*
* Registration and callback for the s390 common I/O layer.
*
- * Copyright IBM Corporation 2002, 2008
+ * Copyright IBM Corporation 2002, 2010
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include "zfcp_ext.h"
+#include "zfcp_reqlist.h"
+
+#define ZFCP_MODEL_PRIV 0x4
+
+static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
+
+struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
+{
+ struct zfcp_adapter *adapter;
+ unsigned long flags;
+
+ spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
+ adapter = dev_get_drvdata(&cdev->dev);
+ if (adapter)
+ kref_get(&adapter->ref);
+ spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
+ return adapter;
+}
+
+void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
+ kref_put(&adapter->ref, zfcp_adapter_release);
+ spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
+}
+
+static int zfcp_ccw_activate(struct ccw_device *cdev)
+
+{
+ struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+ if (!adapter)
+ return 0;
+
+ zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
+ ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
+ zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
+ "ccresu2", NULL);
+ zfcp_erp_wait(adapter);
+ flush_work(&adapter->scan_work);
+
+ zfcp_ccw_adapter_put(adapter);
+
+ return 0;
+}
+
+static struct ccw_device_id zfcp_ccw_device_id[] = {
+ { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
+ { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
+ {},
+};
+MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
+
+/**
+ * zfcp_ccw_priv_sch - check if subchannel is privileged
+ * @adapter: Adapter/Subchannel to check
+ */
+int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
+{
+ return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
+}
/**
* zfcp_ccw_probe - probe function of zfcp driver
- * @ccw_device: pointer to belonging ccw device
+ * @cdev: pointer to belonging ccw device
*
- * This function gets called by the common i/o layer and sets up the initial
- * data structures for each fcp adapter, which was detected by the system.
- * Also the sysfs files for this adapter will be created by this function.
- * In addition the nameserver port will be added to the ports of the adapter
- * and its sysfs representation will be created too.
+ * This function gets called by the common i/o layer for each FCP
+ * device found on the current system. This is only a stub to make cio
+ * work: To only allocate adapter resources for devices actually used,
+ * the allocation is deferred to the first call to ccw_set_online.
*/
-static int zfcp_ccw_probe(struct ccw_device *ccw_device)
+static int zfcp_ccw_probe(struct ccw_device *cdev)
{
- int retval = 0;
-
- down(&zfcp_data.config_sema);
- if (zfcp_adapter_enqueue(ccw_device)) {
- dev_err(&ccw_device->dev,
- "Setting up data structures for the "
- "FCP adapter failed\n");
- retval = -EINVAL;
- }
- up(&zfcp_data.config_sema);
- return retval;
+ return 0;
}
/**
* zfcp_ccw_remove - remove function of zfcp driver
- * @ccw_device: pointer to belonging ccw device
+ * @cdev: pointer to belonging ccw device
*
* This function gets called by the common i/o layer and removes an adapter
* from the system. Task of this function is to get rid of all units and
* ports that belong to this adapter. And in addition all resources of this
* adapter will be freed too.
*/
-static void zfcp_ccw_remove(struct ccw_device *ccw_device)
+static void zfcp_ccw_remove(struct ccw_device *cdev)
{
struct zfcp_adapter *adapter;
struct zfcp_port *port, *p;
LIST_HEAD(unit_remove_lh);
LIST_HEAD(port_remove_lh);
- ccw_device_set_offline(ccw_device);
- down(&zfcp_data.config_sema);
- adapter = dev_get_drvdata(&ccw_device->dev);
+ ccw_device_set_offline(cdev);
- write_lock_irq(&zfcp_data.config_lock);
- list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
- list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
+ adapter = zfcp_ccw_adapter_by_cdev(cdev);
+ if (!adapter)
+ return;
+
+ write_lock_irq(&adapter->port_list_lock);
+ list_for_each_entry_safe(port, p, &adapter->port_list, list) {
+ write_lock(&port->unit_list_lock);
+ list_for_each_entry_safe(unit, u, &port->unit_list, list)
list_move(&unit->list, &unit_remove_lh);
- atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
- &unit->status);
- }
+ write_unlock(&port->unit_list_lock);
list_move(&port->list, &port_remove_lh);
- atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
}
- atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
- write_unlock_irq(&zfcp_data.config_lock);
-
- list_for_each_entry_safe(port, p, &port_remove_lh, list) {
- list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
- if (unit->device)
- scsi_remove_device(unit->device);
- zfcp_unit_dequeue(unit);
- }
- zfcp_port_dequeue(port);
- }
- wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
- zfcp_adapter_dequeue(adapter);
+ write_unlock_irq(&adapter->port_list_lock);
+ zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
+
+ list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
+ zfcp_device_unregister(&unit->dev, &zfcp_sysfs_unit_attrs);
- up(&zfcp_data.config_sema);
+ list_for_each_entry_safe(port, p, &port_remove_lh, list)
+ zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
+
+ zfcp_adapter_unregister(adapter);
}
/**
* zfcp_ccw_set_online - set_online function of zfcp driver
- * @ccw_device: pointer to belonging ccw device
+ * @cdev: pointer to belonging ccw device
*
- * This function gets called by the common i/o layer and sets an adapter
- * into state online. Setting an fcp device online means that it will be
- * registered with the SCSI stack, that the QDIO queues will be set up
- * and that the adapter will be opened (asynchronously).
+ * This function gets called by the common i/o layer and sets an
+ * adapter into state online. The first call will allocate all
+ * adapter resources that will be retained until the device is removed
+ * via zfcp_ccw_remove.
+ *
+ * Setting an fcp device online means that it will be registered with
+ * the SCSI stack, that the QDIO queues will be set up and that the
+ * adapter will be opened.
*/
-static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
+static int zfcp_ccw_set_online(struct ccw_device *cdev)
{
- struct zfcp_adapter *adapter;
- int retval;
+ struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
- down(&zfcp_data.config_sema);
- adapter = dev_get_drvdata(&ccw_device->dev);
+ if (!adapter) {
+ adapter = zfcp_adapter_enqueue(cdev);
- retval = zfcp_erp_thread_setup(adapter);
- if (retval)
- goto out;
+ if (IS_ERR(adapter)) {
+ dev_err(&cdev->dev,
+ "Setting up data structures for the "
+ "FCP adapter failed\n");
+ return PTR_ERR(adapter);
+ }
+ kref_get(&adapter->ref);
+ }
/* initialize request counter */
- BUG_ON(!zfcp_reqlist_isempty(adapter));
+ BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
adapter->req_no = 0;
- zfcp_erp_modify_adapter_status(adapter, 10, NULL,
+ zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
- zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
- NULL);
+ zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
+ "ccsonl2", NULL);
zfcp_erp_wait(adapter);
- up(&zfcp_data.config_sema);
+
flush_work(&adapter->scan_work);
- return 0;
- out:
- up(&zfcp_data.config_sema);
- return retval;
+ zfcp_ccw_adapter_put(adapter);
+ return 0;
}
/**
* zfcp_ccw_set_offline - set_offline function of zfcp driver
- * @ccw_device: pointer to belonging ccw device
+ * @cdev: pointer to belonging ccw device
*
* This function gets called by the common i/o layer and sets an adapter
* into state offline.
*/
-static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
+static int zfcp_ccw_set_offline(struct ccw_device *cdev)
{
- struct zfcp_adapter *adapter;
+ struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+ if (!adapter)
+ return 0;
- down(&zfcp_data.config_sema);
- adapter = dev_get_drvdata(&ccw_device->dev);
- zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
+ zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
zfcp_erp_wait(adapter);
- zfcp_erp_thread_kill(adapter);
- up(&zfcp_data.config_sema);
+
+ zfcp_ccw_adapter_put(adapter);
return 0;
}
/**
* zfcp_ccw_notify - ccw notify function
- * @ccw_device: pointer to belonging ccw device
+ * @cdev: pointer to belonging ccw device
* @event: indicates if adapter was detached or attached
*
* This function gets called by the common i/o layer if an adapter has gone
* or reappeared.
*/
-static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
+static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
{
- struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
+ struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+ if (!adapter)
+ return 1;
switch (event) {
case CIO_GONE:
- dev_warn(&adapter->ccw_device->dev,
- "The FCP device has been detached\n");
- zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
+ dev_warn(&cdev->dev, "The FCP device has been detached\n");
+ zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
break;
case CIO_NO_PATH:
- dev_warn(&adapter->ccw_device->dev,
+ dev_warn(&cdev->dev,
"The CHPID for the FCP device is offline\n");
- zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
+ zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
break;
case CIO_OPER:
- dev_info(&adapter->ccw_device->dev,
- "The FCP device is operational again\n");
- zfcp_erp_modify_adapter_status(adapter, 11, NULL,
+ dev_info(&cdev->dev, "The FCP device is operational again\n");
+ zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
ZFCP_STATUS_COMMON_RUNNING,
ZFCP_SET);
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
- 89, NULL);
+ "ccnoti4", NULL);
+ break;
+ case CIO_BOXED:
+ dev_warn(&cdev->dev, "The FCP device did not respond within "
+ "the specified time\n");
+ zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
break;
}
+
+ zfcp_ccw_adapter_put(adapter);
return 1;
}
*/
static void zfcp_ccw_shutdown(struct ccw_device *cdev)
{
- struct zfcp_adapter *adapter;
+ struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
- down(&zfcp_data.config_sema);
- adapter = dev_get_drvdata(&cdev->dev);
- zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
- zfcp_erp_wait(adapter);
- up(&zfcp_data.config_sema);
-}
+ if (!adapter)
+ return;
-static struct ccw_device_id zfcp_ccw_device_id[] = {
- { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
- { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
- {},
-};
+ zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
+ zfcp_erp_wait(adapter);
+ zfcp_erp_thread_kill(adapter);
-MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
+ zfcp_ccw_adapter_put(adapter);
+}
-static struct ccw_driver zfcp_ccw_driver = {
+struct ccw_driver zfcp_ccw_driver = {
.owner = THIS_MODULE,
.name = "zfcp",
.ids = zfcp_ccw_device_id,
.set_offline = zfcp_ccw_set_offline,
.notify = zfcp_ccw_notify,
.shutdown = zfcp_ccw_shutdown,
+ .freeze = zfcp_ccw_set_offline,
+ .thaw = zfcp_ccw_activate,
+ .restore = zfcp_ccw_activate,
};
-
-/**
- * zfcp_ccw_register - ccw register function
- *
- * Registers the driver at the common i/o layer. This function will be called
- * at module load time/system start.
- */
-int __init zfcp_ccw_register(void)
-{
- return ccw_driver_register(&zfcp_ccw_driver);
-}
-
-/**
- * zfcp_get_adapter_by_busid - find zfcp_adapter struct
- * @busid: bus id string of zfcp adapter to find
- */
-struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
-{
- struct ccw_device *ccw_device;
- struct zfcp_adapter *adapter = NULL;
-
- ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
- if (ccw_device) {
- adapter = dev_get_drvdata(&ccw_device->dev);
- put_device(&ccw_device->dev);
- }
- return adapter;
-}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff