firmware loader: cache devices firmware during suspend/resume cycle
This patch implements caching devices' firmware automatically during system syspend/resume cycle, so any device drivers can call request_firmware or request_firmware_nowait inside resume path to get the cached firmware if they have loaded firmwares successfully at least once before entering suspend. Signed-off-by: Ming Lei <ming.lei@canonical.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -24,6 +24,7 @@
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#include <linux/list.h>
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#include <linux/async.h>
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#include <linux/pm.h>
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#include <linux/suspend.h>
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#include "base.h"
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#include "power/power.h"
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@ -108,6 +109,8 @@ struct firmware_cache {
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wait_queue_head_t wait_queue;
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int cnt;
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struct delayed_work work;
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struct notifier_block pm_notify;
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};
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struct firmware_buf {
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@ -1217,6 +1220,31 @@ static void device_uncache_fw_images_delay(unsigned long delay)
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msecs_to_jiffies(delay));
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}
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#ifdef CONFIG_PM
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static int fw_pm_notify(struct notifier_block *notify_block,
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unsigned long mode, void *unused)
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{
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switch (mode) {
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case PM_HIBERNATION_PREPARE:
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case PM_SUSPEND_PREPARE:
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device_cache_fw_images();
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break;
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case PM_POST_SUSPEND:
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case PM_POST_HIBERNATION:
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case PM_POST_RESTORE:
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device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
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break;
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}
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return 0;
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}
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#else
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static int fw_pm_notify(struct notifier_block *notify_block,
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unsigned long mode, void *unused)
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{}
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#endif
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static void __init fw_cache_init(void)
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{
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spin_lock_init(&fw_cache.lock);
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@ -1229,6 +1257,9 @@ static void __init fw_cache_init(void)
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init_waitqueue_head(&fw_cache.wait_queue);
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INIT_DELAYED_WORK(&fw_cache.work,
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device_uncache_fw_images_work);
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fw_cache.pm_notify.notifier_call = fw_pm_notify;
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register_pm_notifier(&fw_cache.pm_notify);
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}
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static int __init firmware_class_init(void)
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@ -1239,6 +1270,7 @@ static int __init firmware_class_init(void)
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static void __exit firmware_class_exit(void)
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{
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unregister_pm_notifier(&fw_cache.pm_notify);
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class_unregister(&firmware_class);
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}
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