Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) |
Jeff Dike | 827b3f6 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 3 | * Copyright (C) 2001 - 2008 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 | 827b3f6 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 7 | #include <linux/console.h> |
| 8 | #include <linux/ctype.h> |
| 9 | #include <linux/interrupt.h> |
| 10 | #include <linux/list.h> |
| 11 | #include <linux/mm.h> |
| 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> |
| 20 | #include <linux/mutex.h> |
| 21 | #include <asm/uaccess.h> |
| 22 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 23 | #include "init.h" |
| 24 | #include "irq_kern.h" |
| 25 | #include "irq_user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "kern_util.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "mconsole.h" |
| 28 | #include "mconsole_kern.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "os.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 31 | static int do_unlink_socket(struct notifier_block *notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | unsigned long what, void *data) |
| 33 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 34 | return mconsole_unlink_socket(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | } |
| 36 | |
| 37 | |
| 38 | static struct notifier_block reboot_notifier = { |
| 39 | .notifier_call = do_unlink_socket, |
| 40 | .priority = 0, |
| 41 | }; |
| 42 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 43 | /* Safe without explicit locking for now. Tasklets provide their own |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | * locking, and the interrupt handler is safe because it can't interrupt |
| 45 | * itself and it can only happen on CPU 0. |
| 46 | */ |
| 47 | |
Jeff Dike | 9010772 | 2006-01-06 00:18:54 -0800 | [diff] [blame] | 48 | static LIST_HEAD(mc_requests); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 50 | static void mc_work_proc(struct work_struct *unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
| 52 | struct mconsole_entry *req; |
| 53 | unsigned long flags; |
| 54 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 55 | while (!list_empty(&mc_requests)) { |
Paolo 'Blaisorblade' Giarrusso | dbdb4c0 | 2006-04-10 22:53:39 -0700 | [diff] [blame] | 56 | local_irq_save(flags); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 57 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | list_del(&req->list); |
| 59 | local_irq_restore(flags); |
| 60 | req->request.cmd->handler(&req->request); |
| 61 | kfree(req); |
| 62 | } |
| 63 | } |
| 64 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 65 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 67 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
| 69 | /* long to avoid size mismatch warnings from gcc */ |
| 70 | long fd; |
| 71 | struct mconsole_entry *new; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 72 | static struct mc_request req; /* that's OK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | fd = (long) dev_id; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 75 | while (mconsole_get_request(fd, &req)) { |
| 76 | if (req.cmd->context == MCONSOLE_INTR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | (*req.cmd->handler)(&req); |
| 78 | else { |
Jeff Dike | 60baa15 | 2006-04-10 22:53:28 -0700 | [diff] [blame] | 79 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 80 | if (new == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | mconsole_reply(&req, "Out of memory", 1, 0); |
| 82 | else { |
| 83 | new->request = req; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 84 | new->request.regs = get_irq_regs()->regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | list_add(&new->list, &mc_requests); |
| 86 | } |
| 87 | } |
| 88 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 89 | if (!list_empty(&mc_requests)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | schedule_work(&mconsole_work); |
| 91 | reactivate_fd(fd, MCONSOLE_IRQ); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 92 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | void mconsole_version(struct mc_request *req) |
| 96 | { |
| 97 | char version[256]; |
| 98 | |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 99 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 100 | utsname()->nodename, utsname()->release, utsname()->version, |
| 101 | utsname()->machine); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | mconsole_reply(req, version, 0, 0); |
| 103 | } |
| 104 | |
| 105 | void mconsole_log(struct mc_request *req) |
| 106 | { |
| 107 | int len; |
| 108 | char *ptr = req->request.data; |
| 109 | |
| 110 | ptr += strlen("log "); |
| 111 | |
| 112 | len = req->len - (ptr - req->request.data); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 113 | printk(KERN_WARNING "%.*s", len, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | mconsole_reply(req, "", 0, 0); |
| 115 | } |
| 116 | |
| 117 | /* This is a more convoluted version of mconsole_proc, which has some stability |
| 118 | * problems; however, we need it fixed, because it is expected that UML users |
| 119 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still |
| 120 | * show the real procfs content, not the ones from hppfs.*/ |
| 121 | #if 0 |
| 122 | void mconsole_proc(struct mc_request *req) |
| 123 | { |
| 124 | struct nameidata nd; |
| 125 | struct file_system_type *proc; |
| 126 | struct super_block *super; |
| 127 | struct file *file; |
| 128 | int n, err; |
| 129 | char *ptr = req->request.data, *buf; |
| 130 | |
| 131 | ptr += strlen("proc"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 132 | while (isspace(*ptr)) ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | proc = get_fs_type("proc"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 135 | if (proc == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | mconsole_reply(req, "procfs not registered", 1, 0); |
| 137 | goto out; |
| 138 | } |
| 139 | |
| 140 | super = (*proc->get_sb)(proc, 0, NULL, NULL); |
| 141 | put_filesystem(proc); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 142 | if (super == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); |
| 144 | goto out; |
| 145 | } |
| 146 | up_write(&super->s_umount); |
| 147 | |
| 148 | nd.dentry = super->s_root; |
| 149 | nd.mnt = NULL; |
| 150 | nd.flags = O_RDONLY + 1; |
| 151 | nd.last_type = LAST_ROOT; |
| 152 | |
| 153 | /* START: it was experienced that the stability problems are closed |
| 154 | * if commenting out these two calls + the below read cycle. To |
| 155 | * make UML crash again, it was enough to readd either one.*/ |
| 156 | err = link_path_walk(ptr, &nd); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 157 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | mconsole_reply(req, "Failed to look up file", 1, 0); |
| 159 | goto out_kill; |
| 160 | } |
| 161 | |
| 162 | file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 163 | if (IS_ERR(file)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | mconsole_reply(req, "Failed to open file", 1, 0); |
| 165 | goto out_kill; |
| 166 | } |
| 167 | /*END*/ |
| 168 | |
| 169 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 170 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 172 | goto out_fput; |
| 173 | } |
| 174 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 175 | if ((file->f_op != NULL) && (file->f_op->read != NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | do { |
| 177 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, |
| 178 | &file->f_pos); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 179 | if (n >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | buf[n] = '\0'; |
| 181 | mconsole_reply(req, buf, 0, (n > 0)); |
| 182 | } |
| 183 | else { |
| 184 | mconsole_reply(req, "Read of file failed", |
| 185 | 1, 0); |
| 186 | goto out_free; |
| 187 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 188 | } while (n > 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | else mconsole_reply(req, "", 0, 0); |
| 191 | |
| 192 | out_free: |
| 193 | kfree(buf); |
| 194 | out_fput: |
| 195 | fput(file); |
| 196 | out_kill: |
| 197 | deactivate_super(super); |
| 198 | out: ; |
| 199 | } |
| 200 | #endif |
| 201 | |
| 202 | void mconsole_proc(struct mc_request *req) |
| 203 | { |
| 204 | char path[64]; |
| 205 | char *buf; |
| 206 | int len; |
| 207 | int fd; |
| 208 | int first_chunk = 1; |
| 209 | char *ptr = req->request.data; |
| 210 | |
| 211 | ptr += strlen("proc"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 212 | while (isspace(*ptr)) |
| 213 | ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
| 215 | |
| 216 | fd = sys_open(path, 0, 0); |
| 217 | if (fd < 0) { |
| 218 | mconsole_reply(req, "Failed to open file", 1, 0); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 219 | printk(KERN_ERR "open %s: %d\n",path,fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | goto out; |
| 221 | } |
| 222 | |
| 223 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 224 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 226 | goto out_close; |
| 227 | } |
| 228 | |
| 229 | for (;;) { |
| 230 | len = sys_read(fd, buf, PAGE_SIZE-1); |
| 231 | if (len < 0) { |
| 232 | mconsole_reply(req, "Read of file failed", 1, 0); |
| 233 | goto out_free; |
| 234 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 235 | /* Begin the file content on his own line. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | if (first_chunk) { |
| 237 | mconsole_reply(req, "\n", 0, 1); |
| 238 | first_chunk = 0; |
| 239 | } |
| 240 | if (len == PAGE_SIZE-1) { |
| 241 | buf[len] = '\0'; |
| 242 | mconsole_reply(req, buf, 0, 1); |
| 243 | } else { |
| 244 | buf[len] = '\0'; |
| 245 | mconsole_reply(req, buf, 0, 0); |
| 246 | break; |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | out_free: |
| 251 | kfree(buf); |
| 252 | out_close: |
| 253 | sys_close(fd); |
| 254 | out: |
| 255 | /* nothing */; |
| 256 | } |
| 257 | |
| 258 | #define UML_MCONSOLE_HELPTEXT \ |
| 259 | "Commands: \n\ |
| 260 | version - Get kernel version \n\ |
| 261 | help - Print this message \n\ |
| 262 | halt - Halt UML \n\ |
| 263 | reboot - Reboot UML \n\ |
| 264 | config <dev>=<config> - Add a new device to UML; \n\ |
| 265 | same syntax as command line \n\ |
| 266 | config <dev> - Query the configuration of a device \n\ |
| 267 | remove <dev> - Remove a device from UML \n\ |
| 268 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ |
Jeff Dike | db80581 | 2006-02-01 03:06:23 -0800 | [diff] [blame] | 269 | cad - invoke the Ctrl-Alt-Del handler \n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
| 271 | go - continue the UML after a 'stop' \n\ |
| 272 | log <string> - make UML enter <string> into the kernel log\n\ |
| 273 | proc <file> - returns the contents of the UML's /proc/<file>\n\ |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 274 | stack <pid> - returns the stack of the specified pid\n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | " |
| 276 | |
| 277 | void mconsole_help(struct mc_request *req) |
| 278 | { |
| 279 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); |
| 280 | } |
| 281 | |
| 282 | void mconsole_halt(struct mc_request *req) |
| 283 | { |
| 284 | mconsole_reply(req, "", 0, 0); |
| 285 | machine_halt(); |
| 286 | } |
| 287 | |
| 288 | void mconsole_reboot(struct mc_request *req) |
| 289 | { |
| 290 | mconsole_reply(req, "", 0, 0); |
| 291 | machine_restart(NULL); |
| 292 | } |
| 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | void mconsole_cad(struct mc_request *req) |
| 295 | { |
| 296 | mconsole_reply(req, "", 0, 0); |
| 297 | ctrl_alt_del(); |
| 298 | } |
| 299 | |
| 300 | void mconsole_go(struct mc_request *req) |
| 301 | { |
| 302 | mconsole_reply(req, "Not stopped", 1, 0); |
| 303 | } |
| 304 | |
| 305 | void mconsole_stop(struct mc_request *req) |
| 306 | { |
| 307 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 308 | os_set_fd_block(req->originating_fd, 1); |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 309 | mconsole_reply(req, "stopped", 0, 0); |
Karol Swietlicki | cc0be0f | 2008-02-04 22:31:25 -0800 | [diff] [blame] | 310 | for (;;) { |
| 311 | if (!mconsole_get_request(req->originating_fd, req)) |
| 312 | continue; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 313 | if (req->cmd->handler == mconsole_go) |
| 314 | break; |
| 315 | if (req->cmd->handler == mconsole_stop) { |
| 316 | mconsole_reply(req, "Already stopped", 1, 0); |
| 317 | continue; |
| 318 | } |
| 319 | if (req->cmd->handler == mconsole_sysrq) { |
| 320 | struct pt_regs *old_regs; |
| 321 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); |
| 322 | mconsole_sysrq(req); |
| 323 | set_irq_regs(old_regs); |
| 324 | continue; |
| 325 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | (*req->cmd->handler)(req); |
| 327 | } |
| 328 | os_set_fd_block(req->originating_fd, 0); |
| 329 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 330 | mconsole_reply(req, "", 0, 0); |
| 331 | } |
| 332 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 333 | static DEFINE_SPINLOCK(mc_devices_lock); |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 334 | static LIST_HEAD(mconsole_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
| 336 | void mconsole_register_dev(struct mc_device *new) |
| 337 | { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 338 | spin_lock(&mc_devices_lock); |
| 339 | BUG_ON(!list_empty(&new->list)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | list_add(&new->list, &mconsole_devices); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 341 | spin_unlock(&mc_devices_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | static struct mc_device *mconsole_find_dev(char *name) |
| 345 | { |
| 346 | struct list_head *ele; |
| 347 | struct mc_device *dev; |
| 348 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 349 | list_for_each(ele, &mconsole_devices) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | dev = list_entry(ele, struct mc_device, list); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 351 | if (!strncmp(name, dev->name, strlen(dev->name))) |
| 352 | return dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 354 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 357 | #define UNPLUGGED_PER_PAGE \ |
| 358 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) |
| 359 | |
| 360 | struct unplugged_pages { |
| 361 | struct list_head list; |
| 362 | void *pages[UNPLUGGED_PER_PAGE]; |
| 363 | }; |
| 364 | |
Daniel Walker | e98fa28 | 2008-02-04 22:31:27 -0800 | [diff] [blame] | 365 | static DEFINE_MUTEX(plug_mem_mutex); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 366 | static unsigned long long unplugged_pages_count = 0; |
Jeff Dike | c59bce6 | 2007-02-10 01:44:04 -0800 | [diff] [blame] | 367 | static LIST_HEAD(unplugged_pages); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 368 | static int unplug_index = UNPLUGGED_PER_PAGE; |
| 369 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 370 | static int mem_config(char *str, char **error_out) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 371 | { |
| 372 | unsigned long long diff; |
| 373 | int err = -EINVAL, i, add; |
| 374 | char *ret; |
| 375 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 376 | if (str[0] != '=') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 377 | *error_out = "Expected '=' after 'mem'"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 378 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 379 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 380 | |
| 381 | str++; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 382 | if (str[0] == '-') |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 383 | add = 0; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 384 | else if (str[0] == '+') { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 385 | add = 1; |
| 386 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 387 | else { |
| 388 | *error_out = "Expected increment to start with '-' or '+'"; |
| 389 | goto out; |
| 390 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 391 | |
| 392 | str++; |
| 393 | diff = memparse(str, &ret); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 394 | if (*ret != '\0') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 395 | *error_out = "Failed to parse memory increment"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 396 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 397 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 398 | |
| 399 | diff /= PAGE_SIZE; |
| 400 | |
Daniel Walker | e98fa28 | 2008-02-04 22:31:27 -0800 | [diff] [blame] | 401 | mutex_lock(&plug_mem_mutex); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 402 | for (i = 0; i < diff; i++) { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 403 | struct unplugged_pages *unplugged; |
| 404 | void *addr; |
| 405 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 406 | if (add) { |
| 407 | if (list_empty(&unplugged_pages)) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 408 | break; |
| 409 | |
| 410 | unplugged = list_entry(unplugged_pages.next, |
| 411 | struct unplugged_pages, list); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 412 | if (unplug_index > 0) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 413 | addr = unplugged->pages[--unplug_index]; |
| 414 | else { |
| 415 | list_del(&unplugged->list); |
| 416 | addr = unplugged; |
| 417 | unplug_index = UNPLUGGED_PER_PAGE; |
| 418 | } |
| 419 | |
| 420 | free_page((unsigned long) addr); |
| 421 | unplugged_pages_count--; |
| 422 | } |
| 423 | else { |
| 424 | struct page *page; |
| 425 | |
| 426 | page = alloc_page(GFP_ATOMIC); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 427 | if (page == NULL) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 428 | break; |
| 429 | |
| 430 | unplugged = page_address(page); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 431 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 432 | list_add(&unplugged->list, &unplugged_pages); |
| 433 | unplug_index = 0; |
| 434 | } |
| 435 | else { |
| 436 | struct list_head *entry = unplugged_pages.next; |
| 437 | addr = unplugged; |
| 438 | |
| 439 | unplugged = list_entry(entry, |
| 440 | struct unplugged_pages, |
| 441 | list); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 442 | err = os_drop_memory(addr, PAGE_SIZE); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 443 | if (err) { |
| 444 | printk(KERN_ERR "Failed to release " |
| 445 | "memory - errno = %d\n", err); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 446 | *error_out = "Failed to release memory"; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 447 | goto out_unlock; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 448 | } |
| 449 | unplugged->pages[unplug_index++] = addr; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | unplugged_pages_count++; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | err = 0; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 457 | out_unlock: |
Daniel Walker | e98fa28 | 2008-02-04 22:31:27 -0800 | [diff] [blame] | 458 | mutex_unlock(&plug_mem_mutex); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 459 | out: |
| 460 | return err; |
| 461 | } |
| 462 | |
| 463 | static int mem_get_config(char *name, char *str, int size, char **error_out) |
| 464 | { |
| 465 | char buf[sizeof("18446744073709551615")]; |
| 466 | int len = 0; |
| 467 | |
| 468 | sprintf(buf, "%ld", uml_physmem); |
| 469 | CONFIG_CHUNK(str, size, len, buf, 1); |
| 470 | |
| 471 | return len; |
| 472 | } |
| 473 | |
| 474 | static int mem_id(char **str, int *start_out, int *end_out) |
| 475 | { |
| 476 | *start_out = 0; |
| 477 | *end_out = 0; |
| 478 | |
| 479 | return 0; |
| 480 | } |
| 481 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 482 | static int mem_remove(int n, char **error_out) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 483 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 484 | *error_out = "Memory doesn't support the remove operation"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 485 | return -EBUSY; |
| 486 | } |
| 487 | |
| 488 | static struct mc_device mem_mc = { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 489 | .list = LIST_HEAD_INIT(mem_mc.list), |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 490 | .name = "mem", |
| 491 | .config = mem_config, |
| 492 | .get_config = mem_get_config, |
| 493 | .id = mem_id, |
| 494 | .remove = mem_remove, |
| 495 | }; |
| 496 | |
Jeff Dike | 97a1fcb | 2007-07-23 18:43:48 -0700 | [diff] [blame] | 497 | static int __init mem_mc_init(void) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 498 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 499 | if (can_drop_memory()) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 500 | mconsole_register_dev(&mem_mc); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 501 | else printk(KERN_ERR "Can't release memory to the host - memory " |
| 502 | "hotplug won't be supported\n"); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | __initcall(mem_mc_init); |
| 507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | #define CONFIG_BUF_SIZE 64 |
| 509 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 510 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | char **), |
| 512 | struct mc_request *req, char *name) |
| 513 | { |
| 514 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; |
| 515 | int n, size; |
| 516 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 517 | if (get_config == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
| 519 | return; |
| 520 | } |
| 521 | |
| 522 | error = NULL; |
Jeff Dike | 91b165c | 2006-09-25 23:33:00 -0700 | [diff] [blame] | 523 | size = ARRAY_SIZE(default_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | buf = default_buf; |
| 525 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 526 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | n = (*get_config)(name, buf, size, &error); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 528 | if (error != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | mconsole_reply(req, error, 1, 0); |
| 530 | goto out; |
| 531 | } |
| 532 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 533 | if (n <= size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | mconsole_reply(req, buf, 0, 0); |
| 535 | goto out; |
| 536 | } |
| 537 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 538 | if (buf != default_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | kfree(buf); |
| 540 | |
| 541 | size = n; |
| 542 | buf = kmalloc(size, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 543 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 545 | return; |
| 546 | } |
| 547 | } |
| 548 | out: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 549 | if (buf != default_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | void mconsole_config(struct mc_request *req) |
| 554 | { |
| 555 | struct mc_device *dev; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 556 | char *ptr = req->request.data, *name, *error_string = ""; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | int err; |
| 558 | |
| 559 | ptr += strlen("config"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 560 | while (isspace(*ptr)) |
| 561 | ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | dev = mconsole_find_dev(ptr); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 563 | if (dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | mconsole_reply(req, "Bad configuration option", 1, 0); |
| 565 | return; |
| 566 | } |
| 567 | |
| 568 | name = &ptr[strlen(dev->name)]; |
| 569 | ptr = name; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 570 | while ((*ptr != '=') && (*ptr != '\0')) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | ptr++; |
| 572 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 573 | if (*ptr == '=') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 574 | err = (*dev->config)(name, &error_string); |
| 575 | mconsole_reply(req, error_string, err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | else mconsole_get_config(dev->get_config, req, name); |
| 578 | } |
| 579 | |
| 580 | void mconsole_remove(struct mc_request *req) |
| 581 | { |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 582 | struct mc_device *dev; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 583 | char *ptr = req->request.data, *err_msg = ""; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 584 | char error[256]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 585 | int err, start, end, n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
| 587 | ptr += strlen("remove"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 588 | while (isspace(*ptr)) ptr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | dev = mconsole_find_dev(ptr); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 590 | if (dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | mconsole_reply(req, "Bad remove option", 1, 0); |
| 592 | return; |
| 593 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 594 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 595 | ptr = &ptr[strlen(dev->name)]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 596 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 597 | err = 1; |
| 598 | n = (*dev->id)(&ptr, &start, &end); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 599 | if (n < 0) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 600 | err_msg = "Couldn't parse device number"; |
| 601 | goto out; |
| 602 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 603 | else if ((n < start) || (n > end)) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 604 | sprintf(error, "Invalid device number - must be between " |
| 605 | "%d and %d", start, end); |
| 606 | err_msg = error; |
| 607 | goto out; |
| 608 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 609 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 610 | err_msg = NULL; |
| 611 | err = (*dev->remove)(n, &err_msg); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 612 | switch(err) { |
Jeff Dike | d40f6d7 | 2007-03-29 01:20:28 -0700 | [diff] [blame] | 613 | case 0: |
| 614 | err_msg = ""; |
| 615 | break; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 616 | case -ENODEV: |
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 doesn't exist"; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 619 | break; |
| 620 | case -EBUSY: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 621 | if (err_msg == NULL) |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 622 | err_msg = "Device is currently open"; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 623 | break; |
| 624 | default: |
| 625 | break; |
| 626 | } |
| 627 | out: |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 628 | mconsole_reply(req, err_msg, err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
| 630 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 631 | struct mconsole_output { |
| 632 | struct list_head list; |
| 633 | struct mc_request *req; |
| 634 | }; |
| 635 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 636 | static DEFINE_SPINLOCK(client_lock); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 637 | static LIST_HEAD(clients); |
| 638 | static char console_buf[MCONSOLE_MAX_DATA]; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 639 | |
| 640 | static void console_write(struct console *console, const char *string, |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 641 | unsigned int len) |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 642 | { |
| 643 | struct list_head *ele; |
| 644 | int n; |
| 645 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 646 | if (list_empty(&clients)) |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 647 | return; |
| 648 | |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 649 | while (len > 0) { |
| 650 | n = min((size_t) len, ARRAY_SIZE(console_buf)); |
| 651 | strncpy(console_buf, string, n); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 652 | string += n; |
| 653 | len -= n; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 654 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 655 | list_for_each(ele, &clients) { |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 656 | struct mconsole_output *entry; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 657 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 658 | entry = list_entry(ele, struct mconsole_output, list); |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 659 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 660 | } |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 661 | } |
| 662 | } |
| 663 | |
| 664 | static struct console mc_console = { .name = "mc", |
| 665 | .write = console_write, |
Jeff Dike | a174b30 | 2006-01-11 12:17:28 -0800 | [diff] [blame] | 666 | .flags = CON_ENABLED, |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 667 | .index = -1 }; |
| 668 | |
| 669 | static int mc_add_console(void) |
| 670 | { |
| 671 | register_console(&mc_console); |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | late_initcall(mc_add_console); |
| 676 | |
| 677 | static void with_console(struct mc_request *req, void (*proc)(void *), |
| 678 | void *arg) |
| 679 | { |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 680 | struct mconsole_output entry; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 681 | unsigned long flags; |
| 682 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 683 | entry.req = req; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 684 | spin_lock_irqsave(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 685 | list_add(&entry.list, &clients); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 686 | spin_unlock_irqrestore(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 687 | |
| 688 | (*proc)(arg); |
| 689 | |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 690 | mconsole_reply_len(req, "", 0, 0, 0); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 691 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 692 | spin_lock_irqsave(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 693 | list_del(&entry.list); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 694 | spin_unlock_irqrestore(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 695 | } |
| 696 | |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 697 | #ifdef CONFIG_MAGIC_SYSRQ |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 698 | |
| 699 | #include <linux/sysrq.h> |
| 700 | |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 701 | static void sysrq_proc(void *arg) |
| 702 | { |
| 703 | char *op = arg; |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 704 | handle_sysrq(*op, NULL); |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 705 | } |
| 706 | |
| 707 | void mconsole_sysrq(struct mc_request *req) |
| 708 | { |
| 709 | char *ptr = req->request.data; |
| 710 | |
| 711 | ptr += strlen("sysrq"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 712 | while (isspace(*ptr)) ptr++; |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 713 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 714 | /* |
| 715 | * With 'b', the system will shut down without a chance to reply, |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 716 | * so in this case, we reply first. |
| 717 | */ |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 718 | if (*ptr == 'b') |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 719 | mconsole_reply(req, "", 0, 0); |
| 720 | |
| 721 | with_console(req, sysrq_proc, ptr); |
| 722 | } |
| 723 | #else |
| 724 | void mconsole_sysrq(struct mc_request *req) |
| 725 | { |
| 726 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); |
| 727 | } |
| 728 | #endif |
| 729 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 730 | static void stack_proc(void *arg) |
| 731 | { |
| 732 | struct task_struct *from = current, *to = arg; |
| 733 | |
| 734 | to->thread.saved_task = from; |
| 735 | switch_to(from, to, from); |
| 736 | } |
| 737 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 738 | /* |
| 739 | * Mconsole stack trace |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 740 | * Added by Allan Graves, Jeff Dike |
| 741 | * Dumps a stacks registers to the linux console. |
| 742 | * Usage stack <pid>. |
| 743 | */ |
Jeff Dike | 42fda66 | 2007-10-16 01:26:50 -0700 | [diff] [blame] | 744 | void mconsole_stack(struct mc_request *req) |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 745 | { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 746 | char *ptr = req->request.data; |
| 747 | int pid_requested= -1; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 748 | struct task_struct *to = NULL; |
| 749 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 750 | /* |
| 751 | * Would be nice: |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 752 | * 1) Send showregs output to mconsole. |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 753 | * 2) Add a way to stack dump all pids. |
| 754 | */ |
| 755 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 756 | ptr += strlen("stack"); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 757 | while (isspace(*ptr)) |
| 758 | ptr++; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 759 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 760 | /* |
| 761 | * Should really check for multiple pids or reject bad args here |
| 762 | */ |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 763 | /* What do the arguments in mconsole_reply mean? */ |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 764 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 765 | mconsole_reply(req, "Please specify a pid", 1, 0); |
| 766 | return; |
| 767 | } |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 768 | |
Jeff Dike | 827b3f6 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 769 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 770 | if ((to == NULL) || (pid_requested == 0)) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 771 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
| 772 | return; |
| 773 | } |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 774 | with_console(req, stack_proc, to); |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 775 | } |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 776 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 777 | /* |
| 778 | * Changed by mconsole_setup, which is __setup, and called before SMP is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | * active. |
| 780 | */ |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 781 | static char *notify_socket = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Jeff Dike | 97a1fcb | 2007-07-23 18:43:48 -0700 | [diff] [blame] | 783 | static int __init mconsole_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | { |
| 785 | /* long to avoid size mismatch warnings from gcc */ |
| 786 | long sock; |
| 787 | int err; |
| 788 | char file[256]; |
| 789 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 790 | if (umid_file_name("mconsole", file, sizeof(file))) |
| 791 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
| 793 | |
| 794 | sock = os_create_unix_socket(file, sizeof(file), 1); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 795 | if (sock < 0) { |
| 796 | printk(KERN_ERR "Failed to initialize management console\n"); |
| 797 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
Jeff Dike | 438ee67 | 2008-02-04 22:31:19 -0800 | [diff] [blame] | 799 | if (os_set_fd_block(sock, 0)) |
| 800 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
| 802 | register_reboot_notifier(&reboot_notifier); |
| 803 | |
| 804 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, |
Thomas Gleixner | bd6aa65 | 2006-07-01 19:29:27 -0700 | [diff] [blame] | 805 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | "mconsole", (void *)sock); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 807 | if (err) { |
| 808 | printk(KERN_ERR "Failed to get IRQ for management console\n"); |
Jeff Dike | 438ee67 | 2008-02-04 22:31:19 -0800 | [diff] [blame] | 809 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | } |
| 811 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 812 | if (notify_socket != NULL) { |
Jeff Dike | 970d6e3 | 2006-01-06 00:18:48 -0800 | [diff] [blame] | 813 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 814 | if (notify_socket != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 816 | mconsole_socket_name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | strlen(mconsole_socket_name) + 1); |
| 818 | else printk(KERN_ERR "mconsole_setup failed to strdup " |
| 819 | "string\n"); |
| 820 | } |
| 821 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 822 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | MCONSOLE_VERSION, mconsole_socket_name); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 824 | return 0; |
Jeff Dike | 438ee67 | 2008-02-04 22:31:19 -0800 | [diff] [blame] | 825 | |
| 826 | out: |
| 827 | os_close_file(sock); |
| 828 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | __initcall(mconsole_init); |
| 832 | |
| 833 | static int write_proc_mconsole(struct file *file, const char __user *buffer, |
| 834 | unsigned long count, void *data) |
| 835 | { |
| 836 | char *buf; |
| 837 | |
| 838 | buf = kmalloc(count + 1, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 839 | if (buf == NULL) |
| 840 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 842 | if (copy_from_user(buf, buffer, count)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | count = -EFAULT; |
| 844 | goto out; |
| 845 | } |
| 846 | |
| 847 | buf[count] = '\0'; |
| 848 | |
| 849 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); |
| 850 | out: |
| 851 | kfree(buf); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 852 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | } |
| 854 | |
| 855 | static int create_proc_mconsole(void) |
| 856 | { |
| 857 | struct proc_dir_entry *ent; |
| 858 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 859 | if (notify_socket == NULL) |
| 860 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
| 862 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 863 | if (ent == NULL) { |
| 864 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " |
| 865 | "failed\n"); |
| 866 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | |
| 869 | ent->read_proc = NULL; |
| 870 | ent->write_proc = write_proc_mconsole; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 871 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | } |
| 873 | |
| 874 | static DEFINE_SPINLOCK(notify_spinlock); |
| 875 | |
| 876 | void lock_notify(void) |
| 877 | { |
| 878 | spin_lock(¬ify_spinlock); |
| 879 | } |
| 880 | |
| 881 | void unlock_notify(void) |
| 882 | { |
| 883 | spin_unlock(¬ify_spinlock); |
| 884 | } |
| 885 | |
| 886 | __initcall(create_proc_mconsole); |
| 887 | |
Jeff Dike | 088bec4 | 2007-10-16 01:27:20 -0700 | [diff] [blame] | 888 | #define NOTIFY "notify:" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
| 890 | static int mconsole_setup(char *str) |
| 891 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 892 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | str += strlen(NOTIFY); |
| 894 | notify_socket = str; |
| 895 | } |
| 896 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 897 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | } |
| 899 | |
Jeff Dike | 088bec4 | 2007-10-16 01:27:20 -0700 | [diff] [blame] | 900 | __setup("mconsole=", mconsole_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
| 902 | __uml_help(mconsole_setup, |
| 903 | "mconsole=notify:<socket>\n" |
| 904 | " Requests that the mconsole driver send a message to the named Unix\n" |
| 905 | " socket containing the name of the mconsole socket. This also serves\n" |
| 906 | " to notify outside processes when UML has booted far enough to respond\n" |
| 907 | " to mconsole requests.\n\n" |
| 908 | ); |
| 909 | |
| 910 | static int notify_panic(struct notifier_block *self, unsigned long unused1, |
| 911 | void *ptr) |
| 912 | { |
| 913 | char *message = ptr; |
| 914 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 915 | if (notify_socket == NULL) |
| 916 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 918 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | strlen(message) + 1); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 920 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | } |
| 922 | |
| 923 | static struct notifier_block panic_exit_notifier = { |
| 924 | .notifier_call = notify_panic, |
| 925 | .next = NULL, |
| 926 | .priority = 1 |
| 927 | }; |
| 928 | |
| 929 | static int add_notifier(void) |
| 930 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 931 | atomic_notifier_chain_register(&panic_notifier_list, |
| 932 | &panic_exit_notifier); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 933 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | } |
| 935 | |
| 936 | __initcall(add_notifier); |
| 937 | |
| 938 | char *mconsole_notify_socket(void) |
| 939 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 940 | return notify_socket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | } |
| 942 | |
| 943 | EXPORT_SYMBOL(mconsole_notify_socket); |