From: Randy Dunlap <randy_d_dunlap@xxxxxxxxxxxxxxx>
Add ability for SCSI drivers to invoke a shutdown method.
This allows drivers to make drives safe for shutdown/poweroff,
for example. Some drives need this to prevent possible problems.
Signed-off-by: Randy Dunlap <randy_d_dunlap@xxxxxxxxxxxxxxx>
---
drivers/scsi/ahci.c | 1 +
drivers/scsi/ata_piix.c | 1 +
drivers/scsi/libata-core.c | 23 +++++++++++++++++++++++
drivers/scsi/libata-scsi.c | 8 ++++++++
drivers/scsi/scsi_sysfs.c | 16 ++++++++++++++++
include/linux/libata.h | 2 ++
include/scsi/scsi_host.h | 1 +
7 files changed, 52 insertions(+)
--- linux-2616-rc3-standby.orig/drivers/scsi/libata-scsi.c
+++ linux-2616-rc3-standby/drivers/scsi/libata-scsi.c
@@ -412,6 +412,14 @@ int ata_scsi_device_suspend(struct scsi_
return ata_device_suspend(ap, dev);
}
+int ata_scsi_device_shutdown(struct scsi_device *sdev)
+{
+ struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
+ struct ata_device *dev = &ap->device[sdev->id];
+
+ return ata_device_shutdown(ap, dev);
+}
+
/**
* ata_to_sense_error - convert ATA error to SCSI error
* @id: ATA device number
--- linux-2616-rc3-standby.orig/drivers/scsi/libata-core.c
+++ linux-2616-rc3-standby/drivers/scsi/libata-core.c
@@ -4315,6 +4315,27 @@ int ata_device_suspend(struct ata_port *
return 0;
}
+/**
+ * ata_device_shutdown - send Standby Immediate command to drive
+ * @ap: target ata_port
+ * @dev: target device on the ata_port
+ *
+ * This command makes it safe to power-off a drive.
+ * Otherwise the heads may be flying at the wrong place
+ * when the power is removed.
+ */
+int ata_device_shutdown(struct ata_port *ap, struct ata_device *dev)
+{
+
+ if (!ata_dev_present(dev))
+ return 0;
+
+ ata_standby_drive(ap, dev);
+ ap->flags |= ATA_FLAG_SUSPENDED;
+
+ return 0;
+}
+
int ata_port_start (struct ata_port *ap)
{
struct device *dev = ap->host_set->dev;
@@ -5190,5 +5211,7 @@ EXPORT_SYMBOL_GPL(ata_pci_device_resume)
EXPORT_SYMBOL_GPL(ata_device_suspend);
EXPORT_SYMBOL_GPL(ata_device_resume);
+EXPORT_SYMBOL_GPL(ata_device_shutdown);
EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
+EXPORT_SYMBOL_GPL(ata_scsi_device_shutdown);
--- linux-2616-rc3-standby.orig/include/linux/libata.h
+++ linux-2616-rc3-standby/include/linux/libata.h
@@ -454,8 +454,10 @@ extern int ata_scsi_release(struct Scsi_
extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
extern int ata_scsi_device_resume(struct scsi_device *);
extern int ata_scsi_device_suspend(struct scsi_device *);
+extern int ata_scsi_device_shutdown(struct scsi_device *);
extern int ata_device_resume(struct ata_port *, struct ata_device *);
extern int ata_device_suspend(struct ata_port *, struct ata_device *);
+extern int ata_device_shutdown(struct ata_port *, struct ata_device *);
extern int ata_ratelimit(void);
/*
--- linux-2616-rc3-standby.orig/drivers/scsi/scsi_sysfs.c
+++ linux-2616-rc3-standby/drivers/scsi/scsi_sysfs.c
@@ -295,11 +295,27 @@ static int scsi_bus_resume(struct device
return err;
}
+static void scsi_bus_shutdown(struct device * dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct scsi_host_template *sht = sdev->host->hostt;
+ int err;
+
+ err = scsi_device_quiesce(sdev);
+ if (err)
+ printk(KERN_DEBUG "%s: error (0x%x) during shutdown\n",
+ __FUNCTION__, err);
+
+ if (sht->shutdown)
+ sht->shutdown(sdev);
+}
+
struct bus_type scsi_bus_type = {
.name = "scsi",
.match = scsi_bus_match,
.suspend = scsi_bus_suspend,
.resume = scsi_bus_resume,
+ .shutdown = scsi_bus_shutdown,
};
int scsi_sysfs_register(void)
--- linux-2616-rc3-standby.orig/include/scsi/scsi_host.h
+++ linux-2616-rc3-standby/include/scsi/scsi_host.h
@@ -301,6 +301,7 @@ struct scsi_host_template {
*/
int (*resume)(struct scsi_device *);
int (*suspend)(struct scsi_device *);
+ int (*shutdown)(struct scsi_device *);
/*
* Name of proc directory
--- linux-2616-rc3-standby.orig/drivers/scsi/ahci.c
+++ linux-2616-rc3-standby/drivers/scsi/ahci.c
@@ -214,6 +214,7 @@ static struct scsi_host_template ahci_sh
.dma_boundary = AHCI_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.bios_param = ata_std_bios_param,
+ .shutdown = ata_scsi_device_shutdown,
};
static const struct ata_port_operations ahci_ops = {
--- linux-2616-rc3-standby.orig/drivers/scsi/ata_piix.c
+++ linux-2616-rc3-standby/drivers/scsi/ata_piix.c
@@ -192,6 +192,7 @@ static struct scsi_host_template piix_sh
.bios_param = ata_std_bios_param,
.resume = ata_scsi_device_resume,
.suspend = ata_scsi_device_suspend,
+ .shutdown = ata_scsi_device_shutdown,
};
static const struct ata_port_operations piix_pata_ops = {
---
-
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