From 8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Tue, 15 Dec 2015 14:52:16 -0300 Subject: Linux-libre 4.3.2-gnu --- drivers/misc/mei/client.c | 333 ++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 292 insertions(+), 41 deletions(-) (limited to 'drivers/misc/mei/client.c') diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index 6decbe136..a6c87c713 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -555,10 +555,10 @@ void mei_cl_init(struct mei_cl *cl, struct mei_device *dev) init_waitqueue_head(&cl->wait); init_waitqueue_head(&cl->rx_wait); init_waitqueue_head(&cl->tx_wait); + init_waitqueue_head(&cl->ev_wait); INIT_LIST_HEAD(&cl->rd_completed); INIT_LIST_HEAD(&cl->rd_pending); INIT_LIST_HEAD(&cl->link); - INIT_LIST_HEAD(&cl->device_link); cl->writing_state = MEI_IDLE; cl->state = MEI_FILE_INITIALIZING; cl->dev = dev; @@ -690,16 +690,12 @@ void mei_host_client_init(struct work_struct *work) mei_wd_host_init(dev, me_cl); mei_me_cl_put(me_cl); - me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid); - if (me_cl) - mei_nfc_host_init(dev, me_cl); - mei_me_cl_put(me_cl); - - dev->dev_state = MEI_DEV_ENABLED; dev->reset_count = 0; mutex_unlock(&dev->device_lock); + mei_cl_bus_rescan(dev); + pm_runtime_mark_last_busy(dev->dev); dev_dbg(dev->dev, "rpm: autosuspend\n"); pm_runtime_autosuspend(dev->dev); @@ -841,45 +837,22 @@ int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb, return ret; } - - /** - * mei_cl_disconnect - disconnect host client from the me one + * __mei_cl_disconnect - disconnect host client from the me one + * internal function runtime pm has to be already acquired * * @cl: host client * - * Locking: called under "dev->device_lock" lock - * * Return: 0 on success, <0 on failure. */ -int mei_cl_disconnect(struct mei_cl *cl) +static 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 (!mei_cl_is_connected(cl)) - return 0; - - if (mei_cl_is_fixed_address(cl)) { - mei_cl_set_disconnected(cl); - return 0; - } - - rets = pm_runtime_get(dev->dev); - if (rets < 0 && rets != -EINPROGRESS) { - pm_runtime_put_noidle(dev->dev); - cl_err(dev, cl, "rpm: get failed %d\n", rets); - return rets; - } - cl->state = MEI_FILE_DISCONNECTING; cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL); @@ -915,11 +888,52 @@ out: if (!rets) cl_dbg(dev, cl, "successfully disconnected from FW client.\n"); + mei_io_cb_free(cb); + return rets; +} + +/** + * mei_cl_disconnect - disconnect host client from the me one + * + * @cl: host client + * + * Locking: called under "dev->device_lock" lock + * + * Return: 0 on success, <0 on failure. + */ +int mei_cl_disconnect(struct mei_cl *cl) +{ + struct mei_device *dev; + int rets; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + cl_dbg(dev, cl, "disconnecting"); + + if (!mei_cl_is_connected(cl)) + return 0; + + if (mei_cl_is_fixed_address(cl)) { + mei_cl_set_disconnected(cl); + return 0; + } + + rets = pm_runtime_get(dev->dev); + if (rets < 0 && rets != -EINPROGRESS) { + pm_runtime_put_noidle(dev->dev); + cl_err(dev, cl, "rpm: get failed %d\n", rets); + return rets; + } + + rets = __mei_cl_disconnect(cl); + cl_dbg(dev, cl, "rpm: autosuspend\n"); pm_runtime_mark_last_busy(dev->dev); pm_runtime_put_autosuspend(dev->dev); - mei_io_cb_free(cb); return rets; } @@ -1064,11 +1078,23 @@ int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl, mutex_unlock(&dev->device_lock); wait_event_timeout(cl->wait, (cl->state == MEI_FILE_CONNECTED || + cl->state == MEI_FILE_DISCONNECT_REQUIRED || cl->state == MEI_FILE_DISCONNECT_REPLY), mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); mutex_lock(&dev->device_lock); if (!mei_cl_is_connected(cl)) { + if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) { + mei_io_list_flush(&dev->ctrl_rd_list, cl); + mei_io_list_flush(&dev->ctrl_wr_list, cl); + /* ignore disconnect return valuue; + * in case of failure reset will be invoked + */ + __mei_cl_disconnect(cl); + rets = -EFAULT; + goto out; + } + /* timeout or something went really wrong */ if (!cl->status) cl->status = -EFAULT; @@ -1180,6 +1206,221 @@ int mei_cl_flow_ctrl_reduce(struct mei_cl *cl) return 0; } +/** + * mei_cl_notify_fop2req - convert fop to proper request + * + * @fop: client notification start response command + * + * Return: MEI_HBM_NOTIFICATION_START/STOP + */ +u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop) +{ + if (fop == MEI_FOP_NOTIFY_START) + return MEI_HBM_NOTIFICATION_START; + else + return MEI_HBM_NOTIFICATION_STOP; +} + +/** + * mei_cl_notify_req2fop - convert notification request top file operation type + * + * @req: hbm notification request type + * + * Return: MEI_FOP_NOTIFY_START/STOP + */ +enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req) +{ + if (req == MEI_HBM_NOTIFICATION_START) + return MEI_FOP_NOTIFY_START; + else + return MEI_FOP_NOTIFY_STOP; +} + +/** + * mei_cl_irq_notify - send notification request in irq_thread context + * + * @cl: client + * @cb: callback block. + * @cmpl_list: complete list. + * + * Return: 0 on such and error otherwise. + */ +int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb, + struct mei_cl_cb *cmpl_list) +{ + struct mei_device *dev = cl->dev; + u32 msg_slots; + int slots; + int ret; + bool request; + + msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); + slots = mei_hbuf_empty_slots(dev); + + if (slots < msg_slots) + return -EMSGSIZE; + + request = mei_cl_notify_fop2req(cb->fop_type); + ret = mei_hbm_cl_notify_req(dev, cl, request); + if (ret) { + cl->status = ret; + list_move_tail(&cb->list, &cmpl_list->list); + return ret; + } + + list_move_tail(&cb->list, &dev->ctrl_rd_list.list); + return 0; +} + +/** + * mei_cl_notify_request - send notification stop/start request + * + * @cl: host client + * @file: associate request with file + * @request: 1 for start or 0 for stop + * + * Locking: called under "dev->device_lock" lock + * + * Return: 0 on such and error otherwise. + */ +int mei_cl_notify_request(struct mei_cl *cl, struct file *file, u8 request) +{ + struct mei_device *dev; + struct mei_cl_cb *cb; + enum mei_cb_file_ops fop_type; + int rets; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + if (!dev->hbm_f_ev_supported) { + cl_dbg(dev, cl, "notifications not supported\n"); + return -EOPNOTSUPP; + } + + rets = pm_runtime_get(dev->dev); + if (rets < 0 && rets != -EINPROGRESS) { + pm_runtime_put_noidle(dev->dev); + cl_err(dev, cl, "rpm: get failed %d\n", rets); + return rets; + } + + fop_type = mei_cl_notify_req2fop(request); + cb = mei_io_cb_init(cl, fop_type, file); + if (!cb) { + rets = -ENOMEM; + goto out; + } + + if (mei_hbuf_acquire(dev)) { + if (mei_hbm_cl_notify_req(dev, cl, request)) { + rets = -ENODEV; + goto out; + } + list_add_tail(&cb->list, &dev->ctrl_rd_list.list); + } else { + list_add_tail(&cb->list, &dev->ctrl_wr_list.list); + } + + mutex_unlock(&dev->device_lock); + wait_event_timeout(cl->wait, cl->notify_en == request, + mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); + mutex_lock(&dev->device_lock); + + if (cl->notify_en != request) { + mei_io_list_flush(&dev->ctrl_rd_list, cl); + mei_io_list_flush(&dev->ctrl_wr_list, cl); + if (!cl->status) + cl->status = -EFAULT; + } + + rets = cl->status; + +out: + cl_dbg(dev, cl, "rpm: autosuspend\n"); + pm_runtime_mark_last_busy(dev->dev); + pm_runtime_put_autosuspend(dev->dev); + + mei_io_cb_free(cb); + return rets; +} + +/** + * mei_cl_notify - raise notification + * + * @cl: host client + * + * Locking: called under "dev->device_lock" lock + */ +void mei_cl_notify(struct mei_cl *cl) +{ + struct mei_device *dev; + + if (!cl || !cl->dev) + return; + + dev = cl->dev; + + if (!cl->notify_en) + return; + + cl_dbg(dev, cl, "notify event"); + cl->notify_ev = true; + wake_up_interruptible_all(&cl->ev_wait); + + if (cl->ev_async) + kill_fasync(&cl->ev_async, SIGIO, POLL_PRI); + + mei_cl_bus_notify_event(cl); +} + +/** + * mei_cl_notify_get - get or wait for notification event + * + * @cl: host client + * @block: this request is blocking + * @notify_ev: true if notification event was received + * + * Locking: called under "dev->device_lock" lock + * + * Return: 0 on such and error otherwise. + */ +int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev) +{ + struct mei_device *dev; + int rets; + + *notify_ev = false; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + if (!mei_cl_is_connected(cl)) + return -ENODEV; + + if (cl->notify_ev) + goto out; + + if (!block) + return -EAGAIN; + + mutex_unlock(&dev->device_lock); + rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev); + mutex_lock(&dev->device_lock); + + if (rets < 0) + return rets; + +out: + *notify_ev = cl->notify_ev; + cl->notify_ev = false; + return 0; +} + /** * mei_cl_read_start - the start read client message function. * @@ -1356,6 +1597,7 @@ 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 size; int rets; @@ -1367,10 +1609,10 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking) dev = cl->dev; - buf = &cb->buf; + size = buf->size; - cl_dbg(dev, cl, "size=%d\n", buf->size); + cl_dbg(dev, cl, "size=%d\n", size); rets = pm_runtime_get(dev->dev); if (rets < 0 && rets != -EINPROGRESS) { @@ -1394,21 +1636,21 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking) if (rets == 0) { cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); - rets = buf->size; + rets = size; goto out; } if (!mei_hbuf_acquire(dev)) { cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n"); - rets = buf->size; + rets = size; goto out; } /* Check for a maximum length */ - if (buf->size > mei_hbuf_max_len(dev)) { + if (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.length = size; mei_hdr.msg_complete = 1; } @@ -1430,6 +1672,7 @@ out: else list_add_tail(&cb->list, &dev->write_list.list); + cb = NULL; if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) { mutex_unlock(&dev->device_lock); @@ -1444,7 +1687,7 @@ out: } } - rets = buf->size; + rets = size; err: cl_dbg(dev, cl, "rpm: autosuspend\n"); pm_runtime_mark_last_busy(dev->dev); @@ -1486,6 +1729,8 @@ void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) case MEI_FOP_CONNECT: case MEI_FOP_DISCONNECT: + case MEI_FOP_NOTIFY_STOP: + case MEI_FOP_NOTIFY_START: if (waitqueue_active(&cl->wait)) wake_up(&cl->wait); @@ -1528,6 +1773,12 @@ void mei_cl_all_wakeup(struct mei_device *dev) cl_dbg(dev, cl, "Waking up writing client!\n"); wake_up_interruptible(&cl->tx_wait); } + + /* synchronized under device mutex */ + if (waitqueue_active(&cl->ev_wait)) { + cl_dbg(dev, cl, "Waking up waiting for event clients!\n"); + wake_up_interruptible(&cl->ev_wait); + } } } -- cgit v1.2.3-54-g00ecf