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Commit 550b74d7 authored by Prateek Sood's avatar Prateek Sood Committed by Gerrit - the friendly Code Review server
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soc: watchdog: make irq tracker async 



Make irq tracker a work item to achieve async
tracking during watchdog pet.

Change-Id: I08f2c418608c06fe72166004c096e886328c1bb6
Signed-off-by: default avatarPrateek Sood <prsood@codeaurora.org>
parent bcc48a01

drivers/soc/qcom/watchdog_v2.c

+22 −3
Original line number Diff line number Diff line
@@ -105,9 +105,11 @@ struct msm_watchdog_data { 
	unsigned long long thread_start;

	unsigned long long ping_start[NR_CPUS];

	unsigned long long ping_end[NR_CPUS];

	struct work_struct irq_counts_work;

	struct irq_info irq_counts[NR_TOP_HITTERS];

	struct irq_info ipi_counts[NR_IPI];

	unsigned int tot_irq_count[NR_CPUS];

	atomic_t irq_counts_running;

};



/*
@@ -498,7 +500,7 @@ static void print_irq_stat(struct msm_watchdog_data *wdog_dd) 
	pr_cont("\n");

}



static void compute_irq_stat(struct msm_watchdog_data *wdog_dd)

static void compute_irq_stat(struct work_struct *work)

{

	unsigned int count;

	int index = 0, cpu, irq;
@@ -506,8 +508,20 @@ static void compute_irq_stat(struct msm_watchdog_data *wdog_dd) 
	struct irq_info *pos;

	struct irq_info *start;

	struct irq_info key = {0};

	unsigned int running;

	struct msm_watchdog_data *wdog_dd = container_of(work,

					    struct msm_watchdog_data,

					    irq_counts_work);



	size_t arr_size = ARRAY_SIZE(wdog_dd->irq_counts);



	/* avoid parallel execution from bark handler and queued

	 * irq_counts_work.

	 */

	running = atomic_xchg(&wdog_dd->irq_counts_running, 1);

	if (running)

		return;



	/* per irq counts */

	rcu_read_lock();

	for_each_irq_nr(irq) {
@@ -582,6 +596,7 @@ static void compute_irq_stat(struct msm_watchdog_data *wdog_dd) 
	}



	print_irq_stat(wdog_dd);

	atomic_xchg(&wdog_dd->irq_counts_running, 0);

}



static __ref int watchdog_kthread(void *arg)
@@ -622,7 +637,7 @@ static __ref int watchdog_kthread(void *arg) 
		 * Could have been changed on other cpu

		 */

		mod_timer(&wdog_dd->pet_timer, jiffies + delay_time);

		compute_irq_stat(wdog_dd);

		queue_work(system_unbound_wq, &wdog_dd->irq_counts_work);

	}

	return 0;

}
@@ -670,6 +685,7 @@ static int msm_watchdog_remove(struct platform_device *pdev) 
	dev_info(wdog_dd->dev, "MSM Watchdog Exit - Deactivated\n");

	del_timer_sync(&wdog_dd->pet_timer);

	kthread_stop(wdog_dd->watchdog_task);

	flush_work(&wdog_dd->irq_counts_work);

	kfree(wdog_dd);

	return 0;

}
@@ -679,7 +695,7 @@ void msm_trigger_wdog_bite(void) 
	if (!wdog_data)

		return;



	compute_irq_stat(wdog_data);

	compute_irq_stat(&wdog_data->irq_counts_work);

	pr_info("Causing a watchdog bite!");

	__raw_writel(1, wdog_data->base + WDT0_BITE_TIME);

	/* Mke sure bite time is written before we reset */
@@ -789,6 +805,9 @@ static void init_watchdog_data(struct msm_watchdog_data *wdog_dd) 
			return;

		}

	}



	INIT_WORK(&wdog_dd->irq_counts_work, compute_irq_stat);

	atomic_set(&wdog_dd->irq_counts_running, 0);

	delay_time = msecs_to_jiffies(wdog_dd->pet_time);

	wdog_dd->min_slack_ticks = UINT_MAX;

	wdog_dd->min_slack_ns = ULLONG_MAX;