Commit | Line | Data |
---|---|---|
57562a72 CG |
1 | /* |
2 | * core.c - Implementation of core module of MOST Linux driver stack | |
3 | * | |
4 | * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * This file is licensed under GPLv2. | |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | #include <linux/module.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/poll.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/kobject.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/completion.h> | |
26 | #include <linux/sysfs.h> | |
27 | #include <linux/kthread.h> | |
28 | #include <linux/dma-mapping.h> | |
29 | #include <linux/idr.h> | |
30 | #include "mostcore.h" | |
31 | ||
32 | #define MAX_CHANNELS 64 | |
33 | #define STRING_SIZE 80 | |
34 | ||
35 | static struct class *most_class; | |
36 | static struct device *class_glue_dir; | |
37 | static struct ida mdev_id; | |
71457d48 | 38 | static int dummy_num_buffers; |
57562a72 | 39 | |
ccfbaee0 CG |
40 | struct most_c_aim_obj { |
41 | struct most_aim *ptr; | |
42 | int refs; | |
43 | int num_buffers; | |
44 | }; | |
45 | ||
57562a72 CG |
46 | struct most_c_obj { |
47 | struct kobject kobj; | |
48 | struct completion cleanup; | |
49 | atomic_t mbo_ref; | |
50 | atomic_t mbo_nq_level; | |
2aa9b96f | 51 | u16 channel_id; |
57562a72 | 52 | bool is_poisoned; |
f13f6981 | 53 | struct mutex start_mutex; |
57562a72 CG |
54 | int is_starving; |
55 | struct most_interface *iface; | |
56 | struct most_inst_obj *inst; | |
57 | struct most_channel_config cfg; | |
58 | bool keep_mbo; | |
59 | bool enqueue_halt; | |
60 | struct list_head fifo; | |
61 | spinlock_t fifo_lock; | |
62 | struct list_head halt_fifo; | |
63 | struct list_head list; | |
ccfbaee0 CG |
64 | struct most_c_aim_obj aim0; |
65 | struct most_c_aim_obj aim1; | |
57562a72 CG |
66 | struct list_head trash_fifo; |
67 | struct task_struct *hdm_enqueue_task; | |
57562a72 CG |
68 | wait_queue_head_t hdm_fifo_wq; |
69 | }; | |
9cbe5aa6 | 70 | |
57562a72 CG |
71 | #define to_c_obj(d) container_of(d, struct most_c_obj, kobj) |
72 | ||
73 | struct most_inst_obj { | |
74 | int dev_id; | |
57562a72 CG |
75 | struct most_interface *iface; |
76 | struct list_head channel_list; | |
77 | struct most_c_obj *channel[MAX_CHANNELS]; | |
78 | struct kobject kobj; | |
79 | struct list_head list; | |
80 | }; | |
9cbe5aa6 | 81 | |
e7f2b70f HPGE |
82 | static const struct { |
83 | int most_ch_data_type; | |
84 | char *name; | |
85 | } ch_data_type[] = { { MOST_CH_CONTROL, "control\n" }, | |
86 | { MOST_CH_ASYNC, "async\n" }, | |
87 | { MOST_CH_SYNC, "sync\n" }, | |
88 | { MOST_CH_ISOC_AVP, "isoc_avp\n"} }; | |
89 | ||
57562a72 CG |
90 | #define to_inst_obj(d) container_of(d, struct most_inst_obj, kobj) |
91 | ||
92 | /** | |
93 | * list_pop_mbo - retrieves the first MBO of the list and removes it | |
94 | * @ptr: the list head to grab the MBO from. | |
95 | */ | |
96 | #define list_pop_mbo(ptr) \ | |
97 | ({ \ | |
98 | struct mbo *_mbo = list_first_entry(ptr, struct mbo, list); \ | |
99 | list_del(&_mbo->list); \ | |
100 | _mbo; \ | |
101 | }) | |
102 | ||
57562a72 CG |
103 | /* ___ ___ |
104 | * ___C H A N N E L___ | |
105 | */ | |
106 | ||
107 | /** | |
108 | * struct most_c_attr - to access the attributes of a channel object | |
109 | * @attr: attributes of a channel | |
110 | * @show: pointer to the show function | |
111 | * @store: pointer to the store function | |
112 | */ | |
113 | struct most_c_attr { | |
114 | struct attribute attr; | |
115 | ssize_t (*show)(struct most_c_obj *d, | |
116 | struct most_c_attr *attr, | |
117 | char *buf); | |
118 | ssize_t (*store)(struct most_c_obj *d, | |
119 | struct most_c_attr *attr, | |
120 | const char *buf, | |
121 | size_t count); | |
122 | }; | |
9cbe5aa6 | 123 | |
57562a72 CG |
124 | #define to_channel_attr(a) container_of(a, struct most_c_attr, attr) |
125 | ||
126 | #define MOST_CHNL_ATTR(_name, _mode, _show, _store) \ | |
127 | struct most_c_attr most_chnl_attr_##_name = \ | |
128 | __ATTR(_name, _mode, _show, _store) | |
129 | ||
130 | /** | |
131 | * channel_attr_show - show function of channel object | |
132 | * @kobj: pointer to its kobject | |
133 | * @attr: pointer to its attributes | |
134 | * @buf: buffer | |
135 | */ | |
136 | static ssize_t channel_attr_show(struct kobject *kobj, struct attribute *attr, | |
137 | char *buf) | |
138 | { | |
139 | struct most_c_attr *channel_attr = to_channel_attr(attr); | |
140 | struct most_c_obj *c_obj = to_c_obj(kobj); | |
141 | ||
142 | if (!channel_attr->show) | |
143 | return -EIO; | |
144 | ||
145 | return channel_attr->show(c_obj, channel_attr, buf); | |
146 | } | |
147 | ||
148 | /** | |
149 | * channel_attr_store - store function of channel object | |
150 | * @kobj: pointer to its kobject | |
151 | * @attr: pointer to its attributes | |
152 | * @buf: buffer | |
153 | * @len: length of buffer | |
154 | */ | |
155 | static ssize_t channel_attr_store(struct kobject *kobj, | |
156 | struct attribute *attr, | |
157 | const char *buf, | |
158 | size_t len) | |
159 | { | |
160 | struct most_c_attr *channel_attr = to_channel_attr(attr); | |
161 | struct most_c_obj *c_obj = to_c_obj(kobj); | |
162 | ||
163 | if (!channel_attr->store) | |
164 | return -EIO; | |
165 | return channel_attr->store(c_obj, channel_attr, buf, len); | |
166 | } | |
167 | ||
168 | static const struct sysfs_ops most_channel_sysfs_ops = { | |
169 | .show = channel_attr_show, | |
170 | .store = channel_attr_store, | |
171 | }; | |
172 | ||
173 | /** | |
174 | * most_free_mbo_coherent - free an MBO and its coherent buffer | |
175 | * @mbo: buffer to be released | |
176 | * | |
177 | */ | |
178 | static void most_free_mbo_coherent(struct mbo *mbo) | |
179 | { | |
180 | struct most_c_obj *c = mbo->context; | |
181 | u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len; | |
182 | ||
183 | dma_free_coherent(NULL, coherent_buf_size, mbo->virt_address, | |
184 | mbo->bus_address); | |
185 | kfree(mbo); | |
186 | if (atomic_sub_and_test(1, &c->mbo_ref)) | |
187 | complete(&c->cleanup); | |
188 | } | |
189 | ||
190 | /** | |
191 | * flush_channel_fifos - clear the channel fifos | |
192 | * @c: pointer to channel object | |
193 | */ | |
c942ea7a | 194 | static void flush_channel_fifos(struct most_c_obj *c) |
57562a72 CG |
195 | { |
196 | unsigned long flags, hf_flags; | |
197 | struct mbo *mbo, *tmp; | |
198 | ||
199 | if (list_empty(&c->fifo) && list_empty(&c->halt_fifo)) | |
200 | return; | |
201 | ||
202 | spin_lock_irqsave(&c->fifo_lock, flags); | |
203 | list_for_each_entry_safe(mbo, tmp, &c->fifo, list) { | |
204 | list_del(&mbo->list); | |
205 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
0834be6c | 206 | most_free_mbo_coherent(mbo); |
57562a72 CG |
207 | spin_lock_irqsave(&c->fifo_lock, flags); |
208 | } | |
209 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
210 | ||
211 | spin_lock_irqsave(&c->fifo_lock, hf_flags); | |
212 | list_for_each_entry_safe(mbo, tmp, &c->halt_fifo, list) { | |
213 | list_del(&mbo->list); | |
214 | spin_unlock_irqrestore(&c->fifo_lock, hf_flags); | |
0834be6c | 215 | most_free_mbo_coherent(mbo); |
57562a72 CG |
216 | spin_lock_irqsave(&c->fifo_lock, hf_flags); |
217 | } | |
218 | spin_unlock_irqrestore(&c->fifo_lock, hf_flags); | |
219 | ||
220 | if (unlikely((!list_empty(&c->fifo) || !list_empty(&c->halt_fifo)))) | |
221 | pr_info("WARN: fifo | trash fifo not empty\n"); | |
222 | } | |
223 | ||
224 | /** | |
225 | * flush_trash_fifo - clear the trash fifo | |
226 | * @c: pointer to channel object | |
227 | */ | |
228 | static int flush_trash_fifo(struct most_c_obj *c) | |
229 | { | |
230 | struct mbo *mbo, *tmp; | |
231 | unsigned long flags; | |
232 | ||
233 | spin_lock_irqsave(&c->fifo_lock, flags); | |
234 | list_for_each_entry_safe(mbo, tmp, &c->trash_fifo, list) { | |
235 | list_del(&mbo->list); | |
236 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
237 | most_free_mbo_coherent(mbo); | |
238 | spin_lock_irqsave(&c->fifo_lock, flags); | |
239 | } | |
240 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | /** | |
245 | * most_channel_release - release function of channel object | |
246 | * @kobj: pointer to channel's kobject | |
247 | */ | |
248 | static void most_channel_release(struct kobject *kobj) | |
249 | { | |
250 | struct most_c_obj *c = to_c_obj(kobj); | |
251 | ||
252 | kfree(c); | |
253 | } | |
254 | ||
255 | static ssize_t show_available_directions(struct most_c_obj *c, | |
edaa1e33 CG |
256 | struct most_c_attr *attr, |
257 | char *buf) | |
57562a72 CG |
258 | { |
259 | unsigned int i = c->channel_id; | |
260 | ||
261 | strcpy(buf, ""); | |
262 | if (c->iface->channel_vector[i].direction & MOST_CH_RX) | |
263 | strcat(buf, "dir_rx "); | |
264 | if (c->iface->channel_vector[i].direction & MOST_CH_TX) | |
265 | strcat(buf, "dir_tx "); | |
266 | strcat(buf, "\n"); | |
267 | return strlen(buf) + 1; | |
268 | } | |
269 | ||
270 | static ssize_t show_available_datatypes(struct most_c_obj *c, | |
271 | struct most_c_attr *attr, | |
272 | char *buf) | |
273 | { | |
274 | unsigned int i = c->channel_id; | |
275 | ||
276 | strcpy(buf, ""); | |
277 | if (c->iface->channel_vector[i].data_type & MOST_CH_CONTROL) | |
278 | strcat(buf, "control "); | |
279 | if (c->iface->channel_vector[i].data_type & MOST_CH_ASYNC) | |
280 | strcat(buf, "async "); | |
281 | if (c->iface->channel_vector[i].data_type & MOST_CH_SYNC) | |
282 | strcat(buf, "sync "); | |
283 | if (c->iface->channel_vector[i].data_type & MOST_CH_ISOC_AVP) | |
284 | strcat(buf, "isoc_avp "); | |
285 | strcat(buf, "\n"); | |
286 | return strlen(buf) + 1; | |
287 | } | |
288 | ||
289 | static | |
290 | ssize_t show_number_of_packet_buffers(struct most_c_obj *c, | |
291 | struct most_c_attr *attr, | |
292 | char *buf) | |
293 | { | |
294 | unsigned int i = c->channel_id; | |
295 | ||
296 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
297 | c->iface->channel_vector[i].num_buffers_packet); | |
298 | } | |
299 | ||
300 | static | |
301 | ssize_t show_number_of_stream_buffers(struct most_c_obj *c, | |
302 | struct most_c_attr *attr, | |
303 | char *buf) | |
304 | { | |
305 | unsigned int i = c->channel_id; | |
306 | ||
307 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
308 | c->iface->channel_vector[i].num_buffers_streaming); | |
309 | } | |
310 | ||
311 | static | |
312 | ssize_t show_size_of_packet_buffer(struct most_c_obj *c, | |
313 | struct most_c_attr *attr, | |
314 | char *buf) | |
315 | { | |
316 | unsigned int i = c->channel_id; | |
317 | ||
318 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
319 | c->iface->channel_vector[i].buffer_size_packet); | |
320 | } | |
321 | ||
322 | static | |
323 | ssize_t show_size_of_stream_buffer(struct most_c_obj *c, | |
324 | struct most_c_attr *attr, | |
325 | char *buf) | |
326 | { | |
327 | unsigned int i = c->channel_id; | |
328 | ||
329 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
330 | c->iface->channel_vector[i].buffer_size_streaming); | |
331 | } | |
332 | ||
333 | static ssize_t show_channel_starving(struct most_c_obj *c, | |
334 | struct most_c_attr *attr, | |
335 | char *buf) | |
336 | { | |
337 | return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving); | |
338 | } | |
339 | ||
57562a72 | 340 | #define create_show_channel_attribute(val) \ |
add04a98 | 341 | static MOST_CHNL_ATTR(val, S_IRUGO, show_##val, NULL) |
57562a72 CG |
342 | |
343 | create_show_channel_attribute(available_directions); | |
344 | create_show_channel_attribute(available_datatypes); | |
345 | create_show_channel_attribute(number_of_packet_buffers); | |
346 | create_show_channel_attribute(number_of_stream_buffers); | |
347 | create_show_channel_attribute(size_of_stream_buffer); | |
348 | create_show_channel_attribute(size_of_packet_buffer); | |
349 | create_show_channel_attribute(channel_starving); | |
350 | ||
351 | static ssize_t show_set_number_of_buffers(struct most_c_obj *c, | |
352 | struct most_c_attr *attr, | |
353 | char *buf) | |
354 | { | |
355 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers); | |
356 | } | |
357 | ||
358 | static ssize_t store_set_number_of_buffers(struct most_c_obj *c, | |
359 | struct most_c_attr *attr, | |
360 | const char *buf, | |
361 | size_t count) | |
362 | { | |
363 | int ret = kstrtou16(buf, 0, &c->cfg.num_buffers); | |
364 | ||
365 | if (ret) | |
366 | return ret; | |
367 | return count; | |
368 | } | |
369 | ||
370 | static ssize_t show_set_buffer_size(struct most_c_obj *c, | |
371 | struct most_c_attr *attr, | |
372 | char *buf) | |
373 | { | |
374 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size); | |
375 | } | |
376 | ||
377 | static ssize_t store_set_buffer_size(struct most_c_obj *c, | |
378 | struct most_c_attr *attr, | |
379 | const char *buf, | |
380 | size_t count) | |
381 | { | |
382 | int ret = kstrtou16(buf, 0, &c->cfg.buffer_size); | |
383 | ||
384 | if (ret) | |
385 | return ret; | |
386 | return count; | |
387 | } | |
388 | ||
389 | static ssize_t show_set_direction(struct most_c_obj *c, | |
390 | struct most_c_attr *attr, | |
391 | char *buf) | |
392 | { | |
393 | if (c->cfg.direction & MOST_CH_TX) | |
394 | return snprintf(buf, PAGE_SIZE, "dir_tx\n"); | |
395 | else if (c->cfg.direction & MOST_CH_RX) | |
396 | return snprintf(buf, PAGE_SIZE, "dir_rx\n"); | |
397 | return snprintf(buf, PAGE_SIZE, "unconfigured\n"); | |
398 | } | |
399 | ||
400 | static ssize_t store_set_direction(struct most_c_obj *c, | |
401 | struct most_c_attr *attr, | |
402 | const char *buf, | |
403 | size_t count) | |
404 | { | |
9deba73d | 405 | if (!strcmp(buf, "dir_rx\n")) { |
57562a72 | 406 | c->cfg.direction = MOST_CH_RX; |
9deba73d | 407 | } else if (!strcmp(buf, "dir_tx\n")) { |
57562a72 | 408 | c->cfg.direction = MOST_CH_TX; |
9deba73d | 409 | } else { |
57562a72 CG |
410 | pr_info("WARN: invalid attribute settings\n"); |
411 | return -EINVAL; | |
412 | } | |
413 | return count; | |
414 | } | |
415 | ||
416 | static ssize_t show_set_datatype(struct most_c_obj *c, | |
417 | struct most_c_attr *attr, | |
418 | char *buf) | |
419 | { | |
e7f2b70f HPGE |
420 | int i; |
421 | ||
422 | for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) { | |
423 | if (c->cfg.data_type & ch_data_type[i].most_ch_data_type) | |
424 | return snprintf(buf, PAGE_SIZE, ch_data_type[i].name); | |
425 | } | |
57562a72 CG |
426 | return snprintf(buf, PAGE_SIZE, "unconfigured\n"); |
427 | } | |
428 | ||
429 | static ssize_t store_set_datatype(struct most_c_obj *c, | |
430 | struct most_c_attr *attr, | |
431 | const char *buf, | |
432 | size_t count) | |
433 | { | |
e7f2b70f HPGE |
434 | int i; |
435 | ||
436 | for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) { | |
437 | if (!strcmp(buf, ch_data_type[i].name)) { | |
438 | c->cfg.data_type = ch_data_type[i].most_ch_data_type; | |
439 | break; | |
440 | } | |
441 | } | |
442 | ||
443 | if (i == ARRAY_SIZE(ch_data_type)) { | |
57562a72 CG |
444 | pr_info("WARN: invalid attribute settings\n"); |
445 | return -EINVAL; | |
446 | } | |
447 | return count; | |
448 | } | |
449 | ||
450 | static ssize_t show_set_subbuffer_size(struct most_c_obj *c, | |
451 | struct most_c_attr *attr, | |
452 | char *buf) | |
453 | { | |
454 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size); | |
455 | } | |
456 | ||
457 | static ssize_t store_set_subbuffer_size(struct most_c_obj *c, | |
458 | struct most_c_attr *attr, | |
459 | const char *buf, | |
460 | size_t count) | |
461 | { | |
462 | int ret = kstrtou16(buf, 0, &c->cfg.subbuffer_size); | |
463 | ||
464 | if (ret) | |
465 | return ret; | |
466 | return count; | |
467 | } | |
468 | ||
469 | static ssize_t show_set_packets_per_xact(struct most_c_obj *c, | |
470 | struct most_c_attr *attr, | |
471 | char *buf) | |
472 | { | |
473 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact); | |
474 | } | |
475 | ||
476 | static ssize_t store_set_packets_per_xact(struct most_c_obj *c, | |
477 | struct most_c_attr *attr, | |
478 | const char *buf, | |
479 | size_t count) | |
480 | { | |
481 | int ret = kstrtou16(buf, 0, &c->cfg.packets_per_xact); | |
482 | ||
483 | if (ret) | |
484 | return ret; | |
485 | return count; | |
486 | } | |
487 | ||
488 | #define create_channel_attribute(value) \ | |
489 | static MOST_CHNL_ATTR(value, S_IRUGO | S_IWUSR, \ | |
490 | show_##value, \ | |
491 | store_##value) | |
492 | ||
493 | create_channel_attribute(set_buffer_size); | |
494 | create_channel_attribute(set_number_of_buffers); | |
495 | create_channel_attribute(set_direction); | |
496 | create_channel_attribute(set_datatype); | |
497 | create_channel_attribute(set_subbuffer_size); | |
498 | create_channel_attribute(set_packets_per_xact); | |
499 | ||
57562a72 CG |
500 | /** |
501 | * most_channel_def_attrs - array of default attributes of channel object | |
502 | */ | |
503 | static struct attribute *most_channel_def_attrs[] = { | |
504 | &most_chnl_attr_available_directions.attr, | |
505 | &most_chnl_attr_available_datatypes.attr, | |
506 | &most_chnl_attr_number_of_packet_buffers.attr, | |
507 | &most_chnl_attr_number_of_stream_buffers.attr, | |
508 | &most_chnl_attr_size_of_packet_buffer.attr, | |
509 | &most_chnl_attr_size_of_stream_buffer.attr, | |
510 | &most_chnl_attr_set_number_of_buffers.attr, | |
511 | &most_chnl_attr_set_buffer_size.attr, | |
512 | &most_chnl_attr_set_direction.attr, | |
513 | &most_chnl_attr_set_datatype.attr, | |
514 | &most_chnl_attr_set_subbuffer_size.attr, | |
515 | &most_chnl_attr_set_packets_per_xact.attr, | |
516 | &most_chnl_attr_channel_starving.attr, | |
517 | NULL, | |
518 | }; | |
519 | ||
520 | static struct kobj_type most_channel_ktype = { | |
521 | .sysfs_ops = &most_channel_sysfs_ops, | |
522 | .release = most_channel_release, | |
523 | .default_attrs = most_channel_def_attrs, | |
524 | }; | |
525 | ||
526 | static struct kset *most_channel_kset; | |
527 | ||
528 | /** | |
529 | * create_most_c_obj - allocates a channel object | |
530 | * @name: name of the channel object | |
531 | * @parent: parent kobject | |
532 | * | |
533 | * This create a channel object and registers it with sysfs. | |
534 | * Returns a pointer to the object or NULL when something went wrong. | |
535 | */ | |
536 | static struct most_c_obj * | |
537 | create_most_c_obj(const char *name, struct kobject *parent) | |
538 | { | |
539 | struct most_c_obj *c; | |
540 | int retval; | |
541 | ||
542 | c = kzalloc(sizeof(*c), GFP_KERNEL); | |
543 | if (!c) | |
544 | return NULL; | |
545 | c->kobj.kset = most_channel_kset; | |
546 | retval = kobject_init_and_add(&c->kobj, &most_channel_ktype, parent, | |
547 | "%s", name); | |
548 | if (retval) { | |
549 | kobject_put(&c->kobj); | |
550 | return NULL; | |
551 | } | |
552 | kobject_uevent(&c->kobj, KOBJ_ADD); | |
553 | return c; | |
554 | } | |
555 | ||
57562a72 CG |
556 | /* ___ ___ |
557 | * ___I N S T A N C E___ | |
558 | */ | |
559 | #define MOST_INST_ATTR(_name, _mode, _show, _store) \ | |
560 | struct most_inst_attribute most_inst_attr_##_name = \ | |
561 | __ATTR(_name, _mode, _show, _store) | |
562 | ||
563 | static struct list_head instance_list; | |
564 | ||
565 | /** | |
566 | * struct most_inst_attribute - to access the attributes of instance object | |
567 | * @attr: attributes of an instance | |
568 | * @show: pointer to the show function | |
569 | * @store: pointer to the store function | |
570 | */ | |
571 | struct most_inst_attribute { | |
572 | struct attribute attr; | |
573 | ssize_t (*show)(struct most_inst_obj *d, | |
574 | struct most_inst_attribute *attr, | |
575 | char *buf); | |
576 | ssize_t (*store)(struct most_inst_obj *d, | |
577 | struct most_inst_attribute *attr, | |
578 | const char *buf, | |
579 | size_t count); | |
580 | }; | |
9cbe5aa6 | 581 | |
57562a72 CG |
582 | #define to_instance_attr(a) \ |
583 | container_of(a, struct most_inst_attribute, attr) | |
584 | ||
585 | /** | |
586 | * instance_attr_show - show function for an instance object | |
587 | * @kobj: pointer to kobject | |
588 | * @attr: pointer to attribute struct | |
589 | * @buf: buffer | |
590 | */ | |
591 | static ssize_t instance_attr_show(struct kobject *kobj, | |
592 | struct attribute *attr, | |
593 | char *buf) | |
594 | { | |
595 | struct most_inst_attribute *instance_attr; | |
596 | struct most_inst_obj *instance_obj; | |
597 | ||
598 | instance_attr = to_instance_attr(attr); | |
599 | instance_obj = to_inst_obj(kobj); | |
600 | ||
601 | if (!instance_attr->show) | |
602 | return -EIO; | |
603 | ||
604 | return instance_attr->show(instance_obj, instance_attr, buf); | |
605 | } | |
606 | ||
607 | /** | |
608 | * instance_attr_store - store function for an instance object | |
609 | * @kobj: pointer to kobject | |
610 | * @attr: pointer to attribute struct | |
611 | * @buf: buffer | |
612 | * @len: length of buffer | |
613 | */ | |
614 | static ssize_t instance_attr_store(struct kobject *kobj, | |
615 | struct attribute *attr, | |
616 | const char *buf, | |
617 | size_t len) | |
618 | { | |
619 | struct most_inst_attribute *instance_attr; | |
620 | struct most_inst_obj *instance_obj; | |
621 | ||
622 | instance_attr = to_instance_attr(attr); | |
623 | instance_obj = to_inst_obj(kobj); | |
624 | ||
625 | if (!instance_attr->store) | |
626 | return -EIO; | |
627 | ||
628 | return instance_attr->store(instance_obj, instance_attr, buf, len); | |
629 | } | |
630 | ||
631 | static const struct sysfs_ops most_inst_sysfs_ops = { | |
632 | .show = instance_attr_show, | |
633 | .store = instance_attr_store, | |
634 | }; | |
635 | ||
636 | /** | |
637 | * most_inst_release - release function for instance object | |
638 | * @kobj: pointer to instance's kobject | |
639 | * | |
640 | * This frees the allocated memory for the instance object | |
641 | */ | |
642 | static void most_inst_release(struct kobject *kobj) | |
643 | { | |
644 | struct most_inst_obj *inst = to_inst_obj(kobj); | |
645 | ||
646 | kfree(inst); | |
647 | } | |
648 | ||
649 | static ssize_t show_description(struct most_inst_obj *instance_obj, | |
650 | struct most_inst_attribute *attr, | |
651 | char *buf) | |
652 | { | |
653 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
654 | instance_obj->iface->description); | |
655 | } | |
656 | ||
657 | static ssize_t show_interface(struct most_inst_obj *instance_obj, | |
658 | struct most_inst_attribute *attr, | |
659 | char *buf) | |
660 | { | |
661 | switch (instance_obj->iface->interface) { | |
662 | case ITYPE_LOOPBACK: | |
663 | return snprintf(buf, PAGE_SIZE, "loopback\n"); | |
664 | case ITYPE_I2C: | |
665 | return snprintf(buf, PAGE_SIZE, "i2c\n"); | |
666 | case ITYPE_I2S: | |
667 | return snprintf(buf, PAGE_SIZE, "i2s\n"); | |
668 | case ITYPE_TSI: | |
669 | return snprintf(buf, PAGE_SIZE, "tsi\n"); | |
670 | case ITYPE_HBI: | |
671 | return snprintf(buf, PAGE_SIZE, "hbi\n"); | |
672 | case ITYPE_MEDIALB_DIM: | |
673 | return snprintf(buf, PAGE_SIZE, "mlb_dim\n"); | |
674 | case ITYPE_MEDIALB_DIM2: | |
675 | return snprintf(buf, PAGE_SIZE, "mlb_dim2\n"); | |
676 | case ITYPE_USB: | |
677 | return snprintf(buf, PAGE_SIZE, "usb\n"); | |
678 | case ITYPE_PCIE: | |
679 | return snprintf(buf, PAGE_SIZE, "pcie\n"); | |
680 | } | |
681 | return snprintf(buf, PAGE_SIZE, "unknown\n"); | |
682 | } | |
683 | ||
684 | #define create_inst_attribute(value) \ | |
685 | static MOST_INST_ATTR(value, S_IRUGO, show_##value, NULL) | |
686 | ||
687 | create_inst_attribute(description); | |
688 | create_inst_attribute(interface); | |
689 | ||
690 | static struct attribute *most_inst_def_attrs[] = { | |
691 | &most_inst_attr_description.attr, | |
692 | &most_inst_attr_interface.attr, | |
693 | NULL, | |
694 | }; | |
695 | ||
696 | static struct kobj_type most_inst_ktype = { | |
697 | .sysfs_ops = &most_inst_sysfs_ops, | |
698 | .release = most_inst_release, | |
699 | .default_attrs = most_inst_def_attrs, | |
700 | }; | |
701 | ||
702 | static struct kset *most_inst_kset; | |
703 | ||
57562a72 CG |
704 | /** |
705 | * create_most_inst_obj - creates an instance object | |
706 | * @name: name of the object to be created | |
707 | * | |
708 | * This allocates memory for an instance structure, assigns the proper kset | |
709 | * and registers it with sysfs. | |
710 | * | |
711 | * Returns a pointer to the instance object or NULL when something went wrong. | |
712 | */ | |
713 | static struct most_inst_obj *create_most_inst_obj(const char *name) | |
714 | { | |
715 | struct most_inst_obj *inst; | |
716 | int retval; | |
717 | ||
718 | inst = kzalloc(sizeof(*inst), GFP_KERNEL); | |
719 | if (!inst) | |
720 | return NULL; | |
721 | inst->kobj.kset = most_inst_kset; | |
722 | retval = kobject_init_and_add(&inst->kobj, &most_inst_ktype, NULL, | |
723 | "%s", name); | |
724 | if (retval) { | |
725 | kobject_put(&inst->kobj); | |
726 | return NULL; | |
727 | } | |
728 | kobject_uevent(&inst->kobj, KOBJ_ADD); | |
729 | return inst; | |
730 | } | |
731 | ||
732 | /** | |
733 | * destroy_most_inst_obj - MOST instance release function | |
734 | * @inst: pointer to the instance object | |
735 | * | |
736 | * This decrements the reference counter of the instance object. | |
737 | * If the reference count turns zero, its release function is called | |
738 | */ | |
739 | static void destroy_most_inst_obj(struct most_inst_obj *inst) | |
740 | { | |
741 | struct most_c_obj *c, *tmp; | |
742 | ||
57562a72 | 743 | list_for_each_entry_safe(c, tmp, &inst->channel_list, list) { |
9ce039a0 CG |
744 | flush_trash_fifo(c); |
745 | flush_channel_fifos(c); | |
9ce039a0 | 746 | kobject_put(&c->kobj); |
57562a72 CG |
747 | } |
748 | kobject_put(&inst->kobj); | |
749 | } | |
750 | ||
751 | /* ___ ___ | |
752 | * ___A I M___ | |
753 | */ | |
754 | struct most_aim_obj { | |
755 | struct kobject kobj; | |
756 | struct list_head list; | |
757 | struct most_aim *driver; | |
758 | char add_link[STRING_SIZE]; | |
759 | char remove_link[STRING_SIZE]; | |
760 | }; | |
9cbe5aa6 | 761 | |
57562a72 CG |
762 | #define to_aim_obj(d) container_of(d, struct most_aim_obj, kobj) |
763 | ||
764 | static struct list_head aim_list; | |
765 | ||
57562a72 CG |
766 | /** |
767 | * struct most_aim_attribute - to access the attributes of AIM object | |
768 | * @attr: attributes of an AIM | |
769 | * @show: pointer to the show function | |
770 | * @store: pointer to the store function | |
771 | */ | |
772 | struct most_aim_attribute { | |
773 | struct attribute attr; | |
774 | ssize_t (*show)(struct most_aim_obj *d, | |
775 | struct most_aim_attribute *attr, | |
776 | char *buf); | |
777 | ssize_t (*store)(struct most_aim_obj *d, | |
778 | struct most_aim_attribute *attr, | |
779 | const char *buf, | |
780 | size_t count); | |
781 | }; | |
9cbe5aa6 | 782 | |
57562a72 CG |
783 | #define to_aim_attr(a) container_of(a, struct most_aim_attribute, attr) |
784 | ||
785 | /** | |
786 | * aim_attr_show - show function of an AIM object | |
787 | * @kobj: pointer to kobject | |
788 | * @attr: pointer to attribute struct | |
789 | * @buf: buffer | |
790 | */ | |
791 | static ssize_t aim_attr_show(struct kobject *kobj, | |
792 | struct attribute *attr, | |
793 | char *buf) | |
794 | { | |
795 | struct most_aim_attribute *aim_attr; | |
796 | struct most_aim_obj *aim_obj; | |
797 | ||
798 | aim_attr = to_aim_attr(attr); | |
799 | aim_obj = to_aim_obj(kobj); | |
800 | ||
801 | if (!aim_attr->show) | |
802 | return -EIO; | |
803 | ||
804 | return aim_attr->show(aim_obj, aim_attr, buf); | |
805 | } | |
806 | ||
807 | /** | |
808 | * aim_attr_store - store function of an AIM object | |
809 | * @kobj: pointer to kobject | |
810 | * @attr: pointer to attribute struct | |
811 | * @buf: buffer | |
812 | * @len: length of buffer | |
813 | */ | |
814 | static ssize_t aim_attr_store(struct kobject *kobj, | |
815 | struct attribute *attr, | |
816 | const char *buf, | |
817 | size_t len) | |
818 | { | |
819 | struct most_aim_attribute *aim_attr; | |
820 | struct most_aim_obj *aim_obj; | |
821 | ||
822 | aim_attr = to_aim_attr(attr); | |
823 | aim_obj = to_aim_obj(kobj); | |
824 | ||
825 | if (!aim_attr->store) | |
826 | return -EIO; | |
827 | return aim_attr->store(aim_obj, aim_attr, buf, len); | |
828 | } | |
829 | ||
830 | static const struct sysfs_ops most_aim_sysfs_ops = { | |
831 | .show = aim_attr_show, | |
832 | .store = aim_attr_store, | |
833 | }; | |
834 | ||
835 | /** | |
836 | * most_aim_release - AIM release function | |
837 | * @kobj: pointer to AIM's kobject | |
838 | */ | |
839 | static void most_aim_release(struct kobject *kobj) | |
840 | { | |
841 | struct most_aim_obj *aim_obj = to_aim_obj(kobj); | |
842 | ||
843 | kfree(aim_obj); | |
844 | } | |
845 | ||
846 | static ssize_t show_add_link(struct most_aim_obj *aim_obj, | |
847 | struct most_aim_attribute *attr, | |
848 | char *buf) | |
849 | { | |
850 | return snprintf(buf, PAGE_SIZE, "%s\n", aim_obj->add_link); | |
851 | } | |
852 | ||
853 | /** | |
854 | * split_string - parses and changes string in the buffer buf and | |
855 | * splits it into two mandatory and one optional substrings. | |
856 | * | |
857 | * @buf: complete string from attribute 'add_channel' | |
858 | * @a: address of pointer to 1st substring (=instance name) | |
859 | * @b: address of pointer to 2nd substring (=channel name) | |
860 | * @c: optional address of pointer to 3rd substring (=user defined name) | |
861 | * | |
862 | * Examples: | |
863 | * | |
864 | * Input: "mdev0:ch0@ep_81:my_channel\n" or | |
865 | * "mdev0:ch0@ep_81:my_channel" | |
866 | * | |
867 | * Output: *a -> "mdev0", *b -> "ch0@ep_81", *c -> "my_channel" | |
868 | * | |
869 | * Input: "mdev0:ch0@ep_81\n" | |
870 | * Output: *a -> "mdev0", *b -> "ch0@ep_81", *c -> "" | |
871 | * | |
872 | * Input: "mdev0:ch0@ep_81" | |
873 | * Output: *a -> "mdev0", *b -> "ch0@ep_81", *c == NULL | |
874 | */ | |
c942ea7a | 875 | static int split_string(char *buf, char **a, char **b, char **c) |
57562a72 CG |
876 | { |
877 | *a = strsep(&buf, ":"); | |
878 | if (!*a) | |
879 | return -EIO; | |
880 | ||
881 | *b = strsep(&buf, ":\n"); | |
882 | if (!*b) | |
883 | return -EIO; | |
884 | ||
885 | if (c) | |
886 | *c = strsep(&buf, ":\n"); | |
887 | ||
888 | return 0; | |
889 | } | |
890 | ||
891 | /** | |
892 | * get_channel_by_name - get pointer to channel object | |
893 | * @mdev: name of the device instance | |
894 | * @mdev_ch: name of the respective channel | |
895 | * | |
896 | * This retrieves the pointer to a channel object. | |
897 | */ | |
898 | static struct | |
899 | most_c_obj *get_channel_by_name(char *mdev, char *mdev_ch) | |
900 | { | |
901 | struct most_c_obj *c, *tmp; | |
902 | struct most_inst_obj *i, *i_tmp; | |
903 | int found = 0; | |
904 | ||
905 | list_for_each_entry_safe(i, i_tmp, &instance_list, list) { | |
906 | if (!strcmp(kobject_name(&i->kobj), mdev)) { | |
907 | found++; | |
908 | break; | |
909 | } | |
910 | } | |
911 | if (unlikely(!found)) | |
912 | return ERR_PTR(-EIO); | |
913 | ||
914 | list_for_each_entry_safe(c, tmp, &i->channel_list, list) { | |
915 | if (!strcmp(kobject_name(&c->kobj), mdev_ch)) { | |
916 | found++; | |
917 | break; | |
918 | } | |
919 | } | |
47af41b0 | 920 | if (unlikely(found < 2)) |
57562a72 CG |
921 | return ERR_PTR(-EIO); |
922 | return c; | |
923 | } | |
924 | ||
925 | /** | |
926 | * store_add_link - store() function for add_link attribute | |
927 | * @aim_obj: pointer to AIM object | |
928 | * @attr: its attributes | |
929 | * @buf: buffer | |
930 | * @len: buffer length | |
931 | * | |
932 | * This parses the string given by buf and splits it into | |
933 | * three substrings. Note: third substring is optional. In case a cdev | |
934 | * AIM is loaded the optional 3rd substring will make up the name of | |
935 | * device node in the /dev directory. If omitted, the device node will | |
936 | * inherit the channel's name within sysfs. | |
937 | * | |
938 | * Searches for a pair of device and channel and probes the AIM | |
939 | * | |
940 | * Example: | |
941 | * (1) echo -n -e "mdev0:ch0@ep_81:my_rxchannel\n" >add_link | |
942 | * (2) echo -n -e "mdev0:ch0@ep_81\n" >add_link | |
943 | * | |
944 | * (1) would create the device node /dev/my_rxchannel | |
945 | * (2) would create the device node /dev/mdev0-ch0@ep_81 | |
946 | */ | |
947 | static ssize_t store_add_link(struct most_aim_obj *aim_obj, | |
948 | struct most_aim_attribute *attr, | |
949 | const char *buf, | |
950 | size_t len) | |
951 | { | |
952 | struct most_c_obj *c; | |
953 | struct most_aim **aim_ptr; | |
954 | char buffer[STRING_SIZE]; | |
955 | char *mdev; | |
956 | char *mdev_ch; | |
957 | char *mdev_devnod; | |
958 | char devnod_buf[STRING_SIZE]; | |
959 | int ret; | |
3f78f611 | 960 | size_t max_len = min_t(size_t, len + 1, STRING_SIZE); |
57562a72 CG |
961 | |
962 | strlcpy(buffer, buf, max_len); | |
963 | strlcpy(aim_obj->add_link, buf, max_len); | |
964 | ||
965 | ret = split_string(buffer, &mdev, &mdev_ch, &mdev_devnod); | |
966 | if (ret) | |
967 | return ret; | |
968 | ||
04ca5837 | 969 | if (!mdev_devnod || *mdev_devnod == 0) { |
1446ff09 CG |
970 | snprintf(devnod_buf, sizeof(devnod_buf), "%s-%s", mdev, |
971 | mdev_ch); | |
57562a72 CG |
972 | mdev_devnod = devnod_buf; |
973 | } | |
974 | ||
975 | c = get_channel_by_name(mdev, mdev_ch); | |
976 | if (IS_ERR(c)) | |
977 | return -ENODEV; | |
978 | ||
ccfbaee0 CG |
979 | if (!c->aim0.ptr) |
980 | aim_ptr = &c->aim0.ptr; | |
981 | else if (!c->aim1.ptr) | |
982 | aim_ptr = &c->aim1.ptr; | |
57562a72 CG |
983 | else |
984 | return -ENOSPC; | |
985 | ||
42e252a6 | 986 | *aim_ptr = aim_obj->driver; |
57562a72 CG |
987 | ret = aim_obj->driver->probe_channel(c->iface, c->channel_id, |
988 | &c->cfg, &c->kobj, mdev_devnod); | |
42e252a6 CG |
989 | if (ret) { |
990 | *aim_ptr = NULL; | |
57562a72 | 991 | return ret; |
42e252a6 CG |
992 | } |
993 | ||
57562a72 CG |
994 | return len; |
995 | } | |
996 | ||
c942ea7a | 997 | static struct most_aim_attribute most_aim_attr_add_link = |
57562a72 CG |
998 | __ATTR(add_link, S_IRUGO | S_IWUSR, show_add_link, store_add_link); |
999 | ||
1000 | static ssize_t show_remove_link(struct most_aim_obj *aim_obj, | |
1001 | struct most_aim_attribute *attr, | |
1002 | char *buf) | |
1003 | { | |
1004 | return snprintf(buf, PAGE_SIZE, "%s\n", aim_obj->remove_link); | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * store_remove_link - store function for remove_link attribute | |
1009 | * @aim_obj: pointer to AIM object | |
1010 | * @attr: its attributes | |
1011 | * @buf: buffer | |
1012 | * @len: buffer length | |
1013 | * | |
1014 | * Example: | |
1015 | * echo -n -e "mdev0:ch0@ep_81\n" >remove_link | |
1016 | */ | |
1017 | static ssize_t store_remove_link(struct most_aim_obj *aim_obj, | |
1018 | struct most_aim_attribute *attr, | |
1019 | const char *buf, | |
1020 | size_t len) | |
1021 | { | |
1022 | struct most_c_obj *c; | |
1023 | char buffer[STRING_SIZE]; | |
1024 | char *mdev; | |
1025 | char *mdev_ch; | |
1026 | int ret; | |
3f78f611 | 1027 | size_t max_len = min_t(size_t, len + 1, STRING_SIZE); |
57562a72 CG |
1028 | |
1029 | strlcpy(buffer, buf, max_len); | |
1030 | strlcpy(aim_obj->remove_link, buf, max_len); | |
1031 | ret = split_string(buffer, &mdev, &mdev_ch, NULL); | |
1032 | if (ret) | |
1033 | return ret; | |
1034 | ||
1035 | c = get_channel_by_name(mdev, mdev_ch); | |
1036 | if (IS_ERR(c)) | |
1037 | return -ENODEV; | |
1038 | ||
44fe5781 CG |
1039 | if (aim_obj->driver->disconnect_channel(c->iface, c->channel_id)) |
1040 | return -EIO; | |
ccfbaee0 CG |
1041 | if (c->aim0.ptr == aim_obj->driver) |
1042 | c->aim0.ptr = NULL; | |
1043 | if (c->aim1.ptr == aim_obj->driver) | |
1044 | c->aim1.ptr = NULL; | |
57562a72 CG |
1045 | return len; |
1046 | } | |
1047 | ||
c942ea7a | 1048 | static struct most_aim_attribute most_aim_attr_remove_link = |
1446ff09 CG |
1049 | __ATTR(remove_link, S_IRUGO | S_IWUSR, show_remove_link, |
1050 | store_remove_link); | |
57562a72 CG |
1051 | |
1052 | static struct attribute *most_aim_def_attrs[] = { | |
1053 | &most_aim_attr_add_link.attr, | |
1054 | &most_aim_attr_remove_link.attr, | |
1055 | NULL, | |
1056 | }; | |
1057 | ||
1058 | static struct kobj_type most_aim_ktype = { | |
1059 | .sysfs_ops = &most_aim_sysfs_ops, | |
1060 | .release = most_aim_release, | |
1061 | .default_attrs = most_aim_def_attrs, | |
1062 | }; | |
1063 | ||
1064 | static struct kset *most_aim_kset; | |
1065 | ||
1066 | /** | |
1067 | * create_most_aim_obj - creates an AIM object | |
1068 | * @name: name of the AIM | |
1069 | * | |
1070 | * This creates an AIM object assigns the proper kset and registers | |
1071 | * it with sysfs. | |
1072 | * Returns a pointer to the object or NULL if something went wrong. | |
1073 | */ | |
1074 | static struct most_aim_obj *create_most_aim_obj(const char *name) | |
1075 | { | |
1076 | struct most_aim_obj *most_aim; | |
1077 | int retval; | |
1078 | ||
1079 | most_aim = kzalloc(sizeof(*most_aim), GFP_KERNEL); | |
1080 | if (!most_aim) | |
1081 | return NULL; | |
1082 | most_aim->kobj.kset = most_aim_kset; | |
1083 | retval = kobject_init_and_add(&most_aim->kobj, &most_aim_ktype, | |
1084 | NULL, "%s", name); | |
1085 | if (retval) { | |
1086 | kobject_put(&most_aim->kobj); | |
1087 | return NULL; | |
1088 | } | |
1089 | kobject_uevent(&most_aim->kobj, KOBJ_ADD); | |
1090 | return most_aim; | |
1091 | } | |
1092 | ||
1093 | /** | |
1094 | * destroy_most_aim_obj - AIM release function | |
1095 | * @p: pointer to AIM object | |
1096 | * | |
1097 | * This decrements the reference counter of the AIM object. If the | |
1098 | * reference count turns zero, its release function will be called. | |
1099 | */ | |
1100 | static void destroy_most_aim_obj(struct most_aim_obj *p) | |
1101 | { | |
1102 | kobject_put(&p->kobj); | |
1103 | } | |
1104 | ||
57562a72 CG |
1105 | /* ___ ___ |
1106 | * ___C O R E___ | |
1107 | */ | |
1108 | ||
1109 | /** | |
1110 | * Instantiation of the MOST bus | |
1111 | */ | |
c942ea7a | 1112 | static struct bus_type most_bus = { |
57562a72 CG |
1113 | .name = "most", |
1114 | }; | |
1115 | ||
1116 | /** | |
1117 | * Instantiation of the core driver | |
1118 | */ | |
c942ea7a | 1119 | static struct device_driver mostcore = { |
57562a72 CG |
1120 | .name = "mostcore", |
1121 | .bus = &most_bus, | |
1122 | }; | |
1123 | ||
1124 | static inline void trash_mbo(struct mbo *mbo) | |
1125 | { | |
1126 | unsigned long flags; | |
1127 | struct most_c_obj *c = mbo->context; | |
1128 | ||
1129 | spin_lock_irqsave(&c->fifo_lock, flags); | |
1130 | list_add(&mbo->list, &c->trash_fifo); | |
1131 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1132 | } | |
1133 | ||
1134 | static struct mbo *get_hdm_mbo(struct most_c_obj *c) | |
1135 | { | |
1136 | unsigned long flags; | |
1137 | struct mbo *mbo; | |
1138 | ||
1139 | spin_lock_irqsave(&c->fifo_lock, flags); | |
1140 | if (c->enqueue_halt || list_empty(&c->halt_fifo)) | |
1141 | mbo = NULL; | |
1142 | else | |
1143 | mbo = list_pop_mbo(&c->halt_fifo); | |
1144 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1145 | return mbo; | |
1146 | } | |
1147 | ||
1148 | static void nq_hdm_mbo(struct mbo *mbo) | |
1149 | { | |
1150 | unsigned long flags; | |
1151 | struct most_c_obj *c = mbo->context; | |
1152 | ||
1153 | spin_lock_irqsave(&c->fifo_lock, flags); | |
1154 | list_add_tail(&mbo->list, &c->halt_fifo); | |
1155 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1156 | wake_up_interruptible(&c->hdm_fifo_wq); | |
1157 | } | |
1158 | ||
1159 | static int hdm_enqueue_thread(void *data) | |
1160 | { | |
1161 | struct most_c_obj *c = data; | |
1162 | struct mbo *mbo; | |
1163 | typeof(c->iface->enqueue) enqueue = c->iface->enqueue; | |
1164 | ||
1165 | while (likely(!kthread_should_stop())) { | |
1166 | wait_event_interruptible(c->hdm_fifo_wq, | |
623d8002 CG |
1167 | (mbo = get_hdm_mbo(c)) || |
1168 | kthread_should_stop()); | |
57562a72 CG |
1169 | |
1170 | if (unlikely(!mbo)) | |
1171 | continue; | |
1172 | ||
1173 | if (c->cfg.direction == MOST_CH_RX) | |
1174 | mbo->buffer_length = c->cfg.buffer_size; | |
1175 | ||
1176 | if (unlikely(enqueue(mbo->ifp, mbo->hdm_channel_id, mbo))) { | |
1177 | pr_err("hdm enqueue failed\n"); | |
1178 | nq_hdm_mbo(mbo); | |
1179 | c->hdm_enqueue_task = NULL; | |
1180 | return 0; | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static int run_enqueue_thread(struct most_c_obj *c, int channel_id) | |
1188 | { | |
1189 | struct task_struct *task = | |
246ed517 SB |
1190 | kthread_run(hdm_enqueue_thread, c, "hdm_fifo_%d", |
1191 | channel_id); | |
57562a72 CG |
1192 | |
1193 | if (IS_ERR(task)) | |
1194 | return PTR_ERR(task); | |
1195 | ||
1196 | c->hdm_enqueue_task = task; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | /** | |
1201 | * arm_mbo - recycle MBO for further usage | |
1202 | * @mbo: buffer object | |
1203 | * | |
1204 | * This puts an MBO back to the list to have it ready for up coming | |
1205 | * tx transactions. | |
1206 | * | |
1207 | * In case the MBO belongs to a channel that recently has been | |
1208 | * poisoned, the MBO is scheduled to be trashed. | |
1209 | * Calls the completion handler of an attached AIM. | |
1210 | */ | |
1211 | static void arm_mbo(struct mbo *mbo) | |
1212 | { | |
1213 | unsigned long flags; | |
1214 | struct most_c_obj *c; | |
1215 | ||
1216 | BUG_ON((!mbo) || (!mbo->context)); | |
1217 | c = mbo->context; | |
1218 | ||
1219 | if (c->is_poisoned) { | |
1220 | trash_mbo(mbo); | |
1221 | return; | |
1222 | } | |
1223 | ||
1224 | spin_lock_irqsave(&c->fifo_lock, flags); | |
71457d48 | 1225 | ++*mbo->num_buffers_ptr; |
57562a72 CG |
1226 | list_add_tail(&mbo->list, &c->fifo); |
1227 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1228 | ||
ccfbaee0 CG |
1229 | if (c->aim0.refs && c->aim0.ptr->tx_completion) |
1230 | c->aim0.ptr->tx_completion(c->iface, c->channel_id); | |
f13f6981 | 1231 | |
ccfbaee0 CG |
1232 | if (c->aim1.refs && c->aim1.ptr->tx_completion) |
1233 | c->aim1.ptr->tx_completion(c->iface, c->channel_id); | |
57562a72 CG |
1234 | } |
1235 | ||
1236 | /** | |
1237 | * arm_mbo_chain - helper function that arms an MBO chain for the HDM | |
1238 | * @c: pointer to interface channel | |
1239 | * @dir: direction of the channel | |
1240 | * @compl: pointer to completion function | |
1241 | * | |
1242 | * This allocates buffer objects including the containing DMA coherent | |
1243 | * buffer and puts them in the fifo. | |
1244 | * Buffers of Rx channels are put in the kthread fifo, hence immediately | |
1245 | * submitted to the HDM. | |
1246 | * | |
1247 | * Returns the number of allocated and enqueued MBOs. | |
1248 | */ | |
c942ea7a AR |
1249 | static int arm_mbo_chain(struct most_c_obj *c, int dir, |
1250 | void (*compl)(struct mbo *)) | |
57562a72 CG |
1251 | { |
1252 | unsigned int i; | |
1253 | int retval; | |
1254 | struct mbo *mbo; | |
2ae07510 | 1255 | u32 coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len; |
57562a72 CG |
1256 | |
1257 | atomic_set(&c->mbo_nq_level, 0); | |
1258 | ||
1259 | for (i = 0; i < c->cfg.num_buffers; i++) { | |
1260 | mbo = kzalloc(sizeof(*mbo), GFP_KERNEL); | |
1261 | if (!mbo) { | |
1262 | pr_info("WARN: Allocation of MBO failed.\n"); | |
1263 | retval = i; | |
1264 | goto _exit; | |
1265 | } | |
1266 | mbo->context = c; | |
1267 | mbo->ifp = c->iface; | |
1268 | mbo->hdm_channel_id = c->channel_id; | |
1269 | mbo->virt_address = dma_alloc_coherent(NULL, | |
1270 | coherent_buf_size, | |
1271 | &mbo->bus_address, | |
1272 | GFP_KERNEL); | |
1273 | if (!mbo->virt_address) { | |
1274 | pr_info("WARN: No DMA coherent buffer.\n"); | |
1275 | retval = i; | |
1276 | goto _error1; | |
1277 | } | |
1278 | mbo->complete = compl; | |
71457d48 | 1279 | mbo->num_buffers_ptr = &dummy_num_buffers; |
57562a72 CG |
1280 | if (dir == MOST_CH_RX) { |
1281 | nq_hdm_mbo(mbo); | |
1282 | atomic_inc(&c->mbo_nq_level); | |
1283 | } else { | |
1284 | arm_mbo(mbo); | |
1285 | } | |
1286 | } | |
1287 | return i; | |
1288 | ||
1289 | _error1: | |
1290 | kfree(mbo); | |
1291 | _exit: | |
1292 | return retval; | |
1293 | } | |
1294 | ||
1295 | /** | |
1296 | * most_submit_mbo - submits an MBO to fifo | |
1297 | * @mbo: pointer to the MBO | |
1298 | * | |
1299 | */ | |
1300 | int most_submit_mbo(struct mbo *mbo) | |
1301 | { | |
57562a72 CG |
1302 | if (unlikely((!mbo) || (!mbo->context))) { |
1303 | pr_err("Bad MBO or missing channel reference\n"); | |
1304 | return -EINVAL; | |
1305 | } | |
57562a72 CG |
1306 | |
1307 | nq_hdm_mbo(mbo); | |
1308 | return 0; | |
1309 | } | |
1310 | EXPORT_SYMBOL_GPL(most_submit_mbo); | |
1311 | ||
1312 | /** | |
1313 | * most_write_completion - write completion handler | |
1314 | * @mbo: pointer to MBO | |
1315 | * | |
1316 | * This recycles the MBO for further usage. In case the channel has been | |
1317 | * poisoned, the MBO is scheduled to be trashed. | |
1318 | */ | |
1319 | static void most_write_completion(struct mbo *mbo) | |
1320 | { | |
1321 | struct most_c_obj *c; | |
1322 | ||
1323 | BUG_ON((!mbo) || (!mbo->context)); | |
1324 | ||
1325 | c = mbo->context; | |
1326 | if (mbo->status == MBO_E_INVAL) | |
1327 | pr_info("WARN: Tx MBO status: invalid\n"); | |
ec58d2a8 | 1328 | if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) |
57562a72 CG |
1329 | trash_mbo(mbo); |
1330 | else | |
1331 | arm_mbo(mbo); | |
1332 | } | |
1333 | ||
1334 | /** | |
1335 | * get_channel_by_iface - get pointer to channel object | |
1336 | * @iface: pointer to interface instance | |
1337 | * @id: channel ID | |
1338 | * | |
1339 | * This retrieves a pointer to a channel of the given interface and channel ID. | |
1340 | */ | |
1341 | static struct | |
1342 | most_c_obj *get_channel_by_iface(struct most_interface *iface, int id) | |
1343 | { | |
1344 | struct most_inst_obj *i; | |
1345 | ||
1346 | if (unlikely(!iface)) { | |
1347 | pr_err("Bad interface\n"); | |
1348 | return NULL; | |
1349 | } | |
1350 | if (unlikely((id < 0) || (id >= iface->num_channels))) { | |
1351 | pr_err("Channel index (%d) out of range\n", id); | |
1352 | return NULL; | |
1353 | } | |
1354 | i = iface->priv; | |
1355 | if (unlikely(!i)) { | |
1356 | pr_err("interface is not registered\n"); | |
1357 | return NULL; | |
1358 | } | |
1359 | return i->channel[id]; | |
1360 | } | |
1361 | ||
cdc293d5 | 1362 | int channel_has_mbo(struct most_interface *iface, int id, struct most_aim *aim) |
aac997df CG |
1363 | { |
1364 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1365 | unsigned long flags; | |
1366 | int empty; | |
1367 | ||
1368 | if (unlikely(!c)) | |
1369 | return -EINVAL; | |
1370 | ||
cdc293d5 CG |
1371 | if (c->aim0.refs && c->aim1.refs && |
1372 | ((aim == c->aim0.ptr && c->aim0.num_buffers <= 0) || | |
1373 | (aim == c->aim1.ptr && c->aim1.num_buffers <= 0))) | |
1374 | return 0; | |
1375 | ||
aac997df CG |
1376 | spin_lock_irqsave(&c->fifo_lock, flags); |
1377 | empty = list_empty(&c->fifo); | |
1378 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1379 | return !empty; | |
1380 | } | |
1381 | EXPORT_SYMBOL_GPL(channel_has_mbo); | |
1382 | ||
57562a72 CG |
1383 | /** |
1384 | * most_get_mbo - get pointer to an MBO of pool | |
1385 | * @iface: pointer to interface instance | |
1386 | * @id: channel ID | |
1387 | * | |
1388 | * This attempts to get a free buffer out of the channel fifo. | |
1389 | * Returns a pointer to MBO on success or NULL otherwise. | |
1390 | */ | |
71457d48 CG |
1391 | struct mbo *most_get_mbo(struct most_interface *iface, int id, |
1392 | struct most_aim *aim) | |
57562a72 CG |
1393 | { |
1394 | struct mbo *mbo; | |
1395 | struct most_c_obj *c; | |
1396 | unsigned long flags; | |
71457d48 | 1397 | int *num_buffers_ptr; |
57562a72 CG |
1398 | |
1399 | c = get_channel_by_iface(iface, id); | |
1400 | if (unlikely(!c)) | |
1401 | return NULL; | |
71457d48 | 1402 | |
ccfbaee0 CG |
1403 | if (c->aim0.refs && c->aim1.refs && |
1404 | ((aim == c->aim0.ptr && c->aim0.num_buffers <= 0) || | |
1405 | (aim == c->aim1.ptr && c->aim1.num_buffers <= 0))) | |
71457d48 CG |
1406 | return NULL; |
1407 | ||
ccfbaee0 CG |
1408 | if (aim == c->aim0.ptr) |
1409 | num_buffers_ptr = &c->aim0.num_buffers; | |
1410 | else if (aim == c->aim1.ptr) | |
1411 | num_buffers_ptr = &c->aim1.num_buffers; | |
71457d48 CG |
1412 | else |
1413 | num_buffers_ptr = &dummy_num_buffers; | |
1414 | ||
57562a72 CG |
1415 | spin_lock_irqsave(&c->fifo_lock, flags); |
1416 | if (list_empty(&c->fifo)) { | |
1417 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1418 | return NULL; | |
1419 | } | |
1420 | mbo = list_pop_mbo(&c->fifo); | |
71457d48 | 1421 | --*num_buffers_ptr; |
57562a72 | 1422 | spin_unlock_irqrestore(&c->fifo_lock, flags); |
71457d48 CG |
1423 | |
1424 | mbo->num_buffers_ptr = num_buffers_ptr; | |
57562a72 CG |
1425 | mbo->buffer_length = c->cfg.buffer_size; |
1426 | return mbo; | |
1427 | } | |
1428 | EXPORT_SYMBOL_GPL(most_get_mbo); | |
1429 | ||
57562a72 CG |
1430 | /** |
1431 | * most_put_mbo - return buffer to pool | |
1432 | * @mbo: buffer object | |
1433 | */ | |
1434 | void most_put_mbo(struct mbo *mbo) | |
1435 | { | |
6ed90e36 | 1436 | struct most_c_obj *c = mbo->context; |
57562a72 | 1437 | |
57562a72 CG |
1438 | if (c->cfg.direction == MOST_CH_TX) { |
1439 | arm_mbo(mbo); | |
1440 | return; | |
1441 | } | |
1442 | nq_hdm_mbo(mbo); | |
1443 | atomic_inc(&c->mbo_nq_level); | |
1444 | } | |
1445 | EXPORT_SYMBOL_GPL(most_put_mbo); | |
1446 | ||
1447 | /** | |
1448 | * most_read_completion - read completion handler | |
1449 | * @mbo: pointer to MBO | |
1450 | * | |
1451 | * This function is called by the HDM when data has been received from the | |
1452 | * hardware and copied to the buffer of the MBO. | |
1453 | * | |
1454 | * In case the channel has been poisoned it puts the buffer in the trash queue. | |
1455 | * Otherwise, it passes the buffer to an AIM for further processing. | |
1456 | */ | |
1457 | static void most_read_completion(struct mbo *mbo) | |
1458 | { | |
f13f6981 | 1459 | struct most_c_obj *c = mbo->context; |
57562a72 | 1460 | |
f13f6981 CG |
1461 | if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) { |
1462 | trash_mbo(mbo); | |
1463 | return; | |
1464 | } | |
57562a72 CG |
1465 | |
1466 | if (mbo->status == MBO_E_INVAL) { | |
1467 | nq_hdm_mbo(mbo); | |
1468 | atomic_inc(&c->mbo_nq_level); | |
1469 | return; | |
1470 | } | |
1471 | ||
1472 | if (atomic_sub_and_test(1, &c->mbo_nq_level)) { | |
1473 | pr_info("WARN: rx device out of buffers\n"); | |
1474 | c->is_starving = 1; | |
1475 | } | |
1476 | ||
ccfbaee0 CG |
1477 | if (c->aim0.refs && c->aim0.ptr->rx_completion && |
1478 | c->aim0.ptr->rx_completion(mbo) == 0) | |
57562a72 | 1479 | return; |
f13f6981 | 1480 | |
ccfbaee0 CG |
1481 | if (c->aim1.refs && c->aim1.ptr->rx_completion && |
1482 | c->aim1.ptr->rx_completion(mbo) == 0) | |
57562a72 | 1483 | return; |
f13f6981 CG |
1484 | |
1485 | most_put_mbo(mbo); | |
57562a72 CG |
1486 | } |
1487 | ||
1488 | /** | |
1489 | * most_start_channel - prepares a channel for communication | |
1490 | * @iface: pointer to interface instance | |
1491 | * @id: channel ID | |
1492 | * | |
1493 | * This prepares the channel for usage. Cross-checks whether the | |
1494 | * channel's been properly configured. | |
1495 | * | |
1496 | * Returns 0 on success or error code otherwise. | |
1497 | */ | |
f13f6981 CG |
1498 | int most_start_channel(struct most_interface *iface, int id, |
1499 | struct most_aim *aim) | |
57562a72 CG |
1500 | { |
1501 | int num_buffer; | |
1502 | int ret; | |
1503 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1504 | ||
1505 | if (unlikely(!c)) | |
1506 | return -EINVAL; | |
1507 | ||
f13f6981 | 1508 | mutex_lock(&c->start_mutex); |
ccfbaee0 | 1509 | if (c->aim0.refs + c->aim1.refs > 0) |
f13f6981 | 1510 | goto out; /* already started by other aim */ |
57562a72 CG |
1511 | |
1512 | if (!try_module_get(iface->mod)) { | |
1513 | pr_info("failed to acquire HDM lock\n"); | |
f13f6981 | 1514 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1515 | return -ENOLCK; |
1516 | } | |
57562a72 CG |
1517 | |
1518 | c->cfg.extra_len = 0; | |
1519 | if (c->iface->configure(c->iface, c->channel_id, &c->cfg)) { | |
1520 | pr_info("channel configuration failed. Go check settings...\n"); | |
1521 | ret = -EINVAL; | |
1522 | goto error; | |
1523 | } | |
1524 | ||
1525 | init_waitqueue_head(&c->hdm_fifo_wq); | |
1526 | ||
1527 | if (c->cfg.direction == MOST_CH_RX) | |
1528 | num_buffer = arm_mbo_chain(c, c->cfg.direction, | |
1529 | most_read_completion); | |
1530 | else | |
1531 | num_buffer = arm_mbo_chain(c, c->cfg.direction, | |
1532 | most_write_completion); | |
47af41b0 | 1533 | if (unlikely(!num_buffer)) { |
57562a72 CG |
1534 | pr_info("failed to allocate memory\n"); |
1535 | ret = -ENOMEM; | |
1536 | goto error; | |
1537 | } | |
1538 | ||
1539 | ret = run_enqueue_thread(c, id); | |
1540 | if (ret) | |
1541 | goto error; | |
1542 | ||
57562a72 | 1543 | c->is_starving = 0; |
ccfbaee0 CG |
1544 | c->aim0.num_buffers = c->cfg.num_buffers / 2; |
1545 | c->aim1.num_buffers = c->cfg.num_buffers - c->aim0.num_buffers; | |
57562a72 | 1546 | atomic_set(&c->mbo_ref, num_buffer); |
f13f6981 CG |
1547 | |
1548 | out: | |
ccfbaee0 CG |
1549 | if (aim == c->aim0.ptr) |
1550 | c->aim0.refs++; | |
1551 | if (aim == c->aim1.ptr) | |
1552 | c->aim1.refs++; | |
f13f6981 | 1553 | mutex_unlock(&c->start_mutex); |
57562a72 | 1554 | return 0; |
f13f6981 | 1555 | |
57562a72 | 1556 | error: |
e23afff9 | 1557 | module_put(iface->mod); |
f13f6981 | 1558 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1559 | return ret; |
1560 | } | |
1561 | EXPORT_SYMBOL_GPL(most_start_channel); | |
1562 | ||
1563 | /** | |
1564 | * most_stop_channel - stops a running channel | |
1565 | * @iface: pointer to interface instance | |
1566 | * @id: channel ID | |
1567 | */ | |
f13f6981 CG |
1568 | int most_stop_channel(struct most_interface *iface, int id, |
1569 | struct most_aim *aim) | |
57562a72 CG |
1570 | { |
1571 | struct most_c_obj *c; | |
1572 | ||
1573 | if (unlikely((!iface) || (id >= iface->num_channels) || (id < 0))) { | |
1574 | pr_err("Bad interface or index out of range\n"); | |
1575 | return -EINVAL; | |
1576 | } | |
1577 | c = get_channel_by_iface(iface, id); | |
1578 | if (unlikely(!c)) | |
1579 | return -EINVAL; | |
1580 | ||
f13f6981 | 1581 | mutex_lock(&c->start_mutex); |
ccfbaee0 | 1582 | if (c->aim0.refs + c->aim1.refs >= 2) |
f13f6981 | 1583 | goto out; |
57562a72 | 1584 | |
57562a72 CG |
1585 | if (c->hdm_enqueue_task) |
1586 | kthread_stop(c->hdm_enqueue_task); | |
1587 | c->hdm_enqueue_task = NULL; | |
57562a72 | 1588 | |
9cda3007 | 1589 | if (iface->mod) |
57562a72 | 1590 | module_put(iface->mod); |
57562a72 CG |
1591 | |
1592 | c->is_poisoned = true; | |
1593 | if (c->iface->poison_channel(c->iface, c->channel_id)) { | |
1594 | pr_err("Cannot stop channel %d of mdev %s\n", c->channel_id, | |
1595 | c->iface->description); | |
f13f6981 | 1596 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1597 | return -EAGAIN; |
1598 | } | |
1599 | flush_trash_fifo(c); | |
1600 | flush_channel_fifos(c); | |
1601 | ||
1602 | #ifdef CMPL_INTERRUPTIBLE | |
1603 | if (wait_for_completion_interruptible(&c->cleanup)) { | |
1604 | pr_info("Interrupted while clean up ch %d\n", c->channel_id); | |
f13f6981 | 1605 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1606 | return -EINTR; |
1607 | } | |
1608 | #else | |
1609 | wait_for_completion(&c->cleanup); | |
1610 | #endif | |
1611 | c->is_poisoned = false; | |
f13f6981 CG |
1612 | |
1613 | out: | |
ccfbaee0 CG |
1614 | if (aim == c->aim0.ptr) |
1615 | c->aim0.refs--; | |
1616 | if (aim == c->aim1.ptr) | |
1617 | c->aim1.refs--; | |
f13f6981 | 1618 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1619 | return 0; |
1620 | } | |
1621 | EXPORT_SYMBOL_GPL(most_stop_channel); | |
1622 | ||
1623 | /** | |
1624 | * most_register_aim - registers an AIM (driver) with the core | |
1625 | * @aim: instance of AIM to be registered | |
1626 | */ | |
1627 | int most_register_aim(struct most_aim *aim) | |
1628 | { | |
1629 | struct most_aim_obj *aim_obj; | |
1630 | ||
1631 | if (!aim) { | |
1632 | pr_err("Bad driver\n"); | |
1633 | return -EINVAL; | |
1634 | } | |
1635 | aim_obj = create_most_aim_obj(aim->name); | |
1636 | if (!aim_obj) { | |
1637 | pr_info("failed to alloc driver object\n"); | |
1638 | return -ENOMEM; | |
1639 | } | |
1640 | aim_obj->driver = aim; | |
1641 | aim->context = aim_obj; | |
1642 | pr_info("registered new application interfacing module %s\n", | |
1643 | aim->name); | |
1644 | list_add_tail(&aim_obj->list, &aim_list); | |
1645 | return 0; | |
1646 | } | |
1647 | EXPORT_SYMBOL_GPL(most_register_aim); | |
1648 | ||
1649 | /** | |
1650 | * most_deregister_aim - deregisters an AIM (driver) with the core | |
1651 | * @aim: AIM to be removed | |
1652 | */ | |
1653 | int most_deregister_aim(struct most_aim *aim) | |
1654 | { | |
1655 | struct most_aim_obj *aim_obj; | |
1656 | struct most_c_obj *c, *tmp; | |
1657 | struct most_inst_obj *i, *i_tmp; | |
1658 | ||
1659 | if (!aim) { | |
1660 | pr_err("Bad driver\n"); | |
1661 | return -EINVAL; | |
1662 | } | |
1663 | ||
1664 | aim_obj = aim->context; | |
1665 | if (!aim_obj) { | |
1666 | pr_info("driver not registered.\n"); | |
1667 | return -EINVAL; | |
1668 | } | |
1669 | list_for_each_entry_safe(i, i_tmp, &instance_list, list) { | |
1670 | list_for_each_entry_safe(c, tmp, &i->channel_list, list) { | |
ccfbaee0 | 1671 | if (c->aim0.ptr == aim || c->aim1.ptr == aim) |
57562a72 CG |
1672 | aim->disconnect_channel( |
1673 | c->iface, c->channel_id); | |
ccfbaee0 CG |
1674 | if (c->aim0.ptr == aim) |
1675 | c->aim0.ptr = NULL; | |
1676 | if (c->aim1.ptr == aim) | |
1677 | c->aim1.ptr = NULL; | |
57562a72 CG |
1678 | } |
1679 | } | |
1680 | list_del(&aim_obj->list); | |
1681 | destroy_most_aim_obj(aim_obj); | |
1682 | pr_info("deregistering application interfacing module %s\n", aim->name); | |
1683 | return 0; | |
1684 | } | |
1685 | EXPORT_SYMBOL_GPL(most_deregister_aim); | |
1686 | ||
1687 | /** | |
1688 | * most_register_interface - registers an interface with core | |
1689 | * @iface: pointer to the instance of the interface description. | |
1690 | * | |
1691 | * Allocates and initializes a new interface instance and all of its channels. | |
1692 | * Returns a pointer to kobject or an error pointer. | |
1693 | */ | |
1694 | struct kobject *most_register_interface(struct most_interface *iface) | |
1695 | { | |
1696 | unsigned int i; | |
1697 | int id; | |
1698 | char name[STRING_SIZE]; | |
1699 | char channel_name[STRING_SIZE]; | |
1700 | struct most_c_obj *c; | |
1701 | struct most_inst_obj *inst; | |
1702 | ||
1703 | if (!iface || !iface->enqueue || !iface->configure || | |
1704 | !iface->poison_channel || (iface->num_channels > MAX_CHANNELS)) { | |
1705 | pr_err("Bad interface or channel overflow\n"); | |
1706 | return ERR_PTR(-EINVAL); | |
1707 | } | |
1708 | ||
1709 | id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL); | |
1710 | if (id < 0) { | |
1711 | pr_info("Failed to alloc mdev ID\n"); | |
1712 | return ERR_PTR(id); | |
1713 | } | |
1714 | snprintf(name, STRING_SIZE, "mdev%d", id); | |
1715 | ||
1716 | inst = create_most_inst_obj(name); | |
1717 | if (!inst) { | |
1718 | pr_info("Failed to allocate interface instance\n"); | |
b7382d44 | 1719 | ida_simple_remove(&mdev_id, id); |
57562a72 CG |
1720 | return ERR_PTR(-ENOMEM); |
1721 | } | |
1722 | ||
1723 | iface->priv = inst; | |
1724 | INIT_LIST_HEAD(&inst->channel_list); | |
1725 | inst->iface = iface; | |
1726 | inst->dev_id = id; | |
57562a72 CG |
1727 | list_add_tail(&inst->list, &instance_list); |
1728 | ||
1729 | for (i = 0; i < iface->num_channels; i++) { | |
1730 | const char *name_suffix = iface->channel_vector[i].name_suffix; | |
1731 | ||
1732 | if (!name_suffix) | |
1733 | snprintf(channel_name, STRING_SIZE, "ch%d", i); | |
1734 | else if (name_suffix[0] == '@') | |
1735 | snprintf(channel_name, STRING_SIZE, "ch%d%s", i, | |
1736 | name_suffix); | |
1737 | else | |
1738 | snprintf(channel_name, STRING_SIZE, "%s", name_suffix); | |
1739 | ||
1740 | /* this increments the reference count of this instance */ | |
1741 | c = create_most_c_obj(channel_name, &inst->kobj); | |
1742 | if (!c) | |
1743 | goto free_instance; | |
1744 | inst->channel[i] = c; | |
1745 | c->is_starving = 0; | |
1746 | c->iface = iface; | |
1747 | c->inst = inst; | |
1748 | c->channel_id = i; | |
1749 | c->keep_mbo = false; | |
1750 | c->enqueue_halt = false; | |
1751 | c->is_poisoned = false; | |
57562a72 CG |
1752 | c->cfg.direction = 0; |
1753 | c->cfg.data_type = 0; | |
1754 | c->cfg.num_buffers = 0; | |
1755 | c->cfg.buffer_size = 0; | |
1756 | c->cfg.subbuffer_size = 0; | |
1757 | c->cfg.packets_per_xact = 0; | |
1758 | spin_lock_init(&c->fifo_lock); | |
1759 | INIT_LIST_HEAD(&c->fifo); | |
1760 | INIT_LIST_HEAD(&c->trash_fifo); | |
1761 | INIT_LIST_HEAD(&c->halt_fifo); | |
1762 | init_completion(&c->cleanup); | |
1763 | atomic_set(&c->mbo_ref, 0); | |
f13f6981 | 1764 | mutex_init(&c->start_mutex); |
57562a72 CG |
1765 | list_add_tail(&c->list, &inst->channel_list); |
1766 | } | |
1767 | pr_info("registered new MOST device mdev%d (%s)\n", | |
1768 | inst->dev_id, iface->description); | |
1769 | return &inst->kobj; | |
1770 | ||
1771 | free_instance: | |
1772 | pr_info("Failed allocate channel(s)\n"); | |
1773 | list_del(&inst->list); | |
b7382d44 | 1774 | ida_simple_remove(&mdev_id, id); |
57562a72 CG |
1775 | destroy_most_inst_obj(inst); |
1776 | return ERR_PTR(-ENOMEM); | |
1777 | } | |
1778 | EXPORT_SYMBOL_GPL(most_register_interface); | |
1779 | ||
1780 | /** | |
1781 | * most_deregister_interface - deregisters an interface with core | |
1782 | * @iface: pointer to the interface instance description. | |
1783 | * | |
1784 | * Before removing an interface instance from the list, all running | |
1785 | * channels are stopped and poisoned. | |
1786 | */ | |
1787 | void most_deregister_interface(struct most_interface *iface) | |
1788 | { | |
1789 | struct most_inst_obj *i = iface->priv; | |
1790 | struct most_c_obj *c; | |
1791 | ||
57562a72 CG |
1792 | if (unlikely(!i)) { |
1793 | pr_info("Bad Interface\n"); | |
57562a72 CG |
1794 | return; |
1795 | } | |
1796 | pr_info("deregistering MOST device %s (%s)\n", i->kobj.name, | |
1797 | iface->description); | |
1798 | ||
a0fceb1f CG |
1799 | list_for_each_entry(c, &i->channel_list, list) { |
1800 | if (c->aim0.ptr) | |
1801 | c->aim0.ptr->disconnect_channel(c->iface, | |
1802 | c->channel_id); | |
1803 | if (c->aim1.ptr) | |
1804 | c->aim1.ptr->disconnect_channel(c->iface, | |
1805 | c->channel_id); | |
1806 | c->aim0.ptr = NULL; | |
1807 | c->aim1.ptr = NULL; | |
1808 | } | |
1809 | ||
57562a72 CG |
1810 | ida_simple_remove(&mdev_id, i->dev_id); |
1811 | list_del(&i->list); | |
1812 | destroy_most_inst_obj(i); | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(most_deregister_interface); | |
1815 | ||
1816 | /** | |
1817 | * most_stop_enqueue - prevents core from enqueueing MBOs | |
1818 | * @iface: pointer to interface | |
1819 | * @id: channel id | |
1820 | * | |
1821 | * This is called by an HDM that _cannot_ attend to its duties and | |
1822 | * is imminent to get run over by the core. The core is not going to | |
1823 | * enqueue any further packets unless the flagging HDM calls | |
1824 | * most_resume enqueue(). | |
1825 | */ | |
1826 | void most_stop_enqueue(struct most_interface *iface, int id) | |
1827 | { | |
1828 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1829 | ||
1830 | if (likely(c)) | |
1831 | c->enqueue_halt = true; | |
1832 | } | |
1833 | EXPORT_SYMBOL_GPL(most_stop_enqueue); | |
1834 | ||
1835 | /** | |
1836 | * most_resume_enqueue - allow core to enqueue MBOs again | |
1837 | * @iface: pointer to interface | |
1838 | * @id: channel id | |
1839 | * | |
1840 | * This clears the enqueue halt flag and enqueues all MBOs currently | |
1841 | * sitting in the wait fifo. | |
1842 | */ | |
1843 | void most_resume_enqueue(struct most_interface *iface, int id) | |
1844 | { | |
1845 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1846 | ||
1847 | if (unlikely(!c)) | |
1848 | return; | |
1849 | c->enqueue_halt = false; | |
1850 | ||
1851 | wake_up_interruptible(&c->hdm_fifo_wq); | |
1852 | } | |
1853 | EXPORT_SYMBOL_GPL(most_resume_enqueue); | |
1854 | ||
1855 | static int __init most_init(void) | |
1856 | { | |
1857 | pr_info("init()\n"); | |
1858 | INIT_LIST_HEAD(&instance_list); | |
1859 | INIT_LIST_HEAD(&aim_list); | |
57562a72 CG |
1860 | ida_init(&mdev_id); |
1861 | ||
1862 | if (bus_register(&most_bus)) { | |
1863 | pr_info("Cannot register most bus\n"); | |
1864 | goto exit; | |
1865 | } | |
1866 | ||
1867 | most_class = class_create(THIS_MODULE, "most"); | |
1868 | if (IS_ERR(most_class)) { | |
1869 | pr_info("No udev support.\n"); | |
1870 | goto exit_bus; | |
1871 | } | |
1872 | if (driver_register(&mostcore)) { | |
1873 | pr_info("Cannot register core driver\n"); | |
1874 | goto exit_class; | |
1875 | } | |
1876 | ||
1877 | class_glue_dir = | |
1878 | device_create(most_class, NULL, 0, NULL, "mostcore"); | |
17ac98ac | 1879 | if (IS_ERR(class_glue_dir)) |
57562a72 CG |
1880 | goto exit_driver; |
1881 | ||
1882 | most_aim_kset = | |
1883 | kset_create_and_add("aims", NULL, &class_glue_dir->kobj); | |
1884 | if (!most_aim_kset) | |
1885 | goto exit_class_container; | |
1886 | ||
1887 | most_inst_kset = | |
1888 | kset_create_and_add("devices", NULL, &class_glue_dir->kobj); | |
1889 | if (!most_inst_kset) | |
1890 | goto exit_driver_kset; | |
1891 | ||
1892 | return 0; | |
1893 | ||
1894 | exit_driver_kset: | |
1895 | kset_unregister(most_aim_kset); | |
1896 | exit_class_container: | |
1897 | device_destroy(most_class, 0); | |
1898 | exit_driver: | |
1899 | driver_unregister(&mostcore); | |
1900 | exit_class: | |
1901 | class_destroy(most_class); | |
1902 | exit_bus: | |
1903 | bus_unregister(&most_bus); | |
1904 | exit: | |
1905 | return -ENOMEM; | |
1906 | } | |
1907 | ||
1908 | static void __exit most_exit(void) | |
1909 | { | |
1910 | struct most_inst_obj *i, *i_tmp; | |
1911 | struct most_aim_obj *d, *d_tmp; | |
1912 | ||
1913 | pr_info("exit core module\n"); | |
1914 | list_for_each_entry_safe(d, d_tmp, &aim_list, list) { | |
1915 | destroy_most_aim_obj(d); | |
1916 | } | |
1917 | ||
1918 | list_for_each_entry_safe(i, i_tmp, &instance_list, list) { | |
1919 | list_del(&i->list); | |
1920 | destroy_most_inst_obj(i); | |
1921 | } | |
1922 | kset_unregister(most_inst_kset); | |
1923 | kset_unregister(most_aim_kset); | |
1924 | device_destroy(most_class, 0); | |
1925 | driver_unregister(&mostcore); | |
1926 | class_destroy(most_class); | |
1927 | bus_unregister(&most_bus); | |
1928 | ida_destroy(&mdev_id); | |
1929 | } | |
1930 | ||
1931 | module_init(most_init); | |
1932 | module_exit(most_exit); | |
1933 | MODULE_LICENSE("GPL"); | |
1934 | MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>"); | |
1935 | MODULE_DESCRIPTION("Core module of stacked MOST Linux driver"); |