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1da177e4 LT |
1 | /* -*- linux-c -*- |
2 | * | |
3 | * drivers/char/viocons.c | |
4 | * | |
5 | * iSeries Virtual Terminal | |
6 | * | |
7 | * Authors: Dave Boutcher <boutcher@us.ibm.com> | |
8 | * Ryan Arnold <ryanarn@us.ibm.com> | |
9 | * Colin Devilbiss <devilbis@us.ibm.com> | |
10 | * Stephen Rothwell <sfr@au1.ibm.com> | |
11 | * | |
12 | * (C) Copyright 2000, 2001, 2002, 2003, 2004 IBM Corporation | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of the | |
17 | * License, or (at your option) anyu later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, but | |
20 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
22 | * General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software Foundation, | |
26 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
27 | */ | |
1da177e4 LT |
28 | #include <linux/kernel.h> |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/vmalloc.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/console.h> | |
34 | #include <linux/module.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/wait.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <asm/ioctls.h> | |
40 | #include <linux/kd.h> | |
41 | #include <linux/tty.h> | |
42 | #include <linux/tty_flip.h> | |
43 | #include <linux/sysrq.h> | |
44 | ||
b4206778 | 45 | #include <asm/iseries/vio.h> |
e45423ea | 46 | #include <asm/iseries/hv_lp_event.h> |
c0a8d05c | 47 | #include <asm/iseries/hv_call_event.h> |
15b17189 | 48 | #include <asm/iseries/hv_lp_config.h> |
1da44037 | 49 | #include <asm/iseries/hv_call.h> |
1da177e4 LT |
50 | |
51 | #ifdef CONFIG_VT | |
52 | #error You must turn off CONFIG_VT to use CONFIG_VIOCONS | |
53 | #endif | |
54 | ||
55 | #define VIOTTY_MAGIC (0x0DCB) | |
56 | #define VTTY_PORTS 10 | |
57 | ||
58 | #define VIOCONS_KERN_WARN KERN_WARNING "viocons: " | |
59 | #define VIOCONS_KERN_INFO KERN_INFO "viocons: " | |
60 | ||
61 | static DEFINE_SPINLOCK(consolelock); | |
62 | static DEFINE_SPINLOCK(consoleloglock); | |
63 | ||
64 | #ifdef CONFIG_MAGIC_SYSRQ | |
65 | static int vio_sysrq_pressed; | |
66 | extern int sysrq_enabled; | |
67 | #endif | |
68 | ||
1da177e4 LT |
69 | #define VIOCHAR_NUM_BUF 16 |
70 | ||
71 | /* | |
72 | * Our port information. We store a pointer to one entry in the | |
73 | * tty_driver_data | |
74 | */ | |
75 | static struct port_info { | |
76 | int magic; | |
77 | struct tty_struct *tty; | |
78 | HvLpIndex lp; | |
79 | u8 vcons; | |
80 | u64 seq; /* sequence number of last HV send */ | |
81 | u64 ack; /* last ack from HV */ | |
82 | /* | |
83 | * When we get writes faster than we can send it to the partition, | |
84 | * buffer the data here. Note that used is a bit map of used buffers. | |
85 | * It had better have enough bits to hold VIOCHAR_NUM_BUF the bitops assume | |
86 | * it is a multiple of unsigned long | |
87 | */ | |
88 | unsigned long used; | |
89 | u8 *buffer[VIOCHAR_NUM_BUF]; | |
90 | int bufferBytes[VIOCHAR_NUM_BUF]; | |
91 | int curbuf; | |
92 | int bufferOverflow; | |
93 | int overflowMessage; | |
94 | } port_info[VTTY_PORTS]; | |
95 | ||
96 | #define viochar_is_console(pi) ((pi) == &port_info[0]) | |
97 | #define viochar_port(pi) ((pi) - &port_info[0]) | |
98 | ||
99 | static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp); | |
100 | ||
101 | static struct tty_driver *viotty_driver; | |
102 | ||
bf6a7112 | 103 | static void hvlog(char *fmt, ...) |
1da177e4 LT |
104 | { |
105 | int i; | |
106 | unsigned long flags; | |
107 | va_list args; | |
108 | static char buf[256]; | |
109 | ||
110 | spin_lock_irqsave(&consoleloglock, flags); | |
111 | va_start(args, fmt); | |
112 | i = vscnprintf(buf, sizeof(buf) - 1, fmt, args); | |
113 | va_end(args); | |
114 | buf[i++] = '\r'; | |
115 | HvCall_writeLogBuffer(buf, i); | |
116 | spin_unlock_irqrestore(&consoleloglock, flags); | |
117 | } | |
118 | ||
bf6a7112 | 119 | static void hvlogOutput(const char *buf, int count) |
1da177e4 LT |
120 | { |
121 | unsigned long flags; | |
122 | int begin; | |
123 | int index; | |
124 | static const char cr = '\r'; | |
125 | ||
126 | begin = 0; | |
127 | spin_lock_irqsave(&consoleloglock, flags); | |
128 | for (index = 0; index < count; index++) { | |
129 | if (buf[index] == '\n') { | |
130 | /* | |
131 | * Start right after the last '\n' or at the zeroth | |
132 | * array position and output the number of characters | |
133 | * including the newline. | |
134 | */ | |
135 | HvCall_writeLogBuffer(&buf[begin], index - begin + 1); | |
136 | begin = index + 1; | |
137 | HvCall_writeLogBuffer(&cr, 1); | |
138 | } | |
139 | } | |
140 | if ((index - begin) > 0) | |
141 | HvCall_writeLogBuffer(&buf[begin], index - begin); | |
142 | spin_unlock_irqrestore(&consoleloglock, flags); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Make sure we're pointing to a valid port_info structure. Shamelessly | |
147 | * plagerized from serial.c | |
148 | */ | |
149 | static inline int viotty_paranoia_check(struct port_info *pi, | |
150 | char *name, const char *routine) | |
151 | { | |
152 | static const char *bad_pi_addr = VIOCONS_KERN_WARN | |
153 | "warning: bad address for port_info struct (%s) in %s\n"; | |
154 | static const char *badmagic = VIOCONS_KERN_WARN | |
155 | "warning: bad magic number for port_info struct (%s) in %s\n"; | |
156 | ||
157 | if ((pi < &port_info[0]) || (viochar_port(pi) > VTTY_PORTS)) { | |
158 | printk(bad_pi_addr, name, routine); | |
159 | return 1; | |
160 | } | |
161 | if (pi->magic != VIOTTY_MAGIC) { | |
162 | printk(badmagic, name, routine); | |
163 | return 1; | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Add data to our pending-send buffers. | |
170 | * | |
171 | * NOTE: Don't use printk in here because it gets nastily recursive. | |
172 | * hvlog can be used to log to the hypervisor buffer | |
173 | */ | |
174 | static int buffer_add(struct port_info *pi, const char *buf, size_t len) | |
175 | { | |
176 | size_t bleft; | |
177 | size_t curlen; | |
178 | const char *curbuf; | |
179 | int nextbuf; | |
180 | ||
181 | curbuf = buf; | |
182 | bleft = len; | |
183 | while (bleft > 0) { | |
184 | /* | |
185 | * If there is no space left in the current buffer, we have | |
186 | * filled everything up, so return. If we filled the previous | |
187 | * buffer we would already have moved to the next one. | |
188 | */ | |
189 | if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) { | |
190 | hvlog ("\n\rviocons: No overflow buffer available for memcpy().\n"); | |
191 | pi->bufferOverflow++; | |
192 | pi->overflowMessage = 1; | |
193 | break; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Turn on the "used" bit for this buffer. If it's already on, | |
198 | * that's fine. | |
199 | */ | |
200 | set_bit(pi->curbuf, &pi->used); | |
201 | ||
202 | /* | |
203 | * See if this buffer has been allocated. If not, allocate it. | |
204 | */ | |
205 | if (pi->buffer[pi->curbuf] == NULL) { | |
206 | pi->buffer[pi->curbuf] = | |
207 | kmalloc(VIOCHAR_MAX_DATA, GFP_ATOMIC); | |
208 | if (pi->buffer[pi->curbuf] == NULL) { | |
209 | hvlog("\n\rviocons: kmalloc failed allocating spaces for buffer %d.", | |
210 | pi->curbuf); | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
215 | /* Figure out how much we can copy into this buffer. */ | |
216 | if (bleft < (VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf])) | |
217 | curlen = bleft; | |
218 | else | |
219 | curlen = VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf]; | |
220 | ||
221 | /* Copy the data into the buffer. */ | |
222 | memcpy(pi->buffer[pi->curbuf] + pi->bufferBytes[pi->curbuf], | |
223 | curbuf, curlen); | |
224 | ||
225 | pi->bufferBytes[pi->curbuf] += curlen; | |
226 | curbuf += curlen; | |
227 | bleft -= curlen; | |
228 | ||
229 | /* | |
230 | * Now see if we've filled this buffer. If not then | |
231 | * we'll try to use it again later. If we've filled it | |
232 | * up then we'll advance the curbuf to the next in the | |
233 | * circular queue. | |
234 | */ | |
235 | if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) { | |
236 | nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF; | |
237 | /* | |
238 | * Move to the next buffer if it hasn't been used yet | |
239 | */ | |
240 | if (test_bit(nextbuf, &pi->used) == 0) | |
241 | pi->curbuf = nextbuf; | |
242 | } | |
243 | } | |
244 | return len - bleft; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Send pending data | |
249 | * | |
250 | * NOTE: Don't use printk in here because it gets nastily recursive. | |
251 | * hvlog can be used to log to the hypervisor buffer | |
252 | */ | |
253 | static void send_buffers(struct port_info *pi) | |
254 | { | |
255 | HvLpEvent_Rc hvrc; | |
256 | int nextbuf; | |
257 | struct viocharlpevent *viochar; | |
258 | unsigned long flags; | |
259 | ||
260 | spin_lock_irqsave(&consolelock, flags); | |
261 | ||
262 | viochar = (struct viocharlpevent *) | |
263 | vio_get_event_buffer(viomajorsubtype_chario); | |
264 | ||
265 | /* Make sure we got a buffer */ | |
266 | if (viochar == NULL) { | |
267 | hvlog("\n\rviocons: Can't get viochar buffer in sendBuffers()."); | |
268 | spin_unlock_irqrestore(&consolelock, flags); | |
269 | return; | |
270 | } | |
271 | ||
272 | if (pi->used == 0) { | |
273 | hvlog("\n\rviocons: in sendbuffers(), but no buffers used.\n"); | |
274 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
275 | spin_unlock_irqrestore(&consolelock, flags); | |
276 | return; | |
277 | } | |
278 | ||
279 | /* | |
280 | * curbuf points to the buffer we're filling. We want to | |
281 | * start sending AFTER this one. | |
282 | */ | |
283 | nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF; | |
284 | ||
285 | /* | |
286 | * Loop until we find a buffer with the used bit on | |
287 | */ | |
288 | while (test_bit(nextbuf, &pi->used) == 0) | |
289 | nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF; | |
290 | ||
291 | initDataEvent(viochar, pi->lp); | |
292 | ||
293 | /* | |
294 | * While we have buffers with data, and our send window | |
295 | * is open, send them | |
296 | */ | |
297 | while ((test_bit(nextbuf, &pi->used)) && | |
298 | ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { | |
299 | viochar->len = pi->bufferBytes[nextbuf]; | |
300 | viochar->event.xCorrelationToken = pi->seq++; | |
301 | viochar->event.xSizeMinus1 = | |
302 | offsetof(struct viocharlpevent, data) + viochar->len; | |
303 | ||
304 | memcpy(viochar->data, pi->buffer[nextbuf], viochar->len); | |
305 | ||
306 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); | |
307 | if (hvrc) { | |
308 | /* | |
309 | * MUST unlock the spinlock before doing a printk | |
310 | */ | |
311 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
312 | spin_unlock_irqrestore(&consolelock, flags); | |
313 | ||
314 | printk(VIOCONS_KERN_WARN | |
315 | "error sending event! return code %d\n", | |
316 | (int)hvrc); | |
317 | return; | |
318 | } | |
319 | ||
320 | /* | |
321 | * clear the used bit, zero the number of bytes in | |
322 | * this buffer, and move to the next buffer | |
323 | */ | |
324 | clear_bit(nextbuf, &pi->used); | |
325 | pi->bufferBytes[nextbuf] = 0; | |
326 | nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF; | |
327 | } | |
328 | ||
329 | /* | |
330 | * If we have emptied all the buffers, start at 0 again. | |
331 | * this will re-use any allocated buffers | |
332 | */ | |
333 | if (pi->used == 0) { | |
334 | pi->curbuf = 0; | |
335 | ||
336 | if (pi->overflowMessage) | |
337 | pi->overflowMessage = 0; | |
338 | ||
339 | if (pi->tty) { | |
340 | tty_wakeup(pi->tty); | |
341 | } | |
342 | } | |
343 | ||
344 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
345 | spin_unlock_irqrestore(&consolelock, flags); | |
346 | } | |
347 | ||
348 | /* | |
349 | * Our internal writer. Gets called both from the console device and | |
350 | * the tty device. the tty pointer will be NULL if called from the console. | |
351 | * Return total number of bytes "written". | |
352 | * | |
353 | * NOTE: Don't use printk in here because it gets nastily recursive. hvlog | |
354 | * can be used to log to the hypervisor buffer | |
355 | */ | |
356 | static int internal_write(struct port_info *pi, const char *buf, size_t len) | |
357 | { | |
358 | HvLpEvent_Rc hvrc; | |
359 | size_t bleft; | |
360 | size_t curlen; | |
361 | const char *curbuf; | |
362 | unsigned long flags; | |
363 | struct viocharlpevent *viochar; | |
364 | ||
365 | /* | |
366 | * Write to the hvlog of inbound data are now done prior to | |
367 | * calling internal_write() since internal_write() is only called in | |
368 | * the event that an lp event path is active, which isn't the case for | |
369 | * logging attempts prior to console initialization. | |
370 | * | |
371 | * If there is already data queued for this port, send it prior to | |
372 | * attempting to send any new data. | |
373 | */ | |
374 | if (pi->used) | |
375 | send_buffers(pi); | |
376 | ||
377 | spin_lock_irqsave(&consolelock, flags); | |
378 | ||
379 | viochar = vio_get_event_buffer(viomajorsubtype_chario); | |
380 | if (viochar == NULL) { | |
381 | spin_unlock_irqrestore(&consolelock, flags); | |
382 | hvlog("\n\rviocons: Can't get vio buffer in internal_write()."); | |
383 | return -EAGAIN; | |
384 | } | |
385 | initDataEvent(viochar, pi->lp); | |
386 | ||
387 | curbuf = buf; | |
388 | bleft = len; | |
389 | ||
390 | while ((bleft > 0) && (pi->used == 0) && | |
391 | ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { | |
392 | if (bleft > VIOCHAR_MAX_DATA) | |
393 | curlen = VIOCHAR_MAX_DATA; | |
394 | else | |
395 | curlen = bleft; | |
396 | ||
397 | viochar->event.xCorrelationToken = pi->seq++; | |
398 | memcpy(viochar->data, curbuf, curlen); | |
399 | viochar->len = curlen; | |
400 | viochar->event.xSizeMinus1 = | |
401 | offsetof(struct viocharlpevent, data) + curlen; | |
402 | ||
403 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); | |
404 | if (hvrc) { | |
405 | hvlog("viocons: error sending event! %d\n", (int)hvrc); | |
406 | goto out; | |
407 | } | |
408 | curbuf += curlen; | |
409 | bleft -= curlen; | |
410 | } | |
411 | ||
412 | /* If we didn't send it all, buffer as much of it as we can. */ | |
413 | if (bleft > 0) | |
414 | bleft -= buffer_add(pi, curbuf, bleft); | |
415 | out: | |
416 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
417 | spin_unlock_irqrestore(&consolelock, flags); | |
418 | return len - bleft; | |
419 | } | |
420 | ||
421 | static struct port_info *get_port_data(struct tty_struct *tty) | |
422 | { | |
423 | unsigned long flags; | |
424 | struct port_info *pi; | |
425 | ||
426 | spin_lock_irqsave(&consolelock, flags); | |
427 | if (tty) { | |
428 | pi = (struct port_info *)tty->driver_data; | |
429 | if (!pi || viotty_paranoia_check(pi, tty->name, | |
430 | "get_port_data")) { | |
431 | pi = NULL; | |
432 | } | |
433 | } else | |
434 | /* | |
435 | * If this is the console device, use the lp from | |
436 | * the first port entry | |
437 | */ | |
438 | pi = &port_info[0]; | |
439 | spin_unlock_irqrestore(&consolelock, flags); | |
440 | return pi; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Initialize the common fields in a charLpEvent | |
445 | */ | |
446 | static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp) | |
447 | { | |
677f8c0d SR |
448 | struct HvLpEvent *hev = &viochar->event; |
449 | ||
1da177e4 LT |
450 | memset(viochar, 0, sizeof(struct viocharlpevent)); |
451 | ||
677f8c0d SR |
452 | hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK | |
453 | HV_LP_EVENT_INT; | |
454 | hev->xType = HvLpEvent_Type_VirtualIo; | |
455 | hev->xSubtype = viomajorsubtype_chario | viochardata; | |
456 | hev->xSourceLp = HvLpConfig_getLpIndex(); | |
457 | hev->xTargetLp = lp; | |
458 | hev->xSizeMinus1 = sizeof(struct viocharlpevent); | |
459 | hev->xSourceInstanceId = viopath_sourceinst(lp); | |
460 | hev->xTargetInstanceId = viopath_targetinst(lp); | |
1da177e4 LT |
461 | } |
462 | ||
463 | /* | |
464 | * early console device write | |
465 | */ | |
466 | static void viocons_write_early(struct console *co, const char *s, unsigned count) | |
467 | { | |
468 | hvlogOutput(s, count); | |
469 | } | |
470 | ||
471 | /* | |
472 | * console device write | |
473 | */ | |
474 | static void viocons_write(struct console *co, const char *s, unsigned count) | |
475 | { | |
476 | int index; | |
477 | int begin; | |
478 | struct port_info *pi; | |
479 | ||
480 | static const char cr = '\r'; | |
481 | ||
482 | /* | |
483 | * Check port data first because the target LP might be valid but | |
484 | * simply not active, in which case we want to hvlog the output. | |
485 | */ | |
486 | pi = get_port_data(NULL); | |
487 | if (pi == NULL) { | |
488 | hvlog("\n\rviocons_write: unable to get port data."); | |
489 | return; | |
490 | } | |
491 | ||
492 | hvlogOutput(s, count); | |
493 | ||
494 | if (!viopath_isactive(pi->lp)) | |
495 | return; | |
496 | ||
497 | /* | |
498 | * Any newline character found will cause a | |
499 | * carriage return character to be emitted as well. | |
500 | */ | |
501 | begin = 0; | |
502 | for (index = 0; index < count; index++) { | |
503 | if (s[index] == '\n') { | |
504 | /* | |
505 | * Newline found. Print everything up to and | |
506 | * including the newline | |
507 | */ | |
508 | internal_write(pi, &s[begin], index - begin + 1); | |
509 | begin = index + 1; | |
510 | /* Emit a carriage return as well */ | |
511 | internal_write(pi, &cr, 1); | |
512 | } | |
513 | } | |
514 | ||
515 | /* If any characters left to write, write them now */ | |
516 | if ((index - begin) > 0) | |
517 | internal_write(pi, &s[begin], index - begin); | |
518 | } | |
519 | ||
520 | /* | |
521 | * Work out the device associate with this console | |
522 | */ | |
523 | static struct tty_driver *viocons_device(struct console *c, int *index) | |
524 | { | |
525 | *index = c->index; | |
526 | return viotty_driver; | |
527 | } | |
528 | ||
529 | /* | |
530 | * console device I/O methods | |
531 | */ | |
532 | static struct console viocons_early = { | |
533 | .name = "viocons", | |
534 | .write = viocons_write_early, | |
535 | .flags = CON_PRINTBUFFER, | |
536 | .index = -1, | |
537 | }; | |
538 | ||
539 | static struct console viocons = { | |
540 | .name = "viocons", | |
541 | .write = viocons_write, | |
542 | .device = viocons_device, | |
543 | .flags = CON_PRINTBUFFER, | |
544 | .index = -1, | |
545 | }; | |
546 | ||
547 | /* | |
548 | * TTY Open method | |
549 | */ | |
550 | static int viotty_open(struct tty_struct *tty, struct file *filp) | |
551 | { | |
552 | int port; | |
553 | unsigned long flags; | |
554 | struct port_info *pi; | |
555 | ||
556 | port = tty->index; | |
557 | ||
558 | if ((port < 0) || (port >= VTTY_PORTS)) | |
559 | return -ENODEV; | |
560 | ||
561 | spin_lock_irqsave(&consolelock, flags); | |
562 | ||
563 | pi = &port_info[port]; | |
564 | /* If some other TTY is already connected here, reject the open */ | |
565 | if ((pi->tty) && (pi->tty != tty)) { | |
566 | spin_unlock_irqrestore(&consolelock, flags); | |
567 | printk(VIOCONS_KERN_WARN | |
568 | "attempt to open device twice from different ttys\n"); | |
569 | return -EBUSY; | |
570 | } | |
571 | tty->driver_data = pi; | |
572 | pi->tty = tty; | |
573 | spin_unlock_irqrestore(&consolelock, flags); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | /* | |
579 | * TTY Close method | |
580 | */ | |
581 | static void viotty_close(struct tty_struct *tty, struct file *filp) | |
582 | { | |
583 | unsigned long flags; | |
584 | struct port_info *pi; | |
585 | ||
586 | spin_lock_irqsave(&consolelock, flags); | |
587 | pi = (struct port_info *)tty->driver_data; | |
588 | ||
589 | if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_close")) { | |
590 | spin_unlock_irqrestore(&consolelock, flags); | |
591 | return; | |
592 | } | |
593 | if (tty->count == 1) | |
594 | pi->tty = NULL; | |
595 | spin_unlock_irqrestore(&consolelock, flags); | |
596 | } | |
597 | ||
598 | /* | |
599 | * TTY Write method | |
600 | */ | |
601 | static int viotty_write(struct tty_struct *tty, const unsigned char *buf, | |
602 | int count) | |
603 | { | |
604 | struct port_info *pi; | |
605 | ||
606 | pi = get_port_data(tty); | |
607 | if (pi == NULL) { | |
608 | hvlog("\n\rviotty_write: no port data."); | |
609 | return -ENODEV; | |
610 | } | |
611 | ||
612 | if (viochar_is_console(pi)) | |
613 | hvlogOutput(buf, count); | |
614 | ||
615 | /* | |
616 | * If the path to this LP is closed, don't bother doing anything more. | |
617 | * just dump the data on the floor and return count. For some reason | |
618 | * some user level programs will attempt to probe available tty's and | |
619 | * they'll attempt a viotty_write on an invalid port which maps to an | |
620 | * invalid target lp. If this is the case then ignore the | |
621 | * viotty_write call and, since the viopath isn't active to this | |
622 | * partition, return count. | |
623 | */ | |
624 | if (!viopath_isactive(pi->lp)) | |
625 | return count; | |
626 | ||
627 | return internal_write(pi, buf, count); | |
628 | } | |
629 | ||
630 | /* | |
631 | * TTY put_char method | |
632 | */ | |
633 | static void viotty_put_char(struct tty_struct *tty, unsigned char ch) | |
634 | { | |
635 | struct port_info *pi; | |
636 | ||
637 | pi = get_port_data(tty); | |
638 | if (pi == NULL) | |
639 | return; | |
640 | ||
641 | /* This will append '\r' as well if the char is '\n' */ | |
642 | if (viochar_is_console(pi)) | |
643 | hvlogOutput(&ch, 1); | |
644 | ||
645 | if (viopath_isactive(pi->lp)) | |
646 | internal_write(pi, &ch, 1); | |
647 | } | |
648 | ||
649 | /* | |
650 | * TTY write_room method | |
651 | */ | |
652 | static int viotty_write_room(struct tty_struct *tty) | |
653 | { | |
654 | int i; | |
655 | int room = 0; | |
656 | struct port_info *pi; | |
657 | unsigned long flags; | |
658 | ||
659 | spin_lock_irqsave(&consolelock, flags); | |
660 | pi = (struct port_info *)tty->driver_data; | |
661 | if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_write_room")) { | |
662 | spin_unlock_irqrestore(&consolelock, flags); | |
663 | return 0; | |
664 | } | |
665 | ||
666 | /* If no buffers are used, return the max size. */ | |
667 | if (pi->used == 0) { | |
668 | spin_unlock_irqrestore(&consolelock, flags); | |
669 | return VIOCHAR_MAX_DATA * VIOCHAR_NUM_BUF; | |
670 | } | |
671 | ||
672 | /* | |
673 | * We retain the spinlock because we want to get an accurate | |
674 | * count and it can change on us between each operation if we | |
675 | * don't hold the spinlock. | |
676 | */ | |
677 | for (i = 0; ((i < VIOCHAR_NUM_BUF) && (room < VIOCHAR_MAX_DATA)); i++) | |
678 | room += (VIOCHAR_MAX_DATA - pi->bufferBytes[i]); | |
679 | spin_unlock_irqrestore(&consolelock, flags); | |
680 | ||
681 | if (room > VIOCHAR_MAX_DATA) | |
682 | room = VIOCHAR_MAX_DATA; | |
683 | return room; | |
684 | } | |
685 | ||
686 | /* | |
687 | * TTY chars_in_buffer method | |
688 | */ | |
689 | static int viotty_chars_in_buffer(struct tty_struct *tty) | |
690 | { | |
691 | return 0; | |
692 | } | |
693 | ||
694 | static int viotty_ioctl(struct tty_struct *tty, struct file *file, | |
695 | unsigned int cmd, unsigned long arg) | |
696 | { | |
697 | switch (cmd) { | |
698 | /* | |
699 | * the ioctls below read/set the flags usually shown in the leds | |
700 | * don't use them - they will go away without warning | |
701 | */ | |
702 | case KDGETLED: | |
703 | case KDGKBLED: | |
704 | return put_user(0, (char *)arg); | |
705 | ||
706 | case KDSKBLED: | |
707 | return 0; | |
708 | } | |
709 | ||
710 | return n_tty_ioctl(tty, file, cmd, arg); | |
711 | } | |
712 | ||
713 | /* | |
714 | * Handle an open charLpEvent. Could be either interrupt or ack | |
715 | */ | |
716 | static void vioHandleOpenEvent(struct HvLpEvent *event) | |
717 | { | |
718 | unsigned long flags; | |
719 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
720 | u8 port = cevent->virtual_device; | |
721 | struct port_info *pi; | |
722 | int reject = 0; | |
723 | ||
677f8c0d | 724 | if (hvlpevent_is_ack(event)) { |
1da177e4 LT |
725 | if (port >= VTTY_PORTS) |
726 | return; | |
727 | ||
728 | spin_lock_irqsave(&consolelock, flags); | |
729 | /* Got the lock, don't cause console output */ | |
730 | ||
731 | pi = &port_info[port]; | |
732 | if (event->xRc == HvLpEvent_Rc_Good) { | |
733 | pi->seq = pi->ack = 0; | |
734 | /* | |
735 | * This line allows connections from the primary | |
736 | * partition but once one is connected from the | |
737 | * primary partition nothing short of a reboot | |
738 | * of linux will allow access from the hosting | |
739 | * partition again without a required iSeries fix. | |
740 | */ | |
741 | pi->lp = event->xTargetLp; | |
742 | } | |
743 | ||
744 | spin_unlock_irqrestore(&consolelock, flags); | |
745 | if (event->xRc != HvLpEvent_Rc_Good) | |
746 | printk(VIOCONS_KERN_WARN | |
747 | "handle_open_event: event->xRc == (%d).\n", | |
748 | event->xRc); | |
749 | ||
750 | if (event->xCorrelationToken != 0) { | |
751 | atomic_t *aptr= (atomic_t *)event->xCorrelationToken; | |
752 | atomic_set(aptr, 1); | |
753 | } else | |
754 | printk(VIOCONS_KERN_WARN | |
755 | "weird...got open ack without atomic\n"); | |
756 | return; | |
757 | } | |
758 | ||
759 | /* This had better require an ack, otherwise complain */ | |
677f8c0d | 760 | if (!hvlpevent_need_ack(event)) { |
1da177e4 LT |
761 | printk(VIOCONS_KERN_WARN "viocharopen without ack bit!\n"); |
762 | return; | |
763 | } | |
764 | ||
765 | spin_lock_irqsave(&consolelock, flags); | |
766 | /* Got the lock, don't cause console output */ | |
767 | ||
768 | /* Make sure this is a good virtual tty */ | |
769 | if (port >= VTTY_PORTS) { | |
770 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
771 | cevent->subtype_result_code = viorc_openRejected; | |
772 | /* | |
773 | * Flag state here since we can't printk while holding | |
774 | * a spinlock. | |
775 | */ | |
776 | reject = 1; | |
777 | } else { | |
778 | pi = &port_info[port]; | |
779 | if ((pi->lp != HvLpIndexInvalid) && | |
780 | (pi->lp != event->xSourceLp)) { | |
781 | /* | |
782 | * If this is tty is already connected to a different | |
783 | * partition, fail. | |
784 | */ | |
785 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
786 | cevent->subtype_result_code = viorc_openRejected; | |
787 | reject = 2; | |
788 | } else { | |
789 | pi->lp = event->xSourceLp; | |
790 | event->xRc = HvLpEvent_Rc_Good; | |
791 | cevent->subtype_result_code = viorc_good; | |
792 | pi->seq = pi->ack = 0; | |
793 | reject = 0; | |
794 | } | |
795 | } | |
796 | ||
797 | spin_unlock_irqrestore(&consolelock, flags); | |
798 | ||
799 | if (reject == 1) | |
800 | printk(VIOCONS_KERN_WARN "open rejected: bad virtual tty.\n"); | |
801 | else if (reject == 2) | |
802 | printk(VIOCONS_KERN_WARN | |
803 | "open rejected: console in exclusive use by another partition.\n"); | |
804 | ||
805 | /* Return the acknowledgement */ | |
806 | HvCallEvent_ackLpEvent(event); | |
807 | } | |
808 | ||
809 | /* | |
810 | * Handle a close charLpEvent. This should ONLY be an Interrupt because the | |
811 | * virtual console should never actually issue a close event to the hypervisor | |
812 | * because the virtual console never goes away. A close event coming from the | |
813 | * hypervisor simply means that there are no client consoles connected to the | |
814 | * virtual console. | |
815 | * | |
816 | * Regardless of the number of connections masqueraded on the other side of | |
817 | * the hypervisor ONLY ONE close event should be called to accompany the ONE | |
818 | * open event that is called. The close event should ONLY be called when NO | |
819 | * MORE connections (masqueraded or not) exist on the other side of the | |
820 | * hypervisor. | |
821 | */ | |
822 | static void vioHandleCloseEvent(struct HvLpEvent *event) | |
823 | { | |
824 | unsigned long flags; | |
825 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
826 | u8 port = cevent->virtual_device; | |
827 | ||
677f8c0d | 828 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
829 | if (port >= VTTY_PORTS) { |
830 | printk(VIOCONS_KERN_WARN | |
831 | "close message from invalid virtual device.\n"); | |
832 | return; | |
833 | } | |
834 | ||
835 | /* For closes, just mark the console partition invalid */ | |
836 | spin_lock_irqsave(&consolelock, flags); | |
837 | /* Got the lock, don't cause console output */ | |
838 | ||
839 | if (port_info[port].lp == event->xSourceLp) | |
840 | port_info[port].lp = HvLpIndexInvalid; | |
841 | ||
842 | spin_unlock_irqrestore(&consolelock, flags); | |
843 | printk(VIOCONS_KERN_INFO "close from %d\n", event->xSourceLp); | |
844 | } else | |
845 | printk(VIOCONS_KERN_WARN | |
846 | "got unexpected close acknowlegement\n"); | |
847 | } | |
848 | ||
849 | /* | |
850 | * Handle a config charLpEvent. Could be either interrupt or ack | |
851 | */ | |
852 | static void vioHandleConfig(struct HvLpEvent *event) | |
853 | { | |
854 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
855 | ||
856 | HvCall_writeLogBuffer(cevent->data, cevent->len); | |
857 | ||
858 | if (cevent->data[0] == 0x01) | |
859 | printk(VIOCONS_KERN_INFO "window resized to %d: %d: %d: %d\n", | |
860 | cevent->data[1], cevent->data[2], | |
861 | cevent->data[3], cevent->data[4]); | |
862 | else | |
863 | printk(VIOCONS_KERN_WARN "unknown config event\n"); | |
864 | } | |
865 | ||
866 | /* | |
867 | * Handle a data charLpEvent. | |
868 | */ | |
869 | static void vioHandleData(struct HvLpEvent *event) | |
870 | { | |
871 | struct tty_struct *tty; | |
872 | unsigned long flags; | |
873 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
874 | struct port_info *pi; | |
875 | int index; | |
415c2e08 | 876 | int num_pushed; |
1da177e4 LT |
877 | u8 port = cevent->virtual_device; |
878 | ||
879 | if (port >= VTTY_PORTS) { | |
880 | printk(VIOCONS_KERN_WARN "data on invalid virtual device %d\n", | |
881 | port); | |
882 | return; | |
883 | } | |
884 | ||
885 | /* | |
886 | * Hold the spinlock so that we don't take an interrupt that | |
887 | * changes tty between the time we fetch the port_info | |
888 | * pointer and the time we paranoia check. | |
889 | */ | |
890 | spin_lock_irqsave(&consolelock, flags); | |
891 | pi = &port_info[port]; | |
892 | ||
893 | /* | |
894 | * Change 05/01/2003 - Ryan Arnold: If a partition other than | |
895 | * the current exclusive partition tries to send us data | |
896 | * events then just drop them on the floor because we don't | |
897 | * want his stinking data. He isn't authorized to receive | |
898 | * data because he wasn't the first one to get the console, | |
899 | * therefore he shouldn't be allowed to send data either. | |
900 | * This will work without an iSeries fix. | |
901 | */ | |
902 | if (pi->lp != event->xSourceLp) { | |
903 | spin_unlock_irqrestore(&consolelock, flags); | |
904 | return; | |
905 | } | |
906 | ||
907 | tty = pi->tty; | |
908 | if (tty == NULL) { | |
909 | spin_unlock_irqrestore(&consolelock, flags); | |
910 | printk(VIOCONS_KERN_WARN "no tty for virtual device %d\n", | |
911 | port); | |
912 | return; | |
913 | } | |
914 | ||
915 | if (tty->magic != TTY_MAGIC) { | |
916 | spin_unlock_irqrestore(&consolelock, flags); | |
917 | printk(VIOCONS_KERN_WARN "tty bad magic\n"); | |
918 | return; | |
919 | } | |
920 | ||
921 | /* | |
922 | * Just to be paranoid, make sure the tty points back to this port | |
923 | */ | |
924 | pi = (struct port_info *)tty->driver_data; | |
925 | if (!pi || viotty_paranoia_check(pi, tty->name, "vioHandleData")) { | |
926 | spin_unlock_irqrestore(&consolelock, flags); | |
927 | return; | |
928 | } | |
929 | spin_unlock_irqrestore(&consolelock, flags); | |
930 | ||
931 | /* | |
932 | * Change 07/21/2003 - Ryan Arnold: functionality added to | |
933 | * support sysrq utilizing ^O as the sysrq key. The sysrq | |
934 | * functionality will only work if built into the kernel and | |
935 | * then only if sysrq is enabled through the proc filesystem. | |
936 | */ | |
415c2e08 | 937 | num_pushed = 0; |
1da177e4 LT |
938 | for (index = 0; index < cevent->len; index++) { |
939 | #ifdef CONFIG_MAGIC_SYSRQ | |
940 | if (sysrq_enabled) { | |
941 | /* 0x0f is the ascii character for ^O */ | |
942 | if (cevent->data[index] == '\x0f') { | |
943 | vio_sysrq_pressed = 1; | |
944 | /* | |
945 | * continue because we don't want to add | |
946 | * the sysrq key into the data string. | |
947 | */ | |
948 | continue; | |
949 | } else if (vio_sysrq_pressed) { | |
950 | handle_sysrq(cevent->data[index], NULL, tty); | |
951 | vio_sysrq_pressed = 0; | |
952 | /* | |
953 | * continue because we don't want to add | |
954 | * the sysrq sequence into the data string. | |
955 | */ | |
956 | continue; | |
957 | } | |
958 | } | |
959 | #endif | |
960 | /* | |
961 | * The sysrq sequence isn't included in this check if | |
962 | * sysrq is enabled and compiled into the kernel because | |
963 | * the sequence will never get inserted into the buffer. | |
964 | * Don't attempt to copy more data into the buffer than we | |
965 | * have room for because it would fail without indication. | |
966 | */ | |
33f0f88f | 967 | if(tty_insert_flip_char(tty, cevent->data[index], TTY_NORMAL) == 0) { |
1da177e4 LT |
968 | printk(VIOCONS_KERN_WARN "input buffer overflow!\n"); |
969 | break; | |
970 | } | |
415c2e08 | 971 | num_pushed++; |
1da177e4 LT |
972 | } |
973 | ||
415c2e08 | 974 | if (num_pushed) |
1da177e4 LT |
975 | tty_flip_buffer_push(tty); |
976 | } | |
977 | ||
978 | /* | |
979 | * Handle an ack charLpEvent. | |
980 | */ | |
981 | static void vioHandleAck(struct HvLpEvent *event) | |
982 | { | |
983 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
984 | unsigned long flags; | |
985 | u8 port = cevent->virtual_device; | |
986 | ||
987 | if (port >= VTTY_PORTS) { | |
988 | printk(VIOCONS_KERN_WARN "data on invalid virtual device\n"); | |
989 | return; | |
990 | } | |
991 | ||
992 | spin_lock_irqsave(&consolelock, flags); | |
993 | port_info[port].ack = event->xCorrelationToken; | |
994 | spin_unlock_irqrestore(&consolelock, flags); | |
995 | ||
996 | if (port_info[port].used) | |
997 | send_buffers(&port_info[port]); | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * Handle charLpEvents and route to the appropriate routine | |
1002 | */ | |
1003 | static void vioHandleCharEvent(struct HvLpEvent *event) | |
1004 | { | |
1005 | int charminor; | |
1006 | ||
1007 | if (event == NULL) | |
1008 | return; | |
1009 | ||
1010 | charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK; | |
1011 | switch (charminor) { | |
1012 | case viocharopen: | |
1013 | vioHandleOpenEvent(event); | |
1014 | break; | |
1015 | case viocharclose: | |
1016 | vioHandleCloseEvent(event); | |
1017 | break; | |
1018 | case viochardata: | |
1019 | vioHandleData(event); | |
1020 | break; | |
1021 | case viocharack: | |
1022 | vioHandleAck(event); | |
1023 | break; | |
1024 | case viocharconfig: | |
1025 | vioHandleConfig(event); | |
1026 | break; | |
1027 | default: | |
677f8c0d | 1028 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { |
1da177e4 LT |
1029 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
1030 | HvCallEvent_ackLpEvent(event); | |
1031 | } | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * Send an open event | |
1037 | */ | |
1038 | static int send_open(HvLpIndex remoteLp, void *sem) | |
1039 | { | |
1040 | return HvCallEvent_signalLpEventFast(remoteLp, | |
1041 | HvLpEvent_Type_VirtualIo, | |
1042 | viomajorsubtype_chario | viocharopen, | |
1043 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
1044 | viopath_sourceinst(remoteLp), | |
1045 | viopath_targetinst(remoteLp), | |
1046 | (u64)(unsigned long)sem, VIOVERSION << 16, | |
1047 | 0, 0, 0, 0); | |
1048 | } | |
1049 | ||
1050 | static struct tty_operations serial_ops = { | |
1051 | .open = viotty_open, | |
1052 | .close = viotty_close, | |
1053 | .write = viotty_write, | |
1054 | .put_char = viotty_put_char, | |
1055 | .write_room = viotty_write_room, | |
1056 | .chars_in_buffer = viotty_chars_in_buffer, | |
1057 | .ioctl = viotty_ioctl, | |
1058 | }; | |
1059 | ||
1060 | static int __init viocons_init2(void) | |
1061 | { | |
1062 | atomic_t wait_flag; | |
1063 | int rc; | |
1064 | ||
1065 | /* +2 for fudge */ | |
1066 | rc = viopath_open(HvLpConfig_getPrimaryLpIndex(), | |
1067 | viomajorsubtype_chario, VIOCHAR_WINDOW + 2); | |
1068 | if (rc) | |
1069 | printk(VIOCONS_KERN_WARN "error opening to primary %d\n", rc); | |
1070 | ||
1071 | if (viopath_hostLp == HvLpIndexInvalid) | |
1072 | vio_set_hostlp(); | |
1073 | ||
1074 | /* | |
1075 | * And if the primary is not the same as the hosting LP, open to the | |
1076 | * hosting lp | |
1077 | */ | |
1078 | if ((viopath_hostLp != HvLpIndexInvalid) && | |
1079 | (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) { | |
1080 | printk(VIOCONS_KERN_INFO "open path to hosting (%d)\n", | |
1081 | viopath_hostLp); | |
1082 | rc = viopath_open(viopath_hostLp, viomajorsubtype_chario, | |
1083 | VIOCHAR_WINDOW + 2); /* +2 for fudge */ | |
1084 | if (rc) | |
1085 | printk(VIOCONS_KERN_WARN | |
1086 | "error opening to partition %d: %d\n", | |
1087 | viopath_hostLp, rc); | |
1088 | } | |
1089 | ||
1090 | if (vio_setHandler(viomajorsubtype_chario, vioHandleCharEvent) < 0) | |
1091 | printk(VIOCONS_KERN_WARN | |
1092 | "error seting handler for console events!\n"); | |
1093 | ||
1094 | /* | |
1095 | * First, try to open the console to the hosting lp. | |
1096 | * Wait on a semaphore for the response. | |
1097 | */ | |
1098 | atomic_set(&wait_flag, 0); | |
1099 | if ((viopath_isactive(viopath_hostLp)) && | |
1100 | (send_open(viopath_hostLp, (void *)&wait_flag) == 0)) { | |
1101 | printk(VIOCONS_KERN_INFO "hosting partition %d\n", | |
1102 | viopath_hostLp); | |
1103 | while (atomic_read(&wait_flag) == 0) | |
1104 | mb(); | |
1105 | atomic_set(&wait_flag, 0); | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * If we don't have an active console, try the primary | |
1110 | */ | |
1111 | if ((!viopath_isactive(port_info[0].lp)) && | |
1112 | (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) && | |
1113 | (send_open(HvLpConfig_getPrimaryLpIndex(), (void *)&wait_flag) | |
1114 | == 0)) { | |
1115 | printk(VIOCONS_KERN_INFO "opening console to primary partition\n"); | |
1116 | while (atomic_read(&wait_flag) == 0) | |
1117 | mb(); | |
1118 | } | |
1119 | ||
1120 | /* Initialize the tty_driver structure */ | |
1121 | viotty_driver = alloc_tty_driver(VTTY_PORTS); | |
1122 | viotty_driver->owner = THIS_MODULE; | |
1123 | viotty_driver->driver_name = "vioconsole"; | |
1da177e4 LT |
1124 | viotty_driver->name = "tty"; |
1125 | viotty_driver->name_base = 1; | |
1126 | viotty_driver->major = TTY_MAJOR; | |
1127 | viotty_driver->minor_start = 1; | |
1128 | viotty_driver->type = TTY_DRIVER_TYPE_CONSOLE; | |
1129 | viotty_driver->subtype = 1; | |
1130 | viotty_driver->init_termios = tty_std_termios; | |
1131 | viotty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; | |
1132 | tty_set_operations(viotty_driver, &serial_ops); | |
1133 | ||
1134 | if (tty_register_driver(viotty_driver)) { | |
1135 | printk(VIOCONS_KERN_WARN "couldn't register console driver\n"); | |
1136 | put_tty_driver(viotty_driver); | |
1137 | viotty_driver = NULL; | |
1138 | } | |
1139 | ||
1140 | unregister_console(&viocons_early); | |
1141 | register_console(&viocons); | |
1142 | ||
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | static int __init viocons_init(void) | |
1147 | { | |
1148 | int i; | |
1149 | ||
1150 | printk(VIOCONS_KERN_INFO "registering console\n"); | |
1151 | for (i = 0; i < VTTY_PORTS; i++) { | |
1152 | port_info[i].lp = HvLpIndexInvalid; | |
1153 | port_info[i].magic = VIOTTY_MAGIC; | |
1154 | } | |
1155 | HvCall_setLogBufferFormatAndCodepage(HvCall_LogBuffer_ASCII, 437); | |
8bff05b0 | 1156 | add_preferred_console("viocons", 0, NULL); |
1da177e4 LT |
1157 | register_console(&viocons_early); |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | console_initcall(viocons_init); | |
1162 | module_init(viocons_init2); |