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7355ba34 PH |
1 | /* |
2 | * FireWire Serial driver | |
3 | * | |
4 | * Copyright (C) 2012 Peter Hurley <peter@hurleysoftware.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/mod_devicetable.h> | |
25 | #include <linux/rculist.h> | |
26 | #include <linux/workqueue.h> | |
27 | #include <linux/ratelimit.h> | |
28 | #include <linux/bug.h> | |
29 | #include <linux/uaccess.h> | |
30 | ||
31 | #include "fwserial.h" | |
32 | ||
33 | #define be32_to_u64(hi, lo) ((u64)be32_to_cpu(hi) << 32 | be32_to_cpu(lo)) | |
34 | ||
35 | #define LINUX_VENDOR_ID 0xd00d1eU /* same id used in card root directory */ | |
36 | #define FWSERIAL_VERSION 0x00e81cU /* must be unique within LINUX_VENDOR_ID */ | |
37 | ||
38 | /* configurable options */ | |
39 | static int num_ttys = 4; /* # of std ttys to create per fw_card */ | |
40 | /* - doubles as loopback port index */ | |
41 | static bool auto_connect = true; /* try to VIRT_CABLE to every peer */ | |
42 | static bool create_loop_dev = true; /* create a loopback device for each card */ | |
43 | bool limit_bw; /* limit async bandwidth to 20% of max */ | |
44 | ||
45 | module_param_named(ttys, num_ttys, int, S_IRUGO | S_IWUSR); | |
46 | module_param_named(auto, auto_connect, bool, S_IRUGO | S_IWUSR); | |
47 | module_param_named(loop, create_loop_dev, bool, S_IRUGO | S_IWUSR); | |
48 | module_param(limit_bw, bool, S_IRUGO | S_IWUSR); | |
49 | ||
50 | /* | |
51 | * Threshold below which the tty is woken for writing | |
52 | * - should be equal to WAKEUP_CHARS in drivers/tty/n_tty.c because | |
53 | * even if the writer is woken, n_tty_poll() won't set POLLOUT until | |
54 | * our fifo is below this level | |
55 | */ | |
56 | #define WAKEUP_CHARS 256 | |
57 | ||
58 | /** | |
59 | * fwserial_list: list of every fw_serial created for each fw_card | |
60 | * See discussion in fwserial_probe. | |
61 | */ | |
62 | static LIST_HEAD(fwserial_list); | |
63 | static DEFINE_MUTEX(fwserial_list_mutex); | |
64 | ||
65 | /** | |
66 | * port_table: array of tty ports allocated to each fw_card | |
67 | * | |
68 | * tty ports are allocated during probe when an fw_serial is first | |
69 | * created for a given fw_card. Ports are allocated in a contiguous block, | |
70 | * each block consisting of 'num_ports' ports. | |
71 | */ | |
72 | static struct fwtty_port *port_table[MAX_TOTAL_PORTS]; | |
73 | static DEFINE_MUTEX(port_table_lock); | |
74 | static bool port_table_corrupt; | |
75 | #define FWTTY_INVALID_INDEX MAX_TOTAL_PORTS | |
76 | ||
77 | /* total # of tty ports created per fw_card */ | |
78 | static int num_ports; | |
79 | ||
80 | /* slab used as pool for struct fwtty_transactions */ | |
81 | static struct kmem_cache *fwtty_txn_cache; | |
82 | ||
83 | struct fwtty_transaction; | |
84 | typedef void (*fwtty_transaction_cb)(struct fw_card *card, int rcode, | |
85 | void *data, size_t length, | |
86 | struct fwtty_transaction *txn); | |
87 | ||
88 | struct fwtty_transaction { | |
89 | struct fw_transaction fw_txn; | |
90 | fwtty_transaction_cb callback; | |
91 | struct fwtty_port *port; | |
92 | union { | |
93 | struct dma_pending dma_pended; | |
94 | }; | |
95 | }; | |
96 | ||
97 | #define to_device(a, b) (a->b) | |
98 | #define fwtty_err(p, s, v...) dev_err(to_device(p, device), s, ##v) | |
99 | #define fwtty_info(p, s, v...) dev_info(to_device(p, device), s, ##v) | |
100 | #define fwtty_notice(p, s, v...) dev_notice(to_device(p, device), s, ##v) | |
101 | #define fwtty_dbg(p, s, v...) \ | |
102 | dev_dbg(to_device(p, device), "%s: " s, __func__, ##v) | |
103 | #define fwtty_err_ratelimited(p, s, v...) \ | |
104 | dev_err_ratelimited(to_device(p, device), s, ##v) | |
105 | ||
106 | #ifdef DEBUG | |
107 | static inline void debug_short_write(struct fwtty_port *port, int c, int n) | |
108 | { | |
109 | int avail; | |
110 | ||
111 | if (n < c) { | |
112 | spin_lock_bh(&port->lock); | |
113 | avail = dma_fifo_avail(&port->tx_fifo); | |
114 | spin_unlock_bh(&port->lock); | |
115 | fwtty_dbg(port, "short write: avail:%d req:%d wrote:%d", | |
116 | avail, c, n); | |
117 | } | |
118 | } | |
119 | #else | |
120 | #define debug_short_write(port, c, n) | |
121 | #endif | |
122 | ||
123 | static struct fwtty_peer *__fwserial_peer_by_node_id(struct fw_card *card, | |
124 | int generation, int id); | |
125 | ||
126 | #ifdef FWTTY_PROFILING | |
127 | ||
128 | static void profile_fifo_avail(struct fwtty_port *port, unsigned *stat) | |
129 | { | |
130 | spin_lock_bh(&port->lock); | |
131 | profile_size_distrib(stat, dma_fifo_avail(&port->tx_fifo)); | |
132 | spin_unlock_bh(&port->lock); | |
133 | } | |
134 | ||
135 | static void dump_profile(struct seq_file *m, struct stats *stats) | |
136 | { | |
137 | /* for each stat, print sum of 0 to 2^k, then individually */ | |
138 | int k = 4; | |
139 | unsigned sum; | |
140 | int j; | |
141 | char t[10]; | |
142 | ||
143 | snprintf(t, 10, "< %d", 1 << k); | |
144 | seq_printf(m, "\n%14s %6s", " ", t); | |
145 | for (j = k + 1; j < DISTRIBUTION_MAX_INDEX; ++j) | |
146 | seq_printf(m, "%6d", 1 << j); | |
147 | ||
148 | ++k; | |
149 | for (j = 0, sum = 0; j <= k; ++j) | |
150 | sum += stats->reads[j]; | |
151 | seq_printf(m, "\n%14s: %6d", "reads", sum); | |
152 | for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j) | |
153 | seq_printf(m, "%6d", stats->reads[j]); | |
154 | ||
155 | for (j = 0, sum = 0; j <= k; ++j) | |
156 | sum += stats->writes[j]; | |
157 | seq_printf(m, "\n%14s: %6d", "writes", sum); | |
158 | for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j) | |
159 | seq_printf(m, "%6d", stats->writes[j]); | |
160 | ||
161 | for (j = 0, sum = 0; j <= k; ++j) | |
162 | sum += stats->txns[j]; | |
163 | seq_printf(m, "\n%14s: %6d", "txns", sum); | |
164 | for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j) | |
165 | seq_printf(m, "%6d", stats->txns[j]); | |
166 | ||
167 | for (j = 0, sum = 0; j <= k; ++j) | |
168 | sum += stats->unthrottle[j]; | |
169 | seq_printf(m, "\n%14s: %6d", "avail @ unthr", sum); | |
170 | for (j = k + 1; j <= DISTRIBUTION_MAX_INDEX; ++j) | |
171 | seq_printf(m, "%6d", stats->unthrottle[j]); | |
172 | } | |
173 | ||
174 | #else | |
175 | #define profile_fifo_avail(port, stat) | |
176 | #define dump_profile(m, stats) | |
177 | #endif | |
178 | ||
179 | /* Returns the max receive packet size for the given card */ | |
180 | static inline int device_max_receive(struct fw_device *fw_device) | |
181 | { | |
182 | return 1 << (clamp_t(int, fw_device->max_rec, 8U, 13U) + 1); | |
183 | } | |
184 | ||
185 | static void fwtty_log_tx_error(struct fwtty_port *port, int rcode) | |
186 | { | |
187 | switch (rcode) { | |
188 | case RCODE_SEND_ERROR: | |
189 | fwtty_err_ratelimited(port, "card busy"); | |
190 | break; | |
191 | case RCODE_ADDRESS_ERROR: | |
192 | fwtty_err_ratelimited(port, "bad unit addr or write length"); | |
193 | break; | |
194 | case RCODE_DATA_ERROR: | |
195 | fwtty_err_ratelimited(port, "failed rx"); | |
196 | break; | |
197 | case RCODE_NO_ACK: | |
198 | fwtty_err_ratelimited(port, "missing ack"); | |
199 | break; | |
200 | case RCODE_BUSY: | |
201 | fwtty_err_ratelimited(port, "remote busy"); | |
202 | break; | |
203 | default: | |
204 | fwtty_err_ratelimited(port, "failed tx: %d", rcode); | |
205 | } | |
206 | } | |
207 | ||
208 | static void fwtty_txn_constructor(void *this) | |
209 | { | |
210 | struct fwtty_transaction *txn = this; | |
211 | ||
212 | init_timer(&txn->fw_txn.split_timeout_timer); | |
213 | } | |
214 | ||
215 | static void fwtty_common_callback(struct fw_card *card, int rcode, | |
216 | void *payload, size_t len, void *cb_data) | |
217 | { | |
218 | struct fwtty_transaction *txn = cb_data; | |
219 | struct fwtty_port *port = txn->port; | |
220 | ||
221 | if (port && rcode != RCODE_COMPLETE) | |
222 | fwtty_log_tx_error(port, rcode); | |
223 | if (txn->callback) | |
224 | txn->callback(card, rcode, payload, len, txn); | |
225 | kmem_cache_free(fwtty_txn_cache, txn); | |
226 | } | |
227 | ||
228 | static int fwtty_send_data_async(struct fwtty_peer *peer, int tcode, | |
229 | unsigned long long addr, void *payload, | |
230 | size_t len, fwtty_transaction_cb callback, | |
231 | struct fwtty_port *port) | |
232 | { | |
233 | struct fwtty_transaction *txn; | |
234 | int generation; | |
235 | ||
236 | txn = kmem_cache_alloc(fwtty_txn_cache, GFP_ATOMIC); | |
237 | if (!txn) | |
238 | return -ENOMEM; | |
239 | ||
240 | txn->callback = callback; | |
241 | txn->port = port; | |
242 | ||
243 | generation = peer->generation; | |
244 | smp_rmb(); | |
245 | fw_send_request(peer->serial->card, &txn->fw_txn, tcode, | |
246 | peer->node_id, generation, peer->speed, addr, payload, | |
247 | len, fwtty_common_callback, txn); | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static void fwtty_send_txn_async(struct fwtty_peer *peer, | |
252 | struct fwtty_transaction *txn, int tcode, | |
253 | unsigned long long addr, void *payload, | |
254 | size_t len, fwtty_transaction_cb callback, | |
255 | struct fwtty_port *port) | |
256 | { | |
257 | int generation; | |
258 | ||
259 | txn->callback = callback; | |
260 | txn->port = port; | |
261 | ||
262 | generation = peer->generation; | |
263 | smp_rmb(); | |
264 | fw_send_request(peer->serial->card, &txn->fw_txn, tcode, | |
265 | peer->node_id, generation, peer->speed, addr, payload, | |
266 | len, fwtty_common_callback, txn); | |
267 | } | |
268 | ||
269 | ||
270 | static void __fwtty_restart_tx(struct fwtty_port *port) | |
271 | { | |
272 | int len, avail; | |
273 | ||
274 | len = dma_fifo_out_level(&port->tx_fifo); | |
275 | if (len) | |
276 | schedule_delayed_work(&port->drain, 0); | |
277 | avail = dma_fifo_avail(&port->tx_fifo); | |
278 | ||
279 | fwtty_dbg(port, "fifo len: %d avail: %d", len, avail); | |
280 | } | |
281 | ||
282 | static void fwtty_restart_tx(struct fwtty_port *port) | |
283 | { | |
284 | spin_lock_bh(&port->lock); | |
285 | __fwtty_restart_tx(port); | |
286 | spin_unlock_bh(&port->lock); | |
287 | } | |
288 | ||
289 | /** | |
290 | * fwtty_update_port_status - decodes & dispatches line status changes | |
291 | * | |
292 | * Note: in loopback, the port->lock is being held. Only use functions that | |
293 | * don't attempt to reclaim the port->lock. | |
294 | */ | |
295 | static void fwtty_update_port_status(struct fwtty_port *port, unsigned status) | |
296 | { | |
297 | unsigned delta; | |
298 | struct tty_struct *tty; | |
299 | ||
300 | /* simulated LSR/MSR status from remote */ | |
301 | status &= ~MCTRL_MASK; | |
302 | delta = (port->mstatus ^ status) & ~MCTRL_MASK; | |
303 | delta &= ~(status & TIOCM_RNG); | |
304 | port->mstatus = status; | |
305 | ||
306 | if (delta & TIOCM_RNG) | |
307 | ++port->icount.rng; | |
308 | if (delta & TIOCM_DSR) | |
309 | ++port->icount.dsr; | |
310 | if (delta & TIOCM_CAR) | |
311 | ++port->icount.dcd; | |
312 | if (delta & TIOCM_CTS) | |
313 | ++port->icount.cts; | |
314 | ||
315 | fwtty_dbg(port, "status: %x delta: %x", status, delta); | |
316 | ||
317 | if (delta & TIOCM_CAR) { | |
318 | tty = tty_port_tty_get(&port->port); | |
319 | if (tty && !C_CLOCAL(tty)) { | |
320 | if (status & TIOCM_CAR) | |
321 | wake_up_interruptible(&port->port.open_wait); | |
322 | else | |
323 | schedule_work(&port->hangup); | |
324 | } | |
325 | tty_kref_put(tty); | |
326 | } | |
327 | ||
328 | if (delta & TIOCM_CTS) { | |
329 | tty = tty_port_tty_get(&port->port); | |
330 | if (tty && C_CRTSCTS(tty)) { | |
331 | if (tty->hw_stopped) { | |
332 | if (status & TIOCM_CTS) { | |
333 | tty->hw_stopped = 0; | |
334 | if (port->loopback) | |
335 | __fwtty_restart_tx(port); | |
336 | else | |
337 | fwtty_restart_tx(port); | |
338 | } | |
339 | } else { | |
340 | if (~status & TIOCM_CTS) | |
341 | tty->hw_stopped = 1; | |
342 | } | |
343 | } | |
344 | tty_kref_put(tty); | |
345 | ||
346 | } else if (delta & OOB_TX_THROTTLE) { | |
347 | tty = tty_port_tty_get(&port->port); | |
348 | if (tty) { | |
349 | if (tty->hw_stopped) { | |
350 | if (~status & OOB_TX_THROTTLE) { | |
351 | tty->hw_stopped = 0; | |
352 | if (port->loopback) | |
353 | __fwtty_restart_tx(port); | |
354 | else | |
355 | fwtty_restart_tx(port); | |
356 | } | |
357 | } else { | |
358 | if (status & OOB_TX_THROTTLE) | |
359 | tty->hw_stopped = 1; | |
360 | } | |
361 | } | |
362 | tty_kref_put(tty); | |
363 | } | |
364 | ||
365 | if (delta & (UART_LSR_BI << 24)) { | |
366 | if (status & (UART_LSR_BI << 24)) { | |
367 | port->break_last = jiffies; | |
368 | schedule_delayed_work(&port->emit_breaks, 0); | |
369 | } else { | |
370 | /* run emit_breaks one last time (if pending) */ | |
371 | mod_delayed_work(system_wq, &port->emit_breaks, 0); | |
372 | } | |
373 | } | |
374 | ||
375 | if (delta & (TIOCM_DSR | TIOCM_CAR | TIOCM_CTS | TIOCM_RNG)) | |
376 | wake_up_interruptible(&port->port.delta_msr_wait); | |
377 | } | |
378 | ||
379 | /** | |
380 | * __fwtty_port_line_status - generate 'line status' for indicated port | |
381 | * | |
382 | * This function returns a remote 'MSR' state based on the local 'MCR' state, | |
383 | * as if a null modem cable was attached. The actual status is a mangling | |
384 | * of TIOCM_* bits suitable for sending to a peer's status_addr. | |
385 | * | |
386 | * Note: caller must be holding port lock | |
387 | */ | |
388 | static unsigned __fwtty_port_line_status(struct fwtty_port *port) | |
389 | { | |
390 | unsigned status = 0; | |
391 | ||
392 | /* TODO: add module param to tie RNG to DTR as well */ | |
393 | ||
394 | if (port->mctrl & TIOCM_DTR) | |
395 | status |= TIOCM_DSR | TIOCM_CAR; | |
396 | if (port->mctrl & TIOCM_RTS) | |
397 | status |= TIOCM_CTS; | |
398 | if (port->mctrl & OOB_RX_THROTTLE) | |
399 | status |= OOB_TX_THROTTLE; | |
400 | /* emulate BRK as add'l line status */ | |
401 | if (port->break_ctl) | |
402 | status |= UART_LSR_BI << 24; | |
403 | ||
404 | return status; | |
405 | } | |
406 | ||
407 | /** | |
408 | * __fwtty_write_port_status - send the port line status to peer | |
409 | * | |
410 | * Note: caller must be holding the port lock. | |
411 | */ | |
412 | static int __fwtty_write_port_status(struct fwtty_port *port) | |
413 | { | |
414 | struct fwtty_peer *peer; | |
415 | int err = -ENOENT; | |
416 | unsigned status = __fwtty_port_line_status(port); | |
417 | ||
418 | rcu_read_lock(); | |
419 | peer = rcu_dereference(port->peer); | |
420 | if (peer) { | |
421 | err = fwtty_send_data_async(peer, TCODE_WRITE_QUADLET_REQUEST, | |
422 | peer->status_addr, &status, | |
423 | sizeof(status), NULL, port); | |
424 | } | |
425 | rcu_read_unlock(); | |
426 | ||
427 | return err; | |
428 | } | |
429 | ||
430 | /** | |
431 | * fwtty_write_port_status - same as above but locked by port lock | |
432 | */ | |
433 | static int fwtty_write_port_status(struct fwtty_port *port) | |
434 | { | |
435 | int err; | |
436 | ||
437 | spin_lock_bh(&port->lock); | |
438 | err = __fwtty_write_port_status(port); | |
439 | spin_unlock_bh(&port->lock); | |
440 | return err; | |
441 | } | |
442 | ||
443 | static void __fwtty_throttle(struct fwtty_port *port, struct tty_struct *tty) | |
444 | { | |
445 | unsigned old; | |
446 | ||
447 | old = port->mctrl; | |
448 | port->mctrl |= OOB_RX_THROTTLE; | |
449 | if (C_CRTSCTS(tty)) | |
450 | port->mctrl &= ~TIOCM_RTS; | |
451 | if (~old & OOB_RX_THROTTLE) | |
452 | __fwtty_write_port_status(port); | |
453 | } | |
454 | ||
455 | /** | |
456 | * fwtty_do_hangup - wait for ldisc to deliver all pending rx; only then hangup | |
457 | * | |
458 | * When the remote has finished tx, and all in-flight rx has been received and | |
459 | * and pushed to the flip buffer, the remote may close its device. This will | |
460 | * drop DTR on the remote which will drop carrier here. Typically, the tty is | |
461 | * hung up when carrier is dropped or lost. | |
462 | * | |
463 | * However, there is a race between the hang up and the line discipline | |
464 | * delivering its data to the reader. A hangup will cause the ldisc to flush | |
465 | * (ie., clear) the read buffer and flip buffer. Because of firewire's | |
466 | * relatively high throughput, the ldisc frequently lags well behind the driver, | |
467 | * resulting in lost data (which has already been received and written to | |
468 | * the flip buffer) when the remote closes its end. | |
469 | * | |
470 | * Unfortunately, since the flip buffer offers no direct method for determining | |
471 | * if it holds data, ensuring the ldisc has delivered all data is problematic. | |
472 | */ | |
473 | ||
474 | /* FIXME: drop this workaround when __tty_hangup waits for ldisc completion */ | |
475 | static void fwtty_do_hangup(struct work_struct *work) | |
476 | { | |
477 | struct fwtty_port *port = to_port(work, hangup); | |
478 | struct tty_struct *tty; | |
479 | ||
480 | schedule_timeout_uninterruptible(msecs_to_jiffies(50)); | |
481 | ||
482 | tty = tty_port_tty_get(&port->port); | |
483 | if (tty) | |
484 | tty_vhangup(tty); | |
485 | tty_kref_put(tty); | |
486 | } | |
487 | ||
488 | ||
489 | static void fwtty_emit_breaks(struct work_struct *work) | |
490 | { | |
491 | struct fwtty_port *port = to_port(to_delayed_work(work), emit_breaks); | |
492 | struct tty_struct *tty; | |
493 | static const char buf[16]; | |
494 | unsigned long now = jiffies; | |
495 | unsigned long elapsed = now - port->break_last; | |
496 | int n, t, c, brk = 0; | |
497 | ||
498 | tty = tty_port_tty_get(&port->port); | |
499 | if (!tty) | |
500 | return; | |
501 | ||
502 | /* generate breaks at the line rate (but at least 1) */ | |
503 | n = (elapsed * port->cps) / HZ + 1; | |
504 | port->break_last = now; | |
505 | ||
506 | fwtty_dbg(port, "sending %d brks", n); | |
507 | ||
508 | while (n) { | |
509 | t = min(n, 16); | |
510 | c = tty_insert_flip_string_fixed_flag(tty, buf, TTY_BREAK, t); | |
511 | n -= c; | |
512 | brk += c; | |
513 | if (c < t) | |
514 | break; | |
515 | } | |
516 | tty_flip_buffer_push(tty); | |
517 | ||
518 | tty_kref_put(tty); | |
519 | ||
520 | if (port->mstatus & (UART_LSR_BI << 24)) | |
521 | schedule_delayed_work(&port->emit_breaks, FREQ_BREAKS); | |
522 | port->icount.brk += brk; | |
523 | } | |
524 | ||
525 | static void fwtty_pushrx(struct work_struct *work) | |
526 | { | |
527 | struct fwtty_port *port = to_port(work, push); | |
528 | struct tty_struct *tty; | |
529 | struct buffered_rx *buf, *next; | |
530 | int n, c = 0; | |
531 | ||
532 | tty = tty_port_tty_get(&port->port); | |
533 | if (!tty) | |
534 | return; | |
535 | ||
536 | spin_lock_bh(&port->lock); | |
537 | list_for_each_entry_safe(buf, next, &port->buf_list, list) { | |
538 | n = tty_insert_flip_string_fixed_flag(tty, buf->data, | |
539 | TTY_NORMAL, buf->n); | |
540 | c += n; | |
541 | port->buffered -= n; | |
542 | if (n < buf->n) { | |
543 | if (n > 0) { | |
544 | memmove(buf->data, buf->data + n, buf->n - n); | |
545 | buf->n -= n; | |
546 | } | |
547 | __fwtty_throttle(port, tty); | |
548 | break; | |
549 | } else { | |
550 | list_del(&buf->list); | |
551 | kfree(buf); | |
552 | } | |
553 | } | |
554 | if (c > 0) | |
555 | tty_flip_buffer_push(tty); | |
556 | ||
557 | if (list_empty(&port->buf_list)) | |
558 | clear_bit(BUFFERING_RX, &port->flags); | |
559 | spin_unlock_bh(&port->lock); | |
560 | ||
561 | tty_kref_put(tty); | |
562 | } | |
563 | ||
564 | static int fwtty_buffer_rx(struct fwtty_port *port, unsigned char *d, size_t n) | |
565 | { | |
566 | struct buffered_rx *buf; | |
567 | size_t size = (n + sizeof(struct buffered_rx) + 0xFF) & ~0xFF; | |
568 | ||
569 | if (port->buffered + n > HIGH_WATERMARK) | |
570 | return 0; | |
571 | buf = kmalloc(size, GFP_ATOMIC); | |
572 | if (!buf) | |
573 | return 0; | |
574 | INIT_LIST_HEAD(&buf->list); | |
575 | buf->n = n; | |
576 | memcpy(buf->data, d, n); | |
577 | ||
578 | spin_lock_bh(&port->lock); | |
579 | list_add_tail(&buf->list, &port->buf_list); | |
580 | port->buffered += n; | |
581 | if (port->buffered > port->stats.watermark) | |
582 | port->stats.watermark = port->buffered; | |
583 | set_bit(BUFFERING_RX, &port->flags); | |
584 | spin_unlock_bh(&port->lock); | |
585 | ||
586 | return n; | |
587 | } | |
588 | ||
589 | static int fwtty_rx(struct fwtty_port *port, unsigned char *data, size_t len) | |
590 | { | |
591 | struct tty_struct *tty; | |
592 | int c, n = len; | |
593 | unsigned lsr; | |
594 | int err = 0; | |
595 | ||
596 | tty = tty_port_tty_get(&port->port); | |
597 | if (!tty) | |
598 | return -ENOENT; | |
599 | ||
600 | fwtty_dbg(port, "%d", n); | |
601 | profile_size_distrib(port->stats.reads, n); | |
602 | ||
603 | if (port->write_only) { | |
604 | n = 0; | |
605 | goto out; | |
606 | } | |
607 | ||
608 | /* disregard break status; breaks are generated by emit_breaks work */ | |
609 | lsr = (port->mstatus >> 24) & ~UART_LSR_BI; | |
610 | ||
611 | if (port->overrun) | |
612 | lsr |= UART_LSR_OE; | |
613 | ||
614 | if (lsr & UART_LSR_OE) | |
615 | ++port->icount.overrun; | |
616 | ||
617 | lsr &= port->status_mask; | |
618 | if (lsr & ~port->ignore_mask & UART_LSR_OE) { | |
619 | if (!tty_insert_flip_char(tty, 0, TTY_OVERRUN)) { | |
620 | err = -EIO; | |
621 | goto out; | |
622 | } | |
623 | } | |
624 | port->overrun = false; | |
625 | ||
626 | if (lsr & port->ignore_mask & ~UART_LSR_OE) { | |
627 | /* TODO: don't drop SAK and Magic SysRq here */ | |
628 | n = 0; | |
629 | goto out; | |
630 | } | |
631 | ||
632 | if (!test_bit(BUFFERING_RX, &port->flags)) { | |
633 | c = tty_insert_flip_string_fixed_flag(tty, data, TTY_NORMAL, n); | |
634 | if (c > 0) | |
635 | tty_flip_buffer_push(tty); | |
636 | n -= c; | |
637 | ||
638 | if (n) { | |
639 | /* start buffering and throttling */ | |
640 | n -= fwtty_buffer_rx(port, &data[c], n); | |
641 | ||
642 | spin_lock_bh(&port->lock); | |
643 | __fwtty_throttle(port, tty); | |
644 | spin_unlock_bh(&port->lock); | |
645 | } | |
646 | } else | |
647 | n -= fwtty_buffer_rx(port, data, n); | |
648 | ||
649 | if (n) { | |
650 | port->overrun = true; | |
651 | err = -EIO; | |
652 | } | |
653 | ||
654 | out: | |
655 | tty_kref_put(tty); | |
656 | ||
657 | port->icount.rx += len; | |
658 | port->stats.lost += n; | |
659 | return err; | |
660 | } | |
661 | ||
662 | /** | |
663 | * fwtty_port_handler - bus address handler for port reads/writes | |
664 | * @parameters: fw_address_callback_t as specified by firewire core interface | |
665 | * | |
666 | * This handler is responsible for handling inbound read/write dma from remotes. | |
667 | */ | |
668 | static void fwtty_port_handler(struct fw_card *card, | |
669 | struct fw_request *request, | |
670 | int tcode, int destination, int source, | |
671 | int generation, | |
672 | unsigned long long addr, | |
673 | void *data, size_t len, | |
674 | void *callback_data) | |
675 | { | |
676 | struct fwtty_port *port = callback_data; | |
677 | struct fwtty_peer *peer; | |
678 | int err; | |
679 | int rcode; | |
680 | ||
681 | /* Only accept rx from the peer virtual-cabled to this port */ | |
682 | rcu_read_lock(); | |
683 | peer = __fwserial_peer_by_node_id(card, generation, source); | |
684 | rcu_read_unlock(); | |
685 | if (!peer || peer != rcu_access_pointer(port->peer)) { | |
686 | rcode = RCODE_ADDRESS_ERROR; | |
687 | fwtty_err_ratelimited(port, "ignoring unauthenticated data"); | |
688 | goto respond; | |
689 | } | |
690 | ||
691 | switch (tcode) { | |
692 | case TCODE_WRITE_QUADLET_REQUEST: | |
693 | if (addr != port->rx_handler.offset || len != 4) | |
694 | rcode = RCODE_ADDRESS_ERROR; | |
695 | else { | |
696 | fwtty_update_port_status(port, *(unsigned *)data); | |
697 | rcode = RCODE_COMPLETE; | |
698 | } | |
699 | break; | |
700 | ||
701 | case TCODE_WRITE_BLOCK_REQUEST: | |
702 | if (addr != port->rx_handler.offset + 4 || | |
703 | len > port->rx_handler.length - 4) { | |
704 | rcode = RCODE_ADDRESS_ERROR; | |
705 | } else { | |
706 | err = fwtty_rx(port, data, len); | |
707 | switch (err) { | |
708 | case 0: | |
709 | rcode = RCODE_COMPLETE; | |
710 | break; | |
711 | case -EIO: | |
712 | rcode = RCODE_DATA_ERROR; | |
713 | break; | |
714 | default: | |
715 | rcode = RCODE_CONFLICT_ERROR; | |
716 | break; | |
717 | } | |
718 | } | |
719 | break; | |
720 | ||
721 | default: | |
722 | rcode = RCODE_TYPE_ERROR; | |
723 | } | |
724 | ||
725 | respond: | |
726 | fw_send_response(card, request, rcode); | |
727 | } | |
728 | ||
729 | /** | |
730 | * fwtty_tx_complete - callback for tx dma | |
731 | * @data: ignored, has no meaning for write txns | |
732 | * @length: ignored, has no meaning for write txns | |
733 | * | |
734 | * The writer must be woken here if the fifo has been emptied because it | |
735 | * may have slept if chars_in_buffer was != 0 | |
736 | */ | |
737 | static void fwtty_tx_complete(struct fw_card *card, int rcode, | |
738 | void *data, size_t length, | |
739 | struct fwtty_transaction *txn) | |
740 | { | |
741 | struct fwtty_port *port = txn->port; | |
742 | struct tty_struct *tty; | |
743 | int len; | |
744 | ||
745 | fwtty_dbg(port, "rcode: %d", rcode); | |
746 | ||
747 | switch (rcode) { | |
748 | case RCODE_COMPLETE: | |
749 | spin_lock_bh(&port->lock); | |
750 | dma_fifo_out_complete(&port->tx_fifo, &txn->dma_pended); | |
751 | len = dma_fifo_level(&port->tx_fifo); | |
752 | spin_unlock_bh(&port->lock); | |
753 | ||
754 | port->icount.tx += txn->dma_pended.len; | |
755 | break; | |
756 | ||
757 | default: | |
758 | /* TODO: implement retries */ | |
759 | spin_lock_bh(&port->lock); | |
760 | dma_fifo_out_complete(&port->tx_fifo, &txn->dma_pended); | |
761 | len = dma_fifo_level(&port->tx_fifo); | |
762 | spin_unlock_bh(&port->lock); | |
763 | ||
764 | port->stats.dropped += txn->dma_pended.len; | |
765 | } | |
766 | ||
767 | if (len < WAKEUP_CHARS) { | |
768 | tty = tty_port_tty_get(&port->port); | |
769 | if (tty) { | |
770 | tty_wakeup(tty); | |
771 | tty_kref_put(tty); | |
772 | } | |
773 | } | |
774 | } | |
775 | ||
776 | static int fwtty_tx(struct fwtty_port *port, bool drain) | |
777 | { | |
778 | struct fwtty_peer *peer; | |
779 | struct fwtty_transaction *txn; | |
780 | struct tty_struct *tty; | |
781 | int n, len; | |
782 | ||
783 | tty = tty_port_tty_get(&port->port); | |
784 | if (!tty) | |
785 | return -ENOENT; | |
786 | ||
787 | rcu_read_lock(); | |
788 | peer = rcu_dereference(port->peer); | |
789 | if (!peer) { | |
790 | n = -EIO; | |
791 | goto out; | |
792 | } | |
793 | ||
794 | if (test_and_set_bit(IN_TX, &port->flags)) { | |
795 | n = -EALREADY; | |
796 | goto out; | |
797 | } | |
798 | ||
799 | /* try to write as many dma transactions out as possible */ | |
800 | n = -EAGAIN; | |
801 | while (!tty->stopped && !tty->hw_stopped && | |
802 | !test_bit(STOP_TX, &port->flags)) { | |
803 | txn = kmem_cache_alloc(fwtty_txn_cache, GFP_ATOMIC); | |
804 | if (!txn) { | |
805 | n = -ENOMEM; | |
806 | break; | |
807 | } | |
808 | ||
809 | spin_lock_bh(&port->lock); | |
810 | n = dma_fifo_out_pend(&port->tx_fifo, &txn->dma_pended); | |
811 | spin_unlock_bh(&port->lock); | |
812 | ||
813 | fwtty_dbg(port, "out: %u rem: %d", txn->dma_pended.len, n); | |
814 | ||
815 | if (n < 0) { | |
816 | kmem_cache_free(fwtty_txn_cache, txn); | |
817 | if (n == -EAGAIN) | |
818 | ++port->stats.tx_stall; | |
819 | else if (n == -ENODATA) | |
820 | profile_size_distrib(port->stats.txns, 0); | |
821 | else { | |
822 | ++port->stats.fifo_errs; | |
823 | fwtty_err_ratelimited(port, "fifo err: %d", n); | |
824 | } | |
825 | break; | |
826 | } | |
827 | ||
828 | profile_size_distrib(port->stats.txns, txn->dma_pended.len); | |
829 | ||
830 | fwtty_send_txn_async(peer, txn, TCODE_WRITE_BLOCK_REQUEST, | |
831 | peer->fifo_addr, txn->dma_pended.data, | |
832 | txn->dma_pended.len, fwtty_tx_complete, | |
833 | port); | |
834 | ++port->stats.sent; | |
835 | ||
836 | /* | |
837 | * Stop tx if the 'last view' of the fifo is empty or if | |
838 | * this is the writer and there's not enough data to bother | |
839 | */ | |
840 | if (n == 0 || (!drain && n < WRITER_MINIMUM)) | |
841 | break; | |
842 | } | |
843 | ||
844 | if (n >= 0 || n == -EAGAIN || n == -ENOMEM || n == -ENODATA) { | |
845 | spin_lock_bh(&port->lock); | |
846 | len = dma_fifo_out_level(&port->tx_fifo); | |
847 | if (len) { | |
848 | unsigned long delay = (n == -ENOMEM) ? HZ : 1; | |
849 | schedule_delayed_work(&port->drain, delay); | |
850 | } | |
851 | len = dma_fifo_level(&port->tx_fifo); | |
852 | spin_unlock_bh(&port->lock); | |
853 | ||
854 | /* wakeup the writer */ | |
855 | if (drain && len < WAKEUP_CHARS) | |
856 | tty_wakeup(tty); | |
857 | } | |
858 | ||
859 | clear_bit(IN_TX, &port->flags); | |
860 | wake_up_interruptible(&port->wait_tx); | |
861 | ||
862 | out: | |
863 | rcu_read_unlock(); | |
864 | tty_kref_put(tty); | |
865 | return n; | |
866 | } | |
867 | ||
868 | static void fwtty_drain_tx(struct work_struct *work) | |
869 | { | |
870 | struct fwtty_port *port = to_port(to_delayed_work(work), drain); | |
871 | ||
872 | fwtty_tx(port, true); | |
873 | } | |
874 | ||
875 | static void fwtty_write_xchar(struct fwtty_port *port, char ch) | |
876 | { | |
877 | struct fwtty_peer *peer; | |
878 | ||
879 | ++port->stats.xchars; | |
880 | ||
881 | fwtty_dbg(port, "%02x", ch); | |
882 | ||
883 | rcu_read_lock(); | |
884 | peer = rcu_dereference(port->peer); | |
885 | if (peer) { | |
886 | fwtty_send_data_async(peer, TCODE_WRITE_BLOCK_REQUEST, | |
887 | peer->fifo_addr, &ch, sizeof(ch), | |
888 | NULL, port); | |
889 | } | |
890 | rcu_read_unlock(); | |
891 | } | |
892 | ||
893 | struct fwtty_port *fwtty_port_get(unsigned index) | |
894 | { | |
895 | struct fwtty_port *port; | |
896 | ||
897 | if (index >= MAX_TOTAL_PORTS) | |
898 | return NULL; | |
899 | ||
900 | mutex_lock(&port_table_lock); | |
901 | port = port_table[index]; | |
902 | if (port) | |
903 | kref_get(&port->serial->kref); | |
904 | mutex_unlock(&port_table_lock); | |
905 | return port; | |
906 | } | |
907 | EXPORT_SYMBOL(fwtty_port_get); | |
908 | ||
909 | static int fwtty_ports_add(struct fw_serial *serial) | |
910 | { | |
911 | int err = -EBUSY; | |
912 | int i, j; | |
913 | ||
914 | if (port_table_corrupt) | |
915 | return err; | |
916 | ||
917 | mutex_lock(&port_table_lock); | |
918 | for (i = 0; i + num_ports <= MAX_TOTAL_PORTS; i += num_ports) { | |
919 | if (!port_table[i]) { | |
920 | for (j = 0; j < num_ports; ++i, ++j) { | |
921 | serial->ports[j]->index = i; | |
922 | port_table[i] = serial->ports[j]; | |
923 | } | |
924 | err = 0; | |
925 | break; | |
926 | } | |
927 | } | |
928 | mutex_unlock(&port_table_lock); | |
929 | return err; | |
930 | } | |
931 | ||
932 | static void fwserial_destroy(struct kref *kref) | |
933 | { | |
934 | struct fw_serial *serial = to_serial(kref, kref); | |
935 | struct fwtty_port **ports = serial->ports; | |
936 | int j, i = ports[0]->index; | |
937 | ||
938 | synchronize_rcu(); | |
939 | ||
940 | mutex_lock(&port_table_lock); | |
941 | for (j = 0; j < num_ports; ++i, ++j) { | |
942 | static bool once; | |
943 | int corrupt = port_table[i] != ports[j]; | |
944 | if (corrupt && !once) { | |
945 | WARN(corrupt, "port_table[%d]: %p != ports[%d]: %p", | |
946 | i, port_table[i], j, ports[j]); | |
947 | once = true; | |
948 | port_table_corrupt = true; | |
949 | } | |
950 | ||
951 | port_table[i] = NULL; | |
952 | } | |
953 | mutex_unlock(&port_table_lock); | |
954 | ||
955 | for (j = 0; j < num_ports; ++j) { | |
956 | fw_core_remove_address_handler(&ports[j]->rx_handler); | |
957 | dma_fifo_free(&ports[j]->tx_fifo); | |
958 | kfree(ports[j]); | |
959 | } | |
960 | kfree(serial); | |
961 | } | |
962 | ||
963 | void fwtty_port_put(struct fwtty_port *port) | |
964 | { | |
965 | kref_put(&port->serial->kref, fwserial_destroy); | |
966 | } | |
967 | EXPORT_SYMBOL(fwtty_port_put); | |
968 | ||
969 | static void fwtty_port_dtr_rts(struct tty_port *tty_port, int on) | |
970 | { | |
971 | struct fwtty_port *port = to_port(tty_port, port); | |
972 | ||
973 | fwtty_dbg(port, "on/off: %d", on); | |
974 | ||
975 | spin_lock_bh(&port->lock); | |
976 | /* Don't change carrier state if this is a console */ | |
977 | if (!port->port.console) { | |
978 | if (on) | |
979 | port->mctrl |= TIOCM_DTR | TIOCM_RTS; | |
980 | else | |
981 | port->mctrl &= ~(TIOCM_DTR | TIOCM_RTS); | |
982 | } | |
983 | ||
984 | __fwtty_write_port_status(port); | |
985 | spin_unlock_bh(&port->lock); | |
986 | } | |
987 | ||
988 | /** | |
989 | * fwtty_port_carrier_raised: required tty_port operation | |
990 | * | |
991 | * This port operation is polled after a tty has been opened and is waiting for | |
992 | * carrier detect -- see drivers/tty/tty_port:tty_port_block_til_ready(). | |
993 | */ | |
994 | static int fwtty_port_carrier_raised(struct tty_port *tty_port) | |
995 | { | |
996 | struct fwtty_port *port = to_port(tty_port, port); | |
997 | int rc; | |
998 | ||
999 | rc = (port->mstatus & TIOCM_CAR); | |
1000 | ||
1001 | fwtty_dbg(port, "%d", rc); | |
1002 | ||
1003 | return rc; | |
1004 | } | |
1005 | ||
1006 | static unsigned set_termios(struct fwtty_port *port, struct tty_struct *tty) | |
1007 | { | |
1008 | unsigned baud, frame; | |
1009 | ||
1010 | baud = tty_termios_baud_rate(&tty->termios); | |
1011 | tty_termios_encode_baud_rate(&tty->termios, baud, baud); | |
1012 | ||
1013 | /* compute bit count of 2 frames */ | |
1014 | frame = 12 + ((C_CSTOPB(tty)) ? 4 : 2) + ((C_PARENB(tty)) ? 2 : 0); | |
1015 | ||
1016 | switch (C_CSIZE(tty)) { | |
1017 | case CS5: | |
1018 | frame -= (C_CSTOPB(tty)) ? 1 : 0; | |
1019 | break; | |
1020 | case CS6: | |
1021 | frame += 2; | |
1022 | break; | |
1023 | case CS7: | |
1024 | frame += 4; | |
1025 | break; | |
1026 | case CS8: | |
1027 | frame += 6; | |
1028 | break; | |
1029 | } | |
1030 | ||
1031 | port->cps = (baud << 1) / frame; | |
1032 | ||
1033 | port->status_mask = UART_LSR_OE; | |
1034 | if (_I_FLAG(tty, BRKINT | PARMRK)) | |
1035 | port->status_mask |= UART_LSR_BI; | |
1036 | ||
1037 | port->ignore_mask = 0; | |
1038 | if (I_IGNBRK(tty)) { | |
1039 | port->ignore_mask |= UART_LSR_BI; | |
1040 | if (I_IGNPAR(tty)) | |
1041 | port->ignore_mask |= UART_LSR_OE; | |
1042 | } | |
1043 | ||
1044 | port->write_only = !C_CREAD(tty); | |
1045 | ||
1046 | /* turn off echo and newline xlat if loopback */ | |
1047 | if (port->loopback) { | |
1048 | tty->termios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHOKE | | |
1049 | ECHONL | ECHOPRT | ECHOCTL); | |
1050 | tty->termios.c_oflag &= ~ONLCR; | |
1051 | } | |
1052 | ||
1053 | return baud; | |
1054 | } | |
1055 | ||
1056 | static int fwtty_port_activate(struct tty_port *tty_port, | |
1057 | struct tty_struct *tty) | |
1058 | { | |
1059 | struct fwtty_port *port = to_port(tty_port, port); | |
1060 | unsigned baud; | |
1061 | int err; | |
1062 | ||
1063 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1064 | ||
1065 | err = dma_fifo_alloc(&port->tx_fifo, FWTTY_PORT_TXFIFO_LEN, | |
1066 | cache_line_size(), | |
1067 | port->max_payload, | |
1068 | FWTTY_PORT_MAX_PEND_DMA, | |
1069 | GFP_KERNEL); | |
1070 | if (err) | |
1071 | return err; | |
1072 | ||
1073 | spin_lock_bh(&port->lock); | |
1074 | ||
1075 | baud = set_termios(port, tty); | |
1076 | ||
1077 | /* if console, don't change carrier state */ | |
1078 | if (!port->port.console) { | |
1079 | port->mctrl = 0; | |
1080 | if (baud != 0) | |
1081 | port->mctrl = TIOCM_DTR | TIOCM_RTS; | |
1082 | } | |
1083 | ||
1084 | if (C_CRTSCTS(tty) && ~port->mstatus & TIOCM_CTS) | |
1085 | tty->hw_stopped = 1; | |
1086 | ||
1087 | __fwtty_write_port_status(port); | |
1088 | spin_unlock_bh(&port->lock); | |
1089 | ||
1090 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | /** | |
1096 | * fwtty_port_shutdown | |
1097 | * | |
1098 | * Note: the tty port core ensures this is not the console and | |
1099 | * manages TTY_IO_ERROR properly | |
1100 | */ | |
1101 | static void fwtty_port_shutdown(struct tty_port *tty_port) | |
1102 | { | |
1103 | struct fwtty_port *port = to_port(tty_port, port); | |
1104 | struct buffered_rx *buf, *next; | |
1105 | ||
1106 | /* TODO: cancel outstanding transactions */ | |
1107 | ||
1108 | cancel_delayed_work_sync(&port->emit_breaks); | |
1109 | cancel_delayed_work_sync(&port->drain); | |
1110 | cancel_work_sync(&port->push); | |
1111 | ||
1112 | spin_lock_bh(&port->lock); | |
1113 | list_for_each_entry_safe(buf, next, &port->buf_list, list) { | |
1114 | list_del(&buf->list); | |
1115 | kfree(buf); | |
1116 | } | |
1117 | port->buffered = 0; | |
1118 | port->flags = 0; | |
1119 | port->break_ctl = 0; | |
1120 | port->overrun = 0; | |
1121 | __fwtty_write_port_status(port); | |
1122 | dma_fifo_free(&port->tx_fifo); | |
1123 | spin_unlock_bh(&port->lock); | |
1124 | } | |
1125 | ||
1126 | static int fwtty_open(struct tty_struct *tty, struct file *fp) | |
1127 | { | |
1128 | struct fwtty_port *port = tty->driver_data; | |
1129 | ||
1130 | return tty_port_open(&port->port, tty, fp); | |
1131 | } | |
1132 | ||
1133 | static void fwtty_close(struct tty_struct *tty, struct file *fp) | |
1134 | { | |
1135 | struct fwtty_port *port = tty->driver_data; | |
1136 | ||
1137 | tty_port_close(&port->port, tty, fp); | |
1138 | } | |
1139 | ||
1140 | static void fwtty_hangup(struct tty_struct *tty) | |
1141 | { | |
1142 | struct fwtty_port *port = tty->driver_data; | |
1143 | ||
1144 | tty_port_hangup(&port->port); | |
1145 | } | |
1146 | ||
1147 | static void fwtty_cleanup(struct tty_struct *tty) | |
1148 | { | |
1149 | struct fwtty_port *port = tty->driver_data; | |
1150 | ||
1151 | tty->driver_data = NULL; | |
1152 | fwtty_port_put(port); | |
1153 | } | |
1154 | ||
1155 | static int fwtty_install(struct tty_driver *driver, struct tty_struct *tty) | |
1156 | { | |
1157 | struct fwtty_port *port = fwtty_port_get(tty->index); | |
1158 | int err; | |
1159 | ||
1160 | err = tty_standard_install(driver, tty); | |
1161 | if (!err) | |
1162 | tty->driver_data = port; | |
1163 | else | |
1164 | fwtty_port_put(port); | |
1165 | return err; | |
1166 | } | |
1167 | ||
1168 | static int fwtty_write(struct tty_struct *tty, const unsigned char *buf, int c) | |
1169 | { | |
1170 | struct fwtty_port *port = tty->driver_data; | |
1171 | int n, len; | |
1172 | ||
1173 | fwtty_dbg(port, "%d", c); | |
1174 | profile_size_distrib(port->stats.writes, c); | |
1175 | ||
1176 | spin_lock_bh(&port->lock); | |
1177 | n = dma_fifo_in(&port->tx_fifo, buf, c); | |
1178 | len = dma_fifo_out_level(&port->tx_fifo); | |
1179 | if (len < DRAIN_THRESHOLD) | |
1180 | schedule_delayed_work(&port->drain, 1); | |
1181 | spin_unlock_bh(&port->lock); | |
1182 | ||
1183 | if (len >= DRAIN_THRESHOLD) | |
1184 | fwtty_tx(port, false); | |
1185 | ||
1186 | debug_short_write(port, c, n); | |
1187 | ||
1188 | return (n < 0) ? 0 : n; | |
1189 | } | |
1190 | ||
1191 | static int fwtty_write_room(struct tty_struct *tty) | |
1192 | { | |
1193 | struct fwtty_port *port = tty->driver_data; | |
1194 | int n; | |
1195 | ||
1196 | spin_lock_bh(&port->lock); | |
1197 | n = dma_fifo_avail(&port->tx_fifo); | |
1198 | spin_unlock_bh(&port->lock); | |
1199 | ||
1200 | fwtty_dbg(port, "%d", n); | |
1201 | ||
1202 | return n; | |
1203 | } | |
1204 | ||
1205 | static int fwtty_chars_in_buffer(struct tty_struct *tty) | |
1206 | { | |
1207 | struct fwtty_port *port = tty->driver_data; | |
1208 | int n; | |
1209 | ||
1210 | spin_lock_bh(&port->lock); | |
1211 | n = dma_fifo_level(&port->tx_fifo); | |
1212 | spin_unlock_bh(&port->lock); | |
1213 | ||
1214 | fwtty_dbg(port, "%d", n); | |
1215 | ||
1216 | return n; | |
1217 | } | |
1218 | ||
1219 | static void fwtty_send_xchar(struct tty_struct *tty, char ch) | |
1220 | { | |
1221 | struct fwtty_port *port = tty->driver_data; | |
1222 | ||
1223 | fwtty_dbg(port, "%02x", ch); | |
1224 | ||
1225 | fwtty_write_xchar(port, ch); | |
1226 | } | |
1227 | ||
1228 | static void fwtty_throttle(struct tty_struct *tty) | |
1229 | { | |
1230 | struct fwtty_port *port = tty->driver_data; | |
1231 | ||
1232 | /* | |
1233 | * Ignore throttling (but not unthrottling). | |
1234 | * It only makes sense to throttle when data will no longer be | |
1235 | * accepted by the tty flip buffer. For example, it is | |
1236 | * possible for received data to overflow the tty buffer long | |
1237 | * before the line discipline ever has a chance to throttle the driver. | |
1238 | * Additionally, the driver may have already completed the I/O | |
1239 | * but the tty buffer is still emptying, so the line discipline is | |
1240 | * throttling and unthrottling nothing. | |
1241 | */ | |
1242 | ||
1243 | ++port->stats.throttled; | |
1244 | } | |
1245 | ||
1246 | static void fwtty_unthrottle(struct tty_struct *tty) | |
1247 | { | |
1248 | struct fwtty_port *port = tty->driver_data; | |
1249 | ||
1250 | fwtty_dbg(port, "CRTSCTS: %d", (C_CRTSCTS(tty) != 0)); | |
1251 | ||
1252 | profile_fifo_avail(port, port->stats.unthrottle); | |
1253 | ||
1254 | schedule_work(&port->push); | |
1255 | ||
1256 | spin_lock_bh(&port->lock); | |
1257 | port->mctrl &= ~OOB_RX_THROTTLE; | |
1258 | if (C_CRTSCTS(tty)) | |
1259 | port->mctrl |= TIOCM_RTS; | |
1260 | __fwtty_write_port_status(port); | |
1261 | spin_unlock_bh(&port->lock); | |
1262 | } | |
1263 | ||
1264 | static int check_msr_delta(struct fwtty_port *port, unsigned long mask, | |
1265 | struct async_icount *prev) | |
1266 | { | |
1267 | struct async_icount now; | |
1268 | int delta; | |
1269 | ||
1270 | now = port->icount; | |
1271 | ||
1272 | delta = ((mask & TIOCM_RNG && prev->rng != now.rng) || | |
1273 | (mask & TIOCM_DSR && prev->dsr != now.dsr) || | |
1274 | (mask & TIOCM_CAR && prev->dcd != now.dcd) || | |
1275 | (mask & TIOCM_CTS && prev->cts != now.cts)); | |
1276 | ||
1277 | *prev = now; | |
1278 | ||
1279 | return delta; | |
1280 | } | |
1281 | ||
1282 | static int wait_msr_change(struct fwtty_port *port, unsigned long mask) | |
1283 | { | |
1284 | struct async_icount prev; | |
1285 | ||
1286 | prev = port->icount; | |
1287 | ||
1288 | return wait_event_interruptible(port->port.delta_msr_wait, | |
1289 | check_msr_delta(port, mask, &prev)); | |
1290 | } | |
1291 | ||
1292 | static int get_serial_info(struct fwtty_port *port, | |
1293 | struct serial_struct __user *info) | |
1294 | { | |
1295 | struct serial_struct tmp; | |
1296 | ||
1297 | memset(&tmp, 0, sizeof(tmp)); | |
1298 | ||
1299 | tmp.type = PORT_UNKNOWN; | |
1300 | tmp.line = port->port.tty->index; | |
1301 | tmp.flags = port->port.flags; | |
1302 | tmp.xmit_fifo_size = FWTTY_PORT_TXFIFO_LEN; | |
1303 | tmp.baud_base = 400000000; | |
1304 | tmp.close_delay = port->port.close_delay; | |
1305 | ||
1306 | return (copy_to_user(info, &tmp, sizeof(*info))) ? -EFAULT : 0; | |
1307 | } | |
1308 | ||
1309 | static int set_serial_info(struct fwtty_port *port, | |
1310 | struct serial_struct __user *info) | |
1311 | { | |
1312 | struct serial_struct tmp; | |
1313 | ||
1314 | if (copy_from_user(&tmp, info, sizeof(tmp))) | |
1315 | return -EFAULT; | |
1316 | ||
1317 | if (tmp.irq != 0 || tmp.port != 0 || tmp.custom_divisor != 0 || | |
1318 | tmp.baud_base != 400000000) | |
1319 | return -EPERM; | |
1320 | ||
1321 | if (!capable(CAP_SYS_ADMIN)) { | |
1322 | if (((tmp.flags & ~ASYNC_USR_MASK) != | |
1323 | (port->port.flags & ~ASYNC_USR_MASK))) | |
1324 | return -EPERM; | |
1325 | } else | |
1326 | port->port.close_delay = tmp.close_delay * HZ / 100; | |
1327 | ||
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | static int fwtty_ioctl(struct tty_struct *tty, unsigned cmd, | |
1332 | unsigned long arg) | |
1333 | { | |
1334 | struct fwtty_port *port = tty->driver_data; | |
1335 | int err; | |
1336 | ||
1337 | switch (cmd) { | |
1338 | case TIOCGSERIAL: | |
1339 | mutex_lock(&port->port.mutex); | |
1340 | err = get_serial_info(port, (void __user *)arg); | |
1341 | mutex_unlock(&port->port.mutex); | |
1342 | break; | |
1343 | ||
1344 | case TIOCSSERIAL: | |
1345 | mutex_lock(&port->port.mutex); | |
1346 | err = set_serial_info(port, (void __user *)arg); | |
1347 | mutex_unlock(&port->port.mutex); | |
1348 | break; | |
1349 | ||
1350 | case TIOCMIWAIT: | |
1351 | err = wait_msr_change(port, arg); | |
1352 | break; | |
1353 | ||
1354 | default: | |
1355 | err = -ENOIOCTLCMD; | |
1356 | } | |
1357 | ||
1358 | return err; | |
1359 | } | |
1360 | ||
1361 | static void fwtty_set_termios(struct tty_struct *tty, struct ktermios *old) | |
1362 | { | |
1363 | struct fwtty_port *port = tty->driver_data; | |
1364 | unsigned baud; | |
1365 | ||
1366 | spin_lock_bh(&port->lock); | |
1367 | baud = set_termios(port, tty); | |
1368 | ||
1369 | if ((baud == 0) && (old->c_cflag & CBAUD)) | |
1370 | port->mctrl &= ~(TIOCM_DTR | TIOCM_RTS); | |
1371 | else if ((baud != 0) && !(old->c_cflag & CBAUD)) { | |
1372 | if (C_CRTSCTS(tty) || !test_bit(TTY_THROTTLED, &tty->flags)) | |
1373 | port->mctrl |= TIOCM_DTR | TIOCM_RTS; | |
1374 | else | |
1375 | port->mctrl |= TIOCM_DTR; | |
1376 | } | |
1377 | __fwtty_write_port_status(port); | |
1378 | spin_unlock_bh(&port->lock); | |
1379 | ||
1380 | if (old->c_cflag & CRTSCTS) { | |
1381 | if (!C_CRTSCTS(tty)) { | |
1382 | tty->hw_stopped = 0; | |
1383 | fwtty_restart_tx(port); | |
1384 | } | |
1385 | } else if (C_CRTSCTS(tty) && ~port->mstatus & TIOCM_CTS) { | |
1386 | tty->hw_stopped = 1; | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | /** | |
1391 | * fwtty_break_ctl - start/stop sending breaks | |
1392 | * | |
1393 | * Signals the remote to start or stop generating simulated breaks. | |
1394 | * First, stop dequeueing from the fifo and wait for writer/drain to leave tx | |
1395 | * before signalling the break line status. This guarantees any pending rx will | |
1396 | * be queued to the line discipline before break is simulated on the remote. | |
1397 | * Conversely, turning off break_ctl requires signalling the line status change, | |
1398 | * then enabling tx. | |
1399 | */ | |
1400 | static int fwtty_break_ctl(struct tty_struct *tty, int state) | |
1401 | { | |
1402 | struct fwtty_port *port = tty->driver_data; | |
1403 | long ret; | |
1404 | ||
1405 | fwtty_dbg(port, "%d", state); | |
1406 | ||
1407 | if (state == -1) { | |
1408 | set_bit(STOP_TX, &port->flags); | |
1409 | ret = wait_event_interruptible_timeout(port->wait_tx, | |
1410 | !test_bit(IN_TX, &port->flags), | |
1411 | 10); | |
1412 | if (ret == 0 || ret == -ERESTARTSYS) { | |
1413 | clear_bit(STOP_TX, &port->flags); | |
1414 | fwtty_restart_tx(port); | |
1415 | return -EINTR; | |
1416 | } | |
1417 | } | |
1418 | ||
1419 | spin_lock_bh(&port->lock); | |
1420 | port->break_ctl = (state == -1); | |
1421 | __fwtty_write_port_status(port); | |
1422 | spin_unlock_bh(&port->lock); | |
1423 | ||
1424 | if (state == 0) { | |
1425 | spin_lock_bh(&port->lock); | |
1426 | dma_fifo_reset(&port->tx_fifo); | |
1427 | clear_bit(STOP_TX, &port->flags); | |
1428 | spin_unlock_bh(&port->lock); | |
1429 | } | |
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | static int fwtty_tiocmget(struct tty_struct *tty) | |
1434 | { | |
1435 | struct fwtty_port *port = tty->driver_data; | |
1436 | unsigned tiocm; | |
1437 | ||
1438 | spin_lock_bh(&port->lock); | |
1439 | tiocm = (port->mctrl & MCTRL_MASK) | (port->mstatus & ~MCTRL_MASK); | |
1440 | spin_unlock_bh(&port->lock); | |
1441 | ||
1442 | fwtty_dbg(port, "%x", tiocm); | |
1443 | ||
1444 | return tiocm; | |
1445 | } | |
1446 | ||
1447 | static int fwtty_tiocmset(struct tty_struct *tty, unsigned set, unsigned clear) | |
1448 | { | |
1449 | struct fwtty_port *port = tty->driver_data; | |
1450 | ||
1451 | fwtty_dbg(port, "set: %x clear: %x", set, clear); | |
1452 | ||
1453 | /* TODO: simulate loopback if TIOCM_LOOP set */ | |
1454 | ||
1455 | spin_lock_bh(&port->lock); | |
1456 | port->mctrl &= ~(clear & MCTRL_MASK & 0xffff); | |
1457 | port->mctrl |= set & MCTRL_MASK & 0xffff; | |
1458 | __fwtty_write_port_status(port); | |
1459 | spin_unlock_bh(&port->lock); | |
1460 | return 0; | |
1461 | } | |
1462 | ||
1463 | static int fwtty_get_icount(struct tty_struct *tty, | |
1464 | struct serial_icounter_struct *icount) | |
1465 | { | |
1466 | struct fwtty_port *port = tty->driver_data; | |
1467 | struct stats stats; | |
1468 | ||
1469 | memcpy(&stats, &port->stats, sizeof(stats)); | |
1470 | if (port->port.console) | |
1471 | (*port->fwcon_ops->stats)(&stats, port->con_data); | |
1472 | ||
1473 | icount->cts = port->icount.cts; | |
1474 | icount->dsr = port->icount.dsr; | |
1475 | icount->rng = port->icount.rng; | |
1476 | icount->dcd = port->icount.dcd; | |
1477 | icount->rx = port->icount.rx; | |
1478 | icount->tx = port->icount.tx + stats.xchars; | |
1479 | icount->frame = port->icount.frame; | |
1480 | icount->overrun = port->icount.overrun; | |
1481 | icount->parity = port->icount.parity; | |
1482 | icount->brk = port->icount.brk; | |
1483 | icount->buf_overrun = port->icount.overrun; | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | static void fwtty_proc_show_port(struct seq_file *m, struct fwtty_port *port) | |
1488 | { | |
1489 | struct stats stats; | |
1490 | ||
1491 | memcpy(&stats, &port->stats, sizeof(stats)); | |
1492 | if (port->port.console) | |
1493 | (*port->fwcon_ops->stats)(&stats, port->con_data); | |
1494 | ||
1495 | seq_printf(m, " tx:%d rx:%d", port->icount.tx + stats.xchars, | |
1496 | port->icount.rx); | |
1497 | seq_printf(m, " cts:%d dsr:%d rng:%d dcd:%d", port->icount.cts, | |
1498 | port->icount.dsr, port->icount.rng, port->icount.dcd); | |
1499 | seq_printf(m, " fe:%d oe:%d pe:%d brk:%d", port->icount.frame, | |
1500 | port->icount.overrun, port->icount.parity, port->icount.brk); | |
1501 | seq_printf(m, " dr:%d st:%d err:%d lost:%d", stats.dropped, | |
1502 | stats.tx_stall, stats.fifo_errs, stats.lost); | |
1503 | seq_printf(m, " pkts:%d thr:%d wtrmk:%d", stats.sent, stats.throttled, | |
1504 | stats.watermark); | |
1505 | seq_printf(m, " addr:%012llx", port->rx_handler.offset); | |
1506 | ||
1507 | if (port->port.console) { | |
1508 | seq_printf(m, "\n "); | |
1509 | (*port->fwcon_ops->proc_show)(m, port->con_data); | |
1510 | } | |
1511 | ||
1512 | dump_profile(m, &port->stats); | |
1513 | } | |
1514 | ||
1515 | static void fwtty_proc_show_peer(struct seq_file *m, struct fwtty_peer *peer) | |
1516 | { | |
1517 | int generation = peer->generation; | |
1518 | ||
1519 | smp_rmb(); | |
1520 | seq_printf(m, " %s:", dev_name(&peer->unit->device)); | |
1521 | seq_printf(m, " node:%04x gen:%d", peer->node_id, generation); | |
1522 | seq_printf(m, " sp:%d max:%d guid:%016llx", peer->speed, | |
1523 | peer->max_payload, (unsigned long long) peer->guid); | |
1524 | ||
1525 | if (capable(CAP_SYS_ADMIN)) { | |
1526 | seq_printf(m, " mgmt:%012llx", | |
1527 | (unsigned long long) peer->mgmt_addr); | |
1528 | seq_printf(m, " addr:%012llx", | |
1529 | (unsigned long long) peer->status_addr); | |
1530 | } | |
1531 | seq_putc(m, '\n'); | |
1532 | } | |
1533 | ||
1534 | static int fwtty_proc_show(struct seq_file *m, void *v) | |
1535 | { | |
1536 | struct fwtty_port *port; | |
1537 | struct fw_serial *serial; | |
1538 | struct fwtty_peer *peer; | |
1539 | int i; | |
1540 | ||
1541 | seq_puts(m, "fwserinfo: 1.0 driver: 1.0\n"); | |
1542 | for (i = 0; i < MAX_TOTAL_PORTS && (port = fwtty_port_get(i)); ++i) { | |
1543 | seq_printf(m, "%2d:", i); | |
1544 | if (capable(CAP_SYS_ADMIN)) | |
1545 | fwtty_proc_show_port(m, port); | |
1546 | fwtty_port_put(port); | |
1547 | seq_printf(m, "\n"); | |
1548 | } | |
1549 | seq_putc(m, '\n'); | |
1550 | ||
1551 | rcu_read_lock(); | |
1552 | list_for_each_entry_rcu(serial, &fwserial_list, list) { | |
1553 | seq_printf(m, "card: %s guid: %016llx\n", | |
1554 | dev_name(serial->card->device), | |
1555 | (unsigned long long) serial->card->guid); | |
1556 | list_for_each_entry_rcu(peer, &serial->peer_list, list) | |
1557 | fwtty_proc_show_peer(m, peer); | |
1558 | } | |
1559 | rcu_read_unlock(); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | static int fwtty_proc_open(struct inode *inode, struct file *fp) | |
1564 | { | |
1565 | return single_open(fp, fwtty_proc_show, NULL); | |
1566 | } | |
1567 | ||
1568 | static const struct file_operations fwtty_proc_fops = { | |
1569 | .owner = THIS_MODULE, | |
1570 | .open = fwtty_proc_open, | |
1571 | .read = seq_read, | |
1572 | .llseek = seq_lseek, | |
1573 | .release = single_release, | |
1574 | }; | |
1575 | ||
1576 | static const struct tty_port_operations fwtty_port_ops = { | |
1577 | .dtr_rts = fwtty_port_dtr_rts, | |
1578 | .carrier_raised = fwtty_port_carrier_raised, | |
1579 | .shutdown = fwtty_port_shutdown, | |
1580 | .activate = fwtty_port_activate, | |
1581 | }; | |
1582 | ||
1583 | static const struct tty_operations fwtty_ops = { | |
1584 | .open = fwtty_open, | |
1585 | .close = fwtty_close, | |
1586 | .hangup = fwtty_hangup, | |
1587 | .cleanup = fwtty_cleanup, | |
1588 | .install = fwtty_install, | |
1589 | .write = fwtty_write, | |
1590 | .write_room = fwtty_write_room, | |
1591 | .chars_in_buffer = fwtty_chars_in_buffer, | |
1592 | .send_xchar = fwtty_send_xchar, | |
1593 | .throttle = fwtty_throttle, | |
1594 | .unthrottle = fwtty_unthrottle, | |
1595 | .ioctl = fwtty_ioctl, | |
1596 | .set_termios = fwtty_set_termios, | |
1597 | .break_ctl = fwtty_break_ctl, | |
1598 | .tiocmget = fwtty_tiocmget, | |
1599 | .tiocmset = fwtty_tiocmset, | |
1600 | .get_icount = fwtty_get_icount, | |
1601 | .proc_fops = &fwtty_proc_fops, | |
1602 | }; | |
1603 | ||
1604 | static inline int mgmt_pkt_expected_len(__be16 code) | |
1605 | { | |
1606 | static const struct fwserial_mgmt_pkt pkt; | |
1607 | ||
1608 | switch (be16_to_cpu(code)) { | |
1609 | case FWSC_VIRT_CABLE_PLUG: | |
1610 | return sizeof(pkt.hdr) + sizeof(pkt.plug_req); | |
1611 | ||
1612 | case FWSC_VIRT_CABLE_PLUG_RSP: /* | FWSC_RSP_OK */ | |
1613 | return sizeof(pkt.hdr) + sizeof(pkt.plug_rsp); | |
1614 | ||
1615 | ||
1616 | case FWSC_VIRT_CABLE_UNPLUG: | |
1617 | case FWSC_VIRT_CABLE_UNPLUG_RSP: | |
1618 | case FWSC_VIRT_CABLE_PLUG_RSP | FWSC_RSP_NACK: | |
1619 | case FWSC_VIRT_CABLE_UNPLUG_RSP | FWSC_RSP_NACK: | |
1620 | return sizeof(pkt.hdr); | |
1621 | ||
1622 | default: | |
1623 | return -1; | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | static inline void fill_plug_params(struct virt_plug_params *params, | |
1628 | struct fwtty_port *port) | |
1629 | { | |
1630 | u64 status_addr = port->rx_handler.offset; | |
1631 | u64 fifo_addr = port->rx_handler.offset + 4; | |
1632 | size_t fifo_len = port->rx_handler.length - 4; | |
1633 | ||
1634 | params->status_hi = cpu_to_be32(status_addr >> 32); | |
1635 | params->status_lo = cpu_to_be32(status_addr); | |
1636 | params->fifo_hi = cpu_to_be32(fifo_addr >> 32); | |
1637 | params->fifo_lo = cpu_to_be32(fifo_addr); | |
1638 | params->fifo_len = cpu_to_be32(fifo_len); | |
1639 | } | |
1640 | ||
1641 | static inline void fill_plug_req(struct fwserial_mgmt_pkt *pkt, | |
1642 | struct fwtty_port *port) | |
1643 | { | |
1644 | pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_PLUG); | |
1645 | pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code)); | |
1646 | fill_plug_params(&pkt->plug_req, port); | |
1647 | } | |
1648 | ||
1649 | static inline void fill_plug_rsp_ok(struct fwserial_mgmt_pkt *pkt, | |
1650 | struct fwtty_port *port) | |
1651 | { | |
1652 | pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_PLUG_RSP); | |
1653 | pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code)); | |
1654 | fill_plug_params(&pkt->plug_rsp, port); | |
1655 | } | |
1656 | ||
1657 | static inline void fill_plug_rsp_nack(struct fwserial_mgmt_pkt *pkt) | |
1658 | { | |
1659 | pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_PLUG_RSP | FWSC_RSP_NACK); | |
1660 | pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code)); | |
1661 | } | |
1662 | ||
1663 | static inline void fill_unplug_req(struct fwserial_mgmt_pkt *pkt) | |
1664 | { | |
1665 | pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_UNPLUG); | |
1666 | pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code)); | |
1667 | } | |
1668 | ||
1669 | static inline void fill_unplug_rsp_nack(struct fwserial_mgmt_pkt *pkt) | |
1670 | { | |
1671 | pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_UNPLUG_RSP | FWSC_RSP_NACK); | |
1672 | pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code)); | |
1673 | } | |
1674 | ||
1675 | static inline void fill_unplug_rsp_ok(struct fwserial_mgmt_pkt *pkt) | |
1676 | { | |
1677 | pkt->hdr.code = cpu_to_be16(FWSC_VIRT_CABLE_UNPLUG_RSP); | |
1678 | pkt->hdr.len = cpu_to_be16(mgmt_pkt_expected_len(pkt->hdr.code)); | |
1679 | } | |
1680 | ||
1681 | static void fwserial_virt_plug_complete(struct fwtty_peer *peer, | |
1682 | struct virt_plug_params *params) | |
1683 | { | |
1684 | struct fwtty_port *port = peer->port; | |
1685 | ||
1686 | peer->status_addr = be32_to_u64(params->status_hi, params->status_lo); | |
1687 | peer->fifo_addr = be32_to_u64(params->fifo_hi, params->fifo_lo); | |
1688 | peer->fifo_len = be32_to_cpu(params->fifo_len); | |
1689 | peer_set_state(peer, FWPS_ATTACHED); | |
1690 | ||
1691 | /* reconfigure tx_fifo optimally for this peer */ | |
1692 | spin_lock_bh(&port->lock); | |
1693 | port->max_payload = min3(peer->max_payload, peer->fifo_len, | |
1694 | MAX_ASYNC_PAYLOAD); | |
1695 | dma_fifo_change_tx_limit(&port->tx_fifo, port->max_payload); | |
1696 | spin_unlock_bh(&peer->port->lock); | |
1697 | ||
1698 | if (port->port.console && port->fwcon_ops->notify != NULL) | |
1699 | (*port->fwcon_ops->notify)(FWCON_NOTIFY_ATTACH, port->con_data); | |
1700 | ||
1701 | fwtty_info(&peer->unit, "peer (guid:%016llx) connected on %s", | |
1702 | (unsigned long long)peer->guid, dev_name(port->device)); | |
1703 | } | |
1704 | ||
1705 | static inline int fwserial_send_mgmt_sync(struct fwtty_peer *peer, | |
1706 | struct fwserial_mgmt_pkt *pkt) | |
1707 | { | |
1708 | int generation; | |
1709 | int rcode, tries = 5; | |
1710 | ||
1711 | do { | |
1712 | generation = peer->generation; | |
1713 | smp_rmb(); | |
1714 | ||
1715 | rcode = fw_run_transaction(peer->serial->card, | |
1716 | TCODE_WRITE_BLOCK_REQUEST, | |
1717 | peer->node_id, | |
1718 | generation, peer->speed, | |
1719 | peer->mgmt_addr, | |
1720 | pkt, be16_to_cpu(pkt->hdr.len)); | |
1721 | if (rcode == RCODE_BUSY || rcode == RCODE_SEND_ERROR || | |
1722 | rcode == RCODE_GENERATION) { | |
1723 | fwtty_dbg(&peer->unit, "mgmt write error: %d", rcode); | |
1724 | continue; | |
1725 | } else | |
1726 | break; | |
1727 | } while (--tries > 0); | |
1728 | return rcode; | |
1729 | } | |
1730 | ||
1731 | /** | |
1732 | * fwserial_claim_port - attempt to claim port @ index for peer | |
1733 | * | |
1734 | * Returns ptr to claimed port or error code (as ERR_PTR()) | |
1735 | * Can sleep - must be called from process context | |
1736 | */ | |
1737 | static struct fwtty_port *fwserial_claim_port(struct fwtty_peer *peer, | |
1738 | int index) | |
1739 | { | |
1740 | struct fwtty_port *port; | |
1741 | ||
1742 | if (index < 0 || index >= num_ports) | |
1743 | return ERR_PTR(-EINVAL); | |
1744 | ||
1745 | /* must guarantee that previous port releases have completed */ | |
1746 | synchronize_rcu(); | |
1747 | ||
1748 | port = peer->serial->ports[index]; | |
1749 | spin_lock_bh(&port->lock); | |
1750 | if (!rcu_access_pointer(port->peer)) | |
1751 | rcu_assign_pointer(port->peer, peer); | |
1752 | else | |
1753 | port = ERR_PTR(-EBUSY); | |
1754 | spin_unlock_bh(&port->lock); | |
1755 | ||
1756 | return port; | |
1757 | } | |
1758 | ||
1759 | /** | |
1760 | * fwserial_find_port - find avail port and claim for peer | |
1761 | * | |
1762 | * Returns ptr to claimed port or NULL if none avail | |
1763 | * Can sleep - must be called from process context | |
1764 | */ | |
1765 | static struct fwtty_port *fwserial_find_port(struct fwtty_peer *peer) | |
1766 | { | |
1767 | struct fwtty_port **ports = peer->serial->ports; | |
1768 | int i; | |
1769 | ||
1770 | /* must guarantee that previous port releases have completed */ | |
1771 | synchronize_rcu(); | |
1772 | ||
1773 | /* TODO: implement optional GUID-to-specific port # matching */ | |
1774 | ||
1775 | /* find an unattached port (but not the loopback port, if present) */ | |
1776 | for (i = 0; i < num_ttys; ++i) { | |
1777 | spin_lock_bh(&ports[i]->lock); | |
1778 | if (!ports[i]->peer) { | |
1779 | /* claim port */ | |
1780 | rcu_assign_pointer(ports[i]->peer, peer); | |
1781 | spin_unlock_bh(&ports[i]->lock); | |
1782 | return ports[i]; | |
1783 | } | |
1784 | spin_unlock_bh(&ports[i]->lock); | |
1785 | } | |
1786 | return NULL; | |
1787 | } | |
1788 | ||
1789 | static void fwserial_release_port(struct fwtty_port *port) | |
1790 | { | |
1791 | /* drop carrier (and all other line status) */ | |
1792 | fwtty_update_port_status(port, 0); | |
1793 | ||
1794 | spin_lock_bh(&port->lock); | |
1795 | ||
1796 | /* reset dma fifo max transmission size back to S100 */ | |
1797 | port->max_payload = link_speed_to_max_payload(SCODE_100); | |
1798 | dma_fifo_change_tx_limit(&port->tx_fifo, port->max_payload); | |
1799 | ||
1800 | rcu_assign_pointer(port->peer, NULL); | |
1801 | spin_unlock_bh(&port->lock); | |
1802 | ||
1803 | if (port->port.console && port->fwcon_ops->notify != NULL) | |
1804 | (*port->fwcon_ops->notify)(FWCON_NOTIFY_DETACH, port->con_data); | |
1805 | } | |
1806 | ||
1807 | static void fwserial_plug_timeout(unsigned long data) | |
1808 | { | |
1809 | struct fwtty_peer *peer = (struct fwtty_peer *) data; | |
1810 | struct fwtty_port *port; | |
1811 | ||
1812 | spin_lock_bh(&peer->lock); | |
1813 | if (peer->state != FWPS_PLUG_PENDING) { | |
1814 | spin_unlock_bh(&peer->lock); | |
1815 | return; | |
1816 | } | |
1817 | ||
1818 | port = peer_revert_state(peer); | |
1819 | spin_unlock_bh(&peer->lock); | |
1820 | ||
1821 | if (port) | |
1822 | fwserial_release_port(port); | |
1823 | } | |
1824 | ||
1825 | /** | |
1826 | * fwserial_connect_peer - initiate virtual cable with peer | |
1827 | * | |
1828 | * Returns 0 if VIRT_CABLE_PLUG request was successfully sent, | |
1829 | * otherwise error code. Must be called from process context. | |
1830 | */ | |
1831 | static int fwserial_connect_peer(struct fwtty_peer *peer) | |
1832 | { | |
1833 | struct fwtty_port *port; | |
1834 | struct fwserial_mgmt_pkt *pkt; | |
1835 | int err, rcode; | |
1836 | ||
1837 | pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); | |
1838 | if (!pkt) | |
1839 | return -ENOMEM; | |
1840 | ||
1841 | port = fwserial_find_port(peer); | |
1842 | if (!port) { | |
1843 | fwtty_err(&peer->unit, "avail ports in use"); | |
1844 | err = -EBUSY; | |
1845 | goto free_pkt; | |
1846 | } | |
1847 | ||
1848 | spin_lock_bh(&peer->lock); | |
1849 | ||
1850 | /* only initiate VIRT_CABLE_PLUG if peer is currently not attached */ | |
1851 | if (peer->state != FWPS_NOT_ATTACHED) { | |
1852 | err = -EBUSY; | |
1853 | goto release_port; | |
1854 | } | |
1855 | ||
1856 | peer->port = port; | |
1857 | peer_set_state(peer, FWPS_PLUG_PENDING); | |
1858 | ||
1859 | fill_plug_req(pkt, peer->port); | |
1860 | ||
1861 | setup_timer(&peer->timer, fwserial_plug_timeout, (unsigned long)peer); | |
1862 | mod_timer(&peer->timer, jiffies + VIRT_CABLE_PLUG_TIMEOUT); | |
1863 | spin_unlock_bh(&peer->lock); | |
1864 | ||
1865 | rcode = fwserial_send_mgmt_sync(peer, pkt); | |
1866 | ||
1867 | spin_lock_bh(&peer->lock); | |
1868 | if (peer->state == FWPS_PLUG_PENDING && rcode != RCODE_COMPLETE) { | |
1869 | if (rcode == RCODE_CONFLICT_ERROR) | |
1870 | err = -EAGAIN; | |
1871 | else | |
1872 | err = -EIO; | |
1873 | goto cancel_timer; | |
1874 | } | |
1875 | spin_unlock_bh(&peer->lock); | |
1876 | ||
1877 | kfree(pkt); | |
1878 | return 0; | |
1879 | ||
1880 | cancel_timer: | |
1881 | del_timer(&peer->timer); | |
1882 | peer_revert_state(peer); | |
1883 | release_port: | |
1884 | spin_unlock_bh(&peer->lock); | |
1885 | fwserial_release_port(port); | |
1886 | free_pkt: | |
1887 | kfree(pkt); | |
1888 | return err; | |
1889 | } | |
1890 | ||
1891 | /** | |
1892 | * fwserial_close_port - | |
1893 | * HUP the tty (if the tty exists) and unregister the tty device. | |
1894 | * Only used by the unit driver upon unit removal to disconnect and | |
1895 | * cleanup all attached ports | |
1896 | * | |
1897 | * The port reference is put by fwtty_cleanup (if a reference was | |
1898 | * ever taken). | |
1899 | */ | |
1900 | static void fwserial_close_port(struct fwtty_port *port) | |
1901 | { | |
1902 | struct tty_struct *tty; | |
1903 | ||
1904 | mutex_lock(&port->port.mutex); | |
1905 | tty = tty_port_tty_get(&port->port); | |
1906 | if (tty) { | |
1907 | tty_vhangup(tty); | |
1908 | tty_kref_put(tty); | |
1909 | } | |
1910 | mutex_unlock(&port->port.mutex); | |
1911 | ||
1912 | tty_unregister_device(fwtty_driver, port->index); | |
1913 | } | |
1914 | ||
1915 | /** | |
1916 | * fwserial_lookup - finds first fw_serial associated with card | |
1917 | * @card: fw_card to match | |
1918 | * | |
1919 | * NB: caller must be holding fwserial_list_mutex | |
1920 | */ | |
1921 | static struct fw_serial *fwserial_lookup(struct fw_card *card) | |
1922 | { | |
1923 | struct fw_serial *serial; | |
1924 | ||
1925 | list_for_each_entry(serial, &fwserial_list, list) { | |
1926 | if (card == serial->card) | |
1927 | return serial; | |
1928 | } | |
1929 | ||
1930 | return NULL; | |
1931 | } | |
1932 | ||
1933 | /** | |
1934 | * __fwserial_lookup_rcu - finds first fw_serial associated with card | |
1935 | * @card: fw_card to match | |
1936 | * | |
1937 | * NB: caller must be inside rcu_read_lock() section | |
1938 | */ | |
1939 | static struct fw_serial *__fwserial_lookup_rcu(struct fw_card *card) | |
1940 | { | |
1941 | struct fw_serial *serial; | |
1942 | ||
1943 | list_for_each_entry_rcu(serial, &fwserial_list, list) { | |
1944 | if (card == serial->card) | |
1945 | return serial; | |
1946 | } | |
1947 | ||
1948 | return NULL; | |
1949 | } | |
1950 | ||
1951 | /** | |
1952 | * __fwserial_peer_by_node_id - finds a peer matching the given generation + id | |
1953 | * | |
1954 | * If a matching peer could not be found for the specified generation/node id, | |
1955 | * this could be because: | |
1956 | * a) the generation has changed and one of the nodes hasn't updated yet | |
1957 | * b) the remote node has created its remote unit device before this | |
1958 | * local node has created its corresponding remote unit device | |
1959 | * In either case, the remote node should retry | |
1960 | * | |
1961 | * Note: caller must be in rcu_read_lock() section | |
1962 | */ | |
1963 | static struct fwtty_peer *__fwserial_peer_by_node_id(struct fw_card *card, | |
1964 | int generation, int id) | |
1965 | { | |
1966 | struct fw_serial *serial; | |
1967 | struct fwtty_peer *peer; | |
1968 | ||
1969 | serial = __fwserial_lookup_rcu(card); | |
1970 | if (!serial) { | |
1971 | /* | |
1972 | * Something is very wrong - there should be a matching | |
1973 | * fw_serial structure for every fw_card. Maybe the remote node | |
1974 | * has created its remote unit device before this driver has | |
1975 | * been probed for any unit devices... | |
1976 | */ | |
1977 | fwtty_err(card, "unknown card (guid %016llx)", | |
1978 | (unsigned long long) card->guid); | |
1979 | return NULL; | |
1980 | } | |
1981 | ||
1982 | list_for_each_entry_rcu(peer, &serial->peer_list, list) { | |
1983 | int g = peer->generation; | |
1984 | smp_rmb(); | |
1985 | if (generation == g && id == peer->node_id) | |
1986 | return peer; | |
1987 | } | |
1988 | ||
1989 | return NULL; | |
1990 | } | |
1991 | ||
1992 | #ifdef DEBUG | |
1993 | static void __dump_peer_list(struct fw_card *card) | |
1994 | { | |
1995 | struct fw_serial *serial; | |
1996 | struct fwtty_peer *peer; | |
1997 | ||
1998 | serial = __fwserial_lookup_rcu(card); | |
1999 | if (!serial) | |
2000 | return; | |
2001 | ||
2002 | list_for_each_entry_rcu(peer, &serial->peer_list, list) { | |
2003 | int g = peer->generation; | |
2004 | smp_rmb(); | |
2005 | fwtty_dbg(card, "peer(%d:%x) guid: %016llx\n", g, | |
2006 | peer->node_id, (unsigned long long) peer->guid); | |
2007 | } | |
2008 | } | |
2009 | #else | |
2010 | #define __dump_peer_list(s) | |
2011 | #endif | |
2012 | ||
2013 | static void fwserial_auto_connect(struct work_struct *work) | |
2014 | { | |
2015 | struct fwtty_peer *peer = to_peer(to_delayed_work(work), connect); | |
2016 | int err; | |
2017 | ||
2018 | err = fwserial_connect_peer(peer); | |
2019 | if (err == -EAGAIN && ++peer->connect_retries < MAX_CONNECT_RETRIES) | |
2020 | schedule_delayed_work(&peer->connect, CONNECT_RETRY_DELAY); | |
2021 | } | |
2022 | ||
2023 | /** | |
2024 | * fwserial_add_peer - add a newly probed 'serial' unit device as a 'peer' | |
2025 | * @serial: aggregate representing the specific fw_card to add the peer to | |
2026 | * @unit: 'peer' to create and add to peer_list of serial | |
2027 | * | |
2028 | * Adds a 'peer' (ie, a local or remote 'serial' unit device) to the list of | |
2029 | * peers for a specific fw_card. Optionally, auto-attach this peer to an | |
2030 | * available tty port. This function is called either directly or indirectly | |
2031 | * as a result of a 'serial' unit device being created & probed. | |
2032 | * | |
2033 | * Note: this function is serialized with fwserial_remove_peer() by the | |
2034 | * fwserial_list_mutex held in fwserial_probe(). | |
2035 | * | |
2036 | * A 1:1 correspondence between an fw_unit and an fwtty_peer is maintained | |
2037 | * via the dev_set_drvdata() for the device of the fw_unit. | |
2038 | */ | |
2039 | static int fwserial_add_peer(struct fw_serial *serial, struct fw_unit *unit) | |
2040 | { | |
2041 | struct device *dev = &unit->device; | |
2042 | struct fw_device *parent = fw_parent_device(unit); | |
2043 | struct fwtty_peer *peer; | |
2044 | struct fw_csr_iterator ci; | |
2045 | int key, val; | |
2046 | int generation; | |
2047 | ||
2048 | peer = kzalloc(sizeof(*peer), GFP_KERNEL); | |
2049 | if (!peer) | |
2050 | return -ENOMEM; | |
2051 | ||
2052 | peer_set_state(peer, FWPS_NOT_ATTACHED); | |
2053 | ||
2054 | dev_set_drvdata(dev, peer); | |
2055 | peer->unit = unit; | |
2056 | peer->guid = (u64)parent->config_rom[3] << 32 | parent->config_rom[4]; | |
2057 | peer->speed = parent->max_speed; | |
2058 | peer->max_payload = min(device_max_receive(parent), | |
2059 | link_speed_to_max_payload(peer->speed)); | |
2060 | ||
2061 | generation = parent->generation; | |
2062 | smp_rmb(); | |
2063 | peer->node_id = parent->node_id; | |
2064 | smp_wmb(); | |
2065 | peer->generation = generation; | |
2066 | ||
2067 | /* retrieve the mgmt bus addr from the unit directory */ | |
2068 | fw_csr_iterator_init(&ci, unit->directory); | |
2069 | while (fw_csr_iterator_next(&ci, &key, &val)) { | |
2070 | if (key == (CSR_OFFSET | CSR_DEPENDENT_INFO)) { | |
2071 | peer->mgmt_addr = CSR_REGISTER_BASE + 4 * val; | |
2072 | break; | |
2073 | } | |
2074 | } | |
2075 | if (peer->mgmt_addr == 0ULL) { | |
2076 | /* | |
2077 | * No mgmt address effectively disables VIRT_CABLE_PLUG - | |
2078 | * this peer will not be able to attach to a remote | |
2079 | */ | |
2080 | peer_set_state(peer, FWPS_NO_MGMT_ADDR); | |
2081 | } | |
2082 | ||
2083 | spin_lock_init(&peer->lock); | |
2084 | peer->port = NULL; | |
2085 | ||
2086 | init_timer(&peer->timer); | |
2087 | INIT_WORK(&peer->work, NULL); | |
2088 | INIT_DELAYED_WORK(&peer->connect, fwserial_auto_connect); | |
2089 | ||
2090 | /* associate peer with specific fw_card */ | |
2091 | peer->serial = serial; | |
2092 | list_add_rcu(&peer->list, &serial->peer_list); | |
2093 | ||
2094 | fwtty_info(&peer->unit, "peer added (guid:%016llx)", | |
2095 | (unsigned long long)peer->guid); | |
2096 | ||
2097 | /* identify the local unit & virt cable to loopback port */ | |
2098 | if (parent->is_local) { | |
2099 | serial->self = peer; | |
2100 | if (create_loop_dev) { | |
2101 | struct fwtty_port *port; | |
2102 | port = fwserial_claim_port(peer, num_ttys); | |
2103 | if (!IS_ERR(port)) { | |
2104 | struct virt_plug_params params; | |
2105 | ||
2106 | spin_lock_bh(&peer->lock); | |
2107 | peer->port = port; | |
2108 | fill_plug_params(¶ms, port); | |
2109 | fwserial_virt_plug_complete(peer, ¶ms); | |
2110 | spin_unlock_bh(&peer->lock); | |
2111 | ||
2112 | fwtty_write_port_status(port); | |
2113 | } | |
2114 | } | |
2115 | ||
2116 | } else if (auto_connect) { | |
2117 | /* auto-attach to remote units only (if policy allows) */ | |
2118 | schedule_delayed_work(&peer->connect, 1); | |
2119 | } | |
2120 | ||
2121 | return 0; | |
2122 | } | |
2123 | ||
2124 | /** | |
2125 | * fwserial_remove_peer - remove a 'serial' unit device as a 'peer' | |
2126 | * | |
2127 | * Remove a 'peer' from its list of peers. This function is only | |
2128 | * called by fwserial_remove() on bus removal of the unit device. | |
2129 | * | |
2130 | * Note: this function is serialized with fwserial_add_peer() by the | |
2131 | * fwserial_list_mutex held in fwserial_remove(). | |
2132 | */ | |
2133 | static void fwserial_remove_peer(struct fwtty_peer *peer) | |
2134 | { | |
2135 | struct fwtty_port *port; | |
2136 | ||
2137 | spin_lock_bh(&peer->lock); | |
2138 | peer_set_state(peer, FWPS_GONE); | |
2139 | spin_unlock_bh(&peer->lock); | |
2140 | ||
2141 | cancel_delayed_work_sync(&peer->connect); | |
2142 | cancel_work_sync(&peer->work); | |
2143 | ||
2144 | spin_lock_bh(&peer->lock); | |
2145 | /* if this unit is the local unit, clear link */ | |
2146 | if (peer == peer->serial->self) | |
2147 | peer->serial->self = NULL; | |
2148 | ||
2149 | /* cancel the request timeout timer (if running) */ | |
2150 | del_timer(&peer->timer); | |
2151 | ||
2152 | port = peer->port; | |
2153 | peer->port = NULL; | |
2154 | ||
2155 | list_del_rcu(&peer->list); | |
2156 | ||
2157 | fwtty_info(&peer->unit, "peer removed (guid:%016llx)", | |
2158 | (unsigned long long)peer->guid); | |
2159 | ||
2160 | spin_unlock_bh(&peer->lock); | |
2161 | ||
2162 | if (port) | |
2163 | fwserial_release_port(port); | |
2164 | ||
2165 | synchronize_rcu(); | |
2166 | kfree(peer); | |
2167 | } | |
2168 | ||
2169 | /** | |
2170 | * create_loop_device - create a loopback tty device | |
2171 | * @tty_driver: tty_driver to own loopback device | |
2172 | * @prototype: ptr to already-assigned 'prototype' tty port | |
2173 | * @index: index to associate this device with the tty port | |
2174 | * @parent: device to child to | |
2175 | * | |
2176 | * HACK - this is basically tty_port_register_device() with an | |
2177 | * alternate naming scheme. Suggest tty_port_register_named_device() | |
2178 | * helper api. | |
2179 | * | |
2180 | * Creates a loopback tty device named 'fwloop<n>' which is attached to | |
2181 | * the local unit in fwserial_add_peer(). Note that <n> in the device | |
2182 | * name advances in increments of port allocation blocks, ie., for port | |
2183 | * indices 0..3, the device name will be 'fwloop0'; for 4..7, 'fwloop1', | |
2184 | * and so on. | |
2185 | * | |
2186 | * Only one loopback device should be created per fw_card. | |
2187 | */ | |
2188 | static void release_loop_device(struct device *dev) | |
2189 | { | |
2190 | kfree(dev); | |
2191 | } | |
2192 | ||
2193 | static struct device *create_loop_device(struct tty_driver *driver, | |
2194 | struct fwtty_port *prototype, | |
2195 | struct fwtty_port *port, | |
2196 | struct device *parent) | |
2197 | { | |
2198 | char name[64]; | |
2199 | int index = port->index; | |
2200 | dev_t devt = MKDEV(driver->major, driver->minor_start) + index; | |
2201 | struct device *dev = NULL; | |
2202 | int err; | |
2203 | ||
2204 | if (index >= fwtty_driver->num) | |
2205 | return ERR_PTR(-EINVAL); | |
2206 | ||
2207 | snprintf(name, 64, "%s%d", loop_dev_name, index / num_ports); | |
2208 | ||
2209 | tty_port_link_device(&port->port, driver, index); | |
2210 | ||
2211 | cdev_init(&driver->cdevs[index], driver->cdevs[prototype->index].ops); | |
2212 | driver->cdevs[index].owner = driver->owner; | |
2213 | err = cdev_add(&driver->cdevs[index], devt, 1); | |
2214 | if (err) | |
2215 | return ERR_PTR(err); | |
2216 | ||
2217 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2218 | if (!dev) { | |
2219 | cdev_del(&driver->cdevs[index]); | |
2220 | return ERR_PTR(-ENOMEM); | |
2221 | } | |
2222 | ||
2223 | dev->devt = devt; | |
2224 | dev->class = prototype->device->class; | |
2225 | dev->parent = parent; | |
2226 | dev->release = release_loop_device; | |
2227 | dev_set_name(dev, "%s", name); | |
2228 | dev->groups = NULL; | |
2229 | dev_set_drvdata(dev, NULL); | |
2230 | ||
2231 | err = device_register(dev); | |
2232 | if (err) { | |
2233 | put_device(dev); | |
2234 | cdev_del(&driver->cdevs[index]); | |
2235 | return ERR_PTR(err); | |
2236 | } | |
2237 | ||
2238 | return dev; | |
2239 | } | |
2240 | ||
2241 | /** | |
2242 | * fwserial_create - init everything to create TTYs for a specific fw_card | |
2243 | * @unit: fw_unit for first 'serial' unit device probed for this fw_card | |
2244 | * | |
2245 | * This function inits the aggregate structure (an fw_serial instance) | |
2246 | * used to manage the TTY ports registered by a specific fw_card. Also, the | |
2247 | * unit device is added as the first 'peer'. | |
2248 | * | |
2249 | * This unit device may represent a local unit device (as specified by the | |
2250 | * config ROM unit directory) or it may represent a remote unit device | |
2251 | * (as specified by the reading of the remote node's config ROM). | |
2252 | * | |
2253 | * Returns 0 to indicate "ownership" of the unit device, or a negative errno | |
2254 | * value to indicate which error. | |
2255 | */ | |
2256 | static int fwserial_create(struct fw_unit *unit) | |
2257 | { | |
2258 | struct fw_device *parent = fw_parent_device(unit); | |
2259 | struct fw_card *card = parent->card; | |
2260 | struct fw_serial *serial; | |
2261 | struct fwtty_port *port; | |
2262 | struct device *tty_dev; | |
2263 | int i, j; | |
2264 | int err; | |
2265 | ||
2266 | serial = kzalloc(sizeof(*serial), GFP_KERNEL); | |
2267 | if (!serial) | |
2268 | return -ENOMEM; | |
2269 | ||
2270 | kref_init(&serial->kref); | |
2271 | serial->card = card; | |
2272 | INIT_LIST_HEAD(&serial->peer_list); | |
2273 | ||
2274 | for (i = 0; i < num_ports; ++i) { | |
2275 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
2276 | if (!port) { | |
2277 | err = -ENOMEM; | |
2278 | goto free_ports; | |
2279 | } | |
2280 | tty_port_init(&port->port); | |
2281 | port->index = FWTTY_INVALID_INDEX; | |
2282 | port->port.ops = &fwtty_port_ops; | |
2283 | port->serial = serial; | |
2284 | ||
2285 | spin_lock_init(&port->lock); | |
2286 | INIT_DELAYED_WORK(&port->drain, fwtty_drain_tx); | |
2287 | INIT_DELAYED_WORK(&port->emit_breaks, fwtty_emit_breaks); | |
2288 | INIT_WORK(&port->hangup, fwtty_do_hangup); | |
2289 | INIT_WORK(&port->push, fwtty_pushrx); | |
2290 | INIT_LIST_HEAD(&port->buf_list); | |
2291 | init_waitqueue_head(&port->wait_tx); | |
2292 | port->max_payload = link_speed_to_max_payload(SCODE_100); | |
2293 | dma_fifo_init(&port->tx_fifo); | |
2294 | ||
2295 | rcu_assign_pointer(port->peer, NULL); | |
2296 | serial->ports[i] = port; | |
2297 | ||
2298 | /* get unique bus addr region for port's status & recv fifo */ | |
2299 | port->rx_handler.length = FWTTY_PORT_RXFIFO_LEN + 4; | |
2300 | port->rx_handler.address_callback = fwtty_port_handler; | |
2301 | port->rx_handler.callback_data = port; | |
2302 | /* | |
2303 | * XXX: use custom memory region above cpu physical memory addrs | |
2304 | * this will ease porting to 64-bit firewire adapters | |
2305 | */ | |
2306 | err = fw_core_add_address_handler(&port->rx_handler, | |
2307 | &fw_high_memory_region); | |
2308 | if (err) { | |
2309 | kfree(port); | |
2310 | goto free_ports; | |
2311 | } | |
2312 | } | |
2313 | /* preserve i for error cleanup */ | |
2314 | ||
2315 | err = fwtty_ports_add(serial); | |
2316 | if (err) { | |
2317 | fwtty_err(&unit, "no space in port table"); | |
2318 | goto free_ports; | |
2319 | } | |
2320 | ||
2321 | for (j = 0; j < num_ttys; ++j) { | |
2322 | tty_dev = tty_port_register_device(&serial->ports[j]->port, | |
2323 | fwtty_driver, | |
2324 | serial->ports[j]->index, | |
2325 | card->device); | |
2326 | if (IS_ERR(tty_dev)) { | |
2327 | err = PTR_ERR(tty_dev); | |
2328 | fwtty_err(&unit, "register tty device error (%d)", err); | |
2329 | goto unregister_ttys; | |
2330 | } | |
2331 | ||
2332 | serial->ports[j]->device = tty_dev; | |
2333 | } | |
2334 | /* preserve j for error cleanup */ | |
2335 | ||
2336 | if (create_loop_dev) { | |
2337 | struct device *loop_dev; | |
2338 | ||
2339 | loop_dev = create_loop_device(fwtty_driver, | |
2340 | serial->ports[0], | |
2341 | serial->ports[num_ttys], | |
2342 | card->device); | |
2343 | if (IS_ERR(loop_dev)) { | |
2344 | err = PTR_ERR(loop_dev); | |
2345 | fwtty_err(&unit, "create loop device failed (%d)", err); | |
2346 | goto unregister_ttys; | |
2347 | } | |
2348 | serial->ports[num_ttys]->device = loop_dev; | |
2349 | serial->ports[num_ttys]->loopback = true; | |
2350 | } | |
2351 | ||
2352 | list_add_rcu(&serial->list, &fwserial_list); | |
2353 | ||
2354 | fwtty_notice(&unit, "TTY over FireWire on device %s (guid %016llx)", | |
2355 | dev_name(card->device), (unsigned long long) card->guid); | |
2356 | ||
2357 | err = fwserial_add_peer(serial, unit); | |
2358 | if (!err) | |
2359 | return 0; | |
2360 | ||
2361 | fwtty_err(&unit, "unable to add peer unit device (%d)", err); | |
2362 | ||
2363 | /* fall-through to error processing */ | |
2364 | list_del_rcu(&serial->list); | |
2365 | unregister_ttys: | |
2366 | for (--j; j >= 0; --j) | |
2367 | tty_unregister_device(fwtty_driver, serial->ports[j]->index); | |
2368 | kref_put(&serial->kref, fwserial_destroy); | |
2369 | return err; | |
2370 | ||
2371 | free_ports: | |
2372 | for (--i; i >= 0; --i) | |
2373 | kfree(serial->ports[i]); | |
2374 | kfree(serial); | |
2375 | return err; | |
2376 | } | |
2377 | ||
2378 | /** | |
2379 | * fwserial_probe: bus probe function for firewire 'serial' unit devices | |
2380 | * | |
2381 | * A 'serial' unit device is created and probed as a result of: | |
2382 | * - declaring a ieee1394 bus id table for 'devices' matching a fabricated | |
2383 | * 'serial' unit specifier id | |
2384 | * - adding a unit directory to the config ROM(s) for a 'serial' unit | |
2385 | * | |
2386 | * The firewire core registers unit devices by enumerating unit directories | |
2387 | * of a node's config ROM after reading the config ROM when a new node is | |
2388 | * added to the bus topology after a bus reset. | |
2389 | * | |
2390 | * The practical implications of this are: | |
2391 | * - this probe is called for both local and remote nodes that have a 'serial' | |
2392 | * unit directory in their config ROM (that matches the specifiers in | |
2393 | * fwserial_id_table). | |
2394 | * - no specific order is enforced for local vs. remote unit devices | |
2395 | * | |
2396 | * This unit driver copes with the lack of specific order in the same way the | |
2397 | * firewire net driver does -- each probe, for either a local or remote unit | |
2398 | * device, is treated as a 'peer' (has a struct fwtty_peer instance) and the | |
2399 | * first peer created for a given fw_card (tracked by the global fwserial_list) | |
2400 | * creates the underlying TTYs (aggregated in a fw_serial instance). | |
2401 | * | |
2402 | * NB: an early attempt to differentiate local & remote unit devices by creating | |
2403 | * peers only for remote units and fw_serial instances (with their | |
2404 | * associated TTY devices) only for local units was discarded. Managing | |
2405 | * the peer lifetimes on device removal proved too complicated. | |
2406 | * | |
2407 | * fwserial_probe/fwserial_remove are effectively serialized by the | |
2408 | * fwserial_list_mutex. This is necessary because the addition of the first peer | |
2409 | * for a given fw_card will trigger the creation of the fw_serial for that | |
2410 | * fw_card, which must not simultaneously contend with the removal of the | |
2411 | * last peer for a given fw_card triggering the destruction of the same | |
2412 | * fw_serial for the same fw_card. | |
2413 | */ | |
2414 | static int fwserial_probe(struct device *dev) | |
2415 | { | |
2416 | struct fw_unit *unit = fw_unit(dev); | |
2417 | struct fw_serial *serial; | |
2418 | int err; | |
2419 | ||
2420 | mutex_lock(&fwserial_list_mutex); | |
2421 | serial = fwserial_lookup(fw_parent_device(unit)->card); | |
2422 | if (!serial) | |
2423 | err = fwserial_create(unit); | |
2424 | else | |
2425 | err = fwserial_add_peer(serial, unit); | |
2426 | mutex_unlock(&fwserial_list_mutex); | |
2427 | return err; | |
2428 | } | |
2429 | ||
2430 | /** | |
2431 | * fwserial_remove: bus removal function for firewire 'serial' unit devices | |
2432 | * | |
2433 | * The corresponding 'peer' for this unit device is removed from the list of | |
2434 | * peers for the associated fw_serial (which has a 1:1 correspondence with a | |
2435 | * specific fw_card). If this is the last peer being removed, then trigger | |
2436 | * the destruction of the underlying TTYs. | |
2437 | */ | |
2438 | static int fwserial_remove(struct device *dev) | |
2439 | { | |
2440 | struct fwtty_peer *peer = dev_get_drvdata(dev); | |
2441 | struct fw_serial *serial = peer->serial; | |
2442 | int i; | |
2443 | ||
2444 | mutex_lock(&fwserial_list_mutex); | |
2445 | fwserial_remove_peer(peer); | |
2446 | ||
2447 | if (list_empty(&serial->peer_list)) { | |
2448 | /* unlink from the fwserial_list here */ | |
2449 | list_del_rcu(&serial->list); | |
2450 | ||
2451 | for (i = 0; i < num_ports; ++i) | |
2452 | fwserial_close_port(serial->ports[i]); | |
2453 | kref_put(&serial->kref, fwserial_destroy); | |
2454 | } | |
2455 | mutex_unlock(&fwserial_list_mutex); | |
2456 | ||
2457 | return 0; | |
2458 | } | |
2459 | ||
2460 | /** | |
2461 | * fwserial_update: bus update function for 'firewire' serial unit devices | |
2462 | * | |
2463 | * Updates the new node_id and bus generation for this peer. Note that locking | |
2464 | * is unnecessary; but careful memory barrier usage is important to enforce the | |
2465 | * load and store order of generation & node_id. | |
2466 | * | |
2467 | * The fw-core orders the write of node_id before generation in the parent | |
2468 | * fw_device to ensure that a stale node_id cannot be used with a current | |
2469 | * bus generation. So the generation value must be read before the node_id. | |
2470 | * | |
2471 | * In turn, this orders the write of node_id before generation in the peer to | |
2472 | * also ensure a stale node_id cannot be used with a current bus generation. | |
2473 | */ | |
2474 | static void fwserial_update(struct fw_unit *unit) | |
2475 | { | |
2476 | struct fw_device *parent = fw_parent_device(unit); | |
2477 | struct fwtty_peer *peer = dev_get_drvdata(&unit->device); | |
2478 | int generation; | |
2479 | ||
2480 | generation = parent->generation; | |
2481 | smp_rmb(); | |
2482 | peer->node_id = parent->node_id; | |
2483 | smp_wmb(); | |
2484 | peer->generation = generation; | |
2485 | } | |
2486 | ||
2487 | static const struct ieee1394_device_id fwserial_id_table[] = { | |
2488 | { | |
2489 | .match_flags = IEEE1394_MATCH_SPECIFIER_ID | | |
2490 | IEEE1394_MATCH_VERSION, | |
2491 | .specifier_id = LINUX_VENDOR_ID, | |
2492 | .version = FWSERIAL_VERSION, | |
2493 | }, | |
2494 | { } | |
2495 | }; | |
2496 | ||
2497 | static struct fw_driver fwserial_driver = { | |
2498 | .driver = { | |
2499 | .owner = THIS_MODULE, | |
2500 | .name = KBUILD_MODNAME, | |
2501 | .bus = &fw_bus_type, | |
2502 | .probe = fwserial_probe, | |
2503 | .remove = fwserial_remove, | |
2504 | }, | |
2505 | .update = fwserial_update, | |
2506 | .id_table = fwserial_id_table, | |
2507 | }; | |
2508 | ||
2509 | #define FW_UNIT_SPECIFIER(id) ((CSR_SPECIFIER_ID << 24) | (id)) | |
2510 | #define FW_UNIT_VERSION(ver) ((CSR_VERSION << 24) | (ver)) | |
2511 | #define FW_UNIT_ADDRESS(ofs) (((CSR_OFFSET | CSR_DEPENDENT_INFO) << 24) \ | |
2512 | | (((ofs) - CSR_REGISTER_BASE) >> 2)) | |
2513 | /* XXX: config ROM definitons could be improved with semi-automated offset | |
2514 | * and length calculation | |
2515 | */ | |
2516 | #define FW_ROM_DESCRIPTOR(ofs) (((CSR_LEAF | CSR_DESCRIPTOR) << 24) | (ofs)) | |
2517 | ||
2518 | struct fwserial_unit_directory_data { | |
2519 | u16 crc; | |
2520 | u16 len; | |
2521 | u32 unit_specifier; | |
2522 | u32 unit_sw_version; | |
2523 | u32 unit_addr_offset; | |
2524 | u32 desc1_ofs; | |
2525 | u16 desc1_crc; | |
2526 | u16 desc1_len; | |
2527 | u32 desc1_data[5]; | |
2528 | } __packed; | |
2529 | ||
2530 | static struct fwserial_unit_directory_data fwserial_unit_directory_data = { | |
2531 | .len = 4, | |
2532 | .unit_specifier = FW_UNIT_SPECIFIER(LINUX_VENDOR_ID), | |
2533 | .unit_sw_version = FW_UNIT_VERSION(FWSERIAL_VERSION), | |
2534 | .desc1_ofs = FW_ROM_DESCRIPTOR(1), | |
2535 | .desc1_len = 5, | |
2536 | .desc1_data = { | |
2537 | 0x00000000, /* type = text */ | |
2538 | 0x00000000, /* enc = ASCII, lang EN */ | |
2539 | 0x4c696e75, /* 'Linux TTY' */ | |
2540 | 0x78205454, | |
2541 | 0x59000000, | |
2542 | }, | |
2543 | }; | |
2544 | ||
2545 | static struct fw_descriptor fwserial_unit_directory = { | |
2546 | .length = sizeof(fwserial_unit_directory_data) / sizeof(u32), | |
2547 | .key = (CSR_DIRECTORY | CSR_UNIT) << 24, | |
2548 | .data = (u32 *)&fwserial_unit_directory_data, | |
2549 | }; | |
2550 | ||
2551 | /* | |
2552 | * The management address is in the unit space region but above other known | |
2553 | * address users (to keep wild writes from causing havoc) | |
2554 | */ | |
2555 | const struct fw_address_region fwserial_mgmt_addr_region = { | |
2556 | .start = CSR_REGISTER_BASE + 0x1e0000ULL, | |
2557 | .end = 0x1000000000000ULL, | |
2558 | }; | |
2559 | ||
2560 | static struct fw_address_handler fwserial_mgmt_addr_handler; | |
2561 | ||
2562 | /** | |
2563 | * fwserial_handle_plug_req - handle VIRT_CABLE_PLUG request work | |
2564 | * @work: ptr to peer->work | |
2565 | * | |
2566 | * Attempts to complete the VIRT_CABLE_PLUG handshake sequence for this peer. | |
2567 | * | |
2568 | * This checks for a collided request-- ie, that a VIRT_CABLE_PLUG request was | |
2569 | * already sent to this peer. If so, the collision is resolved by comparing | |
2570 | * guid values; the loser sends the plug response. | |
2571 | * | |
2572 | * Note: if an error prevents a response, don't do anything -- the | |
2573 | * remote will timeout its request. | |
2574 | */ | |
2575 | static void fwserial_handle_plug_req(struct work_struct *work) | |
2576 | { | |
2577 | struct fwtty_peer *peer = to_peer(work, work); | |
2578 | struct virt_plug_params *plug_req = &peer->work_params.plug_req; | |
2579 | struct fwtty_port *port; | |
2580 | struct fwserial_mgmt_pkt *pkt; | |
2581 | int rcode; | |
2582 | ||
2583 | pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); | |
2584 | if (!pkt) | |
2585 | return; | |
2586 | ||
2587 | port = fwserial_find_port(peer); | |
2588 | ||
2589 | spin_lock_bh(&peer->lock); | |
2590 | ||
2591 | switch (peer->state) { | |
2592 | case FWPS_NOT_ATTACHED: | |
2593 | if (!port) { | |
2594 | fwtty_err(&peer->unit, "no more ports avail"); | |
2595 | fill_plug_rsp_nack(pkt); | |
2596 | } else { | |
2597 | peer->port = port; | |
2598 | fill_plug_rsp_ok(pkt, peer->port); | |
2599 | peer_set_state(peer, FWPS_PLUG_RESPONDING); | |
2600 | /* don't release claimed port */ | |
2601 | port = NULL; | |
2602 | } | |
2603 | break; | |
2604 | ||
2605 | case FWPS_PLUG_PENDING: | |
2606 | if (peer->serial->card->guid > peer->guid) | |
2607 | goto cleanup; | |
2608 | ||
2609 | /* We lost - hijack the already-claimed port and send ok */ | |
2610 | del_timer(&peer->timer); | |
2611 | fill_plug_rsp_ok(pkt, peer->port); | |
2612 | peer_set_state(peer, FWPS_PLUG_RESPONDING); | |
2613 | break; | |
2614 | ||
2615 | default: | |
2616 | fill_plug_rsp_nack(pkt); | |
2617 | } | |
2618 | ||
2619 | spin_unlock_bh(&peer->lock); | |
2620 | if (port) | |
2621 | fwserial_release_port(port); | |
2622 | ||
2623 | rcode = fwserial_send_mgmt_sync(peer, pkt); | |
2624 | ||
2625 | spin_lock_bh(&peer->lock); | |
2626 | if (peer->state == FWPS_PLUG_RESPONDING) { | |
2627 | if (rcode == RCODE_COMPLETE) { | |
2628 | struct fwtty_port *tmp = peer->port; | |
2629 | ||
2630 | fwserial_virt_plug_complete(peer, plug_req); | |
2631 | spin_unlock_bh(&peer->lock); | |
2632 | ||
2633 | fwtty_write_port_status(tmp); | |
2634 | spin_lock_bh(&peer->lock); | |
2635 | } else { | |
2636 | fwtty_err(&peer->unit, "PLUG_RSP error (%d)", rcode); | |
2637 | port = peer_revert_state(peer); | |
2638 | } | |
2639 | } | |
2640 | cleanup: | |
2641 | spin_unlock_bh(&peer->lock); | |
2642 | if (port) | |
2643 | fwserial_release_port(port); | |
2644 | kfree(pkt); | |
2645 | return; | |
2646 | } | |
2647 | ||
2648 | static void fwserial_handle_unplug_req(struct work_struct *work) | |
2649 | { | |
2650 | struct fwtty_peer *peer = to_peer(work, work); | |
2651 | struct fwtty_port *port = NULL; | |
2652 | struct fwserial_mgmt_pkt *pkt; | |
2653 | int rcode; | |
2654 | ||
2655 | pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); | |
2656 | if (!pkt) | |
2657 | return; | |
2658 | ||
2659 | spin_lock_bh(&peer->lock); | |
2660 | ||
2661 | switch (peer->state) { | |
2662 | case FWPS_ATTACHED: | |
2663 | fill_unplug_rsp_ok(pkt); | |
2664 | peer_set_state(peer, FWPS_UNPLUG_RESPONDING); | |
2665 | break; | |
2666 | ||
2667 | case FWPS_UNPLUG_PENDING: | |
2668 | if (peer->serial->card->guid > peer->guid) | |
2669 | goto cleanup; | |
2670 | ||
2671 | /* We lost - send unplug rsp */ | |
2672 | del_timer(&peer->timer); | |
2673 | fill_unplug_rsp_ok(pkt); | |
2674 | peer_set_state(peer, FWPS_UNPLUG_RESPONDING); | |
2675 | break; | |
2676 | ||
2677 | default: | |
2678 | fill_unplug_rsp_nack(pkt); | |
2679 | } | |
2680 | ||
2681 | spin_unlock_bh(&peer->lock); | |
2682 | ||
2683 | rcode = fwserial_send_mgmt_sync(peer, pkt); | |
2684 | ||
2685 | spin_lock_bh(&peer->lock); | |
2686 | if (peer->state == FWPS_UNPLUG_RESPONDING) { | |
2687 | if (rcode == RCODE_COMPLETE) | |
2688 | port = peer_revert_state(peer); | |
2689 | else | |
2690 | fwtty_err(&peer->unit, "UNPLUG_RSP error (%d)", rcode); | |
2691 | } | |
2692 | cleanup: | |
2693 | spin_unlock_bh(&peer->lock); | |
2694 | if (port) | |
2695 | fwserial_release_port(port); | |
2696 | kfree(pkt); | |
2697 | return; | |
2698 | } | |
2699 | ||
2700 | static int fwserial_parse_mgmt_write(struct fwtty_peer *peer, | |
2701 | struct fwserial_mgmt_pkt *pkt, | |
2702 | unsigned long long addr, | |
2703 | size_t len) | |
2704 | { | |
2705 | struct fwtty_port *port = NULL; | |
2706 | int rcode; | |
2707 | ||
2708 | if (addr != fwserial_mgmt_addr_handler.offset || len < sizeof(pkt->hdr)) | |
2709 | return RCODE_ADDRESS_ERROR; | |
2710 | ||
2711 | if (len != be16_to_cpu(pkt->hdr.len) || | |
2712 | len != mgmt_pkt_expected_len(pkt->hdr.code)) | |
2713 | return RCODE_DATA_ERROR; | |
2714 | ||
2715 | spin_lock_bh(&peer->lock); | |
2716 | if (peer->state == FWPS_GONE) { | |
2717 | /* | |
2718 | * This should never happen - it would mean that the | |
2719 | * remote unit that just wrote this transaction was | |
2720 | * already removed from the bus -- and the removal was | |
2721 | * processed before we rec'd this transaction | |
2722 | */ | |
2723 | fwtty_err(&peer->unit, "peer already removed"); | |
2724 | spin_unlock_bh(&peer->lock); | |
2725 | return RCODE_ADDRESS_ERROR; | |
2726 | } | |
2727 | ||
2728 | rcode = RCODE_COMPLETE; | |
2729 | ||
2730 | fwtty_dbg(&peer->unit, "mgmt: hdr.code: %04hx", pkt->hdr.code); | |
2731 | ||
2732 | switch (be16_to_cpu(pkt->hdr.code) & FWSC_CODE_MASK) { | |
2733 | case FWSC_VIRT_CABLE_PLUG: | |
2734 | if (work_pending(&peer->work)) { | |
2735 | fwtty_err(&peer->unit, "plug req: busy"); | |
2736 | rcode = RCODE_CONFLICT_ERROR; | |
2737 | ||
2738 | } else { | |
2739 | peer->work_params.plug_req = pkt->plug_req; | |
2740 | PREPARE_WORK(&peer->work, fwserial_handle_plug_req); | |
2741 | queue_work(system_unbound_wq, &peer->work); | |
2742 | } | |
2743 | break; | |
2744 | ||
2745 | case FWSC_VIRT_CABLE_PLUG_RSP: | |
2746 | if (peer->state != FWPS_PLUG_PENDING) { | |
2747 | rcode = RCODE_CONFLICT_ERROR; | |
2748 | ||
2749 | } else if (be16_to_cpu(pkt->hdr.code) & FWSC_RSP_NACK) { | |
2750 | fwtty_notice(&peer->unit, "NACK plug rsp"); | |
2751 | port = peer_revert_state(peer); | |
2752 | ||
2753 | } else { | |
2754 | struct fwtty_port *tmp = peer->port; | |
2755 | ||
2756 | fwserial_virt_plug_complete(peer, &pkt->plug_rsp); | |
2757 | spin_unlock_bh(&peer->lock); | |
2758 | ||
2759 | fwtty_write_port_status(tmp); | |
2760 | spin_lock_bh(&peer->lock); | |
2761 | } | |
2762 | break; | |
2763 | ||
2764 | case FWSC_VIRT_CABLE_UNPLUG: | |
2765 | if (work_pending(&peer->work)) { | |
2766 | fwtty_err(&peer->unit, "unplug req: busy"); | |
2767 | rcode = RCODE_CONFLICT_ERROR; | |
2768 | } else { | |
2769 | PREPARE_WORK(&peer->work, fwserial_handle_unplug_req); | |
2770 | queue_work(system_unbound_wq, &peer->work); | |
2771 | } | |
2772 | break; | |
2773 | ||
2774 | case FWSC_VIRT_CABLE_UNPLUG_RSP: | |
2775 | if (peer->state != FWPS_UNPLUG_PENDING) | |
2776 | rcode = RCODE_CONFLICT_ERROR; | |
2777 | else { | |
2778 | if (be16_to_cpu(pkt->hdr.code) & FWSC_RSP_NACK) | |
2779 | fwtty_notice(&peer->unit, "NACK unplug?"); | |
2780 | port = peer_revert_state(peer); | |
2781 | } | |
2782 | break; | |
2783 | ||
2784 | default: | |
2785 | fwtty_err(&peer->unit, "unknown mgmt code %d", | |
2786 | be16_to_cpu(pkt->hdr.code)); | |
2787 | rcode = RCODE_DATA_ERROR; | |
2788 | } | |
2789 | spin_unlock_bh(&peer->lock); | |
2790 | ||
2791 | if (port) | |
2792 | fwserial_release_port(port); | |
2793 | ||
2794 | return rcode; | |
2795 | } | |
2796 | ||
2797 | /** | |
2798 | * fwserial_mgmt_handler: bus address handler for mgmt requests | |
2799 | * @parameters: fw_address_callback_t as specified by firewire core interface | |
2800 | * | |
2801 | * This handler is responsible for handling virtual cable requests from remotes | |
2802 | * for all cards. | |
2803 | */ | |
2804 | static void fwserial_mgmt_handler(struct fw_card *card, | |
2805 | struct fw_request *request, | |
2806 | int tcode, int destination, int source, | |
2807 | int generation, | |
2808 | unsigned long long addr, | |
2809 | void *data, size_t len, | |
2810 | void *callback_data) | |
2811 | { | |
2812 | struct fwserial_mgmt_pkt *pkt = data; | |
2813 | struct fwtty_peer *peer; | |
2814 | int rcode; | |
2815 | ||
2816 | rcu_read_lock(); | |
2817 | peer = __fwserial_peer_by_node_id(card, generation, source); | |
2818 | if (!peer) { | |
2819 | fwtty_dbg(card, "peer(%d:%x) not found", generation, source); | |
2820 | __dump_peer_list(card); | |
2821 | rcode = RCODE_CONFLICT_ERROR; | |
2822 | ||
2823 | } else { | |
2824 | switch (tcode) { | |
2825 | case TCODE_WRITE_BLOCK_REQUEST: | |
2826 | rcode = fwserial_parse_mgmt_write(peer, pkt, addr, len); | |
2827 | break; | |
2828 | ||
2829 | default: | |
2830 | rcode = RCODE_TYPE_ERROR; | |
2831 | } | |
2832 | } | |
2833 | ||
2834 | rcu_read_unlock(); | |
2835 | fw_send_response(card, request, rcode); | |
2836 | } | |
2837 | ||
2838 | static int __init fwserial_init(void) | |
2839 | { | |
2840 | int err, num_loops = !!(create_loop_dev); | |
2841 | ||
2842 | /* num_ttys/num_ports must not be set above the static alloc avail */ | |
2843 | if (num_ttys + num_loops > MAX_CARD_PORTS) | |
2844 | num_ttys = MAX_CARD_PORTS - num_loops; | |
2845 | num_ports = num_ttys + num_loops; | |
2846 | ||
2847 | fwtty_driver = alloc_tty_driver(MAX_TOTAL_PORTS); | |
2848 | if (!fwtty_driver) { | |
2849 | err = -ENOMEM; | |
2850 | return err; | |
2851 | } | |
2852 | ||
2853 | fwtty_driver->driver_name = KBUILD_MODNAME; | |
2854 | fwtty_driver->name = tty_dev_name; | |
2855 | fwtty_driver->major = 0; | |
2856 | fwtty_driver->minor_start = 0; | |
2857 | fwtty_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
2858 | fwtty_driver->subtype = SERIAL_TYPE_NORMAL; | |
2859 | fwtty_driver->flags = TTY_DRIVER_REAL_RAW | | |
2860 | TTY_DRIVER_DYNAMIC_DEV; | |
2861 | ||
2862 | fwtty_driver->init_termios = tty_std_termios; | |
2863 | fwtty_driver->init_termios.c_cflag |= CLOCAL; | |
2864 | tty_set_operations(fwtty_driver, &fwtty_ops); | |
2865 | ||
2866 | err = tty_register_driver(fwtty_driver); | |
2867 | if (err) { | |
2868 | driver_err("register tty driver failed (%d)", err); | |
2869 | goto put_tty; | |
2870 | } | |
2871 | ||
2872 | fwtty_txn_cache = kmem_cache_create("fwtty_txn_cache", | |
2873 | sizeof(struct fwtty_transaction), | |
2874 | 0, 0, fwtty_txn_constructor); | |
2875 | if (!fwtty_txn_cache) { | |
2876 | err = -ENOMEM; | |
2877 | goto unregister_driver; | |
2878 | } | |
2879 | ||
2880 | /* | |
2881 | * Ideally, this address handler would be registered per local node | |
2882 | * (rather than the same handler for all local nodes). However, | |
2883 | * since the firewire core requires the config rom descriptor *before* | |
2884 | * the local unit device(s) are created, a single management handler | |
2885 | * must suffice for all local serial units. | |
2886 | */ | |
2887 | fwserial_mgmt_addr_handler.length = sizeof(struct fwserial_mgmt_pkt); | |
2888 | fwserial_mgmt_addr_handler.address_callback = fwserial_mgmt_handler; | |
2889 | ||
2890 | err = fw_core_add_address_handler(&fwserial_mgmt_addr_handler, | |
2891 | &fwserial_mgmt_addr_region); | |
2892 | if (err) { | |
2893 | driver_err("add management handler failed (%d)", err); | |
2894 | goto destroy_cache; | |
2895 | } | |
2896 | ||
2897 | fwserial_unit_directory_data.unit_addr_offset = | |
2898 | FW_UNIT_ADDRESS(fwserial_mgmt_addr_handler.offset); | |
2899 | err = fw_core_add_descriptor(&fwserial_unit_directory); | |
2900 | if (err) { | |
2901 | driver_err("add unit descriptor failed (%d)", err); | |
2902 | goto remove_handler; | |
2903 | } | |
2904 | ||
2905 | err = driver_register(&fwserial_driver.driver); | |
2906 | if (err) { | |
2907 | driver_err("register fwserial driver failed (%d)", err); | |
2908 | goto remove_descriptor; | |
2909 | } | |
2910 | ||
2911 | return 0; | |
2912 | ||
2913 | remove_descriptor: | |
2914 | fw_core_remove_descriptor(&fwserial_unit_directory); | |
2915 | remove_handler: | |
2916 | fw_core_remove_address_handler(&fwserial_mgmt_addr_handler); | |
2917 | destroy_cache: | |
2918 | kmem_cache_destroy(fwtty_txn_cache); | |
2919 | unregister_driver: | |
2920 | tty_unregister_driver(fwtty_driver); | |
2921 | put_tty: | |
2922 | put_tty_driver(fwtty_driver); | |
2923 | return err; | |
2924 | } | |
2925 | ||
2926 | static void __exit fwserial_exit(void) | |
2927 | { | |
2928 | driver_unregister(&fwserial_driver.driver); | |
2929 | fw_core_remove_descriptor(&fwserial_unit_directory); | |
2930 | fw_core_remove_address_handler(&fwserial_mgmt_addr_handler); | |
2931 | kmem_cache_destroy(fwtty_txn_cache); | |
2932 | tty_unregister_driver(fwtty_driver); | |
2933 | put_tty_driver(fwtty_driver); | |
2934 | } | |
2935 | ||
2936 | module_init(fwserial_init); | |
2937 | module_exit(fwserial_exit); | |
2938 | ||
2939 | MODULE_AUTHOR("Peter Hurley (peter@hurleysoftware.com)"); | |
2940 | MODULE_DESCRIPTION("FireWire Serial TTY Driver"); | |
2941 | MODULE_LICENSE("GPL"); | |
2942 | MODULE_DEVICE_TABLE(ieee1394, fwserial_id_table); | |
2943 | MODULE_PARM_DESC(ttys, "Number of ttys to create for each local firewire node"); | |
2944 | MODULE_PARM_DESC(auto, "Auto-connect a tty to each firewire node discovered"); | |
2945 | MODULE_PARM_DESC(loop, "Create a loopback device, fwloop<n>, with ttys"); | |
2946 | MODULE_PARM_DESC(limit_bw, "Limit bandwidth utilization to 20%."); |