This source file includes following definitions.
- mei_irq_compl_handler
- mei_cl_hbm_equal
- mei_irq_discard_msg
- mei_cl_irq_read_msg
- mei_cl_irq_disconnect_rsp
- mei_cl_irq_read
- hdr_is_hbm
- hdr_is_fixed
- hdr_is_valid
- mei_irq_read_handler
- mei_irq_write_handler
- mei_connect_timeout
- mei_schedule_stall_timer
- mei_timer
1
2
3
4
5
6
7 #include <linux/export.h>
8 #include <linux/kthread.h>
9 #include <linux/interrupt.h>
10 #include <linux/fs.h>
11 #include <linux/jiffies.h>
12 #include <linux/slab.h>
13 #include <linux/pm_runtime.h>
14
15 #include <linux/mei.h>
16
17 #include "mei_dev.h"
18 #include "hbm.h"
19 #include "client.h"
20
21
22
23
24
25
26
27
28
29 void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list)
30 {
31 struct mei_cl_cb *cb, *next;
32 struct mei_cl *cl;
33
34 list_for_each_entry_safe(cb, next, cmpl_list, list) {
35 cl = cb->cl;
36 list_del_init(&cb->list);
37
38 dev_dbg(dev->dev, "completing call back.\n");
39 mei_cl_complete(cl, cb);
40 }
41 }
42 EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
43
44
45
46
47
48
49
50
51
52 static inline int mei_cl_hbm_equal(struct mei_cl *cl,
53 struct mei_msg_hdr *mei_hdr)
54 {
55 return mei_cl_host_addr(cl) == mei_hdr->host_addr &&
56 mei_cl_me_id(cl) == mei_hdr->me_addr;
57 }
58
59
60
61
62
63
64
65 static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
66 {
67 if (hdr->dma_ring)
68 mei_dma_ring_read(dev, NULL, hdr->extension[0]);
69
70
71
72
73 mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
74 dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
75 MEI_HDR_PRM(hdr));
76 }
77
78
79
80
81
82
83
84
85
86
87 static int mei_cl_irq_read_msg(struct mei_cl *cl,
88 struct mei_msg_hdr *mei_hdr,
89 struct list_head *cmpl_list)
90 {
91 struct mei_device *dev = cl->dev;
92 struct mei_cl_cb *cb;
93 size_t buf_sz;
94 u32 length;
95
96 cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
97 if (!cb) {
98 if (!mei_cl_is_fixed_address(cl)) {
99 cl_err(dev, cl, "pending read cb not found\n");
100 goto discard;
101 }
102 cb = mei_cl_alloc_cb(cl, mei_cl_mtu(cl), MEI_FOP_READ, cl->fp);
103 if (!cb)
104 goto discard;
105 list_add_tail(&cb->list, &cl->rd_pending);
106 }
107
108 if (!mei_cl_is_connected(cl)) {
109 cl_dbg(dev, cl, "not connected\n");
110 cb->status = -ENODEV;
111 goto discard;
112 }
113
114 length = mei_hdr->dma_ring ? mei_hdr->extension[0] : mei_hdr->length;
115
116 buf_sz = length + cb->buf_idx;
117
118 if (buf_sz < cb->buf_idx) {
119 cl_err(dev, cl, "message is too big len %d idx %zu\n",
120 length, cb->buf_idx);
121 cb->status = -EMSGSIZE;
122 goto discard;
123 }
124
125 if (cb->buf.size < buf_sz) {
126 cl_dbg(dev, cl, "message overflow. size %zu len %d idx %zu\n",
127 cb->buf.size, length, cb->buf_idx);
128 cb->status = -EMSGSIZE;
129 goto discard;
130 }
131
132 if (mei_hdr->dma_ring)
133 mei_dma_ring_read(dev, cb->buf.data + cb->buf_idx, length);
134
135
136 mei_read_slots(dev, cb->buf.data + cb->buf_idx, mei_hdr->length);
137
138 cb->buf_idx += length;
139
140 if (mei_hdr->msg_complete) {
141 cl_dbg(dev, cl, "completed read length = %zu\n", cb->buf_idx);
142 list_move_tail(&cb->list, cmpl_list);
143 } else {
144 pm_runtime_mark_last_busy(dev->dev);
145 pm_request_autosuspend(dev->dev);
146 }
147
148 return 0;
149
150 discard:
151 if (cb)
152 list_move_tail(&cb->list, cmpl_list);
153 mei_irq_discard_msg(dev, mei_hdr);
154 return 0;
155 }
156
157
158
159
160
161
162
163
164
165
166 static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
167 struct list_head *cmpl_list)
168 {
169 struct mei_device *dev = cl->dev;
170 u32 msg_slots;
171 int slots;
172 int ret;
173
174 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_response));
175 slots = mei_hbuf_empty_slots(dev);
176 if (slots < 0)
177 return -EOVERFLOW;
178
179 if ((u32)slots < msg_slots)
180 return -EMSGSIZE;
181
182 ret = mei_hbm_cl_disconnect_rsp(dev, cl);
183 list_move_tail(&cb->list, cmpl_list);
184
185 return ret;
186 }
187
188
189
190
191
192
193
194
195
196
197
198 static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
199 struct list_head *cmpl_list)
200 {
201 struct mei_device *dev = cl->dev;
202 u32 msg_slots;
203 int slots;
204 int ret;
205
206 if (!list_empty(&cl->rd_pending))
207 return 0;
208
209 msg_slots = mei_hbm2slots(sizeof(struct hbm_flow_control));
210 slots = mei_hbuf_empty_slots(dev);
211 if (slots < 0)
212 return -EOVERFLOW;
213
214 if ((u32)slots < msg_slots)
215 return -EMSGSIZE;
216
217 ret = mei_hbm_cl_flow_control_req(dev, cl);
218 if (ret) {
219 cl->status = ret;
220 cb->buf_idx = 0;
221 list_move_tail(&cb->list, cmpl_list);
222 return ret;
223 }
224
225 list_move_tail(&cb->list, &cl->rd_pending);
226
227 return 0;
228 }
229
230 static inline bool hdr_is_hbm(struct mei_msg_hdr *mei_hdr)
231 {
232 return mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0;
233 }
234
235 static inline bool hdr_is_fixed(struct mei_msg_hdr *mei_hdr)
236 {
237 return mei_hdr->host_addr == 0 && mei_hdr->me_addr != 0;
238 }
239
240 static inline int hdr_is_valid(u32 msg_hdr)
241 {
242 struct mei_msg_hdr *mei_hdr;
243
244 mei_hdr = (struct mei_msg_hdr *)&msg_hdr;
245 if (!msg_hdr || mei_hdr->reserved)
246 return -EBADMSG;
247
248 if (mei_hdr->dma_ring && mei_hdr->length != MEI_SLOT_SIZE)
249 return -EBADMSG;
250
251 return 0;
252 }
253
254
255
256
257
258
259
260
261
262
263
264 int mei_irq_read_handler(struct mei_device *dev,
265 struct list_head *cmpl_list, s32 *slots)
266 {
267 struct mei_msg_hdr *mei_hdr;
268 struct mei_cl *cl;
269 int ret;
270
271 if (!dev->rd_msg_hdr[0]) {
272 dev->rd_msg_hdr[0] = mei_read_hdr(dev);
273 (*slots)--;
274 dev_dbg(dev->dev, "slots =%08x.\n", *slots);
275
276 ret = hdr_is_valid(dev->rd_msg_hdr[0]);
277 if (ret) {
278 dev_err(dev->dev, "corrupted message header 0x%08X\n",
279 dev->rd_msg_hdr[0]);
280 goto end;
281 }
282 }
283
284 mei_hdr = (struct mei_msg_hdr *)dev->rd_msg_hdr;
285 dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
286
287 if (mei_slots2data(*slots) < mei_hdr->length) {
288 dev_err(dev->dev, "less data available than length=%08x.\n",
289 *slots);
290
291 ret = -ENODATA;
292 goto end;
293 }
294
295 if (mei_hdr->dma_ring) {
296 dev->rd_msg_hdr[1] = mei_read_hdr(dev);
297 (*slots)--;
298 mei_hdr->length = 0;
299 }
300
301
302 if (hdr_is_hbm(mei_hdr)) {
303 ret = mei_hbm_dispatch(dev, mei_hdr);
304 if (ret) {
305 dev_dbg(dev->dev, "mei_hbm_dispatch failed ret = %d\n",
306 ret);
307 goto end;
308 }
309 goto reset_slots;
310 }
311
312
313 list_for_each_entry(cl, &dev->file_list, link) {
314 if (mei_cl_hbm_equal(cl, mei_hdr)) {
315 cl_dbg(dev, cl, "got a message\n");
316 break;
317 }
318 }
319
320
321 if (&cl->link == &dev->file_list) {
322
323
324
325
326
327 if (hdr_is_fixed(mei_hdr) ||
328 dev->dev_state == MEI_DEV_POWER_DOWN) {
329 mei_irq_discard_msg(dev, mei_hdr);
330 ret = 0;
331 goto reset_slots;
332 }
333 dev_err(dev->dev, "no destination client found 0x%08X\n",
334 dev->rd_msg_hdr[0]);
335 ret = -EBADMSG;
336 goto end;
337 }
338
339 ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
340
341
342 reset_slots:
343
344 memset(dev->rd_msg_hdr, 0, sizeof(dev->rd_msg_hdr));
345 *slots = mei_count_full_read_slots(dev);
346 if (*slots == -EOVERFLOW) {
347
348 dev_err(dev->dev, "resetting due to slots overflow.\n");
349
350 ret = -ERANGE;
351 goto end;
352 }
353 end:
354 return ret;
355 }
356 EXPORT_SYMBOL_GPL(mei_irq_read_handler);
357
358
359
360
361
362
363
364
365
366
367
368 int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list)
369 {
370
371 struct mei_cl *cl;
372 struct mei_cl_cb *cb, *next;
373 s32 slots;
374 int ret;
375
376
377 if (!mei_hbuf_acquire(dev))
378 return 0;
379
380 slots = mei_hbuf_empty_slots(dev);
381 if (slots < 0)
382 return -EOVERFLOW;
383
384 if (slots == 0)
385 return -EMSGSIZE;
386
387
388 dev_dbg(dev->dev, "complete all waiting for write cb.\n");
389
390 list_for_each_entry_safe(cb, next, &dev->write_waiting_list, list) {
391 cl = cb->cl;
392
393 cl->status = 0;
394 cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
395 cl->writing_state = MEI_WRITE_COMPLETE;
396 list_move_tail(&cb->list, cmpl_list);
397 }
398
399
400 dev_dbg(dev->dev, "complete control write list cb.\n");
401 list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list, list) {
402 cl = cb->cl;
403 switch (cb->fop_type) {
404 case MEI_FOP_DISCONNECT:
405
406 ret = mei_cl_irq_disconnect(cl, cb, cmpl_list);
407 if (ret)
408 return ret;
409
410 break;
411 case MEI_FOP_READ:
412
413 ret = mei_cl_irq_read(cl, cb, cmpl_list);
414 if (ret)
415 return ret;
416
417 break;
418 case MEI_FOP_CONNECT:
419
420 ret = mei_cl_irq_connect(cl, cb, cmpl_list);
421 if (ret)
422 return ret;
423
424 break;
425 case MEI_FOP_DISCONNECT_RSP:
426
427 ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
428 if (ret)
429 return ret;
430 break;
431
432 case MEI_FOP_NOTIFY_START:
433 case MEI_FOP_NOTIFY_STOP:
434 ret = mei_cl_irq_notify(cl, cb, cmpl_list);
435 if (ret)
436 return ret;
437 break;
438 default:
439 BUG();
440 }
441
442 }
443
444 dev_dbg(dev->dev, "complete write list cb.\n");
445 list_for_each_entry_safe(cb, next, &dev->write_list, list) {
446 cl = cb->cl;
447 ret = mei_cl_irq_write(cl, cb, cmpl_list);
448 if (ret)
449 return ret;
450 }
451 return 0;
452 }
453 EXPORT_SYMBOL_GPL(mei_irq_write_handler);
454
455
456
457
458
459
460
461 static void mei_connect_timeout(struct mei_cl *cl)
462 {
463 struct mei_device *dev = cl->dev;
464
465 if (cl->state == MEI_FILE_CONNECTING) {
466 if (dev->hbm_f_dot_supported) {
467 cl->state = MEI_FILE_DISCONNECT_REQUIRED;
468 wake_up(&cl->wait);
469 return;
470 }
471 }
472 mei_reset(dev);
473 }
474
475 #define MEI_STALL_TIMER_FREQ (2 * HZ)
476
477
478
479
480
481
482
483 void mei_schedule_stall_timer(struct mei_device *dev)
484 {
485 schedule_delayed_work(&dev->timer_work, MEI_STALL_TIMER_FREQ);
486 }
487
488
489
490
491
492
493
494 void mei_timer(struct work_struct *work)
495 {
496 struct mei_cl *cl;
497 struct mei_device *dev = container_of(work,
498 struct mei_device, timer_work.work);
499 bool reschedule_timer = false;
500
501 mutex_lock(&dev->device_lock);
502
503
504 if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
505 dev->hbm_state != MEI_HBM_IDLE) {
506
507 if (dev->init_clients_timer) {
508 if (--dev->init_clients_timer == 0) {
509 dev_err(dev->dev, "timer: init clients timeout hbm_state = %d.\n",
510 dev->hbm_state);
511 mei_reset(dev);
512 goto out;
513 }
514 reschedule_timer = true;
515 }
516 }
517
518 if (dev->dev_state != MEI_DEV_ENABLED)
519 goto out;
520
521
522 list_for_each_entry(cl, &dev->file_list, link) {
523 if (cl->timer_count) {
524 if (--cl->timer_count == 0) {
525 dev_err(dev->dev, "timer: connect/disconnect timeout.\n");
526 mei_connect_timeout(cl);
527 goto out;
528 }
529 reschedule_timer = true;
530 }
531 }
532
533 out:
534 if (dev->dev_state != MEI_DEV_DISABLED && reschedule_timer)
535 mei_schedule_stall_timer(dev);
536
537 mutex_unlock(&dev->device_lock);
538 }