mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
- Use overflow helpers in 2-factor allocators (Kees, Rasmus) - Introduce overflow test module (Rasmus, Kees) - Introduce saturating size helper functions (Matthew, Kees) - Treewide use of struct_size() for allocators (Kees) -----BEGIN PGP SIGNATURE----- Comment: Kees Cook <kees@outflux.net> iQJKBAABCgA0FiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAlsYJ1gWHGtlZXNjb29r QGNocm9taXVtLm9yZwAKCRCJcvTf3G3AJlCTEACwdEeriAd2VwxknnsstojGD/3g 8TTFA19vSu4Gxa6WiDkjGoSmIlfhXTlZo1Nlmencv16ytSvIVDNLUIB3uDxUIv1J 2+dyHML9JpXYHHR7zLXXnGFJL0wazqjbsD3NYQgXqmun7EVVYnOsAlBZ7h/Lwiej jzEJd8DaHT3TA586uD3uggiFvQU0yVyvkDCDONIytmQx+BdtGdg9TYCzkBJaXuDZ YIthyKDvxIw5nh/UaG3L+SKo73tUr371uAWgAfqoaGQQCWe+mxnWL4HkCKsjFzZL u9ouxxF/n6pij3E8n6rb0i2fCzlsTDdDF+aqV1rQ4I4hVXCFPpHUZgjDPvBWbj7A m6AfRHVNnOgI8HGKqBGOfViV+2kCHlYeQh3pPW33dWzy/4d/uq9NIHKxE63LH+S4 bY3oO2ela8oxRyvEgXLjqmRYGW1LB/ZU7FS6Rkx2gRzo4k8Rv+8K/KzUHfFVRX61 jEbiPLzko0xL9D53kcEn0c+BhofK5jgeSWxItdmfuKjLTW4jWhLRlU+bcUXb6kSS S3G6aF+L+foSUwoq63AS8QxCuabuhreJSB+BmcGUyjthCbK/0WjXYC6W/IJiRfBa 3ZTxBC/2vP3uq/AGRNh5YZoxHL8mSxDfn62F+2cqlJTTKR/O+KyDb1cusyvk3H04 KCDVLYPxwQQqK1Mqig== =/3L8 -----END PGP SIGNATURE----- Merge tag 'overflow-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull overflow updates from Kees Cook: "This adds the new overflow checking helpers and adds them to the 2-factor argument allocators. And this adds the saturating size helpers and does a treewide replacement for the struct_size() usage. Additionally this adds the overflow testing modules to make sure everything works. I'm still working on the treewide replacements for allocators with "simple" multiplied arguments: *alloc(a * b, ...) -> *alloc_array(a, b, ...) and *zalloc(a * b, ...) -> *calloc(a, b, ...) as well as the more complex cases, but that's separable from this portion of the series. I expect to have the rest sent before -rc1 closes; there are a lot of messy cases to clean up. Summary: - Introduce arithmetic overflow test helper functions (Rasmus) - Use overflow helpers in 2-factor allocators (Kees, Rasmus) - Introduce overflow test module (Rasmus, Kees) - Introduce saturating size helper functions (Matthew, Kees) - Treewide use of struct_size() for allocators (Kees)" * tag 'overflow-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: treewide: Use struct_size() for devm_kmalloc() and friends treewide: Use struct_size() for vmalloc()-family treewide: Use struct_size() for kmalloc()-family device: Use overflow helpers for devm_kmalloc() mm: Use overflow helpers in kvmalloc() mm: Use overflow helpers in kmalloc_array*() test_overflow: Add memory allocation overflow tests overflow.h: Add allocation size calculation helpers test_overflow: Report test failures test_overflow: macrofy some more, do more tests for free lib: add runtime test of check_*_overflow functions compiler.h: enable builtin overflow checkers and add fallback code
656 lines
16 KiB
C
656 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* bus driver for ccwgroup
|
|
*
|
|
* Copyright IBM Corp. 2002, 2012
|
|
*
|
|
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
|
|
* Cornelia Huck (cornelia.huck@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/cio.h>
|
|
#include <asm/ccwdev.h>
|
|
#include <asm/ccwgroup.h>
|
|
|
|
#include "device.h"
|
|
|
|
#define CCW_BUS_ID_SIZE 10
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
static struct bus_type ccwgroup_bus_type;
|
|
|
|
static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
|
|
{
|
|
int i;
|
|
char str[16];
|
|
|
|
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");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove references from ccw devices to ccw group device and from
|
|
* ccw group device to ccw devices.
|
|
*/
|
|
static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev)
|
|
{
|
|
struct ccw_device *cdev;
|
|
int i;
|
|
|
|
for (i = 0; i < gdev->count; i++) {
|
|
cdev = gdev->cdev[i];
|
|
if (!cdev)
|
|
continue;
|
|
spin_lock_irq(cdev->ccwlock);
|
|
dev_set_drvdata(&cdev->dev, NULL);
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
gdev->cdev[i] = NULL;
|
|
put_device(&cdev->dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ccwgroup_set_online() - enable a ccwgroup device
|
|
* @gdev: target ccwgroup device
|
|
*
|
|
* This function attempts to put the ccwgroup device into the online state.
|
|
* Returns:
|
|
* %0 on success and a negative error value on failure.
|
|
*/
|
|
int ccwgroup_set_online(struct ccwgroup_device *gdev)
|
|
{
|
|
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
|
|
int ret = -EINVAL;
|
|
|
|
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
|
|
return -EAGAIN;
|
|
if (gdev->state == CCWGROUP_ONLINE)
|
|
goto out;
|
|
if (gdrv->set_online)
|
|
ret = gdrv->set_online(gdev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
gdev->state = CCWGROUP_ONLINE;
|
|
out:
|
|
atomic_set(&gdev->onoff, 0);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_set_online);
|
|
|
|
/**
|
|
* ccwgroup_set_offline() - disable a ccwgroup device
|
|
* @gdev: target ccwgroup device
|
|
*
|
|
* This function attempts to put the ccwgroup device into the offline state.
|
|
* Returns:
|
|
* %0 on success and a negative error value on failure.
|
|
*/
|
|
int ccwgroup_set_offline(struct ccwgroup_device *gdev)
|
|
{
|
|
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
|
|
int ret = -EINVAL;
|
|
|
|
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
|
|
return -EAGAIN;
|
|
if (gdev->state == CCWGROUP_OFFLINE)
|
|
goto out;
|
|
if (gdrv->set_offline)
|
|
ret = gdrv->set_offline(gdev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
gdev->state = CCWGROUP_OFFLINE;
|
|
out:
|
|
atomic_set(&gdev->onoff, 0);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_set_offline);
|
|
|
|
static ssize_t ccwgroup_online_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
unsigned long value;
|
|
int ret;
|
|
|
|
device_lock(dev);
|
|
if (!dev->driver) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = kstrtoul(buf, 0, &value);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (value == 1)
|
|
ret = ccwgroup_set_online(gdev);
|
|
else if (value == 0)
|
|
ret = ccwgroup_set_offline(gdev);
|
|
else
|
|
ret = -EINVAL;
|
|
out:
|
|
device_unlock(dev);
|
|
return (ret == 0) ? count : ret;
|
|
}
|
|
|
|
static ssize_t ccwgroup_online_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
int online;
|
|
|
|
online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", online);
|
|
}
|
|
|
|
/*
|
|
* Provide an 'ungroup' attribute so the user can remove group devices no
|
|
* longer needed or accidentially created. Saves memory :)
|
|
*/
|
|
static void ccwgroup_ungroup(struct ccwgroup_device *gdev)
|
|
{
|
|
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);
|
|
}
|
|
|
|
static ssize_t ccwgroup_ungroup_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
int rc = 0;
|
|
|
|
/* Prevent concurrent online/offline processing and ungrouping. */
|
|
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
|
|
return -EAGAIN;
|
|
if (gdev->state != CCWGROUP_OFFLINE) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (device_remove_file_self(dev, attr))
|
|
ccwgroup_ungroup(gdev);
|
|
else
|
|
rc = -ENODEV;
|
|
out:
|
|
if (rc) {
|
|
/* Release onoff "lock" when ungrouping failed. */
|
|
atomic_set(&gdev->onoff, 0);
|
|
return rc;
|
|
}
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store);
|
|
static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store);
|
|
|
|
static struct attribute *ccwgroup_attrs[] = {
|
|
&dev_attr_online.attr,
|
|
&dev_attr_ungroup.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group ccwgroup_attr_group = {
|
|
.attrs = ccwgroup_attrs,
|
|
};
|
|
static const struct attribute_group *ccwgroup_attr_groups[] = {
|
|
&ccwgroup_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static void ccwgroup_ungroup_workfn(struct work_struct *work)
|
|
{
|
|
struct ccwgroup_device *gdev =
|
|
container_of(work, struct ccwgroup_device, ungroup_work);
|
|
|
|
ccwgroup_ungroup(gdev);
|
|
put_device(&gdev->dev);
|
|
}
|
|
|
|
static void ccwgroup_release(struct device *dev)
|
|
{
|
|
kfree(to_ccwgroupdev(dev));
|
|
}
|
|
|
|
static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
|
|
{
|
|
char str[16];
|
|
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;
|
|
}
|
|
|
|
static int __get_next_id(const char **buf, struct ccw_dev_id *id)
|
|
{
|
|
unsigned int cssid, ssid, devno;
|
|
int ret = 0, len;
|
|
char *start, *end;
|
|
|
|
start = (char *)*buf;
|
|
end = strchr(start, ',');
|
|
if (!end) {
|
|
/* Last entry. Strip trailing newline, if applicable. */
|
|
end = strchr(start, '\n');
|
|
if (end)
|
|
*end = '\0';
|
|
len = strlen(start) + 1;
|
|
} else {
|
|
len = end - start + 1;
|
|
end++;
|
|
}
|
|
if (len <= CCW_BUS_ID_SIZE) {
|
|
if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3)
|
|
ret = -EINVAL;
|
|
} else
|
|
ret = -EINVAL;
|
|
|
|
if (!ret) {
|
|
id->ssid = ssid;
|
|
id->devno = devno;
|
|
}
|
|
*buf = end;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ccwgroup_create_dev() - create and register a ccw group device
|
|
* @parent: parent device for the new device
|
|
* @gdrv: driver for the new group device
|
|
* @num_devices: number of slave devices
|
|
* @buf: buffer containing comma separated bus ids of slave devices
|
|
*
|
|
* Create and register a new ccw group device as a child of @parent. Slave
|
|
* devices are obtained from the list of bus ids given in @buf.
|
|
* Returns:
|
|
* %0 on success and an error code on failure.
|
|
* Context:
|
|
* non-atomic
|
|
*/
|
|
int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
|
|
int num_devices, const char *buf)
|
|
{
|
|
struct ccwgroup_device *gdev;
|
|
struct ccw_dev_id dev_id;
|
|
int rc, i;
|
|
|
|
if (num_devices < 1)
|
|
return -EINVAL;
|
|
|
|
gdev = kzalloc(struct_size(gdev, cdev, num_devices), GFP_KERNEL);
|
|
if (!gdev)
|
|
return -ENOMEM;
|
|
|
|
atomic_set(&gdev->onoff, 0);
|
|
mutex_init(&gdev->reg_mutex);
|
|
mutex_lock(&gdev->reg_mutex);
|
|
INIT_WORK(&gdev->ungroup_work, ccwgroup_ungroup_workfn);
|
|
gdev->count = num_devices;
|
|
gdev->dev.bus = &ccwgroup_bus_type;
|
|
gdev->dev.parent = parent;
|
|
gdev->dev.release = ccwgroup_release;
|
|
device_initialize(&gdev->dev);
|
|
|
|
for (i = 0; i < num_devices && buf; i++) {
|
|
rc = __get_next_id(&buf, &dev_id);
|
|
if (rc != 0)
|
|
goto error;
|
|
gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id);
|
|
/*
|
|
* All devices have to be of the same type in
|
|
* order to be grouped.
|
|
*/
|
|
if (!gdev->cdev[i] || !gdev->cdev[i]->drv ||
|
|
gdev->cdev[i]->drv != gdev->cdev[0]->drv ||
|
|
gdev->cdev[i]->id.driver_info !=
|
|
gdev->cdev[0]->id.driver_info) {
|
|
rc = -EINVAL;
|
|
goto error;
|
|
}
|
|
/* Don't allow a device to belong to more than one group. */
|
|
spin_lock_irq(gdev->cdev[i]->ccwlock);
|
|
if (dev_get_drvdata(&gdev->cdev[i]->dev)) {
|
|
spin_unlock_irq(gdev->cdev[i]->ccwlock);
|
|
rc = -EINVAL;
|
|
goto error;
|
|
}
|
|
dev_set_drvdata(&gdev->cdev[i]->dev, gdev);
|
|
spin_unlock_irq(gdev->cdev[i]->ccwlock);
|
|
}
|
|
/* Check for sufficient number of bus ids. */
|
|
if (i < num_devices) {
|
|
rc = -EINVAL;
|
|
goto error;
|
|
}
|
|
/* Check for trailing stuff. */
|
|
if (i == num_devices && strlen(buf) > 0) {
|
|
rc = -EINVAL;
|
|
goto error;
|
|
}
|
|
/* Check if the devices are bound to the required ccw driver. */
|
|
if (gdrv && gdrv->ccw_driver &&
|
|
gdev->cdev[0]->drv != gdrv->ccw_driver) {
|
|
rc = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev));
|
|
gdev->dev.groups = ccwgroup_attr_groups;
|
|
|
|
if (gdrv) {
|
|
gdev->dev.driver = &gdrv->driver;
|
|
rc = gdrv->setup ? gdrv->setup(gdev) : 0;
|
|
if (rc)
|
|
goto error;
|
|
}
|
|
rc = device_add(&gdev->dev);
|
|
if (rc)
|
|
goto error;
|
|
rc = __ccwgroup_create_symlinks(gdev);
|
|
if (rc) {
|
|
device_del(&gdev->dev);
|
|
goto error;
|
|
}
|
|
mutex_unlock(&gdev->reg_mutex);
|
|
return 0;
|
|
error:
|
|
for (i = 0; i < num_devices; i++)
|
|
if (gdev->cdev[i]) {
|
|
spin_lock_irq(gdev->cdev[i]->ccwlock);
|
|
if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev)
|
|
dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
|
|
spin_unlock_irq(gdev->cdev[i]->ccwlock);
|
|
put_device(&gdev->cdev[i]->dev);
|
|
gdev->cdev[i] = NULL;
|
|
}
|
|
mutex_unlock(&gdev->reg_mutex);
|
|
put_device(&gdev->dev);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_create_dev);
|
|
|
|
static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
|
|
void *data)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(data);
|
|
|
|
if (action == BUS_NOTIFY_UNBIND_DRIVER) {
|
|
get_device(&gdev->dev);
|
|
schedule_work(&gdev->ungroup_work);
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block ccwgroup_nb = {
|
|
.notifier_call = ccwgroup_notifier
|
|
};
|
|
|
|
static int __init init_ccwgroup(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = bus_register(&ccwgroup_bus_type);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
|
|
if (ret)
|
|
bus_unregister(&ccwgroup_bus_type);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit cleanup_ccwgroup(void)
|
|
{
|
|
bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
|
|
bus_unregister(&ccwgroup_bus_type);
|
|
}
|
|
|
|
module_init(init_ccwgroup);
|
|
module_exit(cleanup_ccwgroup);
|
|
|
|
/************************** driver stuff ******************************/
|
|
|
|
static int ccwgroup_remove(struct device *dev)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
|
|
|
|
if (!dev->driver)
|
|
return 0;
|
|
if (gdrv->remove)
|
|
gdrv->remove(gdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ccwgroup_shutdown(struct device *dev)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
|
|
|
|
if (!dev->driver)
|
|
return;
|
|
if (gdrv->shutdown)
|
|
gdrv->shutdown(gdev);
|
|
}
|
|
|
|
static int ccwgroup_pm_prepare(struct device *dev)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
|
|
|
|
/* Fail while device is being set online/offline. */
|
|
if (atomic_read(&gdev->onoff))
|
|
return -EAGAIN;
|
|
|
|
if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
|
|
return 0;
|
|
|
|
return gdrv->prepare ? gdrv->prepare(gdev) : 0;
|
|
}
|
|
|
|
static void ccwgroup_pm_complete(struct device *dev)
|
|
{
|
|
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
|
|
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
|
|
|
|
if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
|
|
return;
|
|
|
|
if (gdrv->complete)
|
|
gdrv->complete(gdev);
|
|
}
|
|
|
|
static int ccwgroup_pm_freeze(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->freeze ? gdrv->freeze(gdev) : 0;
|
|
}
|
|
|
|
static int ccwgroup_pm_thaw(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->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,
|
|
};
|
|
|
|
bool dev_is_ccwgroup(struct device *dev)
|
|
{
|
|
return dev->bus == &ccwgroup_bus_type;
|
|
}
|
|
EXPORT_SYMBOL(dev_is_ccwgroup);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
ccwgroup_ungroup(gdev);
|
|
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. */
|
|
ccwgroup_ungroup(gdev);
|
|
/* Release ccwgroup device reference for local processing. */
|
|
put_device(&gdev->dev);
|
|
}
|
|
EXPORT_SYMBOL(ccwgroup_remove_ccwdev);
|
|
MODULE_LICENSE("GPL");
|