Commit aa3998dbeb3a ("ata: libata-scsi: Disable scsi device
manage_system_start_stop") change setting the manage_system_start_stop
flag to false for libata managed disks to enable libata internal
management of disk suspend/resume. However, a side effect of this change
is that on system shutdown, disks are no longer being stopped (set to
standby mode with the heads unloaded). While this is not a critical
issue, this unclean shutdown is not recommended and shows up with
increased smart counters (e.g. the unexpected power loss counter
"Unexpect_Power_Loss_Ct").
Instead of defining a shutdown driver method for all ATA adapter
drivers (not all of them define that operation), this patch resolves
this issue by further refining the sd driver start/stop control of disks
using the new flag manage_shutdown. If this new flag is set to true by
a low level driver, the function sd_shutdown() will issue a
START STOP UNIT command with the start argument set to 0 when a disk
needs to be powered off (suspended) on system power off, that is, when
system_state is equal to SYSTEM_POWER_OFF.
Similarly to the other manage_xxx flags, the new manage_shutdown flag is
exposed through sysfs as a read-write device attribute.
To avoid any confusion between manage_shutdown and
manage_system_start_stop, the comments describing these flags in
include/scsi/scsi.h are also improved.
Fixes: aa3998dbeb3a ("ata: libata-scsi: Disable scsi device manage_system_start_stop")
Cc: stable@xxxxxxxxxxxxxxx
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218038
Link: https://lore.kernel.org/all/cd397c88-bf53-4768-9ab8-9d107df9e613@xxxxxxxxx/
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Reviewed-by: Niklas Cassel <niklas.cassel@xxxxxxx>
---
Changes from v2:
* Fixed typo in the comments added to include/scsi/scsi_device.h
* Added Niklas's review tag
Changes from v1:
* Improved flags description in include/scsi/scsi_device.h
* Added missing sysfs export of manage_shutdown
drivers/ata/libata-scsi.c | 5 +++--
drivers/firewire/sbp2.c | 1 +
drivers/scsi/sd.c | 39 +++++++++++++++++++++++++++++++++++---
include/scsi/scsi_device.h | 20 +++++++++++++++++--
4 files changed, 58 insertions(+), 7 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a371b497035e..3a957c4da409 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1053,10 +1053,11 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
/*
* Ask the sd driver to issue START STOP UNIT on runtime suspend
- * and resume only. For system level suspend/resume, devices
- * power state is handled directly by libata EH.
+ * and resume and shutdown only. For system level suspend/resume,
+ * devices power state is handled directly by libata EH.
*/
sdev->manage_runtime_start_stop = true;
+ sdev->manage_shutdown = true;
}
/*
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 749868b9e80d..7edf2c95282f 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1521,6 +1521,7 @@ static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
if (sbp2_param_exclusive_login) {
sdev->manage_system_start_stop = true;
sdev->manage_runtime_start_stop = true;
+ sdev->manage_shutdown = true;
}
if (sdev->type == TYPE_ROM)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 83b6a3f3863b..6effa13039f3 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -209,7 +209,8 @@ manage_start_stop_show(struct device *dev,
return sysfs_emit(buf, "%u\n",
sdp->manage_system_start_stop &&
- sdp->manage_runtime_start_stop);
+ sdp->manage_runtime_start_stop &&
+ sdp->manage_shutdown);
}
static DEVICE_ATTR_RO(manage_start_stop);
@@ -275,6 +276,35 @@ manage_runtime_start_stop_store(struct device *dev,
}
static DEVICE_ATTR_RW(manage_runtime_start_stop);
+static ssize_t manage_shutdown_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_shutdown);
+}
+
+static ssize_t manage_shutdown_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_shutdown = v;
+
+ return count;
+}
+static DEVICE_ATTR_RW(manage_shutdown);
+
static ssize_t
allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
{
@@ -607,6 +637,7 @@ static struct attribute *sd_disk_attrs[] = {
&dev_attr_manage_start_stop.attr,
&dev_attr_manage_system_start_stop.attr,
&dev_attr_manage_runtime_start_stop.attr,
+ &dev_attr_manage_shutdown.attr,
&dev_attr_protection_type.attr,
&dev_attr_protection_mode.attr,
&dev_attr_app_tag_own.attr,
@@ -3819,8 +3850,10 @@ static void sd_shutdown(struct device *dev)
sd_sync_cache(sdkp, NULL);
}
- if (system_state != SYSTEM_RESTART &&
- sdkp->device->manage_system_start_stop) {
+ if ((system_state != SYSTEM_RESTART &&
+ sdkp->device->manage_system_start_stop) ||
+ (system_state == SYSTEM_POWER_OFF &&
+ sdkp->device->manage_shutdown)) {
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
sd_start_stop_device(sdkp, 0);
}
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index fd41fdac0a8e..65e49fae8da7 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -162,8 +162,24 @@ struct scsi_device {
* core. */
unsigned int eh_timeout; /* Error handling timeout */
- bool manage_system_start_stop; /* Let HLD (sd) manage system start/stop */
- bool manage_runtime_start_stop; /* Let HLD (sd) manage runtime start/stop */
+ /*
+ * If true, let the high-level device driver (sd) manage the device
+ * power state for system suspend/resume (suspend to RAM and
+ * hibernation) operations.
+ */
+ bool manage_system_start_stop;
+
+ /*
+ * If true, let the high-level device driver (sd) manage the device
+ * power state for runtime device suspand and resume operations.
+ */
+ bool manage_runtime_start_stop;
+
+ /*
+ * If true, let the high-level device driver (sd) manage the device
+ * power state for system shutdown (power off) operations.
+ */
+ bool manage_shutdown;
unsigned removable:1;
unsigned changed:1; /* Data invalid due to media change */
--
2.41.0
