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    Subject[PATCH 4/8] PM: suspend_block: Add debugfs file
    Date
    Report active and inactive suspend blockers in
    /sys/kernel/debug/suspend_blockers.

    Signed-off-by: Arve Hjønnevåg <arve@android.com>
    ---
    kernel/power/suspend_blocker.c | 43 ++++++++++++++++++++++++++++++++++++++-
    1 files changed, 41 insertions(+), 2 deletions(-)

    diff --git a/kernel/power/suspend_blocker.c b/kernel/power/suspend_blocker.c
    index 2c58b21..ced4993 100644
    --- a/kernel/power/suspend_blocker.c
    +++ b/kernel/power/suspend_blocker.c
    @@ -17,6 +17,7 @@
    #include <linux/rtc.h>
    #include <linux/suspend.h>
    #include <linux/suspend_blocker.h>
    +#include <linux/debugfs.h>
    #include "power.h"

    extern struct workqueue_struct *pm_wq;
    @@ -42,6 +43,7 @@ static int current_event_num;
    struct suspend_blocker main_suspend_blocker;
    static suspend_state_t requested_suspend_state = PM_SUSPEND_MEM;
    static bool enable_suspend_blockers;
    +static struct dentry *suspend_blocker_stats_dentry;

    #define pr_info_time(fmt, args...) \
    do { \
    @@ -55,6 +57,21 @@ static bool enable_suspend_blockers;
    tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec); \
    } while (0);

    +static int suspend_blocker_stats_show(struct seq_file *m, void *unused)
    +{
    + unsigned long irqflags;
    + struct suspend_blocker *blocker;
    +
    + seq_puts(m, "name\tactive\n");
    + spin_lock_irqsave(&list_lock, irqflags);
    + list_for_each_entry(blocker, &inactive_blockers, link)
    + seq_printf(m, "\"%s\"\t0\n", blocker->name);
    + list_for_each_entry(blocker, &active_blockers, link)
    + seq_printf(m, "\"%s\"\t1\n", blocker->name);
    + spin_unlock_irqrestore(&list_lock, irqflags);
    + return 0;
    +}
    +
    static void print_active_blockers_locked(void)
    {
    struct suspend_blocker *blocker;
    @@ -106,8 +123,8 @@ static DECLARE_WORK(suspend_work, suspend_worker);
    /**
    * suspend_blocker_init() - Initialize a suspend blocker
    * @blocker: The suspend blocker to initialize.
    - * @name: The name of the suspend blocker to show in debug messages.
    - *
    + * @name: The name of the suspend blocker to show in debug messages and
    + * /sys/kernel/debug/suspend_blockers.
    * The suspend blocker struct and name must not be freed before calling
    * suspend_blocker_destroy.
    */
    @@ -254,8 +271,30 @@ int request_suspend_state(suspend_state_t state)
    return 0;
    }

    +static int suspend_blocker_stats_open(struct inode *inode, struct file *file)
    +{
    + return single_open(file, suspend_blocker_stats_show, NULL);
    +}
    +
    +static const struct file_operations suspend_blocker_stats_fops = {
    + .owner = THIS_MODULE,
    + .open = suspend_blocker_stats_open,
    + .read = seq_read,
    + .llseek = seq_lseek,
    + .release = single_release,
    +};
    +
    void __init suspend_block_init(void)
    {
    suspend_blocker_init(&main_suspend_blocker, "main");
    suspend_block(&main_suspend_blocker);
    }
    +
    +static int __init suspend_block_postcore_init(void)
    +{
    + suspend_blocker_stats_dentry = debugfs_create_file("suspend_blockers",
    + S_IRUGO, NULL, NULL, &suspend_blocker_stats_fops);
    + return 0;
    +}
    +
    +postcore_initcall(suspend_block_postcore_init);
    --
    1.6.5.1
    --
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