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![Sebastian Ott](/assets/img/avatar_default.png)
If the io_subchannel_driver is unbound from a subchannel it bluntly kills all I/O on the subchannel and sets the ccw_device state to not operable before deregistering the ccw_device. However, for online devices we should set the device offline (disband path groups etc.) which does not happen if the device is in not oper state. Simply deregister the ccw device - ccw_device_remove is smart enough to set the device offline properly. If everything fails call io_subchannel_quiesce afterwards as a safeguard. Reported-by: Shalini Chellathurai Saroja <shalini@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2122 lines
53 KiB
C
2122 lines
53 KiB
C
// SPDX-License-Identifier: GPL-1.0+
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/*
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* bus driver for ccw devices
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*
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* Copyright IBM Corp. 2002, 2008
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* Author(s): Arnd Bergmann (arndb@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#define KMSG_COMPONENT "cio"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/kernel_stat.h>
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#include <linux/sched/signal.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/param.h> /* HZ */
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#include <asm/cmb.h>
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#include <asm/isc.h>
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#include "chp.h"
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#include "cio.h"
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#include "cio_debug.h"
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#include "css.h"
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#include "device.h"
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#include "ioasm.h"
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#include "io_sch.h"
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#include "blacklist.h"
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#include "chsc.h"
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static struct timer_list recovery_timer;
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static DEFINE_SPINLOCK(recovery_lock);
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static int recovery_phase;
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static const unsigned long recovery_delay[] = { 3, 30, 300 };
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static atomic_t ccw_device_init_count = ATOMIC_INIT(0);
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static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq);
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static struct bus_type ccw_bus_type;
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/******************* bus type handling ***********************/
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/* The Linux driver model distinguishes between a bus type and
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* the bus itself. Of course we only have one channel
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* subsystem driver and one channel system per machine, but
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* we still use the abstraction. T.R. says it's a good idea. */
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static int
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ccw_bus_match (struct device * dev, struct device_driver * drv)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_driver *cdrv = to_ccwdrv(drv);
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const struct ccw_device_id *ids = cdrv->ids, *found;
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if (!ids)
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return 0;
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found = ccw_device_id_match(ids, &cdev->id);
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if (!found)
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return 0;
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cdev->id.driver_info = found->driver_info;
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return 1;
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}
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/* Store modalias string delimited by prefix/suffix string into buffer with
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* specified size. Return length of resulting string (excluding trailing '\0')
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* even if string doesn't fit buffer (snprintf semantics). */
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static int snprint_alias(char *buf, size_t size,
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struct ccw_device_id *id, const char *suffix)
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{
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int len;
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len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
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if (len > size)
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return len;
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buf += len;
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size -= len;
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if (id->dev_type != 0)
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len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
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id->dev_model, suffix);
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else
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len += snprintf(buf, size, "dtdm%s", suffix);
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return len;
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}
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/* Set up environment variables for ccw device uevent. Return 0 on success,
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* non-zero otherwise. */
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static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_device_id *id = &(cdev->id);
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int ret;
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char modalias_buf[30];
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/* CU_TYPE= */
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ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
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if (ret)
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return ret;
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/* CU_MODEL= */
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ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
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if (ret)
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return ret;
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/* The next two can be zero, that's ok for us */
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/* DEV_TYPE= */
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ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
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if (ret)
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return ret;
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/* DEV_MODEL= */
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ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
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if (ret)
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return ret;
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/* MODALIAS= */
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snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
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ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
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return ret;
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}
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static void io_subchannel_irq(struct subchannel *);
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static int io_subchannel_probe(struct subchannel *);
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static int io_subchannel_remove(struct subchannel *);
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static void io_subchannel_shutdown(struct subchannel *);
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static int io_subchannel_sch_event(struct subchannel *, int);
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static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
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int);
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static void recovery_func(struct timer_list *unused);
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static struct css_device_id io_subchannel_ids[] = {
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{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
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{ /* end of list */ },
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};
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static int io_subchannel_prepare(struct subchannel *sch)
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{
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struct ccw_device *cdev;
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/*
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* Don't allow suspend while a ccw device registration
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* is still outstanding.
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*/
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cdev = sch_get_cdev(sch);
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if (cdev && !device_is_registered(&cdev->dev))
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return -EAGAIN;
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return 0;
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}
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static int io_subchannel_settle(void)
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{
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int ret;
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ret = wait_event_interruptible(ccw_device_init_wq,
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atomic_read(&ccw_device_init_count) == 0);
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if (ret)
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return -EINTR;
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flush_workqueue(cio_work_q);
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return 0;
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}
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static struct css_driver io_subchannel_driver = {
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.drv = {
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.owner = THIS_MODULE,
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.name = "io_subchannel",
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},
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.subchannel_type = io_subchannel_ids,
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.irq = io_subchannel_irq,
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.sch_event = io_subchannel_sch_event,
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.chp_event = io_subchannel_chp_event,
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.probe = io_subchannel_probe,
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.remove = io_subchannel_remove,
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.shutdown = io_subchannel_shutdown,
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.prepare = io_subchannel_prepare,
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.settle = io_subchannel_settle,
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};
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int __init io_subchannel_init(void)
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{
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int ret;
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timer_setup(&recovery_timer, recovery_func, 0);
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ret = bus_register(&ccw_bus_type);
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if (ret)
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return ret;
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ret = css_driver_register(&io_subchannel_driver);
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if (ret)
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bus_unregister(&ccw_bus_type);
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return ret;
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}
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/************************ device handling **************************/
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static ssize_t
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devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_device_id *id = &(cdev->id);
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if (id->dev_type != 0)
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return sprintf(buf, "%04x/%02x\n",
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id->dev_type, id->dev_model);
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else
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return sprintf(buf, "n/a\n");
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}
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static ssize_t
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cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_device_id *id = &(cdev->id);
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return sprintf(buf, "%04x/%02x\n",
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id->cu_type, id->cu_model);
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}
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static ssize_t
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modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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struct ccw_device_id *id = &(cdev->id);
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int len;
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len = snprint_alias(buf, PAGE_SIZE, id, "\n");
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return len > PAGE_SIZE ? PAGE_SIZE : len;
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}
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static ssize_t
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online_show (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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return sprintf(buf, cdev->online ? "1\n" : "0\n");
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}
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int ccw_device_is_orphan(struct ccw_device *cdev)
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{
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return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
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}
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static void ccw_device_unregister(struct ccw_device *cdev)
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{
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if (device_is_registered(&cdev->dev)) {
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/* Undo device_add(). */
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device_del(&cdev->dev);
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}
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if (cdev->private->flags.initialized) {
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cdev->private->flags.initialized = 0;
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/* Release reference from device_initialize(). */
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put_device(&cdev->dev);
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}
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}
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static void io_subchannel_quiesce(struct subchannel *);
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/**
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* ccw_device_set_offline() - disable a ccw device for I/O
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* @cdev: target ccw device
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*
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* This function calls the driver's set_offline() function for @cdev, if
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* given, and then disables @cdev.
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* Returns:
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* %0 on success and a negative error value on failure.
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* Context:
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* enabled, ccw device lock not held
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*/
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int ccw_device_set_offline(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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int ret, state;
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if (!cdev)
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return -ENODEV;
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if (!cdev->online || !cdev->drv)
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return -EINVAL;
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if (cdev->drv->set_offline) {
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ret = cdev->drv->set_offline(cdev);
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if (ret != 0)
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return ret;
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}
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spin_lock_irq(cdev->ccwlock);
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sch = to_subchannel(cdev->dev.parent);
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cdev->online = 0;
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/* Wait until a final state or DISCONNECTED is reached */
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while (!dev_fsm_final_state(cdev) &&
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cdev->private->state != DEV_STATE_DISCONNECTED) {
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spin_unlock_irq(cdev->ccwlock);
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wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
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cdev->private->state == DEV_STATE_DISCONNECTED));
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spin_lock_irq(cdev->ccwlock);
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}
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do {
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ret = ccw_device_offline(cdev);
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if (!ret)
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break;
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CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
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"0.%x.%04x\n", ret, cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno);
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if (ret != -EBUSY)
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goto error;
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state = cdev->private->state;
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spin_unlock_irq(cdev->ccwlock);
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io_subchannel_quiesce(sch);
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spin_lock_irq(cdev->ccwlock);
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cdev->private->state = state;
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} while (ret == -EBUSY);
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spin_unlock_irq(cdev->ccwlock);
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wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
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cdev->private->state == DEV_STATE_DISCONNECTED));
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/* Inform the user if set offline failed. */
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if (cdev->private->state == DEV_STATE_BOXED) {
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pr_warn("%s: The device entered boxed state while being set offline\n",
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dev_name(&cdev->dev));
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} else if (cdev->private->state == DEV_STATE_NOT_OPER) {
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pr_warn("%s: The device stopped operating while being set offline\n",
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dev_name(&cdev->dev));
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}
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/* Give up reference from ccw_device_set_online(). */
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put_device(&cdev->dev);
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return 0;
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error:
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cdev->private->state = DEV_STATE_OFFLINE;
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dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
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spin_unlock_irq(cdev->ccwlock);
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/* Give up reference from ccw_device_set_online(). */
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put_device(&cdev->dev);
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return -ENODEV;
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}
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/**
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* ccw_device_set_online() - enable a ccw device for I/O
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* @cdev: target ccw device
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*
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* This function first enables @cdev and then calls the driver's set_online()
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* function for @cdev, if given. If set_online() returns an error, @cdev is
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* disabled again.
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* Returns:
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* %0 on success and a negative error value on failure.
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* Context:
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* enabled, ccw device lock not held
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*/
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int ccw_device_set_online(struct ccw_device *cdev)
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{
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int ret;
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int ret2;
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if (!cdev)
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return -ENODEV;
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if (cdev->online || !cdev->drv)
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return -EINVAL;
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/* Hold on to an extra reference while device is online. */
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if (!get_device(&cdev->dev))
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return -ENODEV;
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spin_lock_irq(cdev->ccwlock);
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ret = ccw_device_online(cdev);
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spin_unlock_irq(cdev->ccwlock);
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if (ret == 0)
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wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
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else {
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CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
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"device 0.%x.%04x\n",
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ret, cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno);
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/* Give up online reference since onlining failed. */
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put_device(&cdev->dev);
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return ret;
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}
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spin_lock_irq(cdev->ccwlock);
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/* Check if online processing was successful */
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if ((cdev->private->state != DEV_STATE_ONLINE) &&
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(cdev->private->state != DEV_STATE_W4SENSE)) {
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spin_unlock_irq(cdev->ccwlock);
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/* Inform the user that set online failed. */
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if (cdev->private->state == DEV_STATE_BOXED) {
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pr_warn("%s: Setting the device online failed because it is boxed\n",
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dev_name(&cdev->dev));
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} else if (cdev->private->state == DEV_STATE_NOT_OPER) {
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pr_warn("%s: Setting the device online failed because it is not operational\n",
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dev_name(&cdev->dev));
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}
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/* Give up online reference since onlining failed. */
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put_device(&cdev->dev);
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return -ENODEV;
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}
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spin_unlock_irq(cdev->ccwlock);
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if (cdev->drv->set_online)
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ret = cdev->drv->set_online(cdev);
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if (ret)
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goto rollback;
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spin_lock_irq(cdev->ccwlock);
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cdev->online = 1;
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spin_unlock_irq(cdev->ccwlock);
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return 0;
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|
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rollback:
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spin_lock_irq(cdev->ccwlock);
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/* Wait until a final state or DISCONNECTED is reached */
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while (!dev_fsm_final_state(cdev) &&
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cdev->private->state != DEV_STATE_DISCONNECTED) {
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spin_unlock_irq(cdev->ccwlock);
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wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
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cdev->private->state == DEV_STATE_DISCONNECTED));
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spin_lock_irq(cdev->ccwlock);
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}
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ret2 = ccw_device_offline(cdev);
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if (ret2)
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goto error;
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spin_unlock_irq(cdev->ccwlock);
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wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
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cdev->private->state == DEV_STATE_DISCONNECTED));
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/* Give up online reference since onlining failed. */
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put_device(&cdev->dev);
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return ret;
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|
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error:
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CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
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"device 0.%x.%04x\n",
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ret2, cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno);
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cdev->private->state = DEV_STATE_OFFLINE;
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spin_unlock_irq(cdev->ccwlock);
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/* Give up online reference since onlining failed. */
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put_device(&cdev->dev);
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return ret;
|
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}
|
|
|
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static int online_store_handle_offline(struct ccw_device *cdev)
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|
{
|
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if (cdev->private->state == DEV_STATE_DISCONNECTED) {
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spin_lock_irq(cdev->ccwlock);
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ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
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spin_unlock_irq(cdev->ccwlock);
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return 0;
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}
|
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if (cdev->drv && cdev->drv->set_offline)
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return ccw_device_set_offline(cdev);
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return -EINVAL;
|
|
}
|
|
|
|
static int online_store_recog_and_online(struct ccw_device *cdev)
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|
{
|
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/* Do device recognition, if needed. */
|
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if (cdev->private->state == DEV_STATE_BOXED) {
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spin_lock_irq(cdev->ccwlock);
|
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ccw_device_recognition(cdev);
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spin_unlock_irq(cdev->ccwlock);
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wait_event(cdev->private->wait_q,
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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_warn("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_RO(devtype);
|
|
static DEVICE_ATTR_RO(cutype);
|
|
static DEVICE_ATTR_RO(modalias);
|
|
static DEVICE_ATTR_RW(online);
|
|
static DEVICE_ATTR(availability, 0444, available_show, NULL);
|
|
static DEVICE_ATTR(logging, 0200, NULL, initiate_logging);
|
|
static DEVICE_ATTR_RO(vpm);
|
|
|
|
static struct attribute *io_subchannel_attrs[] = {
|
|
&dev_attr_logging.attr,
|
|
&dev_attr_vpm.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const 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 const 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;
|
|
|
|
INIT_WORK(&priv->todo_work, ccw_device_todo);
|
|
INIT_LIST_HEAD(&priv->cmb_list);
|
|
init_waitqueue_head(&priv->wait_q);
|
|
timer_setup(&priv->timer, ccw_device_timeout, 0);
|
|
|
|
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->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;
|
|
|
|
ccw_device_unregister(cdev);
|
|
spin_lock_irq(sch->lock);
|
|
sch_set_cdev(sch, NULL);
|
|
set_io_private(sch, NULL);
|
|
spin_unlock_irq(sch->lock);
|
|
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);
|
|
struct subchannel *sch;
|
|
int *redo = data;
|
|
|
|
spin_lock_irq(cdev->ccwlock);
|
|
switch (cdev->private->state) {
|
|
case DEV_STATE_ONLINE:
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
if ((sch->schib.pmcw.pam & sch->opm) == sch->vpm)
|
|
break;
|
|
/* fall through */
|
|
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(3, "recovery: end\n");
|
|
}
|
|
|
|
static DECLARE_WORK(recovery_work, recovery_work_func);
|
|
|
|
static void recovery_func(struct timer_list *unused)
|
|
{
|
|
/*
|
|
* We can't do our recovery in softirq context and it's not
|
|
* performance critical, so we schedule it.
|
|
*/
|
|
schedule_work(&recovery_work);
|
|
}
|
|
|
|
void ccw_device_schedule_recovery(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
CIO_MSG_EVENT(3, "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;
|
|
struct subchannel *sch;
|
|
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;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
io_subchannel_quiesce(sch);
|
|
__disable_cmf(cdev);
|
|
|
|
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);
|
|
|
|
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);
|