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linux/drivers/s390/scsi/zfcp_sysfs.c
Swen Schillig 5ab944f97e [SCSI] zfcp: attach and release SAN nameserver port on demand 
Changing the zfcp behaviour from always having the nameserver port
open to an on-demand strategy.  This strategy reduces the use of
limited resources like port connections. The patch provides a common
infrastructure which could be used for all WKA ports in future.

Also reduce the number of nameserver lookups by changing the zfcp
behaviour of always querying the nameserver for the corresponding
destination ID of the remote port.  If the destination ID has changed
during the reopen process we will be informed and then trigger a
nameserver query on demand.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-10-03 12:11:53 -05:00

495 lines
15 KiB
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/*
* zfcp device driver
*
* sysfs attributes.
*
* Copyright IBM Corporation 2008
*/
#include "zfcp_ext.h"
#define ZFCP_DEV_ATTR(_feat, _name, _mode, _show, _store) \
struct device_attribute dev_attr_##_feat##_##_name = __ATTR(_name, _mode,\
_show, _store)
#define ZFCP_DEFINE_ATTR(_feat_def, _feat, _name, _format, _value) \
static ssize_t zfcp_sysfs_##_feat##_##_name##_show(struct device *dev, \
struct device_attribute *at,\
char *buf) \
{ \
struct _feat_def *_feat = dev_get_drvdata(dev); \
\
return sprintf(buf, _format, _value); \
} \
static ZFCP_DEV_ATTR(_feat, _name, S_IRUGO, \
zfcp_sysfs_##_feat##_##_name##_show, NULL);
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, status, "0x%08x\n",
atomic_read(&adapter->status));
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, peer_wwnn, "0x%016llx\n",
adapter->peer_wwnn);
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, peer_wwpn, "0x%016llx\n",
adapter->peer_wwpn);
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, peer_d_id, "0x%06x\n",
adapter->peer_d_id);
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, card_version, "0x%04x\n",
adapter->hydra_version);
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, lic_version, "0x%08x\n",
adapter->fsf_lic_version);
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, hardware_version, "0x%08x\n",
adapter->hardware_version);
ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, in_recovery, "%d\n",
(atomic_read(&adapter->status) &
ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
ZFCP_DEFINE_ATTR(zfcp_port, port, status, "0x%08x\n",
atomic_read(&port->status));
ZFCP_DEFINE_ATTR(zfcp_port, port, in_recovery, "%d\n",
(atomic_read(&port->status) &
ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
ZFCP_DEFINE_ATTR(zfcp_port, port, access_denied, "%d\n",
(atomic_read(&port->status) &
ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0);
ZFCP_DEFINE_ATTR(zfcp_unit, unit, status, "0x%08x\n",
atomic_read(&unit->status));
ZFCP_DEFINE_ATTR(zfcp_unit, unit, in_recovery, "%d\n",
(atomic_read(&unit->status) &
ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_denied, "%d\n",
(atomic_read(&unit->status) &
ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0);
ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_shared, "%d\n",
(atomic_read(&unit->status) &
ZFCP_STATUS_UNIT_SHARED) != 0);
ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_readonly, "%d\n",
(atomic_read(&unit->status) &
ZFCP_STATUS_UNIT_READONLY) != 0);
#define ZFCP_SYSFS_FAILED(_feat_def, _feat, _adapter, _mod_id, _reopen_id) \
static ssize_t zfcp_sysfs_##_feat##_failed_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct _feat_def *_feat = dev_get_drvdata(dev); \
\
if (atomic_read(&_feat->status) & ZFCP_STATUS_COMMON_ERP_FAILED) \
return sprintf(buf, "1\n"); \
else \
return sprintf(buf, "0\n"); \
} \
static ssize_t zfcp_sysfs_##_feat##_failed_store(struct device *dev, \
struct device_attribute *attr,\
const char *buf, size_t count)\
{ \
struct _feat_def *_feat = dev_get_drvdata(dev); \
unsigned long val; \
int retval = 0; \
\
down(&zfcp_data.config_sema); \
if (atomic_read(&_feat->status) & ZFCP_STATUS_COMMON_REMOVE) { \
retval = -EBUSY; \
goto out; \
} \
\
if (strict_strtoul(buf, 0, &val) || val != 0) { \
retval = -EINVAL; \
goto out; \
} \
\
zfcp_erp_modify_##_feat##_status(_feat, _mod_id, NULL, \
ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);\
zfcp_erp_##_feat##_reopen(_feat, ZFCP_STATUS_COMMON_ERP_FAILED, \
_reopen_id, NULL); \
zfcp_erp_wait(_adapter); \
out: \
up(&zfcp_data.config_sema); \
return retval ? retval : (ssize_t) count; \
} \
static ZFCP_DEV_ATTR(_feat, failed, S_IWUSR | S_IRUGO, \
zfcp_sysfs_##_feat##_failed_show, \
zfcp_sysfs_##_feat##_failed_store);
ZFCP_SYSFS_FAILED(zfcp_adapter, adapter, adapter, 44, 93);
ZFCP_SYSFS_FAILED(zfcp_port, port, port->adapter, 45, 96);
ZFCP_SYSFS_FAILED(zfcp_unit, unit, unit->port->adapter, 46, 97);
static ssize_t zfcp_sysfs_port_rescan_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zfcp_adapter *adapter = dev_get_drvdata(dev);
int ret;
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_REMOVE)
return -EBUSY;
ret = zfcp_scan_ports(adapter);
return ret ? ret : (ssize_t) count;
}
static ZFCP_DEV_ATTR(adapter, port_rescan, S_IWUSR, NULL,
zfcp_sysfs_port_rescan_store);
static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zfcp_adapter *adapter = dev_get_drvdata(dev);
struct zfcp_port *port;
wwn_t wwpn;
int retval = 0;
down(&zfcp_data.config_sema);
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_REMOVE) {
retval = -EBUSY;
goto out;
}
if (strict_strtoull(buf, 0, &wwpn)) {
retval = -EINVAL;
goto out;
}
write_lock_irq(&zfcp_data.config_lock);
port = zfcp_get_port_by_wwpn(adapter, wwpn);
if (port && (atomic_read(&port->refcount) == 0)) {
zfcp_port_get(port);
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
list_move(&port->list, &adapter->port_remove_lh);
} else
port = NULL;
write_unlock_irq(&zfcp_data.config_lock);
if (!port) {
retval = -ENXIO;
goto out;
}
zfcp_erp_port_shutdown(port, 0, 92, NULL);
zfcp_erp_wait(adapter);
zfcp_port_put(port);
zfcp_port_dequeue(port);
out:
up(&zfcp_data.config_sema);
return retval ? retval : (ssize_t) count;
}
static ZFCP_DEV_ATTR(adapter, port_remove, S_IWUSR, NULL,
zfcp_sysfs_port_remove_store);
static struct attribute *zfcp_adapter_attrs[] = {
&dev_attr_adapter_failed.attr,
&dev_attr_adapter_in_recovery.attr,
&dev_attr_adapter_port_remove.attr,
&dev_attr_adapter_port_rescan.attr,
&dev_attr_adapter_peer_wwnn.attr,
&dev_attr_adapter_peer_wwpn.attr,
&dev_attr_adapter_peer_d_id.attr,
&dev_attr_adapter_card_version.attr,
&dev_attr_adapter_lic_version.attr,
&dev_attr_adapter_status.attr,
&dev_attr_adapter_hardware_version.attr,
NULL
};
struct attribute_group zfcp_sysfs_adapter_attrs = {
.attrs = zfcp_adapter_attrs,
};
static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zfcp_port *port = dev_get_drvdata(dev);
struct zfcp_unit *unit;
fcp_lun_t fcp_lun;
int retval = -EINVAL;
down(&zfcp_data.config_sema);
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE) {
retval = -EBUSY;
goto out;
}
if (strict_strtoull(buf, 0, &fcp_lun))
goto out;
unit = zfcp_unit_enqueue(port, fcp_lun);
if (IS_ERR(unit))
goto out;
retval = 0;
zfcp_erp_unit_reopen(unit, 0, 94, NULL);
zfcp_erp_wait(unit->port->adapter);
zfcp_unit_put(unit);
out:
up(&zfcp_data.config_sema);
return retval ? retval : (ssize_t) count;
}
static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
static ssize_t zfcp_sysfs_unit_remove_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zfcp_port *port = dev_get_drvdata(dev);
struct zfcp_unit *unit;
fcp_lun_t fcp_lun;
int retval = 0;
down(&zfcp_data.config_sema);
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE) {
retval = -EBUSY;
goto out;
}
if (strict_strtoull(buf, 0, &fcp_lun)) {
retval = -EINVAL;
goto out;
}
write_lock_irq(&zfcp_data.config_lock);
unit = zfcp_get_unit_by_lun(port, fcp_lun);
if (unit && (atomic_read(&unit->refcount) == 0)) {
zfcp_unit_get(unit);
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
list_move(&unit->list, &port->unit_remove_lh);
} else
unit = NULL;
write_unlock_irq(&zfcp_data.config_lock);
if (!unit) {
retval = -ENXIO;
goto out;
}
zfcp_erp_unit_shutdown(unit, 0, 95, NULL);
zfcp_erp_wait(unit->port->adapter);
zfcp_unit_put(unit);
zfcp_unit_dequeue(unit);
out:
up(&zfcp_data.config_sema);
return retval ? retval : (ssize_t) count;
}
static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
static struct attribute *zfcp_port_attrs[] = {
&dev_attr_unit_add.attr,
&dev_attr_unit_remove.attr,
&dev_attr_port_failed.attr,
&dev_attr_port_in_recovery.attr,
&dev_attr_port_status.attr,
&dev_attr_port_access_denied.attr,
NULL
};
/**
* zfcp_sysfs_port_attrs - sysfs attributes for all other ports
*/
struct attribute_group zfcp_sysfs_port_attrs = {
.attrs = zfcp_port_attrs,
};
static struct attribute *zfcp_unit_attrs[] = {
&dev_attr_unit_failed.attr,
&dev_attr_unit_in_recovery.attr,
&dev_attr_unit_status.attr,
&dev_attr_unit_access_denied.attr,
&dev_attr_unit_access_shared.attr,
&dev_attr_unit_access_readonly.attr,
NULL
};
struct attribute_group zfcp_sysfs_unit_attrs = {
.attrs = zfcp_unit_attrs,
};
#define ZFCP_DEFINE_LATENCY_ATTR(_name) \
static ssize_t \
zfcp_sysfs_unit_##_name##_latency_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) { \
struct scsi_device *sdev = to_scsi_device(dev); \
struct zfcp_unit *unit = sdev->hostdata; \
struct zfcp_latencies *lat = &unit->latencies; \
struct zfcp_adapter *adapter = unit->port->adapter; \
unsigned long flags; \
unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc; \
\
spin_lock_irqsave(&lat->lock, flags); \
fsum = lat->_name.fabric.sum * adapter->timer_ticks; \
fmin = lat->_name.fabric.min * adapter->timer_ticks; \
fmax = lat->_name.fabric.max * adapter->timer_ticks; \
csum = lat->_name.channel.sum * adapter->timer_ticks; \
cmin = lat->_name.channel.min * adapter->timer_ticks; \
cmax = lat->_name.channel.max * adapter->timer_ticks; \
cc = lat->_name.counter; \
spin_unlock_irqrestore(&lat->lock, flags); \
\
do_div(fsum, 1000); \
do_div(fmin, 1000); \
do_div(fmax, 1000); \
do_div(csum, 1000); \
do_div(cmin, 1000); \
do_div(cmax, 1000); \
\
return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n", \
fmin, fmax, fsum, cmin, cmax, csum, cc); \
} \
static ssize_t \
zfcp_sysfs_unit_##_name##_latency_store(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct scsi_device *sdev = to_scsi_device(dev); \
struct zfcp_unit *unit = sdev->hostdata; \
struct zfcp_latencies *lat = &unit->latencies; \
unsigned long flags; \
\
spin_lock_irqsave(&lat->lock, flags); \
lat->_name.fabric.sum = 0; \
lat->_name.fabric.min = 0xFFFFFFFF; \
lat->_name.fabric.max = 0; \
lat->_name.channel.sum = 0; \
lat->_name.channel.min = 0xFFFFFFFF; \
lat->_name.channel.max = 0; \
lat->_name.counter = 0; \
spin_unlock_irqrestore(&lat->lock, flags); \
\
return (ssize_t) count; \
} \
static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO, \
zfcp_sysfs_unit_##_name##_latency_show, \
zfcp_sysfs_unit_##_name##_latency_store);
ZFCP_DEFINE_LATENCY_ATTR(read);
ZFCP_DEFINE_LATENCY_ATTR(write);
ZFCP_DEFINE_LATENCY_ATTR(cmd);
#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \
static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, \
struct device_attribute *attr,\
char *buf) \
{ \
struct scsi_device *sdev = to_scsi_device(dev); \
struct zfcp_unit *unit = sdev->hostdata; \
\
return sprintf(buf, _format, _value); \
} \
static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n",
unit->port->adapter->ccw_device->dev.bus_id);
ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
&dev_attr_fcp_lun,
&dev_attr_wwpn,
&dev_attr_hba_id,
&dev_attr_read_latency,
&dev_attr_write_latency,
&dev_attr_cmd_latency,
NULL
};
static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct Scsi_Host *scsi_host = dev_to_shost(dev);
struct fsf_qtcb_bottom_port *qtcb_port;
struct zfcp_adapter *adapter;
int retval;
adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
return -EOPNOTSUPP;
qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL);
if (!qtcb_port)
return -ENOMEM;
retval = zfcp_fsf_exchange_port_data_sync(adapter, qtcb_port);
if (!retval)
retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
qtcb_port->cb_util, qtcb_port->a_util);
kfree(qtcb_port);
return retval;
}
static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL);
static int zfcp_sysfs_adapter_ex_config(struct device *dev,
struct fsf_statistics_info *stat_inf)
{
struct Scsi_Host *scsi_host = dev_to_shost(dev);
struct fsf_qtcb_bottom_config *qtcb_config;
struct zfcp_adapter *adapter;
int retval;
adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
return -EOPNOTSUPP;
qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
GFP_KERNEL);
if (!qtcb_config)
return -ENOMEM;
retval = zfcp_fsf_exchange_config_data_sync(adapter, qtcb_config);
if (!retval)
*stat_inf = qtcb_config->stat_info;
kfree(qtcb_config);
return retval;
}
#define ZFCP_SHOST_ATTR(_name, _format, _arg...) \
static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev, \
struct device_attribute *attr,\
char *buf) \
{ \
struct fsf_statistics_info stat_info; \
int retval; \
\
retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info); \
if (retval) \
return retval; \
\
return sprintf(buf, _format, ## _arg); \
} \
static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_adapter_##_name##_show, NULL);
ZFCP_SHOST_ATTR(requests, "%llu %llu %llu\n",
(unsigned long long) stat_info.input_req,
(unsigned long long) stat_info.output_req,
(unsigned long long) stat_info.control_req);
ZFCP_SHOST_ATTR(megabytes, "%llu %llu\n",
(unsigned long long) stat_info.input_mb,
(unsigned long long) stat_info.output_mb);
ZFCP_SHOST_ATTR(seconds_active, "%llu\n",
(unsigned long long) stat_info.seconds_act);
static ssize_t zfcp_sysfs_adapter_q_full_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct Scsi_Host *scsi_host = class_to_shost(dev);
struct zfcp_adapter *adapter =
(struct zfcp_adapter *) scsi_host->hostdata[0];
return sprintf(buf, "%d\n", atomic_read(&adapter->qdio_outb_full));
}
static DEVICE_ATTR(queue_full, S_IRUGO, zfcp_sysfs_adapter_q_full_show, NULL);
struct device_attribute *zfcp_sysfs_shost_attrs[] = {
&dev_attr_utilization,
&dev_attr_requests,
&dev_attr_megabytes,
&dev_attr_seconds_active,
&dev_attr_queue_full,
NULL
};
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