mirror of
https://github.com/torvalds/linux.git
synced 2024-11-28 07:01:32 +00:00
34a255e676
Most of the callers of vfio_pin_pages() want "struct page *" and the low-level mm code to pin pages returns a list of "struct page *" too. So there's no gain in converting "struct page *" to PFN in between. Replace the output parameter "phys_pfn" list with a "pages" list, to simplify callers. This also allows us to replace the vfio_iommu_type1 implementation with a more efficient one. And drop the pfn_valid check in the gvt code, as there is no need to do such a check at a page-backed struct page pointer. For now, also update vfio_iommu_type1 to fit this new parameter too. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Eric Farman <farman@linux.ibm.com> Tested-by: Terrence Xu <terrence.xu@intel.com> Tested-by: Eric Farman <farman@linux.ibm.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Link: https://lore.kernel.org/r/20220723020256.30081-11-nicolinc@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
|
|
* Author: Alex Williamson <alex.williamson@redhat.com>
|
|
*/
|
|
|
|
enum vfio_group_type {
|
|
/*
|
|
* Physical device with IOMMU backing.
|
|
*/
|
|
VFIO_IOMMU,
|
|
|
|
/*
|
|
* Virtual device without IOMMU backing. The VFIO core fakes up an
|
|
* iommu_group as the iommu_group sysfs interface is part of the
|
|
* userspace ABI. The user of these devices must not be able to
|
|
* directly trigger unmediated DMA.
|
|
*/
|
|
VFIO_EMULATED_IOMMU,
|
|
|
|
/*
|
|
* Physical device without IOMMU backing. The VFIO core fakes up an
|
|
* iommu_group as the iommu_group sysfs interface is part of the
|
|
* userspace ABI. Users can trigger unmediated DMA by the device,
|
|
* usage is highly dangerous, requires an explicit opt-in and will
|
|
* taint the kernel.
|
|
*/
|
|
VFIO_NO_IOMMU,
|
|
};
|
|
|
|
/* events for the backend driver notify callback */
|
|
enum vfio_iommu_notify_type {
|
|
VFIO_IOMMU_CONTAINER_CLOSE = 0,
|
|
};
|
|
|
|
/**
|
|
* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
|
|
*/
|
|
struct vfio_iommu_driver_ops {
|
|
char *name;
|
|
struct module *owner;
|
|
void *(*open)(unsigned long arg);
|
|
void (*release)(void *iommu_data);
|
|
long (*ioctl)(void *iommu_data, unsigned int cmd,
|
|
unsigned long arg);
|
|
int (*attach_group)(void *iommu_data,
|
|
struct iommu_group *group,
|
|
enum vfio_group_type);
|
|
void (*detach_group)(void *iommu_data,
|
|
struct iommu_group *group);
|
|
int (*pin_pages)(void *iommu_data,
|
|
struct iommu_group *group,
|
|
dma_addr_t user_iova,
|
|
int npage, int prot,
|
|
struct page **pages);
|
|
void (*unpin_pages)(void *iommu_data,
|
|
dma_addr_t user_iova, int npage);
|
|
void (*register_device)(void *iommu_data,
|
|
struct vfio_device *vdev);
|
|
void (*unregister_device)(void *iommu_data,
|
|
struct vfio_device *vdev);
|
|
int (*dma_rw)(void *iommu_data, dma_addr_t user_iova,
|
|
void *data, size_t count, bool write);
|
|
struct iommu_domain *(*group_iommu_domain)(void *iommu_data,
|
|
struct iommu_group *group);
|
|
void (*notify)(void *iommu_data,
|
|
enum vfio_iommu_notify_type event);
|
|
};
|
|
|
|
int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
|
|
void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops);
|