On Sat, 2013-01-19 at 13:43 -0500, Douglas Gilbert wrote:
> On 13-01-18 11:27 AM, Ewan D. Milne wrote:
> > From: "Ewan D. Milne" <emi...@redhat.com>
> >
> > Added capability to scsi_debug to generate sense and Unit Attention
> > conditions to exercise the enhanced sense and Unit Attention handling.
> >
> > Signed-off-by: Ewan D. Milne <emi...@redhat.com>
> > ---
> > drivers/scsi/scsi_debug.c | 133
> > ++++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 133 insertions(+)
> >
> > diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
> > index 88f6d16..8fe9bcd 100644
> > --- a/drivers/scsi/scsi_debug.c
> > +++ b/drivers/scsi/scsi_debug.c
> > @@ -3051,10 +3051,27 @@ static ssize_t sdebug_max_luns_store(struct
> > device_driver * ddp,
> > const char * buf, size_t count)
> > {
> > int n;
> > +#ifdef CONFIG_SCSI_ENHANCED_UA
> > + struct sdebug_host_info *sdbg_host;
> > + struct sdebug_dev_info *devip;
> > +#endif
> >
> > if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
> > scsi_debug_max_luns = n;
> > sdebug_max_tgts_luns();
> > +
> > +#ifdef CONFIG_SCSI_ENHANCED_UA
> > + spin_lock(&sdebug_host_list_lock);
> > + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
> > + list_for_each_entry(devip, &sdbg_host->dev_info_list,
> > + dev_list) {
> > + mk_sense_buffer(devip, UNIT_ATTENTION,
> > + 0x3f, 0x0e);
> > + devip->sense_pending = 1;
> > + }
> > + }
> > + spin_unlock(&sdebug_host_list_lock);
> > +#endif
> > return count;
> > }
> > return -EINVAL;
> > @@ -3101,12 +3118,28 @@ static ssize_t sdebug_virtual_gb_store(struct
> > device_driver * ddp,
> > const char * buf, size_t count)
> > {
> > int n;
> > +#ifdef CONFIG_SCSI_ENHANCED_UA
> > + struct sdebug_host_info *sdbg_host;
> > + struct sdebug_dev_info *devip;
> > +#endif
> >
> > if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
> > scsi_debug_virtual_gb = n;
> >
> > sdebug_capacity = get_sdebug_capacity();
> >
> > +#ifdef CONFIG_SCSI_ENHANCED_UA
> > + spin_lock(&sdebug_host_list_lock);
> > + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
> > + list_for_each_entry(devip, &sdbg_host->dev_info_list,
> > + dev_list) {
> > + mk_sense_buffer(devip, UNIT_ATTENTION,
> > + 0x2a, 0x09);
> > + devip->sense_pending = 1;
> > + }
> > + }
> > + spin_unlock(&sdebug_host_list_lock);
> > +#endif
> > return count;
> > }
> > return -EINVAL;
> > @@ -3233,6 +3266,90 @@ static ssize_t sdebug_sense_overflow_store(struct
> > device_driver *ddp,
> > }
> > DRIVER_ATTR(sense_overflow, S_IWUSR, NULL, sdebug_sense_overflow_store);
> >
> > +#ifdef CONFIG_SCSI_ENHANCED_UA
> > +static ssize_t sdebug_ua_overflow_store(struct device_driver *ddp,
> > + const char *buf, size_t count)
> > +{
> > + int n;
> > + struct sdebug_host_info *sdbg_host;
> > + struct sdebug_dev_info *devip;
> > +
> > + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
> > + spin_lock(&sdebug_host_list_lock);
> > + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
> > + list_for_each_entry(devip, &sdbg_host->dev_info_list,
> > + dev_list) {
> > + if (scsi_debug_dsense) {
> > + mk_sense_buffer(devip, UNIT_ATTENTION,
> > + 0, 0);
> > + devip->sense_buff[7] = 8;
> > + devip->sense_buff[8] = 0x02;
> > + devip->sense_buff[9] = 0x06;
> > + devip->sense_buff[12] = 0x01;
> > + }
> > + devip->sense_pending = 1;
> > + }
> > + }
> > + spin_unlock(&sdebug_host_list_lock);
> > + return count;
> > + }
> > + return -EINVAL;
> > +}
> > +DRIVER_ATTR(ua_overflow, S_IWUSR, NULL, sdebug_ua_overflow_store);
> > +
> > +static ssize_t sdebug_soft_threshold_reached_store(struct device_driver
> > *ddp,
> > + const char *buf,
> > + size_t count)
> > +{
> > + int n;
> > + struct sdebug_host_info *sdbg_host;
> > + struct sdebug_dev_info *devip;
> > +
> > + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
> > + spin_lock(&sdebug_host_list_lock);
> > + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
> > + list_for_each_entry(devip, &sdbg_host->dev_info_list,
> > + dev_list) {
> > + mk_sense_buffer(devip, UNIT_ATTENTION,
> > + 0x38, 0x07);
> > + devip->sense_pending = 1;
> > + }
> > + }
> > + spin_unlock(&sdebug_host_list_lock);
> > + return count;
> > + }
> > + return -EINVAL;
> > +}
> > +DRIVER_ATTR(soft_threshold_reached, S_IWUSR, NULL,
> > + sdebug_soft_threshold_reached_store);
> > +
> > +static ssize_t sdebug_mode_parameters_changed_store(struct device_driver
> > *ddp,
> > + const char *buf,
> > + size_t count)
> > +{
> > + int n;
> > + struct sdebug_host_info *sdbg_host;
> > + struct sdebug_dev_info *devip;
> > +
> > + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
> > + spin_lock(&sdebug_host_list_lock);
> > + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
> > + list_for_each_entry(devip, &sdbg_host->dev_info_list,
> > + dev_list) {
> > + mk_sense_buffer(devip, UNIT_ATTENTION,
> > + 0x2a, 0x01);
> > + devip->sense_pending = 1;
> > + }
> > + }
> > + spin_unlock(&sdebug_host_list_lock);
> > + return count;
> > + }
> > + return -EINVAL;
> > +}
> > +DRIVER_ATTR(mode_parameters_changed, S_IWUSR, NULL,
> > + sdebug_mode_parameters_changed_store);
> > +#endif
> > +
> > /* Note: The following function creates attribute files in the
> > /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
> > files (over those found in the /sys/module/scsi_debug/parameters
> > @@ -3268,11 +3385,27 @@ static int do_create_driverfs_files(void)
> > ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
> > ret |= driver_create_file(&sdebug_driverfs_driver,
> > &driver_attr_sense_overflow);
> > +#ifdef CONFIG_SCSI_ENHANCED_UA
> > + ret |= driver_create_file(&sdebug_driverfs_driver,
> > + &driver_attr_ua_overflow);
> > + ret |= driver_create_file(&sdebug_driverfs_driver,
> > + &driver_attr_soft_threshold_reached);
> > + ret |= driver_create_file(&sdebug_driverfs_driver,
> > + &driver_attr_mode_parameters_changed);
> > +#endif
> > return ret;
> > }
> >
> > static void do_remove_driverfs_files(void)
> > {
> > +#ifdef CONFIG_SCSI_ENHANCED_UA
> > + driver_remove_file(&sdebug_driverfs_driver,
> > + &driver_attr_mode_parameters_changed);
> > + driver_remove_file(&sdebug_driverfs_driver,
> > + &driver_attr_soft_threshold_reached);
> > + driver_remove_file(&sdebug_driverfs_driver,
> > + &driver_attr_ua_overflow);
> > +#endif
> > driver_remove_file(&sdebug_driverfs_driver,
> > &driver_attr_sense_overflow);
> > driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
>
> Ewan,
> Looks good. Could you add MODULE_PARM_DESC macros (in
> alphabetical order) for mode_parameters_changed,
> soft_threshold_reached and ua_overflow?
It wasn't my intention to add these as module parameters, I only wanted
them to be writable via sysfs. This is because they are not attributes,
they are like the "rescan" sysfs mechanism in [scsi_sysfs.c] in that
writing to them causes an action to be performed.
>
> Doug Gilbert
>
Thanks for your comments.
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