blob: 8d80b27502e6ae4feb235d01801a67be5ca8cce4 [file] [log] [blame]
Jeff Dike165dc592006-01-06 00:18:57 -08001/*
Jeff Dike2f8a2dc2007-10-16 01:26:43 -07002 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Licensed under the GPL
4 */
5
Al Viro37185b32012-10-08 03:27:32 +01006#include <linux/irqreturn.h>
7#include <linux/kd.h>
Ingo Molnar3f07c012017-02-08 18:51:30 +01008#include <linux/sched/signal.h>
Al Viro37185b32012-10-08 03:27:32 +01009#include <linux/slab.h>
Ingo Molnar3f07c012017-02-08 18:51:30 +010010
Al Viro510c72a32011-08-18 20:08:29 +010011#include "chan.h"
Al Viro37185b32012-10-08 03:27:32 +010012#include <irq_kern.h>
13#include <irq_user.h>
14#include <kern_util.h>
15#include <os.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#define LINE_BUFSIZE 4096
18
Al Viro7bea96f2006-10-08 22:49:34 +010019static irqreturn_t line_interrupt(int irq, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070020{
Jeff Dike165dc592006-01-06 00:18:57 -080021 struct chan *chan = data;
22 struct line *line = chan->line;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24 if (line)
Jiri Slaby2e124b42013-01-03 15:53:06 +010025 chan_interrupt(line, irq);
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 return IRQ_HANDLED;
28}
29
Jeff Dike2f8a2dc2007-10-16 01:26:43 -070030/*
31 * Returns the free space inside the ring buffer of this line.
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070032 *
Simon Arlottb60745b2007-10-20 01:23:03 +020033 * Should be called while holding line->lock (this does not modify data).
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070034 */
35static int write_room(struct line *line)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
37 int n;
38
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070039 if (line->buffer == NULL)
40 return LINE_BUFSIZE - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070042 /* This is for the case where the buffer is wrapped! */
43 n = line->head - line->tail;
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 if (n <= 0)
Jeff Dikeacb2cf32008-02-04 22:30:42 -080046 n += LINE_BUFSIZE; /* The other case */
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070047 return n - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048}
49
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070050int line_write_room(struct tty_struct *tty)
51{
52 struct line *line = tty->driver_data;
53 unsigned long flags;
54 int room;
55
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070056 spin_lock_irqsave(&line->lock, flags);
57 room = write_room(line);
58 spin_unlock_irqrestore(&line->lock, flags);
59
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070060 return room;
61}
62
63int line_chars_in_buffer(struct tty_struct *tty)
64{
65 struct line *line = tty->driver_data;
66 unsigned long flags;
67 int ret;
68
69 spin_lock_irqsave(&line->lock, flags);
Jeff Dikeacb2cf32008-02-04 22:30:42 -080070 /* write_room subtracts 1 for the needed NULL, so we readd it.*/
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -070071 ret = LINE_BUFSIZE - (write_room(line) + 1);
72 spin_unlock_irqrestore(&line->lock, flags);
73
74 return ret;
75}
76
77/*
78 * This copies the content of buf into the circular buffer associated with
79 * this line.
80 * The return value is the number of characters actually copied, i.e. the ones
81 * for which there was space: this function is not supposed to ever flush out
82 * the circular buffer.
83 *
84 * Must be called while holding line->lock!
85 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086static int buffer_data(struct line *line, const char *buf, int len)
87{
88 int end, room;
89
Jeff Dike2f8a2dc2007-10-16 01:26:43 -070090 if (line->buffer == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
92 if (line->buffer == NULL) {
Jeff Dike2f8a2dc2007-10-16 01:26:43 -070093 printk(KERN_ERR "buffer_data - atomic allocation "
94 "failed\n");
95 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 }
97 line->head = line->buffer;
98 line->tail = line->buffer;
99 }
100
101 room = write_room(line);
102 len = (len > room) ? room : len;
103
104 end = line->buffer + LINE_BUFSIZE - line->tail;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700105
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700106 if (len < end) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 memcpy(line->tail, buf, len);
108 line->tail += len;
Jeff Diked50084a2006-01-06 00:18:50 -0800109 }
110 else {
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700111 /* The circular buffer is wrapping */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 memcpy(line->tail, buf, end);
113 buf += end;
114 memcpy(line->buffer, buf, len - end);
115 line->tail = line->buffer + len - end;
116 }
117
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700118 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700121/*
122 * Flushes the ring buffer to the output channels. That is, write_chan is
123 * called, passing it line->head as buffer, and an appropriate count.
124 *
125 * On exit, returns 1 when the buffer is empty,
126 * 0 when the buffer is not empty on exit,
127 * and -errno when an error occurred.
128 *
129 * Must be called while holding line->lock!*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130static int flush_buffer(struct line *line)
131{
132 int n, count;
133
134 if ((line->buffer == NULL) || (line->head == line->tail))
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700135 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 if (line->tail < line->head) {
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700138 /* line->buffer + LINE_BUFSIZE is the end of the buffer! */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 count = line->buffer + LINE_BUFSIZE - line->head;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700140
Al Virobed5e392011-09-08 10:49:34 -0400141 n = write_chan(line->chan_out, line->head, count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 line->driver->write_irq);
143 if (n < 0)
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700144 return n;
145 if (n == count) {
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700146 /*
147 * We have flushed from ->head to buffer end, now we
148 * must flush only from the beginning to ->tail.
149 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 line->head = line->buffer;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700151 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 line->head += n;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700153 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
155 }
156
157 count = line->tail - line->head;
Al Virobed5e392011-09-08 10:49:34 -0400158 n = write_chan(line->chan_out, line->head, count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 line->driver->write_irq);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700160
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700161 if (n < 0)
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700162 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
164 line->head += n;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700165 return line->head == line->tail;
166}
167
168void line_flush_buffer(struct tty_struct *tty)
169{
170 struct line *line = tty->driver_data;
171 unsigned long flags;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700172
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700173 spin_lock_irqsave(&line->lock, flags);
Richard Weinbergerf1c93e42011-07-25 17:12:55 -0700174 flush_buffer(line);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700175 spin_unlock_irqrestore(&line->lock, flags);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700176}
177
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700178/*
179 * We map both ->flush_chars and ->put_char (which go in pair) onto
180 * ->flush_buffer and ->write. Hope it's not that bad.
181 */
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700182void line_flush_chars(struct tty_struct *tty)
183{
184 line_flush_buffer(tty);
185}
186
WANG Cong3168cb92008-05-06 20:42:33 -0700187int line_put_char(struct tty_struct *tty, unsigned char ch)
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700188{
WANG Cong3168cb92008-05-06 20:42:33 -0700189 return line_write(tty, &ch, sizeof(ch));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
193{
194 struct line *line = tty->driver_data;
195 unsigned long flags;
Jeff Dikec59dbca2007-10-16 01:26:42 -0700196 int n, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700198 spin_lock_irqsave(&line->lock, flags);
Jeff Dikec59dbca2007-10-16 01:26:42 -0700199 if (line->head != line->tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 ret = buffer_data(line, buf, len);
Jeff Dikec59dbca2007-10-16 01:26:42 -0700201 else {
Al Virobed5e392011-09-08 10:49:34 -0400202 n = write_chan(line->chan_out, buf, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 line->driver->write_irq);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700204 if (n < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 ret = n;
206 goto out_up;
207 }
208
209 len -= n;
210 ret += n;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700211 if (len > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 ret += buffer_data(line, buf + n, len);
213 }
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700214out_up:
215 spin_unlock_irqrestore(&line->lock, flags);
216 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
218
Alan Cox606d0992006-12-08 02:38:45 -0800219void line_set_termios(struct tty_struct *tty, struct ktermios * old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 /* nothing */
222}
223
Jeff Dikee4dcee82006-01-06 00:18:58 -0800224void line_throttle(struct tty_struct *tty)
225{
226 struct line *line = tty->driver_data;
227
Al Virobed5e392011-09-08 10:49:34 -0400228 deactivate_chan(line->chan_in, line->driver->read_irq);
Jeff Dikee4dcee82006-01-06 00:18:58 -0800229 line->throttled = 1;
230}
231
232void line_unthrottle(struct tty_struct *tty)
233{
234 struct line *line = tty->driver_data;
235
236 line->throttled = 0;
Jiri Slaby2e124b42013-01-03 15:53:06 +0100237 chan_interrupt(line, line->driver->read_irq);
Jeff Dikee4dcee82006-01-06 00:18:58 -0800238
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700239 /*
240 * Maybe there is enough stuff pending that calling the interrupt
Jeff Dikee4dcee82006-01-06 00:18:58 -0800241 * throttles us again. In this case, line->throttled will be 1
242 * again and we shouldn't turn the interrupt back on.
243 */
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700244 if (!line->throttled)
Al Virobed5e392011-09-08 10:49:34 -0400245 reactivate_chan(line->chan_in, line->driver->read_irq);
Jeff Dikee4dcee82006-01-06 00:18:58 -0800246}
247
Al Viro7bea96f2006-10-08 22:49:34 +0100248static irqreturn_t line_write_interrupt(int irq, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Jeff Dike165dc592006-01-06 00:18:57 -0800250 struct chan *chan = data;
251 struct line *line = chan->line;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 int err;
253
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700254 /*
Yong Zhangc0b79a92011-09-22 16:58:46 +0800255 * Interrupts are disabled here because genirq keep irqs disabled when
256 * calling the action handler.
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700257 */
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700258
Paolo 'Blaisorblade' Giarrussoec0ac8a2007-03-07 20:41:12 -0800259 spin_lock(&line->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 err = flush_buffer(line);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700261 if (err == 0) {
Al Viro199eebb2012-02-11 03:05:32 -0500262 spin_unlock(&line->lock);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700263 return IRQ_NONE;
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700264 } else if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 line->head = line->buffer;
266 line->tail = line->buffer;
267 }
Paolo 'Blaisorblade' Giarrussoec0ac8a2007-03-07 20:41:12 -0800268 spin_unlock(&line->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Jiri Slaby6aad04f2013-03-07 13:12:29 +0100270 tty_port_tty_wakeup(&line->port);
Jiri Slaby6fc58842012-06-04 13:35:27 +0200271
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700272 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273}
274
Jeff Dike165dc592006-01-06 00:18:57 -0800275int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Jeff Dike5e7672e2006-09-27 01:50:33 -0700277 const struct line_driver *driver = line->driver;
Theodore Ts'oaab94462012-07-17 14:18:23 -0400278 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700280 if (input)
281 err = um_request_irq(driver->read_irq, fd, IRQ_READ,
Theodore Ts'oaab94462012-07-17 14:18:23 -0400282 line_interrupt, IRQF_SHARED,
283 driver->read_irq_name, data);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700284 if (err)
285 return err;
286 if (output)
Anton Ivanovff6a1792017-11-20 21:17:58 +0000287 err = um_request_irq(driver->write_irq, fd, IRQ_NONE,
Theodore Ts'oaab94462012-07-17 14:18:23 -0400288 line_write_interrupt, IRQF_SHARED,
289 driver->write_irq_name, data);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700290 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
Richard Weinberger79e02732012-06-04 21:57:24 +0200293static int line_activate(struct tty_port *port, struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Richard Weinberger79e02732012-06-04 21:57:24 +0200295 int ret;
296 struct line *line = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Richard Weinberger79e02732012-06-04 21:57:24 +0200298 ret = enable_chan(line);
299 if (ret)
300 return ret;
Jeff Diked14ad812007-07-15 23:38:54 -0700301
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700302 if (!line->sigio) {
Richard Weinberger2116bda2013-03-11 10:05:45 +0100303 chan_enable_winch(line->chan_out, port);
Jeff Diked79a5802007-02-10 01:43:52 -0800304 line->sigio = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 }
306
Al Virobed5e392011-09-08 10:49:34 -0400307 chan_window_size(line, &tty->winsize.ws_row,
Richard Weinberger79e02732012-06-04 21:57:24 +0200308 &tty->winsize.ws_col);
309
310 return 0;
311}
312
Richard Weinbergercc4f0242013-03-11 10:03:42 +0100313static void unregister_winch(struct tty_struct *tty);
314
315static void line_destruct(struct tty_port *port)
316{
317 struct tty_struct *tty = tty_port_tty_get(port);
318 struct line *line = tty->driver_data;
319
320 if (line->sigio) {
321 unregister_winch(tty);
322 line->sigio = 0;
323 }
324}
325
Richard Weinberger79e02732012-06-04 21:57:24 +0200326static const struct tty_port_operations line_port_ops = {
327 .activate = line_activate,
Richard Weinbergercc4f0242013-03-11 10:03:42 +0100328 .destruct = line_destruct,
Richard Weinberger79e02732012-06-04 21:57:24 +0200329};
330
331int line_open(struct tty_struct *tty, struct file *filp)
332{
333 struct line *line = tty->driver_data;
334
335 return tty_port_open(&line->port, tty, filp);
336}
337
338int line_install(struct tty_driver *driver, struct tty_struct *tty,
339 struct line *line)
340{
341 int ret;
342
343 ret = tty_standard_install(driver, tty);
344 if (ret)
345 return ret;
346
347 tty->driver_data = line;
348
349 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}
351
Richard Weinberger79e02732012-06-04 21:57:24 +0200352void line_close(struct tty_struct *tty, struct file * filp)
353{
354 struct line *line = tty->driver_data;
355
356 tty_port_close(&line->port, tty, filp);
357}
358
359void line_hangup(struct tty_struct *tty)
360{
361 struct line *line = tty->driver_data;
362
363 tty_port_hangup(&line->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
365
366void close_lines(struct line *lines, int nlines)
367{
368 int i;
369
370 for(i = 0; i < nlines; i++)
Al Viro10c890c02011-09-10 08:39:18 -0400371 close_chan(&lines[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372}
373
Al Viro04292b22011-09-09 20:07:05 -0400374int setup_one_line(struct line *lines, int n, char *init,
375 const struct chan_opts *opts, char **error_out)
Jeff Diked79a5802007-02-10 01:43:52 -0800376{
377 struct line *line = &lines[n];
Al Virocfe6b7c2011-09-09 19:45:42 -0400378 struct tty_driver *driver = line->driver->driver;
Jeff Dikef28169d2007-02-10 01:43:53 -0800379 int err = -EINVAL;
Jeff Diked79a5802007-02-10 01:43:52 -0800380
Jiri Slaby060ed312012-06-04 13:35:26 +0200381 if (line->port.count) {
Jeff Dikef28169d2007-02-10 01:43:53 -0800382 *error_out = "Device is already open";
Jeff Diked79a5802007-02-10 01:43:52 -0800383 goto out;
384 }
385
Al Viro31efceb2011-09-09 19:14:02 -0400386 if (!strcmp(init, "none")) {
387 if (line->valid) {
388 line->valid = 0;
389 kfree(line->init_str);
Al Virocfe6b7c2011-09-09 19:45:42 -0400390 tty_unregister_device(driver, n);
Al Viro31efceb2011-09-09 19:14:02 -0400391 parse_chan_pair(NULL, line, n, opts, error_out);
392 err = 0;
393 }
394 } else {
395 char *new = kstrdup(init, GFP_KERNEL);
396 if (!new) {
397 *error_out = "Failed to allocate memory";
398 return -ENOMEM;
399 }
Al Viroc8e28762011-09-09 20:08:48 -0400400 if (line->valid) {
Al Virocfe6b7c2011-09-09 19:45:42 -0400401 tty_unregister_device(driver, n);
Al Viroc8e28762011-09-09 20:08:48 -0400402 kfree(line->init_str);
403 }
Al Viro31efceb2011-09-09 19:14:02 -0400404 line->init_str = new;
Al Viro43574c12011-09-09 17:25:00 -0400405 line->valid = 1;
Al Viro31efceb2011-09-09 19:14:02 -0400406 err = parse_chan_pair(new, line, n, opts, error_out);
Al Virocfe6b7c2011-09-09 19:45:42 -0400407 if (!err) {
Jiri Slaby734cc172012-08-07 21:47:47 +0200408 struct device *d = tty_port_register_device(&line->port,
409 driver, n, NULL);
Al Virocfe6b7c2011-09-09 19:45:42 -0400410 if (IS_ERR(d)) {
411 *error_out = "Failed to register device";
412 err = PTR_ERR(d);
413 parse_chan_pair(NULL, line, n, opts, error_out);
414 }
415 }
Al Viro31efceb2011-09-09 19:14:02 -0400416 if (err) {
417 line->init_str = NULL;
418 line->valid = 0;
419 kfree(new);
420 }
Jeff Diked79a5802007-02-10 01:43:52 -0800421 }
422out:
Jeff Dikef28169d2007-02-10 01:43:53 -0800423 return err;
Jeff Diked79a5802007-02-10 01:43:52 -0800424}
425
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700426/*
427 * Common setup code for both startup command line and mconsole initialization.
Matt LaPlante4b3f6862006-10-03 22:21:02 +0200428 * @lines contains the array (of size @num) to modify;
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700429 * @init is the setup string;
Jeff Dikef28169d2007-02-10 01:43:53 -0800430 * @error_out is an error string in the case of failure;
Jeff Diked571cd12006-01-06 00:18:53 -0800431 */
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700432
Al Viro43574c12011-09-09 17:25:00 -0400433int line_setup(char **conf, unsigned int num, char **def,
434 char *init, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
Al Viro43574c12011-09-09 17:25:00 -0400436 char *error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700438 if (*init == '=') {
439 /*
440 * We said con=/ssl= instead of con#=, so we are configuring all
441 * consoles at once.
442 */
Al Viro43574c12011-09-09 17:25:00 -0400443 *def = init + 1;
444 } else {
445 char *end;
446 unsigned n = simple_strtoul(init, &end, 0);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700447
Al Viro43574c12011-09-09 17:25:00 -0400448 if (*end != '=') {
449 error = "Couldn't parse device number";
450 goto out;
Jeff Dikef28169d2007-02-10 01:43:53 -0800451 }
Al Viro43574c12011-09-09 17:25:00 -0400452 if (n >= num) {
453 error = "Device number out of range";
454 goto out;
455 }
456 conf[n] = end + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 }
Al Viro43574c12011-09-09 17:25:00 -0400458 return 0;
459
460out:
461 printk(KERN_ERR "Failed to set up %s with "
462 "configuration string \"%s\" : %s\n", name, init, error);
463 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
Jeff Dike1f801712006-01-06 00:18:55 -0800466int line_config(struct line *lines, unsigned int num, char *str,
Jeff Dikef28169d2007-02-10 01:43:53 -0800467 const struct chan_opts *opts, char **error_out)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
Al Virofe9a6b02011-09-08 20:44:06 -0400469 char *end;
Al Viro31efceb2011-09-09 19:14:02 -0400470 int n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700472 if (*str == '=') {
Jeff Dikef28169d2007-02-10 01:43:53 -0800473 *error_out = "Can't configure all devices from mconsole";
474 return -EINVAL;
Jeff Diked571cd12006-01-06 00:18:53 -0800475 }
476
Al Virofe9a6b02011-09-08 20:44:06 -0400477 n = simple_strtoul(str, &end, 0);
478 if (*end++ != '=') {
479 *error_out = "Couldn't parse device number";
480 return -EINVAL;
481 }
482 if (n >= num) {
483 *error_out = "Device number out of range";
484 return -EINVAL;
485 }
486
Al Viro31efceb2011-09-09 19:14:02 -0400487 return setup_one_line(lines, n, end, opts, error_out);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
489
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700490int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 int size, char **error_out)
492{
493 struct line *line;
494 char *end;
495 int dev, n = 0;
496
497 dev = simple_strtoul(name, &end, 0);
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700498 if ((*end != '\0') || (end == name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 *error_out = "line_get_config failed to parse device number";
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700500 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
502
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700503 if ((dev < 0) || (dev >= num)) {
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700504 *error_out = "device number out of range";
505 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 }
507
508 line = &lines[dev];
509
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700510 if (!line->valid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 CONFIG_CHUNK(str, size, n, "none", 1);
Jiri Slaby6fc58842012-06-04 13:35:27 +0200512 else {
513 struct tty_struct *tty = tty_port_tty_get(&line->port);
514 if (tty == NULL) {
515 CONFIG_CHUNK(str, size, n, line->init_str, 1);
516 } else {
517 n = chan_config_string(line, str, size, error_out);
518 tty_kref_put(tty);
519 }
520 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700522 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
Jeff Dike29d56cf2005-06-25 14:55:25 -0700525int line_id(char **str, int *start_out, int *end_out)
526{
527 char *end;
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700528 int n;
Jeff Dike29d56cf2005-06-25 14:55:25 -0700529
530 n = simple_strtoul(*str, &end, 0);
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700531 if ((*end != '\0') || (end == *str))
532 return -1;
Jeff Dike29d56cf2005-06-25 14:55:25 -0700533
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700534 *str = end;
535 *start_out = n;
536 *end_out = n;
537 return n;
Jeff Dike29d56cf2005-06-25 14:55:25 -0700538}
539
Jeff Dikef28169d2007-02-10 01:43:53 -0800540int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
Al Viroda645f32011-09-08 20:34:52 -0400542 if (n >= num) {
543 *error_out = "Device number out of range";
544 return -EINVAL;
545 }
Al Viro31efceb2011-09-09 19:14:02 -0400546 return setup_one_line(lines, n, "none", NULL, error_out);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547}
548
Al Virocfe6b7c2011-09-09 19:45:42 -0400549int register_lines(struct line_driver *line_driver,
550 const struct tty_operations *ops,
551 struct line *lines, int nlines)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 struct tty_driver *driver = alloc_tty_driver(nlines);
Al Virocfe6b7c2011-09-09 19:45:42 -0400554 int err;
Al Viro04292b22011-09-09 20:07:05 -0400555 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 if (!driver)
Al Virocfe6b7c2011-09-09 19:45:42 -0400558 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
560 driver->driver_name = line_driver->name;
561 driver->name = line_driver->device_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 driver->major = line_driver->major;
563 driver->minor_start = line_driver->minor_start;
564 driver->type = line_driver->type;
565 driver->subtype = line_driver->subtype;
Al Virocfe6b7c2011-09-09 19:45:42 -0400566 driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 driver->init_termios = tty_std_termios;
Al Viro04292b22011-09-09 20:07:05 -0400568
569 for (i = 0; i < nlines; i++) {
Jiri Slaby060ed312012-06-04 13:35:26 +0200570 tty_port_init(&lines[i].port);
Richard Weinberger79e02732012-06-04 21:57:24 +0200571 lines[i].port.ops = &line_port_ops;
Al Viro04292b22011-09-09 20:07:05 -0400572 spin_lock_init(&lines[i].lock);
Al Viro04292b22011-09-09 20:07:05 -0400573 lines[i].driver = line_driver;
574 INIT_LIST_HEAD(&lines[i].chan_list);
575 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 tty_set_operations(driver, ops);
577
Al Virocfe6b7c2011-09-09 19:45:42 -0400578 err = tty_register_driver(driver);
579 if (err) {
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700580 printk(KERN_ERR "register_lines : can't register %s driver\n",
581 line_driver->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 put_tty_driver(driver);
Jiri Slaby191c5f12012-11-15 09:49:56 +0100583 for (i = 0; i < nlines; i++)
584 tty_port_destroy(&lines[i].port);
Al Virocfe6b7c2011-09-09 19:45:42 -0400585 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 }
587
Al Virocfe6b7c2011-09-09 19:45:42 -0400588 line_driver->driver = driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 mconsole_register_dev(&line_driver->mc);
Al Virocfe6b7c2011-09-09 19:45:42 -0400590 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
592
Jeff Dike90107722006-01-06 00:18:54 -0800593static DEFINE_SPINLOCK(winch_handler_lock);
594static LIST_HEAD(winch_handlers);
Paolo 'Blaisorblade' Giarrusso605a69a2005-07-07 17:56:52 -0700595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596struct winch {
597 struct list_head list;
598 int fd;
599 int tty_fd;
600 int pid;
Richard Weinberger2116bda2013-03-11 10:05:45 +0100601 struct tty_port *port;
Jeff Dike42a359e2007-07-15 23:38:55 -0700602 unsigned long stack;
Al Viro7cf3cf22011-09-14 16:21:31 -0700603 struct work_struct work;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604};
605
Al Viro7cf3cf22011-09-14 16:21:31 -0700606static void __free_winch(struct work_struct *work)
Jeff Dike42a359e2007-07-15 23:38:55 -0700607{
Al Viro7cf3cf22011-09-14 16:21:31 -0700608 struct winch *winch = container_of(work, struct winch, work);
Richard Weinbergerfa7a0442012-04-17 22:37:13 +0200609 um_free_irq(WINCH_IRQ, winch);
Jeff Dike42a359e2007-07-15 23:38:55 -0700610
611 if (winch->pid != -1)
612 os_kill_process(winch->pid, 1);
Jeff Dike42a359e2007-07-15 23:38:55 -0700613 if (winch->stack != 0)
614 free_stack(winch->stack, 0);
Jeff Dike42a359e2007-07-15 23:38:55 -0700615 kfree(winch);
616}
617
Al Viro7cf3cf22011-09-14 16:21:31 -0700618static void free_winch(struct winch *winch)
619{
620 int fd = winch->fd;
621 winch->fd = -1;
622 if (fd != -1)
623 os_close_file(fd);
624 list_del(&winch->list);
625 __free_winch(&winch->work);
626}
627
Al Viro7bea96f2006-10-08 22:49:34 +0100628static irqreturn_t winch_interrupt(int irq, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
630 struct winch *winch = data;
631 struct tty_struct *tty;
632 struct line *line;
Al Viro7cf3cf22011-09-14 16:21:31 -0700633 int fd = winch->fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 int err;
635 char c;
Peter Hurley8a8a5512014-10-16 14:59:44 -0400636 struct pid *pgrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Al Viro7cf3cf22011-09-14 16:21:31 -0700638 if (fd != -1) {
639 err = generic_read(fd, &c, NULL);
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700640 if (err < 0) {
641 if (err != -EAGAIN) {
Al Viro7cf3cf22011-09-14 16:21:31 -0700642 winch->fd = -1;
643 list_del(&winch->list);
644 os_close_file(fd);
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700645 printk(KERN_ERR "winch_interrupt : "
646 "read failed, errno = %d\n", -err);
647 printk(KERN_ERR "fd %d is losing SIGWINCH "
648 "support\n", winch->tty_fd);
Al Viro7cf3cf22011-09-14 16:21:31 -0700649 INIT_WORK(&winch->work, __free_winch);
650 schedule_work(&winch->work);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700651 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 }
653 goto out;
654 }
655 }
Richard Weinberger2116bda2013-03-11 10:05:45 +0100656 tty = tty_port_tty_get(winch->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (tty != NULL) {
658 line = tty->driver_data;
Jeff Dike438ee672008-02-04 22:31:19 -0800659 if (line != NULL) {
Al Virobed5e392011-09-08 10:49:34 -0400660 chan_window_size(line, &tty->winsize.ws_row,
Jeff Dike438ee672008-02-04 22:31:19 -0800661 &tty->winsize.ws_col);
Peter Hurley8a8a5512014-10-16 14:59:44 -0400662 pgrp = tty_get_pgrp(tty);
663 if (pgrp)
664 kill_pgrp(pgrp, SIGWINCH, 1);
665 put_pid(pgrp);
Jeff Dike438ee672008-02-04 22:31:19 -0800666 }
Richard Weinberger2116bda2013-03-11 10:05:45 +0100667 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 }
669 out:
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700670 if (winch->fd != -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 reactivate_fd(winch->fd, WINCH_IRQ);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700672 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
674
Richard Weinberger2116bda2013-03-11 10:05:45 +0100675void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port,
Jeff Dike42a359e2007-07-15 23:38:55 -0700676 unsigned long stack)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677{
678 struct winch *winch;
679
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 winch = kmalloc(sizeof(*winch), GFP_KERNEL);
681 if (winch == NULL) {
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700682 printk(KERN_ERR "register_winch_irq - kmalloc failed\n");
Jeff Dike42a359e2007-07-15 23:38:55 -0700683 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 }
Paolo 'Blaisorblade' Giarrusso605a69a2005-07-07 17:56:52 -0700685
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
687 .fd = fd,
688 .tty_fd = tty_fd,
689 .pid = pid,
Richard Weinberger2116bda2013-03-11 10:05:45 +0100690 .port = port,
Jeff Dike42a359e2007-07-15 23:38:55 -0700691 .stack = stack });
692
693 if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
Theodore Ts'oaab94462012-07-17 14:18:23 -0400694 IRQF_SHARED, "winch", winch) < 0) {
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700695 printk(KERN_ERR "register_winch_irq - failed to register "
696 "IRQ\n");
Jeff Dike42a359e2007-07-15 23:38:55 -0700697 goto out_free;
698 }
Paolo 'Blaisorblade' Giarrusso605a69a2005-07-07 17:56:52 -0700699
700 spin_lock(&winch_handler_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 list_add(&winch->list, &winch_handlers);
Paolo 'Blaisorblade' Giarrusso605a69a2005-07-07 17:56:52 -0700702 spin_unlock(&winch_handler_lock);
703
Jeff Dike42a359e2007-07-15 23:38:55 -0700704 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Jeff Dike42a359e2007-07-15 23:38:55 -0700706 out_free:
Jeff Dikee464bf22006-01-06 00:19:01 -0800707 kfree(winch);
Jeff Dike42a359e2007-07-15 23:38:55 -0700708 cleanup:
709 os_kill_process(pid, 1);
710 os_close_file(fd);
711 if (stack != 0)
712 free_stack(stack, 0);
Jeff Dikecd2ee4a2005-05-05 16:15:32 -0700713}
714
Jeff Dikee464bf22006-01-06 00:19:01 -0800715static void unregister_winch(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716{
Will Newton48a0b742011-01-12 16:59:26 -0800717 struct list_head *ele, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 struct winch *winch;
Richard Weinberger2116bda2013-03-11 10:05:45 +0100719 struct tty_struct *wtty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Jeff Dikee464bf22006-01-06 00:19:01 -0800721 spin_lock(&winch_handler_lock);
722
Will Newton48a0b742011-01-12 16:59:26 -0800723 list_for_each_safe(ele, next, &winch_handlers) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 winch = list_entry(ele, struct winch, list);
Richard Weinberger2116bda2013-03-11 10:05:45 +0100725 wtty = tty_port_tty_get(winch->port);
726 if (wtty == tty) {
Al Viro7cf3cf22011-09-14 16:21:31 -0700727 free_winch(winch);
Jeff Dikee464bf22006-01-06 00:19:01 -0800728 break;
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700729 }
Richard Weinberger2116bda2013-03-11 10:05:45 +0100730 tty_kref_put(wtty);
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700731 }
Jeff Dikee464bf22006-01-06 00:19:01 -0800732 spin_unlock(&winch_handler_lock);
733}
734
735static void winch_cleanup(void)
736{
737 struct list_head *ele, *next;
738 struct winch *winch;
739
740 spin_lock(&winch_handler_lock);
741
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700742 list_for_each_safe(ele, next, &winch_handlers) {
Jeff Dikee464bf22006-01-06 00:19:01 -0800743 winch = list_entry(ele, struct winch, list);
Al Viro7cf3cf22011-09-14 16:21:31 -0700744 free_winch(winch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 }
Jeff Dikee464bf22006-01-06 00:19:01 -0800746
747 spin_unlock(&winch_handler_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748}
749__uml_exitcall(winch_cleanup);
750
751char *add_xterm_umid(char *base)
752{
753 char *umid, *title;
754 int len;
755
Jeff Dike7eebe8a2006-01-06 00:19:01 -0800756 umid = get_umid();
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700757 if (*umid == '\0')
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700758 return base;
Jeff Dike165dc592006-01-06 00:18:57 -0800759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
761 title = kmalloc(len, GFP_KERNEL);
Jeff Dike2f8a2dc2007-10-16 01:26:43 -0700762 if (title == NULL) {
763 printk(KERN_ERR "Failed to allocate buffer for xterm title\n");
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700764 return base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 }
766
767 snprintf(title, len, "%s (%s)", base, umid);
Paolo 'Blaisorblade' Giarrussob97b77c2005-05-01 08:58:56 -0700768 return title;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}