diff options
Diffstat (limited to 'drivers/platform/chrome/cros_ec_debugfs.c')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_debugfs.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c index 21d973fc6be2..a98c529d8c69 100644 --- a/drivers/platform/chrome/cros_ec_debugfs.c +++ b/drivers/platform/chrome/cros_ec_debugfs.c @@ -38,6 +38,8 @@ static DECLARE_WAIT_QUEUE_HEAD(cros_ec_debugfs_log_wq); * @log_mutex: mutex to protect circular buffer * @log_poll_work: recurring task to poll EC for new console log data * @panicinfo_blob: panicinfo debugfs blob + * @notifier_panic: notifier_block to let kernel to flush buffered log + * when EC panic */ struct cros_ec_debugfs { struct cros_ec_dev *ec; @@ -49,6 +51,7 @@ struct cros_ec_debugfs { struct delayed_work log_poll_work; /* EC panicinfo */ struct debugfs_blob_wrapper panicinfo_blob; + struct notifier_block notifier_panic; }; /* @@ -437,6 +440,22 @@ free: return ret; } +static int cros_ec_debugfs_panic_event(struct notifier_block *nb, + unsigned long queued_during_suspend, void *_notify) +{ + struct cros_ec_debugfs *debug_info = + container_of(nb, struct cros_ec_debugfs, notifier_panic); + + if (debug_info->log_buffer.buf) { + /* Force log poll work to run immediately */ + mod_delayed_work(debug_info->log_poll_work.wq, &debug_info->log_poll_work, 0); + /* Block until log poll work finishes */ + flush_delayed_work(&debug_info->log_poll_work); + } + + return NOTIFY_DONE; +} + static int cros_ec_debugfs_probe(struct platform_device *pd) { struct cros_ec_dev *ec = dev_get_drvdata(pd->dev.parent); @@ -473,6 +492,12 @@ static int cros_ec_debugfs_probe(struct platform_device *pd) debugfs_create_u16("suspend_timeout_ms", 0664, debug_info->dir, &ec->ec_dev->suspend_timeout_ms); + debug_info->notifier_panic.notifier_call = cros_ec_debugfs_panic_event; + ret = blocking_notifier_chain_register(&ec->ec_dev->panic_notifier, + &debug_info->notifier_panic); + if (ret) + goto remove_debugfs; + ec->debug_info = debug_info; dev_set_drvdata(&pd->dev, ec); |