| /* |
| * |
| * Intel Management Engine Interface (Intel MEI) Linux driver |
| * Copyright (c) 2003-2012, Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| */ |
| |
| #include <linux/pci.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/delay.h> |
| #include <linux/pm_runtime.h> |
| |
| #include <linux/mei.h> |
| |
| #include "mei_dev.h" |
| #include "hbm.h" |
| #include "client.h" |
| |
| /** |
| * mei_me_cl_by_uuid - locate index of me client |
| * |
| * @dev: mei device |
| * |
| * Locking: called under "dev->device_lock" lock |
| * |
| * returns me client or NULL if not found |
| */ |
| struct mei_me_client *mei_me_cl_by_uuid(const struct mei_device *dev, |
| const uuid_le *uuid) |
| { |
| struct mei_me_client *me_cl; |
| |
| list_for_each_entry(me_cl, &dev->me_clients, list) |
| if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0) |
| return me_cl; |
| |
| return NULL; |
| } |
| |
| /** |
| * mei_me_cl_by_id return index to me_clients for client_id |
| * |
| * @dev: the device structure |
| * @client_id: me client id |
| * |
| * Locking: called under "dev->device_lock" lock |
| * |
| * returns me client or NULL if not found |
| */ |
| |
| struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id) |
| { |
| |
| struct mei_me_client *me_cl; |
| |
| list_for_each_entry(me_cl, &dev->me_clients, list) |
| if (me_cl->client_id == client_id) |
| return me_cl; |
| return NULL; |
| } |
| |
| struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev, |
| const uuid_le *uuid, u8 client_id) |
| { |
| struct mei_me_client *me_cl; |
| |
| list_for_each_entry(me_cl, &dev->me_clients, list) |
| if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0 && |
| me_cl->client_id == client_id) |
| return me_cl; |
| return NULL; |
| } |
| |
| /** |
| * mei_me_cl_remove - remove me client matching uuid and client_id |
| * |
| * @dev: the device structure |
| * @uuid: me client uuid |
| * @client_id: me client address |
| */ |
| void mei_me_cl_remove(struct mei_device *dev, const uuid_le *uuid, u8 client_id) |
| { |
| struct mei_me_client *me_cl, *next; |
| |
| list_for_each_entry_safe(me_cl, next, &dev->me_clients, list) { |
| if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0 && |
| me_cl->client_id == client_id) { |
| list_del(&me_cl->list); |
| kfree(me_cl); |
| break; |
| } |
| } |
| } |
| |
| |
| /** |
| * mei_cl_cmp_id - tells if the clients are the same |
| * |
| * @cl1: host client 1 |
| * @cl2: host client 2 |
| * |
| * returns true - if the clients has same host and me ids |
| * false - otherwise |
| */ |
| static inline bool mei_cl_cmp_id(const struct mei_cl *cl1, |
| const struct mei_cl *cl2) |
| { |
| return cl1 && cl2 && |
| (cl1->host_client_id == cl2->host_client_id) && |
| (cl1->me_client_id == cl2->me_client_id); |
| } |
| |
| /** |
| * mei_io_list_flush - removes cbs belonging to cl. |
| * |
| * @list: an instance of our list structure |
| * @cl: host client, can be NULL for flushing the whole list |
| * @free: whether to free the cbs |
| */ |
| static void __mei_io_list_flush(struct mei_cl_cb *list, |
| struct mei_cl *cl, bool free) |
| { |
| struct mei_cl_cb *cb; |
| struct mei_cl_cb *next; |
| |
| /* enable removing everything if no cl is specified */ |
| list_for_each_entry_safe(cb, next, &list->list, list) { |
| if (!cl || (cb->cl && mei_cl_cmp_id(cl, cb->cl))) { |
| list_del(&cb->list); |
| if (free) |
| mei_io_cb_free(cb); |
| } |
| } |
| } |
| |
| /** |
| * mei_io_list_flush - removes list entry belonging to cl. |
| * |
| * @list: An instance of our list structure |
| * @cl: host client |
| */ |
| void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl) |
| { |
| __mei_io_list_flush(list, cl, false); |
| } |
| |
| |
| /** |
| * mei_io_list_free - removes cb belonging to cl and free them |
| * |
| * @list: An instance of our list structure |
| * @cl: host client |
| */ |
| static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl) |
| { |
| __mei_io_list_flush(list, cl, true); |
| } |
| |
| /** |
| * mei_io_cb_free - free mei_cb_private related memory |
| * |
| * @cb: mei callback struct |
| */ |
| void mei_io_cb_free(struct mei_cl_cb *cb) |
| { |
| if (cb == NULL) |
| return; |
| |
| kfree(cb->request_buffer.data); |
| kfree(cb->response_buffer.data); |
| kfree(cb); |
| } |
| |
| /** |
| * mei_io_cb_init - allocate and initialize io callback |
| * |
| * @cl - mei client |
| * @fp: pointer to file structure |
| * |
| * returns mei_cl_cb pointer or NULL; |
| */ |
| struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp) |
| { |
| struct mei_cl_cb *cb; |
| |
| cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); |
| if (!cb) |
| return NULL; |
| |
| mei_io_list_init(cb); |
| |
| cb->file_object = fp; |
| cb->cl = cl; |
| cb->buf_idx = 0; |
| return cb; |
| } |
| |
| /** |
| * mei_io_cb_alloc_req_buf - allocate request buffer |
| * |
| * @cb: io callback structure |
| * @length: size of the buffer |
| * |
| * returns 0 on success |
| * -EINVAL if cb is NULL |
| * -ENOMEM if allocation failed |
| */ |
| int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length) |
| { |
| if (!cb) |
| return -EINVAL; |
| |
| if (length == 0) |
| return 0; |
| |
| cb->request_buffer.data = kmalloc(length, GFP_KERNEL); |
| if (!cb->request_buffer.data) |
| return -ENOMEM; |
| cb->request_buffer.size = length; |
| return 0; |
| } |
| /** |
| * mei_io_cb_alloc_resp_buf - allocate response buffer |
| * |
| * @cb: io callback structure |
| * @length: size of the buffer |
| * |
| * returns 0 on success |
| * -EINVAL if cb is NULL |
| * -ENOMEM if allocation failed |
| */ |
| int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length) |
| { |
| if (!cb) |
| return -EINVAL; |
| |
| if (length == 0) |
| return 0; |
| |
| cb->response_buffer.data = kmalloc(length, GFP_KERNEL); |
| if (!cb->response_buffer.data) |
| return -ENOMEM; |
| cb->response_buffer.size = length; |
| return 0; |
| } |
| |
| |
| |
| /** |
| * mei_cl_flush_queues - flushes queue lists belonging to cl. |
| * |
| * @cl: host client |
| */ |
| int mei_cl_flush_queues(struct mei_cl *cl) |
| { |
| struct mei_device *dev; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -EINVAL; |
| |
| dev = cl->dev; |
| |
| cl_dbg(dev, cl, "remove list entry belonging to cl\n"); |
| mei_io_list_flush(&cl->dev->read_list, cl); |
| mei_io_list_free(&cl->dev->write_list, cl); |
| mei_io_list_free(&cl->dev->write_waiting_list, cl); |
| mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); |
| mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); |
| mei_io_list_flush(&cl->dev->amthif_cmd_list, cl); |
| mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl); |
| return 0; |
| } |
| |
| |
| /** |
| * mei_cl_init - initializes cl. |
| * |
| * @cl: host client to be initialized |
| * @dev: mei device |
| */ |
| void mei_cl_init(struct mei_cl *cl, struct mei_device *dev) |
| { |
| memset(cl, 0, sizeof(struct mei_cl)); |
| init_waitqueue_head(&cl->wait); |
| init_waitqueue_head(&cl->rx_wait); |
| init_waitqueue_head(&cl->tx_wait); |
| INIT_LIST_HEAD(&cl->link); |
| INIT_LIST_HEAD(&cl->device_link); |
| cl->reading_state = MEI_IDLE; |
| cl->writing_state = MEI_IDLE; |
| cl->dev = dev; |
| } |
| |
| /** |
| * mei_cl_allocate - allocates cl structure and sets it up. |
| * |
| * @dev: mei device |
| * returns The allocated file or NULL on failure |
| */ |
| struct mei_cl *mei_cl_allocate(struct mei_device *dev) |
| { |
| struct mei_cl *cl; |
| |
| cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); |
| if (!cl) |
| return NULL; |
| |
| mei_cl_init(cl, dev); |
| |
| return cl; |
| } |
| |
| /** |
| * mei_cl_find_read_cb - find this cl's callback in the read list |
| * |
| * @cl: host client |
| * |
| * returns cb on success, NULL on error |
| */ |
| struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl) |
| { |
| struct mei_device *dev = cl->dev; |
| struct mei_cl_cb *cb; |
| |
| list_for_each_entry(cb, &dev->read_list.list, list) |
| if (mei_cl_cmp_id(cl, cb->cl)) |
| return cb; |
| return NULL; |
| } |
| |
| /** mei_cl_link: allocate host id in the host map |
| * |
| * @cl - host client |
| * @id - fixed host id or -1 for generic one |
| * |
| * returns 0 on success |
| * -EINVAL on incorrect values |
| * -ENONET if client not found |
| */ |
| int mei_cl_link(struct mei_cl *cl, int id) |
| { |
| struct mei_device *dev; |
| long open_handle_count; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -EINVAL; |
| |
| dev = cl->dev; |
| |
| /* If Id is not assigned get one*/ |
| if (id == MEI_HOST_CLIENT_ID_ANY) |
| id = find_first_zero_bit(dev->host_clients_map, |
| MEI_CLIENTS_MAX); |
| |
| if (id >= MEI_CLIENTS_MAX) { |
| dev_err(&dev->pdev->dev, "id exceeded %d", MEI_CLIENTS_MAX); |
| return -EMFILE; |
| } |
| |
| open_handle_count = dev->open_handle_count + dev->iamthif_open_count; |
| if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) { |
| dev_err(&dev->pdev->dev, "open_handle_count exceeded %d", |
| MEI_MAX_OPEN_HANDLE_COUNT); |
| return -EMFILE; |
| } |
| |
| dev->open_handle_count++; |
| |
| cl->host_client_id = id; |
| list_add_tail(&cl->link, &dev->file_list); |
| |
| set_bit(id, dev->host_clients_map); |
| |
| cl->state = MEI_FILE_INITIALIZING; |
| |
| cl_dbg(dev, cl, "link cl\n"); |
| return 0; |
| } |
| |
| /** |
| * mei_cl_unlink - remove me_cl from the list |
| * |
| * @cl: host client |
| */ |
| int mei_cl_unlink(struct mei_cl *cl) |
| { |
| struct mei_device *dev; |
| |
| /* don't shout on error exit path */ |
| if (!cl) |
| return 0; |
| |
| /* wd and amthif might not be initialized */ |
| if (!cl->dev) |
| return 0; |
| |
| dev = cl->dev; |
| |
| cl_dbg(dev, cl, "unlink client"); |
| |
| if (dev->open_handle_count > 0) |
| dev->open_handle_count--; |
| |
| /* never clear the 0 bit */ |
| if (cl->host_client_id) |
| clear_bit(cl->host_client_id, dev->host_clients_map); |
| |
| list_del_init(&cl->link); |
| |
| cl->state = MEI_FILE_INITIALIZING; |
| |
| return 0; |
| } |
| |
| |
| void mei_host_client_init(struct work_struct *work) |
| { |
| struct mei_device *dev = container_of(work, |
| struct mei_device, init_work); |
| struct mei_me_client *me_cl; |
| struct mei_client_properties *props; |
| |
| mutex_lock(&dev->device_lock); |
| |
| list_for_each_entry(me_cl, &dev->me_clients, list) { |
| props = &me_cl->props; |
| |
| if (!uuid_le_cmp(props->protocol_name, mei_amthif_guid)) |
| mei_amthif_host_init(dev); |
| else if (!uuid_le_cmp(props->protocol_name, mei_wd_guid)) |
| mei_wd_host_init(dev); |
| else if (!uuid_le_cmp(props->protocol_name, mei_nfc_guid)) |
| mei_nfc_host_init(dev); |
| |
| } |
| |
| dev->dev_state = MEI_DEV_ENABLED; |
| dev->reset_count = 0; |
| |
| mutex_unlock(&dev->device_lock); |
| |
| pm_runtime_mark_last_busy(&dev->pdev->dev); |
| dev_dbg(&dev->pdev->dev, "rpm: autosuspend\n"); |
| pm_runtime_autosuspend(&dev->pdev->dev); |
| } |
| |
| /** |
| * mei_hbuf_acquire: try to acquire host buffer |
| * |
| * @dev: the device structure |
| * returns true if host buffer was acquired |
| */ |
| bool mei_hbuf_acquire(struct mei_device *dev) |
| { |
| if (mei_pg_state(dev) == MEI_PG_ON || |
| dev->pg_event == MEI_PG_EVENT_WAIT) { |
| dev_dbg(&dev->pdev->dev, "device is in pg\n"); |
| return false; |
| } |
| |
| if (!dev->hbuf_is_ready) { |
| dev_dbg(&dev->pdev->dev, "hbuf is not ready\n"); |
| return false; |
| } |
| |
| dev->hbuf_is_ready = false; |
| |
| return true; |
| } |
| |
| /** |
| * mei_cl_disconnect - disconnect host client from the me one |
| * |
| * @cl: host client |
| * |
| * Locking: called under "dev->device_lock" lock |
| * |
| * returns 0 on success, <0 on failure. |
| */ |
| int mei_cl_disconnect(struct mei_cl *cl) |
| { |
| struct mei_device *dev; |
| struct mei_cl_cb *cb; |
| int rets; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -ENODEV; |
| |
| dev = cl->dev; |
| |
| cl_dbg(dev, cl, "disconnecting"); |
| |
| if (cl->state != MEI_FILE_DISCONNECTING) |
| return 0; |
| |
| rets = pm_runtime_get(&dev->pdev->dev); |
| if (rets < 0 && rets != -EINPROGRESS) { |
| pm_runtime_put_noidle(&dev->pdev->dev); |
| cl_err(dev, cl, "rpm: get failed %d\n", rets); |
| return rets; |
| } |
| |
| cb = mei_io_cb_init(cl, NULL); |
| if (!cb) { |
| rets = -ENOMEM; |
| goto free; |
| } |
| |
| cb->fop_type = MEI_FOP_DISCONNECT; |
| |
| if (mei_hbuf_acquire(dev)) { |
| if (mei_hbm_cl_disconnect_req(dev, cl)) { |
| rets = -ENODEV; |
| cl_err(dev, cl, "failed to disconnect.\n"); |
| goto free; |
| } |
| cl->timer_count = MEI_CONNECT_TIMEOUT; |
| mdelay(10); /* Wait for hardware disconnection ready */ |
| list_add_tail(&cb->list, &dev->ctrl_rd_list.list); |
| } else { |
| cl_dbg(dev, cl, "add disconnect cb to control write list\n"); |
| list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
| |
| } |
| mutex_unlock(&dev->device_lock); |
| |
| wait_event_timeout(cl->wait, |
| MEI_FILE_DISCONNECTED == cl->state, |
| mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
| |
| mutex_lock(&dev->device_lock); |
| |
| if (MEI_FILE_DISCONNECTED == cl->state) { |
| rets = 0; |
| cl_dbg(dev, cl, "successfully disconnected from FW client.\n"); |
| } else { |
| cl_dbg(dev, cl, "timeout on disconnect from FW client.\n"); |
| rets = -ETIME; |
| } |
| |
| mei_io_list_flush(&dev->ctrl_rd_list, cl); |
| mei_io_list_flush(&dev->ctrl_wr_list, cl); |
| free: |
| cl_dbg(dev, cl, "rpm: autosuspend\n"); |
| pm_runtime_mark_last_busy(&dev->pdev->dev); |
| pm_runtime_put_autosuspend(&dev->pdev->dev); |
| |
| mei_io_cb_free(cb); |
| return rets; |
| } |
| |
| |
| /** |
| * mei_cl_is_other_connecting - checks if other |
| * client with the same me client id is connecting |
| * |
| * @cl: private data of the file object |
| * |
| * returns true if other client is connected, false - otherwise. |
| */ |
| bool mei_cl_is_other_connecting(struct mei_cl *cl) |
| { |
| struct mei_device *dev; |
| struct mei_cl *ocl; /* the other client */ |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return false; |
| |
| dev = cl->dev; |
| |
| list_for_each_entry(ocl, &dev->file_list, link) { |
| if (ocl->state == MEI_FILE_CONNECTING && |
| ocl != cl && |
| cl->me_client_id == ocl->me_client_id) |
| return true; |
| |
| } |
| |
| return false; |
| } |
| |
| /** |
| * mei_cl_connect - connect host client to the me one |
| * |
| * @cl: host client |
| * |
| * Locking: called under "dev->device_lock" lock |
| * |
| * returns 0 on success, <0 on failure. |
| */ |
| int mei_cl_connect(struct mei_cl *cl, struct file *file) |
| { |
| struct mei_device *dev; |
| struct mei_cl_cb *cb; |
| int rets; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -ENODEV; |
| |
| dev = cl->dev; |
| |
| rets = pm_runtime_get(&dev->pdev->dev); |
| if (rets < 0 && rets != -EINPROGRESS) { |
| pm_runtime_put_noidle(&dev->pdev->dev); |
| cl_err(dev, cl, "rpm: get failed %d\n", rets); |
| return rets; |
| } |
| |
| cb = mei_io_cb_init(cl, file); |
| if (!cb) { |
| rets = -ENOMEM; |
| goto out; |
| } |
| |
| cb->fop_type = MEI_FOP_CONNECT; |
| |
| /* run hbuf acquire last so we don't have to undo */ |
| if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) { |
| cl->state = MEI_FILE_CONNECTING; |
| if (mei_hbm_cl_connect_req(dev, cl)) { |
| rets = -ENODEV; |
| goto out; |
| } |
| cl->timer_count = MEI_CONNECT_TIMEOUT; |
| list_add_tail(&cb->list, &dev->ctrl_rd_list.list); |
| } else { |
| cl->state = MEI_FILE_INITIALIZING; |
| list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
| } |
| |
| mutex_unlock(&dev->device_lock); |
| wait_event_timeout(cl->wait, |
| (cl->state == MEI_FILE_CONNECTED || |
| cl->state == MEI_FILE_DISCONNECTED), |
| mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
| mutex_lock(&dev->device_lock); |
| |
| if (cl->state != MEI_FILE_CONNECTED) { |
| cl->state = MEI_FILE_DISCONNECTED; |
| /* something went really wrong */ |
| if (!cl->status) |
| cl->status = -EFAULT; |
| |
| mei_io_list_flush(&dev->ctrl_rd_list, cl); |
| mei_io_list_flush(&dev->ctrl_wr_list, cl); |
| } |
| |
| rets = cl->status; |
| |
| out: |
| cl_dbg(dev, cl, "rpm: autosuspend\n"); |
| pm_runtime_mark_last_busy(&dev->pdev->dev); |
| pm_runtime_put_autosuspend(&dev->pdev->dev); |
| |
| mei_io_cb_free(cb); |
| return rets; |
| } |
| |
| /** |
| * mei_cl_flow_ctrl_creds - checks flow_control credits for cl. |
| * |
| * @cl: private data of the file object |
| * |
| * returns 1 if mei_flow_ctrl_creds >0, 0 - otherwise. |
| * -ENOENT if mei_cl is not present |
| * -EINVAL if single_recv_buf == 0 |
| */ |
| int mei_cl_flow_ctrl_creds(struct mei_cl *cl) |
| { |
| struct mei_device *dev; |
| struct mei_me_client *me_cl; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -EINVAL; |
| |
| dev = cl->dev; |
| |
| if (cl->mei_flow_ctrl_creds > 0) |
| return 1; |
| |
| me_cl = mei_me_cl_by_id(dev, cl->me_client_id); |
| if (!me_cl) { |
| cl_err(dev, cl, "no such me client %d\n", cl->me_client_id); |
| return -ENOENT; |
| } |
| |
| if (me_cl->mei_flow_ctrl_creds) { |
| if (WARN_ON(me_cl->props.single_recv_buf == 0)) |
| return -EINVAL; |
| return 1; |
| } |
| return 0; |
| } |
| |
| /** |
| * mei_cl_flow_ctrl_reduce - reduces flow_control. |
| * |
| * @cl: private data of the file object |
| * |
| * @returns |
| * 0 on success |
| * -ENOENT when me client is not found |
| * -EINVAL when ctrl credits are <= 0 |
| */ |
| int mei_cl_flow_ctrl_reduce(struct mei_cl *cl) |
| { |
| struct mei_device *dev; |
| struct mei_me_client *me_cl; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -EINVAL; |
| |
| dev = cl->dev; |
| |
| me_cl = mei_me_cl_by_id(dev, cl->me_client_id); |
| if (!me_cl) { |
| cl_err(dev, cl, "no such me client %d\n", cl->me_client_id); |
| return -ENOENT; |
| } |
| |
| if (me_cl->props.single_recv_buf) { |
| if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0)) |
| return -EINVAL; |
| me_cl->mei_flow_ctrl_creds--; |
| } else { |
| if (WARN_ON(cl->mei_flow_ctrl_creds <= 0)) |
| return -EINVAL; |
| cl->mei_flow_ctrl_creds--; |
| } |
| return 0; |
| } |
| |
| /** |
| * mei_cl_read_start - the start read client message function. |
| * |
| * @cl: host client |
| * |
| * returns 0 on success, <0 on failure. |
| */ |
| int mei_cl_read_start(struct mei_cl *cl, size_t length) |
| { |
| struct mei_device *dev; |
| struct mei_cl_cb *cb; |
| struct mei_me_client *me_cl; |
| int rets; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -ENODEV; |
| |
| dev = cl->dev; |
| |
| if (!mei_cl_is_connected(cl)) |
| return -ENODEV; |
| |
| if (cl->read_cb) { |
| cl_dbg(dev, cl, "read is pending.\n"); |
| return -EBUSY; |
| } |
| me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id); |
| if (!me_cl) { |
| cl_err(dev, cl, "no such me client %d\n", cl->me_client_id); |
| return -ENOTTY; |
| } |
| |
| rets = pm_runtime_get(&dev->pdev->dev); |
| if (rets < 0 && rets != -EINPROGRESS) { |
| pm_runtime_put_noidle(&dev->pdev->dev); |
| cl_err(dev, cl, "rpm: get failed %d\n", rets); |
| return rets; |
| } |
| |
| cb = mei_io_cb_init(cl, NULL); |
| if (!cb) { |
| rets = -ENOMEM; |
| goto out; |
| } |
| |
| /* always allocate at least client max message */ |
| length = max_t(size_t, length, me_cl->props.max_msg_length); |
| rets = mei_io_cb_alloc_resp_buf(cb, length); |
| if (rets) |
| goto out; |
| |
| cb->fop_type = MEI_FOP_READ; |
| if (mei_hbuf_acquire(dev)) { |
| rets = mei_hbm_cl_flow_control_req(dev, cl); |
| if (rets < 0) |
| goto out; |
| |
| list_add_tail(&cb->list, &dev->read_list.list); |
| } else { |
| list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
| } |
| |
| cl->read_cb = cb; |
| |
| out: |
| cl_dbg(dev, cl, "rpm: autosuspend\n"); |
| pm_runtime_mark_last_busy(&dev->pdev->dev); |
| pm_runtime_put_autosuspend(&dev->pdev->dev); |
| |
| if (rets) |
| mei_io_cb_free(cb); |
| |
| return rets; |
| } |
| |
| /** |
| * mei_cl_irq_write - write a message to device |
| * from the interrupt thread context |
| * |
| * @cl: client |
| * @cb: callback block. |
| * @cmpl_list: complete list. |
| * |
| * returns 0, OK; otherwise error. |
| */ |
| int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb, |
| struct mei_cl_cb *cmpl_list) |
| { |
| struct mei_device *dev; |
| struct mei_msg_data *buf; |
| struct mei_msg_hdr mei_hdr; |
| size_t len; |
| u32 msg_slots; |
| int slots; |
| int rets; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -ENODEV; |
| |
| dev = cl->dev; |
| |
| buf = &cb->request_buffer; |
| |
| rets = mei_cl_flow_ctrl_creds(cl); |
| if (rets < 0) |
| return rets; |
| |
| if (rets == 0) { |
| cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); |
| return 0; |
| } |
| |
| slots = mei_hbuf_empty_slots(dev); |
| len = buf->size - cb->buf_idx; |
| msg_slots = mei_data2slots(len); |
| |
| mei_hdr.host_addr = cl->host_client_id; |
| mei_hdr.me_addr = cl->me_client_id; |
| mei_hdr.reserved = 0; |
| mei_hdr.internal = cb->internal; |
| |
| if (slots >= msg_slots) { |
| mei_hdr.length = len; |
| mei_hdr.msg_complete = 1; |
| /* Split the message only if we can write the whole host buffer */ |
| } else if (slots == dev->hbuf_depth) { |
| msg_slots = slots; |
| len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr); |
| mei_hdr.length = len; |
| mei_hdr.msg_complete = 0; |
| } else { |
| /* wait for next time the host buffer is empty */ |
| return 0; |
| } |
| |
| cl_dbg(dev, cl, "buf: size = %d idx = %lu\n", |
| cb->request_buffer.size, cb->buf_idx); |
| |
| rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx); |
| if (rets) { |
| cl->status = rets; |
| list_move_tail(&cb->list, &cmpl_list->list); |
| return rets; |
| } |
| |
| cl->status = 0; |
| cl->writing_state = MEI_WRITING; |
| cb->buf_idx += mei_hdr.length; |
| |
| if (mei_hdr.msg_complete) { |
| if (mei_cl_flow_ctrl_reduce(cl)) |
| return -EIO; |
| list_move_tail(&cb->list, &dev->write_waiting_list.list); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * mei_cl_write - submit a write cb to mei device |
| assumes device_lock is locked |
| * |
| * @cl: host client |
| * @cl: write callback with filled data |
| * |
| * returns number of bytes sent on success, <0 on failure. |
| */ |
| int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking) |
| { |
| struct mei_device *dev; |
| struct mei_msg_data *buf; |
| struct mei_msg_hdr mei_hdr; |
| int rets; |
| |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -ENODEV; |
| |
| if (WARN_ON(!cb)) |
| return -EINVAL; |
| |
| dev = cl->dev; |
| |
| |
| buf = &cb->request_buffer; |
| |
| cl_dbg(dev, cl, "mei_cl_write %d\n", buf->size); |
| |
| rets = pm_runtime_get(&dev->pdev->dev); |
| if (rets < 0 && rets != -EINPROGRESS) { |
| pm_runtime_put_noidle(&dev->pdev->dev); |
| cl_err(dev, cl, "rpm: get failed %d\n", rets); |
| return rets; |
| } |
| |
| cb->fop_type = MEI_FOP_WRITE; |
| cb->buf_idx = 0; |
| cl->writing_state = MEI_IDLE; |
| |
| mei_hdr.host_addr = cl->host_client_id; |
| mei_hdr.me_addr = cl->me_client_id; |
| mei_hdr.reserved = 0; |
| mei_hdr.msg_complete = 0; |
| mei_hdr.internal = cb->internal; |
| |
| rets = mei_cl_flow_ctrl_creds(cl); |
| if (rets < 0) |
| goto err; |
| |
| if (rets == 0) { |
| cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); |
| rets = buf->size; |
| goto out; |
| } |
| if (!mei_hbuf_acquire(dev)) { |
| cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n"); |
| rets = buf->size; |
| goto out; |
| } |
| |
| /* Check for a maximum length */ |
| if (buf->size > mei_hbuf_max_len(dev)) { |
| mei_hdr.length = mei_hbuf_max_len(dev); |
| mei_hdr.msg_complete = 0; |
| } else { |
| mei_hdr.length = buf->size; |
| mei_hdr.msg_complete = 1; |
| } |
| |
| rets = mei_write_message(dev, &mei_hdr, buf->data); |
| if (rets) |
| goto err; |
| |
| cl->writing_state = MEI_WRITING; |
| cb->buf_idx = mei_hdr.length; |
| |
| out: |
| if (mei_hdr.msg_complete) { |
| rets = mei_cl_flow_ctrl_reduce(cl); |
| if (rets < 0) |
| goto err; |
| |
| list_add_tail(&cb->list, &dev->write_waiting_list.list); |
| } else { |
| list_add_tail(&cb->list, &dev->write_list.list); |
| } |
| |
| |
| if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) { |
| |
| mutex_unlock(&dev->device_lock); |
| rets = wait_event_interruptible(cl->tx_wait, |
| cl->writing_state == MEI_WRITE_COMPLETE); |
| mutex_lock(&dev->device_lock); |
| /* wait_event_interruptible returns -ERESTARTSYS */ |
| if (rets) { |
| if (signal_pending(current)) |
| rets = -EINTR; |
| goto err; |
| } |
| } |
| |
| rets = buf->size; |
| err: |
| cl_dbg(dev, cl, "rpm: autosuspend\n"); |
| pm_runtime_mark_last_busy(&dev->pdev->dev); |
| pm_runtime_put_autosuspend(&dev->pdev->dev); |
| |
| return rets; |
| } |
| |
| |
| /** |
| * mei_cl_complete - processes completed operation for a client |
| * |
| * @cl: private data of the file object. |
| * @cb: callback block. |
| */ |
| void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) |
| { |
| if (cb->fop_type == MEI_FOP_WRITE) { |
| mei_io_cb_free(cb); |
| cb = NULL; |
| cl->writing_state = MEI_WRITE_COMPLETE; |
| if (waitqueue_active(&cl->tx_wait)) |
| wake_up_interruptible(&cl->tx_wait); |
| |
| } else if (cb->fop_type == MEI_FOP_READ && |
| MEI_READING == cl->reading_state) { |
| cl->reading_state = MEI_READ_COMPLETE; |
| if (waitqueue_active(&cl->rx_wait)) |
| wake_up_interruptible(&cl->rx_wait); |
| else |
| mei_cl_bus_rx_event(cl); |
| |
| } |
| } |
| |
| |
| /** |
| * mei_cl_all_disconnect - disconnect forcefully all connected clients |
| * |
| * @dev - mei device |
| */ |
| |
| void mei_cl_all_disconnect(struct mei_device *dev) |
| { |
| struct mei_cl *cl; |
| |
| list_for_each_entry(cl, &dev->file_list, link) { |
| cl->state = MEI_FILE_DISCONNECTED; |
| cl->mei_flow_ctrl_creds = 0; |
| cl->timer_count = 0; |
| } |
| } |
| |
| |
| /** |
| * mei_cl_all_wakeup - wake up all readers and writers they can be interrupted |
| * |
| * @dev - mei device |
| */ |
| void mei_cl_all_wakeup(struct mei_device *dev) |
| { |
| struct mei_cl *cl; |
| list_for_each_entry(cl, &dev->file_list, link) { |
| if (waitqueue_active(&cl->rx_wait)) { |
| cl_dbg(dev, cl, "Waking up reading client!\n"); |
| wake_up_interruptible(&cl->rx_wait); |
| } |
| if (waitqueue_active(&cl->tx_wait)) { |
| cl_dbg(dev, cl, "Waking up writing client!\n"); |
| wake_up_interruptible(&cl->tx_wait); |
| } |
| } |
| } |
| |
| /** |
| * mei_cl_all_write_clear - clear all pending writes |
| |
| * @dev - mei device |
| */ |
| void mei_cl_all_write_clear(struct mei_device *dev) |
| { |
| mei_io_list_free(&dev->write_list, NULL); |
| mei_io_list_free(&dev->write_waiting_list, NULL); |
| } |
| |
| |