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scsi: sd: Add manage_restart device attribute to scsi_disk

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In addition to the already existing manage_shutdown,
manage_system_start_stop and manage_runtime_start_stop device scsi_disk
attributes, add manage_restart, which allows the high-level device
driver (sd) to manage the device power state for SYSTEM_RESTART if set
to 1.

This attribute is necessary for the following commit "ata: stop disk on
restart if ACPI power resources are found" to avoid a potential disk
power failure in the case the SATA power connector does not retain the
power state after a restart.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Markus Probst <markus.probst@posteo.de>
Link: https://patch.msgid.link/20251104142413.322347-2-markus.probst@posteo.de
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Markus Probst
2025-11-04 14:24:32 +00:00
committed by Martin K. Petersen
parent 3a86608788
commit 8fdfdb1488
2 changed files with 39 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/scsi/sd.c
View File

@@ -318,6 +318,35 @@ static ssize_t manage_shutdown_store(struct device *dev,
}
static DEVICE_ATTR_RW(manage_shutdown);
static ssize_t manage_restart_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
return sysfs_emit(buf, "%u\n", sdp->manage_restart);
}
static ssize_t manage_restart_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
bool v;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (kstrtobool(buf, &v))
return -EINVAL;
sdp->manage_restart = v;
return count;
}
static DEVICE_ATTR_RW(manage_restart);
static ssize_t
allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
{
@@ -654,6 +683,7 @@ static struct attribute *sd_disk_attrs[] = {
&dev_attr_manage_system_start_stop.attr,
&dev_attr_manage_runtime_start_stop.attr,
&dev_attr_manage_shutdown.attr,
&dev_attr_manage_restart.attr,
&dev_attr_protection_type.attr,
&dev_attr_protection_mode.attr,
&dev_attr_app_tag_own.attr,
@@ -4177,7 +4207,9 @@ static void sd_shutdown(struct device *dev)
(system_state == SYSTEM_POWER_OFF &&
sdkp->device->manage_shutdown) ||
(system_state == SYSTEM_RUNNING &&
sdkp->device->manage_runtime_start_stop)) {
sdkp->device->manage_runtime_start_stop) ||
(system_state == SYSTEM_RESTART &&
sdkp->device->manage_restart)) {
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
sd_start_stop_device(sdkp, 0);
}

6
include/scsi/scsi_device.h
View File

@@ -178,6 +178,12 @@ struct scsi_device {
*/
unsigned manage_shutdown:1;
/*
* If true, let the high-level device driver (sd) manage the device
* power state for system restart (reboot) operations.
*/
unsigned manage_restart:1;
/*
* If set and if the device is runtime suspended, ask the high-level
* device driver (sd) to force a runtime resume of the device.