diff options
Diffstat (limited to 'drivers/staging/unisys/visorbus/visorbus_main.c')
| -rw-r--r-- | drivers/staging/unisys/visorbus/visorbus_main.c | 1643 |
1 files changed, 1643 insertions, 0 deletions
diff --git a/drivers/staging/unisys/visorbus/visorbus_main.c b/drivers/staging/unisys/visorbus/visorbus_main.c new file mode 100644 index 0000000..d717e35 --- /dev/null +++ b/drivers/staging/unisys/visorbus/visorbus_main.c @@ -0,0 +1,1643 @@ +/* visorbus_main.c + * + * Copyright � 2010 - 2013 UNISYS CORPORATION + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + */ + +#include <linux/uuid.h> + +#include "visorbus_private.h" +#include "businst_attr.h" +#include "channel_attr.h" +#include "devmajorminor_attr.h" +#include "periodic_work.h" +#include "vbuschannel.h" +#include "guestlinuxdebug.h" +#include "vbusdeviceinfo.h" +/* These forward declarations are required since our drivers are out-of-tree. + * The structures referenced are kernel-private and are not in the headers, but + * it is impossible to make a functioning bus driver without them. + */ +struct subsys_private { + struct kset subsys; + struct kset *devices_kset; + + struct kset *drivers_kset; + struct klist klist_devices; + struct klist klist_drivers; + struct blocking_notifier_head bus_notifier; + unsigned int drivers_autoprobe:1; + struct bus_type *bus; + + struct list_head class_interfaces; + struct kset glue_dirs; + struct mutex class_mutex; /* ignore */ + struct class *class; +}; + +struct bus_type_private { + struct kset subsys; + struct kset *drivers_kset; + struct kset *devices_kset; + struct klist klist_devices; + struct klist klist_drivers; + struct blocking_notifier_head bus_notifier; + unsigned int drivers_autoprobe:1; + struct bus_type *bus; +}; + +#define CURRENT_FILE_PC VISOR_BUS_PC_visorbus_main_c +#define POLLJIFFIES_TESTWORK 100 +#define POLLJIFFIES_NORMALCHANNEL 10 + +static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env); +static int visorbus_match(struct device *xdev, struct device_driver *xdrv); +static void fix_vbus_dev_info(struct visor_device *visordev); + +/** This describes the TYPE of bus. + * (Don't confuse this with an INSTANCE of the bus.) + */ +static struct bus_type visorbus_type = { + .name = "visorbus", + .match = visorbus_match, + .uevent = visorbus_uevent, +}; + +static struct delayed_work periodic_work; + +/* YES, we need 2 workqueues. + * The reason is, workitems on the test queue may need to cancel + * workitems on the other queue. You will be in for trouble if you try to + * do this with workitems queued on the same workqueue. + */ +static struct workqueue_struct *periodic_test_workqueue; +static struct workqueue_struct *periodic_dev_workqueue; +static long long bus_count; /** number of bus instances */ +static long long total_devices_created; + /** ever-increasing */ + +static void chipset_bus_create(u32 bus_no); +static void chipset_bus_destroy(u32 bus_no); +static void chipset_device_create(u32 bus_no, u32 dev_no); +static void chipset_device_destroy(u32 bus_no, u32 dev_no); +static void chipset_device_pause(u32 bus_no, u32 dev_no); +static void chipset_device_resume(u32 bus_no, u32 dev_no); + +/** These functions are implemented herein, and are called by the chipset + * driver to notify us about specific events. + */ +static struct visorchipset_busdev_notifiers chipset_notifiers = { + .bus_create = chipset_bus_create, + .bus_destroy = chipset_bus_destroy, + .device_create = chipset_device_create, + .device_destroy = chipset_device_destroy, + .device_pause = chipset_device_pause, + .device_resume = chipset_device_resume, +}; + +/** These functions are implemented in the chipset driver, and we call them + * herein when we want to acknowledge a specific event. + */ +static struct visorchipset_busdev_responders chipset_responders; + +/* filled in with info about parent chipset driver when we register with it */ +static struct ultra_vbus_deviceinfo chipset_driverinfo; +/* filled in with info about this driver, wrt it servicing client busses */ +static struct ultra_vbus_deviceinfo clientbus_driverinfo; + +/** list of visorbus_devdata structs, linked via .list_all */ +static LIST_HEAD(list_all_bus_instances); +/** list of visor_device structs, linked via .list_all */ +static LIST_HEAD(list_all_device_instances); + +static int +visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env) +{ + if (add_uevent_var(env, "VERSION=%s", VERSION)) + return -ENOMEM; + return 0; +} + +/* This is called automatically upon adding a visor_device (device_add), or + * adding a visor_driver (visorbus_register_visor_driver), and returns 1 iff the + * provided driver can control the specified device. + */ +static int +visorbus_match(struct device *xdev, struct device_driver *xdrv) +{ + uuid_le channel_type; + int rc = 0; + int i; + struct visor_device *dev; + struct visor_driver *drv; + + dev = to_visor_device(xdev); + drv = to_visor_driver(xdrv); + channel_type = visorchannel_get_uuid(dev->visorchannel); + if (visorbus_forcematch) { + rc = 1; + goto away; + } + if (visorbus_forcenomatch) + goto away; + + if (!drv->channel_types) + goto away; + for (i = 0; + (uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) || + (drv->channel_types[i].name); + i++) + if (uuid_le_cmp(drv->channel_types[i].guid, + channel_type) == 0) { + rc = i + 1; + goto away; + } +away: + return rc; +} + +/** This is called when device_unregister() is called for the bus device + * instance, after all other tasks involved with destroying the device + * are complete. + */ +static void +visorbus_release_busdevice(struct device *xdev) +{ + struct visorbus_devdata *devdata = dev_get_drvdata(xdev); + + dev_set_drvdata(xdev, NULL); + kfree(devdata); + kfree(xdev); +} + +/** This is called when device_unregister() is called for each child + * device instance. + */ +static void +visorbus_release_device(struct device *xdev) +{ + struct visor_device *dev = to_visor_device(xdev); + + if (dev->periodic_work) { + visor_periodic_work_destroy(dev->periodic_work); + dev->periodic_work = NULL; + } + if (dev->visorchannel) { + visorchannel_destroy(dev->visorchannel); + dev->visorchannel = NULL; + } + kfree(dev); +} + +static const struct sysfs_ops businst_sysfs_ops = { + .show = businst_attr_show, + .store = businst_attr_store, +}; + +static struct kobj_type businst_kobj_type = { + .sysfs_ops = &businst_sysfs_ops +}; + +static struct kset businstances = { /* should actually be a member of + * bus_type */ +}; + +/* BUS type attributes + * + * define & implement display of bus attributes under + * /sys/bus/visorbus. + * + */ + +static ssize_t +BUSTYPE_ATTR_version(struct bus_type *bus, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%s\n", VERSION); +} + +static struct bus_attribute bustype_attr_version = +__ATTR(version, S_IRUGO, BUSTYPE_ATTR_version, NULL); + +static int +register_bustype_attributes(void) +{ + int rc = 0; + + rc = bus_create_file(&visorbus_type, &bustype_attr_version); + if (rc < 0) + goto away; + + /* Here we make up for the fact that bus_type does not yet have a + * member to keep track of multiple bus instances for a given bus + * type. This is useful for stashing properties for each bus + * instance. + */ + kobject_set_name(&businstances.kobj, "busses"); + businstances.kobj.ktype = &businst_kobj_type; + businstances.kobj.parent = &visorbus_type.p->subsys.kobj; + rc = kset_register(&businstances); + if (rc < 0) + goto away; + + rc = 0; +away: + return rc; +} + +static void +unregister_bustype_attributes(void) +{ + bus_remove_file(&visorbus_type, &bustype_attr_version); + kset_unregister(&businstances); +} + +/* BUS instance attributes + * + * define & implement display of bus attributes under + * /sys/bus/visorbus/busses/visorbus<n>. + * + * This is a bit hoaky because the kernel does not yet have the infrastructure + * to separate bus INSTANCE attributes from bus TYPE attributes... + * so we roll our own. See businst.c / businst.h. + * + */ + +static ssize_t businst_attr_partition_handle(struct visorbus_devdata *businst, + char *buf) { + struct visorchipset_bus_info bus_info; + int len = 0; + + if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) + len = snprintf(buf, PAGE_SIZE, + "0x%Lx\n", + (unsigned long long)bus_info.partition_handle); + return len; +} + +static ssize_t businst_attr_partition_guid(struct visorbus_devdata *businst, + char *buf) { + struct visorchipset_bus_info bus_info; + int len = 0; + + if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) + len = snprintf(buf, PAGE_SIZE, "{%pUb}\n", + &bus_info.partition_uuid); + return len; +} + +static ssize_t businst_attr_partition_name(struct visorbus_devdata *businst, + char *buf) { + struct visorchipset_bus_info bus_info; + int len = 0; + + if (businst && + visorchipset_get_bus_info(businst->devno, &bus_info) && + bus_info.name) + len = snprintf(buf, PAGE_SIZE, "%s\n", bus_info.name); + return len; +} + +static ssize_t businst_attr_channel_addr(struct visorbus_devdata *businst, + char *buf) { + struct visorchipset_bus_info bus_info; + int len = 0; + + if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) + len = snprintf(buf, PAGE_SIZE, "0x%Lx\n", (unsigned long long) + bus_info.chan_info.channel_addr); + return len; +} + +static ssize_t businst_attr_nchannel_bytes(struct visorbus_devdata *businst, + char *buf) { + struct visorchipset_bus_info bus_info; + int len = 0; + + if (businst && visorchipset_get_bus_info(businst->devno, &bus_info)) + len = snprintf(buf, PAGE_SIZE, "0x%Lx\n", (unsigned long long) + bus_info.chan_info.n_channel_bytes); + return len; +} + +static ssize_t businst_attr_channel_id(struct visorbus_devdata *businst, + char *buf) { + int len = 0; + + if (businst && businst->chan) { + visorchannel_id(businst->chan, buf); + len = strlen(buf); + buf[len++] = '\n'; + } + return len; +} + +static ssize_t businst_attr_client_bus_info(struct visorbus_devdata *businst, + char *buf) { + struct visorchipset_bus_info bus_info; + int i, x, remain = PAGE_SIZE; + unsigned long off; + char *p = buf; + u8 *partition_name; + struct ultra_vbus_deviceinfo dev_info; + + partition_name = ""; + if (businst && businst->chan) { + if (visorchipset_get_bus_info(businst->devno, &bus_info) && + bus_info.name) + partition_name = bus_info.name; + x = snprintf(p, remain, + "Client device / client driver info for %s partition (vbus #%d):\n", + partition_name, businst->devno); + p += x; + remain -= x; + x = visorchannel_read(businst->chan, + offsetof(struct + spar_vbus_channel_protocol, + chp_info), + &dev_info, sizeof(dev_info)); + if (x >= 0) { + x = vbuschannel_devinfo_to_string(&dev_info, p, + remain, -1); + p += x; + remain -= x; + } + x = visorchannel_read(businst->chan, + offsetof(struct + spar_vbus_channel_protocol, + bus_info), + &dev_info, sizeof(dev_info)); + if (x >= 0) { + x = vbuschannel_devinfo_to_string(&dev_info, p, + remain, -1); + p += x; + remain -= x; + } + off = offsetof(struct spar_vbus_channel_protocol, dev_info); + i = 0; + while (off + sizeof(dev_info) <= + visorchannel_get_nbytes(businst->chan)) { + x = visorchannel_read(businst->chan, + off, &dev_info, sizeof(dev_info)); + if (x >= 0) { + x = vbuschannel_devinfo_to_string + (&dev_info, p, remain, i); + p += x; + remain -= x; + } + off += sizeof(dev_info); + i++; + } + } + return PAGE_SIZE - remain; +} + +static struct businst_attribute ba_partition_handle = + __ATTR(partition_handle, S_IRUGO, businst_attr_partition_handle, NULL); +static struct businst_attribute ba_partition_guid = + __ATTR(partition_guid, S_IRUGO, businst_attr_partition_guid, NULL); +static struct businst_attribute ba_partition_name = + __ATTR(partition_name, S_IRUGO, businst_attr_partition_name, NULL); +static struct businst_attribute ba_channel_addr = + __ATTR(channel_addr, S_IRUGO, businst_attr_channel_addr, NULL); +static struct businst_attribute ba_nchannel_bytes = + __ATTR(nchannel_bytes, S_IRUGO, businst_attr_nchannel_bytes, NULL); +static struct businst_attribute ba_channel_id = + __ATTR(channel_id, S_IRUGO, businst_attr_channel_id, NULL); +static struct businst_attribute ba_client_bus_info = + __ATTR(client_bus_info, S_IRUGO, businst_attr_client_bus_info, NULL); + +static int +register_businst_attributes(struct visorbus_devdata *businst) +{ + int rc = 0; + + businst->kobj.kset = &businstances; /* identify parent sysfs dir */ + rc = kobject_init_and_add(&businst->kobj, &businst_kobj_type, + NULL, "visorbus%d", businst->devno); + if (rc < 0) + goto away; + + rc = businst_create_file(businst, &ba_partition_handle); + if (rc < 0) + goto away; + + rc = businst_create_file(businst, &ba_partition_guid); + if (rc < 0) + goto away; + + rc = businst_create_file(businst, &ba_partition_name); + if (rc < 0) + goto away; + + rc = businst_create_file(businst, &ba_channel_addr); + if (rc < 0) + goto away; + + rc = businst_create_file(businst, &ba_nchannel_bytes); + if (rc < 0) + goto away; + + rc = businst_create_file(businst, &ba_channel_id); + if (rc < 0) + goto away; + + rc = businst_create_file(businst, &ba_client_bus_info); + if (rc < 0) + goto away; + + kobject_uevent(&businst->kobj, KOBJ_ADD); + + rc = 0; +away: + return rc; +} + +static void +unregister_businst_attributes(struct visorbus_devdata *businst) +{ + businst_remove_file(businst, &ba_partition_handle); + businst_remove_file(businst, &ba_partition_guid); + businst_remove_file(businst, &ba_partition_name); + businst_remove_file(businst, &ba_channel_addr); + businst_remove_file(businst, &ba_nchannel_bytes); + businst_remove_file(businst, &ba_channel_id); + businst_remove_file(businst, &ba_client_bus_info); + kobject_put(&businst->kobj); +} + +/* DRIVER attributes + * + * define & implement display of driver attributes under + * /sys/bus/visorbus/drivers/<drivername>. + * + */ + +static ssize_t +DRIVER_ATTR_version(struct device_driver *xdrv, char *buf) +{ + struct visor_driver *drv = to_visor_driver(xdrv); + + return snprintf(buf, PAGE_SIZE, "%s\n", drv->version); +} + +static int +register_driver_attributes(struct visor_driver *drv) +{ + int rc; + struct driver_attribute version = + __ATTR(version, S_IRUGO, DRIVER_ATTR_version, NULL); + drv->version_attr = version; + rc = driver_create_file(&drv->driver, &drv->version_attr); + return rc; +} + +static void +unregister_driver_attributes(struct visor_driver *drv) +{ + driver_remove_file(&drv->driver, &drv->version_attr); +} + +/* DEVICE attributes + * + * define & implement display of device attributes under + * /sys/bus/visorbus/devices/<devicename>. + * + */ + +#define DEVATTR(nam, func) { \ + .attr = { .name = __stringify(nam), \ + .mode = 0444, \ + .owner = THIS_MODULE }, \ + .show = func, \ +} + +static struct device_attribute visor_device_attrs[] = { + /* DEVATTR(channel_nbytes, DEVICE_ATTR_channel_nbytes), */ + __ATTR_NULL +}; + +static void +dev_periodic_work(void *xdev) +{ + struct visor_device *dev = (struct visor_device *)xdev; + struct visor_driver *drv = to_visor_driver(dev->device.driver); + + down(&dev->visordriver_callback_lock); + if (drv->channel_interrupt) + drv->channel_interrupt(dev); + up(&dev->visordriver_callback_lock); + if (!visor_periodic_work_nextperiod(dev->periodic_work)) + put_device(&dev->device); +} + +static void +dev_start_periodic_work(struct visor_device *dev) +{ + if (dev->being_removed) + return; + /* now up by at least 2 */ + get_device(&dev->device); + if (!visor_periodic_work_start(dev->periodic_work)) + put_device(&dev->device); +} + +static void +dev_stop_periodic_work(struct visor_device *dev) +{ + if (visor_periodic_work_stop(dev->periodic_work)) + put_device(&dev->device); +} + +/** This is called automatically upon adding a visor_device (device_add), or + * adding a visor_driver (visorbus_register_visor_driver), but only after + * visorbus_match has returned 1 to indicate a successful match between + * driver and device. + */ +static int +visordriver_probe_device(struct device *xdev) +{ + int rc; + struct visor_driver *drv; + struct visor_device *dev; + + drv = to_visor_driver(xdev->driver); + dev = to_visor_device(xdev); + down(&dev->visordriver_callback_lock); + dev->being_removed = FALSE; + /* + * ensure that the dev->being_removed flag is cleared before + * we start the probe + */ + wmb(); + get_device(&dev->device); + if (!drv->probe) { + up(&dev->visordriver_callback_lock); + rc = -1; + goto away; + } + rc = drv->probe(dev); + if (rc < 0) + goto away; + + fix_vbus_dev_info(dev); + up(&dev->visordriver_callback_lock); + rc = 0; +away: + if (rc != 0) + put_device(&dev->device); + /* We could get here more than once if the child driver module is + * unloaded and re-loaded while devices are present. That's why we + * need a flag to be sure that we only respond to the device_create + * once. We cannot respond to the device_create prior to here, + * because until we call drv->probe() above, the channel has not been + * initialized. + */ + if (!dev->responded_to_device_create) { + dev->responded_to_device_create = TRUE; + if (chipset_responders.device_create) + (*chipset_responders.device_create)(dev->chipset_bus_no, + dev->chipset_dev_no, + rc); + } + return rc; +} + +/** This is called when device_unregister() is called for each child device + * instance, to notify the appropriate visorbus_driver that the device is + * going away, and to decrease the reference count of the device. + */ +static int +visordriver_remove_device(struct device *xdev) +{ + int rc = 0; + struct visor_device *dev; + struct visor_driver *drv; + + dev = to_visor_device(xdev); + drv = to_visor_driver(xdev->driver); + down(&dev->visordriver_callback_lock); + dev->being_removed = TRUE; + /* + * ensure that the dev->being_removed flag is set before we start the + * actual removal + */ + wmb(); + if (drv) { + if (drv->remove) + drv->remove(dev); + } + up(&dev->visordriver_callback_lock); + dev_stop_periodic_work(dev); + devmajorminor_remove_all_files(dev); + + put_device(&dev->device); + + return rc; +} + +/** A particular type of visor driver calls this function to register + * the driver. The caller MUST fill in the following fields within the + * #drv structure: + * name, version, owner, channel_types, probe, remove + * + * Here's how the whole Linux bus / driver / device model works. + * + * At system start-up, the visorbus kernel module is loaded, which registers + * visorbus_type as a bus type, using bus_register(). + * + * All kernel modules that support particular device types on a + * visorbus bus are loaded. Each of these kernel modules calls + * visorbus_register_visor_driver() in their init functions, passing a + * visor_driver struct. visorbus_register_visor_driver() in turn calls + * register_driver(&visor_driver.driver). This .driver member is + * initialized with generic methods (like probe), whose sole responsibility + * is to act as a broker for the real methods, which are within the + * visor_driver struct. (This is the way the subclass behavior is + * implemented, since visor_driver is essentially a subclass of the + * generic driver.) Whenever a driver_register() happens, core bus code in + * the kernel does (see device_attach() in drivers/base/dd.c): + * + * for each dev associated with the bus (the bus that driver is on) that + * does not yet have a driver + * if bus.match(dev,newdriver) == yes_matched ** .match specified + * ** during bus_register(). + * newdriver.probe(dev) ** for visor drivers, this will call + * ** the generic driver.probe implemented in visorbus.c, + * ** which in turn calls the probe specified within the + * ** struct visor_driver (which was specified by the + * ** actual device driver as part of + * ** visorbus_register_visor_driver()). + * + * The above dance also happens when a new device appears. + * So the question is, how are devices created within the system? + * Basically, just call device_add(dev). See pci_bus_add_devices(). + * pci_scan_device() shows an example of how to build a device struct. It + * returns the newly-created struct to pci_scan_single_device(), who adds it + * to the list of devices at PCIBUS.devices. That list of devices is what + * is traversed by pci_bus_add_devices(). + * + */ +int visorbus_register_visor_driver(struct visor_driver *drv) +{ + int rc = 0; + + drv->driver.name = drv->name; + drv->driver.bus = &visorbus_type; + drv->driver.probe = visordriver_probe_device; + drv->driver.remove = visordriver_remove_device; + drv->driver.owner = drv->owner; + + /* driver_register does this: + * bus_add_driver(drv) + * ->if (drv.bus) ** (bus_type) ** + * driver_attach(drv) + * for each dev with bus type of drv.bus + * if (!dev.drv) ** no driver assigned yet ** + * if (bus.match(dev,drv)) [visorbus_match] + * dev.drv = drv + * if (!drv.probe(dev)) [visordriver_probe_device] + * dev.drv = NULL + */ + + rc = driver_register(&drv->driver); + if (rc < 0) + return rc; + rc = register_driver_attributes(drv); + return rc; +} +EXPORT_SYMBOL_GPL(visorbus_register_visor_driver); + +/** A particular type of visor driver calls this function to unregister + * the driver, i.e., within its module_exit function. + */ +void +visorbus_unregister_visor_driver(struct visor_driver *drv) +{ + unregister_driver_attributes(drv); + driver_unregister(&drv->driver); +} +EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver); + +int +visorbus_read_channel(struct visor_device *dev, unsigned long offset, + void *dest, unsigned long nbytes) +{ + return visorchannel_read(dev->visorchannel, offset, dest, nbytes); +} +EXPORT_SYMBOL_GPL(visorbus_read_channel); + +int +visorbus_write_channel(struct visor_device *dev, unsigned long offset, + void *src, unsigned long nbytes) +{ + return visorchannel_write(dev->visorchannel, offset, src, nbytes); +} +EXPORT_SYMBOL_GPL(visorbus_write_channel); + +int +visorbus_clear_channel(struct visor_device *dev, unsigned long offset, u8 ch, + unsigned long nbytes) +{ + return visorchannel_clear(dev->visorchannel, offset, ch, nbytes); +} +EXPORT_SYMBOL_GPL(visorbus_clear_channel); + +int +visorbus_registerdevnode(struct visor_device *dev, + const char *name, int major, int minor) +{ + return devmajorminor_create_file(dev, name, major, minor); +} +EXPORT_SYMBOL_GPL(visorbus_registerdevnode); + +/** We don't really have a real interrupt, so for now we just call the + * interrupt function periodically... + */ +void +visorbus_enable_channel_interrupts(struct visor_device *dev) +{ + dev_start_periodic_work(dev); +} +EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts); + +void +visorbus_disable_channel_interrupts(struct visor_device *dev) +{ + dev_stop_periodic_work(dev); +} +EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts); + +/** This is how everything starts from the device end. + * This function is called when a channel first appears via a ControlVM + * message. In response, this function allocates a visor_device to + * correspond to the new channel, and attempts to connect it the appropriate + * driver. If the appropriate driver is found, the visor_driver.probe() + * function for that driver will be called, and will be passed the new + * visor_device that we just created. + * + * It's ok if the appropriate driver is not yet loaded, because in that case + * the new device struct will just stick around in the bus' list of devices. + * When the appropriate driver calls visorbus_register_visor_driver(), the + * visor_driver.probe() for the new driver will be called with the new + * device. + */ +static int +create_visor_device(struct visorbus_devdata *devdata, + unsigned long chipset_bus_no, unsigned long chipset_dev_no, + struct visorchipset_channel_info chan_info, + u64 partition_handle) +{ + int rc = -1; + struct visorchannel *visorchannel = NULL; + struct visor_device *dev = NULL; + bool gotten = FALSE, registered1 = FALSE, registered2 = FALSE; + + POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no, + POSTCODE_SEVERITY_INFO); + /* prepare chan_hdr (abstraction to read/write channel memory) */ + visorchannel = visorchannel_create(chan_info.channel_addr, + (unsigned long) + chan_info.n_channel_bytes, + chan_info.channel_type_uuid); + if (!visorchannel) { + POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, + DIAG_SEVERITY_ERR); + goto away; + } + dev = kmalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) { + POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, + DIAG_SEVERITY_ERR); + goto away; + } + + memset(dev, 0, sizeof(struct visor_device)); + dev->visorchannel = visorchannel; + dev->channel_type_guid = chan_info.channel_type_uuid; + dev->channel_bytes = chan_info.n_channel_bytes; + dev->chipset_bus_no = chipset_bus_no; + dev->chipset_dev_no = chipset_dev_no; + dev->device.parent = devdata->dev; + sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */ + dev->device.bus = &visorbus_type; + device_initialize(&dev->device); + dev->device.release = visorbus_release_device; + /* keep a reference just for us (now 2) */ + get_device(&dev->device); + gotten = TRUE; + dev->periodic_work = + visor_periodic_work_create(POLLJIFFIES_NORMALCHANNEL, + periodic_dev_workqueue, + dev_periodic_work, + dev, dev_name(&dev->device)); + if (!dev->periodic_work) { + POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no, + DIAG_SEVERITY_ERR); + goto away; + } + + /* bus_id must be a unique name with respect to this bus TYPE + * (NOT bus instance). That's why we need to include the bus + * number within the name. + */ + dev_set_name(&dev->device, "vbus%lu:dev%lu", + chipset_bus_no, chipset_dev_no); + + /* device_add does this: + * bus_add_device(dev) + * ->device_attach(dev) + * ->for each driver drv registered on the bus that dev is on + * if (dev.drv) ** device already has a driver ** + * ** not sure we could ever get here... ** + * else + * if (bus.match(dev,drv)) [visorbus_match] + * dev.drv = drv + * if (!drv.probe(dev)) [visordriver_probe_device] + * dev.drv = NULL + * + * Note that device_add does NOT fail if no driver failed to + * claim the device. The device will be linked onto + * bus_type.klist_devices regardless (use bus_for_each_dev). + */ + rc = device_add(&dev->device); + if (rc < 0) { + POSTCODE_LINUX_3(DEVICE_ADD_PC, chipset_bus_no, + DIAG_SEVERITY_ERR); + goto away; + } + + /* note: device_register is simply device_initialize + device_add */ + rc = register_channel_attributes(dev); + if (rc < 0) { + POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no, + DIAG_SEVERITY_ERR); + goto away; + } + + registered1 = TRUE; + + rc = register_devmajorminor_attributes(dev); + if (rc < 0) { + POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no, + DIAG_SEVERITY_ERR); + goto away; + } + + registered2 = TRUE; + rc = 0; + +away: + if (rc < 0) { + if (registered2) + unregister_devmajorminor_attributes(dev); + if (registered1) + unregister_channel_attributes(dev); + if (gotten) + put_device(&dev->device); + if (visorchannel) + visorchannel_destroy(visorchannel); + kfree(dev); + } else { + total_devices_created++; + list_add_tail(&dev->list_all, &list_all_device_instances); + } + return rc; +} + +static void +remove_visor_device(struct visor_device *dev) +{ + list_del(&dev->list_all); + unregister_devmajorminor_attributes(dev); + unregister_channel_attributes(dev); + put_device(&dev->device); + device_unregister(&dev->device); +} + +static struct visor_device * +find_visor_device_by_channel(HOSTADDRESS channel_physaddr) +{ + struct list_head *listentry, *listtmp; + + list_for_each_safe(listentry, listtmp, &list_all_device_instances) { + struct visor_device *dev = list_entry(listentry, + struct visor_device, + list_all); + if (visorchannel_get_physaddr(dev->visorchannel) == + channel_physaddr) + return dev; + } + return NULL; +} + +static int +init_vbus_channel(struct visorchannel *chan) +{ + int rc = -1; + unsigned long allocated_bytes = visorchannel_get_nbytes(chan); + struct spar_vbus_channel_protocol *x = + kmalloc(sizeof(struct spar_vbus_channel_protocol), + GFP_KERNEL); + + POSTCODE_LINUX_3(VBUS_CHANNEL_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); + + if (x) { + POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); + goto away; + } + if (visorchannel_clear(chan, 0, 0, allocated_bytes) < 0) { + POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, + POSTCODE_SEVERITY_ERR); + goto away; + } + if (visorchannel_read + (chan, 0, x, sizeof(struct spar_vbus_channel_protocol)) < 0) { + POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, + POSTCODE_SEVERITY_ERR); + goto away; + } + if (!SPAR_VBUS_CHANNEL_OK_SERVER(allocated_bytes)) { + POSTCODE_LINUX_2(VBUS_CHANNEL_FAILURE_PC, + POSTCODE_SEVERITY_ERR); + goto away; + } + + if (visorchannel_write + (chan, 0, x, sizeof(struct spar_vbus_channel_protocol)) < 0) { + POSTCODE_LINUX_3(VBUS_CHANNEL_FAILURE_PC, chan, + POSTCODE_SEVERITY_ERR); + goto away; + } + + POSTCODE_LINUX_3(VBUS_CHANNEL_EXIT_PC, chan, POSTCODE_SEVERITY_INFO); + rc = 0; + +away: + kfree(x); + x = NULL; + return rc; +} + +static int +get_vbus_header_info(struct visorchannel *chan, + struct spar_vbus_headerinfo *hdr_info) +{ + int rc = -1; + + if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan))) + goto away; + if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info, + sizeof(*hdr_info)) < 0) { + goto away; + } + if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo)) + goto away; + if (hdr_info->device_info_struct_bytes < + sizeof(struct ultra_vbus_deviceinfo)) { + goto away; + } + rc = 0; +away: + return rc; +} + +/* Write the contents of <info> to the struct + * spar_vbus_channel_protocol.chp_info. */ + +static int +write_vbus_chp_info(struct visorchannel *chan, + struct spar_vbus_headerinfo *hdr_info, + struct ultra_vbus_deviceinfo *info) +{ + int off = sizeof(struct channel_header) + hdr_info->chp_info_offset; + + if (hdr_info->chp_info_offset == 0) + return -1; + + if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) + return -1; + return 0; +} + +/* Write the contents of <info> to the struct + * spar_vbus_channel_protocol.bus_info. */ + +static int +write_vbus_bus_info(struct visorchannel *chan, + struct spar_vbus_headerinfo *hdr_info, + struct ultra_vbus_deviceinfo *info) +{ + int off = sizeof(struct channel_header) + hdr_info->bus_info_offset; + + if (hdr_info->bus_info_offset == 0) + return -1; + + if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) + return -1; + return 0; +} + +/* Write the contents of <info> to the + * struct spar_vbus_channel_protocol.dev_info[<devix>]. + */ +static int +write_vbus_dev_info(struct visorchannel *chan, + struct spar_vbus_headerinfo *hdr_info, + struct ultra_vbus_deviceinfo *info, int devix) +{ + int off = + (sizeof(struct channel_header) + hdr_info->dev_info_offset) + + (hdr_info->device_info_struct_bytes * devix); + + if (hdr_info->dev_info_offset == 0) + return -1; + + if (visorchannel_write(chan, off, info, sizeof(*info)) < 0) + return -1; + return 0; +} + +/* For a child device just created on a client bus, fill in + * information about the driver that is controlling this device into + * the the appropriate slot within the vbus channel of the bus + * instance. + */ +static void +fix_vbus_dev_info(struct visor_device *visordev) +{ + int i; + struct visorchipset_bus_info bus_info; + struct visorbus_devdata *devdata = NULL; + struct visor_driver *visordrv; + int bus_no = visordev->chipset_bus_no; + int dev_no = visordev->chipset_dev_no; + struct ultra_vbus_deviceinfo dev_info; + const char *chan_type_name = NULL; + + if (!visordev->device.driver) + return; + + visordrv = to_visor_driver(visordev->device.driver); + if (!visorchipset_get_bus_info(bus_no, &bus_info)) + return; + + devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); + if (!devdata) + return; + + if (!devdata->vbus_valid) + return; + + /* Within the list of device types (by GUID) that the driver + * says it supports, find out which one of those types matches + * the type of this device, so that we can include the device + * type name + */ + for (i = 0; visordrv->channel_types[i].name; i++) { + if (STRUCTSEQUAL(visordrv->channel_types[i].guid, + visordev->channel_type_guid)) { + chan_type_name = visordrv->channel_types[i].name; + break; + } + } + + bus_device_info_init(&dev_info, chan_type_name, + visordrv->name, visordrv->version, + visordrv->vertag); + write_vbus_dev_info(devdata->chan, + &devdata->vbus_hdr_info, &dev_info, dev_no); + + /* Re-write bus+chipset info, because it is possible that this + * was previously written by our evil counterpart, virtpci. + */ + write_vbus_chp_info(devdata->chan, &devdata->vbus_hdr_info, + &chipset_driverinfo); + write_vbus_bus_info(devdata->chan, &devdata->vbus_hdr_info, + &clientbus_driverinfo); +} + +/** Create a device instance for the visor bus itself. + */ +static struct visorbus_devdata * +create_bus_instance(int id) +{ + struct visorbus_devdata *rc = NULL; + struct visorbus_devdata *devdata = NULL; + struct device *dev; + struct visorchipset_bus_info bus_info; + + POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO); + dev = kmalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) { + POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); + rc = NULL; + goto away; + } + memset(dev, 0, sizeof(struct device)); + dev_set_name(dev, "visorbus%d", id); + dev->release = visorbus_release_busdevice; + if (device_register(dev) < 0) { + POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id, + POSTCODE_SEVERITY_ERR); + rc = NULL; + goto away; + } + devdata = kmalloc(sizeof(*devdata), GFP_KERNEL); + if (!devdata) { + POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR); + rc = NULL; + goto away; + } + memset(devdata, 0, sizeof(struct visorbus_devdata)); + devdata->devno = id; + devdata->dev = dev; + if ((visorchipset_get_bus_info(id, &bus_info)) && + (bus_info.chan_info.channel_addr > 0) && + (bus_info.chan_info.n_channel_bytes > 0)) { + HOSTADDRESS channel_addr = bus_info.chan_info.channel_addr; + unsigned long n_channel_bytes = + (unsigned long) + bus_info.chan_info.n_channel_bytes; + uuid_le channel_type_guid = + bus_info.chan_info.channel_type_uuid; + + devdata->chan = visorchannel_create(channel_addr, + n_channel_bytes, + channel_type_guid); + if (!devdata->chan) { + POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, channel_addr, + POSTCODE_SEVERITY_ERR); + } else { + if (bus_info.flags.server) { + init_vbus_channel(devdata->chan); + } else { + if (get_vbus_header_info(devdata->chan, + &devdata-> + vbus_hdr_info) >= 0) { + devdata->vbus_valid = TRUE; + write_vbus_chp_info(devdata->chan, + &devdata-> + vbus_hdr_info, + &chipset_driverinfo + ); + write_vbus_bus_info(devdata->chan, + &devdata-> + vbus_hdr_info, + &clientbus_driverinfo); + } + } + } + } + register_businst_attributes(devdata); + bus_count++; + list_add_tail(&devdata->list_all, &list_all_bus_instances); + if (id == 0) + devdata = devdata; /* for testing ONLY */ + dev_set_drvdata(dev, devdata); + rc = devdata; +away: + return rc; +} + +/** Remove a device instance for the visor bus itself. + */ +static void +remove_bus_instance(struct visorbus_devdata *devdata) +{ + /* Note that this will result in the release method for + * devdata->dev being called, which will call + * visorbus_release_busdevice(). This has something to do with + * the put_device() done in device_unregister(), but I have never + * successfully been able to trace thru the code to see where/how + * release() gets called. But I know it does. + */ + unregister_businst_attributes(devdata); + bus_count--; + if (devdata->chan) { + visorchannel_destroy(devdata->chan); + devdata->chan = NULL; + } + list_del(&devdata->list_all); + device_unregister(devdata->dev); +} + +/** Create and register the one-and-only one instance of + * the visor bus type (visorbus_type). + */ +static int +create_bus_type(void) +{ + int rc = 0; + + visorbus_type.dev_attrs = visor_device_attrs; + rc = bus_register(&visorbus_type); + if (rc < 0) + return rc; + + rc = register_bustype_attributes(); + return rc; +} + +/** Remove the one-and-only one instance of the visor bus type (visorbus_type). + */ +static void +remove_bus_type(void) +{ + unregister_bustype_attributes(); + bus_unregister(&visorbus_type); +} + +/** Remove all child visor bus device instances. + */ +static void +remove_all_visor_devices(void) +{ + struct list_head *listentry, *listtmp; + + list_for_each_safe(listentry, listtmp, &list_all_device_instances) { + struct visor_device *dev = list_entry(listentry, + struct visor_device, + list_all); + remove_visor_device(dev); + } +} + +static bool entered_testing_mode = FALSE; +static struct visorchipset_channel_info test_channel_infos[MAXDEVICETEST]; +static unsigned long test_bus_nos[MAXDEVICETEST]; +static unsigned long test_dev_nos[MAXDEVICETEST]; + +static void +chipset_bus_create(u32 bus_no) +{ + struct visorchipset_bus_info bus_info; + struct visorbus_devdata *devdata; + int rc = -1; + + POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO); + if (!visorchipset_get_bus_info(bus_no, &bus_info)) + goto away; + devdata = create_bus_instance(bus_no); + if (!devdata) + goto away; + if (!visorchipset_set_bus_context(bus_no, devdata)) + goto away; + POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO); + rc = 0; +away: + if (rc < 0) { + POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no, + POSTCODE_SEVERITY_ERR); + return; + } + POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no, + POSTCODE_SEVERITY_INFO); + if (chipset_responders.bus_create) + (*chipset_responders.bus_create) (bus_no, rc); +} + +static void +chipset_bus_destroy(u32 bus_no) +{ + struct visorchipset_bus_info bus_info; + struct visorbus_devdata *devdata; + int rc = -1; + + if (!visorchipset_get_bus_info(bus_no, &bus_info)) + goto away; + devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); + if (!devdata) + goto away; + remove_bus_instance(devdata); + if (!visorchipset_set_bus_context(bus_no, NULL)) + goto away; + rc = 0; +away: + if (rc < 0) + return; + if (chipset_responders.bus_destroy) + (*chipset_responders.bus_destroy)(bus_no, rc); +} + +static void +chipset_device_create(u32 bus_no, u32 dev_no) +{ + struct visorchipset_device_info dev_info; + struct visorchipset_bus_info bus_info; + struct visorbus_devdata *devdata = NULL; + int rc = -1; + + POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no, + POSTCODE_SEVERITY_INFO); + + if (entered_testing_mode) + return; + if (!visorchipset_get_device_info(bus_no, dev_no, &dev_info)) + goto away; + if (!visorchipset_get_bus_info(bus_no, &bus_info)) + goto away; + if (visorbus_devicetest) + if (total_devices_created < MAXDEVICETEST) { + test_channel_infos[total_devices_created] = + dev_info.chan_info; + test_bus_nos[total_devices_created] = bus_no; + test_dev_nos[total_devices_created] = dev_no; + } + POSTCODE_LINUX_4(DEVICE_CREATE_EXIT_PC, dev_no, bus_no, + POSTCODE_SEVERITY_INFO); + rc = 0; +away: + if (rc < 0) { + POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no, + POSTCODE_SEVERITY_ERR); + return; + } + devdata = (struct visorbus_devdata *)(bus_info.bus_driver_context); + rc = create_visor_device(devdata, bus_no, dev_no, + dev_info.chan_info, bus_info.partition_handle); + POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no, + POSTCODE_SEVERITY_INFO); + if (rc < 0) + if (chipset_responders.device_create) + (*chipset_responders.device_create)(bus_no, dev_no, rc); +} + +static void +chipset_device_destroy(u32 bus_no, u32 dev_no) +{ + struct visorchipset_device_info dev_info; + struct visor_device *dev; + int rc = -1; + + if (entered_testing_mode) + return; + if (!visorchipset_get_device_info(bus_no, dev_no, &dev_info)) + goto away; + dev = find_visor_device_by_channel(dev_info.chan_info.channel_addr); + if (!dev) + goto away; + rc = 0; +away: + if (rc < 0) + return; + + if (chipset_responders.device_destroy) + (*chipset_responders.device_destroy) (bus_no, dev_no, rc); + remove_visor_device(dev); +} + +/* This is the callback function specified for a function driver, to + * be called when a pending "pause device" operation has been + * completed. + */ +static void +pause_state_change_complete(struct visor_device *dev, int status) +{ + if (!dev->pausing) + return; + + dev->pausing = FALSE; + if (!chipset_responders.device_pause) /* this can never happen! */ + return; + + /* Notify the chipset driver that the pause is complete, which + * will presumably want to send some sort of response to the + * initiator. */ + (*chipset_responders.device_pause) (dev->chipset_bus_no, + dev->chipset_dev_no, status); +} + +/* This is the callback function specified for a function driver, to + * be called when a pending "resume device" operation has been + * completed. + */ +static void +resume_state_change_complete(struct visor_device *dev, int status) +{ + if (!dev->resuming) + return; + + dev->resuming = FALSE; + if (!chipset_responders.device_resume) /* this can never happen! */ + return; + + /* Notify the chipset driver that the resume is complete, + * which will presumably want to send some sort of response to + * the initiator. */ + (*chipset_responders.device_resume) (dev->chipset_bus_no, + dev->chipset_dev_no, status); +} + +/* Tell the subordinate function driver for a specific device to pause + * or resume that device. Result is returned asynchronously via a + * callback function. + */ +static void +initiate_chipset_device_pause_resume(u32 bus_no, u32 dev_no, bool is_pause) +{ + struct visorchipset_device_info dev_info; + struct visor_device *dev = NULL; + int rc = -1, x; + struct visor_driver *drv = NULL; + void (*notify_func)(u32 bus_no, u32 dev_no, int response) = NULL; + + if (is_pause) + notify_func = chipset_responders.device_pause; + else + notify_func = chipset_responders.device_resume; + if (!notify_func) + goto away; + + if (!visorchipset_get_device_info(bus_no, dev_no, &dev_info)) + goto away; + + dev = find_visor_device_by_channel(dev_info.chan_info.channel_addr); + if (!dev) + goto away; + + drv = to_visor_driver(dev->device.driver); + if (!drv) + goto away; + + if (dev->pausing || dev->resuming) + goto away; + + /* Note that even though both drv->pause() and drv->resume + * specify a callback function, it is NOT necessary for us to + * increment our local module usage count. Reason is, there + * is already a linkage dependency between child function + * drivers and visorbus, so it is already IMPOSSIBLE to unload + * visorbus while child function drivers are still running. + */ + if (is_pause) { + if (!drv->pause) + goto away; + + dev->pausing = TRUE; + x = drv->pause(dev, pause_state_change_complete); + } else { + /* This should be done at BUS resume time, but an + * existing problem prevents us from ever getting a bus + * resume... This hack would fail to work should we + * ever have a bus that contains NO devices, since we + * would never even get here in that case. */ + fix_vbus_dev_info(dev); + if (!drv->resume) + goto away; + + dev->resuming = TRUE; + x = drv->resume(dev, resume_state_change_complete); + } + if (x < 0) { + if (is_pause) + dev->pausing = FALSE; + else + dev->resuming = FALSE; + goto away; + } + rc = 0; +away: + if (rc < 0) { + if (notify_func) + (*notify_func)(bus_no, dev_no, rc); + } +} + +static void +chipset_device_pause(u32 bus_no, u32 dev_no) +{ + initiate_chipset_device_pause_resume(bus_no, dev_no, TRUE); +} + +static void +chipset_device_resume(u32 bus_no, u32 dev_no) +{ + initiate_chipset_device_pause_resume(bus_no, dev_no, FALSE); +} + +struct channel_size_info { + uuid_le guid; + unsigned long min_size; + unsigned long max_size; +}; + +static int __init +visorbus_init(void) +{ + int rc = 0; + + POSTCODE_LINUX_3(DRIVER_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO); + bus_device_info_init(&clientbus_driverinfo, + "clientbus", MYDRVNAME, + VERSION, NULL); + + /* process module options */ + + if (visorbus_devicetest > MAXDEVICETEST) + visorbus_devicetest = MAXDEVICETEST; + + rc = create_bus_type(); + if (rc < 0) { + POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, DIAG_SEVERITY_ERR); + goto away; + } + + periodic_dev_workqueue = create_singlethread_workqueue("visorbus_dev"); + if (!periodic_dev_workqueue) { + POSTCODE_LINUX_2(CREATE_WORKQUEUE_PC, DIAG_SEVERITY_ERR); + rc = -ENOMEM; + goto away; + } + + /* This enables us to receive notifications when devices appear for + * which this service partition is to be a server for. + */ + visorchipset_register_busdev_server(&chipset_notifiers, + &chipset_responders, + &chipset_driverinfo); + + rc = 0; + +away: + if (rc) + POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc, + POSTCODE_SEVERITY_ERR); + return rc; +} + +static void +visorbus_exit(void) +{ + struct list_head *listentry, *listtmp; + + visorchipset_register_busdev_server(NULL, NULL, NULL); + remove_all_visor_devices(); + + flush_workqueue(periodic_dev_workqueue); /* better not be any work! */ + destroy_workqueue(periodic_dev_workqueue); + periodic_dev_workqueue = NULL; + + if (periodic_test_workqueue) { + cancel_delayed_work(&periodic_work); + flush_workqueue(periodic_test_workqueue); + destroy_workqueue(periodic_test_workqueue); + periodic_test_workqueue = NULL; + } + + list_for_each_safe(listentry, listtmp, &list_all_bus_instances) { + struct visorbus_devdata *devdata = list_entry(listentry, + struct + visorbus_devdata, + list_all); + remove_bus_instance(devdata); + } + remove_bus_type(); +} + +module_param_named(debug, visorbus_debug, int, S_IRUGO); +MODULE_PARM_DESC(visorbus_debug, "1 to debug"); +int visorbus_debug = 0; + +module_param_named(forcematch, visorbus_forcematch, int, S_IRUGO); +MODULE_PARM_DESC(visorbus_forcematch, + "1 to force a successful dev <--> drv match"); +int visorbus_forcematch = 0; + +module_param_named(forcenomatch, visorbus_forcenomatch, int, S_IRUGO); +MODULE_PARM_DESC(visorbus_forcenomatch, + "1 to force an UNsuccessful dev <--> drv match"); +int visorbus_forcenomatch = 0; + +module_param_named(devicetest, visorbus_devicetest, int, S_IRUGO); +MODULE_PARM_DESC(visorbus_devicetest, + "non-0 to just test device creation and destruction"); +int visorbus_devicetest = 0; + +module_param_named(debugref, visorbus_debugref, int, S_IRUGO); +MODULE_PARM_DESC(visorbus_debugref, "1 to debug reference counting"); +int visorbus_debugref = 0; + +module_param_named(serialloopbacktest, visorbus_serialloopbacktest, + int, S_IRUGO); +MODULE_PARM_DESC(visorbus_serialloopbacktest, + "non-0 to just create 2 serial devices on the same channel"); +int visorbus_serialloopbacktest = 0; + +module_init(visorbus_init); +module_exit(visorbus_exit); + +MODULE_AUTHOR("Unisys"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Supervisor bus driver for service partition: ver " VERSION); +MODULE_VERSION(VERSION); |