3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
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.
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
17 #include <linux/sched/signal.h>
18 #include <linux/wait.h>
19 #include <linux/delay.h>
20 #include <linux/slab.h>
21 #include <linux/pm_runtime.h>
23 #include <linux/mei.h>
30 * mei_me_cl_init - initialize me client
34 void mei_me_cl_init(struct mei_me_client *me_cl)
36 INIT_LIST_HEAD(&me_cl->list);
37 kref_init(&me_cl->refcnt);
41 * mei_me_cl_get - increases me client refcount
45 * Locking: called under "dev->device_lock" lock
47 * Return: me client or NULL
49 struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl)
51 if (me_cl && kref_get_unless_zero(&me_cl->refcnt))
58 * mei_me_cl_release - free me client
60 * Locking: called under "dev->device_lock" lock
62 * @ref: me_client refcount
64 static void mei_me_cl_release(struct kref *ref)
66 struct mei_me_client *me_cl =
67 container_of(ref, struct mei_me_client, refcnt);
73 * mei_me_cl_put - decrease me client refcount and free client if necessary
75 * Locking: called under "dev->device_lock" lock
79 void mei_me_cl_put(struct mei_me_client *me_cl)
82 kref_put(&me_cl->refcnt, mei_me_cl_release);
86 * __mei_me_cl_del - delete me client from the list and decrease
92 * Locking: dev->me_clients_rwsem
94 static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
99 list_del_init(&me_cl->list);
100 mei_me_cl_put(me_cl);
104 * mei_me_cl_del - delete me client from the list and decrease
110 void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
112 down_write(&dev->me_clients_rwsem);
113 __mei_me_cl_del(dev, me_cl);
114 up_write(&dev->me_clients_rwsem);
118 * mei_me_cl_add - add me client to the list
123 void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl)
125 down_write(&dev->me_clients_rwsem);
126 list_add(&me_cl->list, &dev->me_clients);
127 up_write(&dev->me_clients_rwsem);
131 * __mei_me_cl_by_uuid - locate me client by uuid
132 * increases ref count
135 * @uuid: me client uuid
137 * Return: me client or NULL if not found
139 * Locking: dev->me_clients_rwsem
141 static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev,
144 struct mei_me_client *me_cl;
147 WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
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);
159 * mei_me_cl_by_uuid - locate me client by uuid
160 * increases ref count
163 * @uuid: me client uuid
165 * Return: me client or NULL if not found
167 * Locking: dev->me_clients_rwsem
169 struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
172 struct mei_me_client *me_cl;
174 down_read(&dev->me_clients_rwsem);
175 me_cl = __mei_me_cl_by_uuid(dev, uuid);
176 up_read(&dev->me_clients_rwsem);
182 * mei_me_cl_by_id - locate me client by client id
183 * increases ref count
185 * @dev: the device structure
186 * @client_id: me client id
188 * Return: me client or NULL if not found
190 * Locking: dev->me_clients_rwsem
192 struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
195 struct mei_me_client *__me_cl, *me_cl = NULL;
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);
204 up_read(&dev->me_clients_rwsem);
210 * __mei_me_cl_by_uuid_id - locate me client by client id and uuid
211 * increases ref count
213 * @dev: the device structure
214 * @uuid: me client uuid
215 * @client_id: me client id
217 * Return: me client or null if not found
219 * Locking: dev->me_clients_rwsem
221 static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev,
222 const uuid_le *uuid, u8 client_id)
224 struct mei_me_client *me_cl;
227 WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
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);
241 * mei_me_cl_by_uuid_id - locate me client by client id and uuid
242 * increases ref count
244 * @dev: the device structure
245 * @uuid: me client uuid
246 * @client_id: me client id
248 * Return: me client or null if not found
250 struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
251 const uuid_le *uuid, u8 client_id)
253 struct mei_me_client *me_cl;
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);
263 * mei_me_cl_rm_by_uuid - remove all me clients matching uuid
265 * @dev: the device structure
266 * @uuid: me client uuid
268 * Locking: called under "dev->device_lock" lock
270 void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
272 struct mei_me_client *me_cl;
274 dev_dbg(dev->dev, "remove %pUl\n", uuid);
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);
283 * mei_me_cl_rm_by_uuid_id - remove all me clients matching client id
285 * @dev: the device structure
286 * @uuid: me client uuid
289 * Locking: called under "dev->device_lock" lock
291 void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id)
293 struct mei_me_client *me_cl;
295 dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id);
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);
304 * mei_me_cl_rm_all - remove all me clients
306 * @dev: the device structure
308 * Locking: called under "dev->device_lock" lock
310 void mei_me_cl_rm_all(struct mei_device *dev)
312 struct mei_me_client *me_cl, *next;
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);
321 * mei_io_cb_free - free mei_cb_private related memory
323 * @cb: mei callback struct
325 void mei_io_cb_free(struct mei_cl_cb *cb)
336 * mei_tx_cb_queue - queue tx callback
338 * Locking: called under "dev->device_lock" lock
340 * @cb: mei callback struct
341 * @head: an instance of list to queue on
343 static inline void mei_tx_cb_enqueue(struct mei_cl_cb *cb,
344 struct list_head *head)
346 list_add_tail(&cb->list, head);
347 cb->cl->tx_cb_queued++;
351 * mei_tx_cb_dequeue - dequeue tx callback
353 * Locking: called under "dev->device_lock" lock
355 * @cb: mei callback struct to dequeue and free
357 static inline void mei_tx_cb_dequeue(struct mei_cl_cb *cb)
359 if (!WARN_ON(cb->cl->tx_cb_queued == 0))
360 cb->cl->tx_cb_queued--;
366 * mei_io_cb_init - allocate and initialize io callback
369 * @type: operation type
370 * @fp: pointer to file structure
372 * Return: mei_cl_cb pointer or NULL;
374 static struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl,
375 enum mei_cb_file_ops type,
376 const struct file *fp)
378 struct mei_cl_cb *cb;
380 cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
384 INIT_LIST_HEAD(&cb->list);
393 * mei_io_list_flush_cl - removes cbs belonging to the cl.
395 * @head: an instance of our list structure
398 static void mei_io_list_flush_cl(struct list_head *head,
399 const struct mei_cl *cl)
401 struct mei_cl_cb *cb, *next;
403 list_for_each_entry_safe(cb, next, head, list) {
405 list_del_init(&cb->list);
406 if (cb->fop_type == MEI_FOP_READ)
413 * mei_io_tx_list_free_cl - removes cb belonging to the cl and free them
415 * @head: An instance of our list structure
418 static void mei_io_tx_list_free_cl(struct list_head *head,
419 const struct mei_cl *cl)
421 struct mei_cl_cb *cb, *next;
423 list_for_each_entry_safe(cb, next, head, list) {
425 mei_tx_cb_dequeue(cb);
430 * mei_io_list_free_fp - free cb from a list that matches file pointer
433 * @fp: file pointer (matching cb file object), may be NULL
435 static void mei_io_list_free_fp(struct list_head *head, const struct file *fp)
437 struct mei_cl_cb *cb, *next;
439 list_for_each_entry_safe(cb, next, head, list)
440 if (!fp || fp == cb->fp)
445 * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
448 * @length: size of the buffer
449 * @fop_type: operation type
450 * @fp: associated file pointer (might be NULL)
452 * Return: cb on success and NULL on failure
454 struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
455 enum mei_cb_file_ops fop_type,
456 const struct file *fp)
458 struct mei_cl_cb *cb;
460 cb = mei_io_cb_init(cl, fop_type, fp);
467 cb->buf.data = kmalloc(roundup(length, MEI_SLOT_SIZE), GFP_KERNEL);
472 cb->buf.size = length;
478 * mei_cl_enqueue_ctrl_wr_cb - a convenient wrapper for allocating
479 * and enqueuing of the control commands cb
482 * @length: size of the buffer
483 * @fop_type: operation type
484 * @fp: associated file pointer (might be NULL)
486 * Return: cb on success and NULL on failure
487 * Locking: called under "dev->device_lock" lock
489 struct mei_cl_cb *mei_cl_enqueue_ctrl_wr_cb(struct mei_cl *cl, size_t length,
490 enum mei_cb_file_ops fop_type,
491 const struct file *fp)
493 struct mei_cl_cb *cb;
495 /* for RX always allocate at least client's mtu */
497 length = max_t(size_t, length, mei_cl_mtu(cl));
499 cb = mei_cl_alloc_cb(cl, length, fop_type, fp);
503 list_add_tail(&cb->list, &cl->dev->ctrl_wr_list);
508 * mei_cl_read_cb - find this cl's callback in the read list
509 * for a specific file
512 * @fp: file pointer (matching cb file object), may be NULL
514 * Return: cb on success, NULL if cb is not found
516 struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp)
518 struct mei_cl_cb *cb;
520 list_for_each_entry(cb, &cl->rd_completed, list)
521 if (!fp || fp == cb->fp)
528 * mei_cl_flush_queues - flushes queue lists belonging to cl.
531 * @fp: file pointer (matching cb file object), may be NULL
533 * Return: 0 on success, -EINVAL if cl or cl->dev is NULL.
535 int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
537 struct mei_device *dev;
539 if (WARN_ON(!cl || !cl->dev))
544 cl_dbg(dev, cl, "remove list entry belonging to cl\n");
545 mei_io_tx_list_free_cl(&cl->dev->write_list, cl);
546 mei_io_tx_list_free_cl(&cl->dev->write_waiting_list, cl);
547 mei_io_list_flush_cl(&cl->dev->ctrl_wr_list, cl);
548 mei_io_list_flush_cl(&cl->dev->ctrl_rd_list, cl);
549 mei_io_list_free_fp(&cl->rd_pending, fp);
550 mei_io_list_free_fp(&cl->rd_completed, fp);
556 * mei_cl_init - initializes cl.
558 * @cl: host client to be initialized
561 static void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
563 memset(cl, 0, sizeof(struct mei_cl));
564 init_waitqueue_head(&cl->wait);
565 init_waitqueue_head(&cl->rx_wait);
566 init_waitqueue_head(&cl->tx_wait);
567 init_waitqueue_head(&cl->ev_wait);
568 INIT_LIST_HEAD(&cl->rd_completed);
569 INIT_LIST_HEAD(&cl->rd_pending);
570 INIT_LIST_HEAD(&cl->link);
571 cl->writing_state = MEI_IDLE;
572 cl->state = MEI_FILE_UNINITIALIZED;
577 * mei_cl_allocate - allocates cl structure and sets it up.
580 * Return: The allocated file or NULL on failure
582 struct mei_cl *mei_cl_allocate(struct mei_device *dev)
586 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
590 mei_cl_init(cl, dev);
596 * mei_cl_link - allocate host id in the host map
600 * Return: 0 on success
601 * -EINVAL on incorrect values
602 * -EMFILE if open count exceeded.
604 int mei_cl_link(struct mei_cl *cl)
606 struct mei_device *dev;
609 if (WARN_ON(!cl || !cl->dev))
614 id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX);
615 if (id >= MEI_CLIENTS_MAX) {
616 dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX);
620 if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
621 dev_err(dev->dev, "open_handle_count exceeded %d",
622 MEI_MAX_OPEN_HANDLE_COUNT);
626 dev->open_handle_count++;
628 cl->host_client_id = id;
629 list_add_tail(&cl->link, &dev->file_list);
631 set_bit(id, dev->host_clients_map);
633 cl->state = MEI_FILE_INITIALIZING;
635 cl_dbg(dev, cl, "link cl\n");
640 * mei_cl_unlink - remove host client from the list
646 int mei_cl_unlink(struct mei_cl *cl)
648 struct mei_device *dev;
650 /* don't shout on error exit path */
654 if (WARN_ON(!cl->dev))
659 cl_dbg(dev, cl, "unlink client");
661 if (dev->open_handle_count > 0)
662 dev->open_handle_count--;
664 /* never clear the 0 bit */
665 if (cl->host_client_id)
666 clear_bit(cl->host_client_id, dev->host_clients_map);
668 list_del_init(&cl->link);
670 cl->state = MEI_FILE_UNINITIALIZED;
671 cl->writing_state = MEI_IDLE;
673 WARN_ON(!list_empty(&cl->rd_completed) ||
674 !list_empty(&cl->rd_pending) ||
675 !list_empty(&cl->link));
680 void mei_host_client_init(struct mei_device *dev)
682 dev->dev_state = MEI_DEV_ENABLED;
683 dev->reset_count = 0;
685 schedule_work(&dev->bus_rescan_work);
687 pm_runtime_mark_last_busy(dev->dev);
688 dev_dbg(dev->dev, "rpm: autosuspend\n");
689 pm_request_autosuspend(dev->dev);
693 * mei_hbuf_acquire - try to acquire host buffer
695 * @dev: the device structure
696 * Return: true if host buffer was acquired
698 bool mei_hbuf_acquire(struct mei_device *dev)
700 if (mei_pg_state(dev) == MEI_PG_ON ||
701 mei_pg_in_transition(dev)) {
702 dev_dbg(dev->dev, "device is in pg\n");
706 if (!dev->hbuf_is_ready) {
707 dev_dbg(dev->dev, "hbuf is not ready\n");
711 dev->hbuf_is_ready = false;
717 * mei_cl_wake_all - wake up readers, writers and event waiters so
718 * they can be interrupted
722 static void mei_cl_wake_all(struct mei_cl *cl)
724 struct mei_device *dev = cl->dev;
726 /* synchronized under device mutex */
727 if (waitqueue_active(&cl->rx_wait)) {
728 cl_dbg(dev, cl, "Waking up reading client!\n");
729 wake_up_interruptible(&cl->rx_wait);
731 /* synchronized under device mutex */
732 if (waitqueue_active(&cl->tx_wait)) {
733 cl_dbg(dev, cl, "Waking up writing client!\n");
734 wake_up_interruptible(&cl->tx_wait);
736 /* synchronized under device mutex */
737 if (waitqueue_active(&cl->ev_wait)) {
738 cl_dbg(dev, cl, "Waking up waiting for event clients!\n");
739 wake_up_interruptible(&cl->ev_wait);
741 /* synchronized under device mutex */
742 if (waitqueue_active(&cl->wait)) {
743 cl_dbg(dev, cl, "Waking up ctrl write clients!\n");
749 * mei_cl_set_disconnected - set disconnected state and clear
750 * associated states and resources
754 static void mei_cl_set_disconnected(struct mei_cl *cl)
756 struct mei_device *dev = cl->dev;
758 if (cl->state == MEI_FILE_DISCONNECTED ||
759 cl->state <= MEI_FILE_INITIALIZING)
762 cl->state = MEI_FILE_DISCONNECTED;
763 mei_io_tx_list_free_cl(&dev->write_list, cl);
764 mei_io_tx_list_free_cl(&dev->write_waiting_list, cl);
765 mei_io_list_flush_cl(&dev->ctrl_rd_list, cl);
766 mei_io_list_flush_cl(&dev->ctrl_wr_list, cl);
768 cl->rx_flow_ctrl_creds = 0;
769 cl->tx_flow_ctrl_creds = 0;
775 if (!WARN_ON(cl->me_cl->connect_count == 0))
776 cl->me_cl->connect_count--;
778 if (cl->me_cl->connect_count == 0)
779 cl->me_cl->tx_flow_ctrl_creds = 0;
781 mei_me_cl_put(cl->me_cl);
785 static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl)
787 if (!mei_me_cl_get(me_cl))
790 /* only one connection is allowed for fixed address clients */
791 if (me_cl->props.fixed_address) {
792 if (me_cl->connect_count) {
793 mei_me_cl_put(me_cl);
799 cl->state = MEI_FILE_CONNECTING;
800 cl->me_cl->connect_count++;
806 * mei_cl_send_disconnect - send disconnect request
809 * @cb: callback block
811 * Return: 0, OK; otherwise, error.
813 static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb)
815 struct mei_device *dev;
820 ret = mei_hbm_cl_disconnect_req(dev, cl);
823 cl->state = MEI_FILE_DISCONNECT_REPLY;
827 list_move_tail(&cb->list, &dev->ctrl_rd_list);
828 cl->timer_count = MEI_CONNECT_TIMEOUT;
829 mei_schedule_stall_timer(dev);
835 * mei_cl_irq_disconnect - processes close related operation from
836 * interrupt thread context - send disconnect request
839 * @cb: callback block.
840 * @cmpl_list: complete list.
842 * Return: 0, OK; otherwise, error.
844 int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
845 struct list_head *cmpl_list)
847 struct mei_device *dev = cl->dev;
852 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_request));
853 slots = mei_hbuf_empty_slots(dev);
857 if ((u32)slots < msg_slots)
860 ret = mei_cl_send_disconnect(cl, cb);
862 list_move_tail(&cb->list, cmpl_list);
868 * __mei_cl_disconnect - disconnect host client from the me one
869 * internal function runtime pm has to be already acquired
873 * Return: 0 on success, <0 on failure.
875 static int __mei_cl_disconnect(struct mei_cl *cl)
877 struct mei_device *dev;
878 struct mei_cl_cb *cb;
883 cl->state = MEI_FILE_DISCONNECTING;
885 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT, NULL);
891 if (mei_hbuf_acquire(dev)) {
892 rets = mei_cl_send_disconnect(cl, cb);
894 cl_err(dev, cl, "failed to disconnect.\n");
899 mutex_unlock(&dev->device_lock);
900 wait_event_timeout(cl->wait,
901 cl->state == MEI_FILE_DISCONNECT_REPLY ||
902 cl->state == MEI_FILE_DISCONNECTED,
903 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
904 mutex_lock(&dev->device_lock);
907 if (cl->state != MEI_FILE_DISCONNECT_REPLY &&
908 cl->state != MEI_FILE_DISCONNECTED) {
909 cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
914 /* we disconnect also on error */
915 mei_cl_set_disconnected(cl);
917 cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
924 * mei_cl_disconnect - disconnect host client from the me one
928 * Locking: called under "dev->device_lock" lock
930 * Return: 0 on success, <0 on failure.
932 int mei_cl_disconnect(struct mei_cl *cl)
934 struct mei_device *dev;
937 if (WARN_ON(!cl || !cl->dev))
942 cl_dbg(dev, cl, "disconnecting");
944 if (!mei_cl_is_connected(cl))
947 if (mei_cl_is_fixed_address(cl)) {
948 mei_cl_set_disconnected(cl);
952 if (dev->dev_state == MEI_DEV_POWER_DOWN) {
953 cl_dbg(dev, cl, "Device is powering down, don't bother with disconnection\n");
954 mei_cl_set_disconnected(cl);
958 rets = pm_runtime_get(dev->dev);
959 if (rets < 0 && rets != -EINPROGRESS) {
960 pm_runtime_put_noidle(dev->dev);
961 cl_err(dev, cl, "rpm: get failed %d\n", rets);
965 rets = __mei_cl_disconnect(cl);
967 cl_dbg(dev, cl, "rpm: autosuspend\n");
968 pm_runtime_mark_last_busy(dev->dev);
969 pm_runtime_put_autosuspend(dev->dev);
976 * mei_cl_is_other_connecting - checks if other
977 * client with the same me client id is connecting
979 * @cl: private data of the file object
981 * Return: true if other client is connected, false - otherwise.
983 static bool mei_cl_is_other_connecting(struct mei_cl *cl)
985 struct mei_device *dev;
986 struct mei_cl_cb *cb;
990 list_for_each_entry(cb, &dev->ctrl_rd_list, list) {
991 if (cb->fop_type == MEI_FOP_CONNECT &&
992 mei_cl_me_id(cl) == mei_cl_me_id(cb->cl))
1000 * mei_cl_send_connect - send connect request
1003 * @cb: callback block
1005 * Return: 0, OK; otherwise, error.
1007 static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
1009 struct mei_device *dev;
1014 ret = mei_hbm_cl_connect_req(dev, cl);
1017 cl->state = MEI_FILE_DISCONNECT_REPLY;
1021 list_move_tail(&cb->list, &dev->ctrl_rd_list);
1022 cl->timer_count = MEI_CONNECT_TIMEOUT;
1023 mei_schedule_stall_timer(dev);
1028 * mei_cl_irq_connect - send connect request in irq_thread context
1031 * @cb: callback block
1032 * @cmpl_list: complete list
1034 * Return: 0, OK; otherwise, error.
1036 int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
1037 struct list_head *cmpl_list)
1039 struct mei_device *dev = cl->dev;
1044 if (mei_cl_is_other_connecting(cl))
1047 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_request));
1048 slots = mei_hbuf_empty_slots(dev);
1052 if ((u32)slots < msg_slots)
1055 rets = mei_cl_send_connect(cl, cb);
1057 list_move_tail(&cb->list, cmpl_list);
1063 * mei_cl_connect - connect host client to the me one
1067 * @fp: pointer to file structure
1069 * Locking: called under "dev->device_lock" lock
1071 * Return: 0 on success, <0 on failure.
1073 int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
1074 const struct file *fp)
1076 struct mei_device *dev;
1077 struct mei_cl_cb *cb;
1080 if (WARN_ON(!cl || !cl->dev || !me_cl))
1085 rets = mei_cl_set_connecting(cl, me_cl);
1089 if (mei_cl_is_fixed_address(cl)) {
1090 cl->state = MEI_FILE_CONNECTED;
1095 rets = pm_runtime_get(dev->dev);
1096 if (rets < 0 && rets != -EINPROGRESS) {
1097 pm_runtime_put_noidle(dev->dev);
1098 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1102 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_CONNECT, fp);
1108 /* run hbuf acquire last so we don't have to undo */
1109 if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
1110 rets = mei_cl_send_connect(cl, cb);
1115 mutex_unlock(&dev->device_lock);
1116 wait_event_timeout(cl->wait,
1117 (cl->state == MEI_FILE_CONNECTED ||
1118 cl->state == MEI_FILE_DISCONNECTED ||
1119 cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
1120 cl->state == MEI_FILE_DISCONNECT_REPLY),
1121 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
1122 mutex_lock(&dev->device_lock);
1124 if (!mei_cl_is_connected(cl)) {
1125 if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) {
1126 mei_io_list_flush_cl(&dev->ctrl_rd_list, cl);
1127 mei_io_list_flush_cl(&dev->ctrl_wr_list, cl);
1128 /* ignore disconnect return valuue;
1129 * in case of failure reset will be invoked
1131 __mei_cl_disconnect(cl);
1136 /* timeout or something went really wrong */
1138 cl->status = -EFAULT;
1143 cl_dbg(dev, cl, "rpm: autosuspend\n");
1144 pm_runtime_mark_last_busy(dev->dev);
1145 pm_runtime_put_autosuspend(dev->dev);
1150 if (!mei_cl_is_connected(cl))
1151 mei_cl_set_disconnected(cl);
1157 * mei_cl_alloc_linked - allocate and link host client
1159 * @dev: the device structure
1161 * Return: cl on success ERR_PTR on failure
1163 struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev)
1168 cl = mei_cl_allocate(dev);
1174 ret = mei_cl_link(cl);
1181 return ERR_PTR(ret);
1185 * mei_cl_tx_flow_ctrl_creds - checks flow_control credits for cl.
1189 * Return: 1 if tx_flow_ctrl_creds >0, 0 - otherwise.
1191 static int mei_cl_tx_flow_ctrl_creds(struct mei_cl *cl)
1193 if (WARN_ON(!cl || !cl->me_cl))
1196 if (cl->tx_flow_ctrl_creds > 0)
1199 if (mei_cl_is_fixed_address(cl))
1202 if (mei_cl_is_single_recv_buf(cl)) {
1203 if (cl->me_cl->tx_flow_ctrl_creds > 0)
1210 * mei_cl_tx_flow_ctrl_creds_reduce - reduces transmit flow control credits
1217 * -EINVAL when ctrl credits are <= 0
1219 static int mei_cl_tx_flow_ctrl_creds_reduce(struct mei_cl *cl)
1221 if (WARN_ON(!cl || !cl->me_cl))
1224 if (mei_cl_is_fixed_address(cl))
1227 if (mei_cl_is_single_recv_buf(cl)) {
1228 if (WARN_ON(cl->me_cl->tx_flow_ctrl_creds <= 0))
1230 cl->me_cl->tx_flow_ctrl_creds--;
1232 if (WARN_ON(cl->tx_flow_ctrl_creds <= 0))
1234 cl->tx_flow_ctrl_creds--;
1240 * mei_cl_notify_fop2req - convert fop to proper request
1242 * @fop: client notification start response command
1244 * Return: MEI_HBM_NOTIFICATION_START/STOP
1246 u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop)
1248 if (fop == MEI_FOP_NOTIFY_START)
1249 return MEI_HBM_NOTIFICATION_START;
1251 return MEI_HBM_NOTIFICATION_STOP;
1255 * mei_cl_notify_req2fop - convert notification request top file operation type
1257 * @req: hbm notification request type
1259 * Return: MEI_FOP_NOTIFY_START/STOP
1261 enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req)
1263 if (req == MEI_HBM_NOTIFICATION_START)
1264 return MEI_FOP_NOTIFY_START;
1266 return MEI_FOP_NOTIFY_STOP;
1270 * mei_cl_irq_notify - send notification request in irq_thread context
1273 * @cb: callback block.
1274 * @cmpl_list: complete list.
1276 * Return: 0 on such and error otherwise.
1278 int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb,
1279 struct list_head *cmpl_list)
1281 struct mei_device *dev = cl->dev;
1287 msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_request));
1288 slots = mei_hbuf_empty_slots(dev);
1292 if ((u32)slots < msg_slots)
1295 request = mei_cl_notify_fop2req(cb->fop_type);
1296 ret = mei_hbm_cl_notify_req(dev, cl, request);
1299 list_move_tail(&cb->list, cmpl_list);
1303 list_move_tail(&cb->list, &dev->ctrl_rd_list);
1308 * mei_cl_notify_request - send notification stop/start request
1311 * @fp: associate request with file
1312 * @request: 1 for start or 0 for stop
1314 * Locking: called under "dev->device_lock" lock
1316 * Return: 0 on such and error otherwise.
1318 int mei_cl_notify_request(struct mei_cl *cl,
1319 const struct file *fp, u8 request)
1321 struct mei_device *dev;
1322 struct mei_cl_cb *cb;
1323 enum mei_cb_file_ops fop_type;
1326 if (WARN_ON(!cl || !cl->dev))
1331 if (!dev->hbm_f_ev_supported) {
1332 cl_dbg(dev, cl, "notifications not supported\n");
1336 if (!mei_cl_is_connected(cl))
1339 rets = pm_runtime_get(dev->dev);
1340 if (rets < 0 && rets != -EINPROGRESS) {
1341 pm_runtime_put_noidle(dev->dev);
1342 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1346 fop_type = mei_cl_notify_req2fop(request);
1347 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, fop_type, fp);
1353 if (mei_hbuf_acquire(dev)) {
1354 if (mei_hbm_cl_notify_req(dev, cl, request)) {
1358 list_move_tail(&cb->list, &dev->ctrl_rd_list);
1361 mutex_unlock(&dev->device_lock);
1362 wait_event_timeout(cl->wait,
1363 cl->notify_en == request ||
1365 !mei_cl_is_connected(cl),
1366 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
1367 mutex_lock(&dev->device_lock);
1369 if (cl->notify_en != request && !cl->status)
1370 cl->status = -EFAULT;
1375 cl_dbg(dev, cl, "rpm: autosuspend\n");
1376 pm_runtime_mark_last_busy(dev->dev);
1377 pm_runtime_put_autosuspend(dev->dev);
1384 * mei_cl_notify - raise notification
1388 * Locking: called under "dev->device_lock" lock
1390 void mei_cl_notify(struct mei_cl *cl)
1392 struct mei_device *dev;
1394 if (!cl || !cl->dev)
1402 cl_dbg(dev, cl, "notify event");
1403 cl->notify_ev = true;
1404 if (!mei_cl_bus_notify_event(cl))
1405 wake_up_interruptible(&cl->ev_wait);
1408 kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);
1413 * mei_cl_notify_get - get or wait for notification event
1416 * @block: this request is blocking
1417 * @notify_ev: true if notification event was received
1419 * Locking: called under "dev->device_lock" lock
1421 * Return: 0 on such and error otherwise.
1423 int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev)
1425 struct mei_device *dev;
1430 if (WARN_ON(!cl || !cl->dev))
1435 if (!dev->hbm_f_ev_supported) {
1436 cl_dbg(dev, cl, "notifications not supported\n");
1440 if (!mei_cl_is_connected(cl))
1449 mutex_unlock(&dev->device_lock);
1450 rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev);
1451 mutex_lock(&dev->device_lock);
1457 *notify_ev = cl->notify_ev;
1458 cl->notify_ev = false;
1463 * mei_cl_read_start - the start read client message function.
1466 * @length: number of bytes to read
1467 * @fp: pointer to file structure
1469 * Return: 0 on success, <0 on failure.
1471 int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp)
1473 struct mei_device *dev;
1474 struct mei_cl_cb *cb;
1477 if (WARN_ON(!cl || !cl->dev))
1482 if (!mei_cl_is_connected(cl))
1485 if (!mei_me_cl_is_active(cl->me_cl)) {
1486 cl_err(dev, cl, "no such me client\n");
1490 if (mei_cl_is_fixed_address(cl))
1493 /* HW currently supports only one pending read */
1494 if (cl->rx_flow_ctrl_creds)
1497 cb = mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, fp);
1501 rets = pm_runtime_get(dev->dev);
1502 if (rets < 0 && rets != -EINPROGRESS) {
1503 pm_runtime_put_noidle(dev->dev);
1504 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1509 if (mei_hbuf_acquire(dev)) {
1510 rets = mei_hbm_cl_flow_control_req(dev, cl);
1514 list_move_tail(&cb->list, &cl->rd_pending);
1516 cl->rx_flow_ctrl_creds++;
1519 cl_dbg(dev, cl, "rpm: autosuspend\n");
1520 pm_runtime_mark_last_busy(dev->dev);
1521 pm_runtime_put_autosuspend(dev->dev);
1530 * mei_msg_hdr_init - initialize mei message header
1532 * @mei_hdr: mei message header
1533 * @cb: message callback structure
1535 static void mei_msg_hdr_init(struct mei_msg_hdr *mei_hdr, struct mei_cl_cb *cb)
1537 mei_hdr->host_addr = mei_cl_host_addr(cb->cl);
1538 mei_hdr->me_addr = mei_cl_me_id(cb->cl);
1539 mei_hdr->length = 0;
1540 mei_hdr->reserved = 0;
1541 mei_hdr->msg_complete = 0;
1542 mei_hdr->dma_ring = 0;
1543 mei_hdr->internal = cb->internal;
1547 * mei_cl_irq_write - write a message to device
1548 * from the interrupt thread context
1551 * @cb: callback block.
1552 * @cmpl_list: complete list.
1554 * Return: 0, OK; otherwise error.
1556 int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
1557 struct list_head *cmpl_list)
1559 struct mei_device *dev;
1560 struct mei_msg_data *buf;
1561 struct mei_msg_hdr mei_hdr;
1562 size_t hdr_len = sizeof(mei_hdr);
1564 size_t hbuf_len, dr_len;
1572 if (WARN_ON(!cl || !cl->dev))
1579 first_chunk = cb->buf_idx == 0;
1581 rets = first_chunk ? mei_cl_tx_flow_ctrl_creds(cl) : 1;
1586 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1590 len = buf->size - cb->buf_idx;
1591 data = buf->data + cb->buf_idx;
1592 hbuf_slots = mei_hbuf_empty_slots(dev);
1593 if (hbuf_slots < 0) {
1598 hbuf_len = mei_slots2data(hbuf_slots);
1599 dr_slots = mei_dma_ring_empty_slots(dev);
1600 dr_len = mei_slots2data(dr_slots);
1602 mei_msg_hdr_init(&mei_hdr, cb);
1605 * Split the message only if we can write the whole host buffer
1606 * otherwise wait for next time the host buffer is empty.
1608 if (len + hdr_len <= hbuf_len) {
1609 mei_hdr.length = len;
1610 mei_hdr.msg_complete = 1;
1611 } else if (dr_slots && hbuf_len >= hdr_len + sizeof(dma_len)) {
1612 mei_hdr.dma_ring = 1;
1616 mei_hdr.msg_complete = 1;
1618 mei_hdr.length = sizeof(dma_len);
1621 } else if ((u32)hbuf_slots == mei_hbuf_depth(dev)) {
1622 len = hbuf_len - hdr_len;
1623 mei_hdr.length = len;
1628 if (mei_hdr.dma_ring)
1629 mei_dma_ring_write(dev, buf->data + cb->buf_idx, len);
1631 rets = mei_write_message(dev, &mei_hdr, hdr_len, data, mei_hdr.length);
1636 cl->writing_state = MEI_WRITING;
1640 if (mei_cl_tx_flow_ctrl_creds_reduce(cl)) {
1646 if (mei_hdr.msg_complete)
1647 list_move_tail(&cb->list, &dev->write_waiting_list);
1653 list_move_tail(&cb->list, cmpl_list);
1658 * mei_cl_write - submit a write cb to mei device
1659 * assumes device_lock is locked
1662 * @cb: write callback with filled data
1664 * Return: number of bytes sent on success, <0 on failure.
1666 ssize_t mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb)
1668 struct mei_device *dev;
1669 struct mei_msg_data *buf;
1670 struct mei_msg_hdr mei_hdr;
1671 size_t hdr_len = sizeof(mei_hdr);
1672 size_t len, hbuf_len, dr_len;
1680 if (WARN_ON(!cl || !cl->dev))
1691 cl_dbg(dev, cl, "len=%zd\n", len);
1693 blocking = cb->blocking;
1696 rets = pm_runtime_get(dev->dev);
1697 if (rets < 0 && rets != -EINPROGRESS) {
1698 pm_runtime_put_noidle(dev->dev);
1699 cl_err(dev, cl, "rpm: get failed %zd\n", rets);
1704 cl->writing_state = MEI_IDLE;
1707 rets = mei_cl_tx_flow_ctrl_creds(cl);
1711 mei_msg_hdr_init(&mei_hdr, cb);
1714 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1719 if (!mei_hbuf_acquire(dev)) {
1720 cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
1725 hbuf_slots = mei_hbuf_empty_slots(dev);
1726 if (hbuf_slots < 0) {
1731 hbuf_len = mei_slots2data(hbuf_slots);
1732 dr_slots = mei_dma_ring_empty_slots(dev);
1733 dr_len = mei_slots2data(dr_slots);
1735 if (len + hdr_len <= hbuf_len) {
1736 mei_hdr.length = len;
1737 mei_hdr.msg_complete = 1;
1738 } else if (dr_slots && hbuf_len >= hdr_len + sizeof(dma_len)) {
1739 mei_hdr.dma_ring = 1;
1743 mei_hdr.msg_complete = 1;
1745 mei_hdr.length = sizeof(dma_len);
1749 len = hbuf_len - hdr_len;
1750 mei_hdr.length = len;
1753 if (mei_hdr.dma_ring)
1754 mei_dma_ring_write(dev, buf->data, len);
1756 rets = mei_write_message(dev, &mei_hdr, hdr_len,
1757 data, mei_hdr.length);
1761 rets = mei_cl_tx_flow_ctrl_creds_reduce(cl);
1765 cl->writing_state = MEI_WRITING;
1767 /* restore return value */
1771 if (mei_hdr.msg_complete)
1772 mei_tx_cb_enqueue(cb, &dev->write_waiting_list);
1774 mei_tx_cb_enqueue(cb, &dev->write_list);
1777 if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
1779 mutex_unlock(&dev->device_lock);
1780 rets = wait_event_interruptible(cl->tx_wait,
1781 cl->writing_state == MEI_WRITE_COMPLETE ||
1782 (!mei_cl_is_connected(cl)));
1783 mutex_lock(&dev->device_lock);
1784 /* wait_event_interruptible returns -ERESTARTSYS */
1786 if (signal_pending(current))
1790 if (cl->writing_state != MEI_WRITE_COMPLETE) {
1798 cl_dbg(dev, cl, "rpm: autosuspend\n");
1799 pm_runtime_mark_last_busy(dev->dev);
1800 pm_runtime_put_autosuspend(dev->dev);
1809 * mei_cl_complete - processes completed operation for a client
1811 * @cl: private data of the file object.
1812 * @cb: callback block.
1814 void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
1816 struct mei_device *dev = cl->dev;
1818 switch (cb->fop_type) {
1820 mei_tx_cb_dequeue(cb);
1821 cl->writing_state = MEI_WRITE_COMPLETE;
1822 if (waitqueue_active(&cl->tx_wait)) {
1823 wake_up_interruptible(&cl->tx_wait);
1825 pm_runtime_mark_last_busy(dev->dev);
1826 pm_request_autosuspend(dev->dev);
1831 list_add_tail(&cb->list, &cl->rd_completed);
1832 if (!mei_cl_is_fixed_address(cl) &&
1833 !WARN_ON(!cl->rx_flow_ctrl_creds))
1834 cl->rx_flow_ctrl_creds--;
1835 if (!mei_cl_bus_rx_event(cl))
1836 wake_up_interruptible(&cl->rx_wait);
1839 case MEI_FOP_CONNECT:
1840 case MEI_FOP_DISCONNECT:
1841 case MEI_FOP_NOTIFY_STOP:
1842 case MEI_FOP_NOTIFY_START:
1843 if (waitqueue_active(&cl->wait))
1847 case MEI_FOP_DISCONNECT_RSP:
1849 mei_cl_set_disconnected(cl);
1858 * mei_cl_all_disconnect - disconnect forcefully all connected clients
1862 void mei_cl_all_disconnect(struct mei_device *dev)
1866 list_for_each_entry(cl, &dev->file_list, link)
1867 mei_cl_set_disconnected(cl);