Commit | Line | Data |
---|---|---|
1a79f22d | 1 | // SPDX-License-Identifier: GPL-2.0 |
57562a72 CG |
2 | /* |
3 | * core.c - Implementation of core module of MOST Linux driver stack | |
4 | * | |
5 | * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG | |
57562a72 CG |
6 | */ |
7 | ||
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
9 | #include <linux/module.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/poll.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/kobject.h> | |
18 | #include <linux/mutex.h> | |
19 | #include <linux/completion.h> | |
20 | #include <linux/sysfs.h> | |
21 | #include <linux/kthread.h> | |
22 | #include <linux/dma-mapping.h> | |
23 | #include <linux/idr.h> | |
057301cd | 24 | #include <most/core.h> |
57562a72 CG |
25 | |
26 | #define MAX_CHANNELS 64 | |
27 | #define STRING_SIZE 80 | |
28 | ||
57562a72 | 29 | static struct ida mdev_id; |
71457d48 | 30 | static int dummy_num_buffers; |
57562a72 | 31 | |
14ae5f03 CG |
32 | static struct mostcore { |
33 | struct device dev; | |
34 | struct device_driver drv; | |
35 | struct bus_type bus; | |
81ce26b7 | 36 | struct list_head comp_list; |
14ae5f03 CG |
37 | } mc; |
38 | ||
37d641ef | 39 | #define to_driver(d) container_of(d, struct mostcore, drv) |
14ae5f03 | 40 | |
7faeffec | 41 | struct pipe { |
5a5abf02 | 42 | struct core_component *comp; |
ccfbaee0 CG |
43 | int refs; |
44 | int num_buffers; | |
45 | }; | |
46 | ||
fcb7fad8 | 47 | struct most_channel { |
4d5f022f | 48 | struct device dev; |
57562a72 CG |
49 | struct completion cleanup; |
50 | atomic_t mbo_ref; | |
51 | atomic_t mbo_nq_level; | |
2aa9b96f | 52 | u16 channel_id; |
845101be | 53 | char name[STRING_SIZE]; |
57562a72 | 54 | bool is_poisoned; |
f13f6981 | 55 | struct mutex start_mutex; |
bf9503f1 | 56 | struct mutex nq_mutex; /* nq thread synchronization */ |
57562a72 CG |
57 | int is_starving; |
58 | struct most_interface *iface; | |
57562a72 CG |
59 | struct most_channel_config cfg; |
60 | bool keep_mbo; | |
61 | bool enqueue_halt; | |
62 | struct list_head fifo; | |
63 | spinlock_t fifo_lock; | |
64 | struct list_head halt_fifo; | |
65 | struct list_head list; | |
f898f989 CG |
66 | struct pipe pipe0; |
67 | struct pipe pipe1; | |
57562a72 CG |
68 | struct list_head trash_fifo; |
69 | struct task_struct *hdm_enqueue_task; | |
57562a72 | 70 | wait_queue_head_t hdm_fifo_wq; |
ed021a0f | 71 | |
57562a72 | 72 | }; |
9cbe5aa6 | 73 | |
fcb7fad8 | 74 | #define to_channel(d) container_of(d, struct most_channel, dev) |
57562a72 | 75 | |
9136fccf | 76 | struct interface_private { |
57562a72 | 77 | int dev_id; |
9136fccf | 78 | char name[STRING_SIZE]; |
fcb7fad8 | 79 | struct most_channel *channel[MAX_CHANNELS]; |
9136fccf | 80 | struct list_head channel_list; |
57562a72 | 81 | }; |
9cbe5aa6 | 82 | |
e7f2b70f HPGE |
83 | static const struct { |
84 | int most_ch_data_type; | |
06324664 | 85 | const char *name; |
95f73013 CG |
86 | } ch_data_type[] = { |
87 | { MOST_CH_CONTROL, "control\n" }, | |
e7f2b70f HPGE |
88 | { MOST_CH_ASYNC, "async\n" }, |
89 | { MOST_CH_SYNC, "sync\n" }, | |
0540609f AS |
90 | { MOST_CH_ISOC, "isoc\n"}, |
91 | { MOST_CH_ISOC, "isoc_avp\n"}, | |
95f73013 | 92 | }; |
e7f2b70f | 93 | |
57562a72 CG |
94 | /** |
95 | * list_pop_mbo - retrieves the first MBO of the list and removes it | |
96 | * @ptr: the list head to grab the MBO from. | |
97 | */ | |
98 | #define list_pop_mbo(ptr) \ | |
99 | ({ \ | |
100 | struct mbo *_mbo = list_first_entry(ptr, struct mbo, list); \ | |
101 | list_del(&_mbo->list); \ | |
102 | _mbo; \ | |
103 | }) | |
104 | ||
57562a72 CG |
105 | /** |
106 | * most_free_mbo_coherent - free an MBO and its coherent buffer | |
b7937dc4 | 107 | * @mbo: most buffer |
57562a72 CG |
108 | */ |
109 | static void most_free_mbo_coherent(struct mbo *mbo) | |
110 | { | |
fcb7fad8 | 111 | struct most_channel *c = mbo->context; |
57562a72 CG |
112 | u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len; |
113 | ||
3598cec5 CG |
114 | if (c->iface->dma_free) |
115 | c->iface->dma_free(mbo, coherent_buf_size); | |
116 | else | |
117 | kfree(mbo->virt_address); | |
57562a72 CG |
118 | kfree(mbo); |
119 | if (atomic_sub_and_test(1, &c->mbo_ref)) | |
120 | complete(&c->cleanup); | |
121 | } | |
122 | ||
123 | /** | |
124 | * flush_channel_fifos - clear the channel fifos | |
125 | * @c: pointer to channel object | |
126 | */ | |
fcb7fad8 | 127 | static void flush_channel_fifos(struct most_channel *c) |
57562a72 CG |
128 | { |
129 | unsigned long flags, hf_flags; | |
130 | struct mbo *mbo, *tmp; | |
131 | ||
132 | if (list_empty(&c->fifo) && list_empty(&c->halt_fifo)) | |
133 | return; | |
134 | ||
135 | spin_lock_irqsave(&c->fifo_lock, flags); | |
136 | list_for_each_entry_safe(mbo, tmp, &c->fifo, list) { | |
137 | list_del(&mbo->list); | |
138 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
0834be6c | 139 | most_free_mbo_coherent(mbo); |
57562a72 CG |
140 | spin_lock_irqsave(&c->fifo_lock, flags); |
141 | } | |
142 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
143 | ||
144 | spin_lock_irqsave(&c->fifo_lock, hf_flags); | |
145 | list_for_each_entry_safe(mbo, tmp, &c->halt_fifo, list) { | |
146 | list_del(&mbo->list); | |
147 | spin_unlock_irqrestore(&c->fifo_lock, hf_flags); | |
0834be6c | 148 | most_free_mbo_coherent(mbo); |
57562a72 CG |
149 | spin_lock_irqsave(&c->fifo_lock, hf_flags); |
150 | } | |
151 | spin_unlock_irqrestore(&c->fifo_lock, hf_flags); | |
152 | ||
153 | if (unlikely((!list_empty(&c->fifo) || !list_empty(&c->halt_fifo)))) | |
154 | pr_info("WARN: fifo | trash fifo not empty\n"); | |
155 | } | |
156 | ||
157 | /** | |
158 | * flush_trash_fifo - clear the trash fifo | |
159 | * @c: pointer to channel object | |
160 | */ | |
fcb7fad8 | 161 | static int flush_trash_fifo(struct most_channel *c) |
57562a72 CG |
162 | { |
163 | struct mbo *mbo, *tmp; | |
164 | unsigned long flags; | |
165 | ||
166 | spin_lock_irqsave(&c->fifo_lock, flags); | |
167 | list_for_each_entry_safe(mbo, tmp, &c->trash_fifo, list) { | |
168 | list_del(&mbo->list); | |
169 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
170 | most_free_mbo_coherent(mbo); | |
171 | spin_lock_irqsave(&c->fifo_lock, flags); | |
172 | } | |
173 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
174 | return 0; | |
175 | } | |
176 | ||
4d5f022f CG |
177 | static ssize_t available_directions_show(struct device *dev, |
178 | struct device_attribute *attr, | |
edaa1e33 | 179 | char *buf) |
57562a72 | 180 | { |
fcb7fad8 | 181 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
182 | unsigned int i = c->channel_id; |
183 | ||
184 | strcpy(buf, ""); | |
185 | if (c->iface->channel_vector[i].direction & MOST_CH_RX) | |
95f73013 | 186 | strcat(buf, "rx "); |
57562a72 | 187 | if (c->iface->channel_vector[i].direction & MOST_CH_TX) |
95f73013 | 188 | strcat(buf, "tx "); |
57562a72 | 189 | strcat(buf, "\n"); |
22ff195b | 190 | return strlen(buf); |
57562a72 CG |
191 | } |
192 | ||
4d5f022f CG |
193 | static ssize_t available_datatypes_show(struct device *dev, |
194 | struct device_attribute *attr, | |
57562a72 CG |
195 | char *buf) |
196 | { | |
fcb7fad8 | 197 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
198 | unsigned int i = c->channel_id; |
199 | ||
200 | strcpy(buf, ""); | |
201 | if (c->iface->channel_vector[i].data_type & MOST_CH_CONTROL) | |
202 | strcat(buf, "control "); | |
203 | if (c->iface->channel_vector[i].data_type & MOST_CH_ASYNC) | |
204 | strcat(buf, "async "); | |
205 | if (c->iface->channel_vector[i].data_type & MOST_CH_SYNC) | |
206 | strcat(buf, "sync "); | |
0540609f | 207 | if (c->iface->channel_vector[i].data_type & MOST_CH_ISOC) |
95f73013 | 208 | strcat(buf, "isoc "); |
57562a72 | 209 | strcat(buf, "\n"); |
22ff195b | 210 | return strlen(buf); |
57562a72 CG |
211 | } |
212 | ||
4d5f022f CG |
213 | static ssize_t number_of_packet_buffers_show(struct device *dev, |
214 | struct device_attribute *attr, | |
4dd7c7c7 | 215 | char *buf) |
57562a72 | 216 | { |
fcb7fad8 | 217 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
218 | unsigned int i = c->channel_id; |
219 | ||
220 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
221 | c->iface->channel_vector[i].num_buffers_packet); | |
222 | } | |
223 | ||
4d5f022f CG |
224 | static ssize_t number_of_stream_buffers_show(struct device *dev, |
225 | struct device_attribute *attr, | |
4dd7c7c7 | 226 | char *buf) |
57562a72 | 227 | { |
fcb7fad8 | 228 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
229 | unsigned int i = c->channel_id; |
230 | ||
231 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
232 | c->iface->channel_vector[i].num_buffers_streaming); | |
233 | } | |
234 | ||
4d5f022f CG |
235 | static ssize_t size_of_packet_buffer_show(struct device *dev, |
236 | struct device_attribute *attr, | |
4dd7c7c7 | 237 | char *buf) |
57562a72 | 238 | { |
fcb7fad8 | 239 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
240 | unsigned int i = c->channel_id; |
241 | ||
242 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
243 | c->iface->channel_vector[i].buffer_size_packet); | |
244 | } | |
245 | ||
4d5f022f CG |
246 | static ssize_t size_of_stream_buffer_show(struct device *dev, |
247 | struct device_attribute *attr, | |
4dd7c7c7 | 248 | char *buf) |
57562a72 | 249 | { |
fcb7fad8 | 250 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
251 | unsigned int i = c->channel_id; |
252 | ||
253 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
254 | c->iface->channel_vector[i].buffer_size_streaming); | |
255 | } | |
256 | ||
4d5f022f CG |
257 | static ssize_t channel_starving_show(struct device *dev, |
258 | struct device_attribute *attr, | |
57562a72 CG |
259 | char *buf) |
260 | { | |
fcb7fad8 | 261 | struct most_channel *c = to_channel(dev); |
4d5f022f | 262 | |
57562a72 CG |
263 | return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving); |
264 | } | |
265 | ||
4d5f022f CG |
266 | static ssize_t set_number_of_buffers_show(struct device *dev, |
267 | struct device_attribute *attr, | |
57562a72 CG |
268 | char *buf) |
269 | { | |
fcb7fad8 | 270 | struct most_channel *c = to_channel(dev); |
4d5f022f | 271 | |
57562a72 CG |
272 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers); |
273 | } | |
274 | ||
4d5f022f CG |
275 | static ssize_t set_number_of_buffers_store(struct device *dev, |
276 | struct device_attribute *attr, | |
57562a72 CG |
277 | const char *buf, |
278 | size_t count) | |
279 | { | |
fcb7fad8 | 280 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
281 | int ret = kstrtou16(buf, 0, &c->cfg.num_buffers); |
282 | ||
283 | if (ret) | |
284 | return ret; | |
285 | return count; | |
286 | } | |
287 | ||
4d5f022f CG |
288 | static ssize_t set_buffer_size_show(struct device *dev, |
289 | struct device_attribute *attr, | |
57562a72 CG |
290 | char *buf) |
291 | { | |
fcb7fad8 | 292 | struct most_channel *c = to_channel(dev); |
4d5f022f | 293 | |
57562a72 CG |
294 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size); |
295 | } | |
296 | ||
4d5f022f CG |
297 | static ssize_t set_buffer_size_store(struct device *dev, |
298 | struct device_attribute *attr, | |
57562a72 CG |
299 | const char *buf, |
300 | size_t count) | |
301 | { | |
fcb7fad8 | 302 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
303 | int ret = kstrtou16(buf, 0, &c->cfg.buffer_size); |
304 | ||
305 | if (ret) | |
306 | return ret; | |
307 | return count; | |
308 | } | |
309 | ||
4d5f022f CG |
310 | static ssize_t set_direction_show(struct device *dev, |
311 | struct device_attribute *attr, | |
57562a72 CG |
312 | char *buf) |
313 | { | |
fcb7fad8 | 314 | struct most_channel *c = to_channel(dev); |
4d5f022f | 315 | |
57562a72 | 316 | if (c->cfg.direction & MOST_CH_TX) |
95f73013 | 317 | return snprintf(buf, PAGE_SIZE, "tx\n"); |
57562a72 | 318 | else if (c->cfg.direction & MOST_CH_RX) |
95f73013 | 319 | return snprintf(buf, PAGE_SIZE, "rx\n"); |
57562a72 CG |
320 | return snprintf(buf, PAGE_SIZE, "unconfigured\n"); |
321 | } | |
322 | ||
4d5f022f CG |
323 | static ssize_t set_direction_store(struct device *dev, |
324 | struct device_attribute *attr, | |
57562a72 CG |
325 | const char *buf, |
326 | size_t count) | |
327 | { | |
fcb7fad8 | 328 | struct most_channel *c = to_channel(dev); |
4d5f022f | 329 | |
9deba73d | 330 | if (!strcmp(buf, "dir_rx\n")) { |
57562a72 | 331 | c->cfg.direction = MOST_CH_RX; |
95f73013 CG |
332 | } else if (!strcmp(buf, "rx\n")) { |
333 | c->cfg.direction = MOST_CH_RX; | |
9deba73d | 334 | } else if (!strcmp(buf, "dir_tx\n")) { |
57562a72 | 335 | c->cfg.direction = MOST_CH_TX; |
95f73013 CG |
336 | } else if (!strcmp(buf, "tx\n")) { |
337 | c->cfg.direction = MOST_CH_TX; | |
9deba73d | 338 | } else { |
57562a72 CG |
339 | pr_info("WARN: invalid attribute settings\n"); |
340 | return -EINVAL; | |
341 | } | |
342 | return count; | |
343 | } | |
344 | ||
4d5f022f CG |
345 | static ssize_t set_datatype_show(struct device *dev, |
346 | struct device_attribute *attr, | |
57562a72 CG |
347 | char *buf) |
348 | { | |
e7f2b70f | 349 | int i; |
fcb7fad8 | 350 | struct most_channel *c = to_channel(dev); |
e7f2b70f HPGE |
351 | |
352 | for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) { | |
353 | if (c->cfg.data_type & ch_data_type[i].most_ch_data_type) | |
13c45007 | 354 | return snprintf(buf, PAGE_SIZE, "%s", ch_data_type[i].name); |
e7f2b70f | 355 | } |
57562a72 CG |
356 | return snprintf(buf, PAGE_SIZE, "unconfigured\n"); |
357 | } | |
358 | ||
4d5f022f CG |
359 | static ssize_t set_datatype_store(struct device *dev, |
360 | struct device_attribute *attr, | |
57562a72 CG |
361 | const char *buf, |
362 | size_t count) | |
363 | { | |
e7f2b70f | 364 | int i; |
fcb7fad8 | 365 | struct most_channel *c = to_channel(dev); |
e7f2b70f HPGE |
366 | |
367 | for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) { | |
368 | if (!strcmp(buf, ch_data_type[i].name)) { | |
369 | c->cfg.data_type = ch_data_type[i].most_ch_data_type; | |
370 | break; | |
371 | } | |
372 | } | |
373 | ||
374 | if (i == ARRAY_SIZE(ch_data_type)) { | |
57562a72 CG |
375 | pr_info("WARN: invalid attribute settings\n"); |
376 | return -EINVAL; | |
377 | } | |
378 | return count; | |
379 | } | |
380 | ||
4d5f022f CG |
381 | static ssize_t set_subbuffer_size_show(struct device *dev, |
382 | struct device_attribute *attr, | |
57562a72 CG |
383 | char *buf) |
384 | { | |
fcb7fad8 | 385 | struct most_channel *c = to_channel(dev); |
4d5f022f | 386 | |
57562a72 CG |
387 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size); |
388 | } | |
389 | ||
4d5f022f CG |
390 | static ssize_t set_subbuffer_size_store(struct device *dev, |
391 | struct device_attribute *attr, | |
57562a72 CG |
392 | const char *buf, |
393 | size_t count) | |
394 | { | |
fcb7fad8 | 395 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
396 | int ret = kstrtou16(buf, 0, &c->cfg.subbuffer_size); |
397 | ||
398 | if (ret) | |
399 | return ret; | |
400 | return count; | |
401 | } | |
402 | ||
4d5f022f CG |
403 | static ssize_t set_packets_per_xact_show(struct device *dev, |
404 | struct device_attribute *attr, | |
57562a72 CG |
405 | char *buf) |
406 | { | |
fcb7fad8 | 407 | struct most_channel *c = to_channel(dev); |
4d5f022f | 408 | |
57562a72 CG |
409 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact); |
410 | } | |
411 | ||
4d5f022f CG |
412 | static ssize_t set_packets_per_xact_store(struct device *dev, |
413 | struct device_attribute *attr, | |
57562a72 CG |
414 | const char *buf, |
415 | size_t count) | |
416 | { | |
fcb7fad8 | 417 | struct most_channel *c = to_channel(dev); |
57562a72 CG |
418 | int ret = kstrtou16(buf, 0, &c->cfg.packets_per_xact); |
419 | ||
420 | if (ret) | |
421 | return ret; | |
422 | return count; | |
423 | } | |
424 | ||
dbd36d57 CG |
425 | static ssize_t set_dbr_size_show(struct device *dev, |
426 | struct device_attribute *attr, char *buf) | |
427 | { | |
428 | struct most_channel *c = to_channel(dev); | |
429 | ||
430 | return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.dbr_size); | |
431 | } | |
432 | ||
433 | static ssize_t set_dbr_size_store(struct device *dev, | |
434 | struct device_attribute *attr, | |
435 | const char *buf, size_t count) | |
436 | { | |
437 | struct most_channel *c = to_channel(dev); | |
438 | int ret = kstrtou16(buf, 0, &c->cfg.dbr_size); | |
439 | ||
440 | if (ret) | |
441 | return ret; | |
442 | return count; | |
443 | } | |
444 | ||
4ad86623 CG |
445 | #define to_dev_attr(a) container_of(a, struct device_attribute, attr) |
446 | static umode_t channel_attr_is_visible(struct kobject *kobj, | |
447 | struct attribute *attr, int index) | |
448 | { | |
449 | struct device_attribute *dev_attr = to_dev_attr(attr); | |
450 | struct device *dev = kobj_to_dev(kobj); | |
451 | struct most_channel *c = to_channel(dev); | |
452 | ||
453 | if (!strcmp(dev_attr->attr.name, "set_dbr_size") && | |
454 | (c->iface->interface != ITYPE_MEDIALB_DIM2)) | |
455 | return 0; | |
456 | if (!strcmp(dev_attr->attr.name, "set_packets_per_xact") && | |
457 | (c->iface->interface != ITYPE_USB)) | |
458 | return 0; | |
459 | ||
460 | return attr->mode; | |
461 | } | |
462 | ||
4d5f022f CG |
463 | #define DEV_ATTR(_name) (&dev_attr_##_name.attr) |
464 | ||
465 | static DEVICE_ATTR_RO(available_directions); | |
466 | static DEVICE_ATTR_RO(available_datatypes); | |
467 | static DEVICE_ATTR_RO(number_of_packet_buffers); | |
468 | static DEVICE_ATTR_RO(number_of_stream_buffers); | |
469 | static DEVICE_ATTR_RO(size_of_stream_buffer); | |
470 | static DEVICE_ATTR_RO(size_of_packet_buffer); | |
471 | static DEVICE_ATTR_RO(channel_starving); | |
472 | static DEVICE_ATTR_RW(set_buffer_size); | |
473 | static DEVICE_ATTR_RW(set_number_of_buffers); | |
474 | static DEVICE_ATTR_RW(set_direction); | |
475 | static DEVICE_ATTR_RW(set_datatype); | |
476 | static DEVICE_ATTR_RW(set_subbuffer_size); | |
477 | static DEVICE_ATTR_RW(set_packets_per_xact); | |
dbd36d57 | 478 | static DEVICE_ATTR_RW(set_dbr_size); |
4d5f022f CG |
479 | |
480 | static struct attribute *channel_attrs[] = { | |
481 | DEV_ATTR(available_directions), | |
482 | DEV_ATTR(available_datatypes), | |
483 | DEV_ATTR(number_of_packet_buffers), | |
484 | DEV_ATTR(number_of_stream_buffers), | |
485 | DEV_ATTR(size_of_stream_buffer), | |
486 | DEV_ATTR(size_of_packet_buffer), | |
487 | DEV_ATTR(channel_starving), | |
488 | DEV_ATTR(set_buffer_size), | |
489 | DEV_ATTR(set_number_of_buffers), | |
490 | DEV_ATTR(set_direction), | |
491 | DEV_ATTR(set_datatype), | |
492 | DEV_ATTR(set_subbuffer_size), | |
493 | DEV_ATTR(set_packets_per_xact), | |
dbd36d57 | 494 | DEV_ATTR(set_dbr_size), |
57562a72 CG |
495 | NULL, |
496 | }; | |
497 | ||
4d5f022f CG |
498 | static struct attribute_group channel_attr_group = { |
499 | .attrs = channel_attrs, | |
4ad86623 | 500 | .is_visible = channel_attr_is_visible, |
57562a72 CG |
501 | }; |
502 | ||
4d5f022f CG |
503 | static const struct attribute_group *channel_attr_groups[] = { |
504 | &channel_attr_group, | |
505 | NULL, | |
506 | }; | |
57562a72 | 507 | |
4d5f022f CG |
508 | static ssize_t description_show(struct device *dev, |
509 | struct device_attribute *attr, | |
57562a72 CG |
510 | char *buf) |
511 | { | |
4d5f022f CG |
512 | struct most_interface *iface = to_most_interface(dev); |
513 | ||
514 | return snprintf(buf, PAGE_SIZE, "%s\n", iface->description); | |
57562a72 CG |
515 | } |
516 | ||
4d5f022f CG |
517 | static ssize_t interface_show(struct device *dev, |
518 | struct device_attribute *attr, | |
57562a72 CG |
519 | char *buf) |
520 | { | |
4d5f022f CG |
521 | struct most_interface *iface = to_most_interface(dev); |
522 | ||
523 | switch (iface->interface) { | |
57562a72 CG |
524 | case ITYPE_LOOPBACK: |
525 | return snprintf(buf, PAGE_SIZE, "loopback\n"); | |
526 | case ITYPE_I2C: | |
527 | return snprintf(buf, PAGE_SIZE, "i2c\n"); | |
528 | case ITYPE_I2S: | |
529 | return snprintf(buf, PAGE_SIZE, "i2s\n"); | |
530 | case ITYPE_TSI: | |
531 | return snprintf(buf, PAGE_SIZE, "tsi\n"); | |
532 | case ITYPE_HBI: | |
533 | return snprintf(buf, PAGE_SIZE, "hbi\n"); | |
534 | case ITYPE_MEDIALB_DIM: | |
535 | return snprintf(buf, PAGE_SIZE, "mlb_dim\n"); | |
536 | case ITYPE_MEDIALB_DIM2: | |
537 | return snprintf(buf, PAGE_SIZE, "mlb_dim2\n"); | |
538 | case ITYPE_USB: | |
539 | return snprintf(buf, PAGE_SIZE, "usb\n"); | |
540 | case ITYPE_PCIE: | |
541 | return snprintf(buf, PAGE_SIZE, "pcie\n"); | |
542 | } | |
543 | return snprintf(buf, PAGE_SIZE, "unknown\n"); | |
544 | } | |
545 | ||
4d5f022f CG |
546 | static DEVICE_ATTR_RO(description); |
547 | static DEVICE_ATTR_RO(interface); | |
57562a72 | 548 | |
4d5f022f CG |
549 | static struct attribute *interface_attrs[] = { |
550 | DEV_ATTR(description), | |
551 | DEV_ATTR(interface), | |
57562a72 CG |
552 | NULL, |
553 | }; | |
554 | ||
4d5f022f CG |
555 | static struct attribute_group interface_attr_group = { |
556 | .attrs = interface_attrs, | |
57562a72 CG |
557 | }; |
558 | ||
4d5f022f CG |
559 | static const struct attribute_group *interface_attr_groups[] = { |
560 | &interface_attr_group, | |
561 | NULL, | |
562 | }; | |
57562a72 | 563 | |
fdbdc0e6 | 564 | static struct core_component *match_component(char *name) |
bdafb7e8 | 565 | { |
5a5abf02 | 566 | struct core_component *comp; |
bdafb7e8 | 567 | |
5a5abf02 CG |
568 | list_for_each_entry(comp, &mc.comp_list, list) { |
569 | if (!strcmp(comp->name, name)) | |
570 | return comp; | |
bdafb7e8 CG |
571 | } |
572 | return NULL; | |
573 | } | |
574 | ||
e7e3ce04 AS |
575 | struct show_links_data { |
576 | int offs; | |
577 | char *buf; | |
578 | }; | |
579 | ||
845c31de | 580 | static int print_links(struct device *dev, void *data) |
57562a72 | 581 | { |
e7e3ce04 AS |
582 | struct show_links_data *d = data; |
583 | int offs = d->offs; | |
584 | char *buf = d->buf; | |
9136fccf CG |
585 | struct most_channel *c; |
586 | struct most_interface *iface = to_most_interface(dev); | |
bc5f96a1 | 587 | |
9136fccf | 588 | list_for_each_entry(c, &iface->p->channel_list, list) { |
5a5abf02 | 589 | if (c->pipe0.comp) { |
9136fccf CG |
590 | offs += snprintf(buf + offs, |
591 | PAGE_SIZE - offs, | |
592 | "%s:%s:%s\n", | |
5a5abf02 | 593 | c->pipe0.comp->name, |
9136fccf CG |
594 | dev_name(&iface->dev), |
595 | dev_name(&c->dev)); | |
596 | } | |
5a5abf02 | 597 | if (c->pipe1.comp) { |
9136fccf CG |
598 | offs += snprintf(buf + offs, |
599 | PAGE_SIZE - offs, | |
600 | "%s:%s:%s\n", | |
5a5abf02 | 601 | c->pipe1.comp->name, |
9136fccf CG |
602 | dev_name(&iface->dev), |
603 | dev_name(&c->dev)); | |
bc5f96a1 CG |
604 | } |
605 | } | |
e7e3ce04 | 606 | d->offs = offs; |
9136fccf CG |
607 | return 0; |
608 | } | |
609 | ||
610 | static ssize_t links_show(struct device_driver *drv, char *buf) | |
611 | { | |
e7e3ce04 AS |
612 | struct show_links_data d = { .buf = buf }; |
613 | ||
614 | bus_for_each_dev(&mc.bus, NULL, &d, print_links); | |
615 | return d.offs; | |
57562a72 CG |
616 | } |
617 | ||
fdbdc0e6 | 618 | static ssize_t components_show(struct device_driver *drv, char *buf) |
bdafb7e8 | 619 | { |
5a5abf02 | 620 | struct core_component *comp; |
bdafb7e8 CG |
621 | int offs = 0; |
622 | ||
5a5abf02 | 623 | list_for_each_entry(comp, &mc.comp_list, list) { |
bdafb7e8 | 624 | offs += snprintf(buf + offs, PAGE_SIZE - offs, "%s\n", |
5a5abf02 | 625 | comp->name); |
bdafb7e8 CG |
626 | } |
627 | return offs; | |
628 | } | |
ed49a3bd | 629 | |
57562a72 | 630 | /** |
b7937dc4 | 631 | * split_string - parses buf and extracts ':' separated substrings. |
57562a72 CG |
632 | * |
633 | * @buf: complete string from attribute 'add_channel' | |
b7937dc4 CG |
634 | * @a: storage for 1st substring (=interface name) |
635 | * @b: storage for 2nd substring (=channel name) | |
636 | * @c: storage for 3rd substring (=component name) | |
637 | * @d: storage optional 4th substring (=user defined name) | |
57562a72 CG |
638 | * |
639 | * Examples: | |
640 | * | |
b7937dc4 CG |
641 | * Input: "mdev0:ch6:cdev:my_channel\n" or |
642 | * "mdev0:ch6:cdev:my_channel" | |
57562a72 | 643 | * |
b7937dc4 | 644 | * Output: *a -> "mdev0", *b -> "ch6", *c -> "cdev" *d -> "my_channel" |
57562a72 | 645 | * |
b7937dc4 CG |
646 | * Input: "mdev1:ep81:cdev\n" |
647 | * Output: *a -> "mdev1", *b -> "ep81", *c -> "cdev" *d -> "" | |
57562a72 | 648 | * |
5d7df3ae | 649 | * Input: "mdev1:ep81" |
b7937dc4 | 650 | * Output: *a -> "mdev1", *b -> "ep81", *c -> "cdev" *d == NULL |
57562a72 | 651 | */ |
bdafb7e8 | 652 | static int split_string(char *buf, char **a, char **b, char **c, char **d) |
57562a72 CG |
653 | { |
654 | *a = strsep(&buf, ":"); | |
655 | if (!*a) | |
656 | return -EIO; | |
657 | ||
658 | *b = strsep(&buf, ":\n"); | |
659 | if (!*b) | |
660 | return -EIO; | |
661 | ||
bdafb7e8 CG |
662 | *c = strsep(&buf, ":\n"); |
663 | if (!*c) | |
664 | return -EIO; | |
665 | ||
666 | if (d) | |
667 | *d = strsep(&buf, ":\n"); | |
57562a72 CG |
668 | |
669 | return 0; | |
670 | } | |
671 | ||
9136fccf CG |
672 | static int match_bus_dev(struct device *dev, void *data) |
673 | { | |
674 | char *mdev_name = data; | |
675 | ||
676 | return !strcmp(dev_name(dev), mdev_name); | |
677 | } | |
678 | ||
57562a72 | 679 | /** |
b7937dc4 CG |
680 | * get_channel - get pointer to channel |
681 | * @mdev: name of the device interface | |
682 | * @mdev_ch: name of channel | |
57562a72 | 683 | */ |
ec0c2f62 | 684 | static struct most_channel *get_channel(char *mdev, char *mdev_ch) |
57562a72 | 685 | { |
9136fccf CG |
686 | struct device *dev = NULL; |
687 | struct most_interface *iface; | |
fcb7fad8 | 688 | struct most_channel *c, *tmp; |
57562a72 | 689 | |
9136fccf CG |
690 | dev = bus_find_device(&mc.bus, NULL, mdev, match_bus_dev); |
691 | if (!dev) | |
692 | return NULL; | |
693 | iface = to_most_interface(dev); | |
694 | list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) { | |
695 | if (!strcmp(dev_name(&c->dev), mdev_ch)) | |
696 | return c; | |
57562a72 | 697 | } |
9136fccf | 698 | return NULL; |
57562a72 CG |
699 | } |
700 | ||
fcb7fad8 | 701 | static |
db09fe0d CG |
702 | inline int link_channel_to_component(struct most_channel *c, |
703 | struct core_component *comp, | |
704 | char *comp_param) | |
e6e79b44 CG |
705 | { |
706 | int ret; | |
5a5abf02 | 707 | struct core_component **comp_ptr; |
e6e79b44 | 708 | |
5a5abf02 CG |
709 | if (!c->pipe0.comp) |
710 | comp_ptr = &c->pipe0.comp; | |
711 | else if (!c->pipe1.comp) | |
712 | comp_ptr = &c->pipe1.comp; | |
e6e79b44 CG |
713 | else |
714 | return -ENOSPC; | |
715 | ||
5a5abf02 | 716 | *comp_ptr = comp; |
7e0d3542 | 717 | ret = comp->probe_channel(c->iface, c->channel_id, &c->cfg, comp_param); |
e6e79b44 | 718 | if (ret) { |
5a5abf02 | 719 | *comp_ptr = NULL; |
e6e79b44 CG |
720 | return ret; |
721 | } | |
e6e79b44 CG |
722 | return 0; |
723 | } | |
724 | ||
57562a72 | 725 | /** |
b7937dc4 CG |
726 | * add_link_store - store function for add_link attribute |
727 | * @drv: device driver | |
57562a72 CG |
728 | * @buf: buffer |
729 | * @len: buffer length | |
730 | * | |
731 | * This parses the string given by buf and splits it into | |
b7937dc4 CG |
732 | * four substrings. Note: last substring is optional. In case a cdev |
733 | * component is loaded the optional 4th substring will make up the name of | |
57562a72 CG |
734 | * device node in the /dev directory. If omitted, the device node will |
735 | * inherit the channel's name within sysfs. | |
736 | * | |
b7937dc4 | 737 | * Searches for (device, channel) pair and probes the component |
57562a72 CG |
738 | * |
739 | * Example: | |
b7937dc4 CG |
740 | * (1) echo "mdev0:ch6:cdev:my_rxchannel" >add_link |
741 | * (2) echo "mdev1:ep81:cdev" >add_link | |
57562a72 CG |
742 | * |
743 | * (1) would create the device node /dev/my_rxchannel | |
5d7df3ae | 744 | * (2) would create the device node /dev/mdev1-ep81 |
57562a72 | 745 | */ |
bdafb7e8 | 746 | static ssize_t add_link_store(struct device_driver *drv, |
57562a72 CG |
747 | const char *buf, |
748 | size_t len) | |
749 | { | |
fcb7fad8 | 750 | struct most_channel *c; |
5a5abf02 | 751 | struct core_component *comp; |
57562a72 CG |
752 | char buffer[STRING_SIZE]; |
753 | char *mdev; | |
754 | char *mdev_ch; | |
5a5abf02 CG |
755 | char *comp_name; |
756 | char *comp_param; | |
57562a72 CG |
757 | char devnod_buf[STRING_SIZE]; |
758 | int ret; | |
3f78f611 | 759 | size_t max_len = min_t(size_t, len + 1, STRING_SIZE); |
57562a72 CG |
760 | |
761 | strlcpy(buffer, buf, max_len); | |
5a5abf02 | 762 | ret = split_string(buffer, &mdev, &mdev_ch, &comp_name, &comp_param); |
57562a72 CG |
763 | if (ret) |
764 | return ret; | |
fdbdc0e6 | 765 | comp = match_component(comp_name); |
3ba5515b CG |
766 | if (!comp) |
767 | return -ENODEV; | |
5a5abf02 | 768 | if (!comp_param || *comp_param == 0) { |
1446ff09 CG |
769 | snprintf(devnod_buf, sizeof(devnod_buf), "%s-%s", mdev, |
770 | mdev_ch); | |
5a5abf02 | 771 | comp_param = devnod_buf; |
57562a72 CG |
772 | } |
773 | ||
ec0c2f62 | 774 | c = get_channel(mdev, mdev_ch); |
9136fccf | 775 | if (!c) |
57562a72 CG |
776 | return -ENODEV; |
777 | ||
db09fe0d | 778 | ret = link_channel_to_component(c, comp, comp_param); |
e6e79b44 | 779 | if (ret) |
57562a72 | 780 | return ret; |
57562a72 CG |
781 | return len; |
782 | } | |
783 | ||
57562a72 | 784 | /** |
bf676f4c | 785 | * remove_link_store - store function for remove_link attribute |
b7937dc4 | 786 | * @drv: device driver |
57562a72 CG |
787 | * @buf: buffer |
788 | * @len: buffer length | |
789 | * | |
790 | * Example: | |
eefb2a84 | 791 | * echo "mdev0:ep81" >remove_link |
57562a72 | 792 | */ |
bdafb7e8 | 793 | static ssize_t remove_link_store(struct device_driver *drv, |
57562a72 CG |
794 | const char *buf, |
795 | size_t len) | |
796 | { | |
fcb7fad8 | 797 | struct most_channel *c; |
5a5abf02 | 798 | struct core_component *comp; |
57562a72 CG |
799 | char buffer[STRING_SIZE]; |
800 | char *mdev; | |
801 | char *mdev_ch; | |
5a5abf02 | 802 | char *comp_name; |
57562a72 | 803 | int ret; |
3f78f611 | 804 | size_t max_len = min_t(size_t, len + 1, STRING_SIZE); |
57562a72 CG |
805 | |
806 | strlcpy(buffer, buf, max_len); | |
5a5abf02 | 807 | ret = split_string(buffer, &mdev, &mdev_ch, &comp_name, NULL); |
57562a72 CG |
808 | if (ret) |
809 | return ret; | |
fdbdc0e6 | 810 | comp = match_component(comp_name); |
3ba5515b CG |
811 | if (!comp) |
812 | return -ENODEV; | |
ec0c2f62 | 813 | c = get_channel(mdev, mdev_ch); |
9136fccf | 814 | if (!c) |
57562a72 CG |
815 | return -ENODEV; |
816 | ||
5a5abf02 | 817 | if (comp->disconnect_channel(c->iface, c->channel_id)) |
44fe5781 | 818 | return -EIO; |
5a5abf02 CG |
819 | if (c->pipe0.comp == comp) |
820 | c->pipe0.comp = NULL; | |
821 | if (c->pipe1.comp == comp) | |
822 | c->pipe1.comp = NULL; | |
57562a72 CG |
823 | return len; |
824 | } | |
825 | ||
bdafb7e8 CG |
826 | #define DRV_ATTR(_name) (&driver_attr_##_name.attr) |
827 | ||
828 | static DRIVER_ATTR_RO(links); | |
fdbdc0e6 | 829 | static DRIVER_ATTR_RO(components); |
bdafb7e8 CG |
830 | static DRIVER_ATTR_WO(add_link); |
831 | static DRIVER_ATTR_WO(remove_link); | |
57562a72 | 832 | |
fdbdc0e6 | 833 | static struct attribute *mc_attrs[] = { |
bdafb7e8 | 834 | DRV_ATTR(links), |
fdbdc0e6 | 835 | DRV_ATTR(components), |
bdafb7e8 CG |
836 | DRV_ATTR(add_link), |
837 | DRV_ATTR(remove_link), | |
57562a72 CG |
838 | NULL, |
839 | }; | |
840 | ||
fdbdc0e6 CG |
841 | static struct attribute_group mc_attr_group = { |
842 | .attrs = mc_attrs, | |
57562a72 CG |
843 | }; |
844 | ||
fdbdc0e6 CG |
845 | static const struct attribute_group *mc_attr_groups[] = { |
846 | &mc_attr_group, | |
4d5f022f CG |
847 | NULL, |
848 | }; | |
57562a72 | 849 | |
845c31de | 850 | static int most_match(struct device *dev, struct device_driver *drv) |
921c80c5 CG |
851 | { |
852 | if (!strcmp(dev_name(dev), "most")) | |
853 | return 0; | |
854 | else | |
855 | return 1; | |
856 | } | |
857 | ||
57562a72 CG |
858 | static inline void trash_mbo(struct mbo *mbo) |
859 | { | |
860 | unsigned long flags; | |
fcb7fad8 | 861 | struct most_channel *c = mbo->context; |
57562a72 CG |
862 | |
863 | spin_lock_irqsave(&c->fifo_lock, flags); | |
864 | list_add(&mbo->list, &c->trash_fifo); | |
865 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
866 | } | |
867 | ||
fcb7fad8 | 868 | static bool hdm_mbo_ready(struct most_channel *c) |
57562a72 | 869 | { |
bf9503f1 | 870 | bool empty; |
57562a72 | 871 | |
bf9503f1 CG |
872 | if (c->enqueue_halt) |
873 | return false; | |
874 | ||
875 | spin_lock_irq(&c->fifo_lock); | |
876 | empty = list_empty(&c->halt_fifo); | |
877 | spin_unlock_irq(&c->fifo_lock); | |
878 | ||
879 | return !empty; | |
57562a72 CG |
880 | } |
881 | ||
882 | static void nq_hdm_mbo(struct mbo *mbo) | |
883 | { | |
884 | unsigned long flags; | |
fcb7fad8 | 885 | struct most_channel *c = mbo->context; |
57562a72 CG |
886 | |
887 | spin_lock_irqsave(&c->fifo_lock, flags); | |
888 | list_add_tail(&mbo->list, &c->halt_fifo); | |
889 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
890 | wake_up_interruptible(&c->hdm_fifo_wq); | |
891 | } | |
892 | ||
893 | static int hdm_enqueue_thread(void *data) | |
894 | { | |
fcb7fad8 | 895 | struct most_channel *c = data; |
57562a72 | 896 | struct mbo *mbo; |
bf9503f1 | 897 | int ret; |
57562a72 CG |
898 | typeof(c->iface->enqueue) enqueue = c->iface->enqueue; |
899 | ||
900 | while (likely(!kthread_should_stop())) { | |
901 | wait_event_interruptible(c->hdm_fifo_wq, | |
bf9503f1 | 902 | hdm_mbo_ready(c) || |
623d8002 | 903 | kthread_should_stop()); |
57562a72 | 904 | |
bf9503f1 CG |
905 | mutex_lock(&c->nq_mutex); |
906 | spin_lock_irq(&c->fifo_lock); | |
907 | if (unlikely(c->enqueue_halt || list_empty(&c->halt_fifo))) { | |
908 | spin_unlock_irq(&c->fifo_lock); | |
909 | mutex_unlock(&c->nq_mutex); | |
57562a72 | 910 | continue; |
bf9503f1 CG |
911 | } |
912 | ||
913 | mbo = list_pop_mbo(&c->halt_fifo); | |
914 | spin_unlock_irq(&c->fifo_lock); | |
57562a72 CG |
915 | |
916 | if (c->cfg.direction == MOST_CH_RX) | |
917 | mbo->buffer_length = c->cfg.buffer_size; | |
918 | ||
bf9503f1 CG |
919 | ret = enqueue(mbo->ifp, mbo->hdm_channel_id, mbo); |
920 | mutex_unlock(&c->nq_mutex); | |
921 | ||
922 | if (unlikely(ret)) { | |
57562a72 CG |
923 | pr_err("hdm enqueue failed\n"); |
924 | nq_hdm_mbo(mbo); | |
925 | c->hdm_enqueue_task = NULL; | |
926 | return 0; | |
927 | } | |
928 | } | |
929 | ||
930 | return 0; | |
931 | } | |
932 | ||
fcb7fad8 | 933 | static int run_enqueue_thread(struct most_channel *c, int channel_id) |
57562a72 CG |
934 | { |
935 | struct task_struct *task = | |
246ed517 SB |
936 | kthread_run(hdm_enqueue_thread, c, "hdm_fifo_%d", |
937 | channel_id); | |
57562a72 CG |
938 | |
939 | if (IS_ERR(task)) | |
940 | return PTR_ERR(task); | |
941 | ||
942 | c->hdm_enqueue_task = task; | |
943 | return 0; | |
944 | } | |
945 | ||
946 | /** | |
947 | * arm_mbo - recycle MBO for further usage | |
b7937dc4 | 948 | * @mbo: most buffer |
57562a72 CG |
949 | * |
950 | * This puts an MBO back to the list to have it ready for up coming | |
951 | * tx transactions. | |
952 | * | |
953 | * In case the MBO belongs to a channel that recently has been | |
954 | * poisoned, the MBO is scheduled to be trashed. | |
b7937dc4 | 955 | * Calls the completion handler of an attached component. |
57562a72 CG |
956 | */ |
957 | static void arm_mbo(struct mbo *mbo) | |
958 | { | |
959 | unsigned long flags; | |
fcb7fad8 | 960 | struct most_channel *c; |
57562a72 | 961 | |
57562a72 CG |
962 | c = mbo->context; |
963 | ||
964 | if (c->is_poisoned) { | |
965 | trash_mbo(mbo); | |
966 | return; | |
967 | } | |
968 | ||
969 | spin_lock_irqsave(&c->fifo_lock, flags); | |
71457d48 | 970 | ++*mbo->num_buffers_ptr; |
57562a72 CG |
971 | list_add_tail(&mbo->list, &c->fifo); |
972 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
973 | ||
5a5abf02 CG |
974 | if (c->pipe0.refs && c->pipe0.comp->tx_completion) |
975 | c->pipe0.comp->tx_completion(c->iface, c->channel_id); | |
f13f6981 | 976 | |
5a5abf02 CG |
977 | if (c->pipe1.refs && c->pipe1.comp->tx_completion) |
978 | c->pipe1.comp->tx_completion(c->iface, c->channel_id); | |
57562a72 CG |
979 | } |
980 | ||
981 | /** | |
982 | * arm_mbo_chain - helper function that arms an MBO chain for the HDM | |
983 | * @c: pointer to interface channel | |
984 | * @dir: direction of the channel | |
985 | * @compl: pointer to completion function | |
986 | * | |
987 | * This allocates buffer objects including the containing DMA coherent | |
988 | * buffer and puts them in the fifo. | |
989 | * Buffers of Rx channels are put in the kthread fifo, hence immediately | |
990 | * submitted to the HDM. | |
991 | * | |
992 | * Returns the number of allocated and enqueued MBOs. | |
993 | */ | |
fcb7fad8 | 994 | static int arm_mbo_chain(struct most_channel *c, int dir, |
c942ea7a | 995 | void (*compl)(struct mbo *)) |
57562a72 CG |
996 | { |
997 | unsigned int i; | |
57562a72 | 998 | struct mbo *mbo; |
aaf40322 | 999 | unsigned long flags; |
2ae07510 | 1000 | u32 coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len; |
57562a72 CG |
1001 | |
1002 | atomic_set(&c->mbo_nq_level, 0); | |
1003 | ||
1004 | for (i = 0; i < c->cfg.num_buffers; i++) { | |
1005 | mbo = kzalloc(sizeof(*mbo), GFP_KERNEL); | |
aaf40322 CG |
1006 | if (!mbo) |
1007 | goto flush_fifos; | |
1008 | ||
57562a72 CG |
1009 | mbo->context = c; |
1010 | mbo->ifp = c->iface; | |
1011 | mbo->hdm_channel_id = c->channel_id; | |
3598cec5 CG |
1012 | if (c->iface->dma_alloc) { |
1013 | mbo->virt_address = | |
1014 | c->iface->dma_alloc(mbo, coherent_buf_size); | |
1015 | } else { | |
1016 | mbo->virt_address = | |
1017 | kzalloc(coherent_buf_size, GFP_KERNEL); | |
1018 | } | |
aaf40322 CG |
1019 | if (!mbo->virt_address) |
1020 | goto release_mbo; | |
1021 | ||
57562a72 | 1022 | mbo->complete = compl; |
71457d48 | 1023 | mbo->num_buffers_ptr = &dummy_num_buffers; |
57562a72 CG |
1024 | if (dir == MOST_CH_RX) { |
1025 | nq_hdm_mbo(mbo); | |
1026 | atomic_inc(&c->mbo_nq_level); | |
1027 | } else { | |
aaf40322 CG |
1028 | spin_lock_irqsave(&c->fifo_lock, flags); |
1029 | list_add_tail(&mbo->list, &c->fifo); | |
1030 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
57562a72 CG |
1031 | } |
1032 | } | |
aaf40322 | 1033 | return c->cfg.num_buffers; |
57562a72 | 1034 | |
aaf40322 | 1035 | release_mbo: |
57562a72 | 1036 | kfree(mbo); |
aaf40322 CG |
1037 | |
1038 | flush_fifos: | |
1039 | flush_channel_fifos(c); | |
1040 | return 0; | |
57562a72 CG |
1041 | } |
1042 | ||
1043 | /** | |
1044 | * most_submit_mbo - submits an MBO to fifo | |
b7937dc4 | 1045 | * @mbo: most buffer |
57562a72 | 1046 | */ |
a6f9d846 | 1047 | void most_submit_mbo(struct mbo *mbo) |
57562a72 | 1048 | { |
a6f9d846 CG |
1049 | if (WARN_ONCE(!mbo || !mbo->context, |
1050 | "bad mbo or missing channel reference\n")) | |
1051 | return; | |
57562a72 CG |
1052 | |
1053 | nq_hdm_mbo(mbo); | |
57562a72 CG |
1054 | } |
1055 | EXPORT_SYMBOL_GPL(most_submit_mbo); | |
1056 | ||
1057 | /** | |
1058 | * most_write_completion - write completion handler | |
b7937dc4 | 1059 | * @mbo: most buffer |
57562a72 CG |
1060 | * |
1061 | * This recycles the MBO for further usage. In case the channel has been | |
1062 | * poisoned, the MBO is scheduled to be trashed. | |
1063 | */ | |
1064 | static void most_write_completion(struct mbo *mbo) | |
1065 | { | |
fcb7fad8 | 1066 | struct most_channel *c; |
57562a72 | 1067 | |
57562a72 CG |
1068 | c = mbo->context; |
1069 | if (mbo->status == MBO_E_INVAL) | |
1070 | pr_info("WARN: Tx MBO status: invalid\n"); | |
ec58d2a8 | 1071 | if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) |
57562a72 CG |
1072 | trash_mbo(mbo); |
1073 | else | |
1074 | arm_mbo(mbo); | |
1075 | } | |
1076 | ||
5a5abf02 CG |
1077 | int channel_has_mbo(struct most_interface *iface, int id, |
1078 | struct core_component *comp) | |
aac997df | 1079 | { |
9136fccf | 1080 | struct most_channel *c = iface->p->channel[id]; |
aac997df CG |
1081 | unsigned long flags; |
1082 | int empty; | |
1083 | ||
1084 | if (unlikely(!c)) | |
1085 | return -EINVAL; | |
1086 | ||
f898f989 | 1087 | if (c->pipe0.refs && c->pipe1.refs && |
5a5abf02 CG |
1088 | ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) || |
1089 | (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0))) | |
cdc293d5 CG |
1090 | return 0; |
1091 | ||
aac997df CG |
1092 | spin_lock_irqsave(&c->fifo_lock, flags); |
1093 | empty = list_empty(&c->fifo); | |
1094 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1095 | return !empty; | |
1096 | } | |
1097 | EXPORT_SYMBOL_GPL(channel_has_mbo); | |
1098 | ||
57562a72 CG |
1099 | /** |
1100 | * most_get_mbo - get pointer to an MBO of pool | |
1101 | * @iface: pointer to interface instance | |
1102 | * @id: channel ID | |
b7937dc4 | 1103 | * @comp: driver component |
57562a72 CG |
1104 | * |
1105 | * This attempts to get a free buffer out of the channel fifo. | |
1106 | * Returns a pointer to MBO on success or NULL otherwise. | |
1107 | */ | |
71457d48 | 1108 | struct mbo *most_get_mbo(struct most_interface *iface, int id, |
5a5abf02 | 1109 | struct core_component *comp) |
57562a72 CG |
1110 | { |
1111 | struct mbo *mbo; | |
fcb7fad8 | 1112 | struct most_channel *c; |
57562a72 | 1113 | unsigned long flags; |
71457d48 | 1114 | int *num_buffers_ptr; |
57562a72 | 1115 | |
9136fccf | 1116 | c = iface->p->channel[id]; |
57562a72 CG |
1117 | if (unlikely(!c)) |
1118 | return NULL; | |
71457d48 | 1119 | |
f898f989 | 1120 | if (c->pipe0.refs && c->pipe1.refs && |
5a5abf02 CG |
1121 | ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) || |
1122 | (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0))) | |
71457d48 CG |
1123 | return NULL; |
1124 | ||
5a5abf02 | 1125 | if (comp == c->pipe0.comp) |
f898f989 | 1126 | num_buffers_ptr = &c->pipe0.num_buffers; |
5a5abf02 | 1127 | else if (comp == c->pipe1.comp) |
f898f989 | 1128 | num_buffers_ptr = &c->pipe1.num_buffers; |
71457d48 CG |
1129 | else |
1130 | num_buffers_ptr = &dummy_num_buffers; | |
1131 | ||
57562a72 CG |
1132 | spin_lock_irqsave(&c->fifo_lock, flags); |
1133 | if (list_empty(&c->fifo)) { | |
1134 | spin_unlock_irqrestore(&c->fifo_lock, flags); | |
1135 | return NULL; | |
1136 | } | |
1137 | mbo = list_pop_mbo(&c->fifo); | |
71457d48 | 1138 | --*num_buffers_ptr; |
57562a72 | 1139 | spin_unlock_irqrestore(&c->fifo_lock, flags); |
71457d48 CG |
1140 | |
1141 | mbo->num_buffers_ptr = num_buffers_ptr; | |
57562a72 CG |
1142 | mbo->buffer_length = c->cfg.buffer_size; |
1143 | return mbo; | |
1144 | } | |
1145 | EXPORT_SYMBOL_GPL(most_get_mbo); | |
1146 | ||
57562a72 CG |
1147 | /** |
1148 | * most_put_mbo - return buffer to pool | |
b7937dc4 | 1149 | * @mbo: most buffer |
57562a72 CG |
1150 | */ |
1151 | void most_put_mbo(struct mbo *mbo) | |
1152 | { | |
fcb7fad8 | 1153 | struct most_channel *c = mbo->context; |
57562a72 | 1154 | |
57562a72 CG |
1155 | if (c->cfg.direction == MOST_CH_TX) { |
1156 | arm_mbo(mbo); | |
1157 | return; | |
1158 | } | |
1159 | nq_hdm_mbo(mbo); | |
1160 | atomic_inc(&c->mbo_nq_level); | |
1161 | } | |
1162 | EXPORT_SYMBOL_GPL(most_put_mbo); | |
1163 | ||
1164 | /** | |
1165 | * most_read_completion - read completion handler | |
b7937dc4 | 1166 | * @mbo: most buffer |
57562a72 CG |
1167 | * |
1168 | * This function is called by the HDM when data has been received from the | |
1169 | * hardware and copied to the buffer of the MBO. | |
1170 | * | |
1171 | * In case the channel has been poisoned it puts the buffer in the trash queue. | |
b7937dc4 | 1172 | * Otherwise, it passes the buffer to an component for further processing. |
57562a72 CG |
1173 | */ |
1174 | static void most_read_completion(struct mbo *mbo) | |
1175 | { | |
fcb7fad8 | 1176 | struct most_channel *c = mbo->context; |
57562a72 | 1177 | |
f13f6981 CG |
1178 | if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) { |
1179 | trash_mbo(mbo); | |
1180 | return; | |
1181 | } | |
57562a72 CG |
1182 | |
1183 | if (mbo->status == MBO_E_INVAL) { | |
1184 | nq_hdm_mbo(mbo); | |
1185 | atomic_inc(&c->mbo_nq_level); | |
1186 | return; | |
1187 | } | |
1188 | ||
5a63e23a | 1189 | if (atomic_sub_and_test(1, &c->mbo_nq_level)) |
57562a72 | 1190 | c->is_starving = 1; |
57562a72 | 1191 | |
5a5abf02 CG |
1192 | if (c->pipe0.refs && c->pipe0.comp->rx_completion && |
1193 | c->pipe0.comp->rx_completion(mbo) == 0) | |
57562a72 | 1194 | return; |
f13f6981 | 1195 | |
5a5abf02 CG |
1196 | if (c->pipe1.refs && c->pipe1.comp->rx_completion && |
1197 | c->pipe1.comp->rx_completion(mbo) == 0) | |
57562a72 | 1198 | return; |
f13f6981 CG |
1199 | |
1200 | most_put_mbo(mbo); | |
57562a72 CG |
1201 | } |
1202 | ||
1203 | /** | |
1204 | * most_start_channel - prepares a channel for communication | |
1205 | * @iface: pointer to interface instance | |
1206 | * @id: channel ID | |
b7937dc4 | 1207 | * @comp: driver component |
57562a72 CG |
1208 | * |
1209 | * This prepares the channel for usage. Cross-checks whether the | |
1210 | * channel's been properly configured. | |
1211 | * | |
1212 | * Returns 0 on success or error code otherwise. | |
1213 | */ | |
f13f6981 | 1214 | int most_start_channel(struct most_interface *iface, int id, |
5a5abf02 | 1215 | struct core_component *comp) |
57562a72 CG |
1216 | { |
1217 | int num_buffer; | |
1218 | int ret; | |
9136fccf | 1219 | struct most_channel *c = iface->p->channel[id]; |
57562a72 CG |
1220 | |
1221 | if (unlikely(!c)) | |
1222 | return -EINVAL; | |
1223 | ||
f13f6981 | 1224 | mutex_lock(&c->start_mutex); |
f898f989 | 1225 | if (c->pipe0.refs + c->pipe1.refs > 0) |
b7937dc4 | 1226 | goto out; /* already started by another component */ |
57562a72 CG |
1227 | |
1228 | if (!try_module_get(iface->mod)) { | |
1229 | pr_info("failed to acquire HDM lock\n"); | |
f13f6981 | 1230 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1231 | return -ENOLCK; |
1232 | } | |
57562a72 CG |
1233 | |
1234 | c->cfg.extra_len = 0; | |
1235 | if (c->iface->configure(c->iface, c->channel_id, &c->cfg)) { | |
1236 | pr_info("channel configuration failed. Go check settings...\n"); | |
1237 | ret = -EINVAL; | |
bddd3c25 | 1238 | goto err_put_module; |
57562a72 CG |
1239 | } |
1240 | ||
1241 | init_waitqueue_head(&c->hdm_fifo_wq); | |
1242 | ||
1243 | if (c->cfg.direction == MOST_CH_RX) | |
1244 | num_buffer = arm_mbo_chain(c, c->cfg.direction, | |
1245 | most_read_completion); | |
1246 | else | |
1247 | num_buffer = arm_mbo_chain(c, c->cfg.direction, | |
1248 | most_write_completion); | |
47af41b0 | 1249 | if (unlikely(!num_buffer)) { |
57562a72 | 1250 | ret = -ENOMEM; |
bddd3c25 | 1251 | goto err_put_module; |
57562a72 CG |
1252 | } |
1253 | ||
1254 | ret = run_enqueue_thread(c, id); | |
1255 | if (ret) | |
bddd3c25 | 1256 | goto err_put_module; |
57562a72 | 1257 | |
57562a72 | 1258 | c->is_starving = 0; |
f898f989 CG |
1259 | c->pipe0.num_buffers = c->cfg.num_buffers / 2; |
1260 | c->pipe1.num_buffers = c->cfg.num_buffers - c->pipe0.num_buffers; | |
57562a72 | 1261 | atomic_set(&c->mbo_ref, num_buffer); |
f13f6981 CG |
1262 | |
1263 | out: | |
5a5abf02 | 1264 | if (comp == c->pipe0.comp) |
f898f989 | 1265 | c->pipe0.refs++; |
5a5abf02 | 1266 | if (comp == c->pipe1.comp) |
f898f989 | 1267 | c->pipe1.refs++; |
f13f6981 | 1268 | mutex_unlock(&c->start_mutex); |
57562a72 | 1269 | return 0; |
f13f6981 | 1270 | |
bddd3c25 | 1271 | err_put_module: |
e23afff9 | 1272 | module_put(iface->mod); |
f13f6981 | 1273 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1274 | return ret; |
1275 | } | |
1276 | EXPORT_SYMBOL_GPL(most_start_channel); | |
1277 | ||
1278 | /** | |
1279 | * most_stop_channel - stops a running channel | |
1280 | * @iface: pointer to interface instance | |
1281 | * @id: channel ID | |
b7937dc4 | 1282 | * @comp: driver component |
57562a72 | 1283 | */ |
f13f6981 | 1284 | int most_stop_channel(struct most_interface *iface, int id, |
5a5abf02 | 1285 | struct core_component *comp) |
57562a72 | 1286 | { |
fcb7fad8 | 1287 | struct most_channel *c; |
57562a72 CG |
1288 | |
1289 | if (unlikely((!iface) || (id >= iface->num_channels) || (id < 0))) { | |
1290 | pr_err("Bad interface or index out of range\n"); | |
1291 | return -EINVAL; | |
1292 | } | |
9136fccf | 1293 | c = iface->p->channel[id]; |
57562a72 CG |
1294 | if (unlikely(!c)) |
1295 | return -EINVAL; | |
1296 | ||
f13f6981 | 1297 | mutex_lock(&c->start_mutex); |
f898f989 | 1298 | if (c->pipe0.refs + c->pipe1.refs >= 2) |
f13f6981 | 1299 | goto out; |
57562a72 | 1300 | |
57562a72 CG |
1301 | if (c->hdm_enqueue_task) |
1302 | kthread_stop(c->hdm_enqueue_task); | |
1303 | c->hdm_enqueue_task = NULL; | |
57562a72 | 1304 | |
9cda3007 | 1305 | if (iface->mod) |
57562a72 | 1306 | module_put(iface->mod); |
57562a72 CG |
1307 | |
1308 | c->is_poisoned = true; | |
1309 | if (c->iface->poison_channel(c->iface, c->channel_id)) { | |
1310 | pr_err("Cannot stop channel %d of mdev %s\n", c->channel_id, | |
1311 | c->iface->description); | |
f13f6981 | 1312 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1313 | return -EAGAIN; |
1314 | } | |
1315 | flush_trash_fifo(c); | |
1316 | flush_channel_fifos(c); | |
1317 | ||
1318 | #ifdef CMPL_INTERRUPTIBLE | |
1319 | if (wait_for_completion_interruptible(&c->cleanup)) { | |
1320 | pr_info("Interrupted while clean up ch %d\n", c->channel_id); | |
f13f6981 | 1321 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1322 | return -EINTR; |
1323 | } | |
1324 | #else | |
1325 | wait_for_completion(&c->cleanup); | |
1326 | #endif | |
1327 | c->is_poisoned = false; | |
f13f6981 CG |
1328 | |
1329 | out: | |
5a5abf02 | 1330 | if (comp == c->pipe0.comp) |
f898f989 | 1331 | c->pipe0.refs--; |
5a5abf02 | 1332 | if (comp == c->pipe1.comp) |
f898f989 | 1333 | c->pipe1.refs--; |
f13f6981 | 1334 | mutex_unlock(&c->start_mutex); |
57562a72 CG |
1335 | return 0; |
1336 | } | |
1337 | EXPORT_SYMBOL_GPL(most_stop_channel); | |
1338 | ||
1339 | /** | |
b7937dc4 CG |
1340 | * most_register_component - registers a driver component with the core |
1341 | * @comp: driver component | |
57562a72 | 1342 | */ |
5a5abf02 | 1343 | int most_register_component(struct core_component *comp) |
57562a72 | 1344 | { |
5a5abf02 | 1345 | if (!comp) { |
b7937dc4 | 1346 | pr_err("Bad component\n"); |
57562a72 CG |
1347 | return -EINVAL; |
1348 | } | |
5a5abf02 | 1349 | list_add_tail(&comp->list, &mc.comp_list); |
b7937dc4 | 1350 | pr_info("registered new core component %s\n", comp->name); |
57562a72 CG |
1351 | return 0; |
1352 | } | |
ed021a0f | 1353 | EXPORT_SYMBOL_GPL(most_register_component); |
57562a72 | 1354 | |
9136fccf CG |
1355 | static int disconnect_channels(struct device *dev, void *data) |
1356 | { | |
1357 | struct most_interface *iface; | |
1358 | struct most_channel *c, *tmp; | |
5a5abf02 | 1359 | struct core_component *comp = data; |
9136fccf CG |
1360 | |
1361 | iface = to_most_interface(dev); | |
1362 | list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) { | |
5a5abf02 CG |
1363 | if (c->pipe0.comp == comp || c->pipe1.comp == comp) |
1364 | comp->disconnect_channel(c->iface, c->channel_id); | |
1365 | if (c->pipe0.comp == comp) | |
1366 | c->pipe0.comp = NULL; | |
1367 | if (c->pipe1.comp == comp) | |
1368 | c->pipe1.comp = NULL; | |
9136fccf CG |
1369 | } |
1370 | return 0; | |
1371 | } | |
1372 | ||
57562a72 | 1373 | /** |
b7937dc4 CG |
1374 | * most_deregister_component - deregisters a driver component with the core |
1375 | * @comp: driver component | |
57562a72 | 1376 | */ |
5a5abf02 | 1377 | int most_deregister_component(struct core_component *comp) |
57562a72 | 1378 | { |
5a5abf02 | 1379 | if (!comp) { |
b7937dc4 | 1380 | pr_err("Bad component\n"); |
57562a72 CG |
1381 | return -EINVAL; |
1382 | } | |
1383 | ||
5a5abf02 CG |
1384 | bus_for_each_dev(&mc.bus, NULL, comp, disconnect_channels); |
1385 | list_del(&comp->list); | |
b7937dc4 | 1386 | pr_info("deregistering component %s\n", comp->name); |
57562a72 CG |
1387 | return 0; |
1388 | } | |
ed021a0f | 1389 | EXPORT_SYMBOL_GPL(most_deregister_component); |
57562a72 | 1390 | |
4d5f022f CG |
1391 | static void release_interface(struct device *dev) |
1392 | { | |
1393 | pr_info("releasing interface dev %s...\n", dev_name(dev)); | |
1394 | } | |
1395 | ||
1396 | static void release_channel(struct device *dev) | |
1397 | { | |
1398 | pr_info("releasing channel dev %s...\n", dev_name(dev)); | |
1399 | } | |
1400 | ||
57562a72 CG |
1401 | /** |
1402 | * most_register_interface - registers an interface with core | |
b7937dc4 | 1403 | * @iface: device interface |
57562a72 CG |
1404 | * |
1405 | * Allocates and initializes a new interface instance and all of its channels. | |
1406 | * Returns a pointer to kobject or an error pointer. | |
1407 | */ | |
4d5f022f | 1408 | int most_register_interface(struct most_interface *iface) |
57562a72 CG |
1409 | { |
1410 | unsigned int i; | |
1411 | int id; | |
fcb7fad8 | 1412 | struct most_channel *c; |
57562a72 CG |
1413 | |
1414 | if (!iface || !iface->enqueue || !iface->configure || | |
1415 | !iface->poison_channel || (iface->num_channels > MAX_CHANNELS)) { | |
1416 | pr_err("Bad interface or channel overflow\n"); | |
4d5f022f | 1417 | return -EINVAL; |
57562a72 CG |
1418 | } |
1419 | ||
1420 | id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL); | |
1421 | if (id < 0) { | |
1422 | pr_info("Failed to alloc mdev ID\n"); | |
4d5f022f | 1423 | return id; |
57562a72 | 1424 | } |
57562a72 | 1425 | |
9136fccf CG |
1426 | iface->p = kzalloc(sizeof(*iface->p), GFP_KERNEL); |
1427 | if (!iface->p) { | |
b7382d44 | 1428 | ida_simple_remove(&mdev_id, id); |
4d5f022f | 1429 | return -ENOMEM; |
57562a72 CG |
1430 | } |
1431 | ||
9136fccf CG |
1432 | INIT_LIST_HEAD(&iface->p->channel_list); |
1433 | iface->p->dev_id = id; | |
1434 | snprintf(iface->p->name, STRING_SIZE, "mdev%d", id); | |
1435 | iface->dev.init_name = iface->p->name; | |
14ae5f03 CG |
1436 | iface->dev.bus = &mc.bus; |
1437 | iface->dev.parent = &mc.dev; | |
4d5f022f CG |
1438 | iface->dev.groups = interface_attr_groups; |
1439 | iface->dev.release = release_interface; | |
1440 | if (device_register(&iface->dev)) { | |
1441 | pr_err("registering iface->dev failed\n"); | |
9136fccf | 1442 | kfree(iface->p); |
4d5f022f CG |
1443 | ida_simple_remove(&mdev_id, id); |
1444 | return -ENOMEM; | |
1445 | } | |
57562a72 CG |
1446 | |
1447 | for (i = 0; i < iface->num_channels; i++) { | |
1448 | const char *name_suffix = iface->channel_vector[i].name_suffix; | |
1449 | ||
4d5f022f | 1450 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
57562a72 | 1451 | if (!c) |
bddd3c25 | 1452 | goto err_free_resources; |
845101be CG |
1453 | if (!name_suffix) |
1454 | snprintf(c->name, STRING_SIZE, "ch%d", i); | |
1455 | else | |
1456 | snprintf(c->name, STRING_SIZE, "%s", name_suffix); | |
1457 | c->dev.init_name = c->name; | |
4d5f022f CG |
1458 | c->dev.parent = &iface->dev; |
1459 | c->dev.groups = channel_attr_groups; | |
1460 | c->dev.release = release_channel; | |
9136fccf | 1461 | iface->p->channel[i] = c; |
57562a72 CG |
1462 | c->is_starving = 0; |
1463 | c->iface = iface; | |
57562a72 CG |
1464 | c->channel_id = i; |
1465 | c->keep_mbo = false; | |
1466 | c->enqueue_halt = false; | |
1467 | c->is_poisoned = false; | |
57562a72 CG |
1468 | c->cfg.direction = 0; |
1469 | c->cfg.data_type = 0; | |
1470 | c->cfg.num_buffers = 0; | |
1471 | c->cfg.buffer_size = 0; | |
1472 | c->cfg.subbuffer_size = 0; | |
1473 | c->cfg.packets_per_xact = 0; | |
1474 | spin_lock_init(&c->fifo_lock); | |
1475 | INIT_LIST_HEAD(&c->fifo); | |
1476 | INIT_LIST_HEAD(&c->trash_fifo); | |
1477 | INIT_LIST_HEAD(&c->halt_fifo); | |
1478 | init_completion(&c->cleanup); | |
1479 | atomic_set(&c->mbo_ref, 0); | |
f13f6981 | 1480 | mutex_init(&c->start_mutex); |
bf9503f1 | 1481 | mutex_init(&c->nq_mutex); |
9136fccf | 1482 | list_add_tail(&c->list, &iface->p->channel_list); |
f0b4a22a CG |
1483 | if (device_register(&c->dev)) { |
1484 | pr_err("registering c->dev failed\n"); | |
bddd3c25 | 1485 | goto err_free_most_channel; |
f0b4a22a | 1486 | } |
57562a72 | 1487 | } |
b7937dc4 | 1488 | pr_info("registered new device mdev%d (%s)\n", |
4d5f022f CG |
1489 | id, iface->description); |
1490 | return 0; | |
57562a72 | 1491 | |
bddd3c25 | 1492 | err_free_most_channel: |
9136fccf CG |
1493 | kfree(c); |
1494 | ||
bddd3c25 | 1495 | err_free_resources: |
9136fccf CG |
1496 | while (i > 0) { |
1497 | c = iface->p->channel[--i]; | |
1498 | device_unregister(&c->dev); | |
1499 | kfree(c); | |
1500 | } | |
1501 | kfree(iface->p); | |
4d5f022f | 1502 | device_unregister(&iface->dev); |
b7382d44 | 1503 | ida_simple_remove(&mdev_id, id); |
4d5f022f | 1504 | return -ENOMEM; |
57562a72 CG |
1505 | } |
1506 | EXPORT_SYMBOL_GPL(most_register_interface); | |
1507 | ||
1508 | /** | |
1509 | * most_deregister_interface - deregisters an interface with core | |
b7937dc4 | 1510 | * @iface: device interface |
57562a72 CG |
1511 | * |
1512 | * Before removing an interface instance from the list, all running | |
1513 | * channels are stopped and poisoned. | |
1514 | */ | |
1515 | void most_deregister_interface(struct most_interface *iface) | |
1516 | { | |
4d5f022f | 1517 | int i; |
fcb7fad8 | 1518 | struct most_channel *c; |
57562a72 | 1519 | |
92d01a56 QK |
1520 | pr_info("deregistering device %s (%s)\n", dev_name(&iface->dev), |
1521 | iface->description); | |
4d5f022f | 1522 | for (i = 0; i < iface->num_channels; i++) { |
9136fccf | 1523 | c = iface->p->channel[i]; |
5a5abf02 CG |
1524 | if (c->pipe0.comp) |
1525 | c->pipe0.comp->disconnect_channel(c->iface, | |
a0fceb1f | 1526 | c->channel_id); |
5a5abf02 CG |
1527 | if (c->pipe1.comp) |
1528 | c->pipe1.comp->disconnect_channel(c->iface, | |
a0fceb1f | 1529 | c->channel_id); |
5a5abf02 CG |
1530 | c->pipe0.comp = NULL; |
1531 | c->pipe1.comp = NULL; | |
4d5f022f CG |
1532 | list_del(&c->list); |
1533 | device_unregister(&c->dev); | |
1534 | kfree(c); | |
a0fceb1f CG |
1535 | } |
1536 | ||
9136fccf CG |
1537 | ida_simple_remove(&mdev_id, iface->p->dev_id); |
1538 | kfree(iface->p); | |
4d5f022f | 1539 | device_unregister(&iface->dev); |
57562a72 CG |
1540 | } |
1541 | EXPORT_SYMBOL_GPL(most_deregister_interface); | |
1542 | ||
1543 | /** | |
1544 | * most_stop_enqueue - prevents core from enqueueing MBOs | |
1545 | * @iface: pointer to interface | |
1546 | * @id: channel id | |
1547 | * | |
1548 | * This is called by an HDM that _cannot_ attend to its duties and | |
1549 | * is imminent to get run over by the core. The core is not going to | |
1550 | * enqueue any further packets unless the flagging HDM calls | |
1551 | * most_resume enqueue(). | |
1552 | */ | |
1553 | void most_stop_enqueue(struct most_interface *iface, int id) | |
1554 | { | |
9136fccf | 1555 | struct most_channel *c = iface->p->channel[id]; |
57562a72 | 1556 | |
bf9503f1 CG |
1557 | if (!c) |
1558 | return; | |
1559 | ||
1560 | mutex_lock(&c->nq_mutex); | |
1561 | c->enqueue_halt = true; | |
1562 | mutex_unlock(&c->nq_mutex); | |
57562a72 CG |
1563 | } |
1564 | EXPORT_SYMBOL_GPL(most_stop_enqueue); | |
1565 | ||
1566 | /** | |
1567 | * most_resume_enqueue - allow core to enqueue MBOs again | |
1568 | * @iface: pointer to interface | |
1569 | * @id: channel id | |
1570 | * | |
1571 | * This clears the enqueue halt flag and enqueues all MBOs currently | |
1572 | * sitting in the wait fifo. | |
1573 | */ | |
1574 | void most_resume_enqueue(struct most_interface *iface, int id) | |
1575 | { | |
9136fccf | 1576 | struct most_channel *c = iface->p->channel[id]; |
57562a72 | 1577 | |
bf9503f1 | 1578 | if (!c) |
57562a72 | 1579 | return; |
bf9503f1 CG |
1580 | |
1581 | mutex_lock(&c->nq_mutex); | |
57562a72 | 1582 | c->enqueue_halt = false; |
bf9503f1 | 1583 | mutex_unlock(&c->nq_mutex); |
57562a72 CG |
1584 | |
1585 | wake_up_interruptible(&c->hdm_fifo_wq); | |
1586 | } | |
1587 | EXPORT_SYMBOL_GPL(most_resume_enqueue); | |
1588 | ||
4d5f022f CG |
1589 | static void release_most_sub(struct device *dev) |
1590 | { | |
1591 | pr_info("releasing most_subsystem\n"); | |
1592 | } | |
1593 | ||
57562a72 CG |
1594 | static int __init most_init(void) |
1595 | { | |
cc4188b6 SM |
1596 | int err; |
1597 | ||
57562a72 | 1598 | pr_info("init()\n"); |
81ce26b7 | 1599 | INIT_LIST_HEAD(&mc.comp_list); |
57562a72 CG |
1600 | ida_init(&mdev_id); |
1601 | ||
14ae5f03 CG |
1602 | mc.bus.name = "most", |
1603 | mc.bus.match = most_match, | |
1604 | mc.drv.name = "most_core", | |
1605 | mc.drv.bus = &mc.bus, | |
fdbdc0e6 | 1606 | mc.drv.groups = mc_attr_groups; |
14ae5f03 CG |
1607 | |
1608 | err = bus_register(&mc.bus); | |
cc4188b6 | 1609 | if (err) { |
57562a72 | 1610 | pr_info("Cannot register most bus\n"); |
cc4188b6 | 1611 | return err; |
57562a72 | 1612 | } |
14ae5f03 | 1613 | err = driver_register(&mc.drv); |
cc4188b6 | 1614 | if (err) { |
57562a72 | 1615 | pr_info("Cannot register core driver\n"); |
bddd3c25 | 1616 | goto err_unregister_bus; |
57562a72 | 1617 | } |
14ae5f03 CG |
1618 | mc.dev.init_name = "most_bus"; |
1619 | mc.dev.release = release_most_sub; | |
1620 | if (device_register(&mc.dev)) { | |
cc4188b6 | 1621 | err = -ENOMEM; |
bddd3c25 | 1622 | goto err_unregister_driver; |
cc4188b6 | 1623 | } |
57562a72 CG |
1624 | |
1625 | return 0; | |
1626 | ||
bddd3c25 | 1627 | err_unregister_driver: |
14ae5f03 | 1628 | driver_unregister(&mc.drv); |
bddd3c25 | 1629 | err_unregister_bus: |
14ae5f03 | 1630 | bus_unregister(&mc.bus); |
cc4188b6 | 1631 | return err; |
57562a72 CG |
1632 | } |
1633 | ||
1634 | static void __exit most_exit(void) | |
1635 | { | |
57562a72 | 1636 | pr_info("exit core module\n"); |
14ae5f03 CG |
1637 | device_unregister(&mc.dev); |
1638 | driver_unregister(&mc.drv); | |
14ae5f03 | 1639 | bus_unregister(&mc.bus); |
57562a72 CG |
1640 | ida_destroy(&mdev_id); |
1641 | } | |
1642 | ||
1643 | module_init(most_init); | |
1644 | module_exit(most_exit); | |
1645 | MODULE_LICENSE("GPL"); | |
1646 | MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>"); | |
1647 | MODULE_DESCRIPTION("Core module of stacked MOST Linux driver"); |