Commit 1f5000bd authored by Todd Poynor's avatar Todd Poynor Committed by Greg Kroah-Hartman
Browse files

initcall_debug: add deferred probe times 



initcall_debug attributes all deferred device probe retries for the
late_initcall level to function deferred_probe_initcall.  Add logs of
the individual device probe routines called, to identify which drivers
are executing for how long during the initcall path.  Deferred probes
that occur after initcall processing are not shown.

Example log messages added:

[    0.505119] deferred probe my-sound-device @ 6
[    0.517656] deferred probe my-sound-device returned after 1227 usecs

Signed-off-by: default avatarTodd Poynor <toddpoynor@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1af824f0

drivers/base/dd.c

+27 −1
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/device.h>

#include <linux/delay.h>

#include <linux/dma-mapping.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/kthread.h>

#include <linux/wait.h>
@@ -53,6 +54,7 @@ static DEFINE_MUTEX(deferred_probe_mutex); 
static LIST_HEAD(deferred_probe_pending_list);

static LIST_HEAD(deferred_probe_active_list);

static atomic_t deferred_trigger_count = ATOMIC_INIT(0);

static bool initcalls_done;



/*

 * In some cases, like suspend to RAM or hibernation, It might be reasonable
@@ -61,6 +63,26 @@ static atomic_t deferred_trigger_count = ATOMIC_INIT(0); 
 */

static bool defer_all_probes;



/*

 * For initcall_debug, show the deferred probes executed in late_initcall

 * processing.

 */

static void deferred_probe_debug(struct device *dev)

{

	ktime_t calltime, delta, rettime;

	unsigned long long duration;



	printk(KERN_DEBUG "deferred probe %s @ %i\n", dev_name(dev),

	       task_pid_nr(current));

	calltime = ktime_get();

	bus_probe_device(dev);

	rettime = ktime_get();

	delta = ktime_sub(rettime, calltime);

	duration = (unsigned long long) ktime_to_ns(delta) >> 10;

	printk(KERN_DEBUG "deferred probe %s returned after %lld usecs\n",

	       dev_name(dev), duration);

}



/*

 * deferred_probe_work_func() - Retry probing devices in the active list.

 */
@@ -106,6 +128,9 @@ static void deferred_probe_work_func(struct work_struct *work) 
		device_pm_unlock();



		dev_dbg(dev, "Retrying from deferred list\n");

		if (initcall_debug && !initcalls_done)

			deferred_probe_debug(dev);

		else

			bus_probe_device(dev);



		mutex_lock(&deferred_probe_mutex);
@@ -215,6 +240,7 @@ static int deferred_probe_initcall(void) 
	driver_deferred_probe_trigger();

	/* Sort as many dependencies as possible before exiting initcalls */

	flush_work(&deferred_probe_work);

	initcalls_done = true;

	return 0;

}

late_initcall(deferred_probe_initcall);

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