--- /dev/null
+/*
+ * bus driver for ccw devices
+ *
+ * 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/errno.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/kernel_stat.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"
+#include "chsc.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 };
+
+static atomic_t ccw_device_init_count = ATOMIC_INIT(0);
+static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq);
+static struct bus_type ccw_bus_type;
+
+/******************* bus type handling ***********************/
+
+/* The Linux driver model distinguishes between a bus type and
+ * the bus itself. Of course we only have one channel
+ * subsystem driver and one channel system per machine, but
+ * we still use the abstraction. T.R. says it's a good idea. */
+static int
+ccw_bus_match (struct device * dev, struct device_driver * drv)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_driver *cdrv = to_ccwdrv(drv);
+ const struct ccw_device_id *ids = cdrv->ids, *found;
+
+ if (!ids)
+ return 0;
+
+ found = ccw_device_id_match(ids, &cdev->id);
+ if (!found)
+ return 0;
+
+ cdev->id.driver_info = found->driver_info;
+
+ return 1;
+}
+
+/* Store modalias string delimited by prefix/suffix string into buffer with
+ * specified size. Return length of resulting string (excluding trailing '\0')
+ * even if string doesn't fit buffer (snprintf semantics). */
+static int snprint_alias(char *buf, size_t size,
+ struct ccw_device_id *id, const char *suffix)
+{
+ int len;
+
+ len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
+ if (len > size)
+ return len;
+ buf += len;
+ size -= len;
+
+ if (id->dev_type != 0)
+ len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
+ id->dev_model, suffix);
+ else
+ len += snprintf(buf, size, "dtdm%s", suffix);
+
+ return len;
+}
+
+/* Set up environment variables for ccw device uevent. Return 0 on success,
+ * non-zero otherwise. */
+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 ret;
+ char modalias_buf[30];
+
+ /* CU_TYPE= */
+ ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
+ if (ret)
+ return ret;
+
+ /* 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(env, "DEV_TYPE=%04X", id->dev_type);
+ if (ret)
+ return ret;
+
+ /* 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(env, "MODALIAS=%s", modalias_buf);
+ return ret;
+}
+
+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);
+
+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;
+}
+
+static int io_subchannel_settle(void)
+{
+ int ret;
+
+ ret = wait_event_interruptible(ccw_device_init_wq,
+ atomic_read(&ccw_device_init_count) == 0);
+ if (ret)
+ return -EINTR;
+ flush_workqueue(cio_work_q);
+ return 0;
+}
+
+static struct css_driver io_subchannel_driver = {
+ .drv = {
+ .owner = THIS_MODULE,
+ .name = "io_subchannel",
+ },
+ .subchannel_type = io_subchannel_ids,
+ .irq = io_subchannel_irq,
+ .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,
+};
+
+int __init io_subchannel_init(void)
+{
+ int ret;
+
+ setup_timer(&recovery_timer, recovery_func, 0);
+ ret = bus_register(&ccw_bus_type);
+ if (ret)
+ return ret;
+ ret = css_driver_register(&io_subchannel_driver);
+ if (ret)
+ bus_unregister(&ccw_bus_type);
+
+ return ret;
+}
+
+
+/************************ device handling **************************/
+
+/*
+ * A ccw_device has some interfaces in sysfs in addition to the
+ * standard ones.
+ * The following entries are designed to export the information which
+ * resided in 2.4 in /proc/subchannels. Subchannel and device number
+ * are obvious, so they don't have an entry :)
+ * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
+ */
+static ssize_t
+chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ struct chsc_ssd_info *ssd = &sch->ssd_info;
+ ssize_t ret = 0;
+ int chp;
+ int mask;
+
+ for (chp = 0; chp < 8; chp++) {
+ mask = 0x80 >> chp;
+ if (ssd->path_mask & mask)
+ ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
+ else
+ ret += sprintf(buf + ret, "00 ");
+ }
+ ret += sprintf (buf+ret, "\n");
+ return min((ssize_t)PAGE_SIZE, ret);
+}
+
+static ssize_t
+pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ struct pmcw *pmcw = &sch->schib.pmcw;
+
+ return sprintf (buf, "%02x %02x %02x\n",
+ pmcw->pim, pmcw->pam, pmcw->pom);
+}
+
+static ssize_t
+devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_device_id *id = &(cdev->id);
+
+ if (id->dev_type != 0)
+ return sprintf(buf, "%04x/%02x\n",
+ id->dev_type, id->dev_model);
+ else
+ return sprintf(buf, "n/a\n");
+}
+
+static ssize_t
+cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_device_id *id = &(cdev->id);
+
+ return sprintf(buf, "%04x/%02x\n",
+ id->cu_type, id->cu_model);
+}
+
+static ssize_t
+modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_device_id *id = &(cdev->id);
+ int len;
+
+ len = snprint_alias(buf, PAGE_SIZE, id, "\n");
+
+ return len > PAGE_SIZE ? PAGE_SIZE : len;
+}
+
+static ssize_t
+online_show (struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+
+ return sprintf(buf, cdev->online ? "1\n" : "0\n");
+}
+
+int ccw_device_is_orphan(struct ccw_device *cdev)
+{
+ return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
+}
+
+static void ccw_device_unregister(struct ccw_device *cdev)
+{
+ if (device_is_registered(&cdev->dev)) {
+ /* Undo device_add(). */
+ device_del(&cdev->dev);
+ }
+ if (cdev->private->flags.initialized) {
+ cdev->private->flags.initialized = 0;
+ /* Release reference from device_initialize(). */
+ put_device(&cdev->dev);
+ }
+}
+
+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)
+{
+ struct subchannel *sch;
+ int ret, state;
+
+ if (!cdev)
+ return -ENODEV;
+ if (!cdev->online || !cdev->drv)
+ return -EINVAL;
+
+ if (cdev->drv->set_offline) {
+ ret = cdev->drv->set_offline(cdev);
+ if (ret != 0)
+ return ret;
+ }
+ spin_lock_irq(cdev->ccwlock);
+ sch = to_subchannel(cdev->dev.parent);
+ cdev->online = 0;
+ /* 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);
+ }
+ 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);
+ 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));
+ }
+ /* 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;
+}
+
+/**
+ * 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);
+ spin_unlock_irq(cdev->ccwlock);
+ if (ret == 0)
+ wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
+ else {
+ 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;
+ }
+ 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;
+ }
+ spin_unlock_irq(cdev->ccwlock);
+ if (cdev->drv->set_online)
+ ret = cdev->drv->set_online(cdev);
+ if (ret)
+ goto rollback;
+
+ spin_lock_irq(cdev->ccwlock);
+ cdev->online = 1;
+ spin_unlock_irq(cdev->ccwlock);
+ return 0;
+
+rollback:
+ spin_lock_irq(cdev->ccwlock);
+ /* 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);
+ 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 int online_store_handle_offline(struct ccw_device *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);
+ return 0;
+ }
+ if (cdev->drv && cdev->drv->set_offline)
+ return ccw_device_set_offline(cdev);
+ return -EINVAL;
+}
+
+static int online_store_recog_and_online(struct ccw_device *cdev)
+{
+ /* Do device recognition, if needed. */
+ 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)
+ return ccw_device_set_online(cdev);
+ return -EINVAL;
+}
+
+static int online_store_handle_online(struct ccw_device *cdev, int force)
+{
+ int ret;
+
+ ret = online_store_recog_and_online(cdev);
+ if (ret && !force)
+ return ret;
+ if (force && cdev->private->state == DEV_STATE_BOXED) {
+ ret = ccw_device_stlck(cdev);
+ if (ret)
+ return ret;
+ if (cdev->id.cu_type == 0)
+ cdev->private->state = DEV_STATE_NOT_OPER;
+ 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 force, ret;
+ unsigned long i;
+
+ /* Prevent conflict between multiple on-/offline processing requests. */
+ if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
+ return -EAGAIN;
+ /* Prevent conflict between internal I/Os and on-/offline processing. */
+ if (!dev_fsm_final_state(cdev) &&
+ cdev->private->state != DEV_STATE_DISCONNECTED) {
+ ret = -EAGAIN;
+ goto out;
+ }
+ /* Prevent conflict between pending work and on-/offline processing.*/
+ if (work_pending(&cdev->private->todo_work)) {
+ ret = -EAGAIN;
+ goto out;
+ }
+ if (!strncmp(buf, "force\n", count)) {
+ force = 1;
+ i = 1;
+ ret = 0;
+ } else {
+ force = 0;
+ ret = kstrtoul(buf, 16, &i);
+ }
+ if (ret)
+ goto out;
+
+ device_lock(dev);
+ switch (i) {
+ case 0:
+ ret = online_store_handle_offline(cdev);
+ break;
+ case 1:
+ ret = online_store_handle_online(cdev, force);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ device_unlock(dev);
+
+out:
+ atomic_set(&cdev->private->onoff, 0);
+ return (ret < 0) ? ret : count;
+}
+
+static ssize_t
+available_show (struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct subchannel *sch;
+
+ if (ccw_device_is_orphan(cdev))
+ return sprintf(buf, "no device\n");
+ switch (cdev->private->state) {
+ case DEV_STATE_BOXED:
+ return sprintf(buf, "boxed\n");
+ case DEV_STATE_DISCONNECTED:
+ case DEV_STATE_DISCONNECTED_SENSE_ID:
+ case DEV_STATE_NOT_OPER:
+ sch = to_subchannel(dev->parent);
+ if (!sch->lpm)
+ return sprintf(buf, "no path\n");
+ else
+ return sprintf(buf, "no device\n");
+ default:
+ /* All other states considered fine. */
+ return sprintf(buf, "good\n");
+ }
+}
+
+static ssize_t
+initiate_logging(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ int rc;
+
+ rc = chsc_siosl(sch->schid);
+ if (rc < 0) {
+ pr_warning("Logging for subchannel 0.%x.%04x failed with "
+ "errno=%d\n",
+ sch->schid.ssid, sch->schid.sch_no, rc);
+ return rc;
+ }
+ pr_notice("Logging for subchannel 0.%x.%04x was triggered\n",
+ sch->schid.ssid, sch->schid.sch_no);
+ return count;
+}
+
+static ssize_t vpm_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct subchannel *sch = to_subchannel(dev);
+
+ return sprintf(buf, "%02x\n", sch->vpm);
+}
+
+static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
+static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
+static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
+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);
+static DEVICE_ATTR(availability, 0444, available_show, NULL);
+static DEVICE_ATTR(logging, 0200, NULL, initiate_logging);
+static DEVICE_ATTR(vpm, 0444, vpm_show, NULL);
+
+static struct attribute *io_subchannel_attrs[] = {
+ &dev_attr_chpids.attr,
+ &dev_attr_pimpampom.attr,
+ &dev_attr_logging.attr,
+ &dev_attr_vpm.attr,
+ NULL,
+};
+
+static struct attribute_group io_subchannel_attr_group = {
+ .attrs = io_subchannel_attrs,
+};
+
+static struct attribute * ccwdev_attrs[] = {
+ &dev_attr_devtype.attr,
+ &dev_attr_cutype.attr,
+ &dev_attr_modalias.attr,
+ &dev_attr_online.attr,
+ &dev_attr_cmb_enable.attr,
+ &dev_attr_availability.attr,
+ NULL,
+};
+
+static struct attribute_group ccwdev_attr_group = {
+ .attrs = ccwdev_attrs,
+};
+
+static const struct attribute_group *ccwdev_attr_groups[] = {
+ &ccwdev_attr_group,
+ NULL,
+};
+
+static int ccw_device_add(struct ccw_device *cdev)
+{
+ struct device *dev = &cdev->dev;
+
+ dev->bus = &ccw_bus_type;
+ return device_add(dev);
+}
+
+static int match_dev_id(struct device *dev, void *data)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_dev_id *dev_id = data;
+
+ return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
+}
+
+/**
+ * get_ccwdev_by_dev_id() - obtain device from a ccw device id
+ * @dev_id: id of the device to be searched
+ *
+ * This function searches all devices attached to the ccw bus for a device
+ * matching @dev_id.
+ * Returns:
+ * If a device is found its reference count is increased and returned;
+ * else %NULL is returned.
+ */
+struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
+{
+ struct device *dev;
+
+ dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
+
+ return dev ? to_ccwdev(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id);
+
+static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
+{
+ int ret;
+
+ if (device_is_registered(&cdev->dev)) {
+ device_release_driver(&cdev->dev);
+ ret = device_attach(&cdev->dev);
+ WARN_ON(ret == -ENODEV);
+ }
+}
+
+static void
+ccw_device_release(struct device *dev)
+{
+ struct ccw_device *cdev;
+
+ cdev = to_ccwdev(dev);
+ /* Release reference of parent subchannel. */
+ put_device(cdev->dev.parent);
+ kfree(cdev->private);
+ kfree(cdev);
+}
+
+static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+
+ cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
+ if (cdev) {
+ cdev->private = kzalloc(sizeof(struct ccw_device_private),
+ GFP_KERNEL | GFP_DMA);
+ if (cdev->private)
+ return cdev;
+ }
+ 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)
+{
+ struct ccw_device_private *priv = cdev->private;
+ int ret;
+
+ priv->cdev = cdev;
+ priv->int_class = IRQIO_CIO;
+ priv->state = DEV_STATE_NOT_OPER;
+ priv->dev_id.devno = sch->schib.pmcw.dev;
+ priv->dev_id.ssid = sch->schid.ssid;
+ priv->schid = sch->schid;
+
+ INIT_WORK(&priv->todo_work, ccw_device_todo);
+ INIT_LIST_HEAD(&priv->cmb_list);
+ init_waitqueue_head(&priv->wait_q);
+ init_timer(&priv->timer);
+
+ atomic_set(&priv->onoff, 0);
+ cdev->ccwlock = sch->lock;
+ cdev->dev.parent = &sch->dev;
+ cdev->dev.release = ccw_device_release;
+ cdev->dev.groups = ccwdev_attr_groups;
+ /* Do first half of device_register. */
+ device_initialize(&cdev->dev);
+ ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ if (ret)
+ goto out_put;
+ if (!get_device(&sch->dev)) {
+ ret = -ENODEV;
+ goto out_put;
+ }
+ priv->flags.initialized = 1;
+ spin_lock_irq(sch->lock);
+ sch_set_cdev(sch, cdev);
+ spin_unlock_irq(sch->lock);
+ return 0;
+
+out_put:
+ /* Release reference from device_initialize(). */
+ put_device(&cdev->dev);
+ return ret;
+}
+
+static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+ int ret;
+
+ cdev = io_subchannel_allocate_dev(sch);
+ if (!IS_ERR(cdev)) {
+ ret = io_subchannel_initialize_dev(sch, cdev);
+ if (ret)
+ cdev = ERR_PTR(ret);
+ }
+ return cdev;
+}
+
+static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
+
+static void sch_create_and_recog_new_device(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+
+ /* Need to allocate a new ccw device. */
+ cdev = io_subchannel_create_ccwdev(sch);
+ if (IS_ERR(cdev)) {
+ /* OK, we did everything we could... */
+ css_sch_device_unregister(sch);
+ return;
+ }
+ /* Start recognition for the new ccw device. */
+ io_subchannel_recog(cdev, sch);
+}
+
+/*
+ * Register recognized device.
+ */
+static void io_subchannel_register(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ int ret, adjust_init_count = 1;
+ unsigned long flags;
+
+ 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
+ * recognition has been done for a boxed device (which will already
+ * be registered). We need to reprobe since we may now have sense id
+ * information.
+ */
+ if (device_is_registered(&cdev->dev)) {
+ if (!cdev->drv) {
+ ret = device_reprobe(&cdev->dev);
+ if (ret)
+ /* We can't do much here. */
+ CIO_MSG_EVENT(0, "device_reprobe() returned"
+ " %d for 0.%x.%04x\n", ret,
+ cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ }
+ adjust_init_count = 0;
+ 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_add(cdev);
+ if (ret) {
+ 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_set_cdev(sch, NULL);
+ spin_unlock_irqrestore(sch->lock, flags);
+ /* Release initial device reference. */
+ put_device(&cdev->dev);
+ goto out_err;
+ }
+out:
+ cdev->private->flags.recog_done = 1;
+ wake_up(&cdev->private->wait_q);
+out_err:
+ if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count))
+ wake_up(&ccw_device_init_wq);
+}
+
+static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+
+ /* Get subchannel reference for local processing. */
+ if (!get_device(cdev->dev.parent))
+ return;
+ sch = to_subchannel(cdev->dev.parent);
+ css_sch_device_unregister(sch);
+ /* Release subchannel reference for local processing. */
+ put_device(&sch->dev);
+}
+
+/*
+ * subchannel recognition done. Called from the state machine.
+ */
+void
+io_subchannel_recog_done(struct ccw_device *cdev)
+{
+ if (css_init_done == 0) {
+ cdev->private->flags.recog_done = 1;
+ return;
+ }
+ switch (cdev->private->state) {
+ 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. */
+ 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_OFFLINE:
+ /*
+ * We can't register the device in interrupt context so
+ * we schedule a work item.
+ */
+ ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
+ break;
+ }
+}
+
+static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
+{
+ /* Increase counter of devices currently in recognition. */
+ atomic_inc(&ccw_device_init_count);
+
+ /* Start async. device sensing. */
+ spin_lock_irq(sch->lock);
+ ccw_device_recognition(cdev);
+ spin_unlock_irq(sch->lock);
+}
+
+static int ccw_device_move_to_sch(struct ccw_device *cdev,
+ struct subchannel *sch)
+{
+ 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;
+ }
+ }
+
+ mutex_lock(&sch->reg_mutex);
+ rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
+ mutex_unlock(&sch->reg_mutex);
+ if (rc) {
+ 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->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;
+ }
+ /* 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);
+ }
+ /* 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 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);
+ else
+ inc_irq_stat(IRQIO_CIO);
+}
+
+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 io_subchannel_private *io_priv;
+ struct ccw_device *cdev;
+ int rc;
+
+ 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);
+ /*
+ * The console subchannel already has an associated ccw_device.
+ * Throw the delayed uevent for the subchannel, register
+ * the ccw_device and exit.
+ */
+ dev_set_uevent_suppress(&sch->dev, 0);
+ kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
+ cdev = sch_get_cdev(sch);
+ rc = ccw_device_add(cdev);
+ if (rc) {
+ /* Release online reference. */
+ put_device(&cdev->dev);
+ goto out_schedule;
+ }
+ if (atomic_dec_and_test(&ccw_device_init_count))
+ wake_up(&ccw_device_init_wq);
+ return 0;
+ }
+ 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. */
+ io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA);
+ if (!io_priv)
+ goto out_schedule;
+
+ set_io_private(sch, io_priv);
+ css_schedule_eval(sch->schid);
+ return 0;
+
+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 io_subchannel_private *io_priv = to_io_private(sch);
+ struct ccw_device *cdev;
+
+ 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_irq(cdev->ccwlock);
+ sch_set_cdev(sch, NULL);
+ set_io_private(sch, NULL);
+ cdev->private->state = DEV_STATE_NOT_OPER;
+ spin_unlock_irq(cdev->ccwlock);
+ ccw_device_unregister(cdev);
+out_free:
+ kfree(io_priv);
+ sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
+ return 0;
+}
+
+static void io_subchannel_verify(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+
+ cdev = sch_get_cdev(sch);
+ if (cdev)
+ dev_fsm_event(cdev, DEV_EVENT_VERIFY);
+}
+
+static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
+{
+ struct ccw_device *cdev;
+
+ cdev = sch_get_cdev(sch);
+ if (!cdev)
+ return;
+ 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 int io_subchannel_chp_event(struct subchannel *sch,
+ struct chp_link *link, int event)
+{
+ struct ccw_device *cdev = sch_get_cdev(sch);
+ 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;
+ if (cdev)
+ cdev->private->path_gone_mask |= mask;
+ io_subchannel_terminate_path(sch, mask);
+ break;
+ case CHP_VARY_ON:
+ sch->opm |= mask;
+ sch->lpm |= mask;
+ if (cdev)
+ cdev->private->path_new_mask |= mask;
+ io_subchannel_verify(sch);
+ break;
+ case CHP_OFFLINE:
+ if (cio_update_schib(sch))
+ return -ENODEV;
+ if (cdev)
+ cdev->private->path_gone_mask |= mask;
+ io_subchannel_terminate_path(sch, mask);
+ break;
+ case CHP_ONLINE:
+ if (cio_update_schib(sch))
+ return -ENODEV;
+ sch->lpm |= mask & sch->opm;
+ if (cdev)
+ cdev->private->path_new_mask |= mask;
+ io_subchannel_verify(sch);
+ break;
+ }
+ return 0;
+}
+
+static void io_subchannel_quiesce(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+ int ret;
+
+ spin_lock_irq(sch->lock);
+ cdev = sch_get_cdev(sch);
+ if (cio_is_console(sch->schid))
+ goto out_unlock;
+ if (!sch->schib.pmcw.ena)
+ goto out_unlock;
+ ret = cio_disable_subchannel(sch);
+ if (ret != -EBUSY)
+ goto out_unlock;
+ if (cdev->handler)
+ cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
+ while (ret == -EBUSY) {
+ cdev->private->state = DEV_STATE_QUIESCE;
+ cdev->private->iretry = 255;
+ 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) &&
+ (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) {
+ CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
+ id->devno);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+ atomic_set(&cdev->private->onoff, 0);
+ }
+ 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) != NOTIFY_OK)
+ 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) != NOTIFY_OK)
+ 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) != NOTIFY_OK)
+ return IO_SCH_UNREG;
+ return IO_SCH_DISC;
+ }
+ if (device_is_disconnected(cdev))
+ return IO_SCH_REPROBE;
+ if (cdev->online && !cdev->private->flags.resuming)
+ return IO_SCH_VERIFY;
+ if (cdev->private->state == DEV_STATE_NOT_OPER)
+ return IO_SCH_UNREG_ATTACH;
+ 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)
+ break;
+ if (cdev->private->state == DEV_STATE_SENSE_ID) {
+ /*
+ * Note: delayed work triggered by this event
+ * and repeated calls to sch_event are synchronized
+ * by the above check for work_pending(cdev).
+ */
+ dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
+ } else
+ 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:
+ spin_lock_irqsave(sch->lock, flags);
+ if (cdev->private->flags.resuming) {
+ /* Device will be handled later. */
+ rc = 0;
+ goto out_unlock;
+ }
+ sch_set_cdev(sch, NULL);
+ spin_unlock_irqrestore(sch->lock, flags);
+ /* Unregister ccw device. */
+ ccw_device_unregister(cdev);
+ break;
+ default:
+ break;
+ }
+ /* Handle subchannel. */
+ switch (action) {
+ case IO_SCH_ORPH_UNREG:
+ case IO_SCH_UNREG:
+ if (!cdev || !cdev->private->flags.resuming)
+ 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;
+}
+
+static void ccw_device_set_int_class(struct ccw_device *cdev)
+{
+ struct ccw_driver *cdrv = cdev->drv;
+
+ /* Note: we interpret class 0 in this context as an uninitialized
+ * field since it translates to a non-I/O interrupt class. */
+ if (cdrv->int_class != 0)
+ cdev->private->int_class = cdrv->int_class;
+ else
+ cdev->private->int_class = IRQIO_CIO;
+}
+
+#ifdef CONFIG_CCW_CONSOLE
+int __init ccw_device_enable_console(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ int rc;
+
+ if (!cdev->drv || !cdev->handler)
+ return -EINVAL;
+
+ io_subchannel_init_fields(sch);
+ rc = cio_commit_config(sch);
+ if (rc)
+ return rc;
+ sch->driver = &io_subchannel_driver;
+ 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))
+ ccw_device_wait_idle(cdev);
+
+ /* Hold on to an extra reference while device is online. */
+ get_device(&cdev->dev);
+ rc = ccw_device_online(cdev);
+ if (rc)
+ goto out_unlock;
+
+ while (!dev_fsm_final_state(cdev))
+ ccw_device_wait_idle(cdev);
+
+ if (cdev->private->state == DEV_STATE_ONLINE)
+ cdev->online = 1;
+ else
+ rc = -EIO;
+out_unlock:
+ spin_unlock_irq(cdev->ccwlock);
+ if (rc) /* Give up online reference since onlining failed. */
+ put_device(&cdev->dev);
+ return rc;
+}
+
+struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv)
+{
+ struct io_subchannel_private *io_priv;
+ struct ccw_device *cdev;
+ struct subchannel *sch;
+
+ sch = cio_probe_console();
+ if (IS_ERR(sch))
+ return ERR_CAST(sch);
+
+ io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA);
+ if (!io_priv) {
+ put_device(&sch->dev);
+ return ERR_PTR(-ENOMEM);
+ }
+ set_io_private(sch, io_priv);
+ cdev = io_subchannel_create_ccwdev(sch);
+ if (IS_ERR(cdev)) {
+ put_device(&sch->dev);
+ kfree(io_priv);
+ return cdev;
+ }
+ cdev->drv = drv;
+ ccw_device_set_int_class(cdev);
+ return cdev;
+}
+
+void __init ccw_device_destroy_console(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct io_subchannel_private *io_priv = to_io_private(sch);
+
+ set_io_private(sch, NULL);
+ put_device(&sch->dev);
+ put_device(&cdev->dev);
+ kfree(io_priv);
+}
+
+/**
+ * ccw_device_wait_idle() - busy wait for device to become idle
+ * @cdev: ccw device
+ *
+ * Poll until activity control is zero, that is, no function or data
+ * transfer is pending/active.
+ * Called with device lock being held.
+ */
+void ccw_device_wait_idle(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
+ while (1) {
+ cio_tsch(sch);
+ if (sch->schib.scsw.cmd.actl == 0)
+ break;
+ udelay_simple(100);
+ }
+}
+
+static int ccw_device_pm_restore(struct device *dev);
+
+int ccw_device_force_console(struct ccw_device *cdev)
+{
+ return ccw_device_pm_restore(&cdev->dev);
+}
+EXPORT_SYMBOL_GPL(ccw_device_force_console);
+#endif
+
+/*
+ * get ccw_device matching the busid, but only if owned by cdrv
+ */
+static int
+__ccwdev_check_busid(struct device *dev, void *id)
+{
+ char *bus_id;
+
+ bus_id = id;
+
+ return (strcmp(bus_id, dev_name(dev)) == 0);
+}
+
+
+/**
+ * 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;
+
+ dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id,
+ __ccwdev_check_busid);
+
+ return dev ? to_ccwdev(dev) : NULL;
+}
+
+/************************** device driver handling ************************/
+
+/* This is the implementation of the ccw_driver class. The probe, remove
+ * and release methods are initially very similar to the device_driver
+ * implementations, with the difference that they have ccw_device
+ * arguments.
+ *
+ * A ccw driver also contains the information that is needed for
+ * device matching.
+ */
+static int
+ccw_device_probe (struct device *dev)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
+ int ret;
+
+ cdev->drv = cdrv; /* to let the driver call _set_online */
+ ccw_device_set_int_class(cdev);
+ ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
+ if (ret) {
+ cdev->drv = NULL;
+ cdev->private->int_class = IRQIO_CIO;
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ccw_device_remove(struct device *dev)
+{
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_driver *cdrv = cdev->drv;
+ int ret;
+
+ if (cdrv->remove)
+ cdrv->remove(cdev);
+
+ spin_lock_irq(cdev->ccwlock);
+ if (cdev->online) {
+ cdev->online = 0;
+ ret = ccw_device_offline(cdev);
+ spin_unlock_irq(cdev->ccwlock);
+ if (ret == 0)
+ wait_event(cdev->private->wait_q,
+ dev_fsm_final_state(cdev));
+ else
+ 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);
+ spin_lock_irq(cdev->ccwlock);
+ }
+ ccw_device_set_timeout(cdev, 0);
+ cdev->drv = NULL;
+ cdev->private->int_class = IRQIO_CIO;
+ spin_unlock_irq(cdev->ccwlock);
+ 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);
+
+ spin_lock_irq(sch->lock);
+ if (cio_is_console(sch->schid)) {
+ cio_enable_subchannel(sch, (u32)(addr_t)sch);
+ goto out_unlock;
+ }
+ /*
+ * While we were sleeping, devices may have gone or become
+ * available again. Kick re-detection.
+ */
+ cdev->private->flags.resuming = 1;
+ cdev->private->path_new_mask = LPM_ANYPATH;
+ css_sched_sch_todo(sch, SCH_TODO_EVAL);
+ spin_unlock_irq(sch->lock);
+ css_wait_for_slow_path();
+
+ /* cdev may have been moved to a different subchannel. */
+ sch = to_subchannel(cdev->dev.parent);
+ spin_lock_irq(sch->lock);
+ if (cdev->private->state != DEV_STATE_ONLINE &&
+ cdev->private->state != DEV_STATE_OFFLINE)
+ goto out_unlock;
+
+ 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);
+ spin_lock_irq(sch->lock);
+
+out_unlock:
+ cdev->private->flags.resuming = 0;
+ spin_unlock_irq(sch->lock);
+}
+
+static int resume_handle_boxed(struct ccw_device *cdev)
+{
+ cdev->private->state = DEV_STATE_BOXED;
+ if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK)
+ 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) == NOTIFY_OK)
+ 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;
+ int ret = 0;
+
+ __ccw_device_pm_restore(cdev);
+ sch = to_subchannel(cdev->dev.parent);
+ spin_lock_irq(sch->lock);
+ if (cio_is_console(sch->schid))
+ goto out_restore;
+
+ /* check recognition results */
+ switch (cdev->private->state) {
+ case DEV_STATE_OFFLINE:
+ case DEV_STATE_ONLINE:
+ cdev->private->flags.donotify = 0;
+ break;
+ case DEV_STATE_BOXED:
+ ret = resume_handle_boxed(cdev);
+ if (ret)
+ goto out_unlock;
+ goto out_restore;
+ default:
+ ret = resume_handle_disc(cdev);
+ if (ret)
+ goto out_unlock;
+ goto out_restore;
+ }
+ /* 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)
+ goto out_unlock;
+
+ if (ccw_device_online(cdev)) {
+ ret = resume_handle_disc(cdev);
+ if (ret)
+ goto out_unlock;
+ goto out_restore;
+ }
+ spin_unlock_irq(sch->lock);
+ wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
+ spin_lock_irq(sch->lock);
+
+ if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) {
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+
+ /* reenable cmf, if needed */
+ if (cdev->private->cmb) {
+ spin_unlock_irq(sch->lock);
+ ret = ccw_set_cmf(cdev, 1);
+ spin_lock_irq(sch->lock);
+ 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:
+ spin_unlock_irq(sch->lock);
+ if (cdev->online && cdev->drv && cdev->drv->restore)
+ ret = cdev->drv->restore(cdev);
+ return ret;
+
+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,
+};
+
+static 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,
+};
+
+/**
+ * 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;
+
+ return driver_register(drv);
+}
+
+/**
+ * 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);
+}
+
+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(cio_work_q, &cdev->private->todo_work)) {
+ /* Already queued, release workqueue ref. */
+ put_device(&cdev->dev);
+ }
+}
+
+/**
+ * ccw_device_siosl() - initiate logging
+ * @cdev: ccw device
+ *
+ * This function is used to invoke model-dependent logging within the channel
+ * subsystem.
+ */
+int ccw_device_siosl(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
+ return chsc_siosl(sch->schid);
+}
+EXPORT_SYMBOL_GPL(ccw_device_siosl);
+
+MODULE_LICENSE("GPL");
+EXPORT_SYMBOL(ccw_device_set_online);
+EXPORT_SYMBOL(ccw_device_set_offline);
+EXPORT_SYMBOL(ccw_driver_register);
+EXPORT_SYMBOL(ccw_driver_unregister);
+EXPORT_SYMBOL(get_ccwdev_by_busid);
Code Review / kvmfornfv.git / blobdiff