Port mt76x02_check_tx_hang watchdog from vendor driver in order to
perform a device reset when tx mac/dma logic hangs. Tx mac/dma stuck
has been observed when the device is heavy loaded or in a noisy
environment. Moreover introduce wdt delayed work in order to run
tx_hang watchdog. For the moment run mt76x02_check_tx_hang watchdog
just on mt76x2 devices since the issue has not been observed on mt76x0
driver yet
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx>
---
Changes since v1:
- drop patch 1/2 and introduce wdt work
- move watchdog routines in mt76x02_mmio.c
---
drivers/net/wireless/mediatek/mt76/mt76.h | 1 +
drivers/net/wireless/mediatek/mt76/mt76x02.h | 8 ++
.../wireless/mediatek/mt76/mt76x02_debugfs.c | 2 +
.../net/wireless/mediatek/mt76/mt76x02_mac.c | 1 -
.../net/wireless/mediatek/mt76/mt76x02_mmio.c | 124 ++++++++++++++++++
.../net/wireless/mediatek/mt76/mt76x02_util.c | 2 +
.../wireless/mediatek/mt76/mt76x2/pci_init.c | 1 +
.../wireless/mediatek/mt76/mt76x2/pci_main.c | 2 +
8 files changed, 140 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 5cd508a68609..8ef430d8afc4 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -421,6 +421,7 @@ struct mt76_dev {
struct mt76_queue q_tx[__MT_TXQ_MAX];
struct mt76_queue q_rx[__MT_RXQ_MAX];
const struct mt76_queue_ops *queue_ops;
+ int tx_dma_idx[4];
wait_queue_head_t tx_wait;
struct sk_buff_head status_list;
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02.h b/drivers/net/wireless/mediatek/mt76/mt76x02.h
index f383fdd914c5..f594e8c82500 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02.h
@@ -28,6 +28,9 @@
#define MT_CALIBRATE_INTERVAL HZ
+#define MT_WATCHDOG_TIME (HZ / 10)
+#define MT_TX_HANG_TH 10
+
#define MT_MAX_CHAINS 2
struct mt76x02_rx_freq_cal {
s8 high_gain[MT_MAX_CHAINS];
@@ -79,6 +82,7 @@ struct mt76x02_dev {
struct tasklet_struct pre_tbtt_tasklet;
struct delayed_work cal_work;
struct delayed_work mac_work;
+ struct delayed_work wdt_work;
u32 aggr_stats[32];
@@ -89,6 +93,9 @@ struct mt76x02_dev {
u8 tbtt_count;
u16 beacon_int;
+ u32 tx_hang_reset;
+ u8 tx_hang_check;
+
struct mt76x02_calibration cal;
s8 target_power;
@@ -142,6 +149,7 @@ s8 mt76x02_tx_get_max_txpwr_adj(struct mt76x02_dev *dev,
const struct ieee80211_tx_rate *rate);
s8 mt76x02_tx_get_txpwr_adj(struct mt76x02_dev *dev, s8 txpwr,
s8 max_txpwr_adj);
+void mt76x02_wdt_work(struct work_struct *work);
void mt76x02_tx_set_txpwr_auto(struct mt76x02_dev *dev, s8 txpwr);
void mt76x02_set_tx_ackto(struct mt76x02_dev *dev);
void mt76x02_set_coverage_class(struct ieee80211_hw *hw,
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_debugfs.c b/drivers/net/wireless/mediatek/mt76/mt76x02_debugfs.c
index a9d52ba1e270..7580c5c986ff 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_debugfs.c
@@ -133,5 +133,7 @@ void mt76x02_init_debugfs(struct mt76x02_dev *dev)
read_txpower);
debugfs_create_devm_seqfile(dev->mt76.dev, "agc", dir, read_agc);
+
+ debugfs_create_u32("tx_hang_reset", 0400, dir, &dev->tx_hang_reset);
}
EXPORT_SYMBOL_GPL(mt76x02_init_debugfs);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
index cc584ea4a8d7..6adea0278284 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
@@ -943,7 +943,6 @@ void mt76x02_mac_work(struct work_struct *work)
dev->aggr_stats[idx++] += val >> 16;
}
- /* XXX: check beacon stuck for ap mode */
if (!dev->beacon_mask)
mt76x02_check_mac_err(dev);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
index 6974acc75e2b..6236c6121c01 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
@@ -385,3 +385,127 @@ void mt76x02_mac_start(struct mt76x02_dev *dev)
MT_INT_TX_STAT);
}
EXPORT_SYMBOL_GPL(mt76x02_mac_start);
+
+static bool mt76x02_tx_hang(struct mt76x02_dev *dev)
+{
+ u32 dma_idx, prev_dma_idx;
+ struct mt76_queue *q;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ q = &dev->mt76.q_tx[i];
+
+ if (!q->queued)
+ continue;
+
+ prev_dma_idx = dev->mt76.tx_dma_idx[i];
+ dma_idx = ioread32(&q->regs->dma_idx);
+ dev->mt76.tx_dma_idx[i] = dma_idx;
+
+ if (prev_dma_idx == dma_idx)
+ break;
+ }
+
+ return i < 4;
+}
+
+static void mt76x02_watchdog_reset(struct mt76x02_dev *dev)
+{
+ u32 mask = dev->mt76.mmio.irqmask;
+ int i;
+
+ ieee80211_stop_queues(dev->mt76.hw);
+ set_bit(MT76_RESET, &dev->mt76.state);
+
+ tasklet_disable(&dev->pre_tbtt_tasklet);
+ tasklet_disable(&dev->tx_tasklet);
+
+ for (i = 0; i < ARRAY_SIZE(dev->mt76.napi); i++)
+ napi_disable(&dev->mt76.napi[i]);
+
+ mutex_lock(&dev->mt76.mutex);
+
+ if (dev->beacon_mask)
+ mt76_clear(dev, MT_BEACON_TIME_CFG,
+ MT_BEACON_TIME_CFG_BEACON_TX |
+ MT_BEACON_TIME_CFG_TBTT_EN);
+
+ mt76x02_irq_disable(dev, mask);
+
+ /* perform device reset */
+ mt76_clear(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN);
+ mt76_wr(dev, MT_MAC_SYS_CTRL, 0);
+ mt76_clear(dev, MT_WPDMA_GLO_CFG,
+ MT_WPDMA_GLO_CFG_TX_DMA_EN | MT_WPDMA_GLO_CFG_RX_DMA_EN);
+ usleep_range(5000, 10000);
+ mt76_wr(dev, MT_INT_SOURCE_CSR, 0xffffffff);
+
+ /* let fw reset DMA */
+ mt76_set(dev, 0x734, 0x3);
+
+ for (i = 0; i < ARRAY_SIZE(dev->mt76.q_tx); i++)
+ mt76_queue_tx_cleanup(dev, i, true);
+
+ for (i = 0; i < ARRAY_SIZE(dev->mt76.q_rx); i++)
+ mt76_queue_rx_reset(dev, i);
+
+ mt76_wr(dev, MT_MAC_SYS_CTRL,
+ MT_MAC_SYS_CTRL_ENABLE_TX | MT_MAC_SYS_CTRL_ENABLE_RX);
+ mt76_set(dev, MT_WPDMA_GLO_CFG,
+ MT_WPDMA_GLO_CFG_TX_DMA_EN | MT_WPDMA_GLO_CFG_RX_DMA_EN);
+ if (dev->ed_monitor)
+ mt76_set(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN);
+
+ if (dev->beacon_mask)
+ mt76_set(dev, MT_BEACON_TIME_CFG,
+ MT_BEACON_TIME_CFG_BEACON_TX |
+ MT_BEACON_TIME_CFG_TBTT_EN);
+
+ mt76x02_irq_enable(dev, mask);
+
+ mutex_unlock(&dev->mt76.mutex);
+
+ clear_bit(MT76_RESET, &dev->mt76.state);
+
+ tasklet_enable(&dev->tx_tasklet);
+ tasklet_schedule(&dev->tx_tasklet);
+
+ tasklet_enable(&dev->pre_tbtt_tasklet);
+
+ for (i = 0; i < ARRAY_SIZE(dev->mt76.napi); i++) {
+ napi_enable(&dev->mt76.napi[i]);
+ napi_schedule(&dev->mt76.napi[i]);
+ }
+
+ ieee80211_wake_queues(dev->mt76.hw);
+
+ mt76_txq_schedule_all(&dev->mt76);
+}
+
+static void mt76x02_check_tx_hang(struct mt76x02_dev *dev)
+{
+ if (mt76x02_tx_hang(dev)) {
+ if (++dev->tx_hang_check < MT_TX_HANG_TH)
+ return;
+
+ mt76x02_watchdog_reset(dev);
+
+ dev->tx_hang_reset++;
+ dev->tx_hang_check = 0;
+ memset(dev->mt76.tx_dma_idx, 0xff,
+ sizeof(dev->mt76.tx_dma_idx));
+ } else {
+ dev->tx_hang_check = 0;
+ }
+}
+
+void mt76x02_wdt_work(struct work_struct *work)
+{
+ struct mt76x02_dev *dev = container_of(work, struct mt76x02_dev,
+ wdt_work.work);
+
+ mt76x02_check_tx_hang(dev);
+
+ ieee80211_queue_delayed_work(mt76_hw(dev), &dev->wdt_work,
+ MT_WATCHDOG_TIME);
+}
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
index aac64d0969b8..3c878f18e05d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
@@ -93,6 +93,8 @@ void mt76x02_init_device(struct mt76x02_dev *dev)
MT_DMA_HDR_LEN;
wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
} else {
+ INIT_DELAYED_WORK(&dev->wdt_work, mt76x02_wdt_work);
+
mt76x02_dfs_init_detector(dev);
wiphy->reg_notifier = mt76x02_regd_notifier;
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2/pci_init.c b/drivers/net/wireless/mediatek/mt76/mt76x2/pci_init.c
index 9f313824eead..34418e575542 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2/pci_init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2/pci_init.c
@@ -301,6 +301,7 @@ void mt76x2_stop_hardware(struct mt76x02_dev *dev)
{
cancel_delayed_work_sync(&dev->cal_work);
cancel_delayed_work_sync(&dev->mac_work);
+ cancel_delayed_work_sync(&dev->wdt_work);
mt76x02_mcu_set_radio_state(dev, false);
mt76x2_mac_stop(dev, false);
}
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2/pci_main.c b/drivers/net/wireless/mediatek/mt76/mt76x2/pci_main.c
index b54a32397486..6a87b88eb036 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2/pci_main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2/pci_main.c
@@ -34,6 +34,8 @@ mt76x2_start(struct ieee80211_hw *hw)
ieee80211_queue_delayed_work(mt76_hw(dev), &dev->mac_work,
MT_CALIBRATE_INTERVAL);
+ ieee80211_queue_delayed_work(mt76_hw(dev), &dev->wdt_work,
+ MT_WATCHDOG_TIME);
set_bit(MT76_STATE_RUNNING, &dev->mt76.state);
--
2.20.1
