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1/*
2 *
3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 */
16
17#include <linux/sched.h>
18#include <linux/wait.h>
19#include <linux/delay.h>
20#include <linux/slab.h>
21#include <linux/pm_runtime.h>
22
23#include <linux/mei.h>
24
25#include "mei_dev.h"
26#include "hbm.h"
27#include "client.h"
28
29/**
30 * mei_me_cl_init - initialize me client
31 *
32 * @me_cl: me client
33 */
34void mei_me_cl_init(struct mei_me_client *me_cl)
35{
36 INIT_LIST_HEAD(&me_cl->list);
37 kref_init(&me_cl->refcnt);
38}
39
40/**
41 * mei_me_cl_get - increases me client refcount
42 *
43 * @me_cl: me client
44 *
45 * Locking: called under "dev->device_lock" lock
46 *
47 * Return: me client or NULL
48 */
49struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl)
50{
51 if (me_cl && kref_get_unless_zero(&me_cl->refcnt))
52 return me_cl;
53
54 return NULL;
55}
56
57/**
58 * mei_me_cl_release - free me client
59 *
60 * Locking: called under "dev->device_lock" lock
61 *
62 * @ref: me_client refcount
63 */
64static void mei_me_cl_release(struct kref *ref)
65{
66 struct mei_me_client *me_cl =
67 container_of(ref, struct mei_me_client, refcnt);
68
69 kfree(me_cl);
70}
71
72/**
73 * mei_me_cl_put - decrease me client refcount and free client if necessary
74 *
75 * Locking: called under "dev->device_lock" lock
76 *
77 * @me_cl: me client
78 */
79void mei_me_cl_put(struct mei_me_client *me_cl)
80{
81 if (me_cl)
82 kref_put(&me_cl->refcnt, mei_me_cl_release);
83}
84
85/**
86 * __mei_me_cl_del - delete me client from the list and decrease
87 * reference counter
88 *
89 * @dev: mei device
90 * @me_cl: me client
91 *
92 * Locking: dev->me_clients_rwsem
93 */
94static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
95{
96 if (!me_cl)
97 return;
98
99 list_del_init(&me_cl->list);
100 mei_me_cl_put(me_cl);
101}
102
103/**
104 * mei_me_cl_del - delete me client from the list and decrease
105 * reference counter
106 *
107 * @dev: mei device
108 * @me_cl: me client
109 */
110void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
111{
112 down_write(&dev->me_clients_rwsem);
113 __mei_me_cl_del(dev, me_cl);
114 up_write(&dev->me_clients_rwsem);
115}
116
117/**
118 * mei_me_cl_add - add me client to the list
119 *
120 * @dev: mei device
121 * @me_cl: me client
122 */
123void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl)
124{
125 down_write(&dev->me_clients_rwsem);
126 list_add(&me_cl->list, &dev->me_clients);
127 up_write(&dev->me_clients_rwsem);
128}
129
130/**
131 * __mei_me_cl_by_uuid - locate me client by uuid
132 * increases ref count
133 *
134 * @dev: mei device
135 * @uuid: me client uuid
136 *
137 * Return: me client or NULL if not found
138 *
139 * Locking: dev->me_clients_rwsem
140 */
141static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev,
142 const uuid_le *uuid)
143{
144 struct mei_me_client *me_cl;
145 const uuid_le *pn;
146
147 WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
148
149 list_for_each_entry(me_cl, &dev->me_clients, list) {
150 pn = &me_cl->props.protocol_name;
151 if (uuid_le_cmp(*uuid, *pn) == 0)
152 return mei_me_cl_get(me_cl);
153 }
154
155 return NULL;
156}
157
158/**
159 * mei_me_cl_by_uuid - locate me client by uuid
160 * increases ref count
161 *
162 * @dev: mei device
163 * @uuid: me client uuid
164 *
165 * Return: me client or NULL if not found
166 *
167 * Locking: dev->me_clients_rwsem
168 */
169struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
170 const uuid_le *uuid)
171{
172 struct mei_me_client *me_cl;
173
174 down_read(&dev->me_clients_rwsem);
175 me_cl = __mei_me_cl_by_uuid(dev, uuid);
176 up_read(&dev->me_clients_rwsem);
177
178 return me_cl;
179}
180
181/**
182 * mei_me_cl_by_id - locate me client by client id
183 * increases ref count
184 *
185 * @dev: the device structure
186 * @client_id: me client id
187 *
188 * Return: me client or NULL if not found
189 *
190 * Locking: dev->me_clients_rwsem
191 */
192struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
193{
194
195 struct mei_me_client *__me_cl, *me_cl = NULL;
196
197 down_read(&dev->me_clients_rwsem);
198 list_for_each_entry(__me_cl, &dev->me_clients, list) {
199 if (__me_cl->client_id == client_id) {
200 me_cl = mei_me_cl_get(__me_cl);
201 break;
202 }
203 }
204 up_read(&dev->me_clients_rwsem);
205
206 return me_cl;
207}
208
209/**
210 * __mei_me_cl_by_uuid_id - locate me client by client id and uuid
211 * increases ref count
212 *
213 * @dev: the device structure
214 * @uuid: me client uuid
215 * @client_id: me client id
216 *
217 * Return: me client or null if not found
218 *
219 * Locking: dev->me_clients_rwsem
220 */
221static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev,
222 const uuid_le *uuid, u8 client_id)
223{
224 struct mei_me_client *me_cl;
225 const uuid_le *pn;
226
227 WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
228
229 list_for_each_entry(me_cl, &dev->me_clients, list) {
230 pn = &me_cl->props.protocol_name;
231 if (uuid_le_cmp(*uuid, *pn) == 0 &&
232 me_cl->client_id == client_id)
233 return mei_me_cl_get(me_cl);
234 }
235
236 return NULL;
237}
238
239
240/**
241 * mei_me_cl_by_uuid_id - locate me client by client id and uuid
242 * increases ref count
243 *
244 * @dev: the device structure
245 * @uuid: me client uuid
246 * @client_id: me client id
247 *
248 * Return: me client or null if not found
249 */
250struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
251 const uuid_le *uuid, u8 client_id)
252{
253 struct mei_me_client *me_cl;
254
255 down_read(&dev->me_clients_rwsem);
256 me_cl = __mei_me_cl_by_uuid_id(dev, uuid, client_id);
257 up_read(&dev->me_clients_rwsem);
258
259 return me_cl;
260}
261
262/**
263 * mei_me_cl_rm_by_uuid - remove all me clients matching uuid
264 *
265 * @dev: the device structure
266 * @uuid: me client uuid
267 *
268 * Locking: called under "dev->device_lock" lock
269 */
270void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
271{
272 struct mei_me_client *me_cl;
273
274 dev_dbg(dev->dev, "remove %pUl\n", uuid);
275
276 down_write(&dev->me_clients_rwsem);
277 me_cl = __mei_me_cl_by_uuid(dev, uuid);
278 __mei_me_cl_del(dev, me_cl);
279 up_write(&dev->me_clients_rwsem);
280}
281
282/**
283 * mei_me_cl_rm_by_uuid_id - remove all me clients matching client id
284 *
285 * @dev: the device structure
286 * @uuid: me client uuid
287 * @id: me client id
288 *
289 * Locking: called under "dev->device_lock" lock
290 */
291void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id)
292{
293 struct mei_me_client *me_cl;
294
295 dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id);
296
297 down_write(&dev->me_clients_rwsem);
298 me_cl = __mei_me_cl_by_uuid_id(dev, uuid, id);
299 __mei_me_cl_del(dev, me_cl);
300 up_write(&dev->me_clients_rwsem);
301}
302
303/**
304 * mei_me_cl_rm_all - remove all me clients
305 *
306 * @dev: the device structure
307 *
308 * Locking: called under "dev->device_lock" lock
309 */
310void mei_me_cl_rm_all(struct mei_device *dev)
311{
312 struct mei_me_client *me_cl, *next;
313
314 down_write(&dev->me_clients_rwsem);
315 list_for_each_entry_safe(me_cl, next, &dev->me_clients, list)
316 __mei_me_cl_del(dev, me_cl);
317 up_write(&dev->me_clients_rwsem);
318}
319
320/**
321 * mei_cl_cmp_id - tells if the clients are the same
322 *
323 * @cl1: host client 1
324 * @cl2: host client 2
325 *
326 * Return: true - if the clients has same host and me ids
327 * false - otherwise
328 */
329static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
330 const struct mei_cl *cl2)
331{
332 return cl1 && cl2 &&
333 (cl1->host_client_id == cl2->host_client_id) &&
334 (mei_cl_me_id(cl1) == mei_cl_me_id(cl2));
335}
336
337/**
338 * mei_io_cb_free - free mei_cb_private related memory
339 *
340 * @cb: mei callback struct
341 */
342void mei_io_cb_free(struct mei_cl_cb *cb)
343{
344 if (cb == NULL)
345 return;
346
347 list_del(&cb->list);
348 kfree(cb->buf.data);
349 kfree(cb);
350}
351
352/**
353 * mei_io_cb_init - allocate and initialize io callback
354 *
355 * @cl: mei client
356 * @type: operation type
357 * @fp: pointer to file structure
358 *
359 * Return: mei_cl_cb pointer or NULL;
360 */
361struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
362 const struct file *fp)
363{
364 struct mei_cl_cb *cb;
365
366 cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
367 if (!cb)
368 return NULL;
369
370 INIT_LIST_HEAD(&cb->list);
371 cb->fp = fp;
372 cb->cl = cl;
373 cb->buf_idx = 0;
374 cb->fop_type = type;
375 return cb;
376}
377
378/**
379 * __mei_io_list_flush - removes and frees cbs belonging to cl.
380 *
381 * @list: an instance of our list structure
382 * @cl: host client, can be NULL for flushing the whole list
383 * @free: whether to free the cbs
384 */
385static void __mei_io_list_flush(struct mei_cl_cb *list,
386 struct mei_cl *cl, bool free)
387{
388 struct mei_cl_cb *cb, *next;
389
390 /* enable removing everything if no cl is specified */
391 list_for_each_entry_safe(cb, next, &list->list, list) {
392 if (!cl || mei_cl_cmp_id(cl, cb->cl)) {
393 list_del_init(&cb->list);
394 if (free)
395 mei_io_cb_free(cb);
396 }
397 }
398}
399
400/**
401 * mei_io_list_flush - removes list entry belonging to cl.
402 *
403 * @list: An instance of our list structure
404 * @cl: host client
405 */
406void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
407{
408 __mei_io_list_flush(list, cl, false);
409}
410
411/**
412 * mei_io_list_free - removes cb belonging to cl and free them
413 *
414 * @list: An instance of our list structure
415 * @cl: host client
416 */
417static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl)
418{
419 __mei_io_list_flush(list, cl, true);
420}
421
422/**
423 * mei_io_cb_alloc_buf - allocate callback buffer
424 *
425 * @cb: io callback structure
426 * @length: size of the buffer
427 *
428 * Return: 0 on success
429 * -EINVAL if cb is NULL
430 * -ENOMEM if allocation failed
431 */
432int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length)
433{
434 if (!cb)
435 return -EINVAL;
436
437 if (length == 0)
438 return 0;
439
440 cb->buf.data = kmalloc(length, GFP_KERNEL);
441 if (!cb->buf.data)
442 return -ENOMEM;
443 cb->buf.size = length;
444 return 0;
445}
446
447/**
448 * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
449 *
450 * @cl: host client
451 * @length: size of the buffer
452 * @type: operation type
453 * @fp: associated file pointer (might be NULL)
454 *
455 * Return: cb on success and NULL on failure
456 */
457struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
458 enum mei_cb_file_ops type,
459 const struct file *fp)
460{
461 struct mei_cl_cb *cb;
462
463 cb = mei_io_cb_init(cl, type, fp);
464 if (!cb)
465 return NULL;
466
467 if (mei_io_cb_alloc_buf(cb, length)) {
468 mei_io_cb_free(cb);
469 return NULL;
470 }
471
472 return cb;
473}
474
475/**
476 * mei_cl_read_cb - find this cl's callback in the read list
477 * for a specific file
478 *
479 * @cl: host client
480 * @fp: file pointer (matching cb file object), may be NULL
481 *
482 * Return: cb on success, NULL if cb is not found
483 */
484struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp)
485{
486 struct mei_cl_cb *cb;
487
488 list_for_each_entry(cb, &cl->rd_completed, list)
489 if (!fp || fp == cb->fp)
490 return cb;
491
492 return NULL;
493}
494
495/**
496 * mei_cl_read_cb_flush - free client's read pending and completed cbs
497 * for a specific file
498 *
499 * @cl: host client
500 * @fp: file pointer (matching cb file object), may be NULL
501 */
502void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp)
503{
504 struct mei_cl_cb *cb, *next;
505
506 list_for_each_entry_safe(cb, next, &cl->rd_completed, list)
507 if (!fp || fp == cb->fp)
508 mei_io_cb_free(cb);
509
510
511 list_for_each_entry_safe(cb, next, &cl->rd_pending, list)
512 if (!fp || fp == cb->fp)
513 mei_io_cb_free(cb);
514}
515
516/**
517 * mei_cl_flush_queues - flushes queue lists belonging to cl.
518 *
519 * @cl: host client
520 * @fp: file pointer (matching cb file object), may be NULL
521 *
522 * Return: 0 on success, -EINVAL if cl or cl->dev is NULL.
523 */
524int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
525{
526 struct mei_device *dev;
527
528 if (WARN_ON(!cl || !cl->dev))
529 return -EINVAL;
530
531 dev = cl->dev;
532
533 cl_dbg(dev, cl, "remove list entry belonging to cl\n");
534 mei_io_list_free(&cl->dev->write_list, cl);
535 mei_io_list_free(&cl->dev->write_waiting_list, cl);
536 mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
537 mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
538 mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
539
540 mei_cl_read_cb_flush(cl, fp);
541
542 return 0;
543}
544
545
546/**
547 * mei_cl_init - initializes cl.
548 *
549 * @cl: host client to be initialized
550 * @dev: mei device
551 */
552void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
553{
554 memset(cl, 0, sizeof(struct mei_cl));
555 init_waitqueue_head(&cl->wait);
556 init_waitqueue_head(&cl->rx_wait);
557 init_waitqueue_head(&cl->tx_wait);
558 init_waitqueue_head(&cl->ev_wait);
559 INIT_LIST_HEAD(&cl->rd_completed);
560 INIT_LIST_HEAD(&cl->rd_pending);
561 INIT_LIST_HEAD(&cl->link);
562 cl->writing_state = MEI_IDLE;
563 cl->state = MEI_FILE_INITIALIZING;
564 cl->dev = dev;
565}
566
567/**
568 * mei_cl_allocate - allocates cl structure and sets it up.
569 *
570 * @dev: mei device
571 * Return: The allocated file or NULL on failure
572 */
573struct mei_cl *mei_cl_allocate(struct mei_device *dev)
574{
575 struct mei_cl *cl;
576
577 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
578 if (!cl)
579 return NULL;
580
581 mei_cl_init(cl, dev);
582
583 return cl;
584}
585
586/**
587 * mei_cl_link - allocate host id in the host map
588 *
589 * @cl: host client
590 *
591 * Return: 0 on success
592 * -EINVAL on incorrect values
593 * -EMFILE if open count exceeded.
594 */
595int mei_cl_link(struct mei_cl *cl)
596{
597 struct mei_device *dev;
598 long open_handle_count;
599 int id;
600
601 if (WARN_ON(!cl || !cl->dev))
602 return -EINVAL;
603
604 dev = cl->dev;
605
606 id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX);
607 if (id >= MEI_CLIENTS_MAX) {
608 dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX);
609 return -EMFILE;
610 }
611
612 open_handle_count = dev->open_handle_count + dev->iamthif_open_count;
613 if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
614 dev_err(dev->dev, "open_handle_count exceeded %d",
615 MEI_MAX_OPEN_HANDLE_COUNT);
616 return -EMFILE;
617 }
618
619 dev->open_handle_count++;
620
621 cl->host_client_id = id;
622 list_add_tail(&cl->link, &dev->file_list);
623
624 set_bit(id, dev->host_clients_map);
625
626 cl->state = MEI_FILE_INITIALIZING;
627
628 cl_dbg(dev, cl, "link cl\n");
629 return 0;
630}
631
632/**
633 * mei_cl_unlink - remove host client from the list
634 *
635 * @cl: host client
636 *
637 * Return: always 0
638 */
639int mei_cl_unlink(struct mei_cl *cl)
640{
641 struct mei_device *dev;
642
643 /* don't shout on error exit path */
644 if (!cl)
645 return 0;
646
647 /* amthif might not be initialized */
648 if (!cl->dev)
649 return 0;
650
651 dev = cl->dev;
652
653 cl_dbg(dev, cl, "unlink client");
654
655 if (dev->open_handle_count > 0)
656 dev->open_handle_count--;
657
658 /* never clear the 0 bit */
659 if (cl->host_client_id)
660 clear_bit(cl->host_client_id, dev->host_clients_map);
661
662 list_del_init(&cl->link);
663
664 cl->state = MEI_FILE_INITIALIZING;
665
666 return 0;
667}
668
669void mei_host_client_init(struct mei_device *dev)
670{
671 dev->dev_state = MEI_DEV_ENABLED;
672 dev->reset_count = 0;
673
674 schedule_work(&dev->bus_rescan_work);
675
676 pm_runtime_mark_last_busy(dev->dev);
677 dev_dbg(dev->dev, "rpm: autosuspend\n");
678 pm_runtime_autosuspend(dev->dev);
679}
680
681/**
682 * mei_hbuf_acquire - try to acquire host buffer
683 *
684 * @dev: the device structure
685 * Return: true if host buffer was acquired
686 */
687bool mei_hbuf_acquire(struct mei_device *dev)
688{
689 if (mei_pg_state(dev) == MEI_PG_ON ||
690 mei_pg_in_transition(dev)) {
691 dev_dbg(dev->dev, "device is in pg\n");
692 return false;
693 }
694
695 if (!dev->hbuf_is_ready) {
696 dev_dbg(dev->dev, "hbuf is not ready\n");
697 return false;
698 }
699
700 dev->hbuf_is_ready = false;
701
702 return true;
703}
704
705/**
706 * mei_cl_wake_all - wake up readers, writers and event waiters so
707 * they can be interrupted
708 *
709 * @cl: host client
710 */
711static void mei_cl_wake_all(struct mei_cl *cl)
712{
713 struct mei_device *dev = cl->dev;
714
715 /* synchronized under device mutex */
716 if (waitqueue_active(&cl->rx_wait)) {
717 cl_dbg(dev, cl, "Waking up reading client!\n");
718 wake_up_interruptible(&cl->rx_wait);
719 }
720 /* synchronized under device mutex */
721 if (waitqueue_active(&cl->tx_wait)) {
722 cl_dbg(dev, cl, "Waking up writing client!\n");
723 wake_up_interruptible(&cl->tx_wait);
724 }
725 /* synchronized under device mutex */
726 if (waitqueue_active(&cl->ev_wait)) {
727 cl_dbg(dev, cl, "Waking up waiting for event clients!\n");
728 wake_up_interruptible(&cl->ev_wait);
729 }
730}
731
732/**
733 * mei_cl_set_disconnected - set disconnected state and clear
734 * associated states and resources
735 *
736 * @cl: host client
737 */
738void mei_cl_set_disconnected(struct mei_cl *cl)
739{
740 struct mei_device *dev = cl->dev;
741
742 if (cl->state == MEI_FILE_DISCONNECTED ||
743 cl->state == MEI_FILE_INITIALIZING)
744 return;
745
746 cl->state = MEI_FILE_DISCONNECTED;
747 mei_io_list_free(&dev->write_list, cl);
748 mei_io_list_free(&dev->write_waiting_list, cl);
749 mei_io_list_flush(&dev->ctrl_rd_list, cl);
750 mei_io_list_flush(&dev->ctrl_wr_list, cl);
751 mei_cl_wake_all(cl);
752 cl->mei_flow_ctrl_creds = 0;
753 cl->timer_count = 0;
754
755 if (!cl->me_cl)
756 return;
757
758 if (!WARN_ON(cl->me_cl->connect_count == 0))
759 cl->me_cl->connect_count--;
760
761 if (cl->me_cl->connect_count == 0)
762 cl->me_cl->mei_flow_ctrl_creds = 0;
763
764 mei_me_cl_put(cl->me_cl);
765 cl->me_cl = NULL;
766}
767
768static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl)
769{
770 if (!mei_me_cl_get(me_cl))
771 return -ENOENT;
772
773 /* only one connection is allowed for fixed address clients */
774 if (me_cl->props.fixed_address) {
775 if (me_cl->connect_count) {
776 mei_me_cl_put(me_cl);
777 return -EBUSY;
778 }
779 }
780
781 cl->me_cl = me_cl;
782 cl->state = MEI_FILE_CONNECTING;
783 cl->me_cl->connect_count++;
784
785 return 0;
786}
787
788/*
789 * mei_cl_send_disconnect - send disconnect request
790 *
791 * @cl: host client
792 * @cb: callback block
793 *
794 * Return: 0, OK; otherwise, error.
795 */
796static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb)
797{
798 struct mei_device *dev;
799 int ret;
800
801 dev = cl->dev;
802
803 ret = mei_hbm_cl_disconnect_req(dev, cl);
804 cl->status = ret;
805 if (ret) {
806 cl->state = MEI_FILE_DISCONNECT_REPLY;
807 return ret;
808 }
809
810 list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
811 cl->timer_count = MEI_CONNECT_TIMEOUT;
812
813 return 0;
814}
815
816/**
817 * mei_cl_irq_disconnect - processes close related operation from
818 * interrupt thread context - send disconnect request
819 *
820 * @cl: client
821 * @cb: callback block.
822 * @cmpl_list: complete list.
823 *
824 * Return: 0, OK; otherwise, error.
825 */
826int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
827 struct mei_cl_cb *cmpl_list)
828{
829 struct mei_device *dev = cl->dev;
830 u32 msg_slots;
831 int slots;
832 int ret;
833
834 msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
835 slots = mei_hbuf_empty_slots(dev);
836
837 if (slots < msg_slots)
838 return -EMSGSIZE;
839
840 ret = mei_cl_send_disconnect(cl, cb);
841 if (ret)
842 list_move_tail(&cb->list, &cmpl_list->list);
843
844 return ret;
845}
846
847/**
848 * __mei_cl_disconnect - disconnect host client from the me one
849 * internal function runtime pm has to be already acquired
850 *
851 * @cl: host client
852 *
853 * Return: 0 on success, <0 on failure.
854 */
855static int __mei_cl_disconnect(struct mei_cl *cl)
856{
857 struct mei_device *dev;
858 struct mei_cl_cb *cb;
859 int rets;
860
861 dev = cl->dev;
862
863 cl->state = MEI_FILE_DISCONNECTING;
864
865 cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL);
866 rets = cb ? 0 : -ENOMEM;
867 if (rets)
868 goto out;
869
870 cl_dbg(dev, cl, "add disconnect cb to control write list\n");
871 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
872
873 if (mei_hbuf_acquire(dev)) {
874 rets = mei_cl_send_disconnect(cl, cb);
875 if (rets) {
876 cl_err(dev, cl, "failed to disconnect.\n");
877 goto out;
878 }
879 }
880
881 mutex_unlock(&dev->device_lock);
882 wait_event_timeout(cl->wait, cl->state == MEI_FILE_DISCONNECT_REPLY,
883 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
884 mutex_lock(&dev->device_lock);
885
886 rets = cl->status;
887 if (cl->state != MEI_FILE_DISCONNECT_REPLY) {
888 cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
889 rets = -ETIME;
890 }
891
892out:
893 /* we disconnect also on error */
894 mei_cl_set_disconnected(cl);
895 if (!rets)
896 cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
897
898 mei_io_cb_free(cb);
899 return rets;
900}
901
902/**
903 * mei_cl_disconnect - disconnect host client from the me one
904 *
905 * @cl: host client
906 *
907 * Locking: called under "dev->device_lock" lock
908 *
909 * Return: 0 on success, <0 on failure.
910 */
911int mei_cl_disconnect(struct mei_cl *cl)
912{
913 struct mei_device *dev;
914 int rets;
915
916 if (WARN_ON(!cl || !cl->dev))
917 return -ENODEV;
918
919 dev = cl->dev;
920
921 cl_dbg(dev, cl, "disconnecting");
922
923 if (!mei_cl_is_connected(cl))
924 return 0;
925
926 if (mei_cl_is_fixed_address(cl)) {
927 mei_cl_set_disconnected(cl);
928 return 0;
929 }
930
931 rets = pm_runtime_get(dev->dev);
932 if (rets < 0 && rets != -EINPROGRESS) {
933 pm_runtime_put_noidle(dev->dev);
934 cl_err(dev, cl, "rpm: get failed %d\n", rets);
935 return rets;
936 }
937
938 rets = __mei_cl_disconnect(cl);
939
940 cl_dbg(dev, cl, "rpm: autosuspend\n");
941 pm_runtime_mark_last_busy(dev->dev);
942 pm_runtime_put_autosuspend(dev->dev);
943
944 return rets;
945}
946
947
948/**
949 * mei_cl_is_other_connecting - checks if other
950 * client with the same me client id is connecting
951 *
952 * @cl: private data of the file object
953 *
954 * Return: true if other client is connected, false - otherwise.
955 */
956static bool mei_cl_is_other_connecting(struct mei_cl *cl)
957{
958 struct mei_device *dev;
959 struct mei_cl_cb *cb;
960
961 dev = cl->dev;
962
963 list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) {
964 if (cb->fop_type == MEI_FOP_CONNECT &&
965 mei_cl_me_id(cl) == mei_cl_me_id(cb->cl))
966 return true;
967 }
968
969 return false;
970}
971
972/**
973 * mei_cl_send_connect - send connect request
974 *
975 * @cl: host client
976 * @cb: callback block
977 *
978 * Return: 0, OK; otherwise, error.
979 */
980static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
981{
982 struct mei_device *dev;
983 int ret;
984
985 dev = cl->dev;
986
987 ret = mei_hbm_cl_connect_req(dev, cl);
988 cl->status = ret;
989 if (ret) {
990 cl->state = MEI_FILE_DISCONNECT_REPLY;
991 return ret;
992 }
993
994 list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
995 cl->timer_count = MEI_CONNECT_TIMEOUT;
996 return 0;
997}
998
999/**
1000 * mei_cl_irq_connect - send connect request in irq_thread context
1001 *
1002 * @cl: host client
1003 * @cb: callback block
1004 * @cmpl_list: complete list
1005 *
1006 * Return: 0, OK; otherwise, error.
1007 */
1008int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
1009 struct mei_cl_cb *cmpl_list)
1010{
1011 struct mei_device *dev = cl->dev;
1012 u32 msg_slots;
1013 int slots;
1014 int rets;
1015
1016 msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
1017 slots = mei_hbuf_empty_slots(dev);
1018
1019 if (mei_cl_is_other_connecting(cl))
1020 return 0;
1021
1022 if (slots < msg_slots)
1023 return -EMSGSIZE;
1024
1025 rets = mei_cl_send_connect(cl, cb);
1026 if (rets)
1027 list_move_tail(&cb->list, &cmpl_list->list);
1028
1029 return rets;
1030}
1031
1032/**
1033 * mei_cl_connect - connect host client to the me one
1034 *
1035 * @cl: host client
1036 * @me_cl: me client
1037 * @file: pointer to file structure
1038 *
1039 * Locking: called under "dev->device_lock" lock
1040 *
1041 * Return: 0 on success, <0 on failure.
1042 */
1043int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
1044 const struct file *file)
1045{
1046 struct mei_device *dev;
1047 struct mei_cl_cb *cb;
1048 int rets;
1049
1050 if (WARN_ON(!cl || !cl->dev || !me_cl))
1051 return -ENODEV;
1052
1053 dev = cl->dev;
1054
1055 rets = mei_cl_set_connecting(cl, me_cl);
1056 if (rets)
1057 return rets;
1058
1059 if (mei_cl_is_fixed_address(cl)) {
1060 cl->state = MEI_FILE_CONNECTED;
1061 return 0;
1062 }
1063
1064 rets = pm_runtime_get(dev->dev);
1065 if (rets < 0 && rets != -EINPROGRESS) {
1066 pm_runtime_put_noidle(dev->dev);
1067 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1068 goto nortpm;
1069 }
1070
1071 cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file);
1072 rets = cb ? 0 : -ENOMEM;
1073 if (rets)
1074 goto out;
1075
1076 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1077
1078 /* run hbuf acquire last so we don't have to undo */
1079 if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
1080 rets = mei_cl_send_connect(cl, cb);
1081 if (rets)
1082 goto out;
1083 }
1084
1085 mutex_unlock(&dev->device_lock);
1086 wait_event_timeout(cl->wait,
1087 (cl->state == MEI_FILE_CONNECTED ||
1088 cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
1089 cl->state == MEI_FILE_DISCONNECT_REPLY),
1090 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
1091 mutex_lock(&dev->device_lock);
1092
1093 if (!mei_cl_is_connected(cl)) {
1094 if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) {
1095 mei_io_list_flush(&dev->ctrl_rd_list, cl);
1096 mei_io_list_flush(&dev->ctrl_wr_list, cl);
1097 /* ignore disconnect return valuue;
1098 * in case of failure reset will be invoked
1099 */
1100 __mei_cl_disconnect(cl);
1101 rets = -EFAULT;
1102 goto out;
1103 }
1104
1105 /* timeout or something went really wrong */
1106 if (!cl->status)
1107 cl->status = -EFAULT;
1108 }
1109
1110 rets = cl->status;
1111out:
1112 cl_dbg(dev, cl, "rpm: autosuspend\n");
1113 pm_runtime_mark_last_busy(dev->dev);
1114 pm_runtime_put_autosuspend(dev->dev);
1115
1116 mei_io_cb_free(cb);
1117
1118nortpm:
1119 if (!mei_cl_is_connected(cl))
1120 mei_cl_set_disconnected(cl);
1121
1122 return rets;
1123}
1124
1125/**
1126 * mei_cl_alloc_linked - allocate and link host client
1127 *
1128 * @dev: the device structure
1129 *
1130 * Return: cl on success ERR_PTR on failure
1131 */
1132struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev)
1133{
1134 struct mei_cl *cl;
1135 int ret;
1136
1137 cl = mei_cl_allocate(dev);
1138 if (!cl) {
1139 ret = -ENOMEM;
1140 goto err;
1141 }
1142
1143 ret = mei_cl_link(cl);
1144 if (ret)
1145 goto err;
1146
1147 return cl;
1148err:
1149 kfree(cl);
1150 return ERR_PTR(ret);
1151}
1152
1153
1154
1155/**
1156 * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
1157 *
1158 * @cl: host client
1159 * @fp: the file pointer associated with the pointer
1160 *
1161 * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
1162 */
1163static int mei_cl_flow_ctrl_creds(struct mei_cl *cl, const struct file *fp)
1164{
1165 int rets;
1166
1167 if (WARN_ON(!cl || !cl->me_cl))
1168 return -EINVAL;
1169
1170 if (cl->mei_flow_ctrl_creds > 0)
1171 return 1;
1172
1173 if (mei_cl_is_fixed_address(cl)) {
1174 rets = mei_cl_read_start(cl, mei_cl_mtu(cl), fp);
1175 if (rets && rets != -EBUSY)
1176 return rets;
1177 return 1;
1178 }
1179
1180 if (mei_cl_is_single_recv_buf(cl)) {
1181 if (cl->me_cl->mei_flow_ctrl_creds > 0)
1182 return 1;
1183 }
1184 return 0;
1185}
1186
1187/**
1188 * mei_cl_flow_ctrl_reduce - reduces flow_control.
1189 *
1190 * @cl: private data of the file object
1191 *
1192 * Return:
1193 * 0 on success
1194 * -EINVAL when ctrl credits are <= 0
1195 */
1196static int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
1197{
1198 if (WARN_ON(!cl || !cl->me_cl))
1199 return -EINVAL;
1200
1201 if (mei_cl_is_fixed_address(cl))
1202 return 0;
1203
1204 if (mei_cl_is_single_recv_buf(cl)) {
1205 if (WARN_ON(cl->me_cl->mei_flow_ctrl_creds <= 0))
1206 return -EINVAL;
1207 cl->me_cl->mei_flow_ctrl_creds--;
1208 } else {
1209 if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
1210 return -EINVAL;
1211 cl->mei_flow_ctrl_creds--;
1212 }
1213 return 0;
1214}
1215
1216/**
1217 * mei_cl_notify_fop2req - convert fop to proper request
1218 *
1219 * @fop: client notification start response command
1220 *
1221 * Return: MEI_HBM_NOTIFICATION_START/STOP
1222 */
1223u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop)
1224{
1225 if (fop == MEI_FOP_NOTIFY_START)
1226 return MEI_HBM_NOTIFICATION_START;
1227 else
1228 return MEI_HBM_NOTIFICATION_STOP;
1229}
1230
1231/**
1232 * mei_cl_notify_req2fop - convert notification request top file operation type
1233 *
1234 * @req: hbm notification request type
1235 *
1236 * Return: MEI_FOP_NOTIFY_START/STOP
1237 */
1238enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req)
1239{
1240 if (req == MEI_HBM_NOTIFICATION_START)
1241 return MEI_FOP_NOTIFY_START;
1242 else
1243 return MEI_FOP_NOTIFY_STOP;
1244}
1245
1246/**
1247 * mei_cl_irq_notify - send notification request in irq_thread context
1248 *
1249 * @cl: client
1250 * @cb: callback block.
1251 * @cmpl_list: complete list.
1252 *
1253 * Return: 0 on such and error otherwise.
1254 */
1255int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb,
1256 struct mei_cl_cb *cmpl_list)
1257{
1258 struct mei_device *dev = cl->dev;
1259 u32 msg_slots;
1260 int slots;
1261 int ret;
1262 bool request;
1263
1264 msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
1265 slots = mei_hbuf_empty_slots(dev);
1266
1267 if (slots < msg_slots)
1268 return -EMSGSIZE;
1269
1270 request = mei_cl_notify_fop2req(cb->fop_type);
1271 ret = mei_hbm_cl_notify_req(dev, cl, request);
1272 if (ret) {
1273 cl->status = ret;
1274 list_move_tail(&cb->list, &cmpl_list->list);
1275 return ret;
1276 }
1277
1278 list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
1279 return 0;
1280}
1281
1282/**
1283 * mei_cl_notify_request - send notification stop/start request
1284 *
1285 * @cl: host client
1286 * @file: associate request with file
1287 * @request: 1 for start or 0 for stop
1288 *
1289 * Locking: called under "dev->device_lock" lock
1290 *
1291 * Return: 0 on such and error otherwise.
1292 */
1293int mei_cl_notify_request(struct mei_cl *cl,
1294 const struct file *file, u8 request)
1295{
1296 struct mei_device *dev;
1297 struct mei_cl_cb *cb;
1298 enum mei_cb_file_ops fop_type;
1299 int rets;
1300
1301 if (WARN_ON(!cl || !cl->dev))
1302 return -ENODEV;
1303
1304 dev = cl->dev;
1305
1306 if (!dev->hbm_f_ev_supported) {
1307 cl_dbg(dev, cl, "notifications not supported\n");
1308 return -EOPNOTSUPP;
1309 }
1310
1311 rets = pm_runtime_get(dev->dev);
1312 if (rets < 0 && rets != -EINPROGRESS) {
1313 pm_runtime_put_noidle(dev->dev);
1314 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1315 return rets;
1316 }
1317
1318 fop_type = mei_cl_notify_req2fop(request);
1319 cb = mei_io_cb_init(cl, fop_type, file);
1320 if (!cb) {
1321 rets = -ENOMEM;
1322 goto out;
1323 }
1324
1325 if (mei_hbuf_acquire(dev)) {
1326 if (mei_hbm_cl_notify_req(dev, cl, request)) {
1327 rets = -ENODEV;
1328 goto out;
1329 }
1330 list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
1331 } else {
1332 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1333 }
1334
1335 mutex_unlock(&dev->device_lock);
1336 wait_event_timeout(cl->wait, cl->notify_en == request,
1337 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
1338 mutex_lock(&dev->device_lock);
1339
1340 if (cl->notify_en != request) {
1341 mei_io_list_flush(&dev->ctrl_rd_list, cl);
1342 mei_io_list_flush(&dev->ctrl_wr_list, cl);
1343 if (!cl->status)
1344 cl->status = -EFAULT;
1345 }
1346
1347 rets = cl->status;
1348
1349out:
1350 cl_dbg(dev, cl, "rpm: autosuspend\n");
1351 pm_runtime_mark_last_busy(dev->dev);
1352 pm_runtime_put_autosuspend(dev->dev);
1353
1354 mei_io_cb_free(cb);
1355 return rets;
1356}
1357
1358/**
1359 * mei_cl_notify - raise notification
1360 *
1361 * @cl: host client
1362 *
1363 * Locking: called under "dev->device_lock" lock
1364 */
1365void mei_cl_notify(struct mei_cl *cl)
1366{
1367 struct mei_device *dev;
1368
1369 if (!cl || !cl->dev)
1370 return;
1371
1372 dev = cl->dev;
1373
1374 if (!cl->notify_en)
1375 return;
1376
1377 cl_dbg(dev, cl, "notify event");
1378 cl->notify_ev = true;
1379 if (!mei_cl_bus_notify_event(cl))
1380 wake_up_interruptible(&cl->ev_wait);
1381
1382 if (cl->ev_async)
1383 kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);
1384
1385}
1386
1387/**
1388 * mei_cl_notify_get - get or wait for notification event
1389 *
1390 * @cl: host client
1391 * @block: this request is blocking
1392 * @notify_ev: true if notification event was received
1393 *
1394 * Locking: called under "dev->device_lock" lock
1395 *
1396 * Return: 0 on such and error otherwise.
1397 */
1398int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev)
1399{
1400 struct mei_device *dev;
1401 int rets;
1402
1403 *notify_ev = false;
1404
1405 if (WARN_ON(!cl || !cl->dev))
1406 return -ENODEV;
1407
1408 dev = cl->dev;
1409
1410 if (!mei_cl_is_connected(cl))
1411 return -ENODEV;
1412
1413 if (cl->notify_ev)
1414 goto out;
1415
1416 if (!block)
1417 return -EAGAIN;
1418
1419 mutex_unlock(&dev->device_lock);
1420 rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev);
1421 mutex_lock(&dev->device_lock);
1422
1423 if (rets < 0)
1424 return rets;
1425
1426out:
1427 *notify_ev = cl->notify_ev;
1428 cl->notify_ev = false;
1429 return 0;
1430}
1431
1432/**
1433 * mei_cl_is_read_fc_cb - check if read cb is waiting for flow control
1434 * for given host client
1435 *
1436 * @cl: host client
1437 *
1438 * Return: true, if found at least one cb.
1439 */
1440static bool mei_cl_is_read_fc_cb(struct mei_cl *cl)
1441{
1442 struct mei_device *dev = cl->dev;
1443 struct mei_cl_cb *cb;
1444
1445 list_for_each_entry(cb, &dev->ctrl_wr_list.list, list)
1446 if (cb->fop_type == MEI_FOP_READ && cb->cl == cl)
1447 return true;
1448 return false;
1449}
1450
1451/**
1452 * mei_cl_read_start - the start read client message function.
1453 *
1454 * @cl: host client
1455 * @length: number of bytes to read
1456 * @fp: pointer to file structure
1457 *
1458 * Return: 0 on success, <0 on failure.
1459 */
1460int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp)
1461{
1462 struct mei_device *dev;
1463 struct mei_cl_cb *cb;
1464 int rets;
1465
1466 if (WARN_ON(!cl || !cl->dev))
1467 return -ENODEV;
1468
1469 dev = cl->dev;
1470
1471 if (!mei_cl_is_connected(cl))
1472 return -ENODEV;
1473
1474 /* HW currently supports only one pending read */
1475 if (!list_empty(&cl->rd_pending) || mei_cl_is_read_fc_cb(cl))
1476 return -EBUSY;
1477
1478 if (!mei_me_cl_is_active(cl->me_cl)) {
1479 cl_err(dev, cl, "no such me client\n");
1480 return -ENOTTY;
1481 }
1482
1483 /* always allocate at least client max message */
1484 length = max_t(size_t, length, mei_cl_mtu(cl));
1485 cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp);
1486 if (!cb)
1487 return -ENOMEM;
1488
1489 if (mei_cl_is_fixed_address(cl)) {
1490 list_add_tail(&cb->list, &cl->rd_pending);
1491 return 0;
1492 }
1493
1494 rets = pm_runtime_get(dev->dev);
1495 if (rets < 0 && rets != -EINPROGRESS) {
1496 pm_runtime_put_noidle(dev->dev);
1497 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1498 goto nortpm;
1499 }
1500
1501 if (mei_hbuf_acquire(dev)) {
1502 rets = mei_hbm_cl_flow_control_req(dev, cl);
1503 if (rets < 0)
1504 goto out;
1505
1506 list_add_tail(&cb->list, &cl->rd_pending);
1507 } else {
1508 rets = 0;
1509 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1510 }
1511
1512out:
1513 cl_dbg(dev, cl, "rpm: autosuspend\n");
1514 pm_runtime_mark_last_busy(dev->dev);
1515 pm_runtime_put_autosuspend(dev->dev);
1516nortpm:
1517 if (rets)
1518 mei_io_cb_free(cb);
1519
1520 return rets;
1521}
1522
1523/**
1524 * mei_cl_irq_write - write a message to device
1525 * from the interrupt thread context
1526 *
1527 * @cl: client
1528 * @cb: callback block.
1529 * @cmpl_list: complete list.
1530 *
1531 * Return: 0, OK; otherwise error.
1532 */
1533int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
1534 struct mei_cl_cb *cmpl_list)
1535{
1536 struct mei_device *dev;
1537 struct mei_msg_data *buf;
1538 struct mei_msg_hdr mei_hdr;
1539 size_t len;
1540 u32 msg_slots;
1541 int slots;
1542 int rets;
1543 bool first_chunk;
1544
1545 if (WARN_ON(!cl || !cl->dev))
1546 return -ENODEV;
1547
1548 dev = cl->dev;
1549
1550 buf = &cb->buf;
1551
1552 first_chunk = cb->buf_idx == 0;
1553
1554 rets = first_chunk ? mei_cl_flow_ctrl_creds(cl, cb->fp) : 1;
1555 if (rets < 0)
1556 return rets;
1557
1558 if (rets == 0) {
1559 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1560 return 0;
1561 }
1562
1563 slots = mei_hbuf_empty_slots(dev);
1564 len = buf->size - cb->buf_idx;
1565 msg_slots = mei_data2slots(len);
1566
1567 mei_hdr.host_addr = mei_cl_host_addr(cl);
1568 mei_hdr.me_addr = mei_cl_me_id(cl);
1569 mei_hdr.reserved = 0;
1570 mei_hdr.internal = cb->internal;
1571
1572 if (slots >= msg_slots) {
1573 mei_hdr.length = len;
1574 mei_hdr.msg_complete = 1;
1575 /* Split the message only if we can write the whole host buffer */
1576 } else if (slots == dev->hbuf_depth) {
1577 msg_slots = slots;
1578 len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
1579 mei_hdr.length = len;
1580 mei_hdr.msg_complete = 0;
1581 } else {
1582 /* wait for next time the host buffer is empty */
1583 return 0;
1584 }
1585
1586 cl_dbg(dev, cl, "buf: size = %zu idx = %zu\n",
1587 cb->buf.size, cb->buf_idx);
1588
1589 rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
1590 if (rets) {
1591 cl->status = rets;
1592 list_move_tail(&cb->list, &cmpl_list->list);
1593 return rets;
1594 }
1595
1596 cl->status = 0;
1597 cl->writing_state = MEI_WRITING;
1598 cb->buf_idx += mei_hdr.length;
1599 cb->completed = mei_hdr.msg_complete == 1;
1600
1601 if (first_chunk) {
1602 if (mei_cl_flow_ctrl_reduce(cl))
1603 return -EIO;
1604 }
1605
1606 if (mei_hdr.msg_complete)
1607 list_move_tail(&cb->list, &dev->write_waiting_list.list);
1608
1609 return 0;
1610}
1611
1612/**
1613 * mei_cl_write - submit a write cb to mei device
1614 * assumes device_lock is locked
1615 *
1616 * @cl: host client
1617 * @cb: write callback with filled data
1618 * @blocking: block until completed
1619 *
1620 * Return: number of bytes sent on success, <0 on failure.
1621 */
1622int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
1623{
1624 struct mei_device *dev;
1625 struct mei_msg_data *buf;
1626 struct mei_msg_hdr mei_hdr;
1627 int size;
1628 int rets;
1629
1630
1631 if (WARN_ON(!cl || !cl->dev))
1632 return -ENODEV;
1633
1634 if (WARN_ON(!cb))
1635 return -EINVAL;
1636
1637 dev = cl->dev;
1638
1639 buf = &cb->buf;
1640 size = buf->size;
1641
1642 cl_dbg(dev, cl, "size=%d\n", size);
1643
1644 rets = pm_runtime_get(dev->dev);
1645 if (rets < 0 && rets != -EINPROGRESS) {
1646 pm_runtime_put_noidle(dev->dev);
1647 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1648 goto free;
1649 }
1650
1651 cb->buf_idx = 0;
1652 cl->writing_state = MEI_IDLE;
1653
1654 mei_hdr.host_addr = mei_cl_host_addr(cl);
1655 mei_hdr.me_addr = mei_cl_me_id(cl);
1656 mei_hdr.reserved = 0;
1657 mei_hdr.msg_complete = 0;
1658 mei_hdr.internal = cb->internal;
1659
1660 rets = mei_cl_flow_ctrl_creds(cl, cb->fp);
1661 if (rets < 0)
1662 goto err;
1663
1664 if (rets == 0) {
1665 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1666 rets = size;
1667 goto out;
1668 }
1669 if (!mei_hbuf_acquire(dev)) {
1670 cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
1671 rets = size;
1672 goto out;
1673 }
1674
1675 /* Check for a maximum length */
1676 if (size > mei_hbuf_max_len(dev)) {
1677 mei_hdr.length = mei_hbuf_max_len(dev);
1678 mei_hdr.msg_complete = 0;
1679 } else {
1680 mei_hdr.length = size;
1681 mei_hdr.msg_complete = 1;
1682 }
1683
1684 rets = mei_write_message(dev, &mei_hdr, buf->data);
1685 if (rets)
1686 goto err;
1687
1688 rets = mei_cl_flow_ctrl_reduce(cl);
1689 if (rets)
1690 goto err;
1691
1692 cl->writing_state = MEI_WRITING;
1693 cb->buf_idx = mei_hdr.length;
1694 cb->completed = mei_hdr.msg_complete == 1;
1695
1696out:
1697 if (mei_hdr.msg_complete)
1698 list_add_tail(&cb->list, &dev->write_waiting_list.list);
1699 else
1700 list_add_tail(&cb->list, &dev->write_list.list);
1701
1702 cb = NULL;
1703 if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
1704
1705 mutex_unlock(&dev->device_lock);
1706 rets = wait_event_interruptible(cl->tx_wait,
1707 cl->writing_state == MEI_WRITE_COMPLETE ||
1708 (!mei_cl_is_connected(cl)));
1709 mutex_lock(&dev->device_lock);
1710 /* wait_event_interruptible returns -ERESTARTSYS */
1711 if (rets) {
1712 if (signal_pending(current))
1713 rets = -EINTR;
1714 goto err;
1715 }
1716 if (cl->writing_state != MEI_WRITE_COMPLETE) {
1717 rets = -EFAULT;
1718 goto err;
1719 }
1720 }
1721
1722 rets = size;
1723err:
1724 cl_dbg(dev, cl, "rpm: autosuspend\n");
1725 pm_runtime_mark_last_busy(dev->dev);
1726 pm_runtime_put_autosuspend(dev->dev);
1727free:
1728 mei_io_cb_free(cb);
1729
1730 return rets;
1731}
1732
1733
1734/**
1735 * mei_cl_complete - processes completed operation for a client
1736 *
1737 * @cl: private data of the file object.
1738 * @cb: callback block.
1739 */
1740void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
1741{
1742 struct mei_device *dev = cl->dev;
1743
1744 switch (cb->fop_type) {
1745 case MEI_FOP_WRITE:
1746 mei_io_cb_free(cb);
1747 cl->writing_state = MEI_WRITE_COMPLETE;
1748 if (waitqueue_active(&cl->tx_wait)) {
1749 wake_up_interruptible(&cl->tx_wait);
1750 } else {
1751 pm_runtime_mark_last_busy(dev->dev);
1752 pm_request_autosuspend(dev->dev);
1753 }
1754 break;
1755
1756 case MEI_FOP_READ:
1757 list_add_tail(&cb->list, &cl->rd_completed);
1758 if (!mei_cl_bus_rx_event(cl))
1759 wake_up_interruptible(&cl->rx_wait);
1760 break;
1761
1762 case MEI_FOP_CONNECT:
1763 case MEI_FOP_DISCONNECT:
1764 case MEI_FOP_NOTIFY_STOP:
1765 case MEI_FOP_NOTIFY_START:
1766 if (waitqueue_active(&cl->wait))
1767 wake_up(&cl->wait);
1768
1769 break;
1770 default:
1771 BUG_ON(0);
1772 }
1773}
1774
1775
1776/**
1777 * mei_cl_all_disconnect - disconnect forcefully all connected clients
1778 *
1779 * @dev: mei device
1780 */
1781void mei_cl_all_disconnect(struct mei_device *dev)
1782{
1783 struct mei_cl *cl;
1784
1785 list_for_each_entry(cl, &dev->file_list, link)
1786 mei_cl_set_disconnected(cl);
1787}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
4 * Intel Management Engine Interface (Intel MEI) Linux driver
5 */
6
7#include <linux/sched/signal.h>
8#include <linux/wait.h>
9#include <linux/delay.h>
10#include <linux/slab.h>
11#include <linux/pm_runtime.h>
12#include <linux/dma-mapping.h>
13
14#include <linux/mei.h>
15
16#include "mei_dev.h"
17#include "hbm.h"
18#include "client.h"
19
20/**
21 * mei_me_cl_init - initialize me client
22 *
23 * @me_cl: me client
24 */
25void mei_me_cl_init(struct mei_me_client *me_cl)
26{
27 INIT_LIST_HEAD(&me_cl->list);
28 kref_init(&me_cl->refcnt);
29}
30
31/**
32 * mei_me_cl_get - increases me client refcount
33 *
34 * @me_cl: me client
35 *
36 * Locking: called under "dev->device_lock" lock
37 *
38 * Return: me client or NULL
39 */
40struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl)
41{
42 if (me_cl && kref_get_unless_zero(&me_cl->refcnt))
43 return me_cl;
44
45 return NULL;
46}
47
48/**
49 * mei_me_cl_release - free me client
50 *
51 * Locking: called under "dev->device_lock" lock
52 *
53 * @ref: me_client refcount
54 */
55static void mei_me_cl_release(struct kref *ref)
56{
57 struct mei_me_client *me_cl =
58 container_of(ref, struct mei_me_client, refcnt);
59
60 kfree(me_cl);
61}
62
63/**
64 * mei_me_cl_put - decrease me client refcount and free client if necessary
65 *
66 * Locking: called under "dev->device_lock" lock
67 *
68 * @me_cl: me client
69 */
70void mei_me_cl_put(struct mei_me_client *me_cl)
71{
72 if (me_cl)
73 kref_put(&me_cl->refcnt, mei_me_cl_release);
74}
75
76/**
77 * __mei_me_cl_del - delete me client from the list and decrease
78 * reference counter
79 *
80 * @dev: mei device
81 * @me_cl: me client
82 *
83 * Locking: dev->me_clients_rwsem
84 */
85static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
86{
87 if (!me_cl)
88 return;
89
90 list_del_init(&me_cl->list);
91 mei_me_cl_put(me_cl);
92}
93
94/**
95 * mei_me_cl_del - delete me client from the list and decrease
96 * reference counter
97 *
98 * @dev: mei device
99 * @me_cl: me client
100 */
101void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
102{
103 down_write(&dev->me_clients_rwsem);
104 __mei_me_cl_del(dev, me_cl);
105 up_write(&dev->me_clients_rwsem);
106}
107
108/**
109 * mei_me_cl_add - add me client to the list
110 *
111 * @dev: mei device
112 * @me_cl: me client
113 */
114void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl)
115{
116 down_write(&dev->me_clients_rwsem);
117 list_add(&me_cl->list, &dev->me_clients);
118 up_write(&dev->me_clients_rwsem);
119}
120
121/**
122 * __mei_me_cl_by_uuid - locate me client by uuid
123 * increases ref count
124 *
125 * @dev: mei device
126 * @uuid: me client uuid
127 *
128 * Return: me client or NULL if not found
129 *
130 * Locking: dev->me_clients_rwsem
131 */
132static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev,
133 const uuid_le *uuid)
134{
135 struct mei_me_client *me_cl;
136 const uuid_le *pn;
137
138 WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
139
140 list_for_each_entry(me_cl, &dev->me_clients, list) {
141 pn = &me_cl->props.protocol_name;
142 if (uuid_le_cmp(*uuid, *pn) == 0)
143 return mei_me_cl_get(me_cl);
144 }
145
146 return NULL;
147}
148
149/**
150 * mei_me_cl_by_uuid - locate me client by uuid
151 * increases ref count
152 *
153 * @dev: mei device
154 * @uuid: me client uuid
155 *
156 * Return: me client or NULL if not found
157 *
158 * Locking: dev->me_clients_rwsem
159 */
160struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
161 const uuid_le *uuid)
162{
163 struct mei_me_client *me_cl;
164
165 down_read(&dev->me_clients_rwsem);
166 me_cl = __mei_me_cl_by_uuid(dev, uuid);
167 up_read(&dev->me_clients_rwsem);
168
169 return me_cl;
170}
171
172/**
173 * mei_me_cl_by_id - locate me client by client id
174 * increases ref count
175 *
176 * @dev: the device structure
177 * @client_id: me client id
178 *
179 * Return: me client or NULL if not found
180 *
181 * Locking: dev->me_clients_rwsem
182 */
183struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
184{
185
186 struct mei_me_client *__me_cl, *me_cl = NULL;
187
188 down_read(&dev->me_clients_rwsem);
189 list_for_each_entry(__me_cl, &dev->me_clients, list) {
190 if (__me_cl->client_id == client_id) {
191 me_cl = mei_me_cl_get(__me_cl);
192 break;
193 }
194 }
195 up_read(&dev->me_clients_rwsem);
196
197 return me_cl;
198}
199
200/**
201 * __mei_me_cl_by_uuid_id - locate me client by client id and uuid
202 * increases ref count
203 *
204 * @dev: the device structure
205 * @uuid: me client uuid
206 * @client_id: me client id
207 *
208 * Return: me client or null if not found
209 *
210 * Locking: dev->me_clients_rwsem
211 */
212static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev,
213 const uuid_le *uuid, u8 client_id)
214{
215 struct mei_me_client *me_cl;
216 const uuid_le *pn;
217
218 WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
219
220 list_for_each_entry(me_cl, &dev->me_clients, list) {
221 pn = &me_cl->props.protocol_name;
222 if (uuid_le_cmp(*uuid, *pn) == 0 &&
223 me_cl->client_id == client_id)
224 return mei_me_cl_get(me_cl);
225 }
226
227 return NULL;
228}
229
230
231/**
232 * mei_me_cl_by_uuid_id - locate me client by client id and uuid
233 * increases ref count
234 *
235 * @dev: the device structure
236 * @uuid: me client uuid
237 * @client_id: me client id
238 *
239 * Return: me client or null if not found
240 */
241struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
242 const uuid_le *uuid, u8 client_id)
243{
244 struct mei_me_client *me_cl;
245
246 down_read(&dev->me_clients_rwsem);
247 me_cl = __mei_me_cl_by_uuid_id(dev, uuid, client_id);
248 up_read(&dev->me_clients_rwsem);
249
250 return me_cl;
251}
252
253/**
254 * mei_me_cl_rm_by_uuid - remove all me clients matching uuid
255 *
256 * @dev: the device structure
257 * @uuid: me client uuid
258 *
259 * Locking: called under "dev->device_lock" lock
260 */
261void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
262{
263 struct mei_me_client *me_cl;
264
265 dev_dbg(dev->dev, "remove %pUl\n", uuid);
266
267 down_write(&dev->me_clients_rwsem);
268 me_cl = __mei_me_cl_by_uuid(dev, uuid);
269 __mei_me_cl_del(dev, me_cl);
270 mei_me_cl_put(me_cl);
271 up_write(&dev->me_clients_rwsem);
272}
273
274/**
275 * mei_me_cl_rm_by_uuid_id - remove all me clients matching client id
276 *
277 * @dev: the device structure
278 * @uuid: me client uuid
279 * @id: me client id
280 *
281 * Locking: called under "dev->device_lock" lock
282 */
283void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id)
284{
285 struct mei_me_client *me_cl;
286
287 dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id);
288
289 down_write(&dev->me_clients_rwsem);
290 me_cl = __mei_me_cl_by_uuid_id(dev, uuid, id);
291 __mei_me_cl_del(dev, me_cl);
292 mei_me_cl_put(me_cl);
293 up_write(&dev->me_clients_rwsem);
294}
295
296/**
297 * mei_me_cl_rm_all - remove all me clients
298 *
299 * @dev: the device structure
300 *
301 * Locking: called under "dev->device_lock" lock
302 */
303void mei_me_cl_rm_all(struct mei_device *dev)
304{
305 struct mei_me_client *me_cl, *next;
306
307 down_write(&dev->me_clients_rwsem);
308 list_for_each_entry_safe(me_cl, next, &dev->me_clients, list)
309 __mei_me_cl_del(dev, me_cl);
310 up_write(&dev->me_clients_rwsem);
311}
312
313/**
314 * mei_io_cb_free - free mei_cb_private related memory
315 *
316 * @cb: mei callback struct
317 */
318void mei_io_cb_free(struct mei_cl_cb *cb)
319{
320 if (cb == NULL)
321 return;
322
323 list_del(&cb->list);
324 kfree(cb->buf.data);
325 kfree(cb->ext_hdr);
326 kfree(cb);
327}
328
329/**
330 * mei_tx_cb_enqueue - queue tx callback
331 *
332 * Locking: called under "dev->device_lock" lock
333 *
334 * @cb: mei callback struct
335 * @head: an instance of list to queue on
336 */
337static inline void mei_tx_cb_enqueue(struct mei_cl_cb *cb,
338 struct list_head *head)
339{
340 list_add_tail(&cb->list, head);
341 cb->cl->tx_cb_queued++;
342}
343
344/**
345 * mei_tx_cb_dequeue - dequeue tx callback
346 *
347 * Locking: called under "dev->device_lock" lock
348 *
349 * @cb: mei callback struct to dequeue and free
350 */
351static inline void mei_tx_cb_dequeue(struct mei_cl_cb *cb)
352{
353 if (!WARN_ON(cb->cl->tx_cb_queued == 0))
354 cb->cl->tx_cb_queued--;
355
356 mei_io_cb_free(cb);
357}
358
359/**
360 * mei_cl_set_read_by_fp - set pending_read flag to vtag struct for given fp
361 *
362 * Locking: called under "dev->device_lock" lock
363 *
364 * @cl: mei client
365 * @fp: pointer to file structure
366 */
367static void mei_cl_set_read_by_fp(const struct mei_cl *cl,
368 const struct file *fp)
369{
370 struct mei_cl_vtag *cl_vtag;
371
372 list_for_each_entry(cl_vtag, &cl->vtag_map, list) {
373 if (cl_vtag->fp == fp) {
374 cl_vtag->pending_read = true;
375 return;
376 }
377 }
378}
379
380/**
381 * mei_io_cb_init - allocate and initialize io callback
382 *
383 * @cl: mei client
384 * @type: operation type
385 * @fp: pointer to file structure
386 *
387 * Return: mei_cl_cb pointer or NULL;
388 */
389static struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl,
390 enum mei_cb_file_ops type,
391 const struct file *fp)
392{
393 struct mei_cl_cb *cb;
394
395 cb = kzalloc(sizeof(*cb), GFP_KERNEL);
396 if (!cb)
397 return NULL;
398
399 INIT_LIST_HEAD(&cb->list);
400 cb->fp = fp;
401 cb->cl = cl;
402 cb->buf_idx = 0;
403 cb->fop_type = type;
404 cb->vtag = 0;
405 cb->ext_hdr = NULL;
406
407 return cb;
408}
409
410/**
411 * mei_io_list_flush_cl - removes cbs belonging to the cl.
412 *
413 * @head: an instance of our list structure
414 * @cl: host client
415 */
416static void mei_io_list_flush_cl(struct list_head *head,
417 const struct mei_cl *cl)
418{
419 struct mei_cl_cb *cb, *next;
420
421 list_for_each_entry_safe(cb, next, head, list) {
422 if (cl == cb->cl) {
423 list_del_init(&cb->list);
424 if (cb->fop_type == MEI_FOP_READ)
425 mei_io_cb_free(cb);
426 }
427 }
428}
429
430/**
431 * mei_io_tx_list_free_cl - removes cb belonging to the cl and free them
432 *
433 * @head: An instance of our list structure
434 * @cl: host client
435 * @fp: file pointer (matching cb file object), may be NULL
436 */
437static void mei_io_tx_list_free_cl(struct list_head *head,
438 const struct mei_cl *cl,
439 const struct file *fp)
440{
441 struct mei_cl_cb *cb, *next;
442
443 list_for_each_entry_safe(cb, next, head, list) {
444 if (cl == cb->cl && (!fp || fp == cb->fp))
445 mei_tx_cb_dequeue(cb);
446 }
447}
448
449/**
450 * mei_io_list_free_fp - free cb from a list that matches file pointer
451 *
452 * @head: io list
453 * @fp: file pointer (matching cb file object), may be NULL
454 */
455static void mei_io_list_free_fp(struct list_head *head, const struct file *fp)
456{
457 struct mei_cl_cb *cb, *next;
458
459 list_for_each_entry_safe(cb, next, head, list)
460 if (!fp || fp == cb->fp)
461 mei_io_cb_free(cb);
462}
463
464/**
465 * mei_cl_free_pending - free pending cb
466 *
467 * @cl: host client
468 */
469static void mei_cl_free_pending(struct mei_cl *cl)
470{
471 struct mei_cl_cb *cb;
472
473 cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
474 mei_io_cb_free(cb);
475}
476
477/**
478 * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
479 *
480 * @cl: host client
481 * @length: size of the buffer
482 * @fop_type: operation type
483 * @fp: associated file pointer (might be NULL)
484 *
485 * Return: cb on success and NULL on failure
486 */
487struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
488 enum mei_cb_file_ops fop_type,
489 const struct file *fp)
490{
491 struct mei_cl_cb *cb;
492
493 cb = mei_io_cb_init(cl, fop_type, fp);
494 if (!cb)
495 return NULL;
496
497 if (length == 0)
498 return cb;
499
500 cb->buf.data = kmalloc(roundup(length, MEI_SLOT_SIZE), GFP_KERNEL);
501 if (!cb->buf.data) {
502 mei_io_cb_free(cb);
503 return NULL;
504 }
505 cb->buf.size = length;
506
507 return cb;
508}
509
510/**
511 * mei_cl_enqueue_ctrl_wr_cb - a convenient wrapper for allocating
512 * and enqueuing of the control commands cb
513 *
514 * @cl: host client
515 * @length: size of the buffer
516 * @fop_type: operation type
517 * @fp: associated file pointer (might be NULL)
518 *
519 * Return: cb on success and NULL on failure
520 * Locking: called under "dev->device_lock" lock
521 */
522struct mei_cl_cb *mei_cl_enqueue_ctrl_wr_cb(struct mei_cl *cl, size_t length,
523 enum mei_cb_file_ops fop_type,
524 const struct file *fp)
525{
526 struct mei_cl_cb *cb;
527
528 /* for RX always allocate at least client's mtu */
529 if (length)
530 length = max_t(size_t, length, mei_cl_mtu(cl));
531
532 cb = mei_cl_alloc_cb(cl, length, fop_type, fp);
533 if (!cb)
534 return NULL;
535
536 list_add_tail(&cb->list, &cl->dev->ctrl_wr_list);
537 return cb;
538}
539
540/**
541 * mei_cl_read_cb - find this cl's callback in the read list
542 * for a specific file
543 *
544 * @cl: host client
545 * @fp: file pointer (matching cb file object), may be NULL
546 *
547 * Return: cb on success, NULL if cb is not found
548 */
549struct mei_cl_cb *mei_cl_read_cb(struct mei_cl *cl, const struct file *fp)
550{
551 struct mei_cl_cb *cb;
552 struct mei_cl_cb *ret_cb = NULL;
553
554 spin_lock(&cl->rd_completed_lock);
555 list_for_each_entry(cb, &cl->rd_completed, list)
556 if (!fp || fp == cb->fp) {
557 ret_cb = cb;
558 break;
559 }
560 spin_unlock(&cl->rd_completed_lock);
561 return ret_cb;
562}
563
564/**
565 * mei_cl_flush_queues - flushes queue lists belonging to cl.
566 *
567 * @cl: host client
568 * @fp: file pointer (matching cb file object), may be NULL
569 *
570 * Return: 0 on success, -EINVAL if cl or cl->dev is NULL.
571 */
572int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
573{
574 struct mei_device *dev;
575
576 if (WARN_ON(!cl || !cl->dev))
577 return -EINVAL;
578
579 dev = cl->dev;
580
581 cl_dbg(dev, cl, "remove list entry belonging to cl\n");
582 mei_io_tx_list_free_cl(&cl->dev->write_list, cl, fp);
583 mei_io_tx_list_free_cl(&cl->dev->write_waiting_list, cl, fp);
584 /* free pending and control cb only in final flush */
585 if (!fp) {
586 mei_io_list_flush_cl(&cl->dev->ctrl_wr_list, cl);
587 mei_io_list_flush_cl(&cl->dev->ctrl_rd_list, cl);
588 mei_cl_free_pending(cl);
589 }
590 spin_lock(&cl->rd_completed_lock);
591 mei_io_list_free_fp(&cl->rd_completed, fp);
592 spin_unlock(&cl->rd_completed_lock);
593
594 return 0;
595}
596
597/**
598 * mei_cl_init - initializes cl.
599 *
600 * @cl: host client to be initialized
601 * @dev: mei device
602 */
603static void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
604{
605 memset(cl, 0, sizeof(*cl));
606 init_waitqueue_head(&cl->wait);
607 init_waitqueue_head(&cl->rx_wait);
608 init_waitqueue_head(&cl->tx_wait);
609 init_waitqueue_head(&cl->ev_wait);
610 INIT_LIST_HEAD(&cl->vtag_map);
611 spin_lock_init(&cl->rd_completed_lock);
612 INIT_LIST_HEAD(&cl->rd_completed);
613 INIT_LIST_HEAD(&cl->rd_pending);
614 INIT_LIST_HEAD(&cl->link);
615 cl->writing_state = MEI_IDLE;
616 cl->state = MEI_FILE_UNINITIALIZED;
617 cl->dev = dev;
618}
619
620/**
621 * mei_cl_allocate - allocates cl structure and sets it up.
622 *
623 * @dev: mei device
624 * Return: The allocated file or NULL on failure
625 */
626struct mei_cl *mei_cl_allocate(struct mei_device *dev)
627{
628 struct mei_cl *cl;
629
630 cl = kmalloc(sizeof(*cl), GFP_KERNEL);
631 if (!cl)
632 return NULL;
633
634 mei_cl_init(cl, dev);
635
636 return cl;
637}
638
639/**
640 * mei_cl_link - allocate host id in the host map
641 *
642 * @cl: host client
643 *
644 * Return: 0 on success
645 * -EINVAL on incorrect values
646 * -EMFILE if open count exceeded.
647 */
648int mei_cl_link(struct mei_cl *cl)
649{
650 struct mei_device *dev;
651 int id;
652
653 if (WARN_ON(!cl || !cl->dev))
654 return -EINVAL;
655
656 dev = cl->dev;
657
658 id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX);
659 if (id >= MEI_CLIENTS_MAX) {
660 dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX);
661 return -EMFILE;
662 }
663
664 if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
665 dev_err(dev->dev, "open_handle_count exceeded %d",
666 MEI_MAX_OPEN_HANDLE_COUNT);
667 return -EMFILE;
668 }
669
670 dev->open_handle_count++;
671
672 cl->host_client_id = id;
673 list_add_tail(&cl->link, &dev->file_list);
674
675 set_bit(id, dev->host_clients_map);
676
677 cl->state = MEI_FILE_INITIALIZING;
678
679 cl_dbg(dev, cl, "link cl\n");
680 return 0;
681}
682
683/**
684 * mei_cl_unlink - remove host client from the list
685 *
686 * @cl: host client
687 *
688 * Return: always 0
689 */
690int mei_cl_unlink(struct mei_cl *cl)
691{
692 struct mei_device *dev;
693
694 /* don't shout on error exit path */
695 if (!cl)
696 return 0;
697
698 if (WARN_ON(!cl->dev))
699 return 0;
700
701 dev = cl->dev;
702
703 cl_dbg(dev, cl, "unlink client");
704
705 if (cl->state == MEI_FILE_UNINITIALIZED)
706 return 0;
707
708 if (dev->open_handle_count > 0)
709 dev->open_handle_count--;
710
711 /* never clear the 0 bit */
712 if (cl->host_client_id)
713 clear_bit(cl->host_client_id, dev->host_clients_map);
714
715 list_del_init(&cl->link);
716
717 cl->state = MEI_FILE_UNINITIALIZED;
718 cl->writing_state = MEI_IDLE;
719
720 WARN_ON(!list_empty(&cl->rd_completed) ||
721 !list_empty(&cl->rd_pending) ||
722 !list_empty(&cl->link));
723
724 return 0;
725}
726
727void mei_host_client_init(struct mei_device *dev)
728{
729 mei_set_devstate(dev, MEI_DEV_ENABLED);
730 dev->reset_count = 0;
731
732 schedule_work(&dev->bus_rescan_work);
733
734 pm_runtime_mark_last_busy(dev->dev);
735 dev_dbg(dev->dev, "rpm: autosuspend\n");
736 pm_request_autosuspend(dev->dev);
737}
738
739/**
740 * mei_hbuf_acquire - try to acquire host buffer
741 *
742 * @dev: the device structure
743 * Return: true if host buffer was acquired
744 */
745bool mei_hbuf_acquire(struct mei_device *dev)
746{
747 if (mei_pg_state(dev) == MEI_PG_ON ||
748 mei_pg_in_transition(dev)) {
749 dev_dbg(dev->dev, "device is in pg\n");
750 return false;
751 }
752
753 if (!dev->hbuf_is_ready) {
754 dev_dbg(dev->dev, "hbuf is not ready\n");
755 return false;
756 }
757
758 dev->hbuf_is_ready = false;
759
760 return true;
761}
762
763/**
764 * mei_cl_wake_all - wake up readers, writers and event waiters so
765 * they can be interrupted
766 *
767 * @cl: host client
768 */
769static void mei_cl_wake_all(struct mei_cl *cl)
770{
771 struct mei_device *dev = cl->dev;
772
773 /* synchronized under device mutex */
774 if (waitqueue_active(&cl->rx_wait)) {
775 cl_dbg(dev, cl, "Waking up reading client!\n");
776 wake_up_interruptible(&cl->rx_wait);
777 }
778 /* synchronized under device mutex */
779 if (waitqueue_active(&cl->tx_wait)) {
780 cl_dbg(dev, cl, "Waking up writing client!\n");
781 wake_up_interruptible(&cl->tx_wait);
782 }
783 /* synchronized under device mutex */
784 if (waitqueue_active(&cl->ev_wait)) {
785 cl_dbg(dev, cl, "Waking up waiting for event clients!\n");
786 wake_up_interruptible(&cl->ev_wait);
787 }
788 /* synchronized under device mutex */
789 if (waitqueue_active(&cl->wait)) {
790 cl_dbg(dev, cl, "Waking up ctrl write clients!\n");
791 wake_up(&cl->wait);
792 }
793}
794
795/**
796 * mei_cl_set_disconnected - set disconnected state and clear
797 * associated states and resources
798 *
799 * @cl: host client
800 */
801static void mei_cl_set_disconnected(struct mei_cl *cl)
802{
803 struct mei_device *dev = cl->dev;
804
805 if (cl->state == MEI_FILE_DISCONNECTED ||
806 cl->state <= MEI_FILE_INITIALIZING)
807 return;
808
809 cl->state = MEI_FILE_DISCONNECTED;
810 mei_io_tx_list_free_cl(&dev->write_list, cl, NULL);
811 mei_io_tx_list_free_cl(&dev->write_waiting_list, cl, NULL);
812 mei_io_list_flush_cl(&dev->ctrl_rd_list, cl);
813 mei_io_list_flush_cl(&dev->ctrl_wr_list, cl);
814 mei_cl_wake_all(cl);
815 cl->rx_flow_ctrl_creds = 0;
816 cl->tx_flow_ctrl_creds = 0;
817 cl->timer_count = 0;
818
819 if (!cl->me_cl)
820 return;
821
822 if (!WARN_ON(cl->me_cl->connect_count == 0))
823 cl->me_cl->connect_count--;
824
825 if (cl->me_cl->connect_count == 0)
826 cl->me_cl->tx_flow_ctrl_creds = 0;
827
828 mei_me_cl_put(cl->me_cl);
829 cl->me_cl = NULL;
830}
831
832static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl)
833{
834 if (!mei_me_cl_get(me_cl))
835 return -ENOENT;
836
837 /* only one connection is allowed for fixed address clients */
838 if (me_cl->props.fixed_address) {
839 if (me_cl->connect_count) {
840 mei_me_cl_put(me_cl);
841 return -EBUSY;
842 }
843 }
844
845 cl->me_cl = me_cl;
846 cl->state = MEI_FILE_CONNECTING;
847 cl->me_cl->connect_count++;
848
849 return 0;
850}
851
852/*
853 * mei_cl_send_disconnect - send disconnect request
854 *
855 * @cl: host client
856 * @cb: callback block
857 *
858 * Return: 0, OK; otherwise, error.
859 */
860static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb)
861{
862 struct mei_device *dev;
863 int ret;
864
865 dev = cl->dev;
866
867 ret = mei_hbm_cl_disconnect_req(dev, cl);
868 cl->status = ret;
869 if (ret) {
870 cl->state = MEI_FILE_DISCONNECT_REPLY;
871 return ret;
872 }
873
874 list_move_tail(&cb->list, &dev->ctrl_rd_list);
875 cl->timer_count = dev->timeouts.connect;
876 mei_schedule_stall_timer(dev);
877
878 return 0;
879}
880
881/**
882 * mei_cl_irq_disconnect - processes close related operation from
883 * interrupt thread context - send disconnect request
884 *
885 * @cl: client
886 * @cb: callback block.
887 * @cmpl_list: complete list.
888 *
889 * Return: 0, OK; otherwise, error.
890 */
891int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
892 struct list_head *cmpl_list)
893{
894 struct mei_device *dev = cl->dev;
895 u32 msg_slots;
896 int slots;
897 int ret;
898
899 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_request));
900 slots = mei_hbuf_empty_slots(dev);
901 if (slots < 0)
902 return -EOVERFLOW;
903
904 if ((u32)slots < msg_slots)
905 return -EMSGSIZE;
906
907 ret = mei_cl_send_disconnect(cl, cb);
908 if (ret)
909 list_move_tail(&cb->list, cmpl_list);
910
911 return ret;
912}
913
914/**
915 * __mei_cl_disconnect - disconnect host client from the me one
916 * internal function runtime pm has to be already acquired
917 *
918 * @cl: host client
919 *
920 * Return: 0 on success, <0 on failure.
921 */
922static int __mei_cl_disconnect(struct mei_cl *cl)
923{
924 struct mei_device *dev;
925 struct mei_cl_cb *cb;
926 int rets;
927
928 dev = cl->dev;
929
930 cl->state = MEI_FILE_DISCONNECTING;
931
932 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT, NULL);
933 if (!cb) {
934 rets = -ENOMEM;
935 goto out;
936 }
937
938 if (mei_hbuf_acquire(dev)) {
939 rets = mei_cl_send_disconnect(cl, cb);
940 if (rets) {
941 cl_err(dev, cl, "failed to disconnect.\n");
942 goto out;
943 }
944 }
945
946 mutex_unlock(&dev->device_lock);
947 wait_event_timeout(cl->wait,
948 cl->state == MEI_FILE_DISCONNECT_REPLY ||
949 cl->state == MEI_FILE_DISCONNECTED,
950 dev->timeouts.cl_connect);
951 mutex_lock(&dev->device_lock);
952
953 rets = cl->status;
954 if (cl->state != MEI_FILE_DISCONNECT_REPLY &&
955 cl->state != MEI_FILE_DISCONNECTED) {
956 cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
957 rets = -ETIME;
958 }
959
960out:
961 /* we disconnect also on error */
962 mei_cl_set_disconnected(cl);
963 if (!rets)
964 cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
965
966 mei_io_cb_free(cb);
967 return rets;
968}
969
970/**
971 * mei_cl_disconnect - disconnect host client from the me one
972 *
973 * @cl: host client
974 *
975 * Locking: called under "dev->device_lock" lock
976 *
977 * Return: 0 on success, <0 on failure.
978 */
979int mei_cl_disconnect(struct mei_cl *cl)
980{
981 struct mei_device *dev;
982 int rets;
983
984 if (WARN_ON(!cl || !cl->dev))
985 return -ENODEV;
986
987 dev = cl->dev;
988
989 cl_dbg(dev, cl, "disconnecting");
990
991 if (!mei_cl_is_connected(cl))
992 return 0;
993
994 if (mei_cl_is_fixed_address(cl)) {
995 mei_cl_set_disconnected(cl);
996 return 0;
997 }
998
999 if (dev->dev_state == MEI_DEV_POWERING_DOWN ||
1000 dev->dev_state == MEI_DEV_POWER_DOWN) {
1001 cl_dbg(dev, cl, "Device is powering down, don't bother with disconnection\n");
1002 mei_cl_set_disconnected(cl);
1003 return 0;
1004 }
1005
1006 rets = pm_runtime_get(dev->dev);
1007 if (rets < 0 && rets != -EINPROGRESS) {
1008 pm_runtime_put_noidle(dev->dev);
1009 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1010 return rets;
1011 }
1012
1013 rets = __mei_cl_disconnect(cl);
1014
1015 cl_dbg(dev, cl, "rpm: autosuspend\n");
1016 pm_runtime_mark_last_busy(dev->dev);
1017 pm_runtime_put_autosuspend(dev->dev);
1018
1019 return rets;
1020}
1021
1022
1023/**
1024 * mei_cl_is_other_connecting - checks if other
1025 * client with the same me client id is connecting
1026 *
1027 * @cl: private data of the file object
1028 *
1029 * Return: true if other client is connected, false - otherwise.
1030 */
1031static bool mei_cl_is_other_connecting(struct mei_cl *cl)
1032{
1033 struct mei_device *dev;
1034 struct mei_cl_cb *cb;
1035
1036 dev = cl->dev;
1037
1038 list_for_each_entry(cb, &dev->ctrl_rd_list, list) {
1039 if (cb->fop_type == MEI_FOP_CONNECT &&
1040 mei_cl_me_id(cl) == mei_cl_me_id(cb->cl))
1041 return true;
1042 }
1043
1044 return false;
1045}
1046
1047/**
1048 * mei_cl_send_connect - send connect request
1049 *
1050 * @cl: host client
1051 * @cb: callback block
1052 *
1053 * Return: 0, OK; otherwise, error.
1054 */
1055static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
1056{
1057 struct mei_device *dev;
1058 int ret;
1059
1060 dev = cl->dev;
1061
1062 ret = mei_hbm_cl_connect_req(dev, cl);
1063 cl->status = ret;
1064 if (ret) {
1065 cl->state = MEI_FILE_DISCONNECT_REPLY;
1066 return ret;
1067 }
1068
1069 list_move_tail(&cb->list, &dev->ctrl_rd_list);
1070 cl->timer_count = dev->timeouts.connect;
1071 mei_schedule_stall_timer(dev);
1072 return 0;
1073}
1074
1075/**
1076 * mei_cl_irq_connect - send connect request in irq_thread context
1077 *
1078 * @cl: host client
1079 * @cb: callback block
1080 * @cmpl_list: complete list
1081 *
1082 * Return: 0, OK; otherwise, error.
1083 */
1084int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
1085 struct list_head *cmpl_list)
1086{
1087 struct mei_device *dev = cl->dev;
1088 u32 msg_slots;
1089 int slots;
1090 int rets;
1091
1092 if (mei_cl_is_other_connecting(cl))
1093 return 0;
1094
1095 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_request));
1096 slots = mei_hbuf_empty_slots(dev);
1097 if (slots < 0)
1098 return -EOVERFLOW;
1099
1100 if ((u32)slots < msg_slots)
1101 return -EMSGSIZE;
1102
1103 rets = mei_cl_send_connect(cl, cb);
1104 if (rets)
1105 list_move_tail(&cb->list, cmpl_list);
1106
1107 return rets;
1108}
1109
1110/**
1111 * mei_cl_connect - connect host client to the me one
1112 *
1113 * @cl: host client
1114 * @me_cl: me client
1115 * @fp: pointer to file structure
1116 *
1117 * Locking: called under "dev->device_lock" lock
1118 *
1119 * Return: 0 on success, <0 on failure.
1120 */
1121int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
1122 const struct file *fp)
1123{
1124 struct mei_device *dev;
1125 struct mei_cl_cb *cb;
1126 int rets;
1127
1128 if (WARN_ON(!cl || !cl->dev || !me_cl))
1129 return -ENODEV;
1130
1131 dev = cl->dev;
1132
1133 rets = mei_cl_set_connecting(cl, me_cl);
1134 if (rets)
1135 goto nortpm;
1136
1137 if (mei_cl_is_fixed_address(cl)) {
1138 cl->state = MEI_FILE_CONNECTED;
1139 rets = 0;
1140 goto nortpm;
1141 }
1142
1143 rets = pm_runtime_get(dev->dev);
1144 if (rets < 0 && rets != -EINPROGRESS) {
1145 pm_runtime_put_noidle(dev->dev);
1146 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1147 goto nortpm;
1148 }
1149
1150 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_CONNECT, fp);
1151 if (!cb) {
1152 rets = -ENOMEM;
1153 goto out;
1154 }
1155
1156 /* run hbuf acquire last so we don't have to undo */
1157 if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
1158 rets = mei_cl_send_connect(cl, cb);
1159 if (rets)
1160 goto out;
1161 }
1162
1163 mutex_unlock(&dev->device_lock);
1164 wait_event_timeout(cl->wait,
1165 (cl->state == MEI_FILE_CONNECTED ||
1166 cl->state == MEI_FILE_DISCONNECTED ||
1167 cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
1168 cl->state == MEI_FILE_DISCONNECT_REPLY),
1169 dev->timeouts.cl_connect);
1170 mutex_lock(&dev->device_lock);
1171
1172 if (!mei_cl_is_connected(cl)) {
1173 if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) {
1174 mei_io_list_flush_cl(&dev->ctrl_rd_list, cl);
1175 mei_io_list_flush_cl(&dev->ctrl_wr_list, cl);
1176 /* ignore disconnect return valuue;
1177 * in case of failure reset will be invoked
1178 */
1179 __mei_cl_disconnect(cl);
1180 rets = -EFAULT;
1181 goto out;
1182 }
1183
1184 /* timeout or something went really wrong */
1185 if (!cl->status)
1186 cl->status = -EFAULT;
1187 }
1188
1189 rets = cl->status;
1190out:
1191 cl_dbg(dev, cl, "rpm: autosuspend\n");
1192 pm_runtime_mark_last_busy(dev->dev);
1193 pm_runtime_put_autosuspend(dev->dev);
1194
1195 mei_io_cb_free(cb);
1196
1197nortpm:
1198 if (!mei_cl_is_connected(cl))
1199 mei_cl_set_disconnected(cl);
1200
1201 return rets;
1202}
1203
1204/**
1205 * mei_cl_alloc_linked - allocate and link host client
1206 *
1207 * @dev: the device structure
1208 *
1209 * Return: cl on success ERR_PTR on failure
1210 */
1211struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev)
1212{
1213 struct mei_cl *cl;
1214 int ret;
1215
1216 cl = mei_cl_allocate(dev);
1217 if (!cl) {
1218 ret = -ENOMEM;
1219 goto err;
1220 }
1221
1222 ret = mei_cl_link(cl);
1223 if (ret)
1224 goto err;
1225
1226 return cl;
1227err:
1228 kfree(cl);
1229 return ERR_PTR(ret);
1230}
1231
1232/**
1233 * mei_cl_tx_flow_ctrl_creds - checks flow_control credits for cl.
1234 *
1235 * @cl: host client
1236 *
1237 * Return: 1 if tx_flow_ctrl_creds >0, 0 - otherwise.
1238 */
1239static int mei_cl_tx_flow_ctrl_creds(struct mei_cl *cl)
1240{
1241 if (WARN_ON(!cl || !cl->me_cl))
1242 return -EINVAL;
1243
1244 if (cl->tx_flow_ctrl_creds > 0)
1245 return 1;
1246
1247 if (mei_cl_is_fixed_address(cl))
1248 return 1;
1249
1250 if (mei_cl_is_single_recv_buf(cl)) {
1251 if (cl->me_cl->tx_flow_ctrl_creds > 0)
1252 return 1;
1253 }
1254 return 0;
1255}
1256
1257/**
1258 * mei_cl_tx_flow_ctrl_creds_reduce - reduces transmit flow control credits
1259 * for a client
1260 *
1261 * @cl: host client
1262 *
1263 * Return:
1264 * 0 on success
1265 * -EINVAL when ctrl credits are <= 0
1266 */
1267static int mei_cl_tx_flow_ctrl_creds_reduce(struct mei_cl *cl)
1268{
1269 if (WARN_ON(!cl || !cl->me_cl))
1270 return -EINVAL;
1271
1272 if (mei_cl_is_fixed_address(cl))
1273 return 0;
1274
1275 if (mei_cl_is_single_recv_buf(cl)) {
1276 if (WARN_ON(cl->me_cl->tx_flow_ctrl_creds <= 0))
1277 return -EINVAL;
1278 cl->me_cl->tx_flow_ctrl_creds--;
1279 } else {
1280 if (WARN_ON(cl->tx_flow_ctrl_creds <= 0))
1281 return -EINVAL;
1282 cl->tx_flow_ctrl_creds--;
1283 }
1284 return 0;
1285}
1286
1287/**
1288 * mei_cl_vtag_alloc - allocate and fill the vtag structure
1289 *
1290 * @fp: pointer to file structure
1291 * @vtag: vm tag
1292 *
1293 * Return:
1294 * * Pointer to allocated struct - on success
1295 * * ERR_PTR(-ENOMEM) on memory allocation failure
1296 */
1297struct mei_cl_vtag *mei_cl_vtag_alloc(struct file *fp, u8 vtag)
1298{
1299 struct mei_cl_vtag *cl_vtag;
1300
1301 cl_vtag = kzalloc(sizeof(*cl_vtag), GFP_KERNEL);
1302 if (!cl_vtag)
1303 return ERR_PTR(-ENOMEM);
1304
1305 INIT_LIST_HEAD(&cl_vtag->list);
1306 cl_vtag->vtag = vtag;
1307 cl_vtag->fp = fp;
1308
1309 return cl_vtag;
1310}
1311
1312/**
1313 * mei_cl_fp_by_vtag - obtain the file pointer by vtag
1314 *
1315 * @cl: host client
1316 * @vtag: virtual tag
1317 *
1318 * Return:
1319 * * A file pointer - on success
1320 * * ERR_PTR(-ENOENT) if vtag is not found in the client vtag list
1321 */
1322const struct file *mei_cl_fp_by_vtag(const struct mei_cl *cl, u8 vtag)
1323{
1324 struct mei_cl_vtag *vtag_l;
1325
1326 list_for_each_entry(vtag_l, &cl->vtag_map, list)
1327 /* The client on bus has one fixed fp */
1328 if ((cl->cldev && mei_cldev_enabled(cl->cldev)) ||
1329 vtag_l->vtag == vtag)
1330 return vtag_l->fp;
1331
1332 return ERR_PTR(-ENOENT);
1333}
1334
1335/**
1336 * mei_cl_reset_read_by_vtag - reset pending_read flag by given vtag
1337 *
1338 * @cl: host client
1339 * @vtag: vm tag
1340 */
1341static void mei_cl_reset_read_by_vtag(const struct mei_cl *cl, u8 vtag)
1342{
1343 struct mei_cl_vtag *vtag_l;
1344
1345 list_for_each_entry(vtag_l, &cl->vtag_map, list) {
1346 if (vtag_l->vtag == vtag) {
1347 vtag_l->pending_read = false;
1348 break;
1349 }
1350 }
1351}
1352
1353/**
1354 * mei_cl_read_vtag_add_fc - add flow control for next pending reader
1355 * in the vtag list
1356 *
1357 * @cl: host client
1358 */
1359static void mei_cl_read_vtag_add_fc(struct mei_cl *cl)
1360{
1361 struct mei_cl_vtag *cl_vtag;
1362
1363 list_for_each_entry(cl_vtag, &cl->vtag_map, list) {
1364 if (cl_vtag->pending_read) {
1365 if (mei_cl_enqueue_ctrl_wr_cb(cl,
1366 mei_cl_mtu(cl),
1367 MEI_FOP_READ,
1368 cl_vtag->fp))
1369 cl->rx_flow_ctrl_creds++;
1370 break;
1371 }
1372 }
1373}
1374
1375/**
1376 * mei_cl_vt_support_check - check if client support vtags
1377 *
1378 * @cl: host client
1379 *
1380 * Return:
1381 * * 0 - supported, or not connected at all
1382 * * -EOPNOTSUPP - vtags are not supported by client
1383 */
1384int mei_cl_vt_support_check(const struct mei_cl *cl)
1385{
1386 struct mei_device *dev = cl->dev;
1387
1388 if (!dev->hbm_f_vt_supported)
1389 return -EOPNOTSUPP;
1390
1391 if (!cl->me_cl)
1392 return 0;
1393
1394 return cl->me_cl->props.vt_supported ? 0 : -EOPNOTSUPP;
1395}
1396
1397/**
1398 * mei_cl_add_rd_completed - add read completed callback to list with lock
1399 * and vtag check
1400 *
1401 * @cl: host client
1402 * @cb: callback block
1403 *
1404 */
1405void mei_cl_add_rd_completed(struct mei_cl *cl, struct mei_cl_cb *cb)
1406{
1407 const struct file *fp;
1408
1409 if (!mei_cl_vt_support_check(cl)) {
1410 fp = mei_cl_fp_by_vtag(cl, cb->vtag);
1411 if (IS_ERR(fp)) {
1412 /* client already disconnected, discarding */
1413 mei_io_cb_free(cb);
1414 return;
1415 }
1416 cb->fp = fp;
1417 mei_cl_reset_read_by_vtag(cl, cb->vtag);
1418 mei_cl_read_vtag_add_fc(cl);
1419 }
1420
1421 spin_lock(&cl->rd_completed_lock);
1422 list_add_tail(&cb->list, &cl->rd_completed);
1423 spin_unlock(&cl->rd_completed_lock);
1424}
1425
1426/**
1427 * mei_cl_del_rd_completed - free read completed callback with lock
1428 *
1429 * @cl: host client
1430 * @cb: callback block
1431 *
1432 */
1433void mei_cl_del_rd_completed(struct mei_cl *cl, struct mei_cl_cb *cb)
1434{
1435 spin_lock(&cl->rd_completed_lock);
1436 mei_io_cb_free(cb);
1437 spin_unlock(&cl->rd_completed_lock);
1438}
1439
1440/**
1441 * mei_cl_notify_fop2req - convert fop to proper request
1442 *
1443 * @fop: client notification start response command
1444 *
1445 * Return: MEI_HBM_NOTIFICATION_START/STOP
1446 */
1447u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop)
1448{
1449 if (fop == MEI_FOP_NOTIFY_START)
1450 return MEI_HBM_NOTIFICATION_START;
1451 else
1452 return MEI_HBM_NOTIFICATION_STOP;
1453}
1454
1455/**
1456 * mei_cl_notify_req2fop - convert notification request top file operation type
1457 *
1458 * @req: hbm notification request type
1459 *
1460 * Return: MEI_FOP_NOTIFY_START/STOP
1461 */
1462enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req)
1463{
1464 if (req == MEI_HBM_NOTIFICATION_START)
1465 return MEI_FOP_NOTIFY_START;
1466 else
1467 return MEI_FOP_NOTIFY_STOP;
1468}
1469
1470/**
1471 * mei_cl_irq_notify - send notification request in irq_thread context
1472 *
1473 * @cl: client
1474 * @cb: callback block.
1475 * @cmpl_list: complete list.
1476 *
1477 * Return: 0 on such and error otherwise.
1478 */
1479int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb,
1480 struct list_head *cmpl_list)
1481{
1482 struct mei_device *dev = cl->dev;
1483 u32 msg_slots;
1484 int slots;
1485 int ret;
1486 bool request;
1487
1488 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_request));
1489 slots = mei_hbuf_empty_slots(dev);
1490 if (slots < 0)
1491 return -EOVERFLOW;
1492
1493 if ((u32)slots < msg_slots)
1494 return -EMSGSIZE;
1495
1496 request = mei_cl_notify_fop2req(cb->fop_type);
1497 ret = mei_hbm_cl_notify_req(dev, cl, request);
1498 if (ret) {
1499 cl->status = ret;
1500 list_move_tail(&cb->list, cmpl_list);
1501 return ret;
1502 }
1503
1504 list_move_tail(&cb->list, &dev->ctrl_rd_list);
1505 return 0;
1506}
1507
1508/**
1509 * mei_cl_notify_request - send notification stop/start request
1510 *
1511 * @cl: host client
1512 * @fp: associate request with file
1513 * @request: 1 for start or 0 for stop
1514 *
1515 * Locking: called under "dev->device_lock" lock
1516 *
1517 * Return: 0 on such and error otherwise.
1518 */
1519int mei_cl_notify_request(struct mei_cl *cl,
1520 const struct file *fp, u8 request)
1521{
1522 struct mei_device *dev;
1523 struct mei_cl_cb *cb;
1524 enum mei_cb_file_ops fop_type;
1525 int rets;
1526
1527 if (WARN_ON(!cl || !cl->dev))
1528 return -ENODEV;
1529
1530 dev = cl->dev;
1531
1532 if (!dev->hbm_f_ev_supported) {
1533 cl_dbg(dev, cl, "notifications not supported\n");
1534 return -EOPNOTSUPP;
1535 }
1536
1537 if (!mei_cl_is_connected(cl))
1538 return -ENODEV;
1539
1540 rets = pm_runtime_get(dev->dev);
1541 if (rets < 0 && rets != -EINPROGRESS) {
1542 pm_runtime_put_noidle(dev->dev);
1543 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1544 return rets;
1545 }
1546
1547 fop_type = mei_cl_notify_req2fop(request);
1548 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, fop_type, fp);
1549 if (!cb) {
1550 rets = -ENOMEM;
1551 goto out;
1552 }
1553
1554 if (mei_hbuf_acquire(dev)) {
1555 if (mei_hbm_cl_notify_req(dev, cl, request)) {
1556 rets = -ENODEV;
1557 goto out;
1558 }
1559 list_move_tail(&cb->list, &dev->ctrl_rd_list);
1560 }
1561
1562 mutex_unlock(&dev->device_lock);
1563 wait_event_timeout(cl->wait,
1564 cl->notify_en == request ||
1565 cl->status ||
1566 !mei_cl_is_connected(cl),
1567 dev->timeouts.cl_connect);
1568 mutex_lock(&dev->device_lock);
1569
1570 if (cl->notify_en != request && !cl->status)
1571 cl->status = -EFAULT;
1572
1573 rets = cl->status;
1574
1575out:
1576 cl_dbg(dev, cl, "rpm: autosuspend\n");
1577 pm_runtime_mark_last_busy(dev->dev);
1578 pm_runtime_put_autosuspend(dev->dev);
1579
1580 mei_io_cb_free(cb);
1581 return rets;
1582}
1583
1584/**
1585 * mei_cl_notify - raise notification
1586 *
1587 * @cl: host client
1588 *
1589 * Locking: called under "dev->device_lock" lock
1590 */
1591void mei_cl_notify(struct mei_cl *cl)
1592{
1593 struct mei_device *dev;
1594
1595 if (!cl || !cl->dev)
1596 return;
1597
1598 dev = cl->dev;
1599
1600 if (!cl->notify_en)
1601 return;
1602
1603 cl_dbg(dev, cl, "notify event");
1604 cl->notify_ev = true;
1605 if (!mei_cl_bus_notify_event(cl))
1606 wake_up_interruptible(&cl->ev_wait);
1607
1608 if (cl->ev_async)
1609 kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);
1610
1611}
1612
1613/**
1614 * mei_cl_notify_get - get or wait for notification event
1615 *
1616 * @cl: host client
1617 * @block: this request is blocking
1618 * @notify_ev: true if notification event was received
1619 *
1620 * Locking: called under "dev->device_lock" lock
1621 *
1622 * Return: 0 on such and error otherwise.
1623 */
1624int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev)
1625{
1626 struct mei_device *dev;
1627 int rets;
1628
1629 *notify_ev = false;
1630
1631 if (WARN_ON(!cl || !cl->dev))
1632 return -ENODEV;
1633
1634 dev = cl->dev;
1635
1636 if (!dev->hbm_f_ev_supported) {
1637 cl_dbg(dev, cl, "notifications not supported\n");
1638 return -EOPNOTSUPP;
1639 }
1640
1641 if (!mei_cl_is_connected(cl))
1642 return -ENODEV;
1643
1644 if (cl->notify_ev)
1645 goto out;
1646
1647 if (!block)
1648 return -EAGAIN;
1649
1650 mutex_unlock(&dev->device_lock);
1651 rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev);
1652 mutex_lock(&dev->device_lock);
1653
1654 if (rets < 0)
1655 return rets;
1656
1657out:
1658 *notify_ev = cl->notify_ev;
1659 cl->notify_ev = false;
1660 return 0;
1661}
1662
1663/**
1664 * mei_cl_read_start - the start read client message function.
1665 *
1666 * @cl: host client
1667 * @length: number of bytes to read
1668 * @fp: pointer to file structure
1669 *
1670 * Return: 0 on success, <0 on failure.
1671 */
1672int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp)
1673{
1674 struct mei_device *dev;
1675 struct mei_cl_cb *cb;
1676 int rets;
1677
1678 if (WARN_ON(!cl || !cl->dev))
1679 return -ENODEV;
1680
1681 dev = cl->dev;
1682
1683 if (!mei_cl_is_connected(cl))
1684 return -ENODEV;
1685
1686 if (!mei_me_cl_is_active(cl->me_cl)) {
1687 cl_err(dev, cl, "no such me client\n");
1688 return -ENOTTY;
1689 }
1690
1691 if (mei_cl_is_fixed_address(cl))
1692 return 0;
1693
1694 /* HW currently supports only one pending read */
1695 if (cl->rx_flow_ctrl_creds) {
1696 mei_cl_set_read_by_fp(cl, fp);
1697 return -EBUSY;
1698 }
1699
1700 cb = mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, fp);
1701 if (!cb)
1702 return -ENOMEM;
1703
1704 mei_cl_set_read_by_fp(cl, fp);
1705
1706 rets = pm_runtime_get(dev->dev);
1707 if (rets < 0 && rets != -EINPROGRESS) {
1708 pm_runtime_put_noidle(dev->dev);
1709 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1710 goto nortpm;
1711 }
1712
1713 rets = 0;
1714 if (mei_hbuf_acquire(dev)) {
1715 rets = mei_hbm_cl_flow_control_req(dev, cl);
1716 if (rets < 0)
1717 goto out;
1718
1719 list_move_tail(&cb->list, &cl->rd_pending);
1720 }
1721 cl->rx_flow_ctrl_creds++;
1722
1723out:
1724 cl_dbg(dev, cl, "rpm: autosuspend\n");
1725 pm_runtime_mark_last_busy(dev->dev);
1726 pm_runtime_put_autosuspend(dev->dev);
1727nortpm:
1728 if (rets)
1729 mei_io_cb_free(cb);
1730
1731 return rets;
1732}
1733
1734static inline u8 mei_ext_hdr_set_vtag(void *ext, u8 vtag)
1735{
1736 struct mei_ext_hdr_vtag *vtag_hdr = ext;
1737
1738 vtag_hdr->hdr.type = MEI_EXT_HDR_VTAG;
1739 vtag_hdr->hdr.length = mei_data2slots(sizeof(*vtag_hdr));
1740 vtag_hdr->vtag = vtag;
1741 vtag_hdr->reserved = 0;
1742 return vtag_hdr->hdr.length;
1743}
1744
1745static inline bool mei_ext_hdr_is_gsc(struct mei_ext_hdr *ext)
1746{
1747 return ext && ext->type == MEI_EXT_HDR_GSC;
1748}
1749
1750static inline u8 mei_ext_hdr_set_gsc(struct mei_ext_hdr *ext, struct mei_ext_hdr *gsc_hdr)
1751{
1752 memcpy(ext, gsc_hdr, mei_ext_hdr_len(gsc_hdr));
1753 return ext->length;
1754}
1755
1756/**
1757 * mei_msg_hdr_init - allocate and initialize mei message header
1758 *
1759 * @cb: message callback structure
1760 *
1761 * Return: a pointer to initialized header or ERR_PTR on failure
1762 */
1763static struct mei_msg_hdr *mei_msg_hdr_init(const struct mei_cl_cb *cb)
1764{
1765 size_t hdr_len;
1766 struct mei_ext_meta_hdr *meta;
1767 struct mei_msg_hdr *mei_hdr;
1768 bool is_ext, is_hbm, is_gsc, is_vtag;
1769 struct mei_ext_hdr *next_ext;
1770
1771 if (!cb)
1772 return ERR_PTR(-EINVAL);
1773
1774 /* Extended header for vtag is attached only on the first fragment */
1775 is_vtag = (cb->vtag && cb->buf_idx == 0);
1776 is_hbm = cb->cl->me_cl->client_id == 0;
1777 is_gsc = ((!is_hbm) && cb->cl->dev->hbm_f_gsc_supported && mei_ext_hdr_is_gsc(cb->ext_hdr));
1778 is_ext = is_vtag || is_gsc;
1779
1780 /* Compute extended header size */
1781 hdr_len = sizeof(*mei_hdr);
1782
1783 if (!is_ext)
1784 goto setup_hdr;
1785
1786 hdr_len += sizeof(*meta);
1787 if (is_vtag)
1788 hdr_len += sizeof(struct mei_ext_hdr_vtag);
1789
1790 if (is_gsc)
1791 hdr_len += mei_ext_hdr_len(cb->ext_hdr);
1792
1793setup_hdr:
1794 mei_hdr = kzalloc(hdr_len, GFP_KERNEL);
1795 if (!mei_hdr)
1796 return ERR_PTR(-ENOMEM);
1797
1798 mei_hdr->host_addr = mei_cl_host_addr(cb->cl);
1799 mei_hdr->me_addr = mei_cl_me_id(cb->cl);
1800 mei_hdr->internal = cb->internal;
1801 mei_hdr->extended = is_ext;
1802
1803 if (!is_ext)
1804 goto out;
1805
1806 meta = (struct mei_ext_meta_hdr *)mei_hdr->extension;
1807 meta->size = 0;
1808 next_ext = (struct mei_ext_hdr *)meta->hdrs;
1809 if (is_vtag) {
1810 meta->count++;
1811 meta->size += mei_ext_hdr_set_vtag(next_ext, cb->vtag);
1812 next_ext = mei_ext_next(next_ext);
1813 }
1814
1815 if (is_gsc) {
1816 meta->count++;
1817 meta->size += mei_ext_hdr_set_gsc(next_ext, cb->ext_hdr);
1818 next_ext = mei_ext_next(next_ext);
1819 }
1820
1821out:
1822 mei_hdr->length = hdr_len - sizeof(*mei_hdr);
1823 return mei_hdr;
1824}
1825
1826/**
1827 * mei_cl_irq_write - write a message to device
1828 * from the interrupt thread context
1829 *
1830 * @cl: client
1831 * @cb: callback block.
1832 * @cmpl_list: complete list.
1833 *
1834 * Return: 0, OK; otherwise error.
1835 */
1836int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
1837 struct list_head *cmpl_list)
1838{
1839 struct mei_device *dev;
1840 struct mei_msg_data *buf;
1841 struct mei_msg_hdr *mei_hdr = NULL;
1842 size_t hdr_len;
1843 size_t hbuf_len, dr_len;
1844 size_t buf_len = 0;
1845 size_t data_len;
1846 int hbuf_slots;
1847 u32 dr_slots;
1848 u32 dma_len;
1849 int rets;
1850 bool first_chunk;
1851 const void *data = NULL;
1852
1853 if (WARN_ON(!cl || !cl->dev))
1854 return -ENODEV;
1855
1856 dev = cl->dev;
1857
1858 buf = &cb->buf;
1859
1860 first_chunk = cb->buf_idx == 0;
1861
1862 rets = first_chunk ? mei_cl_tx_flow_ctrl_creds(cl) : 1;
1863 if (rets < 0)
1864 goto err;
1865
1866 if (rets == 0) {
1867 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1868 return 0;
1869 }
1870
1871 if (buf->data) {
1872 buf_len = buf->size - cb->buf_idx;
1873 data = buf->data + cb->buf_idx;
1874 }
1875 hbuf_slots = mei_hbuf_empty_slots(dev);
1876 if (hbuf_slots < 0) {
1877 rets = -EOVERFLOW;
1878 goto err;
1879 }
1880
1881 hbuf_len = mei_slots2data(hbuf_slots) & MEI_MSG_MAX_LEN_MASK;
1882 dr_slots = mei_dma_ring_empty_slots(dev);
1883 dr_len = mei_slots2data(dr_slots);
1884
1885 mei_hdr = mei_msg_hdr_init(cb);
1886 if (IS_ERR(mei_hdr)) {
1887 rets = PTR_ERR(mei_hdr);
1888 mei_hdr = NULL;
1889 goto err;
1890 }
1891
1892 hdr_len = sizeof(*mei_hdr) + mei_hdr->length;
1893
1894 /**
1895 * Split the message only if we can write the whole host buffer
1896 * otherwise wait for next time the host buffer is empty.
1897 */
1898 if (hdr_len + buf_len <= hbuf_len) {
1899 data_len = buf_len;
1900 mei_hdr->msg_complete = 1;
1901 } else if (dr_slots && hbuf_len >= hdr_len + sizeof(dma_len)) {
1902 mei_hdr->dma_ring = 1;
1903 if (buf_len > dr_len)
1904 buf_len = dr_len;
1905 else
1906 mei_hdr->msg_complete = 1;
1907
1908 data_len = sizeof(dma_len);
1909 dma_len = buf_len;
1910 data = &dma_len;
1911 } else if ((u32)hbuf_slots == mei_hbuf_depth(dev)) {
1912 buf_len = hbuf_len - hdr_len;
1913 data_len = buf_len;
1914 } else {
1915 kfree(mei_hdr);
1916 return 0;
1917 }
1918 mei_hdr->length += data_len;
1919
1920 if (mei_hdr->dma_ring && buf->data)
1921 mei_dma_ring_write(dev, buf->data + cb->buf_idx, buf_len);
1922 rets = mei_write_message(dev, mei_hdr, hdr_len, data, data_len);
1923
1924 if (rets)
1925 goto err;
1926
1927 cl->status = 0;
1928 cl->writing_state = MEI_WRITING;
1929 cb->buf_idx += buf_len;
1930
1931 if (first_chunk) {
1932 if (mei_cl_tx_flow_ctrl_creds_reduce(cl)) {
1933 rets = -EIO;
1934 goto err;
1935 }
1936 }
1937
1938 if (mei_hdr->msg_complete)
1939 list_move_tail(&cb->list, &dev->write_waiting_list);
1940
1941 kfree(mei_hdr);
1942 return 0;
1943
1944err:
1945 kfree(mei_hdr);
1946 cl->status = rets;
1947 list_move_tail(&cb->list, cmpl_list);
1948 return rets;
1949}
1950
1951/**
1952 * mei_cl_write - submit a write cb to mei device
1953 * assumes device_lock is locked
1954 *
1955 * @cl: host client
1956 * @cb: write callback with filled data
1957 * @timeout: send timeout in milliseconds.
1958 * effective only for blocking writes: the cb->blocking is set.
1959 * set timeout to the MAX_SCHEDULE_TIMEOUT to maixum allowed wait.
1960 *
1961 * Return: number of bytes sent on success, <0 on failure.
1962 */
1963ssize_t mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, unsigned long timeout)
1964{
1965 struct mei_device *dev;
1966 struct mei_msg_data *buf;
1967 struct mei_msg_hdr *mei_hdr = NULL;
1968 size_t hdr_len;
1969 size_t hbuf_len, dr_len;
1970 size_t buf_len;
1971 size_t data_len;
1972 int hbuf_slots;
1973 u32 dr_slots;
1974 u32 dma_len;
1975 ssize_t rets;
1976 bool blocking;
1977 const void *data;
1978
1979 if (WARN_ON(!cl || !cl->dev))
1980 return -ENODEV;
1981
1982 if (WARN_ON(!cb))
1983 return -EINVAL;
1984
1985 dev = cl->dev;
1986
1987 buf = &cb->buf;
1988 buf_len = buf->size;
1989
1990 cl_dbg(dev, cl, "buf_len=%zd\n", buf_len);
1991
1992 blocking = cb->blocking;
1993 data = buf->data;
1994
1995 rets = pm_runtime_get(dev->dev);
1996 if (rets < 0 && rets != -EINPROGRESS) {
1997 pm_runtime_put_noidle(dev->dev);
1998 cl_err(dev, cl, "rpm: get failed %zd\n", rets);
1999 goto free;
2000 }
2001
2002 cb->buf_idx = 0;
2003 cl->writing_state = MEI_IDLE;
2004
2005
2006 rets = mei_cl_tx_flow_ctrl_creds(cl);
2007 if (rets < 0)
2008 goto err;
2009
2010 mei_hdr = mei_msg_hdr_init(cb);
2011 if (IS_ERR(mei_hdr)) {
2012 rets = -PTR_ERR(mei_hdr);
2013 mei_hdr = NULL;
2014 goto err;
2015 }
2016
2017 hdr_len = sizeof(*mei_hdr) + mei_hdr->length;
2018
2019 if (rets == 0) {
2020 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
2021 rets = buf_len;
2022 goto out;
2023 }
2024
2025 if (!mei_hbuf_acquire(dev)) {
2026 cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
2027 rets = buf_len;
2028 goto out;
2029 }
2030
2031 hbuf_slots = mei_hbuf_empty_slots(dev);
2032 if (hbuf_slots < 0) {
2033 rets = -EOVERFLOW;
2034 goto out;
2035 }
2036
2037 hbuf_len = mei_slots2data(hbuf_slots) & MEI_MSG_MAX_LEN_MASK;
2038 dr_slots = mei_dma_ring_empty_slots(dev);
2039 dr_len = mei_slots2data(dr_slots);
2040
2041 if (hdr_len + buf_len <= hbuf_len) {
2042 data_len = buf_len;
2043 mei_hdr->msg_complete = 1;
2044 } else if (dr_slots && hbuf_len >= hdr_len + sizeof(dma_len)) {
2045 mei_hdr->dma_ring = 1;
2046 if (buf_len > dr_len)
2047 buf_len = dr_len;
2048 else
2049 mei_hdr->msg_complete = 1;
2050
2051 data_len = sizeof(dma_len);
2052 dma_len = buf_len;
2053 data = &dma_len;
2054 } else {
2055 buf_len = hbuf_len - hdr_len;
2056 data_len = buf_len;
2057 }
2058
2059 mei_hdr->length += data_len;
2060
2061 if (mei_hdr->dma_ring && buf->data)
2062 mei_dma_ring_write(dev, buf->data, buf_len);
2063 rets = mei_write_message(dev, mei_hdr, hdr_len, data, data_len);
2064
2065 if (rets)
2066 goto err;
2067
2068 rets = mei_cl_tx_flow_ctrl_creds_reduce(cl);
2069 if (rets)
2070 goto err;
2071
2072 cl->writing_state = MEI_WRITING;
2073 cb->buf_idx = buf_len;
2074 /* restore return value */
2075 buf_len = buf->size;
2076
2077out:
2078 if (mei_hdr->msg_complete)
2079 mei_tx_cb_enqueue(cb, &dev->write_waiting_list);
2080 else
2081 mei_tx_cb_enqueue(cb, &dev->write_list);
2082
2083 cb = NULL;
2084 if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
2085
2086 mutex_unlock(&dev->device_lock);
2087 rets = wait_event_interruptible_timeout(cl->tx_wait,
2088 cl->writing_state == MEI_WRITE_COMPLETE ||
2089 (!mei_cl_is_connected(cl)),
2090 msecs_to_jiffies(timeout));
2091 mutex_lock(&dev->device_lock);
2092 /* clean all queue on timeout as something fatal happened */
2093 if (rets == 0) {
2094 rets = -ETIME;
2095 mei_io_tx_list_free_cl(&dev->write_list, cl, NULL);
2096 mei_io_tx_list_free_cl(&dev->write_waiting_list, cl, NULL);
2097 }
2098 /* wait_event_interruptible returns -ERESTARTSYS */
2099 if (rets > 0)
2100 rets = 0;
2101 if (rets) {
2102 if (signal_pending(current))
2103 rets = -EINTR;
2104 goto err;
2105 }
2106 if (cl->writing_state != MEI_WRITE_COMPLETE) {
2107 rets = -EFAULT;
2108 goto err;
2109 }
2110 }
2111
2112 rets = buf_len;
2113err:
2114 cl_dbg(dev, cl, "rpm: autosuspend\n");
2115 pm_runtime_mark_last_busy(dev->dev);
2116 pm_runtime_put_autosuspend(dev->dev);
2117free:
2118 mei_io_cb_free(cb);
2119
2120 kfree(mei_hdr);
2121
2122 return rets;
2123}
2124
2125/**
2126 * mei_cl_complete - processes completed operation for a client
2127 *
2128 * @cl: private data of the file object.
2129 * @cb: callback block.
2130 */
2131void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
2132{
2133 struct mei_device *dev = cl->dev;
2134
2135 switch (cb->fop_type) {
2136 case MEI_FOP_WRITE:
2137 mei_tx_cb_dequeue(cb);
2138 cl->writing_state = MEI_WRITE_COMPLETE;
2139 if (waitqueue_active(&cl->tx_wait)) {
2140 wake_up_interruptible(&cl->tx_wait);
2141 } else {
2142 pm_runtime_mark_last_busy(dev->dev);
2143 pm_request_autosuspend(dev->dev);
2144 }
2145 break;
2146
2147 case MEI_FOP_READ:
2148 mei_cl_add_rd_completed(cl, cb);
2149 if (!mei_cl_is_fixed_address(cl) &&
2150 !WARN_ON(!cl->rx_flow_ctrl_creds))
2151 cl->rx_flow_ctrl_creds--;
2152 if (!mei_cl_bus_rx_event(cl))
2153 wake_up_interruptible(&cl->rx_wait);
2154 break;
2155
2156 case MEI_FOP_CONNECT:
2157 case MEI_FOP_DISCONNECT:
2158 case MEI_FOP_NOTIFY_STOP:
2159 case MEI_FOP_NOTIFY_START:
2160 case MEI_FOP_DMA_MAP:
2161 case MEI_FOP_DMA_UNMAP:
2162 if (waitqueue_active(&cl->wait))
2163 wake_up(&cl->wait);
2164
2165 break;
2166 case MEI_FOP_DISCONNECT_RSP:
2167 mei_io_cb_free(cb);
2168 mei_cl_set_disconnected(cl);
2169 break;
2170 default:
2171 BUG_ON(0);
2172 }
2173}
2174
2175
2176/**
2177 * mei_cl_all_disconnect - disconnect forcefully all connected clients
2178 *
2179 * @dev: mei device
2180 */
2181void mei_cl_all_disconnect(struct mei_device *dev)
2182{
2183 struct mei_cl *cl;
2184
2185 list_for_each_entry(cl, &dev->file_list, link)
2186 mei_cl_set_disconnected(cl);
2187}
2188EXPORT_SYMBOL_GPL(mei_cl_all_disconnect);
2189
2190static struct mei_cl *mei_cl_dma_map_find(struct mei_device *dev, u8 buffer_id)
2191{
2192 struct mei_cl *cl;
2193
2194 list_for_each_entry(cl, &dev->file_list, link)
2195 if (cl->dma.buffer_id == buffer_id)
2196 return cl;
2197 return NULL;
2198}
2199
2200/**
2201 * mei_cl_irq_dma_map - send client dma map request in irq_thread context
2202 *
2203 * @cl: client
2204 * @cb: callback block.
2205 * @cmpl_list: complete list.
2206 *
2207 * Return: 0 on such and error otherwise.
2208 */
2209int mei_cl_irq_dma_map(struct mei_cl *cl, struct mei_cl_cb *cb,
2210 struct list_head *cmpl_list)
2211{
2212 struct mei_device *dev = cl->dev;
2213 u32 msg_slots;
2214 int slots;
2215 int ret;
2216
2217 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_dma_map_request));
2218 slots = mei_hbuf_empty_slots(dev);
2219 if (slots < 0)
2220 return -EOVERFLOW;
2221
2222 if ((u32)slots < msg_slots)
2223 return -EMSGSIZE;
2224
2225 ret = mei_hbm_cl_dma_map_req(dev, cl);
2226 if (ret) {
2227 cl->status = ret;
2228 list_move_tail(&cb->list, cmpl_list);
2229 return ret;
2230 }
2231
2232 list_move_tail(&cb->list, &dev->ctrl_rd_list);
2233 return 0;
2234}
2235
2236/**
2237 * mei_cl_irq_dma_unmap - send client dma unmap request in irq_thread context
2238 *
2239 * @cl: client
2240 * @cb: callback block.
2241 * @cmpl_list: complete list.
2242 *
2243 * Return: 0 on such and error otherwise.
2244 */
2245int mei_cl_irq_dma_unmap(struct mei_cl *cl, struct mei_cl_cb *cb,
2246 struct list_head *cmpl_list)
2247{
2248 struct mei_device *dev = cl->dev;
2249 u32 msg_slots;
2250 int slots;
2251 int ret;
2252
2253 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_dma_unmap_request));
2254 slots = mei_hbuf_empty_slots(dev);
2255 if (slots < 0)
2256 return -EOVERFLOW;
2257
2258 if ((u32)slots < msg_slots)
2259 return -EMSGSIZE;
2260
2261 ret = mei_hbm_cl_dma_unmap_req(dev, cl);
2262 if (ret) {
2263 cl->status = ret;
2264 list_move_tail(&cb->list, cmpl_list);
2265 return ret;
2266 }
2267
2268 list_move_tail(&cb->list, &dev->ctrl_rd_list);
2269 return 0;
2270}
2271
2272static int mei_cl_dma_alloc(struct mei_cl *cl, u8 buf_id, size_t size)
2273{
2274 cl->dma.vaddr = dmam_alloc_coherent(cl->dev->dev, size,
2275 &cl->dma.daddr, GFP_KERNEL);
2276 if (!cl->dma.vaddr)
2277 return -ENOMEM;
2278
2279 cl->dma.buffer_id = buf_id;
2280 cl->dma.size = size;
2281
2282 return 0;
2283}
2284
2285static void mei_cl_dma_free(struct mei_cl *cl)
2286{
2287 cl->dma.buffer_id = 0;
2288 dmam_free_coherent(cl->dev->dev,
2289 cl->dma.size, cl->dma.vaddr, cl->dma.daddr);
2290 cl->dma.size = 0;
2291 cl->dma.vaddr = NULL;
2292 cl->dma.daddr = 0;
2293}
2294
2295/**
2296 * mei_cl_dma_alloc_and_map - send client dma map request
2297 *
2298 * @cl: host client
2299 * @fp: pointer to file structure
2300 * @buffer_id: id of the mapped buffer
2301 * @size: size of the buffer
2302 *
2303 * Locking: called under "dev->device_lock" lock
2304 *
2305 * Return:
2306 * * -ENODEV
2307 * * -EINVAL
2308 * * -EOPNOTSUPP
2309 * * -EPROTO
2310 * * -ENOMEM;
2311 */
2312int mei_cl_dma_alloc_and_map(struct mei_cl *cl, const struct file *fp,
2313 u8 buffer_id, size_t size)
2314{
2315 struct mei_device *dev;
2316 struct mei_cl_cb *cb;
2317 int rets;
2318
2319 if (WARN_ON(!cl || !cl->dev))
2320 return -ENODEV;
2321
2322 dev = cl->dev;
2323
2324 if (!dev->hbm_f_cd_supported) {
2325 cl_dbg(dev, cl, "client dma is not supported\n");
2326 return -EOPNOTSUPP;
2327 }
2328
2329 if (buffer_id == 0)
2330 return -EINVAL;
2331
2332 if (mei_cl_is_connected(cl))
2333 return -EPROTO;
2334
2335 if (cl->dma_mapped)
2336 return -EPROTO;
2337
2338 if (mei_cl_dma_map_find(dev, buffer_id)) {
2339 cl_dbg(dev, cl, "client dma with id %d is already allocated\n",
2340 cl->dma.buffer_id);
2341 return -EPROTO;
2342 }
2343
2344 rets = pm_runtime_get(dev->dev);
2345 if (rets < 0 && rets != -EINPROGRESS) {
2346 pm_runtime_put_noidle(dev->dev);
2347 cl_err(dev, cl, "rpm: get failed %d\n", rets);
2348 return rets;
2349 }
2350
2351 rets = mei_cl_dma_alloc(cl, buffer_id, size);
2352 if (rets) {
2353 pm_runtime_put_noidle(dev->dev);
2354 return rets;
2355 }
2356
2357 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DMA_MAP, fp);
2358 if (!cb) {
2359 rets = -ENOMEM;
2360 goto out;
2361 }
2362
2363 if (mei_hbuf_acquire(dev)) {
2364 if (mei_hbm_cl_dma_map_req(dev, cl)) {
2365 rets = -ENODEV;
2366 goto out;
2367 }
2368 list_move_tail(&cb->list, &dev->ctrl_rd_list);
2369 }
2370
2371 cl->status = 0;
2372
2373 mutex_unlock(&dev->device_lock);
2374 wait_event_timeout(cl->wait,
2375 cl->dma_mapped || cl->status,
2376 dev->timeouts.cl_connect);
2377 mutex_lock(&dev->device_lock);
2378
2379 if (!cl->dma_mapped && !cl->status)
2380 cl->status = -EFAULT;
2381
2382 rets = cl->status;
2383
2384out:
2385 if (rets)
2386 mei_cl_dma_free(cl);
2387
2388 cl_dbg(dev, cl, "rpm: autosuspend\n");
2389 pm_runtime_mark_last_busy(dev->dev);
2390 pm_runtime_put_autosuspend(dev->dev);
2391
2392 mei_io_cb_free(cb);
2393 return rets;
2394}
2395
2396/**
2397 * mei_cl_dma_unmap - send client dma unmap request
2398 *
2399 * @cl: host client
2400 * @fp: pointer to file structure
2401 *
2402 * Locking: called under "dev->device_lock" lock
2403 *
2404 * Return: 0 on such and error otherwise.
2405 */
2406int mei_cl_dma_unmap(struct mei_cl *cl, const struct file *fp)
2407{
2408 struct mei_device *dev;
2409 struct mei_cl_cb *cb;
2410 int rets;
2411
2412 if (WARN_ON(!cl || !cl->dev))
2413 return -ENODEV;
2414
2415 dev = cl->dev;
2416
2417 if (!dev->hbm_f_cd_supported) {
2418 cl_dbg(dev, cl, "client dma is not supported\n");
2419 return -EOPNOTSUPP;
2420 }
2421
2422 /* do not allow unmap for connected client */
2423 if (mei_cl_is_connected(cl))
2424 return -EPROTO;
2425
2426 if (!cl->dma_mapped)
2427 return -EPROTO;
2428
2429 rets = pm_runtime_get(dev->dev);
2430 if (rets < 0 && rets != -EINPROGRESS) {
2431 pm_runtime_put_noidle(dev->dev);
2432 cl_err(dev, cl, "rpm: get failed %d\n", rets);
2433 return rets;
2434 }
2435
2436 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DMA_UNMAP, fp);
2437 if (!cb) {
2438 rets = -ENOMEM;
2439 goto out;
2440 }
2441
2442 if (mei_hbuf_acquire(dev)) {
2443 if (mei_hbm_cl_dma_unmap_req(dev, cl)) {
2444 rets = -ENODEV;
2445 goto out;
2446 }
2447 list_move_tail(&cb->list, &dev->ctrl_rd_list);
2448 }
2449
2450 cl->status = 0;
2451
2452 mutex_unlock(&dev->device_lock);
2453 wait_event_timeout(cl->wait,
2454 !cl->dma_mapped || cl->status,
2455 dev->timeouts.cl_connect);
2456 mutex_lock(&dev->device_lock);
2457
2458 if (cl->dma_mapped && !cl->status)
2459 cl->status = -EFAULT;
2460
2461 rets = cl->status;
2462
2463 if (!rets)
2464 mei_cl_dma_free(cl);
2465out:
2466 cl_dbg(dev, cl, "rpm: autosuspend\n");
2467 pm_runtime_mark_last_busy(dev->dev);
2468 pm_runtime_put_autosuspend(dev->dev);
2469
2470 mei_io_cb_free(cb);
2471 return rets;
2472}