[PATCH 16/22] fjes: interrupt_watch_task

[Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>]

This patch adds interrupt_watch_task.
This task is used to prevent delay of interrupts.

Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
---
 drivers/platform/x86/fjes/fjes.h      |  5 +++++
 drivers/platform/x86/fjes/fjes_main.c | 40 ++++++++++++++++++++++++++++++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/fjes/fjes.h b/drivers/platform/x86/fjes/fjes.h
index 1ca282c..1a880a0 100644
--- a/drivers/platform/x86/fjes/fjes.h
+++ b/drivers/platform/x86/fjes/fjes.h
@@ -33,6 +33,7 @@
 #define FJES_TX_RETRY_TIMEOUT	(100)
 #define FJES_TX_TX_STALL_TIMEOUT	(FJES_TX_RETRY_INTERVAL/2)
 #define FJES_OPEN_ZONE_UPDATE_WAIT	(300) /* msec */
+#define FJES_IRQ_WATCH_DELAY	(HZ)
 
 /* board specific private data structure */
 struct fjes_adapter {
@@ -54,10 +55,14 @@ struct fjes_adapter {
 	bool irq_registered;
 
 	struct workqueue_struct *txrx_wq;
+	struct workqueue_struct *control_wq;
 
 	struct work_struct tx_stall_task;
 	struct work_struct raise_intr_rxdata_task;
 
+	struct delayed_work interrupt_watch_task;
+	bool interrupt_watch_enable;
+
 	struct fjes_hw hw;
 };
 
diff --git a/drivers/platform/x86/fjes/fjes_main.c b/drivers/platform/x86/fjes/fjes_main.c
index f5df457..8e78014 100644
--- a/drivers/platform/x86/fjes/fjes_main.c
+++ b/drivers/platform/x86/fjes/fjes_main.c
@@ -73,7 +73,7 @@ static int fjes_remove(struct platform_device *);
 
 static int fjes_sw_init(struct fjes_adapter *);
 static void fjes_netdev_setup(struct net_device *);
-
+static void fjes_irq_watch_task(struct work_struct *);
 static void fjes_rx_irq(struct fjes_adapter *, int);
 static int fjes_poll(struct napi_struct *, int);
 
@@ -200,6 +200,13 @@ static int fjes_request_irq(struct fjes_adapter *adapter)
 	struct net_device *netdev = adapter->netdev;
 	int result = -1;
 
+	adapter->interrupt_watch_enable = true;
+	if (!delayed_work_pending(&adapter->interrupt_watch_task)) {
+		queue_delayed_work(adapter->control_wq,
+				&adapter->interrupt_watch_task,
+				FJES_IRQ_WATCH_DELAY);
+	}
+
 	if (!adapter->irq_registered) {
 		result = request_irq(adapter->hw.hw_res.irq, fjes_intr,
 					IRQF_SHARED, netdev->name, adapter);
@@ -216,6 +223,8 @@ static void fjes_free_irq(struct fjes_adapter *adapter)
 {
 	struct fjes_hw *hw = &adapter->hw;
 
+	adapter->interrupt_watch_enable = false;
+	cancel_delayed_work_sync(&adapter->interrupt_watch_task);
 
 	fjes_hw_set_irqmask(hw, REG_ICTL_MASK_ALL, true);
 
@@ -306,6 +315,7 @@ static int fjes_close(struct net_device *netdev)
 
 	fjes_free_irq(adapter);
 
+	cancel_delayed_work_sync(&adapter->interrupt_watch_task);
 	cancel_work_sync(&adapter->raise_intr_rxdata_task);
 	cancel_work_sync(&adapter->tx_stall_task);
 
@@ -1047,11 +1057,15 @@ static int fjes_probe(struct platform_device *plat_dev)
 	adapter->open_guard = false;
 
 	adapter->txrx_wq = create_workqueue(DRV_NAME"/txrx");
+	adapter->control_wq = create_workqueue(DRV_NAME"/control");
 
 	INIT_WORK(&adapter->tx_stall_task, fjes_tx_stall_task);
 	INIT_WORK(&adapter->raise_intr_rxdata_task,
 			fjes_raise_intr_rxdata_task);
 
+	INIT_DELAYED_WORK(&adapter->interrupt_watch_task, fjes_irq_watch_task);
+	adapter->interrupt_watch_enable = false;
+
 	res = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
 	hw->hw_res.start = res->start;
 	hw->hw_res.size = res->end - res->start;
@@ -1094,8 +1108,11 @@ static int fjes_remove(struct platform_device *plat_dev)
 	struct fjes_adapter *adapter = netdev_priv(netdev);
 	struct fjes_hw *hw = &adapter->hw;
 
+	cancel_delayed_work_sync(&adapter->interrupt_watch_task);
 	cancel_work_sync(&adapter->raise_intr_rxdata_task);
 	cancel_work_sync(&adapter->tx_stall_task);
+	if (adapter->control_wq)
+		destroy_workqueue(adapter->control_wq);
 	if (adapter->txrx_wq)
 		destroy_workqueue(adapter->txrx_wq);
 
@@ -1133,6 +1150,27 @@ static void fjes_netdev_setup(struct net_device *netdev)
 	netdev->features |= NETIF_F_HW_CSUM | NETIF_F_HW_VLAN_CTAG_FILTER;
 }
 
+static void fjes_irq_watch_task(struct work_struct *work)
+{
+	struct fjes_adapter *adapter = container_of(to_delayed_work(work),
+			struct fjes_adapter, interrupt_watch_task);
+
+	local_irq_disable();
+	fjes_intr(adapter->hw.hw_res.irq, adapter);
+	local_irq_enable();
+
+	if (fjes_rxframe_search_exist(adapter, 0) >= 0)
+		napi_schedule(&adapter->napi);
+
+
+	if (adapter->interrupt_watch_enable) {
+		if (!delayed_work_pending(&adapter->interrupt_watch_task))
+			queue_delayed_work(adapter->control_wq,
+					&adapter->interrupt_watch_task,
+					FJES_IRQ_WATCH_DELAY);
+	}
+
+}
 
 /*
  *  fjes_init_module - Driver Registration Routine
-- 
1.8.3.1

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