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![Nicolin Chen](/assets/img/avatar_default.png)
Now both the physical path and the emulated path can support an IO page table replacement. Call iommufd_device_replace/iommufd_access_replace(), when vdev->iommufd_attached is true. Also update the VFIO_DEVICE_ATTACH_IOMMUFD_PT kdoc in the uAPI header. Link: https://lore.kernel.org/r/b5f01956ff161f76aa52c95b0fa1ad6eaca95c4a.1690523699.git.nicolinc@nvidia.com Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
247 lines
6 KiB
C
247 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
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*/
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#include <linux/vfio.h>
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#include <linux/iommufd.h>
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#include "vfio.h"
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MODULE_IMPORT_NS(IOMMUFD);
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MODULE_IMPORT_NS(IOMMUFD_VFIO);
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bool vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
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struct iommufd_ctx *ictx)
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{
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u32 ioas_id;
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return !iommufd_vfio_compat_ioas_get_id(ictx, &ioas_id);
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}
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int vfio_df_iommufd_bind(struct vfio_device_file *df)
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{
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struct vfio_device *vdev = df->device;
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struct iommufd_ctx *ictx = df->iommufd;
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lockdep_assert_held(&vdev->dev_set->lock);
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return vdev->ops->bind_iommufd(vdev, ictx, &df->devid);
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}
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int vfio_iommufd_compat_attach_ioas(struct vfio_device *vdev,
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struct iommufd_ctx *ictx)
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{
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u32 ioas_id;
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int ret;
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lockdep_assert_held(&vdev->dev_set->lock);
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/* compat noiommu does not need to do ioas attach */
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if (vfio_device_is_noiommu(vdev))
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return 0;
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ret = iommufd_vfio_compat_ioas_get_id(ictx, &ioas_id);
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if (ret)
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return ret;
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/* The legacy path has no way to return the selected pt_id */
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return vdev->ops->attach_ioas(vdev, &ioas_id);
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}
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void vfio_df_iommufd_unbind(struct vfio_device_file *df)
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{
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struct vfio_device *vdev = df->device;
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lockdep_assert_held(&vdev->dev_set->lock);
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if (vfio_device_is_noiommu(vdev))
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return;
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if (vdev->ops->unbind_iommufd)
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vdev->ops->unbind_iommufd(vdev);
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}
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struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev)
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{
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if (vdev->iommufd_device)
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return iommufd_device_to_ictx(vdev->iommufd_device);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_device_ictx);
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static int vfio_iommufd_device_id(struct vfio_device *vdev)
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{
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if (vdev->iommufd_device)
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return iommufd_device_to_id(vdev->iommufd_device);
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return -EINVAL;
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}
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/*
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* Return devid for a device.
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* valid ID for the device that is owned by the ictx
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* -ENOENT = device is owned but there is no ID
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* -ENODEV or other error = device is not owned
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*/
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int vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
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{
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struct iommu_group *group;
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int devid;
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if (vfio_iommufd_device_ictx(vdev) == ictx)
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return vfio_iommufd_device_id(vdev);
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group = iommu_group_get(vdev->dev);
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if (!group)
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return -ENODEV;
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if (iommufd_ctx_has_group(ictx, group))
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devid = -ENOENT;
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else
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devid = -ENODEV;
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iommu_group_put(group);
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return devid;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_get_dev_id);
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/*
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* The physical standard ops mean that the iommufd_device is bound to the
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* physical device vdev->dev that was provided to vfio_init_group_dev(). Drivers
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* using this ops set should call vfio_register_group_dev()
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*/
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int vfio_iommufd_physical_bind(struct vfio_device *vdev,
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struct iommufd_ctx *ictx, u32 *out_device_id)
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{
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struct iommufd_device *idev;
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idev = iommufd_device_bind(ictx, vdev->dev, out_device_id);
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if (IS_ERR(idev))
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return PTR_ERR(idev);
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vdev->iommufd_device = idev;
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return 0;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_physical_bind);
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void vfio_iommufd_physical_unbind(struct vfio_device *vdev)
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{
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lockdep_assert_held(&vdev->dev_set->lock);
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if (vdev->iommufd_attached) {
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iommufd_device_detach(vdev->iommufd_device);
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vdev->iommufd_attached = false;
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}
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iommufd_device_unbind(vdev->iommufd_device);
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vdev->iommufd_device = NULL;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_physical_unbind);
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int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
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{
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int rc;
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lockdep_assert_held(&vdev->dev_set->lock);
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if (WARN_ON(!vdev->iommufd_device))
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return -EINVAL;
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if (vdev->iommufd_attached)
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rc = iommufd_device_replace(vdev->iommufd_device, pt_id);
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else
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rc = iommufd_device_attach(vdev->iommufd_device, pt_id);
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if (rc)
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return rc;
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vdev->iommufd_attached = true;
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return 0;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_physical_attach_ioas);
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void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev)
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{
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lockdep_assert_held(&vdev->dev_set->lock);
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if (WARN_ON(!vdev->iommufd_device) || !vdev->iommufd_attached)
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return;
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iommufd_device_detach(vdev->iommufd_device);
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vdev->iommufd_attached = false;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_physical_detach_ioas);
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/*
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* The emulated standard ops mean that vfio_device is going to use the
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* "mdev path" and will call vfio_pin_pages()/vfio_dma_rw(). Drivers using this
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* ops set should call vfio_register_emulated_iommu_dev(). Drivers that do
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* not call vfio_pin_pages()/vfio_dma_rw() have no need to provide dma_unmap.
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*/
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static void vfio_emulated_unmap(void *data, unsigned long iova,
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unsigned long length)
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{
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struct vfio_device *vdev = data;
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if (vdev->ops->dma_unmap)
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vdev->ops->dma_unmap(vdev, iova, length);
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}
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static const struct iommufd_access_ops vfio_user_ops = {
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.needs_pin_pages = 1,
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.unmap = vfio_emulated_unmap,
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};
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int vfio_iommufd_emulated_bind(struct vfio_device *vdev,
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struct iommufd_ctx *ictx, u32 *out_device_id)
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{
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struct iommufd_access *user;
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lockdep_assert_held(&vdev->dev_set->lock);
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user = iommufd_access_create(ictx, &vfio_user_ops, vdev, out_device_id);
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if (IS_ERR(user))
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return PTR_ERR(user);
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vdev->iommufd_access = user;
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return 0;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_bind);
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void vfio_iommufd_emulated_unbind(struct vfio_device *vdev)
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{
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lockdep_assert_held(&vdev->dev_set->lock);
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if (vdev->iommufd_access) {
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iommufd_access_destroy(vdev->iommufd_access);
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vdev->iommufd_attached = false;
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vdev->iommufd_access = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_unbind);
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int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
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{
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int rc;
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lockdep_assert_held(&vdev->dev_set->lock);
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if (vdev->iommufd_attached)
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rc = iommufd_access_replace(vdev->iommufd_access, *pt_id);
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else
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rc = iommufd_access_attach(vdev->iommufd_access, *pt_id);
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if (rc)
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return rc;
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vdev->iommufd_attached = true;
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return 0;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_attach_ioas);
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void vfio_iommufd_emulated_detach_ioas(struct vfio_device *vdev)
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{
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lockdep_assert_held(&vdev->dev_set->lock);
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if (WARN_ON(!vdev->iommufd_access) ||
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!vdev->iommufd_attached)
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return;
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iommufd_access_detach(vdev->iommufd_access);
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vdev->iommufd_attached = false;
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}
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EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_detach_ioas);
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