[PATCH v2 07/15] leds: trigger: blkdev: Add constants and types
From: Ian Pilcher <hidden>
Date: 2021-09-09 22:26:02
Also in:
linux-block, lkml
Subsystem:
led subsystem, the rest · Maintainers:
Lee Jones, Pavel Machek, Linus Torvalds
Avoid bloating gendisk structure by storing per-device trigger data in ledtrig_blkdev_disk Support many-to-many device/LED associations with ledtrig_blkdev_link struct. Per-device (ledtrig_blkdev_disk) and per-LED (ledtrig_blkdev_led) structures both include a list of links, so a device can be linked to multiple LEDs, and an LED can be linked to multiple devices. Signed-off-by: Ian Pilcher <redacted> --- drivers/leds/trigger/ledtrig-blkdev.c | 44 +++++++++++++++++++++++++++ 1 file changed, 44 insertions(+)
diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index 7f85e6080ea1..38a2cd2df85c 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c@@ -15,3 +15,47 @@ MODULE_DESCRIPTION("Block device LED trigger"); MODULE_AUTHOR("Ian Pilcher <arequipeno@gmail.com>"); MODULE_LICENSE("GPL v2"); MODULE_IMPORT_NS(LEDTRIG_BLKDEV); + +/* Default blink time & check interval (milliseconds) */ +#define LEDTRIG_BLKDEV_BLINK_MSEC 75 +#define LEDTRIG_BLKDEV_INTERVAL 100 + +/* Minimum blink time & check interval (milliseconds) */ +#define LEDTRIG_BLKDEV_MIN_BLINK 10 +#define LEDTRIG_BLKDEV_MIN_INT 25 + +enum ledtrig_blkdev_mode { + LEDTRIG_BLKDEV_MODE_RO = 0, /* blink for reads */ + LEDTRIG_BLKDEV_MODE_WO = 1, /* blink for writes */ + LEDTRIG_BLKDEV_MODE_RW = 2 /* blink for reads and writes */ +}; + +/* Per-block device information */ +struct ledtrig_blkdev_disk { + struct gendisk *gd; + struct kobject *dir; /* linked_leds dir */ + struct hlist_head leds; + unsigned long read_ios; + unsigned long write_ios; + unsigned int generation; + bool read_act; + bool write_act; +}; + +/* For many-to-many relationships between "disks" (block devices) and LEDs */ +struct ledtrig_blkdev_link { + struct hlist_node disk_leds_node; + struct hlist_node led_disks_node; + struct ledtrig_blkdev_disk *disk; + struct ledtrig_blkdev_led *led; +}; + +/* Every LED associated with the blkdev trigger gets one of these */ +struct ledtrig_blkdev_led { + struct kobject *dir; /* linked_devices dir */ + struct led_classdev *led_dev; + unsigned int blink_msec; + struct hlist_head disks; /* linked block devs */ + struct hlist_node leds_node; + enum ledtrig_blkdev_mode mode; +};
--
2.31.1