diff options
Diffstat (limited to 'drivers/s390/cio/device.c')
| -rw-r--r-- | drivers/s390/cio/device.c | 337 |
1 files changed, 180 insertions, 157 deletions
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 47269858ecb..dfef5e63cb7 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -1,8 +1,7 @@ /* - * drivers/s390/cio/device.c * bus driver for ccw devices * - * Copyright IBM Corp. 2002,2008 + * 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) @@ -20,6 +19,7 @@ #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> @@ -44,6 +44,10 @@ 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 @@ -128,8 +132,6 @@ static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) return ret; } -static struct bus_type ccw_bus_type; - static void io_subchannel_irq(struct subchannel *); static int io_subchannel_probe(struct subchannel *); static int io_subchannel_remove(struct subchannel *); @@ -138,8 +140,6 @@ 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); -wait_queue_head_t ccw_device_init_wq; -atomic_t ccw_device_init_count; static struct css_device_id io_subchannel_ids[] = { { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, @@ -192,10 +192,7 @@ int __init io_subchannel_init(void) { int ret; - init_waitqueue_head(&ccw_device_init_wq); - atomic_set(&ccw_device_init_count, 0); setup_timer(&recovery_timer, recovery_func, 0); - ret = bus_register(&ccw_bus_type); if (ret) return ret; @@ -336,9 +333,9 @@ int ccw_device_set_offline(struct ccw_device *cdev) if (ret != 0) return ret; } - cdev->online = 0; 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) { @@ -449,7 +446,10 @@ int ccw_device_set_online(struct ccw_device *cdev) 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: @@ -549,17 +549,12 @@ static ssize_t online_store (struct device *dev, struct device_attribute *attr, if (!dev_fsm_final_state(cdev) && cdev->private->state != DEV_STATE_DISCONNECTED) { ret = -EAGAIN; - goto out_onoff; + goto out; } /* Prevent conflict between pending work and on-/offline processing.*/ if (work_pending(&cdev->private->todo_work)) { ret = -EAGAIN; - goto out_onoff; - } - - if (cdev->drv && !try_module_get(cdev->drv->driver.owner)) { - ret = -EINVAL; - goto out_onoff; + goto out; } if (!strncmp(buf, "force\n", count)) { force = 1; @@ -567,10 +562,12 @@ static ssize_t online_store (struct device *dev, struct device_attribute *attr, ret = 0; } else { force = 0; - ret = strict_strtoul(buf, 16, &i); + ret = kstrtoul(buf, 16, &i); } if (ret) goto out; + + device_lock(dev); switch (i) { case 0: ret = online_store_handle_offline(cdev); @@ -581,10 +578,9 @@ static ssize_t online_store (struct device *dev, struct device_attribute *attr, default: ret = -EINVAL; } + device_unlock(dev); + out: - if (cdev->drv) - module_put(cdev->drv->driver.owner); -out_onoff: atomic_set(&cdev->private->onoff, 0); return (ret < 0) ? ret : count; } @@ -633,6 +629,14 @@ initiate_logging(struct device *dev, struct device_attribute *attr, return count; } +static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + + return sprintf(buf, "%02x\n", sch->vpm); +} + static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); @@ -641,11 +645,13 @@ static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); static DEVICE_ATTR(online, 0644, online_show, online_store); static DEVICE_ATTR(availability, 0444, available_show, NULL); static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); +static DEVICE_ATTR(vpm, 0444, vpm_show, NULL); static struct attribute *io_subchannel_attrs[] = { &dev_attr_chpids.attr, &dev_attr_pimpampom.attr, &dev_attr_logging.attr, + &dev_attr_vpm.attr, NULL, }; @@ -672,18 +678,11 @@ static const struct attribute_group *ccwdev_attr_groups[] = { NULL, }; -/* this is a simple abstraction for device_register that sets the - * correct bus type and adds the bus specific files */ -static int ccw_device_register(struct ccw_device *cdev) +static int ccw_device_add(struct ccw_device *cdev) { struct device *dev = &cdev->dev; - int ret; dev->bus = &ccw_bus_type; - ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, - cdev->private->dev_id.devno); - if (ret) - return ret; return device_add(dev); } @@ -695,7 +694,17 @@ static int match_dev_id(struct device *dev, void *data) return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); } -static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_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; @@ -703,6 +712,7 @@ static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *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) { @@ -747,22 +757,46 @@ static void ccw_device_todo(struct work_struct *work); static int io_subchannel_initialize_dev(struct subchannel *sch, struct ccw_device *cdev) { - cdev->private->cdev = cdev; - cdev->private->int_class = IOINT_CIO; - atomic_set(&cdev->private->onoff, 0); + struct ccw_device_private *priv = cdev->private; + int ret; + + priv->cdev = cdev; + priv->int_class = IRQIO_CIO; + priv->state = DEV_STATE_NOT_OPER; + priv->dev_id.devno = sch->schib.pmcw.dev; + priv->dev_id.ssid = sch->schid.ssid; + priv->schid = sch->schid; + + INIT_WORK(&priv->todo_work, ccw_device_todo); + INIT_LIST_HEAD(&priv->cmb_list); + init_waitqueue_head(&priv->wait_q); + init_timer(&priv->timer); + + atomic_set(&priv->onoff, 0); + cdev->ccwlock = sch->lock; cdev->dev.parent = &sch->dev; cdev->dev.release = ccw_device_release; - INIT_WORK(&cdev->private->todo_work, ccw_device_todo); cdev->dev.groups = ccwdev_attr_groups; /* Do first half of device_register. */ device_initialize(&cdev->dev); + 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)) { - /* Release reference from device_initialize(). */ - put_device(&cdev->dev); - return -ENODEV; + ret = -ENODEV; + goto out_put; } - cdev->private->flags.initialized = 1; + 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) @@ -841,7 +875,7 @@ static void io_subchannel_register(struct ccw_device *cdev) dev_set_uevent_suppress(&sch->dev, 0); kobject_uevent(&sch->dev.kobj, KOBJ_ADD); /* make it known to the system */ - ret = ccw_device_register(cdev); + 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, @@ -906,26 +940,11 @@ io_subchannel_recog_done(struct ccw_device *cdev) static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) { - struct ccw_device_private *priv; - - cdev->ccwlock = sch->lock; - - /* Init private data. */ - priv = cdev->private; - priv->dev_id.devno = sch->schib.pmcw.dev; - priv->dev_id.ssid = sch->schid.ssid; - priv->schid = sch->schid; - priv->state = DEV_STATE_NOT_OPER; - INIT_LIST_HEAD(&priv->cmb_list); - init_waitqueue_head(&priv->wait_q); - init_timer(&priv->timer); - /* Increase counter of devices currently in recognition. */ atomic_inc(&ccw_device_init_count); /* Start async. device sensing. */ spin_lock_irq(sch->lock); - sch_set_cdev(sch, cdev); ccw_device_recognition(cdev); spin_unlock_irq(sch->lock); } @@ -1013,7 +1032,7 @@ static void io_subchannel_irq(struct subchannel *sch) if (cdev) dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); else - kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++; + inc_irq_stat(IRQIO_CIO); } void io_subchannel_init_config(struct subchannel *sch) @@ -1066,19 +1085,14 @@ static int io_subchannel_probe(struct subchannel *sch) dev_set_uevent_suppress(&sch->dev, 0); kobject_uevent(&sch->dev.kobj, KOBJ_ADD); cdev = sch_get_cdev(sch); - cdev->dev.groups = ccwdev_attr_groups; - device_initialize(&cdev->dev); - cdev->private->flags.initialized = 1; - ccw_device_register(cdev); - /* - * Check if the device is already online. If it is - * the reference count needs to be corrected since we - * didn't obtain a reference in ccw_device_set_online. - */ - if (cdev->private->state != DEV_STATE_NOT_OPER && - cdev->private->state != DEV_STATE_OFFLINE && - cdev->private->state != DEV_STATE_BOXED) - get_device(&cdev->dev); + 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); @@ -1414,8 +1428,10 @@ static enum io_sch_action sch_get_action(struct subchannel *sch) } if (device_is_disconnected(cdev)) return IO_SCH_REPROBE; - if (cdev->online) + 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; } @@ -1457,12 +1473,6 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process) rc = 0; goto out_unlock; case IO_SCH_VERIFY: - if (cdev->private->flags.resuming == 1) { - if (cio_enable_subchannel(sch, (u32)(addr_t)sch)) { - ccw_device_set_notoper(cdev); - break; - } - } /* Trigger path verification. */ io_subchannel_verify(sch); rc = 0; @@ -1509,11 +1519,14 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process) 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; + goto out_unlock; } + sch_set_cdev(sch, NULL); + spin_unlock_irqrestore(sch->lock, flags); /* Unregister ccw device. */ ccw_device_unregister(cdev); break; @@ -1560,89 +1573,121 @@ out: return rc; } -#ifdef CONFIG_CCW_CONSOLE -static struct ccw_device console_cdev; -static struct ccw_device_private console_private; -static int console_cdev_in_use; - -static DEFINE_SPINLOCK(ccw_console_lock); - -spinlock_t * cio_get_console_lock(void) +static void ccw_device_set_int_class(struct ccw_device *cdev) { - return &ccw_console_lock; + 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; } -static int ccw_device_console_enable(struct ccw_device *cdev, - struct subchannel *sch) +#ifdef CONFIG_CCW_CONSOLE +int __init ccw_device_enable_console(struct ccw_device *cdev) { - struct io_subchannel_private *io_priv = cio_get_console_priv(); + struct subchannel *sch = to_subchannel(cdev->dev.parent); int rc; - /* Attach subchannel private data. */ - memset(io_priv, 0, sizeof(*io_priv)); - set_io_private(sch, io_priv); + 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; - /* Initialize the ccw_device structure. */ - cdev->dev.parent= &sch->dev; - sch_set_cdev(sch, cdev); 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)) - wait_cons_dev(); - rc = -EIO; - if (cdev->private->state != DEV_STATE_OFFLINE) + 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; - ccw_device_online(cdev); + while (!dev_fsm_final_state(cdev)) - wait_cons_dev(); - if (cdev->private->state != DEV_STATE_ONLINE) - goto out_unlock; - rc = 0; + 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 * -ccw_device_probe_console(void) +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; - int ret; - if (xchg(&console_cdev_in_use, 1) != 0) - return ERR_PTR(-EBUSY); sch = cio_probe_console(); - if (IS_ERR(sch)) { - console_cdev_in_use = 0; - return (void *) sch; + 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); } - memset(&console_cdev, 0, sizeof(struct ccw_device)); - memset(&console_private, 0, sizeof(struct ccw_device_private)); - console_cdev.private = &console_private; - console_private.cdev = &console_cdev; - console_private.int_class = IOINT_CIO; - ret = ccw_device_console_enable(&console_cdev, sch); - if (ret) { - cio_release_console(); - console_cdev_in_use = 0; - return ERR_PTR(ret); + 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); } - console_cdev.online = 1; - return &console_cdev; } static int ccw_device_pm_restore(struct device *dev); -int ccw_device_force_console(void) +int ccw_device_force_console(struct ccw_device *cdev) { - if (!console_cdev_in_use) - return -ENODEV; - return ccw_device_pm_restore(&console_cdev.dev); + return ccw_device_pm_restore(&cdev->dev); } EXPORT_SYMBOL_GPL(ccw_device_force_console); #endif @@ -1676,15 +1721,9 @@ struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) { struct device *dev; - struct device_driver *drv; - drv = get_driver(&cdrv->driver); - if (!drv) - return NULL; - - dev = driver_find_device(drv, NULL, (void *)bus_id, + dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, __ccwdev_check_busid); - put_driver(drv); return dev ? to_ccwdev(dev) : NULL; } @@ -1707,26 +1746,18 @@ ccw_device_probe (struct device *dev) int ret; cdev->drv = cdrv; /* to let the driver call _set_online */ - /* 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 = IOINT_CIO; - + ccw_device_set_int_class(cdev); ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; - if (ret) { cdev->drv = NULL; - cdev->private->int_class = IOINT_CIO; + cdev->private->int_class = IRQIO_CIO; return ret; } return 0; } -static int -ccw_device_remove (struct device *dev) +static int ccw_device_remove(struct device *dev) { struct ccw_device *cdev = to_ccwdev(dev); struct ccw_driver *cdrv = cdev->drv; @@ -1734,9 +1765,10 @@ ccw_device_remove (struct device *dev) if (cdrv->remove) cdrv->remove(cdev); + + spin_lock_irq(cdev->ccwlock); if (cdev->online) { cdev->online = 0; - spin_lock_irq(cdev->ccwlock); ret = ccw_device_offline(cdev); spin_unlock_irq(cdev->ccwlock); if (ret == 0) @@ -1749,10 +1781,12 @@ ccw_device_remove (struct device *dev) 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 = IOINT_CIO; + cdev->private->int_class = IRQIO_CIO; + spin_unlock_irq(cdev->ccwlock); return 0; } @@ -2033,16 +2067,6 @@ void ccw_driver_unregister(struct ccw_driver *cdriver) driver_unregister(&cdriver->driver); } -/* Helper func for qdio. */ -struct subchannel_id -ccw_device_get_subchannel_id(struct ccw_device *cdev) -{ - struct subchannel *sch; - - sch = to_subchannel(cdev->dev.parent); - return sch->schid; -} - static void ccw_device_todo(struct work_struct *work) { struct ccw_device_private *priv; @@ -2135,4 +2159,3 @@ EXPORT_SYMBOL(ccw_device_set_offline); EXPORT_SYMBOL(ccw_driver_register); EXPORT_SYMBOL(ccw_driver_unregister); EXPORT_SYMBOL(get_ccwdev_by_busid); -EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |