![Jingoo Han](/assets/img/avatar_default.png)
The usage of strict_strtoul() is not preferred, because strict_strtoul() is obsolete. Thus, kstrtoul() should be used. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
642 lines
16 KiB
C
642 lines
16 KiB
C
/*
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* bus driver for ccwgroup
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*
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* Copyright IBM Corp. 2002, 2012
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*
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* Author(s): Arnd Bergmann (arndb@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/ctype.h>
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#include <linux/dcache.h>
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#include <asm/cio.h>
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#include <asm/ccwdev.h>
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#include <asm/ccwgroup.h>
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#include "device.h"
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#define CCW_BUS_ID_SIZE 10
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/* In Linux 2.4, we had a channel device layer called "chandev"
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* that did all sorts of obscure stuff for networking devices.
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* This is another driver that serves as a replacement for just
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* one of its functions, namely the translation of single subchannels
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* to devices that use multiple subchannels.
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*/
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static struct bus_type ccwgroup_bus_type;
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static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
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{
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int i;
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char str[8];
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for (i = 0; i < gdev->count; i++) {
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sprintf(str, "cdev%d", i);
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sysfs_remove_link(&gdev->dev.kobj, str);
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sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device");
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}
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}
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/*
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* Remove references from ccw devices to ccw group device and from
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* ccw group device to ccw devices.
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*/
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static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev)
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{
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struct ccw_device *cdev;
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int i;
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for (i = 0; i < gdev->count; i++) {
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cdev = gdev->cdev[i];
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if (!cdev)
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continue;
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spin_lock_irq(cdev->ccwlock);
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dev_set_drvdata(&cdev->dev, NULL);
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spin_unlock_irq(cdev->ccwlock);
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gdev->cdev[i] = NULL;
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put_device(&cdev->dev);
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}
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}
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/**
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* ccwgroup_set_online() - enable a ccwgroup device
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* @gdev: target ccwgroup device
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*
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* This function attempts to put the ccwgroup device into the online state.
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* Returns:
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* %0 on success and a negative error value on failure.
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*/
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int ccwgroup_set_online(struct ccwgroup_device *gdev)
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{
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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int ret = -EINVAL;
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if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
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return -EAGAIN;
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if (gdev->state == CCWGROUP_ONLINE)
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goto out;
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if (gdrv->set_online)
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ret = gdrv->set_online(gdev);
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if (ret)
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goto out;
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gdev->state = CCWGROUP_ONLINE;
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out:
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atomic_set(&gdev->onoff, 0);
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return ret;
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}
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EXPORT_SYMBOL(ccwgroup_set_online);
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/**
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* ccwgroup_set_offline() - disable a ccwgroup device
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* @gdev: target ccwgroup device
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*
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* This function attempts to put the ccwgroup device into the offline state.
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* Returns:
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* %0 on success and a negative error value on failure.
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*/
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int ccwgroup_set_offline(struct ccwgroup_device *gdev)
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{
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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int ret = -EINVAL;
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if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
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return -EAGAIN;
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if (gdev->state == CCWGROUP_OFFLINE)
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goto out;
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if (gdrv->set_offline)
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ret = gdrv->set_offline(gdev);
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if (ret)
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goto out;
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gdev->state = CCWGROUP_OFFLINE;
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out:
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atomic_set(&gdev->onoff, 0);
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return ret;
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}
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EXPORT_SYMBOL(ccwgroup_set_offline);
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static ssize_t ccwgroup_online_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
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unsigned long value;
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int ret;
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if (!dev->driver)
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return -EINVAL;
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if (!try_module_get(gdrv->driver.owner))
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return -EINVAL;
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ret = kstrtoul(buf, 0, &value);
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if (ret)
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goto out;
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if (value == 1)
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ret = ccwgroup_set_online(gdev);
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else if (value == 0)
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ret = ccwgroup_set_offline(gdev);
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else
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ret = -EINVAL;
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out:
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module_put(gdrv->driver.owner);
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return (ret == 0) ? count : ret;
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}
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static ssize_t ccwgroup_online_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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int online;
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online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0;
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return scnprintf(buf, PAGE_SIZE, "%d\n", online);
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}
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/*
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* Provide an 'ungroup' attribute so the user can remove group devices no
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* longer needed or accidentially created. Saves memory :)
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*/
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static void ccwgroup_ungroup_callback(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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mutex_lock(&gdev->reg_mutex);
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if (device_is_registered(&gdev->dev)) {
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__ccwgroup_remove_symlinks(gdev);
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device_unregister(dev);
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__ccwgroup_remove_cdev_refs(gdev);
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}
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mutex_unlock(&gdev->reg_mutex);
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}
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static ssize_t ccwgroup_ungroup_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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int rc;
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/* Prevent concurrent online/offline processing and ungrouping. */
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if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
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return -EAGAIN;
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if (gdev->state != CCWGROUP_OFFLINE) {
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rc = -EINVAL;
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goto out;
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}
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/* Note that we cannot unregister the device from one of its
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* attribute methods, so we have to use this roundabout approach.
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*/
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rc = device_schedule_callback(dev, ccwgroup_ungroup_callback);
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out:
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if (rc) {
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if (rc != -EAGAIN)
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/* Release onoff "lock" when ungrouping failed. */
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atomic_set(&gdev->onoff, 0);
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return rc;
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}
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return count;
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}
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static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store);
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static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store);
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static struct attribute *ccwgroup_attrs[] = {
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&dev_attr_online.attr,
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&dev_attr_ungroup.attr,
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NULL,
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};
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static struct attribute_group ccwgroup_attr_group = {
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.attrs = ccwgroup_attrs,
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};
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static const struct attribute_group *ccwgroup_attr_groups[] = {
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&ccwgroup_attr_group,
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NULL,
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};
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static void ccwgroup_release(struct device *dev)
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{
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kfree(to_ccwgroupdev(dev));
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}
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static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
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{
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char str[8];
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int i, rc;
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for (i = 0; i < gdev->count; i++) {
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rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj,
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&gdev->dev.kobj, "group_device");
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if (rc) {
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for (--i; i >= 0; i--)
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sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
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"group_device");
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return rc;
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}
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}
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for (i = 0; i < gdev->count; i++) {
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sprintf(str, "cdev%d", i);
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rc = sysfs_create_link(&gdev->dev.kobj,
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&gdev->cdev[i]->dev.kobj, str);
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if (rc) {
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for (--i; i >= 0; i--) {
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sprintf(str, "cdev%d", i);
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sysfs_remove_link(&gdev->dev.kobj, str);
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}
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for (i = 0; i < gdev->count; i++)
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sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
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"group_device");
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return rc;
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}
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}
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return 0;
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}
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static int __get_next_id(const char **buf, struct ccw_dev_id *id)
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{
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unsigned int cssid, ssid, devno;
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int ret = 0, len;
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char *start, *end;
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start = (char *)*buf;
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end = strchr(start, ',');
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if (!end) {
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/* Last entry. Strip trailing newline, if applicable. */
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end = strchr(start, '\n');
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if (end)
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*end = '\0';
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len = strlen(start) + 1;
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} else {
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len = end - start + 1;
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end++;
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}
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if (len <= CCW_BUS_ID_SIZE) {
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if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3)
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ret = -EINVAL;
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} else
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ret = -EINVAL;
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if (!ret) {
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id->ssid = ssid;
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id->devno = devno;
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}
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*buf = end;
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return ret;
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}
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/**
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* ccwgroup_create_dev() - create and register a ccw group device
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* @parent: parent device for the new device
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* @gdrv: driver for the new group device
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* @num_devices: number of slave devices
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* @buf: buffer containing comma separated bus ids of slave devices
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*
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* Create and register a new ccw group device as a child of @parent. Slave
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* devices are obtained from the list of bus ids given in @buf.
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* Returns:
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* %0 on success and an error code on failure.
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* Context:
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* non-atomic
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*/
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int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
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int num_devices, const char *buf)
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{
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struct ccwgroup_device *gdev;
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struct ccw_dev_id dev_id;
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int rc, i;
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gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]),
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GFP_KERNEL);
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if (!gdev)
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return -ENOMEM;
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atomic_set(&gdev->onoff, 0);
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mutex_init(&gdev->reg_mutex);
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mutex_lock(&gdev->reg_mutex);
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gdev->count = num_devices;
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gdev->dev.bus = &ccwgroup_bus_type;
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gdev->dev.parent = parent;
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gdev->dev.release = ccwgroup_release;
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device_initialize(&gdev->dev);
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for (i = 0; i < num_devices && buf; i++) {
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rc = __get_next_id(&buf, &dev_id);
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if (rc != 0)
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goto error;
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gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id);
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/*
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* All devices have to be of the same type in
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* order to be grouped.
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*/
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if (!gdev->cdev[i] || !gdev->cdev[i]->drv ||
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gdev->cdev[i]->drv != gdev->cdev[0]->drv ||
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gdev->cdev[i]->id.driver_info !=
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gdev->cdev[0]->id.driver_info) {
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rc = -EINVAL;
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goto error;
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}
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/* Don't allow a device to belong to more than one group. */
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spin_lock_irq(gdev->cdev[i]->ccwlock);
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if (dev_get_drvdata(&gdev->cdev[i]->dev)) {
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spin_unlock_irq(gdev->cdev[i]->ccwlock);
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rc = -EINVAL;
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goto error;
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}
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dev_set_drvdata(&gdev->cdev[i]->dev, gdev);
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spin_unlock_irq(gdev->cdev[i]->ccwlock);
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}
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/* Check for sufficient number of bus ids. */
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if (i < num_devices) {
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rc = -EINVAL;
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goto error;
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}
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/* Check for trailing stuff. */
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if (i == num_devices && strlen(buf) > 0) {
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rc = -EINVAL;
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goto error;
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}
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dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev));
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gdev->dev.groups = ccwgroup_attr_groups;
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if (gdrv) {
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gdev->dev.driver = &gdrv->driver;
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rc = gdrv->setup ? gdrv->setup(gdev) : 0;
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if (rc)
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goto error;
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}
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rc = device_add(&gdev->dev);
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if (rc)
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goto error;
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rc = __ccwgroup_create_symlinks(gdev);
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if (rc) {
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device_del(&gdev->dev);
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goto error;
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}
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mutex_unlock(&gdev->reg_mutex);
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return 0;
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error:
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for (i = 0; i < num_devices; i++)
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if (gdev->cdev[i]) {
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spin_lock_irq(gdev->cdev[i]->ccwlock);
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if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev)
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dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
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spin_unlock_irq(gdev->cdev[i]->ccwlock);
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put_device(&gdev->cdev[i]->dev);
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gdev->cdev[i] = NULL;
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}
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mutex_unlock(&gdev->reg_mutex);
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put_device(&gdev->dev);
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return rc;
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}
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EXPORT_SYMBOL(ccwgroup_create_dev);
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static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
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void *data)
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{
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struct device *dev = data;
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if (action == BUS_NOTIFY_UNBIND_DRIVER)
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device_schedule_callback(dev, ccwgroup_ungroup_callback);
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return NOTIFY_OK;
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}
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static struct notifier_block ccwgroup_nb = {
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.notifier_call = ccwgroup_notifier
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};
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static int __init init_ccwgroup(void)
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{
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int ret;
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ret = bus_register(&ccwgroup_bus_type);
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if (ret)
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return ret;
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ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
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if (ret)
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bus_unregister(&ccwgroup_bus_type);
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return ret;
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}
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static void __exit cleanup_ccwgroup(void)
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{
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bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
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bus_unregister(&ccwgroup_bus_type);
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}
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module_init(init_ccwgroup);
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module_exit(cleanup_ccwgroup);
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/************************** driver stuff ******************************/
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static int ccwgroup_remove(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
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if (!dev->driver)
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return 0;
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if (gdrv->remove)
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gdrv->remove(gdev);
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return 0;
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}
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static void ccwgroup_shutdown(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
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if (!dev->driver)
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return;
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if (gdrv->shutdown)
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gdrv->shutdown(gdev);
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}
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static int ccwgroup_pm_prepare(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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/* Fail while device is being set online/offline. */
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if (atomic_read(&gdev->onoff))
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return -EAGAIN;
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return 0;
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return gdrv->prepare ? gdrv->prepare(gdev) : 0;
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}
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static void ccwgroup_pm_complete(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return;
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if (gdrv->complete)
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gdrv->complete(gdev);
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}
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static int ccwgroup_pm_freeze(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return 0;
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return gdrv->freeze ? gdrv->freeze(gdev) : 0;
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}
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static int ccwgroup_pm_thaw(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
|
|
|
|
if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
|
|
return 0;
|
|
|
|
return gdrv->thaw ? gdrv->thaw(gdev) : 0;
|
|
}
|
|
|
|
static int ccwgroup_pm_restore(struct device *dev)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
|
|
|
|
if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
|
|
return 0;
|
|
|
|
return gdrv->restore ? gdrv->restore(gdev) : 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops ccwgroup_pm_ops = {
|
|
.prepare = ccwgroup_pm_prepare,
|
|
.complete = ccwgroup_pm_complete,
|
|
.freeze = ccwgroup_pm_freeze,
|
|
.thaw = ccwgroup_pm_thaw,
|
|
.restore = ccwgroup_pm_restore,
|
|
};
|
|
|
|
static struct bus_type ccwgroup_bus_type = {
|
|
.name = "ccwgroup",
|
|
.remove = ccwgroup_remove,
|
|
.shutdown = ccwgroup_shutdown,
|
|
.pm = &ccwgroup_pm_ops,
|
|
};
|
|
|
|
/**
|
|
* ccwgroup_driver_register() - register a ccw group driver
|
|
* @cdriver: driver to be registered
|
|
*
|
|
* This function is mainly a wrapper around driver_register().
|
|
*/
|
|
int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
|
|
{
|
|
/* register our new driver with the core */
|
|
cdriver->driver.bus = &ccwgroup_bus_type;
|
|
|
|
return driver_register(&cdriver->driver);
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_driver_register);
|
|
|
|
static int __ccwgroup_match_all(struct device *dev, void *data)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* ccwgroup_driver_unregister() - deregister a ccw group driver
|
|
* @cdriver: driver to be deregistered
|
|
*
|
|
* This function is mainly a wrapper around driver_unregister().
|
|
*/
|
|
void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
|
|
{
|
|
struct device *dev;
|
|
|
|
/* We don't want ccwgroup devices to live longer than their driver. */
|
|
while ((dev = driver_find_device(&cdriver->driver, NULL, NULL,
|
|
__ccwgroup_match_all))) {
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
|
|
mutex_lock(&gdev->reg_mutex);
|
|
__ccwgroup_remove_symlinks(gdev);
|
|
device_unregister(dev);
|
|
__ccwgroup_remove_cdev_refs(gdev);
|
|
mutex_unlock(&gdev->reg_mutex);
|
|
put_device(dev);
|
|
}
|
|
driver_unregister(&cdriver->driver);
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_driver_unregister);
|
|
|
|
/**
|
|
* ccwgroup_probe_ccwdev() - probe function for slave devices
|
|
* @cdev: ccw device to be probed
|
|
*
|
|
* This is a dummy probe function for ccw devices that are slave devices in
|
|
* a ccw group device.
|
|
* Returns:
|
|
* always %0
|
|
*/
|
|
int ccwgroup_probe_ccwdev(struct ccw_device *cdev)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_probe_ccwdev);
|
|
|
|
/**
|
|
* ccwgroup_remove_ccwdev() - remove function for slave devices
|
|
* @cdev: ccw device to be removed
|
|
*
|
|
* This is a remove function for ccw devices that are slave devices in a ccw
|
|
* group device. It sets the ccw device offline and also deregisters the
|
|
* embedding ccw group device.
|
|
*/
|
|
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. */
|
|
spin_lock_irq(cdev->ccwlock);
|
|
gdev = dev_get_drvdata(&cdev->dev);
|
|
if (!gdev) {
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
return;
|
|
}
|
|
/* Get ccwgroup device reference for local processing. */
|
|
get_device(&gdev->dev);
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
/* Unregister group device. */
|
|
mutex_lock(&gdev->reg_mutex);
|
|
if (device_is_registered(&gdev->dev)) {
|
|
__ccwgroup_remove_symlinks(gdev);
|
|
device_unregister(&gdev->dev);
|
|
__ccwgroup_remove_cdev_refs(gdev);
|
|
}
|
|
mutex_unlock(&gdev->reg_mutex);
|
|
/* Release ccwgroup device reference for local processing. */
|
|
put_device(&gdev->dev);
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_remove_ccwdev);
|
|
MODULE_LICENSE("GPL");
|