| /* |
| * 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) |
| * |
| * License: GPL |
| */ |
| |
| #define KMSG_COMPONENT "cio" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/export.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 <linux/sched/signal.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 */ }, |
| }; |
| |
| 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 **************************/ |
| |
| 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_warn("%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_warn("%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_warn("%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_warn("%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_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(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_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); |
| 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->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); |
| __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); |