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[SCSI] sd: implement START/STOP management

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Implement SBC START/STOP management.  sdev->mange_start_stop is added.
When it's set to one, sd STOPs the device on suspend and shutdown and
STARTs it on resume.  sdev->manage_start_stop defaults is in sdev
instead of scsi_disk cdev to allow ->slave_config() override the
default configuration but is exported under scsi_disk sysfs node as
sdev->allow_restart is.

When manage_start_stop is zero (the default value), this patch doesn't
introduce any behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>

Rejections fixed and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Tejun Heo 2007-03-21 00:13:59 +09:00 • committed by James Bottomley
parent 3721050afc
commit c3c94c5a2f
4 changed files with 132 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

101
drivers/scsi/sd.c
View file

@ -147,6 +147,20 @@ static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
return count;
}
static ssize_t sd_store_manage_start_stop(struct class_device *cdev,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(cdev);
struct scsi_device *sdp = sdkp->device;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
return count;
}
static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf,
size_t count)
{
@ -179,6 +193,14 @@ static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
}
static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(cdev);
struct scsi_device *sdp = sdkp->device;
return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
}
static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(cdev);
@ -192,6 +214,8 @@ static struct class_device_attribute sd_disk_attrs[] = {
__ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
__ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
sd_store_allow_restart),
__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
sd_store_manage_start_stop),
__ATTR_NULL,
};
@ -208,6 +232,8 @@ static struct scsi_driver sd_template = {
.name = "sd",
.probe = sd_probe,
.remove = sd_remove,
.suspend = sd_suspend,
.resume = sd_resume,
.shutdown = sd_shutdown,
},
.rescan = sd_rescan,
@ -1707,6 +1733,32 @@ static void scsi_disk_release(struct class_device *cdev)
kfree(sdkp);
}
static int sd_start_stop_device(struct scsi_device *sdp, int start)
{
unsigned char cmd[6] = { START_STOP }; /* START_VALID */
struct scsi_sense_hdr sshdr;
int res;
if (start)
cmd[4] |= 1; /* START */
if (!scsi_device_online(sdp))
return -ENODEV;
res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
SD_TIMEOUT, SD_MAX_RETRIES);
if (res) {
printk(KERN_WARNING "FAILED\n status = %x, message = %02x, "
"host = %d, driver = %02x\n ",
status_byte(res), msg_byte(res),
host_byte(res), driver_byte(res));
if (driver_byte(res) & DRIVER_SENSE)
scsi_print_sense_hdr("sd", &sshdr);
}
return res;
}
/*
* Send a SYNCHRONIZE CACHE instruction down to the device through
* the normal SCSI command structure. Wait for the command to
@ -1714,6 +1766,7 @@ static void scsi_disk_release(struct class_device *cdev)
*/
static void sd_shutdown(struct device *dev)
{
struct scsi_device *sdp = to_scsi_device(dev);
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
if (!sdkp)
@ -1723,9 +1776,57 @@ static void sd_shutdown(struct device *dev)
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
sd_sync_cache(sdkp);
}
if (system_state != SYSTEM_RESTART && sdp->manage_start_stop) {
printk(KERN_NOTICE "Stopping disk %s: \n",
sdkp->disk->disk_name);
sd_start_stop_device(sdp, 0);
}
scsi_disk_put(sdkp);
}
static int sd_suspend(struct device *dev, pm_message_t mesg)
{
struct scsi_device *sdp = to_scsi_device(dev);
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
int ret;
if (!sdkp)
return 0; /* this can happen */
if (sdkp->WCE) {
printk(KERN_NOTICE "Synchronizing SCSI cache for disk %s: \n",
sdkp->disk->disk_name);
ret = sd_sync_cache(sdkp);
if (ret)
return ret;
}
if (mesg.event == PM_EVENT_SUSPEND && sdp->manage_start_stop) {
printk(KERN_NOTICE "Stopping disk %s: \n",
sdkp->disk->disk_name);
ret = sd_start_stop_device(sdp, 0);
if (ret)
return ret;
}
return 0;
}
static int sd_resume(struct device *dev)
{
struct scsi_device *sdp = to_scsi_device(dev);
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
if (!sdp->manage_start_stop)
return 0;
printk(KERN_NOTICE "Starting disk %s: \n", sdkp->disk->disk_name);
return sd_start_stop_device(sdp, 1);
}
/**
* init_sd - entry point for this driver (both when built in or when
* a module).