* drivers/s390/cio/device.c
* bus driver for ccw devices
*
- * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
+ * Copyright IBM Corp. 2002,2008
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*/
+
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/workqueue.h>
+#include <linux/timer.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include <asm/param.h> /* HZ */
+#include <asm/cmb.h>
+#include <asm/isc.h>
+#include "chp.h"
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "ioasm.h"
+#include "io_sch.h"
+#include "blacklist.h"
+
+static struct timer_list recovery_timer;
+static DEFINE_SPINLOCK(recovery_lock);
+static int recovery_phase;
+static const unsigned long recovery_delay[] = { 3, 30, 300 };
/******************* bus type handling ***********************/
/* Set up environment variables for ccw device uevent. Return 0 on success,
* non-zero otherwise. */
-static int ccw_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct ccw_device_id *id = &(cdev->id);
- int i = 0;
- int len = 0;
int ret;
char modalias_buf[30];
/* CU_TYPE= */
- ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
- "CU_TYPE=%04X", id->cu_type);
+ ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
if (ret)
return ret;
/* CU_MODEL= */
- ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
- "CU_MODEL=%02X", id->cu_model);
+ ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
if (ret)
return ret;
/* The next two can be zero, that's ok for us */
/* DEV_TYPE= */
- ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
- "DEV_TYPE=%04X", id->dev_type);
+ ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
if (ret)
return ret;
/* DEV_MODEL= */
- ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
- "DEV_MODEL=%02X", id->dev_model);
+ ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
if (ret)
return ret;
/* MODALIAS= */
snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
- ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
- "MODALIAS=%s", modalias_buf);
+ ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
return ret;
}
struct bus_type ccw_bus_type;
-static int io_subchannel_probe (struct subchannel *);
-static int io_subchannel_remove (struct subchannel *);
-static int io_subchannel_notify(struct device *, int);
-static void io_subchannel_verify(struct device *);
-static void io_subchannel_ioterm(struct device *);
+static void io_subchannel_irq(struct subchannel *);
+static int io_subchannel_probe(struct subchannel *);
+static int io_subchannel_remove(struct subchannel *);
static void io_subchannel_shutdown(struct subchannel *);
+static int io_subchannel_sch_event(struct subchannel *, int);
+static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
+ int);
+static void recovery_func(unsigned long data);
+struct workqueue_struct *ccw_device_work;
+wait_queue_head_t ccw_device_init_wq;
+atomic_t ccw_device_init_count;
+
+static struct css_device_id io_subchannel_ids[] = {
+ { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
+ { /* end of list */ },
+};
+MODULE_DEVICE_TABLE(css, io_subchannel_ids);
+
+static int io_subchannel_prepare(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+ /*
+ * Don't allow suspend while a ccw device registration
+ * is still outstanding.
+ */
+ cdev = sch_get_cdev(sch);
+ if (cdev && !device_is_registered(&cdev->dev))
+ return -EAGAIN;
+ return 0;
+}
-struct css_driver io_subchannel_driver = {
- .subchannel_type = SUBCHANNEL_TYPE_IO,
- .drv = {
- .name = "io_subchannel",
- .bus = &css_bus_type,
- },
+static void io_subchannel_settle(void)
+{
+ wait_event(ccw_device_init_wq,
+ atomic_read(&ccw_device_init_count) == 0);
+ flush_workqueue(ccw_device_work);
+}
+
+static struct css_driver io_subchannel_driver = {
+ .owner = THIS_MODULE,
+ .subchannel_type = io_subchannel_ids,
+ .name = "io_subchannel",
.irq = io_subchannel_irq,
- .notify = io_subchannel_notify,
- .verify = io_subchannel_verify,
- .termination = io_subchannel_ioterm,
+ .sch_event = io_subchannel_sch_event,
+ .chp_event = io_subchannel_chp_event,
.probe = io_subchannel_probe,
.remove = io_subchannel_remove,
.shutdown = io_subchannel_shutdown,
+ .prepare = io_subchannel_prepare,
+ .settle = io_subchannel_settle,
};
-struct workqueue_struct *ccw_device_work;
-struct workqueue_struct *ccw_device_notify_work;
-wait_queue_head_t ccw_device_init_wq;
-atomic_t ccw_device_init_count;
-
-static int __init
-init_ccw_bus_type (void)
+int __init io_subchannel_init(void)
{
int ret;
init_waitqueue_head(&ccw_device_init_wq);
atomic_set(&ccw_device_init_count, 0);
+ setup_timer(&recovery_timer, recovery_func, 0);
ccw_device_work = create_singlethread_workqueue("cio");
if (!ccw_device_work)
- return -ENOMEM; /* FIXME: better errno ? */
- ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
- if (!ccw_device_notify_work) {
- ret = -ENOMEM; /* FIXME: better errno ? */
- goto out_err;
- }
+ return -ENOMEM;
slow_path_wq = create_singlethread_workqueue("kslowcrw");
if (!slow_path_wq) {
- ret = -ENOMEM; /* FIXME: better errno ? */
+ ret = -ENOMEM;
goto out_err;
}
if ((ret = bus_register (&ccw_bus_type)))
goto out_err;
- if ((ret = driver_register(&io_subchannel_driver.drv)))
+ ret = css_driver_register(&io_subchannel_driver);
+ if (ret)
goto out_err;
- wait_event(ccw_device_init_wq,
- atomic_read(&ccw_device_init_count) == 0);
- flush_workqueue(ccw_device_work);
return 0;
out_err:
if (ccw_device_work)
destroy_workqueue(ccw_device_work);
- if (ccw_device_notify_work)
- destroy_workqueue(ccw_device_notify_work);
if (slow_path_wq)
destroy_workqueue(slow_path_wq);
return ret;
}
-static void __exit
-cleanup_ccw_bus_type (void)
-{
- driver_unregister(&io_subchannel_driver.drv);
- bus_unregister(&ccw_bus_type);
- destroy_workqueue(ccw_device_notify_work);
- destroy_workqueue(ccw_device_work);
-}
-
-subsys_initcall(init_ccw_bus_type);
-module_exit(cleanup_ccw_bus_type);
/************************ device handling **************************/
struct ccw_device_id *id = &(cdev->id);
int len;
- len = snprint_alias(buf, PAGE_SIZE, id, "\n") + 1;
+ len = snprint_alias(buf, PAGE_SIZE, id, "\n");
return len > PAGE_SIZE ? PAGE_SIZE : len;
}
static void ccw_device_unregister(struct ccw_device *cdev)
{
- if (test_and_clear_bit(1, &cdev->private->registered))
+ if (device_is_registered(&cdev->dev)) {
+ /* Undo device_add(). */
device_del(&cdev->dev);
-}
-
-static void
-ccw_device_remove_disconnected(struct ccw_device *cdev)
-{
- struct subchannel *sch;
- unsigned long flags;
- /*
- * Forced offline in disconnected state means
- * 'throw away device'.
- */
- if (ccw_device_is_orphan(cdev)) {
- /* Deregister ccw device. */
- spin_lock_irqsave(cdev->ccwlock, flags);
- cdev->private->state = DEV_STATE_NOT_OPER;
- spin_unlock_irqrestore(cdev->ccwlock, flags);
- ccw_device_unregister(cdev);
+ }
+ if (cdev->private->flags.initialized) {
+ cdev->private->flags.initialized = 0;
+ /* Release reference from device_initialize(). */
put_device(&cdev->dev);
- return ;
}
- sch = to_subchannel(cdev->dev.parent);
- css_sch_device_unregister(sch);
- /* Reset intparm to zeroes. */
- sch->schib.pmcw.intparm = 0;
- cio_modify(sch);
- put_device(&sch->dev);
}
-int
-ccw_device_set_offline(struct ccw_device *cdev)
+static void io_subchannel_quiesce(struct subchannel *);
+
+/**
+ * ccw_device_set_offline() - disable a ccw device for I/O
+ * @cdev: target ccw device
+ *
+ * This function calls the driver's set_offline() function for @cdev, if
+ * given, and then disables @cdev.
+ * Returns:
+ * %0 on success and a negative error value on failure.
+ * Context:
+ * enabled, ccw device lock not held
+ */
+int ccw_device_set_offline(struct ccw_device *cdev)
{
- int ret;
+ struct subchannel *sch;
+ int ret, state;
if (!cdev)
return -ENODEV;
}
cdev->online = 0;
spin_lock_irq(cdev->ccwlock);
- ret = ccw_device_offline(cdev);
- if (ret == -ENODEV) {
- if (cdev->private->state != DEV_STATE_NOT_OPER) {
- cdev->private->state = DEV_STATE_OFFLINE;
- dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
- }
+ sch = to_subchannel(cdev->dev.parent);
+ /* Wait until a final state or DISCONNECTED is reached */
+ while (!dev_fsm_final_state(cdev) &&
+ cdev->private->state != DEV_STATE_DISCONNECTED) {
spin_unlock_irq(cdev->ccwlock);
- return ret;
+ wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
+ cdev->private->state == DEV_STATE_DISCONNECTED));
+ spin_lock_irq(cdev->ccwlock);
}
+ do {
+ ret = ccw_device_offline(cdev);
+ if (!ret)
+ break;
+ CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
+ "0.%x.%04x\n", ret, cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ if (ret != -EBUSY)
+ goto error;
+ state = cdev->private->state;
+ spin_unlock_irq(cdev->ccwlock);
+ io_subchannel_quiesce(sch);
+ spin_lock_irq(cdev->ccwlock);
+ cdev->private->state = state;
+ } while (ret == -EBUSY);
spin_unlock_irq(cdev->ccwlock);
- if (ret == 0)
- wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
- else {
- pr_debug("ccw_device_offline returned %d, device %s\n",
- ret, cdev->dev.bus_id);
- cdev->online = 1;
+ wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
+ cdev->private->state == DEV_STATE_DISCONNECTED));
+ /* Inform the user if set offline failed. */
+ if (cdev->private->state == DEV_STATE_BOXED) {
+ pr_warning("%s: The device entered boxed state while "
+ "being set offline\n", dev_name(&cdev->dev));
+ } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
+ pr_warning("%s: The device stopped operating while "
+ "being set offline\n", dev_name(&cdev->dev));
}
- return ret;
+ /* Give up reference from ccw_device_set_online(). */
+ put_device(&cdev->dev);
+ return 0;
+
+error:
+ cdev->private->state = DEV_STATE_OFFLINE;
+ dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
+ spin_unlock_irq(cdev->ccwlock);
+ /* Give up reference from ccw_device_set_online(). */
+ put_device(&cdev->dev);
+ return -ENODEV;
}
-int
-ccw_device_set_online(struct ccw_device *cdev)
+/**
+ * ccw_device_set_online() - enable a ccw device for I/O
+ * @cdev: target ccw device
+ *
+ * This function first enables @cdev and then calls the driver's set_online()
+ * function for @cdev, if given. If set_online() returns an error, @cdev is
+ * disabled again.
+ * Returns:
+ * %0 on success and a negative error value on failure.
+ * Context:
+ * enabled, ccw device lock not held
+ */
+int ccw_device_set_online(struct ccw_device *cdev)
{
int ret;
+ int ret2;
if (!cdev)
return -ENODEV;
if (cdev->online || !cdev->drv)
return -EINVAL;
+ /* Hold on to an extra reference while device is online. */
+ if (!get_device(&cdev->dev))
+ return -ENODEV;
spin_lock_irq(cdev->ccwlock);
ret = ccw_device_online(cdev);
if (ret == 0)
wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
else {
- pr_debug("ccw_device_online returned %d, device %s\n",
- ret, cdev->dev.bus_id);
+ CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
+ "device 0.%x.%04x\n",
+ ret, cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ /* Give up online reference since onlining failed. */
+ put_device(&cdev->dev);
return ret;
}
- if (cdev->private->state != DEV_STATE_ONLINE)
+ spin_lock_irq(cdev->ccwlock);
+ /* Check if online processing was successful */
+ if ((cdev->private->state != DEV_STATE_ONLINE) &&
+ (cdev->private->state != DEV_STATE_W4SENSE)) {
+ spin_unlock_irq(cdev->ccwlock);
+ /* Inform the user that set online failed. */
+ if (cdev->private->state == DEV_STATE_BOXED) {
+ pr_warning("%s: Setting the device online failed "
+ "because it is boxed\n",
+ dev_name(&cdev->dev));
+ } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
+ pr_warning("%s: Setting the device online failed "
+ "because it is not operational\n",
+ dev_name(&cdev->dev));
+ }
+ /* Give up online reference since onlining failed. */
+ put_device(&cdev->dev);
return -ENODEV;
- if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
- cdev->online = 1;
- return 0;
}
+ spin_unlock_irq(cdev->ccwlock);
+ if (cdev->drv->set_online)
+ ret = cdev->drv->set_online(cdev);
+ if (ret)
+ goto rollback;
+ cdev->online = 1;
+ return 0;
+
+rollback:
spin_lock_irq(cdev->ccwlock);
- ret = ccw_device_offline(cdev);
+ /* Wait until a final state or DISCONNECTED is reached */
+ while (!dev_fsm_final_state(cdev) &&
+ cdev->private->state != DEV_STATE_DISCONNECTED) {
+ spin_unlock_irq(cdev->ccwlock);
+ wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
+ cdev->private->state == DEV_STATE_DISCONNECTED));
+ spin_lock_irq(cdev->ccwlock);
+ }
+ ret2 = ccw_device_offline(cdev);
+ if (ret2)
+ goto error;
spin_unlock_irq(cdev->ccwlock);
- if (ret == 0)
- wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
- else
- pr_debug("ccw_device_offline returned %d, device %s\n",
- ret, cdev->dev.bus_id);
- return (ret == 0) ? -ENODEV : ret;
+ wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
+ cdev->private->state == DEV_STATE_DISCONNECTED));
+ /* Give up online reference since onlining failed. */
+ put_device(&cdev->dev);
+ return ret;
+
+error:
+ CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
+ "device 0.%x.%04x\n",
+ ret2, cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ cdev->private->state = DEV_STATE_OFFLINE;
+ spin_unlock_irq(cdev->ccwlock);
+ /* Give up online reference since onlining failed. */
+ put_device(&cdev->dev);
+ return ret;
}
-static void online_store_handle_offline(struct ccw_device *cdev)
+static int online_store_handle_offline(struct ccw_device *cdev)
{
- if (cdev->private->state == DEV_STATE_DISCONNECTED)
- ccw_device_remove_disconnected(cdev);
- else if (cdev->drv && cdev->drv->set_offline)
- ccw_device_set_offline(cdev);
+ if (cdev->private->state == DEV_STATE_DISCONNECTED) {
+ spin_lock_irq(cdev->ccwlock);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
+ spin_unlock_irq(cdev->ccwlock);
+ } else if (cdev->online && cdev->drv && cdev->drv->set_offline)
+ return ccw_device_set_offline(cdev);
+ return 0;
}
static int online_store_recog_and_online(struct ccw_device *cdev)
{
- int ret;
-
/* Do device recognition, if needed. */
- if (cdev->id.cu_type == 0) {
- ret = ccw_device_recognition(cdev);
- if (ret) {
- printk(KERN_WARNING"Couldn't start recognition "
- "for device %s (ret=%d)\n",
- cdev->dev.bus_id, ret);
- return ret;
- }
+ if (cdev->private->state == DEV_STATE_BOXED) {
+ spin_lock_irq(cdev->ccwlock);
+ ccw_device_recognition(cdev);
+ spin_unlock_irq(cdev->ccwlock);
wait_event(cdev->private->wait_q,
cdev->private->flags.recog_done);
+ if (cdev->private->state != DEV_STATE_OFFLINE)
+ /* recognition failed */
+ return -EAGAIN;
}
if (cdev->drv && cdev->drv->set_online)
ccw_device_set_online(cdev);
return 0;
}
-static void online_store_handle_online(struct ccw_device *cdev, int force)
+
+static int online_store_handle_online(struct ccw_device *cdev, int force)
{
int ret;
ret = online_store_recog_and_online(cdev);
- if (ret)
- return;
+ if (ret && !force)
+ return ret;
if (force && cdev->private->state == DEV_STATE_BOXED) {
ret = ccw_device_stlck(cdev);
- if (ret) {
- printk(KERN_WARNING"ccw_device_stlck for device %s "
- "returned %d!\n", cdev->dev.bus_id, ret);
- return;
- }
+ if (ret)
+ return ret;
if (cdev->id.cu_type == 0)
cdev->private->state = DEV_STATE_NOT_OPER;
- online_store_recog_and_online(cdev);
+ ret = online_store_recog_and_online(cdev);
+ if (ret)
+ return ret;
}
-
+ return 0;
}
static ssize_t online_store (struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ccw_device *cdev = to_ccwdev(dev);
- int i, force;
- char *tmp;
+ int force, ret;
+ unsigned long i;
+ if (!dev_fsm_final_state(cdev) &&
+ cdev->private->state != DEV_STATE_DISCONNECTED)
+ return -EAGAIN;
if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
return -EAGAIN;
if (!strncmp(buf, "force\n", count)) {
force = 1;
i = 1;
+ ret = 0;
} else {
force = 0;
- i = simple_strtoul(buf, &tmp, 16);
+ ret = strict_strtoul(buf, 16, &i);
}
-
+ if (ret)
+ goto out;
switch (i) {
case 0:
- online_store_handle_offline(cdev);
+ ret = online_store_handle_offline(cdev);
break;
case 1:
- online_store_handle_online(cdev, force);
+ ret = online_store_handle_online(cdev, force);
break;
default:
- count = -EINVAL;
+ ret = -EINVAL;
}
+out:
if (cdev->drv)
module_put(cdev->drv->owner);
atomic_set(&cdev->private->onoff, 0);
- return count;
+ return (ret < 0) ? ret : count;
}
static ssize_t
static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
static DEVICE_ATTR(online, 0644, online_show, online_store);
-extern struct device_attribute dev_attr_cmb_enable;
static DEVICE_ATTR(availability, 0444, available_show, NULL);
-static struct attribute * subch_attrs[] = {
+static struct attribute *io_subchannel_attrs[] = {
&dev_attr_chpids.attr,
&dev_attr_pimpampom.attr,
NULL,
};
-static struct attribute_group subch_attr_group = {
- .attrs = subch_attrs,
-};
-
-struct attribute_group *subch_attr_groups[] = {
- &subch_attr_group,
- NULL,
+static struct attribute_group io_subchannel_attr_group = {
+ .attrs = io_subchannel_attrs,
};
static struct attribute * ccwdev_attrs[] = {
.attrs = ccwdev_attrs,
};
-struct attribute_group *ccwdev_attr_groups[] = {
+static const struct attribute_group *ccwdev_attr_groups[] = {
&ccwdev_attr_group,
NULL,
};
int ret;
dev->bus = &ccw_bus_type;
-
- if ((ret = device_add(dev)))
+ ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ if (ret)
return ret;
-
- set_bit(1, &cdev->private->registered);
- return ret;
-}
-
-struct match_data {
- struct ccw_dev_id dev_id;
- struct ccw_device * sibling;
-};
-
-static int
-match_devno(struct device * dev, void * data)
-{
- struct match_data * d = data;
- struct ccw_device * cdev;
-
- cdev = to_ccwdev(dev);
- if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
- !ccw_device_is_orphan(cdev) &&
- ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
- (cdev != d->sibling))
- return 1;
- return 0;
+ return device_add(dev);
}
-static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
- struct ccw_device *sibling)
+static int match_dev_id(struct device *dev, void *data)
{
- struct device *dev;
- struct match_data data;
-
- data.dev_id = *dev_id;
- data.sibling = sibling;
- dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
-
- return dev ? to_ccwdev(dev) : NULL;
-}
-
-static int match_orphan(struct device *dev, void *data)
-{
- struct ccw_dev_id *dev_id;
- struct ccw_device *cdev;
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_dev_id *dev_id = data;
- dev_id = data;
- cdev = to_ccwdev(dev);
return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
}
-static struct ccw_device *
-get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
- struct ccw_dev_id *dev_id)
+static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
{
struct device *dev;
- dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
- match_orphan);
+ dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
return dev ? to_ccwdev(dev) : NULL;
}
-static void
-ccw_device_add_changed(struct work_struct *work)
+static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
+ int ret;
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
- if (device_add(&cdev->dev)) {
- put_device(&cdev->dev);
- return;
+ if (device_is_registered(&cdev->dev)) {
+ device_release_driver(&cdev->dev);
+ ret = device_attach(&cdev->dev);
+ WARN_ON(ret == -ENODEV);
}
- set_bit(1, &cdev->private->registered);
-}
-
-void ccw_device_do_unreg_rereg(struct work_struct *work)
-{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
- struct subchannel *sch;
-
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
- sch = to_subchannel(cdev->dev.parent);
-
- ccw_device_unregister(cdev);
- PREPARE_WORK(&cdev->private->kick_work,
- ccw_device_add_changed);
- queue_work(ccw_device_work, &cdev->private->kick_work);
}
static void
struct ccw_device *cdev;
cdev = to_ccwdev(dev);
+ /* Release reference of parent subchannel. */
+ put_device(cdev->dev.parent);
kfree(cdev->private);
kfree(cdev);
}
return ERR_PTR(-ENOMEM);
}
+static void ccw_device_todo(struct work_struct *work);
+
static int io_subchannel_initialize_dev(struct subchannel *sch,
struct ccw_device *cdev)
{
atomic_set(&cdev->private->onoff, 0);
cdev->dev.parent = &sch->dev;
cdev->dev.release = ccw_device_release;
- INIT_LIST_HEAD(&cdev->private->kick_work.entry);
+ INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
cdev->dev.groups = ccwdev_attr_groups;
/* Do first half of device_register. */
device_initialize(&cdev->dev);
if (!get_device(&sch->dev)) {
- if (cdev->dev.release)
- cdev->dev.release(&cdev->dev);
+ /* Release reference from device_initialize(). */
+ put_device(&cdev->dev);
return -ENODEV;
}
+ cdev->private->flags.initialized = 1;
return 0;
}
cdev = io_subchannel_allocate_dev(sch);
if (!IS_ERR(cdev)) {
ret = io_subchannel_initialize_dev(sch, cdev);
- if (ret) {
- kfree(cdev);
+ if (ret)
cdev = ERR_PTR(ret);
- }
}
return cdev;
}
-static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
-
-static void sch_attach_device(struct subchannel *sch,
- struct ccw_device *cdev)
-{
- css_update_ssd_info(sch);
- spin_lock_irq(sch->lock);
- sch->dev.driver_data = cdev;
- cdev->private->schid = sch->schid;
- cdev->ccwlock = sch->lock;
- device_trigger_reprobe(sch);
- spin_unlock_irq(sch->lock);
-}
-
-static void sch_attach_disconnected_device(struct subchannel *sch,
- struct ccw_device *cdev)
-{
- struct subchannel *other_sch;
- int ret;
-
- other_sch = to_subchannel(get_device(cdev->dev.parent));
- ret = device_move(&cdev->dev, &sch->dev);
- if (ret) {
- CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
- "(ret=%d)!\n", cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, ret);
- put_device(&other_sch->dev);
- return;
- }
- other_sch->dev.driver_data = NULL;
- /* No need to keep a subchannel without ccw device around. */
- css_sch_device_unregister(other_sch);
- put_device(&other_sch->dev);
- sch_attach_device(sch, cdev);
-}
-
-static void sch_attach_orphaned_device(struct subchannel *sch,
- struct ccw_device *cdev)
-{
- int ret;
-
- /* Try to move the ccw device to its new subchannel. */
- ret = device_move(&cdev->dev, &sch->dev);
- if (ret) {
- CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
- "failed (ret=%d)!\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, ret);
- return;
- }
- sch_attach_device(sch, cdev);
-}
+static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
static void sch_create_and_recog_new_device(struct subchannel *sch)
{
css_sch_device_unregister(sch);
return;
}
- spin_lock_irq(sch->lock);
- sch->dev.driver_data = cdev;
- spin_unlock_irq(sch->lock);
/* Start recognition for the new ccw device. */
- if (io_subchannel_recog(cdev, sch)) {
- spin_lock_irq(sch->lock);
- sch->dev.driver_data = NULL;
- spin_unlock_irq(sch->lock);
- if (cdev->dev.release)
- cdev->dev.release(&cdev->dev);
- css_sch_device_unregister(sch);
- }
-}
-
-
-void ccw_device_move_to_orphanage(struct work_struct *work)
-{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
- struct ccw_device *replacing_cdev;
- struct subchannel *sch;
- int ret;
- struct channel_subsystem *css;
- struct ccw_dev_id dev_id;
-
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
- sch = to_subchannel(cdev->dev.parent);
- css = to_css(sch->dev.parent);
- dev_id.devno = sch->schib.pmcw.dev;
- dev_id.ssid = sch->schid.ssid;
-
- /*
- * Move the orphaned ccw device to the orphanage so the replacing
- * ccw device can take its place on the subchannel.
- */
- ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev);
- if (ret) {
- CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
- "(ret=%d)!\n", cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, ret);
- return;
- }
- cdev->ccwlock = css->pseudo_subchannel->lock;
- /*
- * Search for the replacing ccw device
- * - among the disconnected devices
- * - in the orphanage
- */
- replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
- if (replacing_cdev) {
- sch_attach_disconnected_device(sch, replacing_cdev);
- return;
- }
- replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
- if (replacing_cdev) {
- sch_attach_orphaned_device(sch, replacing_cdev);
- return;
- }
- sch_create_and_recog_new_device(sch);
+ io_subchannel_recog(cdev, sch);
}
/*
* Register recognized device.
*/
-static void
-io_subchannel_register(struct work_struct *work)
+static void io_subchannel_register(struct ccw_device *cdev)
{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
struct subchannel *sch;
int ret;
unsigned long flags;
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
sch = to_subchannel(cdev->dev.parent);
+ /*
+ * Check if subchannel is still registered. It may have become
+ * unregistered if a machine check hit us after finishing
+ * device recognition but before the register work could be
+ * queued.
+ */
+ if (!device_is_registered(&sch->dev))
+ goto out_err;
css_update_ssd_info(sch);
/*
* io_subchannel_register() will also be called after device
* be registered). We need to reprobe since we may now have sense id
* information.
*/
- if (klist_node_attached(&cdev->dev.knode_parent)) {
+ if (device_is_registered(&cdev->dev)) {
if (!cdev->drv) {
ret = device_reprobe(&cdev->dev);
if (ret)
/* We can't do much here. */
- dev_info(&cdev->dev, "device_reprobe() returned"
- " %d\n", ret);
+ CIO_MSG_EVENT(0, "device_reprobe() returned"
+ " %d for 0.%x.%04x\n", ret,
+ cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
}
goto out;
}
+ /*
+ * Now we know this subchannel will stay, we can throw
+ * our delayed uevent.
+ */
+ dev_set_uevent_suppress(&sch->dev, 0);
+ kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
/* make it known to the system */
ret = ccw_device_register(cdev);
if (ret) {
- printk (KERN_WARNING "%s: could not register %s\n",
- __func__, cdev->dev.bus_id);
- put_device(&cdev->dev);
+ CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
+ cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno, ret);
spin_lock_irqsave(sch->lock, flags);
- sch->dev.driver_data = NULL;
+ sch_set_cdev(sch, NULL);
spin_unlock_irqrestore(sch->lock, flags);
- kfree (cdev->private);
- kfree (cdev);
- put_device(&sch->dev);
- if (atomic_dec_and_test(&ccw_device_init_count))
- wake_up(&ccw_device_init_wq);
- return;
+ /* Release initial device reference. */
+ put_device(&cdev->dev);
+ goto out_err;
}
- put_device(&cdev->dev);
out:
cdev->private->flags.recog_done = 1;
- put_device(&sch->dev);
wake_up(&cdev->private->wait_q);
+out_err:
if (atomic_dec_and_test(&ccw_device_init_count))
wake_up(&ccw_device_init_wq);
}
-void
-ccw_device_call_sch_unregister(struct work_struct *work)
+static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
struct subchannel *sch;
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
+ /* Get subchannel reference for local processing. */
+ if (!get_device(cdev->dev.parent))
+ return;
sch = to_subchannel(cdev->dev.parent);
css_sch_device_unregister(sch);
- /* Reset intparm to zeroes. */
- sch->schib.pmcw.intparm = 0;
- cio_modify(sch);
- put_device(&cdev->dev);
+ /* Release subchannel reference for local processing. */
put_device(&sch->dev);
}
void
io_subchannel_recog_done(struct ccw_device *cdev)
{
- struct subchannel *sch;
-
if (css_init_done == 0) {
cdev->private->flags.recog_done = 1;
return;
}
switch (cdev->private->state) {
- case DEV_STATE_NOT_OPER:
+ case DEV_STATE_BOXED:
+ /* Device did not respond in time. */
+ case DEV_STATE_NOT_OPER:
cdev->private->flags.recog_done = 1;
/* Remove device found not operational. */
- if (!get_device(&cdev->dev))
- break;
- sch = to_subchannel(cdev->dev.parent);
- PREPARE_WORK(&cdev->private->kick_work,
- ccw_device_call_sch_unregister);
- queue_work(slow_path_wq, &cdev->private->kick_work);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
if (atomic_dec_and_test(&ccw_device_init_count))
wake_up(&ccw_device_init_wq);
break;
- case DEV_STATE_BOXED:
- /* Device did not respond in time. */
case DEV_STATE_OFFLINE:
/*
* We can't register the device in interrupt context so
* we schedule a work item.
*/
- if (!get_device(&cdev->dev))
- break;
- PREPARE_WORK(&cdev->private->kick_work,
- io_subchannel_register);
- queue_work(slow_path_wq, &cdev->private->kick_work);
+ ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
break;
}
}
-static int
-io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
+static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
{
- int rc;
struct ccw_device_private *priv;
- sch->dev.driver_data = cdev;
- sch->driver = &io_subchannel_driver;
cdev->ccwlock = sch->lock;
/* Init private data. */
init_waitqueue_head(&priv->wait_q);
init_timer(&priv->timer);
- /* Set an initial name for the device. */
- snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
- sch->schid.ssid, sch->schib.pmcw.dev);
-
/* Increase counter of devices currently in recognition. */
atomic_inc(&ccw_device_init_count);
/* Start async. device sensing. */
spin_lock_irq(sch->lock);
- rc = ccw_device_recognition(cdev);
+ sch_set_cdev(sch, cdev);
+ ccw_device_recognition(cdev);
spin_unlock_irq(sch->lock);
- if (rc) {
- if (atomic_dec_and_test(&ccw_device_init_count))
- wake_up(&ccw_device_init_wq);
- }
- return rc;
}
-static void ccw_device_move_to_sch(struct work_struct *work)
+static int ccw_device_move_to_sch(struct ccw_device *cdev,
+ struct subchannel *sch)
{
- struct ccw_device_private *priv;
- int rc;
- struct subchannel *sch;
- struct ccw_device *cdev;
- struct subchannel *former_parent;
+ struct subchannel *old_sch;
+ int rc, old_enabled = 0;
+
+ old_sch = to_subchannel(cdev->dev.parent);
+ /* Obtain child reference for new parent. */
+ if (!get_device(&sch->dev))
+ return -ENODEV;
+
+ if (!sch_is_pseudo_sch(old_sch)) {
+ spin_lock_irq(old_sch->lock);
+ old_enabled = old_sch->schib.pmcw.ena;
+ rc = 0;
+ if (old_enabled)
+ rc = cio_disable_subchannel(old_sch);
+ spin_unlock_irq(old_sch->lock);
+ if (rc == -EBUSY) {
+ /* Release child reference for new parent. */
+ put_device(&sch->dev);
+ return rc;
+ }
+ }
- priv = container_of(work, struct ccw_device_private, kick_work);
- sch = priv->sch;
- cdev = priv->cdev;
- former_parent = ccw_device_is_orphan(cdev) ?
- NULL : to_subchannel(get_device(cdev->dev.parent));
mutex_lock(&sch->reg_mutex);
- /* Try to move the ccw device to its new subchannel. */
- rc = device_move(&cdev->dev, &sch->dev);
+ rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
mutex_unlock(&sch->reg_mutex);
if (rc) {
- CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
- "0.%x.%04x failed (ret=%d)!\n",
+ CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no, rc);
- css_sch_device_unregister(sch);
- goto out;
+ sch->schib.pmcw.dev, rc);
+ if (old_enabled) {
+ /* Try to reenable the old subchannel. */
+ spin_lock_irq(old_sch->lock);
+ cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch);
+ spin_unlock_irq(old_sch->lock);
+ }
+ /* Release child reference for new parent. */
+ put_device(&sch->dev);
+ return rc;
}
- if (former_parent) {
- spin_lock_irq(former_parent->lock);
- former_parent->dev.driver_data = NULL;
- spin_unlock_irq(former_parent->lock);
- css_sch_device_unregister(former_parent);
- /* Reset intparm to zeroes. */
- former_parent->schib.pmcw.intparm = 0;
- cio_modify(former_parent);
+ /* Clean up old subchannel. */
+ if (!sch_is_pseudo_sch(old_sch)) {
+ spin_lock_irq(old_sch->lock);
+ sch_set_cdev(old_sch, NULL);
+ spin_unlock_irq(old_sch->lock);
+ css_schedule_eval(old_sch->schid);
}
- sch_attach_device(sch, cdev);
-out:
- if (former_parent)
- put_device(&former_parent->dev);
- put_device(&cdev->dev);
+ /* Release child reference for old parent. */
+ put_device(&old_sch->dev);
+ /* Initialize new subchannel. */
+ spin_lock_irq(sch->lock);
+ cdev->private->schid = sch->schid;
+ cdev->ccwlock = sch->lock;
+ if (!sch_is_pseudo_sch(sch))
+ sch_set_cdev(sch, cdev);
+ spin_unlock_irq(sch->lock);
+ if (!sch_is_pseudo_sch(sch))
+ css_update_ssd_info(sch);
+ return 0;
}
-static int
-io_subchannel_probe (struct subchannel *sch)
+static int ccw_device_move_to_orph(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct channel_subsystem *css = to_css(sch->dev.parent);
+
+ return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
+}
+
+static void io_subchannel_irq(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+
+ cdev = sch_get_cdev(sch);
+
+ CIO_TRACE_EVENT(6, "IRQ");
+ CIO_TRACE_EVENT(6, dev_name(&sch->dev));
+ if (cdev)
+ dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
+}
+
+void io_subchannel_init_config(struct subchannel *sch)
+{
+ memset(&sch->config, 0, sizeof(sch->config));
+ sch->config.csense = 1;
+}
+
+static void io_subchannel_init_fields(struct subchannel *sch)
+{
+ if (cio_is_console(sch->schid))
+ sch->opm = 0xff;
+ else
+ sch->opm = chp_get_sch_opm(sch);
+ sch->lpm = sch->schib.pmcw.pam & sch->opm;
+ sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
+
+ CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
+ " - PIM = %02X, PAM = %02X, POM = %02X\n",
+ sch->schib.pmcw.dev, sch->schid.ssid,
+ sch->schid.sch_no, sch->schib.pmcw.pim,
+ sch->schib.pmcw.pam, sch->schib.pmcw.pom);
+
+ io_subchannel_init_config(sch);
+}
+
+/*
+ * Note: We always return 0 so that we bind to the device even on error.
+ * This is needed so that our remove function is called on unregister.
+ */
+static int io_subchannel_probe(struct subchannel *sch)
{
struct ccw_device *cdev;
int rc;
- unsigned long flags;
- struct ccw_dev_id dev_id;
- if (sch->dev.driver_data) {
+ if (cio_is_console(sch->schid)) {
+ rc = sysfs_create_group(&sch->dev.kobj,
+ &io_subchannel_attr_group);
+ if (rc)
+ CIO_MSG_EVENT(0, "Failed to create io subchannel "
+ "attributes for subchannel "
+ "0.%x.%04x (rc=%d)\n",
+ sch->schid.ssid, sch->schid.sch_no, rc);
/*
- * This subchannel already has an associated ccw_device.
- * Register it and exit. This happens for all early
- * device, e.g. the console.
+ * The console subchannel already has an associated ccw_device.
+ * Throw the delayed uevent for the subchannel, register
+ * the ccw_device and exit.
*/
- cdev = sch->dev.driver_data;
+ dev_set_uevent_suppress(&sch->dev, 0);
+ kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
+ cdev = sch_get_cdev(sch);
+ cdev->dev.groups = ccwdev_attr_groups;
device_initialize(&cdev->dev);
+ cdev->private->flags.initialized = 1;
ccw_device_register(cdev);
/*
* Check if the device is already online. If it is
- * the reference count needs to be corrected
- * (see ccw_device_online and css_init_done for the
- * ugly details).
+ * the reference count needs to be corrected since we
+ * didn't obtain a reference in ccw_device_set_online.
*/
if (cdev->private->state != DEV_STATE_NOT_OPER &&
cdev->private->state != DEV_STATE_OFFLINE &&
get_device(&cdev->dev);
return 0;
}
- /*
- * First check if a fitting device may be found amongst the
- * disconnected devices or in the orphanage.
- */
- dev_id.devno = sch->schib.pmcw.dev;
- dev_id.ssid = sch->schid.ssid;
- cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
- if (!cdev)
- cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
- &dev_id);
- if (cdev) {
- /*
- * Schedule moving the device until when we have a registered
- * subchannel to move to and succeed the probe. We can
- * unregister later again, when the probe is through.
- */
- cdev->private->sch = sch;
- PREPARE_WORK(&cdev->private->kick_work,
- ccw_device_move_to_sch);
- queue_work(slow_path_wq, &cdev->private->kick_work);
- return 0;
- }
- cdev = io_subchannel_create_ccwdev(sch);
- if (IS_ERR(cdev))
- return PTR_ERR(cdev);
-
- rc = io_subchannel_recog(cdev, sch);
- if (rc) {
- spin_lock_irqsave(sch->lock, flags);
- sch->dev.driver_data = NULL;
- spin_unlock_irqrestore(sch->lock, flags);
- if (cdev->dev.release)
- cdev->dev.release(&cdev->dev);
- }
+ io_subchannel_init_fields(sch);
+ rc = cio_commit_config(sch);
+ if (rc)
+ goto out_schedule;
+ rc = sysfs_create_group(&sch->dev.kobj,
+ &io_subchannel_attr_group);
+ if (rc)
+ goto out_schedule;
+ /* Allocate I/O subchannel private data. */
+ sch->private = kzalloc(sizeof(struct io_subchannel_private),
+ GFP_KERNEL | GFP_DMA);
+ if (!sch->private)
+ goto out_schedule;
+ css_schedule_eval(sch->schid);
+ return 0;
- return rc;
+out_schedule:
+ spin_lock_irq(sch->lock);
+ css_sched_sch_todo(sch, SCH_TODO_UNREG);
+ spin_unlock_irq(sch->lock);
+ return 0;
}
static int
io_subchannel_remove (struct subchannel *sch)
{
struct ccw_device *cdev;
- unsigned long flags;
- if (!sch->dev.driver_data)
- return 0;
- cdev = sch->dev.driver_data;
+ cdev = sch_get_cdev(sch);
+ if (!cdev)
+ goto out_free;
+ io_subchannel_quiesce(sch);
/* Set ccw device to not operational and drop reference. */
- spin_lock_irqsave(cdev->ccwlock, flags);
- sch->dev.driver_data = NULL;
+ spin_lock_irq(cdev->ccwlock);
+ sch_set_cdev(sch, NULL);
cdev->private->state = DEV_STATE_NOT_OPER;
- spin_unlock_irqrestore(cdev->ccwlock, flags);
+ spin_unlock_irq(cdev->ccwlock);
ccw_device_unregister(cdev);
- put_device(&cdev->dev);
+out_free:
+ kfree(sch->private);
+ sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
return 0;
}
-static int
-io_subchannel_notify(struct device *dev, int event)
+static void io_subchannel_verify(struct subchannel *sch)
{
struct ccw_device *cdev;
- cdev = dev->driver_data;
- if (!cdev)
- return 0;
- if (!cdev->drv)
- return 0;
- if (!cdev->online)
- return 0;
- return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
-}
-
-static void
-io_subchannel_verify(struct device *dev)
-{
- struct ccw_device *cdev;
-
- cdev = dev->driver_data;
+ cdev = sch_get_cdev(sch);
if (cdev)
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
}
-static void
-io_subchannel_ioterm(struct device *dev)
+static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
{
struct ccw_device *cdev;
- cdev = dev->driver_data;
+ cdev = sch_get_cdev(sch);
if (!cdev)
return;
- /* Internal I/O will be retried by the interrupt handler. */
- if (cdev->private->flags.intretry)
- return;
- cdev->private->state = DEV_STATE_CLEAR_VERIFY;
- if (cdev->handler)
- cdev->handler(cdev, cdev->private->intparm,
- ERR_PTR(-EIO));
+ if (cio_update_schib(sch))
+ goto err;
+ /* Check for I/O on path. */
+ if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
+ goto out;
+ if (cdev->private->state == DEV_STATE_ONLINE) {
+ ccw_device_kill_io(cdev);
+ goto out;
+ }
+ if (cio_clear(sch))
+ goto err;
+out:
+ /* Trigger path verification. */
+ dev_fsm_event(cdev, DEV_EVENT_VERIFY);
+ return;
+
+err:
+ dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
}
-static void
-io_subchannel_shutdown(struct subchannel *sch)
+static int io_subchannel_chp_event(struct subchannel *sch,
+ struct chp_link *link, int event)
+{
+ int mask;
+
+ mask = chp_ssd_get_mask(&sch->ssd_info, link);
+ if (!mask)
+ return 0;
+ switch (event) {
+ case CHP_VARY_OFF:
+ sch->opm &= ~mask;
+ sch->lpm &= ~mask;
+ io_subchannel_terminate_path(sch, mask);
+ break;
+ case CHP_VARY_ON:
+ sch->opm |= mask;
+ sch->lpm |= mask;
+ io_subchannel_verify(sch);
+ break;
+ case CHP_OFFLINE:
+ if (cio_update_schib(sch))
+ return -ENODEV;
+ io_subchannel_terminate_path(sch, mask);
+ break;
+ case CHP_ONLINE:
+ if (cio_update_schib(sch))
+ return -ENODEV;
+ sch->lpm |= mask & sch->opm;
+ io_subchannel_verify(sch);
+ break;
+ }
+ return 0;
+}
+
+static void io_subchannel_quiesce(struct subchannel *sch)
{
struct ccw_device *cdev;
int ret;
- cdev = sch->dev.driver_data;
-
+ spin_lock_irq(sch->lock);
+ cdev = sch_get_cdev(sch);
if (cio_is_console(sch->schid))
- return;
+ goto out_unlock;
if (!sch->schib.pmcw.ena)
- /* Nothing to do. */
- return;
+ goto out_unlock;
ret = cio_disable_subchannel(sch);
if (ret != -EBUSY)
- /* Subchannel is disabled, we're done. */
- return;
- cdev->private->state = DEV_STATE_QUIESCE;
+ goto out_unlock;
if (cdev->handler)
- cdev->handler(cdev, cdev->private->intparm,
- ERR_PTR(-EIO));
- ret = ccw_device_cancel_halt_clear(cdev);
- if (ret == -EBUSY) {
- ccw_device_set_timeout(cdev, HZ/10);
- wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
+ cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
+ while (ret == -EBUSY) {
+ cdev->private->state = DEV_STATE_QUIESCE;
+ ret = ccw_device_cancel_halt_clear(cdev);
+ if (ret == -EBUSY) {
+ ccw_device_set_timeout(cdev, HZ/10);
+ spin_unlock_irq(sch->lock);
+ wait_event(cdev->private->wait_q,
+ cdev->private->state != DEV_STATE_QUIESCE);
+ spin_lock_irq(sch->lock);
+ }
+ ret = cio_disable_subchannel(sch);
}
+out_unlock:
+ spin_unlock_irq(sch->lock);
+}
+
+static void io_subchannel_shutdown(struct subchannel *sch)
+{
+ io_subchannel_quiesce(sch);
+}
+
+static int device_is_disconnected(struct ccw_device *cdev)
+{
+ if (!cdev)
+ return 0;
+ return (cdev->private->state == DEV_STATE_DISCONNECTED ||
+ cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
+}
+
+static int recovery_check(struct device *dev, void *data)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ int *redo = data;
+
+ spin_lock_irq(cdev->ccwlock);
+ switch (cdev->private->state) {
+ case DEV_STATE_DISCONNECTED:
+ CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
+ cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ dev_fsm_event(cdev, DEV_EVENT_VERIFY);
+ *redo = 1;
+ break;
+ case DEV_STATE_DISCONNECTED_SENSE_ID:
+ *redo = 1;
+ break;
+ }
+ spin_unlock_irq(cdev->ccwlock);
+
+ return 0;
+}
+
+static void recovery_work_func(struct work_struct *unused)
+{
+ int redo = 0;
+
+ bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
+ if (redo) {
+ spin_lock_irq(&recovery_lock);
+ if (!timer_pending(&recovery_timer)) {
+ if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
+ recovery_phase++;
+ mod_timer(&recovery_timer, jiffies +
+ recovery_delay[recovery_phase] * HZ);
+ }
+ spin_unlock_irq(&recovery_lock);
+ } else
+ CIO_MSG_EVENT(4, "recovery: end\n");
+}
+
+static DECLARE_WORK(recovery_work, recovery_work_func);
+
+static void recovery_func(unsigned long data)
+{
+ /*
+ * We can't do our recovery in softirq context and it's not
+ * performance critical, so we schedule it.
+ */
+ schedule_work(&recovery_work);
+}
+
+static void ccw_device_schedule_recovery(void)
+{
+ unsigned long flags;
+
+ CIO_MSG_EVENT(4, "recovery: schedule\n");
+ spin_lock_irqsave(&recovery_lock, flags);
+ if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
+ recovery_phase = 0;
+ mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
+ }
+ spin_unlock_irqrestore(&recovery_lock, flags);
+}
+
+static int purge_fn(struct device *dev, void *data)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_dev_id *id = &cdev->private->dev_id;
+
+ spin_lock_irq(cdev->ccwlock);
+ if (is_blacklisted(id->ssid, id->devno) &&
+ (cdev->private->state == DEV_STATE_OFFLINE)) {
+ CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
+ id->devno);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+ }
+ spin_unlock_irq(cdev->ccwlock);
+ /* Abort loop in case of pending signal. */
+ if (signal_pending(current))
+ return -EINTR;
+
+ return 0;
+}
+
+/**
+ * ccw_purge_blacklisted - purge unused, blacklisted devices
+ *
+ * Unregister all ccw devices that are offline and on the blacklist.
+ */
+int ccw_purge_blacklisted(void)
+{
+ CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
+ bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
+ return 0;
+}
+
+void ccw_device_set_disconnected(struct ccw_device *cdev)
+{
+ if (!cdev)
+ return;
+ ccw_device_set_timeout(cdev, 0);
+ cdev->private->flags.fake_irb = 0;
+ cdev->private->state = DEV_STATE_DISCONNECTED;
+ if (cdev->online)
+ ccw_device_schedule_recovery();
+}
+
+void ccw_device_set_notoper(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
+ CIO_TRACE_EVENT(2, "notoper");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
+ ccw_device_set_timeout(cdev, 0);
cio_disable_subchannel(sch);
+ cdev->private->state = DEV_STATE_NOT_OPER;
+}
+
+enum io_sch_action {
+ IO_SCH_UNREG,
+ IO_SCH_ORPH_UNREG,
+ IO_SCH_ATTACH,
+ IO_SCH_UNREG_ATTACH,
+ IO_SCH_ORPH_ATTACH,
+ IO_SCH_REPROBE,
+ IO_SCH_VERIFY,
+ IO_SCH_DISC,
+ IO_SCH_NOP,
+};
+
+static enum io_sch_action sch_get_action(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+
+ cdev = sch_get_cdev(sch);
+ if (cio_update_schib(sch)) {
+ /* Not operational. */
+ if (!cdev)
+ return IO_SCH_UNREG;
+ if (!ccw_device_notify(cdev, CIO_GONE))
+ return IO_SCH_UNREG;
+ return IO_SCH_ORPH_UNREG;
+ }
+ /* Operational. */
+ if (!cdev)
+ return IO_SCH_ATTACH;
+ if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
+ if (!ccw_device_notify(cdev, CIO_GONE))
+ return IO_SCH_UNREG_ATTACH;
+ return IO_SCH_ORPH_ATTACH;
+ }
+ if ((sch->schib.pmcw.pam & sch->opm) == 0) {
+ if (!ccw_device_notify(cdev, CIO_NO_PATH))
+ return IO_SCH_UNREG;
+ return IO_SCH_DISC;
+ }
+ if (device_is_disconnected(cdev))
+ return IO_SCH_REPROBE;
+ if (cdev->online)
+ return IO_SCH_VERIFY;
+ return IO_SCH_NOP;
+}
+
+/**
+ * io_subchannel_sch_event - process subchannel event
+ * @sch: subchannel
+ * @process: non-zero if function is called in process context
+ *
+ * An unspecified event occurred for this subchannel. Adjust data according
+ * to the current operational state of the subchannel and device. Return
+ * zero when the event has been handled sufficiently or -EAGAIN when this
+ * function should be called again in process context.
+ */
+static int io_subchannel_sch_event(struct subchannel *sch, int process)
+{
+ unsigned long flags;
+ struct ccw_device *cdev;
+ struct ccw_dev_id dev_id;
+ enum io_sch_action action;
+ int rc = -EAGAIN;
+
+ spin_lock_irqsave(sch->lock, flags);
+ if (!device_is_registered(&sch->dev))
+ goto out_unlock;
+ if (work_pending(&sch->todo_work))
+ goto out_unlock;
+ cdev = sch_get_cdev(sch);
+ if (cdev && work_pending(&cdev->private->todo_work))
+ goto out_unlock;
+ action = sch_get_action(sch);
+ CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
+ sch->schid.ssid, sch->schid.sch_no, process,
+ action);
+ /* Perform immediate actions while holding the lock. */
+ switch (action) {
+ case IO_SCH_REPROBE:
+ /* Trigger device recognition. */
+ ccw_device_trigger_reprobe(cdev);
+ rc = 0;
+ goto out_unlock;
+ case IO_SCH_VERIFY:
+ /* Trigger path verification. */
+ io_subchannel_verify(sch);
+ rc = 0;
+ goto out_unlock;
+ case IO_SCH_DISC:
+ ccw_device_set_disconnected(cdev);
+ rc = 0;
+ goto out_unlock;
+ case IO_SCH_ORPH_UNREG:
+ case IO_SCH_ORPH_ATTACH:
+ ccw_device_set_disconnected(cdev);
+ break;
+ case IO_SCH_UNREG_ATTACH:
+ case IO_SCH_UNREG:
+ if (cdev)
+ ccw_device_set_notoper(cdev);
+ break;
+ case IO_SCH_NOP:
+ rc = 0;
+ goto out_unlock;
+ default:
+ break;
+ }
+ spin_unlock_irqrestore(sch->lock, flags);
+ /* All other actions require process context. */
+ if (!process)
+ goto out;
+ /* Handle attached ccw device. */
+ switch (action) {
+ case IO_SCH_ORPH_UNREG:
+ case IO_SCH_ORPH_ATTACH:
+ /* Move ccw device to orphanage. */
+ rc = ccw_device_move_to_orph(cdev);
+ if (rc)
+ goto out;
+ break;
+ case IO_SCH_UNREG_ATTACH:
+ /* Unregister ccw device. */
+ ccw_device_unregister(cdev);
+ break;
+ default:
+ break;
+ }
+ /* Handle subchannel. */
+ switch (action) {
+ case IO_SCH_ORPH_UNREG:
+ case IO_SCH_UNREG:
+ css_sch_device_unregister(sch);
+ break;
+ case IO_SCH_ORPH_ATTACH:
+ case IO_SCH_UNREG_ATTACH:
+ case IO_SCH_ATTACH:
+ dev_id.ssid = sch->schid.ssid;
+ dev_id.devno = sch->schib.pmcw.dev;
+ cdev = get_ccwdev_by_dev_id(&dev_id);
+ if (!cdev) {
+ sch_create_and_recog_new_device(sch);
+ break;
+ }
+ rc = ccw_device_move_to_sch(cdev, sch);
+ if (rc) {
+ /* Release reference from get_ccwdev_by_dev_id() */
+ put_device(&cdev->dev);
+ goto out;
+ }
+ spin_lock_irqsave(sch->lock, flags);
+ ccw_device_trigger_reprobe(cdev);
+ spin_unlock_irqrestore(sch->lock, flags);
+ /* Release reference from get_ccwdev_by_dev_id() */
+ put_device(&cdev->dev);
+ break;
+ default:
+ break;
+ }
+ return 0;
+
+out_unlock:
+ spin_unlock_irqrestore(sch->lock, flags);
+out:
+ return rc;
}
#ifdef CONFIG_CCW_CONSOLE
return &ccw_console_lock;
}
-static int
-ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
+static int ccw_device_console_enable(struct ccw_device *cdev,
+ struct subchannel *sch)
{
int rc;
- /* Initialize the ccw_device structure. */
- cdev->dev.parent= &sch->dev;
- rc = io_subchannel_recog(cdev, sch);
+ /* Attach subchannel private data. */
+ sch->private = cio_get_console_priv();
+ memset(sch->private, 0, sizeof(struct io_subchannel_private));
+ io_subchannel_init_fields(sch);
+ rc = cio_commit_config(sch);
if (rc)
return rc;
-
+ sch->driver = &io_subchannel_driver;
+ /* Initialize the ccw_device structure. */
+ cdev->dev.parent= &sch->dev;
+ io_subchannel_recog(cdev, sch);
/* Now wait for the async. recognition to come to an end. */
spin_lock_irq(cdev->ccwlock);
while (!dev_fsm_final_state(cdev))
rc = 0;
out_unlock:
spin_unlock_irq(cdev->ccwlock);
- return 0;
+ return rc;
}
struct ccw_device *
console_cdev.online = 1;
return &console_cdev;
}
+
+static int ccw_device_pm_restore(struct device *dev);
+
+int ccw_device_force_console(void)
+{
+ if (!console_cdev_in_use)
+ return -ENODEV;
+ return ccw_device_pm_restore(&console_cdev.dev);
+}
+EXPORT_SYMBOL_GPL(ccw_device_force_console);
#endif
/*
bus_id = id;
- return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0);
+ return (strcmp(bus_id, dev_name(dev)) == 0);
}
-struct ccw_device *
-get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
+/**
+ * get_ccwdev_by_busid() - obtain device from a bus id
+ * @cdrv: driver the device is owned by
+ * @bus_id: bus id of the device to be searched
+ *
+ * This function searches all devices owned by @cdrv for a device with a bus
+ * id matching @bus_id.
+ * Returns:
+ * If a match is found, its reference count of the found device is increased
+ * and it is returned; else %NULL is returned.
+ */
+struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
+ const char *bus_id)
{
struct device *dev;
struct device_driver *drv;
struct ccw_driver *cdrv = cdev->drv;
int ret;
- pr_debug("removing device %s\n", cdev->dev.bus_id);
if (cdrv->remove)
cdrv->remove(cdev);
if (cdev->online) {
wait_event(cdev->private->wait_q,
dev_fsm_final_state(cdev));
else
- //FIXME: we can't fail!
- pr_debug("ccw_device_offline returned %d, device %s\n",
- ret, cdev->dev.bus_id);
+ CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
+ "device 0.%x.%04x\n",
+ ret, cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ /* Give up reference obtained in ccw_device_set_online(). */
+ put_device(&cdev->dev);
}
ccw_device_set_timeout(cdev, 0);
cdev->drv = NULL;
return 0;
}
+static void ccw_device_shutdown(struct device *dev)
+{
+ struct ccw_device *cdev;
+
+ cdev = to_ccwdev(dev);
+ if (cdev->drv && cdev->drv->shutdown)
+ cdev->drv->shutdown(cdev);
+ disable_cmf(cdev);
+}
+
+static int ccw_device_pm_prepare(struct device *dev)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+
+ if (work_pending(&cdev->private->todo_work))
+ return -EAGAIN;
+ /* Fail while device is being set online/offline. */
+ if (atomic_read(&cdev->private->onoff))
+ return -EAGAIN;
+
+ if (cdev->online && cdev->drv && cdev->drv->prepare)
+ return cdev->drv->prepare(cdev);
+
+ return 0;
+}
+
+static void ccw_device_pm_complete(struct device *dev)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+
+ if (cdev->online && cdev->drv && cdev->drv->complete)
+ cdev->drv->complete(cdev);
+}
+
+static int ccw_device_pm_freeze(struct device *dev)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ int ret, cm_enabled;
+
+ /* Fail suspend while device is in transistional state. */
+ if (!dev_fsm_final_state(cdev))
+ return -EAGAIN;
+ if (!cdev->online)
+ return 0;
+ if (cdev->drv && cdev->drv->freeze) {
+ ret = cdev->drv->freeze(cdev);
+ if (ret)
+ return ret;
+ }
+
+ spin_lock_irq(sch->lock);
+ cm_enabled = cdev->private->cmb != NULL;
+ spin_unlock_irq(sch->lock);
+ if (cm_enabled) {
+ /* Don't have the css write on memory. */
+ ret = ccw_set_cmf(cdev, 0);
+ if (ret)
+ return ret;
+ }
+ /* From here on, disallow device driver I/O. */
+ spin_lock_irq(sch->lock);
+ ret = cio_disable_subchannel(sch);
+ spin_unlock_irq(sch->lock);
+
+ return ret;
+}
+
+static int ccw_device_pm_thaw(struct device *dev)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ int ret, cm_enabled;
+
+ if (!cdev->online)
+ return 0;
+
+ spin_lock_irq(sch->lock);
+ /* Allow device driver I/O again. */
+ ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
+ cm_enabled = cdev->private->cmb != NULL;
+ spin_unlock_irq(sch->lock);
+ if (ret)
+ return ret;
+
+ if (cm_enabled) {
+ ret = ccw_set_cmf(cdev, 1);
+ if (ret)
+ return ret;
+ }
+
+ if (cdev->drv && cdev->drv->thaw)
+ ret = cdev->drv->thaw(cdev);
+
+ return ret;
+}
+
+static void __ccw_device_pm_restore(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
+ if (cio_is_console(sch->schid))
+ goto out;
+ /*
+ * While we were sleeping, devices may have gone or become
+ * available again. Kick re-detection.
+ */
+ spin_lock_irq(sch->lock);
+ cdev->private->flags.resuming = 1;
+ ccw_device_recognition(cdev);
+ spin_unlock_irq(sch->lock);
+ wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
+ cdev->private->state == DEV_STATE_DISCONNECTED);
+out:
+ cdev->private->flags.resuming = 0;
+}
+
+static int resume_handle_boxed(struct ccw_device *cdev)
+{
+ cdev->private->state = DEV_STATE_BOXED;
+ if (ccw_device_notify(cdev, CIO_BOXED))
+ return 0;
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+ return -ENODEV;
+}
+
+static int resume_handle_disc(struct ccw_device *cdev)
+{
+ cdev->private->state = DEV_STATE_DISCONNECTED;
+ if (ccw_device_notify(cdev, CIO_GONE))
+ return 0;
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+ return -ENODEV;
+}
+
+static int ccw_device_pm_restore(struct device *dev)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ int ret = 0, cm_enabled;
+
+ __ccw_device_pm_restore(cdev);
+ spin_lock_irq(sch->lock);
+ if (cio_is_console(sch->schid)) {
+ cio_enable_subchannel(sch, (u32)(addr_t)sch);
+ spin_unlock_irq(sch->lock);
+ goto out_restore;
+ }
+ cdev->private->flags.donotify = 0;
+ /* check recognition results */
+ switch (cdev->private->state) {
+ case DEV_STATE_OFFLINE:
+ break;
+ case DEV_STATE_BOXED:
+ ret = resume_handle_boxed(cdev);
+ spin_unlock_irq(sch->lock);
+ if (ret)
+ goto out;
+ goto out_restore;
+ case DEV_STATE_DISCONNECTED:
+ goto out_disc_unlock;
+ default:
+ goto out_unreg_unlock;
+ }
+ /* check if the device id has changed */
+ if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
+ CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
+ "changed from %04x to %04x)\n",
+ sch->schid.ssid, sch->schid.sch_no,
+ cdev->private->dev_id.devno,
+ sch->schib.pmcw.dev);
+ goto out_unreg_unlock;
+ }
+ /* check if the device type has changed */
+ if (!ccw_device_test_sense_data(cdev)) {
+ ccw_device_update_sense_data(cdev);
+ ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+ if (!cdev->online) {
+ ret = 0;
+ goto out_unlock;
+ }
+ ret = ccw_device_online(cdev);
+ if (ret)
+ goto out_disc_unlock;
+
+ cm_enabled = cdev->private->cmb != NULL;
+ spin_unlock_irq(sch->lock);
+
+ wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
+ if (cdev->private->state != DEV_STATE_ONLINE) {
+ spin_lock_irq(sch->lock);
+ goto out_disc_unlock;
+ }
+ if (cm_enabled) {
+ ret = ccw_set_cmf(cdev, 1);
+ if (ret) {
+ CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
+ "(rc=%d)\n", cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno, ret);
+ ret = 0;
+ }
+ }
+
+out_restore:
+ if (cdev->online && cdev->drv && cdev->drv->restore)
+ ret = cdev->drv->restore(cdev);
+out:
+ return ret;
+
+out_disc_unlock:
+ ret = resume_handle_disc(cdev);
+ spin_unlock_irq(sch->lock);
+ if (ret)
+ return ret;
+ goto out_restore;
+
+out_unreg_unlock:
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
+ ret = -ENODEV;
+out_unlock:
+ spin_unlock_irq(sch->lock);
+ return ret;
+}
+
+static const struct dev_pm_ops ccw_pm_ops = {
+ .prepare = ccw_device_pm_prepare,
+ .complete = ccw_device_pm_complete,
+ .freeze = ccw_device_pm_freeze,
+ .thaw = ccw_device_pm_thaw,
+ .restore = ccw_device_pm_restore,
+};
+
struct bus_type ccw_bus_type = {
.name = "ccw",
.match = ccw_bus_match,
.uevent = ccw_uevent,
.probe = ccw_device_probe,
.remove = ccw_device_remove,
+ .shutdown = ccw_device_shutdown,
+ .pm = &ccw_pm_ops,
};
-int
-ccw_driver_register (struct ccw_driver *cdriver)
+/**
+ * ccw_driver_register() - register a ccw driver
+ * @cdriver: driver to be registered
+ *
+ * This function is mainly a wrapper around driver_register().
+ * Returns:
+ * %0 on success and a negative error value on failure.
+ */
+int ccw_driver_register(struct ccw_driver *cdriver)
{
struct device_driver *drv = &cdriver->driver;
drv->bus = &ccw_bus_type;
drv->name = cdriver->name;
+ drv->owner = cdriver->owner;
return driver_register(drv);
}
-void
-ccw_driver_unregister (struct ccw_driver *cdriver)
+/**
+ * ccw_driver_unregister() - deregister a ccw driver
+ * @cdriver: driver to be deregistered
+ *
+ * This function is mainly a wrapper around driver_unregister().
+ */
+void ccw_driver_unregister(struct ccw_driver *cdriver)
{
driver_unregister(&cdriver->driver);
}
return sch->schid;
}
+static void ccw_device_todo(struct work_struct *work)
+{
+ struct ccw_device_private *priv;
+ struct ccw_device *cdev;
+ struct subchannel *sch;
+ enum cdev_todo todo;
+
+ priv = container_of(work, struct ccw_device_private, todo_work);
+ cdev = priv->cdev;
+ sch = to_subchannel(cdev->dev.parent);
+ /* Find out todo. */
+ spin_lock_irq(cdev->ccwlock);
+ todo = priv->todo;
+ priv->todo = CDEV_TODO_NOTHING;
+ CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
+ priv->dev_id.ssid, priv->dev_id.devno, todo);
+ spin_unlock_irq(cdev->ccwlock);
+ /* Perform todo. */
+ switch (todo) {
+ case CDEV_TODO_ENABLE_CMF:
+ cmf_reenable(cdev);
+ break;
+ case CDEV_TODO_REBIND:
+ ccw_device_do_unbind_bind(cdev);
+ break;
+ case CDEV_TODO_REGISTER:
+ io_subchannel_register(cdev);
+ break;
+ case CDEV_TODO_UNREG_EVAL:
+ if (!sch_is_pseudo_sch(sch))
+ css_schedule_eval(sch->schid);
+ /* fall-through */
+ case CDEV_TODO_UNREG:
+ if (sch_is_pseudo_sch(sch))
+ ccw_device_unregister(cdev);
+ else
+ ccw_device_call_sch_unregister(cdev);
+ break;
+ default:
+ break;
+ }
+ /* Release workqueue ref. */
+ put_device(&cdev->dev);
+}
+
+/**
+ * ccw_device_sched_todo - schedule ccw device operation
+ * @cdev: ccw device
+ * @todo: todo
+ *
+ * Schedule the operation identified by @todo to be performed on the slow path
+ * workqueue. Do nothing if another operation with higher priority is already
+ * scheduled. Needs to be called with ccwdev lock held.
+ */
+void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
+{
+ CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
+ cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
+ todo);
+ if (cdev->private->todo >= todo)
+ return;
+ cdev->private->todo = todo;
+ /* Get workqueue ref. */
+ if (!get_device(&cdev->dev))
+ return;
+ if (!queue_work(slow_path_wq, &cdev->private->todo_work)) {
+ /* Already queued, release workqueue ref. */
+ put_device(&cdev->dev);
+ }
+}
+
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccw_device_set_online);
EXPORT_SYMBOL(ccw_device_set_offline);
EXPORT_SYMBOL(get_ccwdev_by_busid);
EXPORT_SYMBOL(ccw_bus_type);
EXPORT_SYMBOL(ccw_device_work);
-EXPORT_SYMBOL(ccw_device_notify_work);
EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff