630 | }; |
| 631 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 632 | static DEFINE_SPINLOCK(client_lock); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 633 | static LIST_HEAD(clients); |
| 634 | static char console_buf[MCONSOLE_MAX_DATA]; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 635 | |
| 636 | static void console_write(struct console *console, const char *string, |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 637 | unsigned int len) |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 638 | { |
| 639 | struct list_head *ele; |
| 640 | int n; |
| 641 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 642 | if (list_empty(&clients)) |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 643 | return; |
| 644 | |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 645 | while (len > 0) { |
| 646 | n = min((size_t) len, ARRAY_SIZE(console_buf)); |
| 647 | strncpy(console_buf, string, n); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 648 | string += n; |
| 649 | len -= n; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 650 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 651 | list_for_each(ele, &clients) { |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 652 | struct mconsole_output *entry; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 653 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 654 | entry = list_entry(ele, struct mconsole_output, list); |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 655 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 656 | } |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 657 | } |
| 658 | } |
| 659 | |
| 660 | static struct console mc_console = { .name = "mc", |
| 661 | .write = console_write, |
Jeff Dike | a174b30 | 2006-01-11 12:17:28 -0800 | [diff] [blame] | 662 | .flags = CON_ENABLED, |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 663 | .index = -1 }; |
| 664 | |
| 665 | static int mc_add_console(void) |
| 666 | { |
| 667 | register_console(&mc_console); |
| 668 | return 0; |
| 669 | } |
| 670 | |
| 671 | late_initcall(mc_add_console); |
| 672 | |
| 673 | static void with_console(struct mc_request *req, void (*proc)(void *), |
| 674 | void *arg) |
| 675 | { |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 676 | struct mconsole_output entry; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 677 | unsigned long flags; |
| 678 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 679 | entry.req = req; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 680 | spin_lock_irqsave(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 681 | list_add(&entry.list, &clients); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 682 | spin_unlock_irqrestore(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 683 | |
| 684 | (*proc)(arg); |
| 685 | |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 686 | mconsole_reply_len(req, "", 0, 0, 0); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 687 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 688 | spin_lock_irqsave(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 689 | list_del(&entry.list); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 690 | spin_unlock_irqrestore(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 691 | } |
| 692 | |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 693 | #ifdef CONFIG_MAGIC_SYSRQ |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 694 | |
| 695 | #include <linux/sysrq.h> |
| 696 | |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 697 | static void sysrq_proc(void *arg) |
| 698 | { |
| 699 | char *op = arg; |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 700 | handle_sysrq(*op, NULL); |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | void mconsole_sysrq(struct mc_request *req) |
| 704 | { |
| 705 | char *ptr = req->request.data; |
| 706 | |
| 707 | ptr += strlen("sysrq"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 708 | while (isspace(*ptr)) ptr++; |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 709 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 710 | /* |
| 711 | * With 'b', the system will shut down without a chance to reply, |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 712 | * so in this case, we reply first. |
| 713 | */ |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 714 | if (*ptr == 'b') |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 715 | mconsole_reply(req, "", 0, 0); |
| 716 | |
| 717 | with_console(req, sysrq_proc, ptr); |
| 718 | } |
| 719 | #else |
| 720 | void mconsole_sysrq(struct mc_request *req) |
| 721 | { |
| 722 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); |
| 723 | } |
| 724 | #endif |
| 725 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 726 | static void stack_proc(void *arg) |
| 727 | { |
| 728 | struct task_struct *from = current, *to = arg; |
| 729 | |
| 730 | to->thread.saved_task = from; |
| 731 | switch_to(from, to, from); |
| 732 | } |
| 733 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 734 | /* |
| 735 | * Mconsole stack trace |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 736 | * Added by Allan Graves, Jeff Dike |
| 737 | * Dumps a stacks registers to the linux console. |
| 738 | * Usage stack <pid>. |
| 739 | */ |
Jeff Dike | 42fda66 | 2007-10-16 01:26:50 -0700 | [diff] [blame] | 740 | void mconsole_stack(struct mc_request *req) |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 741 | { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 742 | char *ptr = req->request.data; |
| 743 | int pid_requested= -1; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 744 | struct task_struct *from = NULL; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 745 | struct task_struct *to = NULL; |
| 746 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 747 | /* |
| 748 | * Would be nice: |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 749 | * 1) Send showregs output to mconsole. |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 750 | * 2) Add a way to stack dump all pids. |
| 751 | */ |
| 752 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 753 | ptr += strlen("stack"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 754 | while (isspace(*ptr)) |
| 755 | ptr++; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 756 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 757 | /* |
| 758 | * Should really check for multiple pids or reject bad args here |
| 759 | */ |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 760 | /* What do the arguments in mconsole_reply mean? */ |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 761 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 762 | mconsole_reply(req, "Please specify a pid", 1, 0); |
| 763 | return; |
| 764 | } |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 765 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 766 | from = current; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 767 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 768 | to = find_task_by_pid(pid_requested); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 769 | if ((to == NULL) || (pid_requested == 0)) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 770 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
| 771 | return; |
| 772 | } |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 773 | with_console(req, stack_proc, to); |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 774 | } |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 775 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 776 | /* |
| 777 | * Changed by mconsole_setup, which is __setup, and called before SMP is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | * active. |
| 779 | */ |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 780 | static char *notify_socket = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
Jeff Dike | 97a1fcb | 2007-07-23 18:43:48 -0700 | [diff] [blame] | 782 | static int __init mconsole_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
| 784 | /* long to avoid size mismatch warnings from gcc */ |
| 785 | long sock; |
| 786 | int err; |
| 787 | char file[256]; |
| 788 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 789 | if (umid_file_name("mconsole", file, sizeof(file))) |
| 790 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
| 792 | |
| 793 | sock = os_create_unix_socket(file, sizeof(file), 1); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 794 | if (sock < 0) { |
| 795 | printk(KERN_ERR "Failed to initialize management console\n"); |
| 796 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | register_reboot_notifier(&reboot_notifier); |
| 800 | |
| 801 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, |
Thomas Gleixner | bd6aa65 | 2006-07-01 19:29:27 -0700 | [diff] [blame] | 802 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | "mconsole", (void *)sock); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 804 | if (err) { |
| 805 | printk(KERN_ERR "Failed to get IRQ for management console\n"); |
| 806 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
| 808 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 809 | if (notify_socket != NULL) { |
Jeff Dike | 970d6e3 | 2006-01-06 00:18:48 -0800 | [diff] [blame] | 810 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 811 | if (notify_socket != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 813 | mconsole_socket_name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | strlen(mconsole_socket_name) + 1); |
| 815 | else printk(KERN_ERR "mconsole_setup failed to strdup " |
| 816 | "string\n"); |
| 817 | } |
| 818 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 819 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | MCONSOLE_VERSION, mconsole_socket_name); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 821 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | |
| 824 | __initcall(mconsole_init); |
| 825 | |
| 826 | static int write_proc_mconsole(struct file *file, const char __user *buffer, |
| 827 | unsigned long count, void *data) |
| 828 | { |
| 829 | char *buf; |
| 830 | |
| 831 | buf = kmalloc(count + 1, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 832 | if (buf == NULL) |
| 833 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 835 | if (copy_from_user(buf, buffer, count)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | count = -EFAULT; |
| 837 | goto out; |
| 838 | } |
| 839 | |
| 840 | buf[count] = '\0'; |
| 841 | |
| 842 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); |
| 843 | out: |
| 844 | kfree(buf); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 845 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | static int create_proc_mconsole(void) |
| 849 | { |
| 850 | struct proc_dir_entry *ent; |
| 851 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 852 | if (notify_socket == NULL) |
| 853 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
| 855 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 856 | if (ent == NULL) { |
| 857 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " |
| 858 | "failed\n"); |
| 859 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | } |
| 861 | |
| 862 | ent->read_proc = NULL; |
| 863 | ent->write_proc = write_proc_mconsole; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 864 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } |
| 866 | |
| 867 | static DEFINE_SPINLOCK(notify_spinlock); |
| 868 | |
| 869 | void lock_notify(void) |
| 870 | { |
| 871 | spin_lock(¬ify_spinlock); |
| 872 | } |
| 873 | |
| 874 | void unlock_notify(void) |
| 875 | { |
| 876 | spin_unlock(¬ify_spinlock); |
| 877 | } |
| 878 | |
| 879 | __initcall(create_proc_mconsole); |
| 880 | |
Jeff Dike | 088bec4 | 2007-10-16 01:27:20 -0700 | [diff] [blame] | 881 | #define NOTIFY "notify:" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
| 883 | static int mconsole_setup(char *str) |
| 884 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 885 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | str += strlen(NOTIFY); |
| 887 | notify_socket = str; |
| 888 | } |
| 889 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 890 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
| 892 | |
Jeff Dike | 088bec4 | 2007-10-16 01:27:20 -0700 | [diff] [blame] | 893 | __setup("mconsole=", mconsole_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
| 895 | __uml_help(mconsole_setup, |
| 896 | "mconsole=notify:<socket>\n" |
| 897 | " Requests that the mconsole driver send a message to the named Unix\n" |
| 898 | " socket containing the name of the mconsole socket. This also serves\n" |
| 899 | " to notify outside processes when UML has booted far enough to respond\n" |
| 900 | " to mconsole requests.\n\n" |
| 901 | ); |
| 902 | |
| 903 | static int notify_panic(struct notifier_block *self, unsigned long unused1, |
| 904 | void *ptr) |
| 905 | { |
| 906 | char *message = ptr; |
| 907 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 908 | if (notify_socket == NULL) |
| 909 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 911 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | strlen(message) + 1); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 913 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | |
| 916 | static struct notifier_block panic_exit_notifier = { |
| 917 | .notifier_call = notify_panic, |
| 918 | .next = NULL, |
| 919 | .priority = 1 |
| 920 | }; |
| 921 | |
| 922 | static int add_notifier(void) |
| 923 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 924 | atomic_notifier_chain_register(&panic_notifier_list, |
| 925 | &panic_exit_notifier); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 926 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | |
| 929 | __initcall(add_notifier); |
| 930 | |
| 931 | char *mconsole_notify_socket(void) |
| 932 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 933 | return notify_socket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | } |
| 935 | |
| 936 | EXPORT_SYMBOL(mconsole_notify_socket); |