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3566ee1d77
As vfio-ccw devices are created/destroyed, the uuid of the associated mdevs that are recorded in $S390DBF/vfio_ccw_msg/sprintf get lost. This is because a pointer to the UUID is stored instead of the UUID itself, and that memory may have been repurposed if/when the logs are examined. The result is usually garbage UUID data in the logs, though there is an outside chance of an oops happening here. Simply remove the UUID from the traces, as the subchannel number will provide useful configuration information for problem determination, and is stored directly into the log instead of a pointer. As we were the only consumer of mdev_uuid(), remove that too. Cc: Kirti Wankhede <kwankhede@nvidia.com> Signed-off-by: Michael Kawano <mkawano@linux.ibm.com> Fixes:60e05d1cf0("vfio-ccw: add some logging") Fixes:b7701dfbf9("vfio-ccw: Register a chp_event callback for vfio-ccw") [farman: reworded commit message, added Fixes: tags] Signed-off-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com> Link: https://lore.kernel.org/r/20220707135737.720765-2-farman@linux.ibm.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Mediated device definition
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*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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* Author: Neo Jia <cjia@nvidia.com>
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* Kirti Wankhede <kwankhede@nvidia.com>
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*/
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#ifndef MDEV_H
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#define MDEV_H
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struct mdev_type;
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struct mdev_device {
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struct device dev;
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guid_t uuid;
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struct list_head next;
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struct mdev_type *type;
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bool active;
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};
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static inline struct mdev_device *to_mdev_device(struct device *dev)
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{
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return container_of(dev, struct mdev_device, dev);
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}
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unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
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unsigned int mtype_get_type_group_id(struct mdev_type *mtype);
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struct device *mtype_get_parent_dev(struct mdev_type *mtype);
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/* interface for exporting mdev supported type attributes */
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struct mdev_type_attribute {
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struct attribute attr;
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ssize_t (*show)(struct mdev_type *mtype,
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struct mdev_type_attribute *attr, char *buf);
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ssize_t (*store)(struct mdev_type *mtype,
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struct mdev_type_attribute *attr, const char *buf,
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size_t count);
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};
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#define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \
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struct mdev_type_attribute mdev_type_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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#define MDEV_TYPE_ATTR_RW(_name) \
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struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name)
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#define MDEV_TYPE_ATTR_RO(_name) \
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struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name)
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#define MDEV_TYPE_ATTR_WO(_name) \
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struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name)
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/**
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* struct mdev_driver - Mediated device driver
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* @probe: called when new device created
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* @remove: called when device removed
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* @supported_type_groups: Attributes to define supported types. It is mandatory
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* to provide supported types.
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* @driver: device driver structure
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*
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**/
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struct mdev_driver {
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int (*probe)(struct mdev_device *dev);
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void (*remove)(struct mdev_device *dev);
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struct attribute_group **supported_type_groups;
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struct device_driver driver;
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};
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extern struct bus_type mdev_bus_type;
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int mdev_register_device(struct device *dev, struct mdev_driver *mdev_driver);
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void mdev_unregister_device(struct device *dev);
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int mdev_register_driver(struct mdev_driver *drv);
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void mdev_unregister_driver(struct mdev_driver *drv);
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struct device *mdev_parent_dev(struct mdev_device *mdev);
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static inline struct device *mdev_dev(struct mdev_device *mdev)
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{
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return &mdev->dev;
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}
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static inline struct mdev_device *mdev_from_dev(struct device *dev)
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{
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return dev->bus == &mdev_bus_type ? to_mdev_device(dev) : NULL;
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}
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#endif /* MDEV_H */
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