Commit | Line | Data |
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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; | |
99d75346 | 36 | static struct device *core_dev; |
57562a72 | 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; |
bf9503f1 | 54 | struct mutex nq_mutex; /* nq thread synchronization */ |
57562a72 CG |
55 | int is_starving; |
56 | struct most_interface *iface; | |
57 | struct most_inst_obj *inst; | |
58 | struct most_channel_config cfg; | |
59 | bool keep_mbo; | |
60 | bool enqueue_halt; | |
61 | struct list_head fifo; | |
62 | spinlock_t fifo_lock; | |
63 | struct list_head halt_fifo; | |
64 | struct list_head list; | |
ccfbaee0 CG |
65 | struct most_c_aim_obj aim0; |
66 | struct most_c_aim_obj aim1; | |
57562a72 CG |
67 | struct list_head trash_fifo; |
68 | struct task_struct *hdm_enqueue_task; | |
57562a72 CG |
69 | wait_queue_head_t hdm_fifo_wq; |
70 | }; | |
9cbe5aa6 | 71 | |
57562a72 CG |
72 | #define to_c_obj(d) container_of(d, struct most_c_obj, kobj) |
73 | ||
74 | struct most_inst_obj { | |
75 | int dev_id; | |
57562a72 CG |
76 | struct most_interface *iface; |
77 | struct list_head channel_list; | |
78 | struct most_c_obj *channel[MAX_CHANNELS]; | |
79 | struct kobject kobj; | |
80 | struct list_head list; | |
81 | }; | |
9cbe5aa6 | 82 | |
e7f2b70f HPGE |
83 | static const struct { |
84 | int most_ch_data_type; | |
85 | char *name; | |
86 | } ch_data_type[] = { { MOST_CH_CONTROL, "control\n" }, | |
87 | { MOST_CH_ASYNC, "async\n" }, | |
88 | { MOST_CH_SYNC, "sync\n" }, | |
89 | { MOST_CH_ISOC_AVP, "isoc_avp\n"} }; | |
90 | ||
57562a72 CG |
91 | #define to_inst_obj(d) container_of(d, struct most_inst_obj, kobj) |
92 | ||
93 | /** | |
94 | * list_pop_mbo - retrieves the first MBO of the list and removes it | |
95 | * @ptr: the list head to grab the MBO from. | |
96 | */ | |
97 | #define list_pop_mbo(ptr) \ | |
98 | ({ \ | |
99 | struct mbo *_mbo = list_first_entry(ptr, struct mbo, list); \ | |
100 | list_del(&_mbo->list); \ | |
101 | _mbo; \ | |
102 | }) | |
103 | ||
57562a72 CG |
104 | /* ___ ___ |
105 | * ___C H A N N E L___ | |
106 | */ | |
107 | ||
108 | /** | |
109 | * struct most_c_attr - to access the attributes of a channel object | |
110 | * @attr: attributes of a channel | |
111 | * @show: pointer to the show function | |
112 | * @store: pointer to the store function | |
113 | */ | |
114 | struct most_c_attr { | |
115 | struct attribute attr; | |
116 | ssize_t (*show)(struct most_c_obj *d, | |
117 | struct most_c_attr *attr, | |
118 | char *buf); | |
119 | ssize_t (*store)(struct most_c_obj *d, | |
120 | struct most_c_attr *attr, | |
121 | const char *buf, | |
122 | size_t count); | |
123 | }; | |
9cbe5aa6 | 124 | |
57562a72 CG |
125 | #define to_channel_attr(a) container_of(a, struct most_c_attr, attr) |
126 | ||
127 | #define MOST_CHNL_ATTR(_name, _mode, _show, _store) \ | |
128 | struct most_c_attr most_chnl_attr_##_name = \ | |
129 | __ATTR(_name, _mode, _show, _store) | |
130 | ||
131 | /** | |
132 | * channel_attr_show - show function of channel object | |
133 | * @kobj: pointer to its kobject | |
134 | * @attr: pointer to its attributes | |
135 | * @buf: buffer | |
136 | */ | |
137 | static ssize_t channel_attr_show(struct kobject *kobj, struct attribute *attr, | |
138 | char *buf) | |
139 | { | |
140 | struct most_c_attr *channel_attr = to_channel_attr(attr); | |
141 | struct most_c_obj *c_obj = to_c_obj(kobj); | |
142 | ||
143 | if (!channel_attr->show) | |
144 | return -EIO; | |
145 | ||
146 | return channel_attr->show(c_obj, channel_attr, buf); | |
147 | } | |
148 | ||
149 | /** | |
150 | * channel_attr_store - store function of channel object | |
151 | * @kobj: pointer to its kobject | |
152 | * @attr: pointer to its attributes | |
153 | * @buf: buffer | |
154 | * @len: length of buffer | |
155 | */ | |
156 | static ssize_t channel_attr_store(struct kobject *kobj, | |
157 | struct attribute *attr, | |
158 | const char *buf, | |
159 | size_t len) | |
160 | { | |
161 | struct most_c_attr *channel_attr = to_channel_attr(attr); | |
162 | struct most_c_obj *c_obj = to_c_obj(kobj); | |
163 | ||
164 | if (!channel_attr->store) | |
165 | return -EIO; | |
166 | return channel_attr->store(c_obj, channel_attr, buf, len); | |
167 | } | |
168 | ||
169 | static const struct sysfs_ops most_channel_sysfs_ops = { | |
170 | .show = channel_attr_show, | |
171 | .store = channel_attr_store, | |
172 | }; | |
173 | ||
174 | /** | |
175 | * most_free_mbo_coherent - free an MBO and its coherent buffer | |
176 | * @mbo: buffer to be released | |
177 | * | |
178 | */ | |
179 | static void most_free_mbo_coherent(struct mbo *mbo) | |
180 | { | |
181 | struct most_c_obj *c = mbo->context; | |
182 | u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len; | |
183 | ||
184 | dma_free_coherent(NULL, coherent_buf_size, mbo->virt_address, | |
185 | mbo->bus_address); | |
186 | kfree(mbo); | |
187 | if (atomic_sub_and_test(1, &c->mbo_ref)) | |
188 | complete(&c->cleanup); | |
189 | } | |
190 | ||
191 | /** | |
192 | * flush_channel_fifos - clear the channel fifos | |
193 | * @c: pointer to channel object | |
194 | */ | |
c942ea7a | 195 | static void flush_channel_fifos(struct most_c_obj *c) |
57562a72 CG |
196 | { |
197 | unsigned long flags, hf_flags; | |
198 | struct mbo *mbo, *tmp; | |
199 | ||
200 | if (list_empty(&c->fifo) && list_empty(&c->halt_fifo)) | |
201 | return; | |
202 | ||
203 | spin_lock_irqsave(&c->fifo_lock, flags); | |
204 | list_for_each_entry_safe(mbo, tmp, &c->fifo, list) { | |
205 | list_del(&mbo->list); | |
206 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
0834be6c | 207 | most_free_mbo_coherent(mbo); |
57562a72 CG |
208 | spin_lock_irqsave(&c->fifo_lock, flags); |
209 | } | |
210 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
211 | ||
212 | spin_lock_irqsave(&c->fifo_lock, hf_flags); | |
213 | list_for_each_entry_safe(mbo, tmp, &c->halt_fifo, list) { | |
214 | list_del(&mbo->list); | |
215 | spin_unlock_irqrestore(&c->fifo_lock, hf_flags); | |
0834be6c | 216 | most_free_mbo_coherent(mbo); |
57562a72 CG |
217 | spin_lock_irqsave(&c->fifo_lock, hf_flags); |
218 | } | |
219 | spin_unlock_irqrestore(&c->fifo_lock, hf_flags); | |
220 | ||
221 | if (unlikely((!list_empty(&c->fifo) || !list_empty(&c->halt_fifo)))) | |
222 | pr_info("WARN: fifo | trash fifo not empty\n"); | |
223 | } | |
224 | ||
225 | /** | |
226 | * flush_trash_fifo - clear the trash fifo | |
227 | * @c: pointer to channel object | |
228 | */ | |
229 | static int flush_trash_fifo(struct most_c_obj *c) | |
230 | { | |
231 | struct mbo *mbo, *tmp; | |
232 | unsigned long flags; | |
233 | ||
234 | spin_lock_irqsave(&c->fifo_lock, flags); | |
235 | list_for_each_entry_safe(mbo, tmp, &c->trash_fifo, list) { | |
236 | list_del(&mbo->list); | |
237 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
238 | most_free_mbo_coherent(mbo); | |
239 | spin_lock_irqsave(&c->fifo_lock, flags); | |
240 | } | |
241 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /** | |
246 | * most_channel_release - release function of channel object | |
247 | * @kobj: pointer to channel's kobject | |
248 | */ | |
249 | static void most_channel_release(struct kobject *kobj) | |
250 | { | |
251 | struct most_c_obj *c = to_c_obj(kobj); | |
252 | ||
253 | kfree(c); | |
254 | } | |
255 | ||
256 | static ssize_t show_available_directions(struct most_c_obj *c, | |
edaa1e33 CG |
257 | struct most_c_attr *attr, |
258 | char *buf) | |
57562a72 CG |
259 | { |
260 | unsigned int i = c->channel_id; | |
261 | ||
262 | strcpy(buf, ""); | |
263 | if (c->iface->channel_vector[i].direction & MOST_CH_RX) | |
264 | strcat(buf, "dir_rx "); | |
265 | if (c->iface->channel_vector[i].direction & MOST_CH_TX) | |
266 | strcat(buf, "dir_tx "); | |
267 | strcat(buf, "\n"); | |
268 | return strlen(buf) + 1; | |
269 | } | |
270 | ||
271 | static ssize_t show_available_datatypes(struct most_c_obj *c, | |
272 | struct most_c_attr *attr, | |
273 | char *buf) | |
274 | { | |
275 | unsigned int i = c->channel_id; | |
276 | ||
277 | strcpy(buf, ""); | |
278 | if (c->iface->channel_vector[i].data_type & MOST_CH_CONTROL) | |
279 | strcat(buf, "control "); | |
280 | if (c->iface->channel_vector[i].data_type & MOST_CH_ASYNC) | |
281 | strcat(buf, "async "); | |
282 | if (c->iface->channel_vector[i].data_type & MOST_CH_SYNC) | |
283 | strcat(buf, "sync "); | |
284 | if (c->iface->channel_vector[i].data_type & MOST_CH_ISOC_AVP) | |
285 | strcat(buf, "isoc_avp "); | |
286 | strcat(buf, "\n"); | |
287 | return strlen(buf) + 1; | |
288 | } | |
289 | ||
290 | static | |
291 | ssize_t show_number_of_packet_buffers(struct most_c_obj *c, | |
292 | struct most_c_attr *attr, | |
293 | char *buf) | |
294 | { | |
295 | unsigned int i = c->channel_id; | |
296 | ||
297 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
298 | c->iface->channel_vector[i].num_buffers_packet); | |
299 | } | |
300 | ||
301 | static | |
302 | ssize_t show_number_of_stream_buffers(struct most_c_obj *c, | |
303 | struct most_c_attr *attr, | |
304 | char *buf) | |
305 | { | |
306 | unsigned int i = c->channel_id; | |
307 | ||
308 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
309 | c->iface->channel_vector[i].num_buffers_streaming); | |
310 | } | |
311 | ||
312 | static | |
313 | ssize_t show_size_of_packet_buffer(struct most_c_obj *c, | |
314 | struct most_c_attr *attr, | |
315 | char *buf) | |
316 | { | |
317 | unsigned int i = c->channel_id; | |
318 | ||
319 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
320 | c->iface->channel_vector[i].buffer_size_packet); | |
321 | } | |
322 | ||
323 | static | |
324 | ssize_t show_size_of_stream_buffer(struct most_c_obj *c, | |
325 | struct most_c_attr *attr, | |
326 | char *buf) | |
327 | { | |
328 | unsigned int i = c->channel_id; | |
329 | ||
330 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
331 | c->iface->channel_vector[i].buffer_size_streaming); | |
332 | } | |
333 | ||
334 | static ssize_t show_channel_starving(struct most_c_obj *c, | |
335 | struct most_c_attr *attr, | |
336 | char *buf) | |
337 | { | |
338 | return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving); | |
339 | } | |
340 | ||
57562a72 | 341 | #define create_show_channel_attribute(val) \ |
add04a98 | 342 | static MOST_CHNL_ATTR(val, S_IRUGO, show_##val, NULL) |
57562a72 CG |
343 | |
344 | create_show_channel_attribute(available_directions); | |
345 | create_show_channel_attribute(available_datatypes); | |
346 | create_show_channel_attribute(number_of_packet_buffers); | |
347 | create_show_channel_attribute(number_of_stream_buffers); | |
348 | create_show_channel_attribute(size_of_stream_buffer); | |
349 | create_show_channel_attribute(size_of_packet_buffer); | |
350 | create_show_channel_attribute(channel_starving); | |
351 | ||
352 | static ssize_t show_set_number_of_buffers(struct most_c_obj *c, | |
353 | struct most_c_attr *attr, | |
354 | char *buf) | |
355 | { | |
356 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers); | |
357 | } | |
358 | ||
359 | static ssize_t store_set_number_of_buffers(struct most_c_obj *c, | |
360 | struct most_c_attr *attr, | |
361 | const char *buf, | |
362 | size_t count) | |
363 | { | |
364 | int ret = kstrtou16(buf, 0, &c->cfg.num_buffers); | |
365 | ||
366 | if (ret) | |
367 | return ret; | |
368 | return count; | |
369 | } | |
370 | ||
371 | static ssize_t show_set_buffer_size(struct most_c_obj *c, | |
372 | struct most_c_attr *attr, | |
373 | char *buf) | |
374 | { | |
375 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size); | |
376 | } | |
377 | ||
378 | static ssize_t store_set_buffer_size(struct most_c_obj *c, | |
379 | struct most_c_attr *attr, | |
380 | const char *buf, | |
381 | size_t count) | |
382 | { | |
383 | int ret = kstrtou16(buf, 0, &c->cfg.buffer_size); | |
384 | ||
385 | if (ret) | |
386 | return ret; | |
387 | return count; | |
388 | } | |
389 | ||
390 | static ssize_t show_set_direction(struct most_c_obj *c, | |
391 | struct most_c_attr *attr, | |
392 | char *buf) | |
393 | { | |
394 | if (c->cfg.direction & MOST_CH_TX) | |
395 | return snprintf(buf, PAGE_SIZE, "dir_tx\n"); | |
396 | else if (c->cfg.direction & MOST_CH_RX) | |
397 | return snprintf(buf, PAGE_SIZE, "dir_rx\n"); | |
398 | return snprintf(buf, PAGE_SIZE, "unconfigured\n"); | |
399 | } | |
400 | ||
401 | static ssize_t store_set_direction(struct most_c_obj *c, | |
402 | struct most_c_attr *attr, | |
403 | const char *buf, | |
404 | size_t count) | |
405 | { | |
9deba73d | 406 | if (!strcmp(buf, "dir_rx\n")) { |
57562a72 | 407 | c->cfg.direction = MOST_CH_RX; |
9deba73d | 408 | } else if (!strcmp(buf, "dir_tx\n")) { |
57562a72 | 409 | c->cfg.direction = MOST_CH_TX; |
9deba73d | 410 | } else { |
57562a72 CG |
411 | pr_info("WARN: invalid attribute settings\n"); |
412 | return -EINVAL; | |
413 | } | |
414 | return count; | |
415 | } | |
416 | ||
417 | static ssize_t show_set_datatype(struct most_c_obj *c, | |
418 | struct most_c_attr *attr, | |
419 | char *buf) | |
420 | { | |
e7f2b70f HPGE |
421 | int i; |
422 | ||
423 | for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) { | |
424 | if (c->cfg.data_type & ch_data_type[i].most_ch_data_type) | |
425 | return snprintf(buf, PAGE_SIZE, ch_data_type[i].name); | |
426 | } | |
57562a72 CG |
427 | return snprintf(buf, PAGE_SIZE, "unconfigured\n"); |
428 | } | |
429 | ||
430 | static ssize_t store_set_datatype(struct most_c_obj *c, | |
431 | struct most_c_attr *attr, | |
432 | const char *buf, | |
433 | size_t count) | |
434 | { | |
e7f2b70f HPGE |
435 | int i; |
436 | ||
437 | for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) { | |
438 | if (!strcmp(buf, ch_data_type[i].name)) { | |
439 | c->cfg.data_type = ch_data_type[i].most_ch_data_type; | |
440 | break; | |
441 | } | |
442 | } | |
443 | ||
444 | if (i == ARRAY_SIZE(ch_data_type)) { | |
57562a72 CG |
445 | pr_info("WARN: invalid attribute settings\n"); |
446 | return -EINVAL; | |
447 | } | |
448 | return count; | |
449 | } | |
450 | ||
451 | static ssize_t show_set_subbuffer_size(struct most_c_obj *c, | |
452 | struct most_c_attr *attr, | |
453 | char *buf) | |
454 | { | |
455 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size); | |
456 | } | |
457 | ||
458 | static ssize_t store_set_subbuffer_size(struct most_c_obj *c, | |
459 | struct most_c_attr *attr, | |
460 | const char *buf, | |
461 | size_t count) | |
462 | { | |
463 | int ret = kstrtou16(buf, 0, &c->cfg.subbuffer_size); | |
464 | ||
465 | if (ret) | |
466 | return ret; | |
467 | return count; | |
468 | } | |
469 | ||
470 | static ssize_t show_set_packets_per_xact(struct most_c_obj *c, | |
471 | struct most_c_attr *attr, | |
472 | char *buf) | |
473 | { | |
474 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact); | |
475 | } | |
476 | ||
477 | static ssize_t store_set_packets_per_xact(struct most_c_obj *c, | |
478 | struct most_c_attr *attr, | |
479 | const char *buf, | |
480 | size_t count) | |
481 | { | |
482 | int ret = kstrtou16(buf, 0, &c->cfg.packets_per_xact); | |
483 | ||
484 | if (ret) | |
485 | return ret; | |
486 | return count; | |
487 | } | |
488 | ||
489 | #define create_channel_attribute(value) \ | |
490 | static MOST_CHNL_ATTR(value, S_IRUGO | S_IWUSR, \ | |
491 | show_##value, \ | |
492 | store_##value) | |
493 | ||
494 | create_channel_attribute(set_buffer_size); | |
495 | create_channel_attribute(set_number_of_buffers); | |
496 | create_channel_attribute(set_direction); | |
497 | create_channel_attribute(set_datatype); | |
498 | create_channel_attribute(set_subbuffer_size); | |
499 | create_channel_attribute(set_packets_per_xact); | |
500 | ||
57562a72 CG |
501 | /** |
502 | * most_channel_def_attrs - array of default attributes of channel object | |
503 | */ | |
504 | static struct attribute *most_channel_def_attrs[] = { | |
505 | &most_chnl_attr_available_directions.attr, | |
506 | &most_chnl_attr_available_datatypes.attr, | |
507 | &most_chnl_attr_number_of_packet_buffers.attr, | |
508 | &most_chnl_attr_number_of_stream_buffers.attr, | |
509 | &most_chnl_attr_size_of_packet_buffer.attr, | |
510 | &most_chnl_attr_size_of_stream_buffer.attr, | |
511 | &most_chnl_attr_set_number_of_buffers.attr, | |
512 | &most_chnl_attr_set_buffer_size.attr, | |
513 | &most_chnl_attr_set_direction.attr, | |
514 | &most_chnl_attr_set_datatype.attr, | |
515 | &most_chnl_attr_set_subbuffer_size.attr, | |
516 | &most_chnl_attr_set_packets_per_xact.attr, | |
517 | &most_chnl_attr_channel_starving.attr, | |
518 | NULL, | |
519 | }; | |
520 | ||
521 | static struct kobj_type most_channel_ktype = { | |
522 | .sysfs_ops = &most_channel_sysfs_ops, | |
523 | .release = most_channel_release, | |
524 | .default_attrs = most_channel_def_attrs, | |
525 | }; | |
526 | ||
527 | static struct kset *most_channel_kset; | |
528 | ||
529 | /** | |
530 | * create_most_c_obj - allocates a channel object | |
531 | * @name: name of the channel object | |
532 | * @parent: parent kobject | |
533 | * | |
534 | * This create a channel object and registers it with sysfs. | |
535 | * Returns a pointer to the object or NULL when something went wrong. | |
536 | */ | |
537 | static struct most_c_obj * | |
538 | create_most_c_obj(const char *name, struct kobject *parent) | |
539 | { | |
540 | struct most_c_obj *c; | |
541 | int retval; | |
542 | ||
543 | c = kzalloc(sizeof(*c), GFP_KERNEL); | |
544 | if (!c) | |
545 | return NULL; | |
546 | c->kobj.kset = most_channel_kset; | |
547 | retval = kobject_init_and_add(&c->kobj, &most_channel_ktype, parent, | |
548 | "%s", name); | |
549 | if (retval) { | |
550 | kobject_put(&c->kobj); | |
551 | return NULL; | |
552 | } | |
553 | kobject_uevent(&c->kobj, KOBJ_ADD); | |
554 | return c; | |
555 | } | |
556 | ||
57562a72 CG |
557 | /* ___ ___ |
558 | * ___I N S T A N C E___ | |
559 | */ | |
560 | #define MOST_INST_ATTR(_name, _mode, _show, _store) \ | |
561 | struct most_inst_attribute most_inst_attr_##_name = \ | |
562 | __ATTR(_name, _mode, _show, _store) | |
563 | ||
564 | static struct list_head instance_list; | |
565 | ||
566 | /** | |
567 | * struct most_inst_attribute - to access the attributes of instance object | |
568 | * @attr: attributes of an instance | |
569 | * @show: pointer to the show function | |
570 | * @store: pointer to the store function | |
571 | */ | |
572 | struct most_inst_attribute { | |
573 | struct attribute attr; | |
574 | ssize_t (*show)(struct most_inst_obj *d, | |
575 | struct most_inst_attribute *attr, | |
576 | char *buf); | |
577 | ssize_t (*store)(struct most_inst_obj *d, | |
578 | struct most_inst_attribute *attr, | |
579 | const char *buf, | |
580 | size_t count); | |
581 | }; | |
9cbe5aa6 | 582 | |
57562a72 CG |
583 | #define to_instance_attr(a) \ |
584 | container_of(a, struct most_inst_attribute, attr) | |
585 | ||
586 | /** | |
587 | * instance_attr_show - show function for an instance object | |
588 | * @kobj: pointer to kobject | |
589 | * @attr: pointer to attribute struct | |
590 | * @buf: buffer | |
591 | */ | |
592 | static ssize_t instance_attr_show(struct kobject *kobj, | |
593 | struct attribute *attr, | |
594 | char *buf) | |
595 | { | |
596 | struct most_inst_attribute *instance_attr; | |
597 | struct most_inst_obj *instance_obj; | |
598 | ||
599 | instance_attr = to_instance_attr(attr); | |
600 | instance_obj = to_inst_obj(kobj); | |
601 | ||
602 | if (!instance_attr->show) | |
603 | return -EIO; | |
604 | ||
605 | return instance_attr->show(instance_obj, instance_attr, buf); | |
606 | } | |
607 | ||
608 | /** | |
609 | * instance_attr_store - store function for an instance object | |
610 | * @kobj: pointer to kobject | |
611 | * @attr: pointer to attribute struct | |
612 | * @buf: buffer | |
613 | * @len: length of buffer | |
614 | */ | |
615 | static ssize_t instance_attr_store(struct kobject *kobj, | |
616 | struct attribute *attr, | |
617 | const char *buf, | |
618 | size_t len) | |
619 | { | |
620 | struct most_inst_attribute *instance_attr; | |
621 | struct most_inst_obj *instance_obj; | |
622 | ||
623 | instance_attr = to_instance_attr(attr); | |
624 | instance_obj = to_inst_obj(kobj); | |
625 | ||
626 | if (!instance_attr->store) | |
627 | return -EIO; | |
628 | ||
629 | return instance_attr->store(instance_obj, instance_attr, buf, len); | |
630 | } | |
631 | ||
632 | static const struct sysfs_ops most_inst_sysfs_ops = { | |
633 | .show = instance_attr_show, | |
634 | .store = instance_attr_store, | |
635 | }; | |
636 | ||
637 | /** | |
638 | * most_inst_release - release function for instance object | |
639 | * @kobj: pointer to instance's kobject | |
640 | * | |
641 | * This frees the allocated memory for the instance object | |
642 | */ | |
643 | static void most_inst_release(struct kobject *kobj) | |
644 | { | |
645 | struct most_inst_obj *inst = to_inst_obj(kobj); | |
646 | ||
647 | kfree(inst); | |
648 | } | |
649 | ||
650 | static ssize_t show_description(struct most_inst_obj *instance_obj, | |
651 | struct most_inst_attribute *attr, | |
652 | char *buf) | |
653 | { | |
654 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
655 | instance_obj->iface->description); | |
656 | } | |
657 | ||
658 | static ssize_t show_interface(struct most_inst_obj *instance_obj, | |
659 | struct most_inst_attribute *attr, | |
660 | char *buf) | |
661 | { | |
662 | switch (instance_obj->iface->interface) { | |
663 | case ITYPE_LOOPBACK: | |
664 | return snprintf(buf, PAGE_SIZE, "loopback\n"); | |
665 | case ITYPE_I2C: | |
666 | return snprintf(buf, PAGE_SIZE, "i2c\n"); | |
667 | case ITYPE_I2S: | |
668 | return snprintf(buf, PAGE_SIZE, "i2s\n"); | |
669 | case ITYPE_TSI: | |
670 | return snprintf(buf, PAGE_SIZE, "tsi\n"); | |
671 | case ITYPE_HBI: | |
672 | return snprintf(buf, PAGE_SIZE, "hbi\n"); | |
673 | case ITYPE_MEDIALB_DIM: | |
674 | return snprintf(buf, PAGE_SIZE, "mlb_dim\n"); | |
675 | case ITYPE_MEDIALB_DIM2: | |
676 | return snprintf(buf, PAGE_SIZE, "mlb_dim2\n"); | |
677 | case ITYPE_USB: | |
678 | return snprintf(buf, PAGE_SIZE, "usb\n"); | |
679 | case ITYPE_PCIE: | |
680 | return snprintf(buf, PAGE_SIZE, "pcie\n"); | |
681 | } | |
682 | return snprintf(buf, PAGE_SIZE, "unknown\n"); | |
683 | } | |
684 | ||
685 | #define create_inst_attribute(value) \ | |
686 | static MOST_INST_ATTR(value, S_IRUGO, show_##value, NULL) | |
687 | ||
688 | create_inst_attribute(description); | |
689 | create_inst_attribute(interface); | |
690 | ||
691 | static struct attribute *most_inst_def_attrs[] = { | |
692 | &most_inst_attr_description.attr, | |
693 | &most_inst_attr_interface.attr, | |
694 | NULL, | |
695 | }; | |
696 | ||
697 | static struct kobj_type most_inst_ktype = { | |
698 | .sysfs_ops = &most_inst_sysfs_ops, | |
699 | .release = most_inst_release, | |
700 | .default_attrs = most_inst_def_attrs, | |
701 | }; | |
702 | ||
703 | static struct kset *most_inst_kset; | |
704 | ||
57562a72 CG |
705 | /** |
706 | * create_most_inst_obj - creates an instance object | |
707 | * @name: name of the object to be created | |
708 | * | |
709 | * This allocates memory for an instance structure, assigns the proper kset | |
710 | * and registers it with sysfs. | |
711 | * | |
712 | * Returns a pointer to the instance object or NULL when something went wrong. | |
713 | */ | |
714 | static struct most_inst_obj *create_most_inst_obj(const char *name) | |
715 | { | |
716 | struct most_inst_obj *inst; | |
717 | int retval; | |
718 | ||
719 | inst = kzalloc(sizeof(*inst), GFP_KERNEL); | |
720 | if (!inst) | |
721 | return NULL; | |
722 | inst->kobj.kset = most_inst_kset; | |
723 | retval = kobject_init_and_add(&inst->kobj, &most_inst_ktype, NULL, | |
724 | "%s", name); | |
725 | if (retval) { | |
726 | kobject_put(&inst->kobj); | |
727 | return NULL; | |
728 | } | |
729 | kobject_uevent(&inst->kobj, KOBJ_ADD); | |
730 | return inst; | |
731 | } | |
732 | ||
733 | /** | |
734 | * destroy_most_inst_obj - MOST instance release function | |
735 | * @inst: pointer to the instance object | |
736 | * | |
737 | * This decrements the reference counter of the instance object. | |
738 | * If the reference count turns zero, its release function is called | |
739 | */ | |
740 | static void destroy_most_inst_obj(struct most_inst_obj *inst) | |
741 | { | |
742 | struct most_c_obj *c, *tmp; | |
743 | ||
57562a72 | 744 | list_for_each_entry_safe(c, tmp, &inst->channel_list, list) { |
9ce039a0 CG |
745 | flush_trash_fifo(c); |
746 | flush_channel_fifos(c); | |
9ce039a0 | 747 | kobject_put(&c->kobj); |
57562a72 CG |
748 | } |
749 | kobject_put(&inst->kobj); | |
750 | } | |
751 | ||
752 | /* ___ ___ | |
753 | * ___A I M___ | |
754 | */ | |
755 | struct most_aim_obj { | |
756 | struct kobject kobj; | |
757 | struct list_head list; | |
758 | struct most_aim *driver; | |
759 | char add_link[STRING_SIZE]; | |
760 | char remove_link[STRING_SIZE]; | |
761 | }; | |
9cbe5aa6 | 762 | |
57562a72 CG |
763 | #define to_aim_obj(d) container_of(d, struct most_aim_obj, kobj) |
764 | ||
765 | static struct list_head aim_list; | |
766 | ||
57562a72 CG |
767 | /** |
768 | * struct most_aim_attribute - to access the attributes of AIM object | |
769 | * @attr: attributes of an AIM | |
770 | * @show: pointer to the show function | |
771 | * @store: pointer to the store function | |
772 | */ | |
773 | struct most_aim_attribute { | |
774 | struct attribute attr; | |
775 | ssize_t (*show)(struct most_aim_obj *d, | |
776 | struct most_aim_attribute *attr, | |
777 | char *buf); | |
778 | ssize_t (*store)(struct most_aim_obj *d, | |
779 | struct most_aim_attribute *attr, | |
780 | const char *buf, | |
781 | size_t count); | |
782 | }; | |
9cbe5aa6 | 783 | |
57562a72 CG |
784 | #define to_aim_attr(a) container_of(a, struct most_aim_attribute, attr) |
785 | ||
786 | /** | |
787 | * aim_attr_show - show function of an AIM object | |
788 | * @kobj: pointer to kobject | |
789 | * @attr: pointer to attribute struct | |
790 | * @buf: buffer | |
791 | */ | |
792 | static ssize_t aim_attr_show(struct kobject *kobj, | |
793 | struct attribute *attr, | |
794 | char *buf) | |
795 | { | |
796 | struct most_aim_attribute *aim_attr; | |
797 | struct most_aim_obj *aim_obj; | |
798 | ||
799 | aim_attr = to_aim_attr(attr); | |
800 | aim_obj = to_aim_obj(kobj); | |
801 | ||
802 | if (!aim_attr->show) | |
803 | return -EIO; | |
804 | ||
805 | return aim_attr->show(aim_obj, aim_attr, buf); | |
806 | } | |
807 | ||
808 | /** | |
809 | * aim_attr_store - store function of an AIM object | |
810 | * @kobj: pointer to kobject | |
811 | * @attr: pointer to attribute struct | |
812 | * @buf: buffer | |
813 | * @len: length of buffer | |
814 | */ | |
815 | static ssize_t aim_attr_store(struct kobject *kobj, | |
816 | struct attribute *attr, | |
817 | const char *buf, | |
818 | size_t len) | |
819 | { | |
820 | struct most_aim_attribute *aim_attr; | |
821 | struct most_aim_obj *aim_obj; | |
822 | ||
823 | aim_attr = to_aim_attr(attr); | |
824 | aim_obj = to_aim_obj(kobj); | |
825 | ||
826 | if (!aim_attr->store) | |
827 | return -EIO; | |
828 | return aim_attr->store(aim_obj, aim_attr, buf, len); | |
829 | } | |
830 | ||
831 | static const struct sysfs_ops most_aim_sysfs_ops = { | |
832 | .show = aim_attr_show, | |
833 | .store = aim_attr_store, | |
834 | }; | |
835 | ||
836 | /** | |
837 | * most_aim_release - AIM release function | |
838 | * @kobj: pointer to AIM's kobject | |
839 | */ | |
840 | static void most_aim_release(struct kobject *kobj) | |
841 | { | |
842 | struct most_aim_obj *aim_obj = to_aim_obj(kobj); | |
843 | ||
844 | kfree(aim_obj); | |
845 | } | |
846 | ||
847 | static ssize_t show_add_link(struct most_aim_obj *aim_obj, | |
848 | struct most_aim_attribute *attr, | |
849 | char *buf) | |
850 | { | |
851 | return snprintf(buf, PAGE_SIZE, "%s\n", aim_obj->add_link); | |
852 | } | |
853 | ||
854 | /** | |
855 | * split_string - parses and changes string in the buffer buf and | |
856 | * splits it into two mandatory and one optional substrings. | |
857 | * | |
858 | * @buf: complete string from attribute 'add_channel' | |
859 | * @a: address of pointer to 1st substring (=instance name) | |
860 | * @b: address of pointer to 2nd substring (=channel name) | |
861 | * @c: optional address of pointer to 3rd substring (=user defined name) | |
862 | * | |
863 | * Examples: | |
864 | * | |
865 | * Input: "mdev0:ch0@ep_81:my_channel\n" or | |
866 | * "mdev0:ch0@ep_81:my_channel" | |
867 | * | |
868 | * Output: *a -> "mdev0", *b -> "ch0@ep_81", *c -> "my_channel" | |
869 | * | |
870 | * Input: "mdev0:ch0@ep_81\n" | |
871 | * Output: *a -> "mdev0", *b -> "ch0@ep_81", *c -> "" | |
872 | * | |
873 | * Input: "mdev0:ch0@ep_81" | |
874 | * Output: *a -> "mdev0", *b -> "ch0@ep_81", *c == NULL | |
875 | */ | |
c942ea7a | 876 | static int split_string(char *buf, char **a, char **b, char **c) |
57562a72 CG |
877 | { |
878 | *a = strsep(&buf, ":"); | |
879 | if (!*a) | |
880 | return -EIO; | |
881 | ||
882 | *b = strsep(&buf, ":\n"); | |
883 | if (!*b) | |
884 | return -EIO; | |
885 | ||
886 | if (c) | |
887 | *c = strsep(&buf, ":\n"); | |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
892 | /** | |
893 | * get_channel_by_name - get pointer to channel object | |
894 | * @mdev: name of the device instance | |
895 | * @mdev_ch: name of the respective channel | |
896 | * | |
897 | * This retrieves the pointer to a channel object. | |
898 | */ | |
899 | static struct | |
900 | most_c_obj *get_channel_by_name(char *mdev, char *mdev_ch) | |
901 | { | |
902 | struct most_c_obj *c, *tmp; | |
903 | struct most_inst_obj *i, *i_tmp; | |
904 | int found = 0; | |
905 | ||
906 | list_for_each_entry_safe(i, i_tmp, &instance_list, list) { | |
907 | if (!strcmp(kobject_name(&i->kobj), mdev)) { | |
908 | found++; | |
909 | break; | |
910 | } | |
911 | } | |
912 | if (unlikely(!found)) | |
913 | return ERR_PTR(-EIO); | |
914 | ||
915 | list_for_each_entry_safe(c, tmp, &i->channel_list, list) { | |
916 | if (!strcmp(kobject_name(&c->kobj), mdev_ch)) { | |
917 | found++; | |
918 | break; | |
919 | } | |
920 | } | |
47af41b0 | 921 | if (unlikely(found < 2)) |
57562a72 CG |
922 | return ERR_PTR(-EIO); |
923 | return c; | |
924 | } | |
925 | ||
926 | /** | |
927 | * store_add_link - store() function for add_link attribute | |
928 | * @aim_obj: pointer to AIM object | |
929 | * @attr: its attributes | |
930 | * @buf: buffer | |
931 | * @len: buffer length | |
932 | * | |
933 | * This parses the string given by buf and splits it into | |
934 | * three substrings. Note: third substring is optional. In case a cdev | |
935 | * AIM is loaded the optional 3rd substring will make up the name of | |
936 | * device node in the /dev directory. If omitted, the device node will | |
937 | * inherit the channel's name within sysfs. | |
938 | * | |
939 | * Searches for a pair of device and channel and probes the AIM | |
940 | * | |
941 | * Example: | |
942 | * (1) echo -n -e "mdev0:ch0@ep_81:my_rxchannel\n" >add_link | |
943 | * (2) echo -n -e "mdev0:ch0@ep_81\n" >add_link | |
944 | * | |
945 | * (1) would create the device node /dev/my_rxchannel | |
946 | * (2) would create the device node /dev/mdev0-ch0@ep_81 | |
947 | */ | |
948 | static ssize_t store_add_link(struct most_aim_obj *aim_obj, | |
949 | struct most_aim_attribute *attr, | |
950 | const char *buf, | |
951 | size_t len) | |
952 | { | |
953 | struct most_c_obj *c; | |
954 | struct most_aim **aim_ptr; | |
955 | char buffer[STRING_SIZE]; | |
956 | char *mdev; | |
957 | char *mdev_ch; | |
958 | char *mdev_devnod; | |
959 | char devnod_buf[STRING_SIZE]; | |
960 | int ret; | |
3f78f611 | 961 | size_t max_len = min_t(size_t, len + 1, STRING_SIZE); |
57562a72 CG |
962 | |
963 | strlcpy(buffer, buf, max_len); | |
964 | strlcpy(aim_obj->add_link, buf, max_len); | |
965 | ||
966 | ret = split_string(buffer, &mdev, &mdev_ch, &mdev_devnod); | |
967 | if (ret) | |
968 | return ret; | |
969 | ||
04ca5837 | 970 | if (!mdev_devnod || *mdev_devnod == 0) { |
1446ff09 CG |
971 | snprintf(devnod_buf, sizeof(devnod_buf), "%s-%s", mdev, |
972 | mdev_ch); | |
57562a72 CG |
973 | mdev_devnod = devnod_buf; |
974 | } | |
975 | ||
976 | c = get_channel_by_name(mdev, mdev_ch); | |
977 | if (IS_ERR(c)) | |
978 | return -ENODEV; | |
979 | ||
ccfbaee0 CG |
980 | if (!c->aim0.ptr) |
981 | aim_ptr = &c->aim0.ptr; | |
982 | else if (!c->aim1.ptr) | |
983 | aim_ptr = &c->aim1.ptr; | |
57562a72 CG |
984 | else |
985 | return -ENOSPC; | |
986 | ||
42e252a6 | 987 | *aim_ptr = aim_obj->driver; |
57562a72 CG |
988 | ret = aim_obj->driver->probe_channel(c->iface, c->channel_id, |
989 | &c->cfg, &c->kobj, mdev_devnod); | |
42e252a6 CG |
990 | if (ret) { |
991 | *aim_ptr = NULL; | |
57562a72 | 992 | return ret; |
42e252a6 CG |
993 | } |
994 | ||
57562a72 CG |
995 | return len; |
996 | } | |
997 | ||
c942ea7a | 998 | static struct most_aim_attribute most_aim_attr_add_link = |
57562a72 CG |
999 | __ATTR(add_link, S_IRUGO | S_IWUSR, show_add_link, store_add_link); |
1000 | ||
1001 | static ssize_t show_remove_link(struct most_aim_obj *aim_obj, | |
1002 | struct most_aim_attribute *attr, | |
1003 | char *buf) | |
1004 | { | |
1005 | return snprintf(buf, PAGE_SIZE, "%s\n", aim_obj->remove_link); | |
1006 | } | |
1007 | ||
1008 | /** | |
1009 | * store_remove_link - store function for remove_link attribute | |
1010 | * @aim_obj: pointer to AIM object | |
1011 | * @attr: its attributes | |
1012 | * @buf: buffer | |
1013 | * @len: buffer length | |
1014 | * | |
1015 | * Example: | |
1016 | * echo -n -e "mdev0:ch0@ep_81\n" >remove_link | |
1017 | */ | |
1018 | static ssize_t store_remove_link(struct most_aim_obj *aim_obj, | |
1019 | struct most_aim_attribute *attr, | |
1020 | const char *buf, | |
1021 | size_t len) | |
1022 | { | |
1023 | struct most_c_obj *c; | |
1024 | char buffer[STRING_SIZE]; | |
1025 | char *mdev; | |
1026 | char *mdev_ch; | |
1027 | int ret; | |
3f78f611 | 1028 | size_t max_len = min_t(size_t, len + 1, STRING_SIZE); |
57562a72 CG |
1029 | |
1030 | strlcpy(buffer, buf, max_len); | |
1031 | strlcpy(aim_obj->remove_link, buf, max_len); | |
1032 | ret = split_string(buffer, &mdev, &mdev_ch, NULL); | |
1033 | if (ret) | |
1034 | return ret; | |
1035 | ||
1036 | c = get_channel_by_name(mdev, mdev_ch); | |
1037 | if (IS_ERR(c)) | |
1038 | return -ENODEV; | |
1039 | ||
44fe5781 CG |
1040 | if (aim_obj->driver->disconnect_channel(c->iface, c->channel_id)) |
1041 | return -EIO; | |
ccfbaee0 CG |
1042 | if (c->aim0.ptr == aim_obj->driver) |
1043 | c->aim0.ptr = NULL; | |
1044 | if (c->aim1.ptr == aim_obj->driver) | |
1045 | c->aim1.ptr = NULL; | |
57562a72 CG |
1046 | return len; |
1047 | } | |
1048 | ||
c942ea7a | 1049 | static struct most_aim_attribute most_aim_attr_remove_link = |
1446ff09 CG |
1050 | __ATTR(remove_link, S_IRUGO | S_IWUSR, show_remove_link, |
1051 | store_remove_link); | |
57562a72 CG |
1052 | |
1053 | static struct attribute *most_aim_def_attrs[] = { | |
1054 | &most_aim_attr_add_link.attr, | |
1055 | &most_aim_attr_remove_link.attr, | |
1056 | NULL, | |
1057 | }; | |
1058 | ||
1059 | static struct kobj_type most_aim_ktype = { | |
1060 | .sysfs_ops = &most_aim_sysfs_ops, | |
1061 | .release = most_aim_release, | |
1062 | .default_attrs = most_aim_def_attrs, | |
1063 | }; | |
1064 | ||
1065 | static struct kset *most_aim_kset; | |
1066 | ||
1067 | /** | |
1068 | * create_most_aim_obj - creates an AIM object | |
1069 | * @name: name of the AIM | |
1070 | * | |
1071 | * This creates an AIM object assigns the proper kset and registers | |
1072 | * it with sysfs. | |
1073 | * Returns a pointer to the object or NULL if something went wrong. | |
1074 | */ | |
1075 | static struct most_aim_obj *create_most_aim_obj(const char *name) | |
1076 | { | |
1077 | struct most_aim_obj *most_aim; | |
1078 | int retval; | |
1079 | ||
1080 | most_aim = kzalloc(sizeof(*most_aim), GFP_KERNEL); | |
1081 | if (!most_aim) | |
1082 | return NULL; | |
1083 | most_aim->kobj.kset = most_aim_kset; | |
1084 | retval = kobject_init_and_add(&most_aim->kobj, &most_aim_ktype, | |
1085 | NULL, "%s", name); | |
1086 | if (retval) { | |
1087 | kobject_put(&most_aim->kobj); | |
1088 | return NULL; | |
1089 | } | |
1090 | kobject_uevent(&most_aim->kobj, KOBJ_ADD); | |
1091 | return most_aim; | |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * destroy_most_aim_obj - AIM release function | |
1096 | * @p: pointer to AIM object | |
1097 | * | |
1098 | * This decrements the reference counter of the AIM object. If the | |
1099 | * reference count turns zero, its release function will be called. | |
1100 | */ | |
1101 | static void destroy_most_aim_obj(struct most_aim_obj *p) | |
1102 | { | |
1103 | kobject_put(&p->kobj); | |
1104 | } | |
1105 | ||
57562a72 CG |
1106 | /* ___ ___ |
1107 | * ___C O R E___ | |
1108 | */ | |
1109 | ||
1110 | /** | |
1111 | * Instantiation of the MOST bus | |
1112 | */ | |
c942ea7a | 1113 | static struct bus_type most_bus = { |
57562a72 CG |
1114 | .name = "most", |
1115 | }; | |
1116 | ||
1117 | /** | |
1118 | * Instantiation of the core driver | |
1119 | */ | |
c942ea7a | 1120 | static struct device_driver mostcore = { |
57562a72 CG |
1121 | .name = "mostcore", |
1122 | .bus = &most_bus, | |
1123 | }; | |
1124 | ||
1125 | static inline void trash_mbo(struct mbo *mbo) | |
1126 | { | |
1127 | unsigned long flags; | |
1128 | struct most_c_obj *c = mbo->context; | |
1129 | ||
1130 | spin_lock_irqsave(&c->fifo_lock, flags); | |
1131 | list_add(&mbo->list, &c->trash_fifo); | |
1132 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1133 | } | |
1134 | ||
bf9503f1 | 1135 | static bool hdm_mbo_ready(struct most_c_obj *c) |
57562a72 | 1136 | { |
bf9503f1 | 1137 | bool empty; |
57562a72 | 1138 | |
bf9503f1 CG |
1139 | if (c->enqueue_halt) |
1140 | return false; | |
1141 | ||
1142 | spin_lock_irq(&c->fifo_lock); | |
1143 | empty = list_empty(&c->halt_fifo); | |
1144 | spin_unlock_irq(&c->fifo_lock); | |
1145 | ||
1146 | return !empty; | |
57562a72 CG |
1147 | } |
1148 | ||
1149 | static void nq_hdm_mbo(struct mbo *mbo) | |
1150 | { | |
1151 | unsigned long flags; | |
1152 | struct most_c_obj *c = mbo->context; | |
1153 | ||
1154 | spin_lock_irqsave(&c->fifo_lock, flags); | |
1155 | list_add_tail(&mbo->list, &c->halt_fifo); | |
1156 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1157 | wake_up_interruptible(&c->hdm_fifo_wq); | |
1158 | } | |
1159 | ||
1160 | static int hdm_enqueue_thread(void *data) | |
1161 | { | |
1162 | struct most_c_obj *c = data; | |
1163 | struct mbo *mbo; | |
bf9503f1 | 1164 | int ret; |
57562a72 CG |
1165 | typeof(c->iface->enqueue) enqueue = c->iface->enqueue; |
1166 | ||
1167 | while (likely(!kthread_should_stop())) { | |
1168 | wait_event_interruptible(c->hdm_fifo_wq, | |
bf9503f1 | 1169 | hdm_mbo_ready(c) || |
623d8002 | 1170 | kthread_should_stop()); |
57562a72 | 1171 | |
bf9503f1 CG |
1172 | mutex_lock(&c->nq_mutex); |
1173 | spin_lock_irq(&c->fifo_lock); | |
1174 | if (unlikely(c->enqueue_halt || list_empty(&c->halt_fifo))) { | |
1175 | spin_unlock_irq(&c->fifo_lock); | |
1176 | mutex_unlock(&c->nq_mutex); | |
57562a72 | 1177 | continue; |
bf9503f1 CG |
1178 | } |
1179 | ||
1180 | mbo = list_pop_mbo(&c->halt_fifo); | |
1181 | spin_unlock_irq(&c->fifo_lock); | |
57562a72 CG |
1182 | |
1183 | if (c->cfg.direction == MOST_CH_RX) | |
1184 | mbo->buffer_length = c->cfg.buffer_size; | |
1185 | ||
bf9503f1 CG |
1186 | ret = enqueue(mbo->ifp, mbo->hdm_channel_id, mbo); |
1187 | mutex_unlock(&c->nq_mutex); | |
1188 | ||
1189 | if (unlikely(ret)) { | |
57562a72 CG |
1190 | pr_err("hdm enqueue failed\n"); |
1191 | nq_hdm_mbo(mbo); | |
1192 | c->hdm_enqueue_task = NULL; | |
1193 | return 0; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | static int run_enqueue_thread(struct most_c_obj *c, int channel_id) | |
1201 | { | |
1202 | struct task_struct *task = | |
246ed517 SB |
1203 | kthread_run(hdm_enqueue_thread, c, "hdm_fifo_%d", |
1204 | channel_id); | |
57562a72 CG |
1205 | |
1206 | if (IS_ERR(task)) | |
1207 | return PTR_ERR(task); | |
1208 | ||
1209 | c->hdm_enqueue_task = task; | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * arm_mbo - recycle MBO for further usage | |
1215 | * @mbo: buffer object | |
1216 | * | |
1217 | * This puts an MBO back to the list to have it ready for up coming | |
1218 | * tx transactions. | |
1219 | * | |
1220 | * In case the MBO belongs to a channel that recently has been | |
1221 | * poisoned, the MBO is scheduled to be trashed. | |
1222 | * Calls the completion handler of an attached AIM. | |
1223 | */ | |
1224 | static void arm_mbo(struct mbo *mbo) | |
1225 | { | |
1226 | unsigned long flags; | |
1227 | struct most_c_obj *c; | |
1228 | ||
1229 | BUG_ON((!mbo) || (!mbo->context)); | |
1230 | c = mbo->context; | |
1231 | ||
1232 | if (c->is_poisoned) { | |
1233 | trash_mbo(mbo); | |
1234 | return; | |
1235 | } | |
1236 | ||
1237 | spin_lock_irqsave(&c->fifo_lock, flags); | |
71457d48 | 1238 | ++*mbo->num_buffers_ptr; |
57562a72 CG |
1239 | list_add_tail(&mbo->list, &c->fifo); |
1240 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1241 | ||
ccfbaee0 CG |
1242 | if (c->aim0.refs && c->aim0.ptr->tx_completion) |
1243 | c->aim0.ptr->tx_completion(c->iface, c->channel_id); | |
f13f6981 | 1244 | |
ccfbaee0 CG |
1245 | if (c->aim1.refs && c->aim1.ptr->tx_completion) |
1246 | c->aim1.ptr->tx_completion(c->iface, c->channel_id); | |
57562a72 CG |
1247 | } |
1248 | ||
1249 | /** | |
1250 | * arm_mbo_chain - helper function that arms an MBO chain for the HDM | |
1251 | * @c: pointer to interface channel | |
1252 | * @dir: direction of the channel | |
1253 | * @compl: pointer to completion function | |
1254 | * | |
1255 | * This allocates buffer objects including the containing DMA coherent | |
1256 | * buffer and puts them in the fifo. | |
1257 | * Buffers of Rx channels are put in the kthread fifo, hence immediately | |
1258 | * submitted to the HDM. | |
1259 | * | |
1260 | * Returns the number of allocated and enqueued MBOs. | |
1261 | */ | |
c942ea7a AR |
1262 | static int arm_mbo_chain(struct most_c_obj *c, int dir, |
1263 | void (*compl)(struct mbo *)) | |
57562a72 CG |
1264 | { |
1265 | unsigned int i; | |
1266 | int retval; | |
1267 | struct mbo *mbo; | |
2ae07510 | 1268 | u32 coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len; |
57562a72 CG |
1269 | |
1270 | atomic_set(&c->mbo_nq_level, 0); | |
1271 | ||
1272 | for (i = 0; i < c->cfg.num_buffers; i++) { | |
1273 | mbo = kzalloc(sizeof(*mbo), GFP_KERNEL); | |
1274 | if (!mbo) { | |
57562a72 CG |
1275 | retval = i; |
1276 | goto _exit; | |
1277 | } | |
1278 | mbo->context = c; | |
1279 | mbo->ifp = c->iface; | |
1280 | mbo->hdm_channel_id = c->channel_id; | |
1281 | mbo->virt_address = dma_alloc_coherent(NULL, | |
1282 | coherent_buf_size, | |
1283 | &mbo->bus_address, | |
1284 | GFP_KERNEL); | |
1285 | if (!mbo->virt_address) { | |
1286 | pr_info("WARN: No DMA coherent buffer.\n"); | |
1287 | retval = i; | |
1288 | goto _error1; | |
1289 | } | |
1290 | mbo->complete = compl; | |
71457d48 | 1291 | mbo->num_buffers_ptr = &dummy_num_buffers; |
57562a72 CG |
1292 | if (dir == MOST_CH_RX) { |
1293 | nq_hdm_mbo(mbo); | |
1294 | atomic_inc(&c->mbo_nq_level); | |
1295 | } else { | |
1296 | arm_mbo(mbo); | |
1297 | } | |
1298 | } | |
1299 | return i; | |
1300 | ||
1301 | _error1: | |
1302 | kfree(mbo); | |
1303 | _exit: | |
1304 | return retval; | |
1305 | } | |
1306 | ||
1307 | /** | |
1308 | * most_submit_mbo - submits an MBO to fifo | |
1309 | * @mbo: pointer to the MBO | |
1310 | * | |
1311 | */ | |
1312 | int most_submit_mbo(struct mbo *mbo) | |
1313 | { | |
57562a72 CG |
1314 | if (unlikely((!mbo) || (!mbo->context))) { |
1315 | pr_err("Bad MBO or missing channel reference\n"); | |
1316 | return -EINVAL; | |
1317 | } | |
57562a72 CG |
1318 | |
1319 | nq_hdm_mbo(mbo); | |
1320 | return 0; | |
1321 | } | |
1322 | EXPORT_SYMBOL_GPL(most_submit_mbo); | |
1323 | ||
1324 | /** | |
1325 | * most_write_completion - write completion handler | |
1326 | * @mbo: pointer to MBO | |
1327 | * | |
1328 | * This recycles the MBO for further usage. In case the channel has been | |
1329 | * poisoned, the MBO is scheduled to be trashed. | |
1330 | */ | |
1331 | static void most_write_completion(struct mbo *mbo) | |
1332 | { | |
1333 | struct most_c_obj *c; | |
1334 | ||
1335 | BUG_ON((!mbo) || (!mbo->context)); | |
1336 | ||
1337 | c = mbo->context; | |
1338 | if (mbo->status == MBO_E_INVAL) | |
1339 | pr_info("WARN: Tx MBO status: invalid\n"); | |
ec58d2a8 | 1340 | if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) |
57562a72 CG |
1341 | trash_mbo(mbo); |
1342 | else | |
1343 | arm_mbo(mbo); | |
1344 | } | |
1345 | ||
1346 | /** | |
1347 | * get_channel_by_iface - get pointer to channel object | |
1348 | * @iface: pointer to interface instance | |
1349 | * @id: channel ID | |
1350 | * | |
1351 | * This retrieves a pointer to a channel of the given interface and channel ID. | |
1352 | */ | |
1353 | static struct | |
1354 | most_c_obj *get_channel_by_iface(struct most_interface *iface, int id) | |
1355 | { | |
1356 | struct most_inst_obj *i; | |
1357 | ||
1358 | if (unlikely(!iface)) { | |
1359 | pr_err("Bad interface\n"); | |
1360 | return NULL; | |
1361 | } | |
1362 | if (unlikely((id < 0) || (id >= iface->num_channels))) { | |
1363 | pr_err("Channel index (%d) out of range\n", id); | |
1364 | return NULL; | |
1365 | } | |
1366 | i = iface->priv; | |
1367 | if (unlikely(!i)) { | |
1368 | pr_err("interface is not registered\n"); | |
1369 | return NULL; | |
1370 | } | |
1371 | return i->channel[id]; | |
1372 | } | |
1373 | ||
cdc293d5 | 1374 | int channel_has_mbo(struct most_interface *iface, int id, struct most_aim *aim) |
aac997df CG |
1375 | { |
1376 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1377 | unsigned long flags; | |
1378 | int empty; | |
1379 | ||
1380 | if (unlikely(!c)) | |
1381 | return -EINVAL; | |
1382 | ||
cdc293d5 CG |
1383 | if (c->aim0.refs && c->aim1.refs && |
1384 | ((aim == c->aim0.ptr && c->aim0.num_buffers <= 0) || | |
1385 | (aim == c->aim1.ptr && c->aim1.num_buffers <= 0))) | |
1386 | return 0; | |
1387 | ||
aac997df CG |
1388 | spin_lock_irqsave(&c->fifo_lock, flags); |
1389 | empty = list_empty(&c->fifo); | |
1390 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1391 | return !empty; | |
1392 | } | |
1393 | EXPORT_SYMBOL_GPL(channel_has_mbo); | |
1394 | ||
57562a72 CG |
1395 | /** |
1396 | * most_get_mbo - get pointer to an MBO of pool | |
1397 | * @iface: pointer to interface instance | |
1398 | * @id: channel ID | |
1399 | * | |
1400 | * This attempts to get a free buffer out of the channel fifo. | |
1401 | * Returns a pointer to MBO on success or NULL otherwise. | |
1402 | */ | |
71457d48 CG |
1403 | struct mbo *most_get_mbo(struct most_interface *iface, int id, |
1404 | struct most_aim *aim) | |
57562a72 CG |
1405 | { |
1406 | struct mbo *mbo; | |
1407 | struct most_c_obj *c; | |
1408 | unsigned long flags; | |
71457d48 | 1409 | int *num_buffers_ptr; |
57562a72 CG |
1410 | |
1411 | c = get_channel_by_iface(iface, id); | |
1412 | if (unlikely(!c)) | |
1413 | return NULL; | |
71457d48 | 1414 | |
ccfbaee0 CG |
1415 | if (c->aim0.refs && c->aim1.refs && |
1416 | ((aim == c->aim0.ptr && c->aim0.num_buffers <= 0) || | |
1417 | (aim == c->aim1.ptr && c->aim1.num_buffers <= 0))) | |
71457d48 CG |
1418 | return NULL; |
1419 | ||
ccfbaee0 CG |
1420 | if (aim == c->aim0.ptr) |
1421 | num_buffers_ptr = &c->aim0.num_buffers; | |
1422 | else if (aim == c->aim1.ptr) | |
1423 | num_buffers_ptr = &c->aim1.num_buffers; | |
71457d48 CG |
1424 | else |
1425 | num_buffers_ptr = &dummy_num_buffers; | |
1426 | ||
57562a72 CG |
1427 | spin_lock_irqsave(&c->fifo_lock, flags); |
1428 | if (list_empty(&c->fifo)) { | |
1429 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1430 | return NULL; | |
1431 | } | |
1432 | mbo = list_pop_mbo(&c->fifo); | |
71457d48 | 1433 | --*num_buffers_ptr; |
57562a72 | 1434 | spin_unlock_irqrestore(&c->fifo_lock, flags); |
71457d48 CG |
1435 | |
1436 | mbo->num_buffers_ptr = num_buffers_ptr; | |
57562a72 CG |
1437 | mbo->buffer_length = c->cfg.buffer_size; |
1438 | return mbo; | |
1439 | } | |
1440 | EXPORT_SYMBOL_GPL(most_get_mbo); | |
1441 | ||
57562a72 CG |
1442 | /** |
1443 | * most_put_mbo - return buffer to pool | |
1444 | * @mbo: buffer object | |
1445 | */ | |
1446 | void most_put_mbo(struct mbo *mbo) | |
1447 | { | |
6ed90e36 | 1448 | struct most_c_obj *c = mbo->context; |
57562a72 | 1449 | |
57562a72 CG |
1450 | if (c->cfg.direction == MOST_CH_TX) { |
1451 | arm_mbo(mbo); | |
1452 | return; | |
1453 | } | |
1454 | nq_hdm_mbo(mbo); | |
1455 | atomic_inc(&c->mbo_nq_level); | |
1456 | } | |
1457 | EXPORT_SYMBOL_GPL(most_put_mbo); | |
1458 | ||
1459 | /** | |
1460 | * most_read_completion - read completion handler | |
1461 | * @mbo: pointer to MBO | |
1462 | * | |
1463 | * This function is called by the HDM when data has been received from the | |
1464 | * hardware and copied to the buffer of the MBO. | |
1465 | * | |
1466 | * In case the channel has been poisoned it puts the buffer in the trash queue. | |
1467 | * Otherwise, it passes the buffer to an AIM for further processing. | |
1468 | */ | |
1469 | static void most_read_completion(struct mbo *mbo) | |
1470 | { | |
f13f6981 | 1471 | struct most_c_obj *c = mbo->context; |
57562a72 | 1472 | |
f13f6981 CG |
1473 | if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) { |
1474 | trash_mbo(mbo); | |
1475 | return; | |
1476 | } | |
57562a72 CG |
1477 | |
1478 | if (mbo->status == MBO_E_INVAL) { | |
1479 | nq_hdm_mbo(mbo); | |
1480 | atomic_inc(&c->mbo_nq_level); | |
1481 | return; | |
1482 | } | |
1483 | ||
5a63e23a | 1484 | if (atomic_sub_and_test(1, &c->mbo_nq_level)) |
57562a72 | 1485 | c->is_starving = 1; |
57562a72 | 1486 | |
ccfbaee0 CG |
1487 | if (c->aim0.refs && c->aim0.ptr->rx_completion && |
1488 | c->aim0.ptr->rx_completion(mbo) == 0) | |
57562a72 | 1489 | return; |
f13f6981 | 1490 | |
ccfbaee0 CG |
1491 | if (c->aim1.refs && c->aim1.ptr->rx_completion && |
1492 | c->aim1.ptr->rx_completion(mbo) == 0) | |
57562a72 | 1493 | return; |
f13f6981 CG |
1494 | |
1495 | most_put_mbo(mbo); | |
57562a72 CG |
1496 | } |
1497 | ||
1498 | /** | |
1499 | * most_start_channel - prepares a channel for communication | |
1500 | * @iface: pointer to interface instance | |
1501 | * @id: channel ID | |
1502 | * | |
1503 | * This prepares the channel for usage. Cross-checks whether the | |
1504 | * channel's been properly configured. | |
1505 | * | |
1506 | * Returns 0 on success or error code otherwise. | |
1507 | */ | |
f13f6981 CG |
1508 | int most_start_channel(struct most_interface *iface, int id, |
1509 | struct most_aim *aim) | |
57562a72 CG |
1510 | { |
1511 | int num_buffer; | |
1512 | int ret; | |
1513 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1514 | ||
1515 | if (unlikely(!c)) | |
1516 | return -EINVAL; | |
1517 | ||
f13f6981 | 1518 | mutex_lock(&c->start_mutex); |
ccfbaee0 | 1519 | if (c->aim0.refs + c->aim1.refs > 0) |
f13f6981 | 1520 | goto out; /* already started by other aim */ |
57562a72 CG |
1521 | |
1522 | if (!try_module_get(iface->mod)) { | |
1523 | pr_info("failed to acquire HDM lock\n"); | |
f13f6981 | 1524 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1525 | return -ENOLCK; |
1526 | } | |
57562a72 CG |
1527 | |
1528 | c->cfg.extra_len = 0; | |
1529 | if (c->iface->configure(c->iface, c->channel_id, &c->cfg)) { | |
1530 | pr_info("channel configuration failed. Go check settings...\n"); | |
1531 | ret = -EINVAL; | |
1532 | goto error; | |
1533 | } | |
1534 | ||
1535 | init_waitqueue_head(&c->hdm_fifo_wq); | |
1536 | ||
1537 | if (c->cfg.direction == MOST_CH_RX) | |
1538 | num_buffer = arm_mbo_chain(c, c->cfg.direction, | |
1539 | most_read_completion); | |
1540 | else | |
1541 | num_buffer = arm_mbo_chain(c, c->cfg.direction, | |
1542 | most_write_completion); | |
47af41b0 | 1543 | if (unlikely(!num_buffer)) { |
57562a72 CG |
1544 | pr_info("failed to allocate memory\n"); |
1545 | ret = -ENOMEM; | |
1546 | goto error; | |
1547 | } | |
1548 | ||
1549 | ret = run_enqueue_thread(c, id); | |
1550 | if (ret) | |
1551 | goto error; | |
1552 | ||
57562a72 | 1553 | c->is_starving = 0; |
ccfbaee0 CG |
1554 | c->aim0.num_buffers = c->cfg.num_buffers / 2; |
1555 | c->aim1.num_buffers = c->cfg.num_buffers - c->aim0.num_buffers; | |
57562a72 | 1556 | atomic_set(&c->mbo_ref, num_buffer); |
f13f6981 CG |
1557 | |
1558 | out: | |
ccfbaee0 CG |
1559 | if (aim == c->aim0.ptr) |
1560 | c->aim0.refs++; | |
1561 | if (aim == c->aim1.ptr) | |
1562 | c->aim1.refs++; | |
f13f6981 | 1563 | mutex_unlock(&c->start_mutex); |
57562a72 | 1564 | return 0; |
f13f6981 | 1565 | |
57562a72 | 1566 | error: |
e23afff9 | 1567 | module_put(iface->mod); |
f13f6981 | 1568 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1569 | return ret; |
1570 | } | |
1571 | EXPORT_SYMBOL_GPL(most_start_channel); | |
1572 | ||
1573 | /** | |
1574 | * most_stop_channel - stops a running channel | |
1575 | * @iface: pointer to interface instance | |
1576 | * @id: channel ID | |
1577 | */ | |
f13f6981 CG |
1578 | int most_stop_channel(struct most_interface *iface, int id, |
1579 | struct most_aim *aim) | |
57562a72 CG |
1580 | { |
1581 | struct most_c_obj *c; | |
1582 | ||
1583 | if (unlikely((!iface) || (id >= iface->num_channels) || (id < 0))) { | |
1584 | pr_err("Bad interface or index out of range\n"); | |
1585 | return -EINVAL; | |
1586 | } | |
1587 | c = get_channel_by_iface(iface, id); | |
1588 | if (unlikely(!c)) | |
1589 | return -EINVAL; | |
1590 | ||
f13f6981 | 1591 | mutex_lock(&c->start_mutex); |
ccfbaee0 | 1592 | if (c->aim0.refs + c->aim1.refs >= 2) |
f13f6981 | 1593 | goto out; |
57562a72 | 1594 | |
57562a72 CG |
1595 | if (c->hdm_enqueue_task) |
1596 | kthread_stop(c->hdm_enqueue_task); | |
1597 | c->hdm_enqueue_task = NULL; | |
57562a72 | 1598 | |
9cda3007 | 1599 | if (iface->mod) |
57562a72 | 1600 | module_put(iface->mod); |
57562a72 CG |
1601 | |
1602 | c->is_poisoned = true; | |
1603 | if (c->iface->poison_channel(c->iface, c->channel_id)) { | |
1604 | pr_err("Cannot stop channel %d of mdev %s\n", c->channel_id, | |
1605 | c->iface->description); | |
f13f6981 | 1606 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1607 | return -EAGAIN; |
1608 | } | |
1609 | flush_trash_fifo(c); | |
1610 | flush_channel_fifos(c); | |
1611 | ||
1612 | #ifdef CMPL_INTERRUPTIBLE | |
1613 | if (wait_for_completion_interruptible(&c->cleanup)) { | |
1614 | pr_info("Interrupted while clean up ch %d\n", c->channel_id); | |
f13f6981 | 1615 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1616 | return -EINTR; |
1617 | } | |
1618 | #else | |
1619 | wait_for_completion(&c->cleanup); | |
1620 | #endif | |
1621 | c->is_poisoned = false; | |
f13f6981 CG |
1622 | |
1623 | out: | |
ccfbaee0 CG |
1624 | if (aim == c->aim0.ptr) |
1625 | c->aim0.refs--; | |
1626 | if (aim == c->aim1.ptr) | |
1627 | c->aim1.refs--; | |
f13f6981 | 1628 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1629 | return 0; |
1630 | } | |
1631 | EXPORT_SYMBOL_GPL(most_stop_channel); | |
1632 | ||
1633 | /** | |
1634 | * most_register_aim - registers an AIM (driver) with the core | |
1635 | * @aim: instance of AIM to be registered | |
1636 | */ | |
1637 | int most_register_aim(struct most_aim *aim) | |
1638 | { | |
1639 | struct most_aim_obj *aim_obj; | |
1640 | ||
1641 | if (!aim) { | |
1642 | pr_err("Bad driver\n"); | |
1643 | return -EINVAL; | |
1644 | } | |
1645 | aim_obj = create_most_aim_obj(aim->name); | |
1646 | if (!aim_obj) { | |
1647 | pr_info("failed to alloc driver object\n"); | |
1648 | return -ENOMEM; | |
1649 | } | |
1650 | aim_obj->driver = aim; | |
1651 | aim->context = aim_obj; | |
1652 | pr_info("registered new application interfacing module %s\n", | |
1653 | aim->name); | |
1654 | list_add_tail(&aim_obj->list, &aim_list); | |
1655 | return 0; | |
1656 | } | |
1657 | EXPORT_SYMBOL_GPL(most_register_aim); | |
1658 | ||
1659 | /** | |
1660 | * most_deregister_aim - deregisters an AIM (driver) with the core | |
1661 | * @aim: AIM to be removed | |
1662 | */ | |
1663 | int most_deregister_aim(struct most_aim *aim) | |
1664 | { | |
1665 | struct most_aim_obj *aim_obj; | |
1666 | struct most_c_obj *c, *tmp; | |
1667 | struct most_inst_obj *i, *i_tmp; | |
1668 | ||
1669 | if (!aim) { | |
1670 | pr_err("Bad driver\n"); | |
1671 | return -EINVAL; | |
1672 | } | |
1673 | ||
1674 | aim_obj = aim->context; | |
1675 | if (!aim_obj) { | |
1676 | pr_info("driver not registered.\n"); | |
1677 | return -EINVAL; | |
1678 | } | |
1679 | list_for_each_entry_safe(i, i_tmp, &instance_list, list) { | |
1680 | list_for_each_entry_safe(c, tmp, &i->channel_list, list) { | |
ccfbaee0 | 1681 | if (c->aim0.ptr == aim || c->aim1.ptr == aim) |
57562a72 CG |
1682 | aim->disconnect_channel( |
1683 | c->iface, c->channel_id); | |
ccfbaee0 CG |
1684 | if (c->aim0.ptr == aim) |
1685 | c->aim0.ptr = NULL; | |
1686 | if (c->aim1.ptr == aim) | |
1687 | c->aim1.ptr = NULL; | |
57562a72 CG |
1688 | } |
1689 | } | |
1690 | list_del(&aim_obj->list); | |
1691 | destroy_most_aim_obj(aim_obj); | |
1692 | pr_info("deregistering application interfacing module %s\n", aim->name); | |
1693 | return 0; | |
1694 | } | |
1695 | EXPORT_SYMBOL_GPL(most_deregister_aim); | |
1696 | ||
1697 | /** | |
1698 | * most_register_interface - registers an interface with core | |
1699 | * @iface: pointer to the instance of the interface description. | |
1700 | * | |
1701 | * Allocates and initializes a new interface instance and all of its channels. | |
1702 | * Returns a pointer to kobject or an error pointer. | |
1703 | */ | |
1704 | struct kobject *most_register_interface(struct most_interface *iface) | |
1705 | { | |
1706 | unsigned int i; | |
1707 | int id; | |
1708 | char name[STRING_SIZE]; | |
1709 | char channel_name[STRING_SIZE]; | |
1710 | struct most_c_obj *c; | |
1711 | struct most_inst_obj *inst; | |
1712 | ||
1713 | if (!iface || !iface->enqueue || !iface->configure || | |
1714 | !iface->poison_channel || (iface->num_channels > MAX_CHANNELS)) { | |
1715 | pr_err("Bad interface or channel overflow\n"); | |
1716 | return ERR_PTR(-EINVAL); | |
1717 | } | |
1718 | ||
1719 | id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL); | |
1720 | if (id < 0) { | |
1721 | pr_info("Failed to alloc mdev ID\n"); | |
1722 | return ERR_PTR(id); | |
1723 | } | |
1724 | snprintf(name, STRING_SIZE, "mdev%d", id); | |
1725 | ||
1726 | inst = create_most_inst_obj(name); | |
1727 | if (!inst) { | |
1728 | pr_info("Failed to allocate interface instance\n"); | |
b7382d44 | 1729 | ida_simple_remove(&mdev_id, id); |
57562a72 CG |
1730 | return ERR_PTR(-ENOMEM); |
1731 | } | |
1732 | ||
1733 | iface->priv = inst; | |
1734 | INIT_LIST_HEAD(&inst->channel_list); | |
1735 | inst->iface = iface; | |
1736 | inst->dev_id = id; | |
57562a72 CG |
1737 | list_add_tail(&inst->list, &instance_list); |
1738 | ||
1739 | for (i = 0; i < iface->num_channels; i++) { | |
1740 | const char *name_suffix = iface->channel_vector[i].name_suffix; | |
1741 | ||
1742 | if (!name_suffix) | |
1743 | snprintf(channel_name, STRING_SIZE, "ch%d", i); | |
1744 | else if (name_suffix[0] == '@') | |
1745 | snprintf(channel_name, STRING_SIZE, "ch%d%s", i, | |
1746 | name_suffix); | |
1747 | else | |
1748 | snprintf(channel_name, STRING_SIZE, "%s", name_suffix); | |
1749 | ||
1750 | /* this increments the reference count of this instance */ | |
1751 | c = create_most_c_obj(channel_name, &inst->kobj); | |
1752 | if (!c) | |
1753 | goto free_instance; | |
1754 | inst->channel[i] = c; | |
1755 | c->is_starving = 0; | |
1756 | c->iface = iface; | |
1757 | c->inst = inst; | |
1758 | c->channel_id = i; | |
1759 | c->keep_mbo = false; | |
1760 | c->enqueue_halt = false; | |
1761 | c->is_poisoned = false; | |
57562a72 CG |
1762 | c->cfg.direction = 0; |
1763 | c->cfg.data_type = 0; | |
1764 | c->cfg.num_buffers = 0; | |
1765 | c->cfg.buffer_size = 0; | |
1766 | c->cfg.subbuffer_size = 0; | |
1767 | c->cfg.packets_per_xact = 0; | |
1768 | spin_lock_init(&c->fifo_lock); | |
1769 | INIT_LIST_HEAD(&c->fifo); | |
1770 | INIT_LIST_HEAD(&c->trash_fifo); | |
1771 | INIT_LIST_HEAD(&c->halt_fifo); | |
1772 | init_completion(&c->cleanup); | |
1773 | atomic_set(&c->mbo_ref, 0); | |
f13f6981 | 1774 | mutex_init(&c->start_mutex); |
bf9503f1 | 1775 | mutex_init(&c->nq_mutex); |
57562a72 CG |
1776 | list_add_tail(&c->list, &inst->channel_list); |
1777 | } | |
1778 | pr_info("registered new MOST device mdev%d (%s)\n", | |
1779 | inst->dev_id, iface->description); | |
1780 | return &inst->kobj; | |
1781 | ||
1782 | free_instance: | |
1783 | pr_info("Failed allocate channel(s)\n"); | |
1784 | list_del(&inst->list); | |
b7382d44 | 1785 | ida_simple_remove(&mdev_id, id); |
57562a72 CG |
1786 | destroy_most_inst_obj(inst); |
1787 | return ERR_PTR(-ENOMEM); | |
1788 | } | |
1789 | EXPORT_SYMBOL_GPL(most_register_interface); | |
1790 | ||
1791 | /** | |
1792 | * most_deregister_interface - deregisters an interface with core | |
1793 | * @iface: pointer to the interface instance description. | |
1794 | * | |
1795 | * Before removing an interface instance from the list, all running | |
1796 | * channels are stopped and poisoned. | |
1797 | */ | |
1798 | void most_deregister_interface(struct most_interface *iface) | |
1799 | { | |
1800 | struct most_inst_obj *i = iface->priv; | |
1801 | struct most_c_obj *c; | |
1802 | ||
57562a72 CG |
1803 | if (unlikely(!i)) { |
1804 | pr_info("Bad Interface\n"); | |
57562a72 CG |
1805 | return; |
1806 | } | |
1807 | pr_info("deregistering MOST device %s (%s)\n", i->kobj.name, | |
1808 | iface->description); | |
1809 | ||
a0fceb1f CG |
1810 | list_for_each_entry(c, &i->channel_list, list) { |
1811 | if (c->aim0.ptr) | |
1812 | c->aim0.ptr->disconnect_channel(c->iface, | |
1813 | c->channel_id); | |
1814 | if (c->aim1.ptr) | |
1815 | c->aim1.ptr->disconnect_channel(c->iface, | |
1816 | c->channel_id); | |
1817 | c->aim0.ptr = NULL; | |
1818 | c->aim1.ptr = NULL; | |
1819 | } | |
1820 | ||
57562a72 CG |
1821 | ida_simple_remove(&mdev_id, i->dev_id); |
1822 | list_del(&i->list); | |
1823 | destroy_most_inst_obj(i); | |
1824 | } | |
1825 | EXPORT_SYMBOL_GPL(most_deregister_interface); | |
1826 | ||
1827 | /** | |
1828 | * most_stop_enqueue - prevents core from enqueueing MBOs | |
1829 | * @iface: pointer to interface | |
1830 | * @id: channel id | |
1831 | * | |
1832 | * This is called by an HDM that _cannot_ attend to its duties and | |
1833 | * is imminent to get run over by the core. The core is not going to | |
1834 | * enqueue any further packets unless the flagging HDM calls | |
1835 | * most_resume enqueue(). | |
1836 | */ | |
1837 | void most_stop_enqueue(struct most_interface *iface, int id) | |
1838 | { | |
1839 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1840 | ||
bf9503f1 CG |
1841 | if (!c) |
1842 | return; | |
1843 | ||
1844 | mutex_lock(&c->nq_mutex); | |
1845 | c->enqueue_halt = true; | |
1846 | mutex_unlock(&c->nq_mutex); | |
57562a72 CG |
1847 | } |
1848 | EXPORT_SYMBOL_GPL(most_stop_enqueue); | |
1849 | ||
1850 | /** | |
1851 | * most_resume_enqueue - allow core to enqueue MBOs again | |
1852 | * @iface: pointer to interface | |
1853 | * @id: channel id | |
1854 | * | |
1855 | * This clears the enqueue halt flag and enqueues all MBOs currently | |
1856 | * sitting in the wait fifo. | |
1857 | */ | |
1858 | void most_resume_enqueue(struct most_interface *iface, int id) | |
1859 | { | |
1860 | struct most_c_obj *c = get_channel_by_iface(iface, id); | |
1861 | ||
bf9503f1 | 1862 | if (!c) |
57562a72 | 1863 | return; |
bf9503f1 CG |
1864 | |
1865 | mutex_lock(&c->nq_mutex); | |
57562a72 | 1866 | c->enqueue_halt = false; |
bf9503f1 | 1867 | mutex_unlock(&c->nq_mutex); |
57562a72 CG |
1868 | |
1869 | wake_up_interruptible(&c->hdm_fifo_wq); | |
1870 | } | |
1871 | EXPORT_SYMBOL_GPL(most_resume_enqueue); | |
1872 | ||
1873 | static int __init most_init(void) | |
1874 | { | |
cc4188b6 SM |
1875 | int err; |
1876 | ||
57562a72 CG |
1877 | pr_info("init()\n"); |
1878 | INIT_LIST_HEAD(&instance_list); | |
1879 | INIT_LIST_HEAD(&aim_list); | |
57562a72 CG |
1880 | ida_init(&mdev_id); |
1881 | ||
cc4188b6 SM |
1882 | err = bus_register(&most_bus); |
1883 | if (err) { | |
57562a72 | 1884 | pr_info("Cannot register most bus\n"); |
cc4188b6 | 1885 | return err; |
57562a72 CG |
1886 | } |
1887 | ||
1888 | most_class = class_create(THIS_MODULE, "most"); | |
1889 | if (IS_ERR(most_class)) { | |
1890 | pr_info("No udev support.\n"); | |
cc4188b6 | 1891 | err = PTR_ERR(most_class); |
57562a72 CG |
1892 | goto exit_bus; |
1893 | } | |
cc4188b6 SM |
1894 | |
1895 | err = driver_register(&mostcore); | |
1896 | if (err) { | |
57562a72 CG |
1897 | pr_info("Cannot register core driver\n"); |
1898 | goto exit_class; | |
1899 | } | |
1900 | ||
99d75346 CG |
1901 | core_dev = device_create(most_class, NULL, 0, NULL, "mostcore"); |
1902 | if (IS_ERR(core_dev)) { | |
1903 | err = PTR_ERR(core_dev); | |
57562a72 | 1904 | goto exit_driver; |
cc4188b6 | 1905 | } |
57562a72 | 1906 | |
99d75346 | 1907 | most_aim_kset = kset_create_and_add("aims", NULL, &core_dev->kobj); |
cc4188b6 SM |
1908 | if (!most_aim_kset) { |
1909 | err = -ENOMEM; | |
57562a72 | 1910 | goto exit_class_container; |
cc4188b6 | 1911 | } |
57562a72 | 1912 | |
99d75346 | 1913 | most_inst_kset = kset_create_and_add("devices", NULL, &core_dev->kobj); |
cc4188b6 SM |
1914 | if (!most_inst_kset) { |
1915 | err = -ENOMEM; | |
57562a72 | 1916 | goto exit_driver_kset; |
cc4188b6 | 1917 | } |
57562a72 CG |
1918 | |
1919 | return 0; | |
1920 | ||
1921 | exit_driver_kset: | |
1922 | kset_unregister(most_aim_kset); | |
1923 | exit_class_container: | |
1924 | device_destroy(most_class, 0); | |
1925 | exit_driver: | |
1926 | driver_unregister(&mostcore); | |
1927 | exit_class: | |
1928 | class_destroy(most_class); | |
1929 | exit_bus: | |
1930 | bus_unregister(&most_bus); | |
cc4188b6 | 1931 | return err; |
57562a72 CG |
1932 | } |
1933 | ||
1934 | static void __exit most_exit(void) | |
1935 | { | |
1936 | struct most_inst_obj *i, *i_tmp; | |
1937 | struct most_aim_obj *d, *d_tmp; | |
1938 | ||
1939 | pr_info("exit core module\n"); | |
1940 | list_for_each_entry_safe(d, d_tmp, &aim_list, list) { | |
1941 | destroy_most_aim_obj(d); | |
1942 | } | |
1943 | ||
1944 | list_for_each_entry_safe(i, i_tmp, &instance_list, list) { | |
1945 | list_del(&i->list); | |
1946 | destroy_most_inst_obj(i); | |
1947 | } | |
1948 | kset_unregister(most_inst_kset); | |
1949 | kset_unregister(most_aim_kset); | |
1950 | device_destroy(most_class, 0); | |
1951 | driver_unregister(&mostcore); | |
1952 | class_destroy(most_class); | |
1953 | bus_unregister(&most_bus); | |
1954 | ida_destroy(&mdev_id); | |
1955 | } | |
1956 | ||
1957 | module_init(most_init); | |
1958 | module_exit(most_exit); | |
1959 | MODULE_LICENSE("GPL"); | |
1960 | MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>"); | |
1961 | MODULE_DESCRIPTION("Core module of stacked MOST Linux driver"); |