| /* |
| * drivers/s390/cio/device.c |
| * 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) |
| */ |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/errno.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/list.h> |
| #include <linux/device.h> |
| #include <linux/workqueue.h> |
| #include <linux/timer.h> |
| |
| #include <asm/ccwdev.h> |
| #include <asm/cio.h> |
| #include <asm/param.h> /* HZ */ |
| #include <asm/cmb.h> |
| #include <asm/isc.h> |
| |
| #include "chp.h" |
| #include "cio.h" |
| #include "cio_debug.h" |
| #include "css.h" |
| #include "device.h" |
| #include "ioasm.h" |
| #include "io_sch.h" |
| #include "blacklist.h" |
| |
| static struct timer_list recovery_timer; |
| static DEFINE_SPINLOCK(recovery_lock); |
| static int recovery_phase; |
| static const unsigned long recovery_delay[] = { 3, 30, 300 }; |
| |
| /******************* bus type handling ***********************/ |
| |
| /* 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; |
| } |
| |
| 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 *); |
| 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 struct css_device_id io_subchannel_ids[] = { |
| { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, |
| { /* end of list */ }, |
| }; |
| MODULE_DEVICE_TABLE(css, io_subchannel_ids); |
| |
| static struct css_driver io_subchannel_driver = { |
| .owner = THIS_MODULE, |
| .subchannel_type = io_subchannel_ids, |
| .name = "io_subchannel", |
| .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, |
| }; |
| |
| struct workqueue_struct *ccw_device_work; |
| wait_queue_head_t ccw_device_init_wq; |
| atomic_t ccw_device_init_count; |
| |
| static void recovery_func(unsigned long data); |
| |
| static int __init |
| init_ccw_bus_type (void) |
| { |
| int ret; |
| |
| init_waitqueue_head(&ccw_device_init_wq); |
| atomic_set(&ccw_device_init_count, 0); |
| setup_timer(&recovery_timer, recovery_func, 0); |
| |
| ccw_device_work = create_singlethread_workqueue("cio"); |
| if (!ccw_device_work) |
| return -ENOMEM; /* FIXME: better errno ? */ |
| slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
| if (!slow_path_wq) { |
| ret = -ENOMEM; /* FIXME: better errno ? */ |
| goto out_err; |
| } |
| if ((ret = bus_register (&ccw_bus_type))) |
| goto out_err; |
| |
| ret = css_driver_register(&io_subchannel_driver); |
| if (ret) |
| goto out_err; |
| |
| wait_event(ccw_device_init_wq, |
| atomic_read(&ccw_device_init_count) == 0); |
| flush_workqueue(ccw_device_work); |
| return 0; |
| out_err: |
| if (ccw_device_work) |
| destroy_workqueue(ccw_device_work); |
| if (slow_path_wq) |
| destroy_workqueue(slow_path_wq); |
| return ret; |
| } |
| |
| static void __exit |
| cleanup_ccw_bus_type (void) |
| { |
| css_driver_unregister(&io_subchannel_driver); |
| bus_unregister(&ccw_bus_type); |
| destroy_workqueue(ccw_device_work); |
| } |
| |
| subsys_initcall(init_ccw_bus_type); |
| module_exit(cleanup_ccw_bus_type); |
| |
| /************************ device handling **************************/ |
| |
| /* |
| * A ccw_device has some interfaces in sysfs in addition to the |
| * standard ones. |
| * The following entries are designed to export the information which |
| * resided in 2.4 in /proc/subchannels. Subchannel and device number |
| * are obvious, so they don't have an entry :) |
| * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? |
| */ |
| static ssize_t |
| chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
| { |
| struct subchannel *sch = to_subchannel(dev); |
| struct chsc_ssd_info *ssd = &sch->ssd_info; |
| ssize_t ret = 0; |
| int chp; |
| int mask; |
| |
| for (chp = 0; chp < 8; chp++) { |
| mask = 0x80 >> chp; |
| if (ssd->path_mask & mask) |
| ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); |
| else |
| ret += sprintf(buf + ret, "00 "); |
| } |
| ret += sprintf (buf+ret, "\n"); |
| return min((ssize_t)PAGE_SIZE, ret); |
| } |
| |
| static ssize_t |
| pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
| { |
| struct subchannel *sch = to_subchannel(dev); |
| struct pmcw *pmcw = &sch->schib.pmcw; |
| |
| return sprintf (buf, "%02x %02x %02x\n", |
| pmcw->pim, pmcw->pam, pmcw->pom); |
| } |
| |
| static ssize_t |
| devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct ccw_device *cdev = to_ccwdev(dev); |
| struct ccw_device_id *id = &(cdev->id); |
| |
| if (id->dev_type != 0) |
| return sprintf(buf, "%04x/%02x\n", |
| id->dev_type, id->dev_model); |
| else |
| return sprintf(buf, "n/a\n"); |
| } |
| |
| static ssize_t |
| cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct ccw_device *cdev = to_ccwdev(dev); |
| struct ccw_device_id *id = &(cdev->id); |
| |
| return sprintf(buf, "%04x/%02x\n", |
| id->cu_type, id->cu_model); |
| } |
| |
| static ssize_t |
| modalias_show (struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct ccw_device *cdev = to_ccwdev(dev); |
| struct ccw_device_id *id = &(cdev->id); |
| int len; |
| |
| len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
| |
| return len > PAGE_SIZE ? PAGE_SIZE : len; |
| } |
| |
| static ssize_t |
| online_show (struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct ccw_device *cdev = to_ccwdev(dev); |
| |
| return sprintf(buf, cdev->online ? "1\n" : "0\n"); |
| } |
| |
| int ccw_device_is_orphan(struct ccw_device *cdev) |
| { |
| return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); |
| } |
| |
| static void ccw_device_unregister(struct ccw_device *cdev) |
| { |
| if (test_and_clear_bit(1, &cdev->private->registered)) |
| device_del(&cdev->dev); |
| } |
| |
| static void ccw_device_remove_orphan_cb(struct work_struct *work) |
| { |
| struct ccw_device_private *priv; |
| struct ccw_device *cdev; |
| |
| priv = container_of(work, struct ccw_device_private, kick_work); |
| cdev = priv->cdev; |
| ccw_device_unregister(cdev); |
| put_device(&cdev->dev); |
| /* Release cdev reference for workqueue processing. */ |
| put_device(&cdev->dev); |
| } |
| |
| static void ccw_device_call_sch_unregister(struct work_struct *work); |
| |
| static void |
| ccw_device_remove_disconnected(struct ccw_device *cdev) |
| { |
| unsigned long flags; |
| |
| /* |
| * Forced offline in disconnected state means |
| * 'throw away device'. |
| */ |
| /* Get cdev reference for workqueue processing. */ |
| if (!get_device(&cdev->dev)) |
| return; |
| if (ccw_device_is_orphan(cdev)) { |
| /* |
| * Deregister ccw device. |
| * Unfortunately, we cannot do this directly from the |
| * attribute method. |
| */ |
| spin_lock_irqsave(cdev->ccwlock, flags); |
| cdev->private->state = DEV_STATE_NOT_OPER; |
| spin_unlock_irqrestore(cdev->ccwlock, flags); |
| PREPARE_WORK(&cdev->private->kick_work, |
| ccw_device_remove_orphan_cb); |
| } else |
| /* Deregister subchannel, which will kill the ccw device. */ |
| PREPARE_WORK(&cdev->private->kick_work, |
| ccw_device_call_sch_unregister); |
| queue_work(slow_path_wq, &cdev->private->kick_work); |
| } |
| |
| /** |
| * ccw_device_set_offline() - disable a ccw device for I/O |
| * @cdev: target ccw device |
| * |
| * This function calls the driver's set_offline() function for @cdev, if |
| * given, and then disables @cdev. |
| * Returns: |
| * %0 on success and a negative error value on failure. |
| * Context: |
| * enabled, ccw device lock not held |
| */ |
| int ccw_device_set_offline(struct ccw_device *cdev) |
| { |
| int ret; |
| |
| 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; |
| } |
| cdev->online = 0; |
| spin_lock_irq(cdev->ccwlock); |
| ret = ccw_device_offline(cdev); |
| if (ret == -ENODEV) { |
| if (cdev->private->state != DEV_STATE_NOT_OPER) { |
| cdev->private->state = DEV_STATE_OFFLINE; |
| dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
| } |
| spin_unlock_irq(cdev->ccwlock); |
| return ret; |
| } |
| 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); |
| cdev->online = 1; |
| } |
| return ret; |
| } |
| |
| /** |
| * 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; |
| |
| if (!cdev) |
| return -ENODEV; |
| if (cdev->online || !cdev->drv) |
| return -EINVAL; |
| |
| 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); |
| return ret; |
| } |
| if (cdev->private->state != DEV_STATE_ONLINE) |
| return -ENODEV; |
| if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { |
| cdev->online = 1; |
| return 0; |
| } |
| spin_lock_irq(cdev->ccwlock); |
| 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); |
| return (ret == 0) ? -ENODEV : ret; |
| } |
| |
| static void online_store_handle_offline(struct ccw_device *cdev) |
| { |
| if (cdev->private->state == DEV_STATE_DISCONNECTED) |
| ccw_device_remove_disconnected(cdev); |
| else if (cdev->drv && cdev->drv->set_offline) |
| ccw_device_set_offline(cdev); |
| } |
| |
| static int online_store_recog_and_online(struct ccw_device *cdev) |
| { |
| int ret; |
| |
| /* Do device recognition, if needed. */ |
| if (cdev->id.cu_type == 0) { |
| ret = ccw_device_recognition(cdev); |
| if (ret) { |
| CIO_MSG_EVENT(0, "Couldn't start recognition " |
| "for device 0.%x.%04x (ret=%d)\n", |
| cdev->private->dev_id.ssid, |
| cdev->private->dev_id.devno, ret); |
| return ret; |
| } |
| wait_event(cdev->private->wait_q, |
| cdev->private->flags.recog_done); |
| } |
| if (cdev->drv && cdev->drv->set_online) |
| ccw_device_set_online(cdev); |
| return 0; |
| } |
| static int online_store_handle_online(struct ccw_device *cdev, int force) |
| { |
| int ret; |
| |
| ret = online_store_recog_and_online(cdev); |
| if (ret) |
| 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; |
| online_store_recog_and_online(cdev); |
| } |
| 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; |
| |
| if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
| return -EAGAIN; |
| |
| if (cdev->drv && !try_module_get(cdev->drv->owner)) { |
| atomic_set(&cdev->private->onoff, 0); |
| return -EINVAL; |
| } |
| if (!strncmp(buf, "force\n", count)) { |
| force = 1; |
| i = 1; |
| ret = 0; |
| } else { |
| force = 0; |
| ret = strict_strtoul(buf, 16, &i); |
| } |
| if (ret) |
| goto out; |
| switch (i) { |
| case 0: |
| online_store_handle_offline(cdev); |
| ret = count; |
| break; |
| case 1: |
| ret = online_store_handle_online(cdev, force); |
| if (!ret) |
| ret = count; |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| out: |
| if (cdev->drv) |
| module_put(cdev->drv->owner); |
| atomic_set(&cdev->private->onoff, 0); |
| return ret; |
| } |
| |
| 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 DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
| static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); |
| static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); |
| static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); |
| static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
| static DEVICE_ATTR(online, 0644, online_show, online_store); |
| static DEVICE_ATTR(availability, 0444, available_show, NULL); |
| |
| static struct attribute *io_subchannel_attrs[] = { |
| &dev_attr_chpids.attr, |
| &dev_attr_pimpampom.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group io_subchannel_attr_group = { |
| .attrs = io_subchannel_attrs, |
| }; |
| |
| static struct attribute * ccwdev_attrs[] = { |
| &dev_attr_devtype.attr, |
| &dev_attr_cutype.attr, |
| &dev_attr_modalias.attr, |
| &dev_attr_online.attr, |
| &dev_attr_cmb_enable.attr, |
| &dev_attr_availability.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group ccwdev_attr_group = { |
| .attrs = ccwdev_attrs, |
| }; |
| |
| static struct attribute_group *ccwdev_attr_groups[] = { |
| &ccwdev_attr_group, |
| 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) |
| { |
| struct device *dev = &cdev->dev; |
| int ret; |
| |
| dev->bus = &ccw_bus_type; |
| |
| if ((ret = device_add(dev))) |
| return ret; |
| |
| set_bit(1, &cdev->private->registered); |
| return ret; |
| } |
| |
| struct match_data { |
| struct ccw_dev_id dev_id; |
| struct ccw_device * sibling; |
| }; |
| |
| static int |
| match_devno(struct device * dev, void * data) |
| { |
| struct match_data * d = data; |
| struct ccw_device * cdev; |
| |
| cdev = to_ccwdev(dev); |
| if ((cdev->private->state == DEV_STATE_DISCONNECTED) && |
| !ccw_device_is_orphan(cdev) && |
| ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
| (cdev != d->sibling)) |
| return 1; |
| return 0; |
| } |
| |
| static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
| struct ccw_device *sibling) |
| { |
| struct device *dev; |
| struct match_data data; |
| |
| data.dev_id = *dev_id; |
| data.sibling = sibling; |
| dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
| |
| return dev ? to_ccwdev(dev) : NULL; |
| } |
| |
| static int match_orphan(struct device *dev, void *data) |
| { |
| struct ccw_dev_id *dev_id; |
| struct ccw_device *cdev; |
| |
| dev_id = data; |
| cdev = to_ccwdev(dev); |
| return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
| } |
| |
| static struct ccw_device * |
| get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, |
| struct ccw_dev_id *dev_id) |
| { |
| struct device *dev; |
| |
| dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, |
| match_orphan); |
| |
| return dev ? to_ccwdev(dev) : NULL; |
| } |
| |
| static void |
| ccw_device_add_changed(struct work_struct *work) |
| { |
| struct ccw_device_private *priv; |
| struct ccw_device *cdev; |
| |
| priv = container_of(work, struct ccw_device_private, kick_work); |
| cdev = priv->cdev; |
| if (device_add(&cdev->dev)) { |
| put_device(&cdev->dev); |
| return; |
| } |
| set_bit(1, &cdev->private->registered); |
| } |
| |
| void ccw_device_do_unreg_rereg(struct work_struct *work) |
| { |
| struct ccw_device_private *priv; |
| struct ccw_device *cdev; |
| struct subchannel *sch; |
| |
| priv = container_of(work, struct ccw_device_private, kick_work); |
| cdev = priv->cdev; |
| sch = to_subchannel(cdev->dev.parent); |
| |
| ccw_device_unregister(cdev); |
| PREPARE_WORK(&cdev->private->kick_work, |
| ccw_device_add_changed); |
| queue_work(ccw_device_work, &cdev->private->kick_work); |
| } |
| |
| static void |
| ccw_device_release(struct device *dev) |
| { |
| struct ccw_device *cdev; |
| |
| cdev = to_ccwdev(dev); |
| 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 int io_subchannel_initialize_dev(struct subchannel *sch, |
| struct ccw_device *cdev) |
| { |
| cdev->private->cdev = cdev; |
| atomic_set(&cdev->private->onoff, 0); |
| cdev->dev.parent = &sch->dev; |
| cdev->dev.release = ccw_device_release; |
| INIT_WORK(&cdev->private->kick_work, NULL); |
| cdev->dev.groups = ccwdev_attr_groups; |
| /* Do first half of device_register. */ |
| device_initialize(&cdev->dev); |
| if (!get_device(&sch->dev)) { |
| if (cdev->dev.release) |
| cdev->dev.release(&cdev->dev); |
| return -ENODEV; |
| } |
| return 0; |
| } |
| |
| 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) { |
| kfree(cdev); |
| cdev = ERR_PTR(ret); |
| } |
| } |
| return cdev; |
| } |
| |
| static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
| |
| static void sch_attach_device(struct subchannel *sch, |
| struct ccw_device *cdev) |
| { |
| css_update_ssd_info(sch); |
| spin_lock_irq(sch->lock); |
| sch_set_cdev(sch, cdev); |
| cdev->private->schid = sch->schid; |
| cdev->ccwlock = sch->lock; |
| ccw_device_trigger_reprobe(cdev); |
| spin_unlock_irq(sch->lock); |
| } |
| |
| static void sch_attach_disconnected_device(struct subchannel *sch, |
| struct ccw_device *cdev) |
| { |
| struct subchannel *other_sch; |
| int ret; |
| |
| other_sch = to_subchannel(get_device(cdev->dev.parent)); |
| ret = device_move(&cdev->dev, &sch->dev); |
| if (ret) { |
| CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed " |
| "(ret=%d)!\n", cdev->private->dev_id.ssid, |
| cdev->private->dev_id.devno, ret); |
| put_device(&other_sch->dev); |
| return; |
| } |
| sch_set_cdev(other_sch, NULL); |
| /* No need to keep a subchannel without ccw device around. */ |
| css_sch_device_unregister(other_sch); |
| put_device(&other_sch->dev); |
| sch_attach_device(sch, cdev); |
| } |
| |
| static void sch_attach_orphaned_device(struct subchannel *sch, |
| struct ccw_device *cdev) |
| { |
| int ret; |
| |
| /* Try to move the ccw device to its new subchannel. */ |
| ret = device_move(&cdev->dev, &sch->dev); |
| if (ret) { |
| CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " |
| "failed (ret=%d)!\n", |
| cdev->private->dev_id.ssid, |
| cdev->private->dev_id.devno, ret); |
| return; |
| } |
| sch_attach_device(sch, cdev); |
| } |
| |
| static void 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; |
| } |
| spin_lock_irq(sch->lock); |
| sch_set_cdev(sch, cdev); |
| spin_unlock_irq(sch->lock); |
| /* Start recognition for the new ccw device. */ |
| if (io_subchannel_recog(cdev, sch)) { |
| spin_lock_irq(sch->lock); |
| sch_set_cdev(sch, NULL); |
| spin_unlock_irq(sch->lock); |
| if (cdev->dev.release) |
| cdev->dev.release(&cdev->dev); |
| css_sch_device_unregister(sch); |
| } |
| } |
| |
| |
| void ccw_device_move_to_orphanage(struct work_struct *work) |
| { |
| struct ccw_device_private *priv; |
| struct ccw_device *cdev; |
| struct ccw_device *replacing_cdev; |
| struct subchannel *sch; |
| int ret; |
| struct channel_subsystem *css; |
| struct ccw_dev_id dev_id; |
| |
| priv = container_of(work, struct ccw_device_private, kick_work); |
| cdev = priv->cdev; |
| sch = to_subchannel(cdev->dev.parent); |
| css = to_css(sch->dev.parent); |
| dev_id.devno = sch->schib.pmcw.dev; |
| dev_id.ssid = sch->schid.ssid; |
| |
| /* |
| * Move the orphaned ccw device to the orphanage so the replacing |
| * ccw device can take its place on the subchannel. |
| */ |
| ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); |
| if (ret) { |
| CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " |
| "(ret=%d)!\n", cdev->private->dev_id.ssid, |
| cdev->private->dev_id.devno, ret); |
| return; |
| } |
| cdev->ccwlock = css->pseudo_subchannel->lock; |
| /* |
| * Search for the replacing ccw device |
| * - among the disconnected devices |
| * - in the orphanage |
| */ |
| replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); |
| if (replacing_cdev) { |
| sch_attach_disconnected_device(sch, replacing_cdev); |
| /* Release reference from get_disc_ccwdev_by_dev_id() */ |
| put_device(&cdev->dev); |
| return; |
| } |
| replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); |
| if (replacing_cdev) { |
| sch_attach_orphaned_device(sch, replacing_cdev); |
| /* Release reference from get_orphaned_ccwdev_by_dev_id() */ |
| put_device(&cdev->dev); |
| return; |
| } |
| sch_create_and_recog_new_device(sch); |
| } |
| |
| /* |
| * Register recognized device. |
| */ |
| static void |
| io_subchannel_register(struct work_struct *work) |
| { |
| struct ccw_device_private *priv; |
| struct ccw_device *cdev; |
| struct subchannel *sch; |
| int ret; |
| unsigned long flags; |
| |
| priv = container_of(work, struct ccw_device_private, kick_work); |
| cdev = priv->cdev; |
| sch = to_subchannel(cdev->dev.parent); |
| 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 (klist_node_attached(&cdev->dev.knode_parent)) { |
| 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); |
| } |
| goto out; |
| } |
| /* |
| * Now we know this subchannel will stay, we can throw |
| * our delayed uevent. |
| */ |
| sch->dev.uevent_suppress = 0; |
| kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
| /* make it known to the system */ |
| ret = ccw_device_register(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); |
| put_device(&cdev->dev); |
| spin_lock_irqsave(sch->lock, flags); |
| sch_set_cdev(sch, NULL); |
| spin_unlock_irqrestore(sch->lock, flags); |
| kfree (cdev->private); |
| kfree (cdev); |
| put_device(&sch->dev); |
| if (atomic_dec_and_test(&ccw_device_init_count)) |
| wake_up(&ccw_device_init_wq); |
| return; |
| } |
| put_device(&cdev->dev); |
| out: |
| cdev->private->flags.recog_done = 1; |
| put_device(&sch->dev); |
| wake_up(&cdev->private->wait_q); |
| if (atomic_dec_and_test(&ccw_device_init_count)) |
| wake_up(&ccw_device_init_wq); |
| } |
| |
| static void ccw_device_call_sch_unregister(struct work_struct *work) |
| { |
| struct ccw_device_private *priv; |
| struct ccw_device *cdev; |
| struct subchannel *sch; |
| |
| priv = container_of(work, struct ccw_device_private, kick_work); |
| cdev = priv->cdev; |
| /* Get subchannel reference for local processing. */ |
| if (!get_device(cdev->dev.parent)) |
| return; |
| sch = to_subchannel(cdev->dev.parent); |
| css_sch_device_unregister(sch); |
| /* Reset intparm to zeroes. */ |
| sch->schib.pmcw.intparm = 0; |
| cio_modify(sch); |
| /* Release cdev reference for workqueue processing.*/ |
| put_device(&cdev->dev); |
| /* 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) |
| { |
| struct subchannel *sch; |
| |
| if (css_init_done == 0) { |
| cdev->private->flags.recog_done = 1; |
| return; |
| } |
| switch (cdev->private->state) { |
| case DEV_STATE_NOT_OPER: |
| cdev->private->flags.recog_done = 1; |
| /* Remove device found not operational. */ |
| if (!get_device(&cdev->dev)) |
| break; |
| sch = to_subchannel(cdev->dev.parent); |
| PREPARE_WORK(&cdev->private->kick_work, |
| ccw_device_call_sch_unregister); |
| queue_work(slow_path_wq, &cdev->private->kick_work); |
| /* Release subchannel reference for asynchronous recognition. */ |
| put_device(&sch->dev); |
| if (atomic_dec_and_test(&ccw_device_init_count)) |
| wake_up(&ccw_device_init_wq); |
| break; |
| case DEV_STATE_BOXED: |
| /* Device did not respond in time. */ |
| case DEV_STATE_OFFLINE: |
| /* |
| * We can't register the device in interrupt context so |
| * we schedule a work item. |
| */ |
| if (!get_device(&cdev->dev)) |
| break; |
| PREPARE_WORK(&cdev->private->kick_work, |
| io_subchannel_register); |
| queue_work(slow_path_wq, &cdev->private->kick_work); |
| break; |
| } |
| } |
| |
| static int |
| io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
| { |
| int rc; |
| struct ccw_device_private *priv; |
| |
| sch_set_cdev(sch, cdev); |
| 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); |
| |
| /* Set an initial name for the device. */ |
| if (cio_is_console(sch->schid)) |
| cdev->dev.init_name = cio_get_console_cdev_name(sch); |
| else |
| dev_set_name(&cdev->dev, "0.%x.%04x", |
| sch->schid.ssid, sch->schib.pmcw.dev); |
| |
| /* Increase counter of devices currently in recognition. */ |
| atomic_inc(&ccw_device_init_count); |
| |
| /* Start async. device sensing. */ |
| spin_lock_irq(sch->lock); |
| rc = ccw_device_recognition(cdev); |
| spin_unlock_irq(sch->lock); |
| if (rc) { |
| if (atomic_dec_and_test(&ccw_device_init_count)) |
| wake_up(&ccw_device_init_wq); |
| } |
| return rc; |
| } |
| |
| static void ccw_device_move_to_sch(struct work_struct *work) |
| { |
| struct ccw_device_private *priv; |
| int rc; |
| struct subchannel *sch; |
| struct ccw_device *cdev; |
| struct subchannel *former_parent; |
| |
| priv = container_of(work, struct ccw_device_private, kick_work); |
| sch = priv->sch; |
| cdev = priv->cdev; |
| former_parent = ccw_device_is_orphan(cdev) ? |
| NULL : to_subchannel(get_device(cdev->dev.parent)); |
| mutex_lock(&sch->reg_mutex); |
| /* Try to move the ccw device to its new subchannel. */ |
| rc = device_move(&cdev->dev, &sch->dev); |
| mutex_unlock(&sch->reg_mutex); |
| if (rc) { |
| CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel " |
| "0.%x.%04x failed (ret=%d)!\n", |
| cdev->private->dev_id.ssid, |
| cdev->private->dev_id.devno, sch->schid.ssid, |
| sch->schid.sch_no, rc); |
| css_sch_device_unregister(sch); |
| goto out; |
| } |
| if (former_parent) { |
| spin_lock_irq(former_parent->lock); |
| sch_set_cdev(former_parent, NULL); |
| spin_unlock_irq(former_parent->lock); |
| css_sch_device_unregister(former_parent); |
| /* Reset intparm to zeroes. */ |
| former_parent->schib.pmcw.intparm = 0; |
| cio_modify(former_parent); |
| } |
| sch_attach_device(sch, cdev); |
| out: |
| if (former_parent) |
| put_device(&former_parent->dev); |
| put_device(&cdev->dev); |
| } |
| |
| static void io_subchannel_irq(struct subchannel *sch) |
| { |
| struct ccw_device *cdev; |
| |
| cdev = sch_get_cdev(sch); |
| |
| CIO_TRACE_EVENT(3, "IRQ"); |
| CIO_TRACE_EVENT(3, dev_name(&sch->dev)); |
| if (cdev) |
| dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); |
| } |
| |
| 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); |
| /* Initially set up some fields in the pmcw. */ |
| sch->schib.pmcw.ena = 0; |
| sch->schib.pmcw.csense = 1; /* concurrent sense */ |
| if ((sch->lpm & (sch->lpm - 1)) != 0) |
| sch->schib.pmcw.mp = 1; /* multipath mode */ |
| /* clean up possible residual cmf stuff */ |
| sch->schib.pmcw.mme = 0; |
| sch->schib.pmcw.mbfc = 0; |
| sch->schib.pmcw.mbi = 0; |
| sch->schib.mba = 0; |
| } |
| |
| static int io_subchannel_probe(struct subchannel *sch) |
| { |
| struct ccw_device *cdev; |
| int rc; |
| unsigned long flags; |
| struct ccw_dev_id dev_id; |
| |
| cdev = sch_get_cdev(sch); |
| if (cdev) { |
| rc = sysfs_create_group(&sch->dev.kobj, |
| &io_subchannel_attr_group); |
| if (rc) |
| CIO_MSG_EVENT(0, "Failed to create io subchannel " |
| "attributes for subchannel " |
| "0.%x.%04x (rc=%d)\n", |
| sch->schid.ssid, sch->schid.sch_no, rc); |
| /* |
| * This subchannel already has an associated ccw_device. |
| * Throw the delayed uevent for the subchannel, register |
| * the ccw_device and exit. This happens for all early |
| * devices, e.g. the console. |
| */ |
| sch->dev.uevent_suppress = 0; |
| kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
| cdev->dev.groups = ccwdev_attr_groups; |
| device_initialize(&cdev->dev); |
| ccw_device_register(cdev); |
| /* |
| * Check if the device is already online. If it is |
| * the reference count needs to be corrected |
| * (see ccw_device_online and css_init_done for the |
| * ugly details). |
| */ |
| if (cdev->private->state != DEV_STATE_NOT_OPER && |
| cdev->private->state != DEV_STATE_OFFLINE && |
| cdev->private->state != DEV_STATE_BOXED) |
| get_device(&cdev->dev); |
| return 0; |
| } |
| io_subchannel_init_fields(sch); |
| rc = sysfs_create_group(&sch->dev.kobj, |
| &io_subchannel_attr_group); |
| if (rc) |
| return rc; |
| /* Allocate I/O subchannel private data. */ |
| sch->private = kzalloc(sizeof(struct io_subchannel_private), |
| GFP_KERNEL | GFP_DMA); |
| if (!sch->private) { |
| rc = -ENOMEM; |
| goto out_err; |
| } |
| /* |
| * First check if a fitting device may be found amongst the |
| * disconnected devices or in the orphanage. |
| */ |
| dev_id.devno = sch->schib.pmcw.dev; |
| dev_id.ssid = sch->schid.ssid; |
| cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
| if (!cdev) |
| cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), |
| &dev_id); |
| if (cdev) { |
| /* |
| * Schedule moving the device until when we have a registered |
| * subchannel to move to and succeed the probe. We can |
| * unregister later again, when the probe is through. |
| */ |
| cdev->private->sch = sch; |
| PREPARE_WORK(&cdev->private->kick_work, |
| ccw_device_move_to_sch); |
| queue_work(slow_path_wq, &cdev->private->kick_work); |
| return 0; |
| } |
| cdev = io_subchannel_create_ccwdev(sch); |
| if (IS_ERR(cdev)) { |
| rc = PTR_ERR(cdev); |
| goto out_err; |
| } |
| rc = io_subchannel_recog(cdev, sch); |
| if (rc) { |
| spin_lock_irqsave(sch->lock, flags); |
| sch_set_cdev(sch, NULL); |
| spin_unlock_irqrestore(sch->lock, flags); |
| if (cdev->dev.release) |
| cdev->dev.release(&cdev->dev); |
| goto out_err; |
| } |
| return 0; |
| out_err: |
| kfree(sch->private); |
| sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
| return rc; |
| } |
| |
| static int |
| io_subchannel_remove (struct subchannel *sch) |
| { |
| struct ccw_device *cdev; |
| unsigned long flags; |
| |
| cdev = sch_get_cdev(sch); |
| if (!cdev) |
| return 0; |
| /* Set ccw device to not operational and drop reference. */ |
| spin_lock_irqsave(cdev->ccwlock, flags); |
| sch_set_cdev(sch, NULL); |
| cdev->private->state = DEV_STATE_NOT_OPER; |
| spin_unlock_irqrestore(cdev->ccwlock, flags); |
| ccw_device_unregister(cdev); |
| put_device(&cdev->dev); |
| kfree(sch->private); |
| sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
| return 0; |
| } |
| |
| static int io_subchannel_notify(struct subchannel *sch, int event) |
| { |
| struct ccw_device *cdev; |
| |
| cdev = sch_get_cdev(sch); |
| if (!cdev) |
| return 0; |
| return ccw_device_notify(cdev, event); |
| } |
| |
| 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 int check_for_io_on_path(struct subchannel *sch, int mask) |
| { |
| int cc; |
| |
| cc = stsch(sch->schid, &sch->schib); |
| if (cc) |
| return 0; |
| if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
| return 1; |
| return 0; |
| } |
| |
| static void terminate_internal_io(struct subchannel *sch, |
| struct ccw_device *cdev) |
| { |
| if (cio_clear(sch)) { |
| /* Recheck device in case clear failed. */ |
| sch->lpm = 0; |
| if (cdev->online) |
| dev_fsm_event(cdev, DEV_EVENT_VERIFY); |
| else |
| css_schedule_eval(sch->schid); |
| return; |
| } |
| cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
| /* Request retry of internal operation. */ |
| cdev->private->flags.intretry = 1; |
| /* Call handler. */ |
| if (cdev->handler) |
| cdev->handler(cdev, cdev->private->intparm, |
| ERR_PTR(-EIO)); |
| } |
| |
| static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
| { |
| struct ccw_device *cdev; |
| |
| cdev = sch_get_cdev(sch); |
| if (!cdev) |
| return; |
| if (check_for_io_on_path(sch, mask)) { |
| if (cdev->private->state == DEV_STATE_ONLINE) |
| ccw_device_kill_io(cdev); |
| else { |
| terminate_internal_io(sch, cdev); |
| /* Re-start path verification. */ |
| dev_fsm_event(cdev, DEV_EVENT_VERIFY); |
| } |
| } else |
| /* trigger path verification. */ |
| dev_fsm_event(cdev, DEV_EVENT_VERIFY); |
| |
| } |
| |
| static int io_subchannel_chp_event(struct subchannel *sch, |
| struct chp_link *link, int event) |
| { |
| int mask; |
| |
| mask = chp_ssd_get_mask(&sch->ssd_info, link); |
| if (!mask) |
| return 0; |
| switch (event) { |
| case CHP_VARY_OFF: |
| sch->opm &= ~mask; |
| sch->lpm &= ~mask; |
| io_subchannel_terminate_path(sch, mask); |
| break; |
| case CHP_VARY_ON: |
| sch->opm |= mask; |
| sch->lpm |= mask; |
| io_subchannel_verify(sch); |
| break; |
| case CHP_OFFLINE: |
| if (stsch(sch->schid, &sch->schib)) |
| return -ENXIO; |
| if (!css_sch_is_valid(&sch->schib)) |
| return -ENODEV; |
| io_subchannel_terminate_path(sch, mask); |
| break; |
| case CHP_ONLINE: |
| if (stsch(sch->schid, &sch->schib)) |
| return -ENXIO; |
| sch->lpm |= mask & sch->opm; |
| io_subchannel_verify(sch); |
| break; |
| } |
| return 0; |
| } |
| |
| static void |
| io_subchannel_shutdown(struct subchannel *sch) |
| { |
| struct ccw_device *cdev; |
| int ret; |
| |
| cdev = sch_get_cdev(sch); |
| |
| if (cio_is_console(sch->schid)) |
| return; |
| if (!sch->schib.pmcw.ena) |
| /* Nothing to do. */ |
| return; |
| ret = cio_disable_subchannel(sch); |
| if (ret != -EBUSY) |
| /* Subchannel is disabled, we're done. */ |
| return; |
| cdev->private->state = DEV_STATE_QUIESCE; |
| if (cdev->handler) |
| cdev->handler(cdev, cdev->private->intparm, |
| ERR_PTR(-EIO)); |
| ret = ccw_device_cancel_halt_clear(cdev); |
| if (ret == -EBUSY) { |
| ccw_device_set_timeout(cdev, HZ/10); |
| wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| } |
| cio_disable_subchannel(sch); |
| } |
| |
| static int io_subchannel_get_status(struct subchannel *sch) |
| { |
| struct schib schib; |
| |
| if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) |
| return CIO_GONE; |
| if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) |
| return CIO_REVALIDATE; |
| if (!sch->lpm) |
| return CIO_NO_PATH; |
| return CIO_OPER; |
| } |
| |
| 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_device_private *priv = cdev->private; |
| int unreg; |
| |
| spin_lock_irq(cdev->ccwlock); |
| unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) && |
| (priv->state == DEV_STATE_OFFLINE); |
| spin_unlock_irq(cdev->ccwlock); |
| if (!unreg) |
| goto out; |
| if (!get_device(&cdev->dev)) |
| goto out; |
| CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid, |
| priv->dev_id.devno); |
| PREPARE_WORK(&cdev->private->kick_work, ccw_device_call_sch_unregister); |
| queue_work(slow_path_wq, &cdev->private->kick_work); |
| |
| out: |
| /* 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; |
| } |
| |
| static void 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; |
| } |
| |
| static int io_subchannel_sch_event(struct subchannel *sch, int slow) |
| { |
| int event, ret, disc; |
| unsigned long flags; |
| enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action; |
| struct ccw_device *cdev; |
| |
| spin_lock_irqsave(sch->lock, flags); |
| cdev = sch_get_cdev(sch); |
| disc = device_is_disconnected(cdev); |
| if (disc && slow) { |
| /* Disconnected devices are evaluated directly only.*/ |
| spin_unlock_irqrestore(sch->lock, flags); |
| return 0; |
| } |
| /* No interrupt after machine check - kill pending timers. */ |
| if (cdev) |
| ccw_device_set_timeout(cdev, 0); |
| if (!disc && !slow) { |
| /* Non-disconnected devices are evaluated on the slow path. */ |
| spin_unlock_irqrestore(sch->lock, flags); |
| return -EAGAIN; |
| } |
| event = io_subchannel_get_status(sch); |
| CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", |
| sch->schid.ssid, sch->schid.sch_no, event, |
| disc ? "disconnected" : "normal", |
| slow ? "slow" : "fast"); |
| /* Analyze subchannel status. */ |
| action = NONE; |
| switch (event) { |
| case CIO_NO_PATH: |
| if (disc) { |
| /* Check if paths have become available. */ |
| action = REPROBE; |
| break; |
| } |
| /* fall through */ |
| case CIO_GONE: |
| /* Ask driver what to do with device. */ |
| if (io_subchannel_notify(sch, event)) |
| action = DISC; |
| else |
| action = UNREGISTER; |
| break; |
| case CIO_REVALIDATE: |
| /* Device will be removed, so no notify necessary. */ |
| if (disc) |
| /* Reprobe because immediate unregister might block. */ |
| action = REPROBE; |
| else |
| action = UNREGISTER_PROBE; |
| break; |
| case CIO_OPER: |
| if (disc) |
| /* Get device operational again. */ |
| action = REPROBE; |
| break; |
| } |
| /* Perform action. */ |
| ret = 0; |
| switch (action) { |
| case UNREGISTER: |
| case UNREGISTER_PROBE: |
| ccw_device_set_notoper(cdev); |
| /* Unregister device (will use subchannel lock). */ |
| spin_unlock_irqrestore(sch->lock, flags); |
| css_sch_device_unregister(sch); |
| spin_lock_irqsave(sch->lock, flags); |
| |
| /* Reset intparm to zeroes. */ |
| sch->schib.pmcw.intparm = 0; |
| cio_modify(sch); |
| break; |
| case REPROBE: |
| ccw_device_trigger_reprobe(cdev); |
| break; |
| case DISC: |
| device_set_disconnected(cdev); |
| break; |
| default: |
| break; |
| } |
| spin_unlock_irqrestore(sch->lock, flags); |
| /* Probe if necessary. */ |
| if (action == UNREGISTER_PROBE) |
| ret = css_probe_device(sch->schid); |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_CCW_CONSOLE |
| static struct ccw_device console_cdev; |
| static char console_cdev_name[10] = "0.x.xxxx"; |
| 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) |
| { |
| return &ccw_console_lock; |
| } |
| |
| static int ccw_device_console_enable(struct ccw_device *cdev, |
| struct subchannel *sch) |
| { |
| int rc; |
| |
| /* Attach subchannel private data. */ |
| sch->private = cio_get_console_priv(); |
| memset(sch->private, 0, sizeof(struct io_subchannel_private)); |
| io_subchannel_init_fields(sch); |
| sch->driver = &io_subchannel_driver; |
| /* Initialize the ccw_device structure. */ |
| cdev->dev.parent= &sch->dev; |
| rc = io_subchannel_recog(cdev, sch); |
| if (rc) |
| return rc; |
| |
| /* 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) |
| 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; |
| out_unlock: |
| spin_unlock_irq(cdev->ccwlock); |
| return 0; |
| } |
| |
| struct ccw_device * |
| ccw_device_probe_console(void) |
| { |
| 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; |
| } |
| 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; |
| ret = ccw_device_console_enable(&console_cdev, sch); |
| if (ret) { |
| cio_release_console(); |
| console_cdev_in_use = 0; |
| return ERR_PTR(ret); |
| } |
| console_cdev.online = 1; |
| return &console_cdev; |
| } |
| |
| |
| const char *cio_get_console_cdev_name(struct subchannel *sch) |
| { |
| snprintf(console_cdev_name, 10, "0.%x.%04x", |
| sch->schid.ssid, sch->schib.pmcw.dev); |
| return (const char *)console_cdev_name; |
| } |
| #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; |
| struct device_driver *drv; |
| |
| drv = get_driver(&cdrv->driver); |
| if (!drv) |
| return NULL; |
| |
| dev = driver_find_device(drv, NULL, (void *)bus_id, |
| __ccwdev_check_busid); |
| put_driver(drv); |
| |
| 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 */ |
| |
| ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; |
| |
| if (ret) { |
| cdev->drv = NULL; |
| 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); |
| if (cdev->online) { |
| cdev->online = 0; |
| spin_lock_irq(cdev->ccwlock); |
| 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); |
| } |
| ccw_device_set_timeout(cdev, 0); |
| cdev->drv = NULL; |
| return 0; |
| } |
| |
| static void ccw_device_shutdown(struct device *dev) |
| { |
| struct ccw_device *cdev; |
| |
| cdev = to_ccwdev(dev); |
| if (cdev->drv && cdev->drv->shutdown) |
| cdev->drv->shutdown(cdev); |
| disable_cmf(cdev); |
| } |
| |
| 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, |
| }; |
| |
| /** |
| * ccw_driver_register() - register a ccw driver |
| * @cdriver: driver to be registered |
| * |
| * This function is mainly a wrapper around driver_register(). |
| * Returns: |
| * %0 on success and a negative error value on failure. |
| */ |
| int ccw_driver_register(struct ccw_driver *cdriver) |
| { |
| struct device_driver *drv = &cdriver->driver; |
| |
| drv->bus = &ccw_bus_type; |
| drv->name = cdriver->name; |
| drv->owner = cdriver->owner; |
| |
| return driver_register(drv); |
| } |
| |
| /** |
| * 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); |
| } |
| |
| /* 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; |
| } |
| |
| MODULE_LICENSE("GPL"); |
| EXPORT_SYMBOL(ccw_device_set_online); |
| EXPORT_SYMBOL(ccw_device_set_offline); |
| EXPORT_SYMBOL(ccw_driver_register); |
| EXPORT_SYMBOL(ccw_driver_unregister); |
| EXPORT_SYMBOL(get_ccwdev_by_busid); |
| EXPORT_SYMBOL(ccw_bus_type); |
| EXPORT_SYMBOL(ccw_device_work); |
| EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |