From 7c7a6077f5c7a35fc03a7f452875d8440dd1bc8d Mon Sep 17 00:00:00 2001 From: Alexander Usyskin Date: Wed, 16 Nov 2016 22:51:29 +0200 Subject: [PATCH] mei: bus: split RX and async notification callbacks Split callbacks for RX and async notification events on mei bus to eliminate synchronization problems and to open way for RX optimizations. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/bus.c | 141 +++++++++++++++++++++---------------- drivers/misc/mei/client.c | 5 ++ drivers/nfc/mei_phy.c | 36 +++++----- drivers/watchdog/mei_wdt.c | 36 +++------- include/linux/mei_cl_bus.h | 32 ++++----- 5 files changed, 128 insertions(+), 122 deletions(-) diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 483587f60249..2fd254ecde2f 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -209,31 +209,40 @@ ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length) EXPORT_SYMBOL_GPL(mei_cldev_recv); /** - * mei_cl_bus_event_work - dispatch rx event for a bus device - * and schedule new work + * mei_cl_bus_rx_work - dispatch rx event for a bus device * * @work: work */ -static void mei_cl_bus_event_work(struct work_struct *work) +static void mei_cl_bus_rx_work(struct work_struct *work) { struct mei_cl_device *cldev; struct mei_device *bus; - cldev = container_of(work, struct mei_cl_device, event_work); + cldev = container_of(work, struct mei_cl_device, rx_work); bus = cldev->bus; - if (cldev->event_cb) - cldev->event_cb(cldev, cldev->events); + if (cldev->rx_cb) + cldev->rx_cb(cldev); - cldev->events = 0; + mutex_lock(&bus->device_lock); + mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); + mutex_unlock(&bus->device_lock); +} - /* Prepare for the next read */ - if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) { - mutex_lock(&bus->device_lock); - mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); - mutex_unlock(&bus->device_lock); - } +/** + * mei_cl_bus_notif_work - dispatch FW notif event for a bus device + * + * @work: work + */ +static void mei_cl_bus_notif_work(struct work_struct *work) +{ + struct mei_cl_device *cldev; + + cldev = container_of(work, struct mei_cl_device, notif_work); + + if (cldev->notif_cb) + cldev->notif_cb(cldev); } /** @@ -248,18 +257,13 @@ bool mei_cl_bus_notify_event(struct mei_cl *cl) { struct mei_cl_device *cldev = cl->cldev; - if (!cldev || !cldev->event_cb) - return false; - - if (!(cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF))) + if (!cldev || !cldev->notif_cb) return false; if (!cl->notify_ev) return false; - set_bit(MEI_CL_EVENT_NOTIF, &cldev->events); - - schedule_work(&cldev->event_work); + schedule_work(&cldev->notif_work); cl->notify_ev = false; @@ -267,7 +271,7 @@ bool mei_cl_bus_notify_event(struct mei_cl *cl) } /** - * mei_cl_bus_rx_event - schedule rx event + * mei_cl_bus_rx_event - schedule rx event * * @cl: host client * @@ -278,64 +282,81 @@ bool mei_cl_bus_rx_event(struct mei_cl *cl) { struct mei_cl_device *cldev = cl->cldev; - if (!cldev || !cldev->event_cb) - return false; - - if (!(cldev->events_mask & BIT(MEI_CL_EVENT_RX))) + if (!cldev || !cldev->rx_cb) return false; - set_bit(MEI_CL_EVENT_RX, &cldev->events); - - schedule_work(&cldev->event_work); + schedule_work(&cldev->rx_work); return true; } /** - * mei_cldev_register_event_cb - register event callback + * mei_cldev_register_rx_cb - register Rx event callback * * @cldev: me client devices - * @event_cb: callback function - * @events_mask: requested events bitmask + * @rx_cb: callback function * * Return: 0 on success * -EALREADY if an callback is already registered * <0 on other errors */ -int mei_cldev_register_event_cb(struct mei_cl_device *cldev, - unsigned long events_mask, - mei_cldev_event_cb_t event_cb) +int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb) { struct mei_device *bus = cldev->bus; int ret; - if (cldev->event_cb) + if (!rx_cb) + return -EINVAL; + if (cldev->rx_cb) return -EALREADY; - cldev->events = 0; - cldev->events_mask = events_mask; - cldev->event_cb = event_cb; - INIT_WORK(&cldev->event_work, mei_cl_bus_event_work); + cldev->rx_cb = rx_cb; + INIT_WORK(&cldev->rx_work, mei_cl_bus_rx_work); - if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) { - mutex_lock(&bus->device_lock); - ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); - mutex_unlock(&bus->device_lock); - if (ret && ret != -EBUSY) - return ret; - } + mutex_lock(&bus->device_lock); + ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); + mutex_unlock(&bus->device_lock); + if (ret && ret != -EBUSY) + return ret; - if (cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)) { - mutex_lock(&bus->device_lock); - ret = mei_cl_notify_request(cldev->cl, NULL, event_cb ? 1 : 0); - mutex_unlock(&bus->device_lock); - if (ret) - return ret; - } + return 0; +} +EXPORT_SYMBOL_GPL(mei_cldev_register_rx_cb); + +/** + * mei_cldev_register_notif_cb - register FW notification event callback + * + * @cldev: me client devices + * @notif_cb: callback function + * + * Return: 0 on success + * -EALREADY if an callback is already registered + * <0 on other errors + */ +int mei_cldev_register_notif_cb(struct mei_cl_device *cldev, + mei_cldev_cb_t notif_cb) +{ + struct mei_device *bus = cldev->bus; + int ret; + + if (!notif_cb) + return -EINVAL; + + if (cldev->notif_cb) + return -EALREADY; + + cldev->notif_cb = notif_cb; + INIT_WORK(&cldev->notif_work, mei_cl_bus_notif_work); + + mutex_lock(&bus->device_lock); + ret = mei_cl_notify_request(cldev->cl, NULL, 1); + mutex_unlock(&bus->device_lock); + if (ret) + return ret; return 0; } -EXPORT_SYMBOL_GPL(mei_cldev_register_event_cb); +EXPORT_SYMBOL_GPL(mei_cldev_register_notif_cb); /** * mei_cldev_get_drvdata - driver data getter @@ -471,8 +492,6 @@ int mei_cldev_disable(struct mei_cl_device *cldev) bus = cldev->bus; - cldev->event_cb = NULL; - mutex_lock(&bus->device_lock); if (!mei_cl_is_connected(cl)) { @@ -619,9 +638,13 @@ static int mei_cl_device_remove(struct device *dev) if (!cldev || !dev->driver) return 0; - if (cldev->event_cb) { - cldev->event_cb = NULL; - cancel_work_sync(&cldev->event_work); + if (cldev->rx_cb) { + cancel_work_sync(&cldev->rx_work); + cldev->rx_cb = NULL; + } + if (cldev->notif_cb) { + cancel_work_sync(&cldev->notif_work); + cldev->notif_cb = NULL; } cldrv = to_mei_cl_driver(dev->driver); diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index 46ee9155ada6..9635b14b6011 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -673,6 +673,11 @@ int mei_cl_unlink(struct mei_cl *cl) list_del_init(&cl->link); cl->state = MEI_FILE_UNINITIALIZED; + cl->writing_state = MEI_IDLE; + + WARN_ON(!list_empty(&cl->rd_completed) || + !list_empty(&cl->rd_pending) || + !list_empty(&cl->link)); return 0; } diff --git a/drivers/nfc/mei_phy.c b/drivers/nfc/mei_phy.c index 03139c5a05e4..8a04c5e02999 100644 --- a/drivers/nfc/mei_phy.c +++ b/drivers/nfc/mei_phy.c @@ -297,9 +297,11 @@ static int mei_nfc_recv(struct nfc_mei_phy *phy, u8 *buf, size_t length) } -static void nfc_mei_event_cb(struct mei_cl_device *cldev, u32 events) +static void nfc_mei_rx_cb(struct mei_cl_device *cldev) { struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev); + struct sk_buff *skb; + int reply_size; if (!phy) return; @@ -307,27 +309,22 @@ static void nfc_mei_event_cb(struct mei_cl_device *cldev, u32 events) if (phy->hard_fault != 0) return; - if (events & BIT(MEI_CL_EVENT_RX)) { - struct sk_buff *skb; - int reply_size; - - skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL); - if (!skb) - return; + skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL); + if (!skb) + return; - reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ); - if (reply_size < MEI_NFC_HEADER_SIZE) { - kfree_skb(skb); - return; - } + reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ); + if (reply_size < MEI_NFC_HEADER_SIZE) { + kfree_skb(skb); + return; + } - skb_put(skb, reply_size); - skb_pull(skb, MEI_NFC_HEADER_SIZE); + skb_put(skb, reply_size); + skb_pull(skb, MEI_NFC_HEADER_SIZE); - MEI_DUMP_SKB_IN("mei frame read", skb); + MEI_DUMP_SKB_IN("mei frame read", skb); - nfc_hci_recv_frame(phy->hdev, skb); - } + nfc_hci_recv_frame(phy->hdev, skb); } static int nfc_mei_phy_enable(void *phy_id) @@ -358,8 +355,7 @@ static int nfc_mei_phy_enable(void *phy_id) goto err; } - r = mei_cldev_register_event_cb(phy->cldev, BIT(MEI_CL_EVENT_RX), - nfc_mei_event_cb); + r = mei_cldev_register_rx_cb(phy->cldev, nfc_mei_rx_cb); if (r) { pr_err("Event cb registration failed %d\n", r); goto err; diff --git a/drivers/watchdog/mei_wdt.c b/drivers/watchdog/mei_wdt.c index e0af52265511..79b35515904e 100644 --- a/drivers/watchdog/mei_wdt.c +++ b/drivers/watchdog/mei_wdt.c @@ -410,11 +410,11 @@ static void mei_wdt_unregister_work(struct work_struct *work) } /** - * mei_wdt_event_rx - callback for data receive + * mei_wdt_rx - callback for data receive * * @cldev: bus device */ -static void mei_wdt_event_rx(struct mei_cl_device *cldev) +static void mei_wdt_rx(struct mei_cl_device *cldev) { struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev); struct mei_wdt_start_response res; @@ -482,11 +482,11 @@ out: } /* - * mei_wdt_notify_event - callback for event notification + * mei_wdt_notif - callback for event notification * * @cldev: bus device */ -static void mei_wdt_notify_event(struct mei_cl_device *cldev) +static void mei_wdt_notif(struct mei_cl_device *cldev) { struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev); @@ -496,21 +496,6 @@ static void mei_wdt_notify_event(struct mei_cl_device *cldev) mei_wdt_register(wdt); } -/** - * mei_wdt_event - callback for event receive - * - * @cldev: bus device - * @events: event mask - */ -static void mei_wdt_event(struct mei_cl_device *cldev, u32 events) -{ - if (events & BIT(MEI_CL_EVENT_RX)) - mei_wdt_event_rx(cldev); - - if (events & BIT(MEI_CL_EVENT_NOTIF)) - mei_wdt_notify_event(cldev); -} - #if IS_ENABLED(CONFIG_DEBUG_FS) static ssize_t mei_dbgfs_read_activation(struct file *file, char __user *ubuf, @@ -621,16 +606,17 @@ static int mei_wdt_probe(struct mei_cl_device *cldev, goto err_out; } - ret = mei_cldev_register_event_cb(wdt->cldev, - BIT(MEI_CL_EVENT_RX) | - BIT(MEI_CL_EVENT_NOTIF), - mei_wdt_event); + ret = mei_cldev_register_rx_cb(wdt->cldev, mei_wdt_rx); + if (ret) { + dev_err(&cldev->dev, "Could not reg rx event ret=%d\n", ret); + goto err_disable; + } + ret = mei_cldev_register_notif_cb(wdt->cldev, mei_wdt_notif); /* on legacy devices notification is not supported - * this doesn't fail the registration for RX event */ if (ret && ret != -EOPNOTSUPP) { - dev_err(&cldev->dev, "Could not register event ret=%d\n", ret); + dev_err(&cldev->dev, "Could not reg notif event ret=%d\n", ret); goto err_disable; } diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h index 4adb2e7c9f84..017f5232b3de 100644 --- a/include/linux/mei_cl_bus.h +++ b/include/linux/mei_cl_bus.h @@ -8,8 +8,7 @@ struct mei_cl_device; struct mei_device; -typedef void (*mei_cldev_event_cb_t)(struct mei_cl_device *cldev, - u32 events); +typedef void (*mei_cldev_cb_t)(struct mei_cl_device *cldev); /** * struct mei_cl_device - MEI device handle @@ -24,11 +23,12 @@ typedef void (*mei_cldev_event_cb_t)(struct mei_cl_device *cldev, * @me_cl: me client * @cl: mei client * @name: device name - * @event_work: async work to execute event callback - * @event_cb: Drivers register this callback to get asynchronous ME - * events (e.g. Rx buffer pending) notifications. - * @events_mask: Events bit mask requested by driver. - * @events: Events bitmask sent to the driver. + * @rx_work: async work to execute Rx event callback + * @rx_cb: Drivers register this callback to get asynchronous ME + * Rx buffer pending notifications. + * @notif_work: async work to execute FW notif event callback + * @notif_cb: Drivers register this callback to get asynchronous ME + * FW notification pending notifications. * * @do_match: wheather device can be matched with a driver * @is_added: device is already scanned @@ -43,10 +43,10 @@ struct mei_cl_device { struct mei_cl *cl; char name[MEI_CL_NAME_SIZE]; - struct work_struct event_work; - mei_cldev_event_cb_t event_cb; - unsigned long events_mask; - unsigned long events; + struct work_struct rx_work; + mei_cldev_cb_t rx_cb; + struct work_struct notif_work; + mei_cldev_cb_t notif_cb; unsigned int do_match:1; unsigned int is_added:1; @@ -88,13 +88,9 @@ void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv); ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length); ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length); -int mei_cldev_register_event_cb(struct mei_cl_device *cldev, - unsigned long event_mask, - mei_cldev_event_cb_t read_cb); - -#define MEI_CL_EVENT_RX 0 -#define MEI_CL_EVENT_TX 1 -#define MEI_CL_EVENT_NOTIF 2 +int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb); +int mei_cldev_register_notif_cb(struct mei_cl_device *cldev, + mei_cldev_cb_t notif_cb); const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev); u8 mei_cldev_ver(const struct mei_cl_device *cldev); -- 2.20.1