Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 482 insertions, 0 deletions

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
new file mode 100644
index 000000000000..21a75ee28b80
--- /dev/null
+++ b/drivers/s390/cio/ccwgroup.c
@@ -0,0 +1,482 @@
+/*
+ *  drivers/s390/cio/ccwgroup.c
+ *  bus driver for ccwgroup
+ *   $Revision: 1.29 $
+ *
+ *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
+ *                       IBM Corporation
+ *    Author(s): Arnd Bergmann (arndb@de.ibm.com)
+ *               Cornelia Huck (cohuck@de.ibm.com)
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/ctype.h>
+#include <linux/dcache.h>
+
+#include <asm/semaphore.h>
+#include <asm/ccwdev.h>
+#include <asm/ccwgroup.h>
+
+/* In Linux 2.4, we had a channel device layer called "chandev"
+ * that did all sorts of obscure stuff for networking devices.
+ * This is another driver that serves as a replacement for just
+ * one of its functions, namely the translation of single subchannels
+ * to devices that use multiple subchannels.
+ */
+
+/* a device matches a driver if all its slave devices match the same
+ * entry of the driver */
+static int
+ccwgroup_bus_match (struct device * dev, struct device_driver * drv)
+{
+        struct ccwgroup_device *gdev;
+        struct ccwgroup_driver *gdrv;
+
+        gdev = container_of(dev, struct ccwgroup_device, dev);
+        gdrv = container_of(drv, struct ccwgroup_driver, driver);
+
+        if (gdev->creator_id == gdrv->driver_id)
+                return 1;
+
+        return 0;
+}
+static int
+ccwgroup_hotplug (struct device *dev, char **envp, int num_envp, char *buffer,
+                  int buffer_size)
+{
+        /* TODO */
+        return 0;
+}
+
+static struct bus_type ccwgroup_bus_type = {
+        .name    = "ccwgroup",
+        .match   = ccwgroup_bus_match,
+        .hotplug = ccwgroup_hotplug,
+};
+
+static inline void
+__ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
+{
+        int i;
+        char str[8];
+
+        for (i = 0; i < gdev->count; i++) {
+                sprintf(str, "cdev%d", i);
+                sysfs_remove_link(&gdev->dev.kobj, str);
+                sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device");
+        }
+        
+}
+
+/*
+ * Provide an 'ungroup' attribute so the user can remove group devices no
+ * longer needed or accidentially created. Saves memory :)
+ */
+static ssize_t
+ccwgroup_ungroup_store(struct device *dev, const char *buf, size_t count)
+{
+        struct ccwgroup_device *gdev;
+
+        gdev = to_ccwgroupdev(dev);
+
+        if (gdev->state != CCWGROUP_OFFLINE)
+                return -EINVAL;
+
+        __ccwgroup_remove_symlinks(gdev);
+        device_unregister(dev);
+
+        return count;
+}
+
+static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store);
+
+static void
+ccwgroup_release (struct device *dev)
+{
+        struct ccwgroup_device *gdev;
+        int i;
+
+        gdev = to_ccwgroupdev(dev);
+
+        for (i = 0; i < gdev->count; i++) {
+                gdev->cdev[i]->dev.driver_data = NULL;
+                put_device(&gdev->cdev[i]->dev);
+        }
+        kfree(gdev);
+}
+
+static inline int
+__ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
+{
+        char str[8];
+        int i, rc;
+
+        for (i = 0; i < gdev->count; i++) {
+                rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, &gdev->dev.kobj,
+                                       "group_device");
+                if (rc) {
+                        for (--i; i >= 0; i--)
+                                sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
+                                                  "group_device");
+                        return rc;
+                }
+        }
+        for (i = 0; i < gdev->count; i++) {
+                sprintf(str, "cdev%d", i);
+                rc = sysfs_create_link(&gdev->dev.kobj, &gdev->cdev[i]->dev.kobj,
+                                       str);
+                if (rc) {
+                        for (--i; i >= 0; i--) {
+                                sprintf(str, "cdev%d", i);
+                                sysfs_remove_link(&gdev->dev.kobj, str);
+                        }
+                        for (i = 0; i < gdev->count; i++)
+                                sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
+                                                  "group_device");
+                        return rc;
+                }
+        }
+        return 0;
+}
+
+/*
+ * try to add a new ccwgroup device for one driver
+ * argc and argv[] are a list of bus_id's of devices
+ * belonging to the driver.
+ */
+int
+ccwgroup_create(struct device *root,
+                unsigned int creator_id,
+                struct ccw_driver *cdrv,
+                int argc, char *argv[])
+{
+        struct ccwgroup_device *gdev;
+        int i;
+        int rc;
+        int del_drvdata;
+
+        if (argc > 256) /* disallow dumb users */
+                return -EINVAL;
+
+        gdev = kmalloc(sizeof(*gdev) + argc*sizeof(gdev->cdev[0]), GFP_KERNEL);
+        if (!gdev)
+                return -ENOMEM;
+
+        memset(gdev, 0, sizeof(*gdev) + argc*sizeof(gdev->cdev[0]));
+        atomic_set(&gdev->onoff, 0);
+
+        del_drvdata = 0;
+        for (i = 0; i < argc; i++) {
+                gdev->cdev[i] = get_ccwdev_by_busid(cdrv, argv[i]);
+
+                /* all devices have to be of the same type in
+                 * order to be grouped */
+                if (!gdev->cdev[i]
+                    || gdev->cdev[i]->id.driver_info !=
+                    gdev->cdev[0]->id.driver_info) {
+                        rc = -EINVAL;
+                        goto free_dev;
+                }
+                /* Don't allow a device to belong to more than one group. */
+                if (gdev->cdev[i]->dev.driver_data) {
+                        rc = -EINVAL;
+                        goto free_dev;
+                }
+        }
+        for (i = 0; i < argc; i++)
+                gdev->cdev[i]->dev.driver_data = gdev;
+        del_drvdata = 1;
+
+        gdev->creator_id = creator_id;
+        gdev->count = argc;
+        gdev->dev = (struct device ) {
+                .bus = &ccwgroup_bus_type,
+                .parent = root,
+                .release = ccwgroup_release,
+        };
+
+        snprintf (gdev->dev.bus_id, BUS_ID_SIZE, "%s",
+                        gdev->cdev[0]->dev.bus_id);
+
+        rc = device_register(&gdev->dev);
+        
+        if (rc)
+                goto free_dev;
+        get_device(&gdev->dev);
+        rc = device_create_file(&gdev->dev, &dev_attr_ungroup);
+
+        if (rc) {
+                device_unregister(&gdev->dev);
+                goto error;
+        }
+
+        rc = __ccwgroup_create_symlinks(gdev);
+        if (!rc) {
+                put_device(&gdev->dev);
+                return 0;
+        }
+        device_remove_file(&gdev->dev, &dev_attr_ungroup);
+        device_unregister(&gdev->dev);
+error:
+        for (i = 0; i < argc; i++)
+                if (gdev->cdev[i]) {
+                        put_device(&gdev->cdev[i]->dev);
+                        gdev->cdev[i]->dev.driver_data = NULL;
+                }
+        put_device(&gdev->dev);
+        return rc;
+free_dev:
+        for (i = 0; i < argc; i++)
+                if (gdev->cdev[i]) {
+                        put_device(&gdev->cdev[i]->dev);
+                        if (del_drvdata)
+                                gdev->cdev[i]->dev.driver_data = NULL;
+                }
+        kfree(gdev);
+        return rc;
+}
+
+static int __init
+init_ccwgroup (void)
+{
+        return bus_register (&ccwgroup_bus_type);
+}
+
+static void __exit
+cleanup_ccwgroup (void)
+{
+        bus_unregister (&ccwgroup_bus_type);
+}
+
+module_init(init_ccwgroup);
+module_exit(cleanup_ccwgroup);
+
+/************************** driver stuff ******************************/
+
+static int
+ccwgroup_set_online(struct ccwgroup_device *gdev)
+{
+        struct ccwgroup_driver *gdrv;
+        int ret;
+
+        if (atomic_compare_and_swap(0, 1, &gdev->onoff))
+                return -EAGAIN;
+        if (gdev->state == CCWGROUP_ONLINE) {
+                ret = 0;
+                goto out;
+        }
+        if (!gdev->dev.driver) {
+                ret = -EINVAL;
+                goto out;
+        }
+        gdrv = to_ccwgroupdrv (gdev->dev.driver);
+        if ((ret = gdrv->set_online(gdev)))
+                goto out;
+
+        gdev->state = CCWGROUP_ONLINE;
+ out:
+        atomic_set(&gdev->onoff, 0);
+        return ret;
+}
+
+static int
+ccwgroup_set_offline(struct ccwgroup_device *gdev)
+{
+        struct ccwgroup_driver *gdrv;
+        int ret;
+
+        if (atomic_compare_and_swap(0, 1, &gdev->onoff))
+                return -EAGAIN;
+        if (gdev->state == CCWGROUP_OFFLINE) {
+                ret = 0;
+                goto out;
+        }
+        if (!gdev->dev.driver) {
+                ret = -EINVAL;
+                goto out;
+        }
+        gdrv = to_ccwgroupdrv (gdev->dev.driver);
+        if ((ret = gdrv->set_offline(gdev)))
+                goto out;
+
+        gdev->state = CCWGROUP_OFFLINE;
+ out:
+        atomic_set(&gdev->onoff, 0);
+        return ret;
+}
+
+static ssize_t
+ccwgroup_online_store (struct device *dev, const char *buf, size_t count)
+{
+        struct ccwgroup_device *gdev;
+        struct ccwgroup_driver *gdrv;
+        unsigned int value;
+        int ret;
+
+        gdev = to_ccwgroupdev(dev);
+        if (!dev->driver)
+                return count;
+
+        gdrv = to_ccwgroupdrv (gdev->dev.driver);
+        if (!try_module_get(gdrv->owner))
+                return -EINVAL;
+
+        value = simple_strtoul(buf, 0, 0);
+        ret = count;
+        if (value == 1)
+                ccwgroup_set_online(gdev);
+        else if (value == 0)
+                ccwgroup_set_offline(gdev);
+        else
+                ret = -EINVAL;
+        module_put(gdrv->owner);
+        return ret;
+}
+
+static ssize_t
+ccwgroup_online_show (struct device *dev, char *buf)
+{
+        int online;
+
+        online = (to_ccwgroupdev(dev)->state == CCWGROUP_ONLINE);
+
+        return sprintf(buf, online ? "1\n" : "0\n");
+}
+
+static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store);
+
+static int
+ccwgroup_probe (struct device *dev)
+{
+        struct ccwgroup_device *gdev;
+        struct ccwgroup_driver *gdrv;
+
+        int ret;
+
+        gdev = to_ccwgroupdev(dev);
+        gdrv = to_ccwgroupdrv(dev->driver);
+
+        if ((ret = device_create_file(dev, &dev_attr_online)))
+                return ret;
+
+        pr_debug("%s: device %s\n", __func__, gdev->dev.bus_id);
+        ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV;
+        if (ret)
+                device_remove_file(dev, &dev_attr_online);
+
+        return ret;
+}
+
+static int
+ccwgroup_remove (struct device *dev)
+{
+        struct ccwgroup_device *gdev;
+        struct ccwgroup_driver *gdrv;
+
+        gdev = to_ccwgroupdev(dev);
+        gdrv = to_ccwgroupdrv(dev->driver);
+
+        pr_debug("%s: device %s\n", __func__, gdev->dev.bus_id);
+
+        device_remove_file(dev, &dev_attr_online);
+
+        if (gdrv && gdrv->remove)
+                gdrv->remove(gdev);
+        return 0;
+}
+
+int
+ccwgroup_driver_register (struct ccwgroup_driver *cdriver)
+{
+        /* register our new driver with the core */
+        cdriver->driver = (struct device_driver) {
+                .bus = &ccwgroup_bus_type,
+                .name = cdriver->name,
+                .probe = ccwgroup_probe,
+                .remove = ccwgroup_remove,
+        };
+
+        return driver_register(&cdriver->driver);
+}
+
+static inline struct device *
+__get_next_ccwgroup_device(struct device_driver *drv)
+{
+        struct device *dev, *d;
+
+        down_read(&drv->bus->subsys.rwsem);
+        dev = NULL;
+        list_for_each_entry(d, &drv->devices, driver_list) {
+                dev = get_device(d);
+                if (dev)
+                        break;
+        }
+        up_read(&drv->bus->subsys.rwsem);
+        return dev;
+}
+
+void
+ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
+{
+        struct device *dev;
+
+        /* We don't want ccwgroup devices to live longer than their driver. */
+        get_driver(&cdriver->driver);
+        while ((dev = __get_next_ccwgroup_device(&cdriver->driver))) {
+                __ccwgroup_remove_symlinks(to_ccwgroupdev(dev));
+                device_unregister(dev);
+                put_device(dev);
+        };
+        put_driver(&cdriver->driver);
+        driver_unregister(&cdriver->driver);
+}
+
+int
+ccwgroup_probe_ccwdev(struct ccw_device *cdev)
+{
+        return 0;
+}
+
+static inline struct ccwgroup_device *
+__ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev)
+{
+        struct ccwgroup_device *gdev;
+
+        if (cdev->dev.driver_data) {
+                gdev = (struct ccwgroup_device *)cdev->dev.driver_data;
+                if (get_device(&gdev->dev)) {
+                        if (!list_empty(&gdev->dev.node))
+                                return gdev;
+                        put_device(&gdev->dev);
+                }
+                return NULL;
+        }
+        return NULL;
+}
+
+void
+ccwgroup_remove_ccwdev(struct ccw_device *cdev)
+{
+        struct ccwgroup_device *gdev;
+
+        /* Ignore offlining errors, device is gone anyway. */
+        ccw_device_set_offline(cdev);
+        /* If one of its devices is gone, the whole group is done for. */
+        gdev = __ccwgroup_get_gdev_by_cdev(cdev);
+        if (gdev) {
+                __ccwgroup_remove_symlinks(gdev);
+                device_unregister(&gdev->dev);
+                put_device(&gdev->dev);
+        }
+}
+
+MODULE_LICENSE("GPL");
+EXPORT_SYMBOL(ccwgroup_driver_register);
+EXPORT_SYMBOL(ccwgroup_driver_unregister);
+EXPORT_SYMBOL(ccwgroup_create);
+EXPORT_SYMBOL(ccwgroup_probe_ccwdev);
+EXPORT_SYMBOL(ccwgroup_remove_ccwdev);