From 759c5b599cf4ddb3b56e66d459b1bf0fe2724fb8 Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Sat, 15 Jun 2019 12:00:56 +0200 Subject: rt2800: initial watchdog implementation Add watchdog for rt2800 devices. For now it only detect hung and print error. [Note: I verified that printing messages from process context is fine on MT7620 (WT3020) platform that have problem when printk is called from interrupt context]. Signed-off-by: Stanislaw Gruszka Signed-off-by: Kalle Valo --- drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 56 ++++++++++++++++++++++++ drivers/net/wireless/ralink/rt2x00/rt2800lib.h | 2 + drivers/net/wireless/ralink/rt2x00/rt2800pci.c | 1 + drivers/net/wireless/ralink/rt2x00/rt2800soc.c | 1 + drivers/net/wireless/ralink/rt2x00/rt2800usb.c | 1 + drivers/net/wireless/ralink/rt2x00/rt2x00queue.h | 6 +++ 6 files changed, 67 insertions(+) diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c index 621cd4ce69e2..d420d759a877 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c @@ -1212,6 +1212,60 @@ void rt2800_txdone_nostatus(struct rt2x00_dev *rt2x00dev) } EXPORT_SYMBOL_GPL(rt2800_txdone_nostatus); +static int rt2800_check_hung(struct data_queue *queue) +{ + unsigned int cur_idx = rt2800_drv_get_dma_done(queue); + + if (queue->wd_idx != cur_idx) + queue->wd_count = 0; + else + queue->wd_count++; + + return queue->wd_count > 16; +} + +void rt2800_watchdog(struct rt2x00_dev *rt2x00dev) +{ + struct data_queue *queue; + bool hung_tx = false; + bool hung_rx = false; + + if (test_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags)) + return; + + queue_for_each(rt2x00dev, queue) { + switch (queue->qid) { + case QID_AC_VO: + case QID_AC_VI: + case QID_AC_BE: + case QID_AC_BK: + case QID_MGMT: + if (rt2x00queue_empty(queue)) + continue; + hung_tx = rt2800_check_hung(queue); + break; + case QID_RX: + /* For station mode we should reactive at least + * beacons. TODO: need to find good way detect + * RX hung for AP mode. + */ + if (rt2x00dev->intf_sta_count == 0) + continue; + hung_rx = rt2800_check_hung(queue); + break; + default: + break; + } + } + + if (hung_tx) + rt2x00_warn(rt2x00dev, "Watchdog TX hung detected\n"); + + if (hung_rx) + rt2x00_warn(rt2x00dev, "Watchdog RX hung detected\n"); +} +EXPORT_SYMBOL_GPL(rt2800_watchdog); + static unsigned int rt2800_hw_beacon_base(struct rt2x00_dev *rt2x00dev, unsigned int index) { @@ -10211,6 +10265,8 @@ int rt2800_probe_hw(struct rt2x00_dev *rt2x00dev) __set_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags); } + rt2x00dev->link.watchdog_interval = msecs_to_jiffies(100); + /* * Set the rssi offset. */ diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.h b/drivers/net/wireless/ralink/rt2x00/rt2800lib.h index dbb413ec8b08..f35f4e20d5aa 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.h +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.h @@ -197,6 +197,8 @@ void rt2800_txdone_nostatus(struct rt2x00_dev *rt2x00dev); bool rt2800_txstatus_timeout(struct rt2x00_dev *rt2x00dev); bool rt2800_txstatus_pending(struct rt2x00_dev *rt2x00dev); +void rt2800_watchdog(struct rt2x00_dev *rt2x00dev); + void rt2800_write_beacon(struct queue_entry *entry, struct txentry_desc *txdesc); void rt2800_clear_beacon(struct queue_entry *entry); diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800pci.c b/drivers/net/wireless/ralink/rt2x00/rt2800pci.c index 71ef8f07b47b..df6345a92f72 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800pci.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800pci.c @@ -351,6 +351,7 @@ static const struct rt2x00lib_ops rt2800pci_rt2x00_ops = { .link_tuner = rt2800_link_tuner, .gain_calibration = rt2800_gain_calibration, .vco_calibration = rt2800_vco_calibration, + .watchdog = rt2800_watchdog, .start_queue = rt2800mmio_start_queue, .kick_queue = rt2800mmio_kick_queue, .stop_queue = rt2800mmio_stop_queue, diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800soc.c b/drivers/net/wireless/ralink/rt2x00/rt2800soc.c index 34e9291d949c..1054ade65af2 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800soc.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800soc.c @@ -196,6 +196,7 @@ static const struct rt2x00lib_ops rt2800soc_rt2x00_ops = { .link_tuner = rt2800_link_tuner, .gain_calibration = rt2800_gain_calibration, .vco_calibration = rt2800_vco_calibration, + .watchdog = rt2800_watchdog, .start_queue = rt2800mmio_start_queue, .kick_queue = rt2800mmio_kick_queue, .stop_queue = rt2800mmio_stop_queue, diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800usb.c b/drivers/net/wireless/ralink/rt2x00/rt2800usb.c index 9f23b18c50bb..da813dfa9a91 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800usb.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800usb.c @@ -687,6 +687,7 @@ static const struct rt2x00lib_ops rt2800usb_rt2x00_ops = { .link_tuner = rt2800_link_tuner, .gain_calibration = rt2800_gain_calibration, .vco_calibration = rt2800_vco_calibration, + .watchdog = rt2800_watchdog, .start_queue = rt2800usb_start_queue, .kick_queue = rt2x00usb_kick_queue, .stop_queue = rt2800usb_stop_queue, diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.h b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.h index 099e747f70e7..23739dd0bc9b 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00queue.h +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00queue.h @@ -435,6 +435,9 @@ enum data_queue_flags { * @length: Number of frames in queue. * @index: Index pointers to entry positions in the queue, * use &enum queue_index to get a specific index field. + * @wd_count: watchdog counter number of times entry does change + * in the queue + * @wd_idx: index of queue entry saved by watchdog * @txop: maximum burst time. * @aifs: The aifs value for outgoing frames (field ignored in RX queue). * @cw_min: The cw min value for outgoing frames (field ignored in RX queue). @@ -462,6 +465,9 @@ struct data_queue { unsigned short length; unsigned short index[Q_INDEX_MAX]; + unsigned short wd_count; + unsigned int wd_idx; + unsigned short txop; unsigned short aifs; unsigned short cw_min; -- cgit v1.2.3-55-g7522