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800f879a AT |
1 | /* |
2 | * Copyright 2010-2017 Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * Disclaimer: The codes contained in these modules may be specific to | |
14 | * the Intel Software Development Platform codenamed Knights Ferry, | |
15 | * and the Intel product codenamed Knights Corner, and are not backward | |
16 | * compatible with other Intel products. Additionally, Intel will NOT | |
17 | * support the codes or instruction set in future products. | |
18 | * | |
19 | * Intel offers no warranty of any kind regarding the code. This code is | |
20 | * licensed on an "AS IS" basis and Intel is not obligated to provide | |
21 | * any support, assistance, installation, training, or other services | |
22 | * of any kind. Intel is also not obligated to provide any updates, | |
23 | * enhancements or extensions. Intel specifically disclaims any warranty | |
24 | * of merchantability, non-infringement, fitness for any particular | |
25 | * purpose, and any other warranty. | |
26 | * | |
27 | * Further, Intel disclaims all liability of any kind, including but | |
28 | * not limited to liability for infringement of any proprietary rights, | |
29 | * relating to the use of the code, even if Intel is notified of the | |
30 | * possibility of such liability. Except as expressly stated in an Intel | |
31 | * license agreement provided with this code and agreed upon with Intel, | |
32 | * no license, express or implied, by estoppel or otherwise, to any | |
33 | * intellectual property rights is granted herein. | |
34 | */ | |
35 | ||
36 | #include "micint.h" | |
37 | ||
38 | /* TODO: Improve debug messages */ | |
39 | ||
40 | static int micvcons_open(struct tty_struct * tty, struct file * filp); | |
41 | static void micvcons_close(struct tty_struct * tty, struct file * filp); | |
42 | static int micvcons_write(struct tty_struct * tty, const unsigned char *buf, | |
43 | int count); | |
44 | static int micvcons_write_room(struct tty_struct *tty); | |
45 | static void micvcons_set_termios(struct tty_struct *tty, struct ktermios * old); | |
f4a476d1 | 46 | static void micvcons_timeout(struct timer_list *); |
800f879a AT |
47 | static void micvcons_throttle(struct tty_struct *tty); |
48 | static void micvcons_unthrottle(struct tty_struct *tty); | |
49 | static void micvcons_wakeup_readbuf(struct work_struct *work); | |
50 | static int micvcons_resume(struct _mic_ctx_t *mic_ctx); | |
51 | ||
52 | static struct tty_operations micvcons_tty_ops = { | |
53 | .open = micvcons_open, | |
54 | .close = micvcons_close, | |
55 | .write = micvcons_write, | |
56 | .write_room = micvcons_write_room, | |
57 | .set_termios = micvcons_set_termios, | |
58 | .throttle = micvcons_throttle, | |
59 | .unthrottle = micvcons_unthrottle, | |
60 | }; | |
61 | ||
62 | static struct tty_driver *micvcons_tty = NULL; | |
63 | static u16 extra_timeout = 0; | |
64 | static u8 restart_timer_flag = MICVCONS_TIMER_RESTART; | |
800f879a AT |
65 | static spinlock_t timer_list_lock; |
66 | ||
f4a476d1 AT |
67 | // The timer API introduced in Linux 4.14.0 includes a from_timer() macro built |
68 | // atop the container_of() macro. As the kernel moves away from using | |
69 | // timer_list.data, it quasi-assumes that the timer_list struct will be | |
70 | // contained in some larger struct that also contains the data, hence this | |
71 | // timer_wrapper struct since it allows us to avoid any serious code changes to | |
72 | // the driver. | |
73 | static struct timer_wrapper { | |
74 | struct timer_list vcons_timer; | |
75 | struct list_head timer_list_head; | |
76 | } timer_wrapper ; | |
77 | ||
800f879a AT |
78 | int |
79 | micvcons_create(int num_bds) | |
80 | { | |
81 | micvcons_port_t *port; | |
82 | bd_info_t *bd_info; | |
83 | int bd, ret = 0; | |
84 | char wq_name[14]; | |
85 | struct device *dev; | |
86 | ||
f4a476d1 | 87 | INIT_LIST_HEAD(&timer_wrapper.timer_list_head); |
800f879a AT |
88 | |
89 | if (micvcons_tty) | |
90 | goto exit; | |
91 | ||
92 | micvcons_tty = alloc_tty_driver(num_bds); | |
93 | if (!micvcons_tty) { | |
94 | ret = -ENOMEM; | |
95 | goto exit; | |
96 | } | |
97 | micvcons_tty->owner = THIS_MODULE; | |
98 | micvcons_tty->driver_name = MICVCONS_DEVICE_NAME; | |
99 | micvcons_tty->name = MICVCONS_DEVICE_NAME; | |
100 | micvcons_tty->major = 0; | |
101 | #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)) | |
102 | micvcons_tty->minor_num = num_bds; | |
103 | #endif | |
104 | micvcons_tty->minor_start = 0; | |
105 | micvcons_tty->type = TTY_DRIVER_TYPE_SERIAL; | |
106 | micvcons_tty->subtype = SERIAL_TYPE_NORMAL; | |
107 | micvcons_tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
108 | micvcons_tty->init_termios = tty_std_termios; | |
109 | micvcons_tty->init_termios.c_iflag = IGNCR; | |
110 | micvcons_tty->init_termios.c_oflag = 0; | |
111 | micvcons_tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
112 | micvcons_tty->init_termios.c_lflag = 0; | |
113 | ||
114 | tty_set_operations(micvcons_tty, &micvcons_tty_ops); | |
115 | ||
116 | if ((ret = tty_register_driver(micvcons_tty)) != 0) { | |
117 | printk("Failed to register vcons tty driver\n"); | |
118 | put_tty_driver(micvcons_tty); | |
119 | micvcons_tty = NULL; | |
120 | goto exit; | |
121 | } | |
122 | ||
123 | for (bd = 0; bd < num_bds; bd++) { | |
124 | port = &mic_data.dd_ports[bd]; | |
125 | port->dp_bdinfo = mic_data.dd_bi[bd]; | |
126 | ||
127 | spin_lock_init(&port->dp_lock); | |
128 | mutex_init (&port->dp_mutex); | |
129 | ||
130 | bd_info = (bd_info_t *)port->dp_bdinfo; | |
131 | bd_info->bi_port = port; | |
132 | ||
133 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)) | |
134 | tty_port_init(&port->port); | |
135 | dev = tty_port_register_device(&port->port, micvcons_tty, bd, NULL); | |
136 | #else | |
137 | dev = tty_register_device(micvcons_tty, bd, NULL); | |
138 | if (IS_ERR(dev)) { | |
139 | printk("Failed to register vcons tty device\n"); | |
140 | micvcons_destroy(bd); | |
141 | ret = PTR_ERR(dev); | |
142 | goto exit; | |
143 | } | |
144 | #endif | |
145 | snprintf(wq_name, sizeof(wq_name), "VCONS MIC %d", bd); | |
146 | port->dp_wq = __mic_create_singlethread_workqueue(wq_name); | |
147 | if (!port->dp_wq) { | |
148 | printk(KERN_ERR "%s: create_singlethread_workqueue\n", | |
149 | __func__); | |
150 | tty_unregister_device(micvcons_tty, bd); | |
151 | micvcons_destroy(bd); | |
152 | ret = -ENOMEM; | |
153 | goto exit; | |
154 | } | |
155 | INIT_WORK(&port->dp_wakeup_read_buf, micvcons_wakeup_readbuf); | |
156 | } | |
f4a476d1 | 157 | timer_setup(&timer_wrapper.vcons_timer, micvcons_timeout, 0); |
800f879a AT |
158 | exit: |
159 | return ret; | |
160 | } | |
161 | ||
162 | void micvcons_destroy(int num_bds) | |
163 | { | |
164 | int bd, ret; | |
165 | micvcons_port_t *port; | |
166 | ||
167 | if (!micvcons_tty) | |
168 | return; | |
169 | for (bd = 0; bd < num_bds; bd++) { | |
170 | port = &mic_data.dd_ports[bd]; | |
171 | destroy_workqueue(port->dp_wq); | |
172 | tty_unregister_device(micvcons_tty, bd); | |
173 | } | |
174 | ret = tty_unregister_driver(micvcons_tty); | |
175 | put_tty_driver(micvcons_tty); | |
176 | micvcons_tty = NULL; | |
177 | ||
178 | if (ret) | |
179 | printk(KERN_ERR "tty unregister_driver failed with code %d\n", ret); | |
180 | } | |
181 | ||
182 | static int | |
183 | micvcons_open(struct tty_struct * tty, struct file * filp) | |
184 | { | |
185 | micvcons_port_t *port = &mic_data.dd_ports[tty->index]; | |
186 | int ret = 0; | |
187 | mic_ctx_t *mic_ctx = get_per_dev_ctx(tty->index); | |
188 | ||
189 | tty->driver_data = port; | |
190 | ||
191 | mutex_lock(&port->dp_mutex); | |
192 | spin_lock_bh(&port->dp_lock); | |
193 | ||
194 | if ((filp->f_flags & O_ACCMODE) != O_RDONLY) { | |
195 | if (port->dp_writer) { | |
196 | ret = -EBUSY; | |
197 | goto exit_locked; | |
198 | } | |
199 | port->dp_writer = filp; | |
200 | port->dp_bytes = 0; | |
201 | } | |
202 | ||
203 | if ((filp->f_flags & O_ACCMODE) != O_WRONLY) { | |
204 | if (port->dp_reader) { | |
205 | ret = -EBUSY; | |
206 | goto exit_locked; | |
207 | } | |
208 | port->dp_reader = filp; | |
209 | port->dp_canread = 1; | |
210 | } | |
211 | ||
212 | #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)) | |
213 | tty->low_latency = 0; | |
214 | #endif | |
215 | ||
216 | if (!port->dp_tty) | |
217 | port->dp_tty = tty; | |
218 | if (!port->dp_vcons) | |
219 | port->dp_vcons = &mic_ctx->bi_vcons; | |
220 | if (tty->count == 1) { | |
221 | ret = micvcons_start(mic_ctx); | |
222 | if (ret != 0) | |
223 | goto exit_locked; | |
224 | spin_lock(&timer_list_lock); | |
f4a476d1 AT |
225 | list_add_tail_rcu(&port->list_member, &timer_wrapper.timer_list_head); |
226 | if (list_is_singular(&timer_wrapper.timer_list_head)) { | |
800f879a | 227 | restart_timer_flag = MICVCONS_TIMER_RESTART; |
f4a476d1 | 228 | mod_timer(&timer_wrapper.vcons_timer, jiffies + |
800f879a AT |
229 | msecs_to_jiffies(MICVCONS_SHORT_TIMEOUT)); |
230 | } | |
231 | spin_unlock(&timer_list_lock); | |
232 | } | |
233 | ||
234 | exit_locked: | |
235 | spin_unlock_bh(&port->dp_lock); | |
236 | mutex_unlock(&port->dp_mutex); | |
237 | return ret; | |
238 | } | |
239 | ||
240 | static inline void | |
241 | micvcons_del_timer_entry(micvcons_port_t *port) | |
242 | { | |
243 | spin_lock(&timer_list_lock); | |
244 | list_del_rcu(&port->list_member); | |
f4a476d1 | 245 | if (list_empty(&timer_wrapper.timer_list_head)) { |
800f879a AT |
246 | restart_timer_flag = MICVCONS_TIMER_SHUTDOWN; |
247 | spin_unlock(&timer_list_lock); | |
f4a476d1 | 248 | del_timer_sync(&timer_wrapper.vcons_timer); |
800f879a AT |
249 | } else { |
250 | spin_unlock(&timer_list_lock); | |
251 | } | |
252 | synchronize_rcu(); | |
253 | } | |
254 | ||
255 | static void | |
256 | micvcons_close(struct tty_struct * tty, struct file * filp) | |
257 | { | |
258 | micvcons_port_t *port = (micvcons_port_t *)tty->driver_data; | |
259 | ||
260 | mutex_lock(&port->dp_mutex); | |
261 | if (tty->count == 1) { | |
262 | micvcons_del_timer_entry(port); | |
263 | flush_workqueue(port->dp_wq); | |
264 | } | |
265 | spin_lock_bh(&port->dp_lock); | |
266 | if (port->dp_reader == filp) | |
267 | port->dp_reader = 0; | |
268 | ||
269 | if (port->dp_writer == filp) | |
270 | port->dp_writer = 0; | |
271 | ||
272 | if (tty->count == 1) | |
273 | port->dp_tty = 0; | |
274 | spin_unlock_bh(&port->dp_lock); | |
275 | mutex_unlock(&port->dp_mutex); | |
276 | } | |
277 | ||
278 | static int | |
279 | micvcons_write(struct tty_struct * tty, const unsigned char *buf, int count) | |
280 | { | |
281 | micvcons_port_t *port = (micvcons_port_t *)tty->driver_data; | |
282 | mic_ctx_t *mic_ctx = get_per_dev_ctx(tty->index); | |
283 | int bytes=0, status; | |
284 | struct vcons_buf *vcons_host_header; | |
285 | u8 card_alive = 1; | |
286 | ||
287 | spin_lock_bh(&port->dp_lock); | |
288 | vcons_host_header = (struct vcons_buf *)port->dp_vcons->dc_hdr_virt; | |
289 | if (vcons_host_header->mic_magic == MIC_VCONS_SLEEPING) { | |
290 | status = micvcons_resume(mic_ctx); | |
291 | if (status != 0) { | |
292 | /* If card can not wakeup, it is dead. */ | |
293 | card_alive = 0; | |
294 | goto exit; | |
295 | } | |
296 | } | |
297 | if (vcons_host_header->mic_magic != MIC_VCONS_READY) | |
298 | goto exit; | |
299 | bytes = micvcons_port_write(port, buf, count); | |
300 | if (bytes) { | |
301 | mic_send_hvc_intr(mic_ctx); | |
302 | extra_timeout = 0; | |
303 | } | |
304 | exit: | |
305 | spin_unlock_bh(&port->dp_lock); | |
306 | if (!card_alive) | |
307 | micvcons_del_timer_entry(port); | |
308 | return bytes; | |
309 | } | |
310 | ||
311 | static int | |
312 | micvcons_write_room(struct tty_struct *tty) | |
313 | { | |
314 | micvcons_port_t *port = (micvcons_port_t *)tty->driver_data; | |
315 | int room; | |
316 | ||
317 | spin_lock_bh(&port->dp_lock); | |
318 | if (port->dp_out) | |
319 | room = micscif_rb_space(port->dp_out); | |
320 | else | |
321 | room = 0; | |
322 | spin_unlock_bh(&port->dp_lock); | |
323 | ||
324 | return room; | |
325 | } | |
326 | ||
327 | static void | |
328 | micvcons_set_termios(struct tty_struct *tty, struct ktermios * old) | |
329 | { | |
330 | } | |
331 | ||
332 | static int | |
333 | micvcons_readchars(micvcons_port_t *port) | |
334 | { | |
335 | int len, ret, get_count; | |
336 | int bytes_total = 0; | |
337 | int bytes_read = 0; | |
338 | char buf[64]; | |
339 | ||
340 | for (;;) { | |
341 | len = micscif_rb_count(port->dp_in, sizeof(buf)); | |
342 | if (!len) | |
343 | break; | |
344 | get_count = min(len, (int)sizeof(buf)); | |
345 | ret = micscif_rb_get_next(port->dp_in, buf, get_count); | |
346 | micscif_rb_update_read_ptr(port->dp_in); | |
347 | if (port->dp_reader && port->dp_canread) { | |
348 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)) | |
349 | if ((bytes_read = tty_insert_flip_string( | |
350 | &port->port, buf, get_count)) != 0) | |
351 | tty_flip_buffer_push(&port->port); | |
352 | #else | |
353 | bytes_read = tty_insert_flip_string(port->dp_tty, | |
354 | buf, get_count); | |
355 | tty_flip_buffer_push(port->dp_tty); | |
356 | #endif | |
357 | bytes_total += bytes_read; | |
358 | if (bytes_read != get_count) { | |
359 | printk(KERN_WARNING "dropping characters: \ | |
360 | bytes_read %d, get_count %d\n", | |
361 | bytes_read, get_count); | |
362 | break; | |
363 | } | |
364 | } | |
365 | } | |
366 | return bytes_total; | |
367 | } | |
368 | ||
369 | static int | |
370 | micvcons_initport(micvcons_port_t *port) | |
371 | { | |
372 | struct vcons_buf *vcons_host_header; | |
373 | struct vcons_mic_header *vcons_mic_header; | |
374 | char *mic_hdr, *mic_buf, *host_buf; | |
375 | ||
376 | vcons_host_header = (struct vcons_buf *)port->dp_vcons->dc_hdr_virt; | |
377 | if (!vcons_host_header) { | |
378 | printk(KERN_ERR "vcons_host_header NULL\n"); | |
379 | return -EFAULT; | |
380 | } | |
381 | ||
382 | host_buf = (char *)port->dp_vcons->dc_buf_virt; | |
383 | if (!host_buf) { | |
384 | printk(KERN_ERR "host_buf NULL\n"); | |
385 | return -EFAULT; | |
386 | } | |
387 | ||
388 | if (port->dp_bdinfo->bi_ctx.bi_family == FAMILY_ABR) { | |
389 | set_pci_aperture(&port->dp_bdinfo->bi_ctx, | |
390 | (port->dp_bdinfo->bi_ctx.aper.len - PAGE_SIZE) >> PAGE_SHIFT, | |
391 | vcons_host_header->i_hdr_addr & PAGE_MASK, PAGE_SIZE); | |
392 | mic_hdr = port->dp_bdinfo->bi_ctx.aper.va + | |
393 | port->dp_bdinfo->bi_ctx.aper.len - PAGE_SIZE; | |
394 | mic_buf = mic_hdr + PAGE_SIZE/2; | |
395 | } else { | |
396 | mic_hdr = port->dp_bdinfo->bi_ctx.aper.va + vcons_host_header->i_hdr_addr; | |
397 | mic_buf = port->dp_bdinfo->bi_ctx.aper.va + vcons_host_header->i_buf_addr; | |
398 | } | |
399 | ||
400 | port->dp_in = kmalloc(sizeof(struct micscif_rb), GFP_ATOMIC); | |
401 | if (port->dp_in) | |
402 | port->dp_out = kmalloc(sizeof(struct micscif_rb), GFP_ATOMIC); | |
403 | else | |
404 | return -ENOMEM; | |
405 | ||
406 | if (port->dp_out) { | |
407 | vcons_mic_header = (struct vcons_mic_header *)mic_hdr; | |
408 | micscif_rb_init(port->dp_in, | |
409 | &vcons_mic_header->o_rd, | |
410 | &vcons_host_header->o_wr, | |
411 | host_buf, | |
412 | vcons_host_header->o_size); | |
413 | micscif_rb_init(port->dp_out, &vcons_host_header->i_rd, | |
414 | &vcons_mic_header->i_wr, | |
415 | mic_buf, | |
416 | vcons_host_header->i_size); | |
417 | wmb(); | |
418 | writel(MIC_VCONS_HOST_OPEN, &vcons_mic_header->host_status); | |
419 | } else { | |
420 | kfree(port->dp_in); | |
421 | return -ENOMEM; | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int | |
427 | micvcons_readport(micvcons_port_t *port) | |
428 | { | |
429 | int num_chars_read = 0, status; | |
430 | static uint32_t prev_mic_magic; | |
431 | struct vcons_buf *vcons_host_header; | |
432 | ||
433 | if (!port || !port->dp_vcons) | |
434 | return 0; | |
435 | ||
436 | spin_lock_bh(&port->dp_lock); | |
437 | if (!port->dp_tty) { | |
438 | spin_unlock_bh(&port->dp_lock); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | vcons_host_header = (struct vcons_buf *)port->dp_vcons->dc_hdr_virt; | |
443 | if ((vcons_host_header->mic_magic != MIC_VCONS_READY) && | |
444 | (vcons_host_header->mic_magic != MIC_VCONS_SLEEPING)) { | |
445 | if ((vcons_host_header->mic_magic == MIC_VCONS_RB_VER_ERR) | |
446 | && (vcons_host_header->mic_magic != prev_mic_magic)) { | |
447 | printk(KERN_ERR "Card and host ring buffer versions mismatch."); | |
448 | printk(KERN_ERR "Card version: %d, Host version: %d \n", | |
449 | vcons_host_header->mic_rb_ver, | |
450 | vcons_host_header->host_rb_ver); | |
451 | } | |
452 | goto exit; | |
453 | } | |
454 | if (!port->dp_in) { | |
455 | status = micvcons_initport(port); | |
456 | if (status != 0) { | |
457 | spin_unlock_bh(&port->dp_lock); | |
458 | return status; | |
459 | } | |
460 | } | |
461 | ||
462 | if (port->dp_in) { | |
463 | if (vcons_host_header->mic_magic == MIC_VCONS_SLEEPING) { | |
464 | /* | |
465 | * If the card is sleeping and there is data in the | |
466 | * buffer, schedule work in a work queue to wake-up | |
467 | * the card and read from the buffer. | |
468 | */ | |
469 | if (micscif_rb_count(port->dp_in, 1)) | |
470 | queue_work(port->dp_wq, | |
471 | &port->dp_wakeup_read_buf); | |
472 | } else { | |
473 | num_chars_read = micvcons_readchars(port); | |
474 | tty_wakeup(port->dp_tty); | |
475 | } | |
476 | } | |
477 | exit: | |
478 | prev_mic_magic = vcons_host_header->mic_magic; | |
479 | spin_unlock_bh(&port->dp_lock); | |
480 | return num_chars_read; | |
481 | } | |
482 | ||
483 | static void | |
484 | micvcons_wakeup_readbuf(struct work_struct *work) | |
485 | { | |
486 | u8 card_alive = 1; | |
487 | int status; | |
488 | micvcons_port_t *port; | |
489 | struct vcons_buf *vcons_host_header; | |
490 | ||
491 | port = container_of(work, micvcons_port_t, dp_wakeup_read_buf); | |
492 | ||
493 | vcons_host_header = (struct vcons_buf *)port->dp_vcons->dc_hdr_virt; | |
494 | spin_lock_bh(&port->dp_lock); | |
495 | status = micvcons_resume(get_per_dev_ctx(port->dp_tty->index)); | |
496 | if (status == 0) { | |
497 | micvcons_readchars(port); | |
498 | tty_wakeup(port->dp_tty); | |
499 | } else { | |
500 | /* If card can not wakeup, it is dead. */ | |
501 | card_alive = 0; | |
502 | } | |
503 | spin_unlock_bh(&port->dp_lock); | |
504 | if (!card_alive) | |
505 | micvcons_del_timer_entry(port); | |
506 | } | |
507 | ||
508 | static void | |
f4a476d1 | 509 | micvcons_timeout(struct timer_list *t) |
800f879a | 510 | { |
f4a476d1 AT |
511 | struct timer_wrapper *tm_wrap = from_timer(tm_wrap, t, vcons_timer); |
512 | struct list_head *timer_list_ptr = &tm_wrap->timer_list_head; | |
800f879a AT |
513 | micvcons_port_t *port; |
514 | u8 console_active = 0; | |
515 | int num_chars_read = 0; | |
516 | ||
517 | rcu_read_lock(); | |
518 | list_for_each_entry_rcu(port, timer_list_ptr, list_member) { | |
519 | num_chars_read = micvcons_readport(port); | |
520 | if (num_chars_read != 0) | |
521 | console_active = 1; | |
522 | } | |
523 | rcu_read_unlock(); | |
524 | ||
525 | spin_lock(&timer_list_lock); | |
526 | if (restart_timer_flag == MICVCONS_TIMER_RESTART) { | |
527 | extra_timeout = (console_active ? 0 : | |
528 | extra_timeout + MICVCONS_SHORT_TIMEOUT); | |
529 | extra_timeout = min(extra_timeout, (u16)MICVCONS_MAX_TIMEOUT); | |
f4a476d1 | 530 | mod_timer(&timer_wrapper.vcons_timer, jiffies + |
800f879a AT |
531 | msecs_to_jiffies(MICVCONS_SHORT_TIMEOUT+extra_timeout)); |
532 | } | |
533 | spin_unlock(&timer_list_lock); | |
534 | } | |
535 | ||
536 | static void | |
537 | micvcons_throttle(struct tty_struct *tty) | |
538 | { | |
539 | micvcons_port_t *port = (micvcons_port_t *)tty->driver_data; | |
540 | port->dp_canread = 0; | |
541 | } | |
542 | ||
543 | static void | |
544 | micvcons_unthrottle(struct tty_struct *tty) | |
545 | { | |
546 | micvcons_port_t *port = (micvcons_port_t *)tty->driver_data; | |
547 | port->dp_canread = 1; | |
548 | } | |
549 | ||
550 | int micvcons_start(mic_ctx_t *mic_ctx) | |
551 | { | |
552 | struct vcons_buf *vcons_host_header; | |
553 | int status; | |
554 | micvcons_port_t *port = mic_ctx->bd_info->bi_port; | |
555 | ||
556 | vcons_host_header = (struct vcons_buf *)port->dp_vcons->dc_hdr_virt; | |
557 | if (vcons_host_header->mic_magic == MIC_VCONS_SLEEPING) { | |
558 | status = micvcons_resume(mic_ctx); | |
559 | if (status != 0) | |
560 | return status; | |
561 | } | |
562 | if (vcons_host_header->mic_magic == MIC_VCONS_READY) { | |
563 | if (!port->dp_in) { | |
564 | status = micvcons_initport(port); | |
565 | if (status != 0) | |
566 | return status; | |
567 | } | |
568 | } | |
569 | return 0; | |
570 | } | |
571 | ||
572 | int micvcons_port_write(struct micvcons_port *port, const unsigned char *buf, | |
573 | int count) | |
574 | { | |
575 | int ret; | |
576 | uint32_t bytes = 0; | |
577 | ||
578 | if (port->dp_out) { | |
579 | bytes = min(count, micscif_rb_space(port->dp_out)); | |
580 | ret = micscif_rb_write(port->dp_out, (void *)buf, bytes); | |
581 | BUG_ON(ret); | |
582 | port->dp_bytes += bytes; | |
583 | micscif_rb_commit(port->dp_out); | |
584 | } | |
585 | return bytes; | |
586 | } | |
587 | ||
588 | /** | |
589 | * micvcons_stop - cleans up before a node is rebooted | |
590 | * @ mic_ctx: node to clean up | |
591 | * | |
592 | * Called before rebooting a node, reads remaining characters | |
593 | * from the node's vcons output buffer, resets the input/output | |
594 | * ring buffers so that things work when the node comes up again | |
595 | */ | |
596 | void | |
597 | micvcons_stop(mic_ctx_t *mic_ctx) | |
598 | { | |
599 | micvcons_port_t *port; | |
600 | struct vcons_buf *vcons_host_header; | |
601 | ||
602 | port = mic_ctx->bd_info->bi_port; | |
603 | micvcons_readport(port); | |
604 | spin_lock_bh(&port->dp_lock); | |
605 | if (port->dp_in) { | |
606 | vcons_host_header = (struct vcons_buf *)port->dp_vcons->dc_hdr_virt; | |
607 | vcons_host_header->mic_magic = 0; | |
608 | kfree(port->dp_in); | |
609 | kfree(port->dp_out); | |
610 | port->dp_in = NULL; | |
611 | port->dp_out = NULL; | |
612 | } | |
613 | spin_unlock_bh(&port->dp_lock); | |
614 | } | |
615 | ||
616 | /** | |
617 | * micvcons_resume - sets the state of a node's console to ready | |
618 | * @ mic_ctx: node to clean up | |
619 | * | |
620 | * @ return: zero if successful. | |
621 | * called before resuming a node from PC6. MUST acquire the spinlock | |
622 | * port->dp_lock with bottom-halves disabled before calling this function. | |
623 | */ | |
624 | static int | |
625 | micvcons_resume(mic_ctx_t *mic_ctx) | |
626 | { | |
627 | int status = 0; | |
628 | micvcons_port_t *port; | |
629 | struct vcons_buf *vcons_host_header; | |
630 | ||
631 | port = mic_ctx->bd_info->bi_port; | |
632 | vcons_host_header = mic_ctx->bi_vcons.dc_hdr_virt; | |
633 | if (vcons_host_header->mic_magic == MIC_VCONS_SLEEPING) { | |
634 | do { | |
635 | vcons_host_header->mic_magic = MIC_VCONS_WAKINGUP; | |
636 | spin_unlock_bh(&port->dp_lock); | |
637 | status = micscif_connect_node(mic_get_scifnode_id(mic_ctx), false); | |
638 | spin_lock_bh(&port->dp_lock); | |
639 | } while ((status == 0) && | |
640 | (vcons_host_header->mic_magic == MIC_VCONS_SLEEPING)); | |
641 | if (status == 0) | |
642 | vcons_host_header->mic_magic = MIC_VCONS_READY; | |
643 | } | |
644 | return status; | |
645 | } | |
646 | ||
647 | /** | |
648 | * micvcons_pm_disconnect_node - Check if a card can be put to sleep in case | |
649 | * there is any activity on the virtual console. If yes, it also sets the | |
650 | * internal state of a node's console to sleeping. | |
651 | * @ node_bitmask: bits set indicate which cards to check. | |
652 | * Bit-1 for the first, Bit-2 for the second,... | |
653 | * Ignore Bit-0 which indicates host. | |
654 | * @ return: bits set indicating which cards can sleep. | |
655 | * This is called from PM to check if a card can be put to sleep (PC-6 state). | |
656 | * This is called when the node is disconnected from the SCIF network | |
657 | * before putting it into the PC6 state where it should no longer | |
658 | * receive an PCIe transactions until woken up by the host driver. | |
659 | */ | |
660 | int | |
661 | micvcons_pm_disconnect_node(uint8_t *node_bitmask, enum disconn_type type) | |
662 | { | |
663 | int err = 0; | |
664 | if ((type == DISCONN_TYPE_POWER_MGMT) && (node_bitmask)) { | |
665 | int i = 0; | |
666 | mic_ctx_t *mic_ctx; | |
667 | micvcons_port_t *port; | |
668 | struct vcons_buf *vcons_host_header; | |
669 | ||
670 | for (i = 0; i <= mic_data.dd_numdevs; i++) { | |
671 | if (!get_nodemask_bit(node_bitmask, i)) | |
672 | continue; | |
673 | ||
674 | if (!(mic_ctx = get_per_dev_ctx(i - 1))) | |
675 | continue; | |
676 | ||
677 | port = mic_ctx->bd_info->bi_port; | |
678 | micvcons_readport(port); | |
679 | /* | |
680 | * If this function is called when virtual console is | |
681 | * not active, port->dp_vcons needs to be initialized. | |
682 | */ | |
683 | if (!port->dp_vcons) | |
684 | port->dp_vcons = &mic_ctx->bi_vcons; | |
685 | ||
686 | vcons_host_header = (struct vcons_buf *)port->dp_vcons->dc_hdr_virt; | |
687 | spin_lock_bh(&port->dp_lock); | |
688 | vcons_host_header->mic_magic = MIC_VCONS_SLEEPING; | |
689 | spin_unlock_bh(&port->dp_lock); | |
690 | } | |
691 | } | |
692 | ||
693 | return err; | |
694 | } | |
695 |