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> |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 9 | #include <linux/string.h> |
Jeff Dike | 827b3f6 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/list.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/notifier.h> |
| 15 | #include <linux/reboot.h> |
| 16 | #include <linux/proc_fs.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/syscalls.h> |
| 19 | #include <linux/utsname.h> |
Balbir Singh | 3613712 | 2008-12-09 13:14:07 -0800 | [diff] [blame] | 20 | #include <linux/socket.h> |
| 21 | #include <linux/un.h> |
Jeff Dike | 827b3f6 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 22 | #include <linux/workqueue.h> |
| 23 | #include <linux/mutex.h> |
| 24 | #include <asm/uaccess.h> |
| 25 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 26 | #include "init.h" |
| 27 | #include "irq_kern.h" |
| 28 | #include "irq_user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "kern_util.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "mconsole.h" |
| 31 | #include "mconsole_kern.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "os.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 34 | static int do_unlink_socket(struct notifier_block *notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | unsigned long what, void *data) |
| 36 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 37 | return mconsole_unlink_socket(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | |
| 41 | static struct notifier_block reboot_notifier = { |
| 42 | .notifier_call = do_unlink_socket, |
| 43 | .priority = 0, |
| 44 | }; |
| 45 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 46 | /* Safe without explicit locking for now. Tasklets provide their own |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | * locking, and the interrupt handler is safe because it can't interrupt |
| 48 | * itself and it can only happen on CPU 0. |
| 49 | */ |
| 50 | |
Jeff Dike | 9010772 | 2006-01-06 00:18:54 -0800 | [diff] [blame] | 51 | static LIST_HEAD(mc_requests); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 53 | static void mc_work_proc(struct work_struct *unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
| 55 | struct mconsole_entry *req; |
| 56 | unsigned long flags; |
| 57 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 58 | while (!list_empty(&mc_requests)) { |
Paolo 'Blaisorblade' Giarrusso | dbdb4c0 | 2006-04-10 22:53:39 -0700 | [diff] [blame] | 59 | local_irq_save(flags); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 60 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | list_del(&req->list); |
| 62 | local_irq_restore(flags); |
| 63 | req->request.cmd->handler(&req->request); |
| 64 | kfree(req); |
| 65 | } |
| 66 | } |
| 67 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 68 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 70 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | { |
| 72 | /* long to avoid size mismatch warnings from gcc */ |
| 73 | long fd; |
| 74 | struct mconsole_entry *new; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 75 | static struct mc_request req; /* that's OK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | fd = (long) dev_id; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 78 | while (mconsole_get_request(fd, &req)) { |
| 79 | if (req.cmd->context == MCONSOLE_INTR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | (*req.cmd->handler)(&req); |
| 81 | else { |
Jeff Dike | 60baa15 | 2006-04-10 22:53:28 -0700 | [diff] [blame] | 82 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 83 | if (new == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | mconsole_reply(&req, "Out of memory", 1, 0); |
| 85 | else { |
| 86 | new->request = req; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 87 | new->request.regs = get_irq_regs()->regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | list_add(&new->list, &mc_requests); |
| 89 | } |
| 90 | } |
| 91 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 92 | if (!list_empty(&mc_requests)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | schedule_work(&mconsole_work); |
| 94 | reactivate_fd(fd, MCONSOLE_IRQ); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 95 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | void mconsole_version(struct mc_request *req) |
| 99 | { |
| 100 | char version[256]; |
| 101 | |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 102 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 103 | utsname()->nodename, utsname()->release, utsname()->version, |
| 104 | utsname()->machine); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | mconsole_reply(req, version, 0, 0); |
| 106 | } |
| 107 | |
| 108 | void mconsole_log(struct mc_request *req) |
| 109 | { |
| 110 | int len; |
| 111 | char *ptr = req->request.data; |
| 112 | |
| 113 | ptr += strlen("log "); |
| 114 | |
| 115 | len = req->len - (ptr - req->request.data); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 116 | printk(KERN_WARNING "%.*s", len, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | mconsole_reply(req, "", 0, 0); |
| 118 | } |
| 119 | |
| 120 | /* This is a more convoluted version of mconsole_proc, which has some stability |
| 121 | * problems; however, we need it fixed, because it is expected that UML users |
| 122 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still |
| 123 | * show the real procfs content, not the ones from hppfs.*/ |
| 124 | #if 0 |
| 125 | void mconsole_proc(struct mc_request *req) |
| 126 | { |
| 127 | struct nameidata nd; |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 128 | struct vfsmount *mnt = current->nsproxy->pid_ns->proc_mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | struct file *file; |
| 130 | int n, err; |
| 131 | char *ptr = req->request.data, *buf; |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 132 | mm_segment_t old_fs = get_fs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | ptr += strlen("proc"); |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 135 | ptr = skip_spaces(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 137 | err = vfs_path_lookup(mnt->mnt_root, mnt, ptr, LOOKUP_FOLLOW, &nd); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 138 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | mconsole_reply(req, "Failed to look up file", 1, 0); |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 140 | goto out; |
| 141 | } |
| 142 | |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 143 | err = may_open(&nd.path, MAY_READ, O_RDONLY); |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 144 | if (result) { |
| 145 | mconsole_reply(req, "Failed to open file", 1, 0); |
| 146 | path_put(&nd.path); |
| 147 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 150 | file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY, |
| 151 | current_cred()); |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 152 | err = PTR_ERR(file); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 153 | if (IS_ERR(file)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | mconsole_reply(req, "Failed to open file", 1, 0); |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 155 | path_put(&nd.path); |
| 156 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 160 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 162 | goto out_fput; |
| 163 | } |
| 164 | |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 165 | if (file->f_op->read) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | do { |
Al Viro | 4ecf09f | 2009-12-24 00:44:44 -0500 | [diff] [blame] | 167 | loff_t pos; |
| 168 | set_fs(KERNEL_DS); |
| 169 | n = vfs_read(file, buf, PAGE_SIZE - 1, &pos); |
| 170 | file_pos_write(file, pos); |
| 171 | set_fs(old_fs); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 172 | if (n >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | buf[n] = '\0'; |
| 174 | mconsole_reply(req, buf, 0, (n > 0)); |
| 175 | } |
| 176 | else { |
| 177 | mconsole_reply(req, "Read of file failed", |
| 178 | 1, 0); |
| 179 | goto out_free; |
| 180 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 181 | } while (n > 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | else mconsole_reply(req, "", 0, 0); |
| 184 | |
| 185 | out_free: |
| 186 | kfree(buf); |
| 187 | out_fput: |
| 188 | fput(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | out: ; |
| 190 | } |
| 191 | #endif |
| 192 | |
| 193 | void mconsole_proc(struct mc_request *req) |
| 194 | { |
| 195 | char path[64]; |
| 196 | char *buf; |
| 197 | int len; |
| 198 | int fd; |
| 199 | int first_chunk = 1; |
| 200 | char *ptr = req->request.data; |
| 201 | |
| 202 | ptr += strlen("proc"); |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 203 | ptr = skip_spaces(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
| 205 | |
| 206 | fd = sys_open(path, 0, 0); |
| 207 | if (fd < 0) { |
| 208 | mconsole_reply(req, "Failed to open file", 1, 0); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 209 | printk(KERN_ERR "open %s: %d\n",path,fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | goto out; |
| 211 | } |
| 212 | |
| 213 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 214 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 216 | goto out_close; |
| 217 | } |
| 218 | |
| 219 | for (;;) { |
| 220 | len = sys_read(fd, buf, PAGE_SIZE-1); |
| 221 | if (len < 0) { |
| 222 | mconsole_reply(req, "Read of file failed", 1, 0); |
| 223 | goto out_free; |
| 224 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 225 | /* Begin the file content on his own line. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | if (first_chunk) { |
| 227 | mconsole_reply(req, "\n", 0, 1); |
| 228 | first_chunk = 0; |
| 229 | } |
| 230 | if (len == PAGE_SIZE-1) { |
| 231 | buf[len] = '\0'; |
| 232 | mconsole_reply(req, buf, 0, 1); |
| 233 | } else { |
| 234 | buf[len] = '\0'; |
| 235 | mconsole_reply(req, buf, 0, 0); |
| 236 | break; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | out_free: |
| 241 | kfree(buf); |
| 242 | out_close: |
| 243 | sys_close(fd); |
| 244 | out: |
| 245 | /* nothing */; |
| 246 | } |
| 247 | |
| 248 | #define UML_MCONSOLE_HELPTEXT \ |
| 249 | "Commands: \n\ |
| 250 | version - Get kernel version \n\ |
| 251 | help - Print this message \n\ |
| 252 | halt - Halt UML \n\ |
| 253 | reboot - Reboot UML \n\ |
| 254 | config <dev>=<config> - Add a new device to UML; \n\ |
| 255 | same syntax as command line \n\ |
| 256 | config <dev> - Query the configuration of a device \n\ |
| 257 | remove <dev> - Remove a device from UML \n\ |
| 258 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ |
Jeff Dike | db80581 | 2006-02-01 03:06:23 -0800 | [diff] [blame] | 259 | cad - invoke the Ctrl-Alt-Del handler \n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
| 261 | go - continue the UML after a 'stop' \n\ |
| 262 | log <string> - make UML enter <string> into the kernel log\n\ |
| 263 | proc <file> - returns the contents of the UML's /proc/<file>\n\ |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 264 | stack <pid> - returns the stack of the specified pid\n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | " |
| 266 | |
| 267 | void mconsole_help(struct mc_request *req) |
| 268 | { |
| 269 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); |
| 270 | } |
| 271 | |
| 272 | void mconsole_halt(struct mc_request *req) |
| 273 | { |
| 274 | mconsole_reply(req, "", 0, 0); |
| 275 | machine_halt(); |
| 276 | } |
| 277 | |
| 278 | void mconsole_reboot(struct mc_request *req) |
| 279 | { |
| 280 | mconsole_reply(req, "", 0, 0); |
| 281 | machine_restart(NULL); |
| 282 | } |
| 283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | void mconsole_cad(struct mc_request *req) |
| 285 | { |
| 286 | mconsole_reply(req, "", 0, 0); |
| 287 | ctrl_alt_del(); |
| 288 | } |
| 289 | |
| 290 | void mconsole_go(struct mc_request *req) |
| 291 | { |
| 292 | mconsole_reply(req, "Not stopped", 1, 0); |
| 293 | } |
| 294 | |
| 295 | void mconsole_stop(struct mc_request *req) |
| 296 | { |
| 297 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 298 | os_set_fd_block(req->originating_fd, 1); |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 299 | mconsole_reply(req, "stopped", 0, 0); |
Karol Swietlicki | cc0be0f | 2008-02-04 22:31:25 -0800 | [diff] [blame] | 300 | for (;;) { |
| 301 | if (!mconsole_get_request(req->originating_fd, req)) |
| 302 | continue; |
Al Viro | 3a51237 | 2006-10-24 11:15:29 +0100 | [diff] [blame] | 303 | if (req->cmd->handler == mconsole_go) |
| 304 | break; |
| 305 | if (req->cmd->handler == mconsole_stop) { |
| 306 | mconsole_reply(req, "Already stopped", 1, 0); |
| 307 | continue; |
| 308 | } |
| 309 | if (req->cmd->handler == mconsole_sysrq) { |
| 310 | struct pt_regs *old_regs; |
| 311 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); |
| 312 | mconsole_sysrq(req); |
| 313 | set_irq_regs(old_regs); |
| 314 | continue; |
| 315 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | (*req->cmd->handler)(req); |
| 317 | } |
| 318 | os_set_fd_block(req->originating_fd, 0); |
| 319 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 320 | mconsole_reply(req, "", 0, 0); |
| 321 | } |
| 322 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 323 | static DEFINE_SPINLOCK(mc_devices_lock); |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 324 | static LIST_HEAD(mconsole_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | void mconsole_register_dev(struct mc_device *new) |
| 327 | { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 328 | spin_lock(&mc_devices_lock); |
| 329 | BUG_ON(!list_empty(&new->list)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | list_add(&new->list, &mconsole_devices); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 331 | spin_unlock(&mc_devices_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | static struct mc_device *mconsole_find_dev(char *name) |
| 335 | { |
| 336 | struct list_head *ele; |
| 337 | struct mc_device *dev; |
| 338 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 339 | list_for_each(ele, &mconsole_devices) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | dev = list_entry(ele, struct mc_device, list); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 341 | if (!strncmp(name, dev->name, strlen(dev->name))) |
| 342 | return dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 344 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 347 | #define UNPLUGGED_PER_PAGE \ |
| 348 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) |
| 349 | |
| 350 | struct unplugged_pages { |
| 351 | struct list_head list; |
| 352 | void *pages[UNPLUGGED_PER_PAGE]; |
| 353 | }; |
| 354 | |
Daniel Walker | e98fa28 | 2008-02-04 22:31:27 -0800 | [diff] [blame] | 355 | static DEFINE_MUTEX(plug_mem_mutex); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 356 | static unsigned long long unplugged_pages_count = 0; |
Jeff Dike | c59bce6 | 2007-02-10 01:44:04 -0800 | [diff] [blame] | 357 | static LIST_HEAD(unplugged_pages); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 358 | static int unplug_index = UNPLUGGED_PER_PAGE; |
| 359 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 360 | static int mem_config(char *str, char **error_out) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 361 | { |
| 362 | unsigned long long diff; |
| 363 | int err = -EINVAL, i, add; |
| 364 | char *ret; |
| 365 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 366 | if (str[0] != '=') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 367 | *error_out = "Expected '=' after 'mem'"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 368 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 369 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 370 | |
| 371 | str++; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 372 | if (str[0] == '-') |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 373 | add = 0; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 374 | else if (str[0] == '+') { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 375 | add = 1; |
| 376 | } |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 377 | else { |
| 378 | *error_out = "Expected increment to start with '-' or '+'"; |
| 379 | goto out; |
| 380 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 381 | |
| 382 | str++; |
| 383 | diff = memparse(str, &ret); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 384 | if (*ret != '\0') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 385 | *error_out = "Failed to parse memory increment"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 386 | goto out; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 387 | } |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 388 | |
| 389 | diff /= PAGE_SIZE; |
| 390 | |
Daniel Walker | e98fa28 | 2008-02-04 22:31:27 -0800 | [diff] [blame] | 391 | mutex_lock(&plug_mem_mutex); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 392 | for (i = 0; i < diff; i++) { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 393 | struct unplugged_pages *unplugged; |
| 394 | void *addr; |
| 395 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 396 | if (add) { |
| 397 | if (list_empty(&unplugged_pages)) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 398 | break; |
| 399 | |
| 400 | unplugged = list_entry(unplugged_pages.next, |
| 401 | struct unplugged_pages, list); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 402 | if (unplug_index > 0) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 403 | addr = unplugged->pages[--unplug_index]; |
| 404 | else { |
| 405 | list_del(&unplugged->list); |
| 406 | addr = unplugged; |
| 407 | unplug_index = UNPLUGGED_PER_PAGE; |
| 408 | } |
| 409 | |
| 410 | free_page((unsigned long) addr); |
| 411 | unplugged_pages_count--; |
| 412 | } |
| 413 | else { |
| 414 | struct page *page; |
| 415 | |
| 416 | page = alloc_page(GFP_ATOMIC); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 417 | if (page == NULL) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 418 | break; |
| 419 | |
| 420 | unplugged = page_address(page); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 421 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 422 | list_add(&unplugged->list, &unplugged_pages); |
| 423 | unplug_index = 0; |
| 424 | } |
| 425 | else { |
| 426 | struct list_head *entry = unplugged_pages.next; |
| 427 | addr = unplugged; |
| 428 | |
| 429 | unplugged = list_entry(entry, |
| 430 | struct unplugged_pages, |
| 431 | list); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 432 | err = os_drop_memory(addr, PAGE_SIZE); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 433 | if (err) { |
| 434 | printk(KERN_ERR "Failed to release " |
| 435 | "memory - errno = %d\n", err); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 436 | *error_out = "Failed to release memory"; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 437 | goto out_unlock; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 438 | } |
| 439 | unplugged->pages[unplug_index++] = addr; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | unplugged_pages_count++; |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | err = 0; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 447 | out_unlock: |
Daniel Walker | e98fa28 | 2008-02-04 22:31:27 -0800 | [diff] [blame] | 448 | mutex_unlock(&plug_mem_mutex); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 449 | out: |
| 450 | return err; |
| 451 | } |
| 452 | |
| 453 | static int mem_get_config(char *name, char *str, int size, char **error_out) |
| 454 | { |
| 455 | char buf[sizeof("18446744073709551615")]; |
| 456 | int len = 0; |
| 457 | |
| 458 | sprintf(buf, "%ld", uml_physmem); |
| 459 | CONFIG_CHUNK(str, size, len, buf, 1); |
| 460 | |
| 461 | return len; |
| 462 | } |
| 463 | |
| 464 | static int mem_id(char **str, int *start_out, int *end_out) |
| 465 | { |
| 466 | *start_out = 0; |
| 467 | *end_out = 0; |
| 468 | |
| 469 | return 0; |
| 470 | } |
| 471 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 472 | static int mem_remove(int n, char **error_out) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 473 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 474 | *error_out = "Memory doesn't support the remove operation"; |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 475 | return -EBUSY; |
| 476 | } |
| 477 | |
| 478 | static struct mc_device mem_mc = { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 479 | .list = LIST_HEAD_INIT(mem_mc.list), |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 480 | .name = "mem", |
| 481 | .config = mem_config, |
| 482 | .get_config = mem_get_config, |
| 483 | .id = mem_id, |
| 484 | .remove = mem_remove, |
| 485 | }; |
| 486 | |
Jeff Dike | 97a1fcb | 2007-07-23 18:43:48 -0700 | [diff] [blame] | 487 | static int __init mem_mc_init(void) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 488 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 489 | if (can_drop_memory()) |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 490 | mconsole_register_dev(&mem_mc); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 491 | else printk(KERN_ERR "Can't release memory to the host - memory " |
| 492 | "hotplug won't be supported\n"); |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | __initcall(mem_mc_init); |
| 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | #define CONFIG_BUF_SIZE 64 |
| 499 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 500 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | char **), |
| 502 | struct mc_request *req, char *name) |
| 503 | { |
| 504 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; |
| 505 | int n, size; |
| 506 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 507 | if (get_config == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
| 509 | return; |
| 510 | } |
| 511 | |
| 512 | error = NULL; |
Jeff Dike | 91b165c | 2006-09-25 23:33:00 -0700 | [diff] [blame] | 513 | size = ARRAY_SIZE(default_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | buf = default_buf; |
| 515 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 516 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | n = (*get_config)(name, buf, size, &error); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 518 | if (error != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | mconsole_reply(req, error, 1, 0); |
| 520 | goto out; |
| 521 | } |
| 522 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 523 | if (n <= size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | mconsole_reply(req, buf, 0, 0); |
| 525 | goto out; |
| 526 | } |
| 527 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 528 | if (buf != default_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | kfree(buf); |
| 530 | |
| 531 | size = n; |
| 532 | buf = kmalloc(size, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 533 | if (buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 535 | return; |
| 536 | } |
| 537 | } |
| 538 | out: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 539 | if (buf != default_buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | void mconsole_config(struct mc_request *req) |
| 544 | { |
| 545 | struct mc_device *dev; |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 546 | char *ptr = req->request.data, *name, *error_string = ""; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | int err; |
| 548 | |
| 549 | ptr += strlen("config"); |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 550 | ptr = skip_spaces(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | dev = mconsole_find_dev(ptr); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 552 | if (dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | mconsole_reply(req, "Bad configuration option", 1, 0); |
| 554 | return; |
| 555 | } |
| 556 | |
| 557 | name = &ptr[strlen(dev->name)]; |
| 558 | ptr = name; |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 559 | while ((*ptr != '=') && (*ptr != '\0')) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | ptr++; |
| 561 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 562 | if (*ptr == '=') { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 563 | err = (*dev->config)(name, &error_string); |
| 564 | mconsole_reply(req, error_string, err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | } |
| 566 | else mconsole_get_config(dev->get_config, req, name); |
| 567 | } |
| 568 | |
| 569 | void mconsole_remove(struct mc_request *req) |
| 570 | { |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 571 | struct mc_device *dev; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 572 | char *ptr = req->request.data, *err_msg = ""; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 573 | char error[256]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 574 | int err, start, end, n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
| 576 | ptr += strlen("remove"); |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 577 | ptr = skip_spaces(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | dev = mconsole_find_dev(ptr); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 579 | if (dev == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | mconsole_reply(req, "Bad remove option", 1, 0); |
| 581 | return; |
| 582 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 583 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 584 | ptr = &ptr[strlen(dev->name)]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 585 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 586 | err = 1; |
| 587 | n = (*dev->id)(&ptr, &start, &end); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 588 | if (n < 0) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 589 | err_msg = "Couldn't parse device number"; |
| 590 | goto out; |
| 591 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 592 | else if ((n < start) || (n > end)) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 593 | sprintf(error, "Invalid device number - must be between " |
| 594 | "%d and %d", start, end); |
| 595 | err_msg = error; |
| 596 | goto out; |
| 597 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 598 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 599 | err_msg = NULL; |
| 600 | err = (*dev->remove)(n, &err_msg); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 601 | switch(err) { |
Jeff Dike | d40f6d7 | 2007-03-29 01:20:28 -0700 | [diff] [blame] | 602 | case 0: |
| 603 | err_msg = ""; |
| 604 | break; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 605 | case -ENODEV: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 606 | if (err_msg == NULL) |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 607 | err_msg = "Device doesn't exist"; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 608 | break; |
| 609 | case -EBUSY: |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 610 | if (err_msg == NULL) |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 611 | err_msg = "Device is currently open"; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 612 | break; |
| 613 | default: |
| 614 | break; |
| 615 | } |
| 616 | out: |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 617 | mconsole_reply(req, err_msg, err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
| 619 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 620 | struct mconsole_output { |
| 621 | struct list_head list; |
| 622 | struct mc_request *req; |
| 623 | }; |
| 624 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 625 | static DEFINE_SPINLOCK(client_lock); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 626 | static LIST_HEAD(clients); |
| 627 | static char console_buf[MCONSOLE_MAX_DATA]; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 628 | |
| 629 | static void console_write(struct console *console, const char *string, |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 630 | unsigned int len) |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 631 | { |
| 632 | struct list_head *ele; |
| 633 | int n; |
| 634 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 635 | if (list_empty(&clients)) |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 636 | return; |
| 637 | |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 638 | while (len > 0) { |
| 639 | n = min((size_t) len, ARRAY_SIZE(console_buf)); |
| 640 | strncpy(console_buf, string, n); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 641 | string += n; |
| 642 | len -= n; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 643 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 644 | list_for_each(ele, &clients) { |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 645 | struct mconsole_output *entry; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 646 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 647 | entry = list_entry(ele, struct mconsole_output, list); |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 648 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 649 | } |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 650 | } |
| 651 | } |
| 652 | |
| 653 | static struct console mc_console = { .name = "mc", |
| 654 | .write = console_write, |
Jeff Dike | a174b30 | 2006-01-11 12:17:28 -0800 | [diff] [blame] | 655 | .flags = CON_ENABLED, |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 656 | .index = -1 }; |
| 657 | |
| 658 | static int mc_add_console(void) |
| 659 | { |
| 660 | register_console(&mc_console); |
| 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | late_initcall(mc_add_console); |
| 665 | |
| 666 | static void with_console(struct mc_request *req, void (*proc)(void *), |
| 667 | void *arg) |
| 668 | { |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 669 | struct mconsole_output entry; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 670 | unsigned long flags; |
| 671 | |
Jeff Dike | f92afe5 | 2006-09-29 01:58:52 -0700 | [diff] [blame] | 672 | entry.req = req; |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 673 | spin_lock_irqsave(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 674 | list_add(&entry.list, &clients); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 675 | spin_unlock_irqrestore(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 676 | |
| 677 | (*proc)(arg); |
| 678 | |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 679 | mconsole_reply_len(req, "", 0, 0, 0); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 680 | |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 681 | spin_lock_irqsave(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 682 | list_del(&entry.list); |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 683 | spin_unlock_irqrestore(&client_lock, flags); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 684 | } |
| 685 | |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 686 | #ifdef CONFIG_MAGIC_SYSRQ |
Jeff Dike | 54fa0ba | 2007-10-16 01:27:17 -0700 | [diff] [blame] | 687 | |
| 688 | #include <linux/sysrq.h> |
| 689 | |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 690 | static void sysrq_proc(void *arg) |
| 691 | { |
| 692 | char *op = arg; |
Al Viro | 7bea96f | 2006-10-08 22:49:34 +0100 | [diff] [blame] | 693 | handle_sysrq(*op, NULL); |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 694 | } |
| 695 | |
| 696 | void mconsole_sysrq(struct mc_request *req) |
| 697 | { |
| 698 | char *ptr = req->request.data; |
| 699 | |
| 700 | ptr += strlen("sysrq"); |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 701 | ptr = skip_spaces(ptr); |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 702 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 703 | /* |
| 704 | * With 'b', the system will shut down without a chance to reply, |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 705 | * so in this case, we reply first. |
| 706 | */ |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 707 | if (*ptr == 'b') |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 708 | mconsole_reply(req, "", 0, 0); |
| 709 | |
| 710 | with_console(req, sysrq_proc, ptr); |
| 711 | } |
| 712 | #else |
| 713 | void mconsole_sysrq(struct mc_request *req) |
| 714 | { |
| 715 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); |
| 716 | } |
| 717 | #endif |
| 718 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 719 | static void stack_proc(void *arg) |
| 720 | { |
| 721 | struct task_struct *from = current, *to = arg; |
| 722 | |
| 723 | to->thread.saved_task = from; |
| 724 | switch_to(from, to, from); |
| 725 | } |
| 726 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 727 | /* |
| 728 | * Mconsole stack trace |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 729 | * Added by Allan Graves, Jeff Dike |
| 730 | * Dumps a stacks registers to the linux console. |
| 731 | * Usage stack <pid>. |
| 732 | */ |
Jeff Dike | 42fda66 | 2007-10-16 01:26:50 -0700 | [diff] [blame] | 733 | void mconsole_stack(struct mc_request *req) |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 734 | { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 735 | char *ptr = req->request.data; |
| 736 | int pid_requested= -1; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 737 | struct task_struct *to = NULL; |
| 738 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 739 | /* |
| 740 | * Would be nice: |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 741 | * 1) Send showregs output to mconsole. |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 742 | * 2) Add a way to stack dump all pids. |
| 743 | */ |
| 744 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 745 | ptr += strlen("stack"); |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 746 | ptr = skip_spaces(ptr); |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 747 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 748 | /* |
| 749 | * Should really check for multiple pids or reject bad args here |
| 750 | */ |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 751 | /* What do the arguments in mconsole_reply mean? */ |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 752 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 753 | mconsole_reply(req, "Please specify a pid", 1, 0); |
| 754 | return; |
| 755 | } |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 756 | |
Jeff Dike | 827b3f6 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 757 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 758 | if ((to == NULL) || (pid_requested == 0)) { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 759 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
| 760 | return; |
| 761 | } |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 762 | with_console(req, stack_proc, to); |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 763 | } |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 764 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 765 | /* |
| 766 | * Changed by mconsole_setup, which is __setup, and called before SMP is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | * active. |
| 768 | */ |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 769 | static char *notify_socket = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Jeff Dike | 97a1fcb | 2007-07-23 18:43:48 -0700 | [diff] [blame] | 771 | static int __init mconsole_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | { |
| 773 | /* long to avoid size mismatch warnings from gcc */ |
| 774 | long sock; |
| 775 | int err; |
Balbir Singh | 3613712 | 2008-12-09 13:14:07 -0800 | [diff] [blame] | 776 | char file[UNIX_PATH_MAX]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 778 | if (umid_file_name("mconsole", file, sizeof(file))) |
| 779 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
| 781 | |
| 782 | sock = os_create_unix_socket(file, sizeof(file), 1); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 783 | if (sock < 0) { |
| 784 | printk(KERN_ERR "Failed to initialize management console\n"); |
| 785 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
Jeff Dike | 438ee67 | 2008-02-04 22:31:19 -0800 | [diff] [blame] | 787 | if (os_set_fd_block(sock, 0)) |
| 788 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
| 790 | register_reboot_notifier(&reboot_notifier); |
| 791 | |
| 792 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, |
Thomas Gleixner | bd6aa65 | 2006-07-01 19:29:27 -0700 | [diff] [blame] | 793 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | "mconsole", (void *)sock); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 795 | if (err) { |
| 796 | printk(KERN_ERR "Failed to get IRQ for management console\n"); |
Jeff Dike | 438ee67 | 2008-02-04 22:31:19 -0800 | [diff] [blame] | 797 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 800 | if (notify_socket != NULL) { |
Jeff Dike | 970d6e3 | 2006-01-06 00:18:48 -0800 | [diff] [blame] | 801 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 802 | if (notify_socket != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 804 | mconsole_socket_name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | strlen(mconsole_socket_name) + 1); |
| 806 | else printk(KERN_ERR "mconsole_setup failed to strdup " |
| 807 | "string\n"); |
| 808 | } |
| 809 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 810 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | MCONSOLE_VERSION, mconsole_socket_name); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 812 | return 0; |
Jeff Dike | 438ee67 | 2008-02-04 22:31:19 -0800 | [diff] [blame] | 813 | |
| 814 | out: |
| 815 | os_close_file(sock); |
| 816 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | __initcall(mconsole_init); |
| 820 | |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 821 | static ssize_t mconsole_proc_write(struct file *file, |
| 822 | const char __user *buffer, size_t count, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | { |
| 824 | char *buf; |
| 825 | |
| 826 | buf = kmalloc(count + 1, GFP_KERNEL); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 827 | if (buf == NULL) |
| 828 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 830 | if (copy_from_user(buf, buffer, count)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | count = -EFAULT; |
| 832 | goto out; |
| 833 | } |
| 834 | |
| 835 | buf[count] = '\0'; |
| 836 | |
| 837 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); |
| 838 | out: |
| 839 | kfree(buf); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 840 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | } |
| 842 | |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 843 | static const struct file_operations mconsole_proc_fops = { |
| 844 | .owner = THIS_MODULE, |
| 845 | .write = mconsole_proc_write, |
| 846 | }; |
| 847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Alexey Dobriyan | 6613c5e | 2009-12-14 18:00:11 -0800 | [diff] [blame] | 855 | ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops); |
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 | } |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 861 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } |
| 863 | |
| 864 | static DEFINE_SPINLOCK(notify_spinlock); |
| 865 | |
| 866 | void lock_notify(void) |
| 867 | { |
| 868 | spin_lock(¬ify_spinlock); |
| 869 | } |
| 870 | |
| 871 | void unlock_notify(void) |
| 872 | { |
| 873 | spin_unlock(¬ify_spinlock); |
| 874 | } |
| 875 | |
| 876 | __initcall(create_proc_mconsole); |
| 877 | |
Jeff Dike | 088bec4 | 2007-10-16 01:27:20 -0700 | [diff] [blame] | 878 | #define NOTIFY "notify:" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | static int mconsole_setup(char *str) |
| 881 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 882 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | str += strlen(NOTIFY); |
| 884 | notify_socket = str; |
| 885 | } |
| 886 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 887 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | } |
| 889 | |
Jeff Dike | 088bec4 | 2007-10-16 01:27:20 -0700 | [diff] [blame] | 890 | __setup("mconsole=", mconsole_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | |
| 892 | __uml_help(mconsole_setup, |
| 893 | "mconsole=notify:<socket>\n" |
| 894 | " Requests that the mconsole driver send a message to the named Unix\n" |
| 895 | " socket containing the name of the mconsole socket. This also serves\n" |
| 896 | " to notify outside processes when UML has booted far enough to respond\n" |
| 897 | " to mconsole requests.\n\n" |
| 898 | ); |
| 899 | |
| 900 | static int notify_panic(struct notifier_block *self, unsigned long unused1, |
| 901 | void *ptr) |
| 902 | { |
| 903 | char *message = ptr; |
| 904 | |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 905 | if (notify_socket == NULL) |
| 906 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 908 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | strlen(message) + 1); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 910 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | static struct notifier_block panic_exit_notifier = { |
| 914 | .notifier_call = notify_panic, |
| 915 | .next = NULL, |
| 916 | .priority = 1 |
| 917 | }; |
| 918 | |
| 919 | static int add_notifier(void) |
| 920 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 921 | atomic_notifier_chain_register(&panic_notifier_list, |
| 922 | &panic_exit_notifier); |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 923 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
| 925 | |
| 926 | __initcall(add_notifier); |
| 927 | |
| 928 | char *mconsole_notify_socket(void) |
| 929 | { |
Jeff Dike | ae2587e | 2007-10-16 01:26:57 -0700 | [diff] [blame] | 930 | return notify_socket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } |
| 932 | |
| 933 | EXPORT_SYMBOL(mconsole_notify_socket); |