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A parent device might create different types of mediated
devices. For example, a mediated device could be created
by the parent device with full isolation and protection
provided by the IOMMU. One usage case could be found on
Intel platforms where a mediated device is an assignable
subset of a PCI, the DMA requests on behalf of it are all
tagged with a PASID. Since IOMMU supports PASID-granular
translations (scalable mode in VT-d 3.0), this mediated
device could be individually protected and isolated by an
IOMMU.
This patch adds a new member in the struct mdev_device to
indicate that the mediated device represented by mdev could
be isolated and protected by attaching a domain to a device
represented by mdev->iommu_device. It also adds a helper to
add or set the iommu device.
* mdev_device->iommu_device
- This, if set, indicates that the mediated device could
be fully isolated and protected by IOMMU via attaching
an iommu domain to this device. If empty, it indicates
using vendor defined isolation, hence bypass IOMMU.
* mdev_set/get_iommu_device(dev, iommu_device)
- Set or get the iommu device which represents this mdev
in IOMMU's device scope. Drivers don't need to set the
iommu device if it uses vendor defined isolation.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Suggested-by: Kevin Tian <kevin.tian@intel.com>
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
152 lines
5.4 KiB
C
152 lines
5.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef MDEV_H
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#define MDEV_H
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struct mdev_device;
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/*
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* Called by the parent device driver to set the device which represents
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* this mdev in iommu protection scope. By default, the iommu device is
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* NULL, that indicates using vendor defined isolation.
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*
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* @dev: the mediated device that iommu will isolate.
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* @iommu_device: a pci device which represents the iommu for @dev.
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*
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* Return 0 for success, otherwise negative error value.
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*/
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int mdev_set_iommu_device(struct device *dev, struct device *iommu_device);
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struct device *mdev_get_iommu_device(struct device *dev);
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/**
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* struct mdev_parent_ops - Structure to be registered for each parent device to
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* register the device to mdev module.
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*
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* @owner: The module owner.
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* @dev_attr_groups: Attributes of the parent device.
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* @mdev_attr_groups: Attributes of the mediated device.
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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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* @create: Called to allocate basic resources in parent device's
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* driver for a particular mediated device. It is
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* mandatory to provide create ops.
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* @kobj: kobject of type for which 'create' is called.
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* @mdev: mdev_device structure on of mediated device
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* that is being created
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* Returns integer: success (0) or error (< 0)
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* @remove: Called to free resources in parent device's driver for a
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* a mediated device. It is mandatory to provide 'remove'
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* ops.
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* @mdev: mdev_device device structure which is being
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* destroyed
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* Returns integer: success (0) or error (< 0)
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* @open: Open mediated device.
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* @mdev: mediated device.
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* Returns integer: success (0) or error (< 0)
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* @release: release mediated device
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* @mdev: mediated device.
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* @read: Read emulation callback
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* @mdev: mediated device structure
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* @buf: read buffer
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* @count: number of bytes to read
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* @ppos: address.
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* Retuns number on bytes read on success or error.
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* @write: Write emulation callback
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* @mdev: mediated device structure
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* @buf: write buffer
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* @count: number of bytes to be written
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* @ppos: address.
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* Retuns number on bytes written on success or error.
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* @ioctl: IOCTL callback
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* @mdev: mediated device structure
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* @cmd: ioctl command
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* @arg: arguments to ioctl
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* @mmap: mmap callback
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* @mdev: mediated device structure
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* @vma: vma structure
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* Parent device that support mediated device should be registered with mdev
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* module with mdev_parent_ops structure.
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**/
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struct mdev_parent_ops {
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struct module *owner;
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const struct attribute_group **dev_attr_groups;
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const struct attribute_group **mdev_attr_groups;
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struct attribute_group **supported_type_groups;
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int (*create)(struct kobject *kobj, struct mdev_device *mdev);
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int (*remove)(struct mdev_device *mdev);
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int (*open)(struct mdev_device *mdev);
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void (*release)(struct mdev_device *mdev);
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ssize_t (*read)(struct mdev_device *mdev, char __user *buf,
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size_t count, loff_t *ppos);
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ssize_t (*write)(struct mdev_device *mdev, const char __user *buf,
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size_t count, loff_t *ppos);
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long (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
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unsigned long arg);
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int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
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};
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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 kobject *kobj, struct device *dev, char *buf);
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ssize_t (*store)(struct kobject *kobj, struct device *dev,
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const char *buf, 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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* @name: driver name
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* @probe: called when new device created
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* @remove: called when device removed
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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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const char *name;
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int (*probe)(struct device *dev);
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void (*remove)(struct device *dev);
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struct device_driver driver;
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};
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#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
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extern void *mdev_get_drvdata(struct mdev_device *mdev);
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extern void mdev_set_drvdata(struct mdev_device *mdev, void *data);
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extern const guid_t *mdev_uuid(struct mdev_device *mdev);
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extern struct bus_type mdev_bus_type;
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extern int mdev_register_device(struct device *dev,
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const struct mdev_parent_ops *ops);
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extern void mdev_unregister_device(struct device *dev);
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extern int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
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extern void mdev_unregister_driver(struct mdev_driver *drv);
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extern struct device *mdev_parent_dev(struct mdev_device *mdev);
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extern struct device *mdev_dev(struct mdev_device *mdev);
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extern struct mdev_device *mdev_from_dev(struct device *dev);
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#endif /* MDEV_H */
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