604 lines
14 KiB
C
604 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Physical device callbacks for vfio_ccw
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*
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* Copyright IBM Corp. 2017
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* Copyright Red Hat, Inc. 2019
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*
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* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
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* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
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* Cornelia Huck <cohuck@redhat.com>
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*/
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#include <linux/vfio.h>
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#include <linux/nospec.h>
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#include <linux/slab.h>
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#include "vfio_ccw_private.h"
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static const struct vfio_device_ops vfio_ccw_dev_ops;
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static int vfio_ccw_mdev_reset(struct vfio_ccw_private *private)
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{
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/*
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* If the FSM state is seen as Not Operational after closing
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* and re-opening the mdev, return an error.
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*/
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vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_CLOSE);
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vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_OPEN);
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if (private->state == VFIO_CCW_STATE_NOT_OPER)
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return -EINVAL;
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return 0;
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}
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static void vfio_ccw_dma_unmap(struct vfio_device *vdev, u64 iova, u64 length)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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/* Drivers MUST unpin pages in response to an invalidation. */
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if (!cp_iova_pinned(&private->cp, iova, length))
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return;
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vfio_ccw_mdev_reset(private);
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}
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static int vfio_ccw_mdev_init_dev(struct vfio_device *vdev)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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init_completion(&private->release_comp);
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return 0;
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}
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static int vfio_ccw_mdev_probe(struct mdev_device *mdev)
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{
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struct vfio_ccw_private *private = dev_get_drvdata(mdev->dev.parent);
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int ret;
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if (private->state == VFIO_CCW_STATE_NOT_OPER)
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return -ENODEV;
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ret = vfio_init_device(&private->vdev, &mdev->dev, &vfio_ccw_dev_ops);
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if (ret)
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return ret;
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VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: create\n",
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private->sch->schid.cssid,
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private->sch->schid.ssid,
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private->sch->schid.sch_no);
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ret = vfio_register_emulated_iommu_dev(&private->vdev);
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if (ret)
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goto err_put_vdev;
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dev_set_drvdata(&mdev->dev, private);
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return 0;
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err_put_vdev:
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vfio_put_device(&private->vdev);
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return ret;
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}
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static void vfio_ccw_mdev_release_dev(struct vfio_device *vdev)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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/*
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* We cannot free vfio_ccw_private here because it includes
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* parent info which must be free'ed by css driver.
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*
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* Use a workaround by memset'ing the core device part and
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* then notifying the remove path that all active references
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* to this device have been released.
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*/
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memset(vdev, 0, sizeof(*vdev));
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complete(&private->release_comp);
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}
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static void vfio_ccw_mdev_remove(struct mdev_device *mdev)
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{
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struct vfio_ccw_private *private = dev_get_drvdata(mdev->dev.parent);
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VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: remove\n",
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private->sch->schid.cssid,
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private->sch->schid.ssid,
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private->sch->schid.sch_no);
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vfio_unregister_group_dev(&private->vdev);
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vfio_put_device(&private->vdev);
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/*
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* Wait for all active references on mdev are released so it
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* is safe to defer kfree() to a later point.
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*
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* TODO: the clean fix is to split parent/mdev info from ccw
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* private structure so each can be managed in its own life
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* cycle.
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*/
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wait_for_completion(&private->release_comp);
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}
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static int vfio_ccw_mdev_open_device(struct vfio_device *vdev)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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int ret;
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/* Device cannot simply be opened again from this state */
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if (private->state == VFIO_CCW_STATE_NOT_OPER)
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return -EINVAL;
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ret = vfio_ccw_register_async_dev_regions(private);
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if (ret)
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return ret;
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ret = vfio_ccw_register_schib_dev_regions(private);
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if (ret)
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goto out_unregister;
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ret = vfio_ccw_register_crw_dev_regions(private);
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if (ret)
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goto out_unregister;
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vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_OPEN);
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if (private->state == VFIO_CCW_STATE_NOT_OPER) {
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ret = -EINVAL;
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goto out_unregister;
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}
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return ret;
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out_unregister:
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vfio_ccw_unregister_dev_regions(private);
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return ret;
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}
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static void vfio_ccw_mdev_close_device(struct vfio_device *vdev)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_CLOSE);
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vfio_ccw_unregister_dev_regions(private);
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}
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static ssize_t vfio_ccw_mdev_read_io_region(struct vfio_ccw_private *private,
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char __user *buf, size_t count,
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loff_t *ppos)
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{
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loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
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struct ccw_io_region *region;
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int ret;
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if (pos + count > sizeof(*region))
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return -EINVAL;
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mutex_lock(&private->io_mutex);
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region = private->io_region;
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if (copy_to_user(buf, (void *)region + pos, count))
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ret = -EFAULT;
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else
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ret = count;
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mutex_unlock(&private->io_mutex);
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return ret;
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}
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static ssize_t vfio_ccw_mdev_read(struct vfio_device *vdev,
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char __user *buf,
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size_t count,
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loff_t *ppos)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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unsigned int index = VFIO_CCW_OFFSET_TO_INDEX(*ppos);
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if (index >= VFIO_CCW_NUM_REGIONS + private->num_regions)
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return -EINVAL;
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switch (index) {
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case VFIO_CCW_CONFIG_REGION_INDEX:
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return vfio_ccw_mdev_read_io_region(private, buf, count, ppos);
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default:
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index -= VFIO_CCW_NUM_REGIONS;
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return private->region[index].ops->read(private, buf, count,
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ppos);
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}
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return -EINVAL;
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}
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static ssize_t vfio_ccw_mdev_write_io_region(struct vfio_ccw_private *private,
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const char __user *buf,
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size_t count, loff_t *ppos)
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{
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loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
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struct ccw_io_region *region;
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int ret;
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if (pos + count > sizeof(*region))
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return -EINVAL;
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if (!mutex_trylock(&private->io_mutex))
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return -EAGAIN;
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region = private->io_region;
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if (copy_from_user((void *)region + pos, buf, count)) {
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ret = -EFAULT;
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goto out_unlock;
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}
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vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_IO_REQ);
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ret = (region->ret_code != 0) ? region->ret_code : count;
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out_unlock:
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mutex_unlock(&private->io_mutex);
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return ret;
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}
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static ssize_t vfio_ccw_mdev_write(struct vfio_device *vdev,
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const char __user *buf,
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size_t count,
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loff_t *ppos)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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unsigned int index = VFIO_CCW_OFFSET_TO_INDEX(*ppos);
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if (index >= VFIO_CCW_NUM_REGIONS + private->num_regions)
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return -EINVAL;
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switch (index) {
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case VFIO_CCW_CONFIG_REGION_INDEX:
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return vfio_ccw_mdev_write_io_region(private, buf, count, ppos);
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default:
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index -= VFIO_CCW_NUM_REGIONS;
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return private->region[index].ops->write(private, buf, count,
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ppos);
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}
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return -EINVAL;
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}
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static int vfio_ccw_mdev_get_device_info(struct vfio_ccw_private *private,
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struct vfio_device_info *info)
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{
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info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET;
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info->num_regions = VFIO_CCW_NUM_REGIONS + private->num_regions;
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info->num_irqs = VFIO_CCW_NUM_IRQS;
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return 0;
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}
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static int vfio_ccw_mdev_get_region_info(struct vfio_ccw_private *private,
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struct vfio_region_info *info,
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unsigned long arg)
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{
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int i;
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switch (info->index) {
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case VFIO_CCW_CONFIG_REGION_INDEX:
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info->offset = 0;
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info->size = sizeof(struct ccw_io_region);
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info->flags = VFIO_REGION_INFO_FLAG_READ
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| VFIO_REGION_INFO_FLAG_WRITE;
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return 0;
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default: /* all other regions are handled via capability chain */
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{
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struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
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struct vfio_region_info_cap_type cap_type = {
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.header.id = VFIO_REGION_INFO_CAP_TYPE,
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.header.version = 1 };
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int ret;
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if (info->index >=
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VFIO_CCW_NUM_REGIONS + private->num_regions)
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return -EINVAL;
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info->index = array_index_nospec(info->index,
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VFIO_CCW_NUM_REGIONS +
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private->num_regions);
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i = info->index - VFIO_CCW_NUM_REGIONS;
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info->offset = VFIO_CCW_INDEX_TO_OFFSET(info->index);
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info->size = private->region[i].size;
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info->flags = private->region[i].flags;
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cap_type.type = private->region[i].type;
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cap_type.subtype = private->region[i].subtype;
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ret = vfio_info_add_capability(&caps, &cap_type.header,
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sizeof(cap_type));
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if (ret)
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return ret;
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info->flags |= VFIO_REGION_INFO_FLAG_CAPS;
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if (info->argsz < sizeof(*info) + caps.size) {
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info->argsz = sizeof(*info) + caps.size;
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info->cap_offset = 0;
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} else {
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vfio_info_cap_shift(&caps, sizeof(*info));
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if (copy_to_user((void __user *)arg + sizeof(*info),
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caps.buf, caps.size)) {
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kfree(caps.buf);
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return -EFAULT;
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}
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info->cap_offset = sizeof(*info);
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}
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kfree(caps.buf);
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}
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}
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return 0;
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}
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static int vfio_ccw_mdev_get_irq_info(struct vfio_irq_info *info)
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{
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switch (info->index) {
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case VFIO_CCW_IO_IRQ_INDEX:
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case VFIO_CCW_CRW_IRQ_INDEX:
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case VFIO_CCW_REQ_IRQ_INDEX:
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info->count = 1;
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info->flags = VFIO_IRQ_INFO_EVENTFD;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int vfio_ccw_mdev_set_irqs(struct vfio_ccw_private *private,
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uint32_t flags,
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uint32_t index,
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void __user *data)
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{
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struct eventfd_ctx **ctx;
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if (!(flags & VFIO_IRQ_SET_ACTION_TRIGGER))
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return -EINVAL;
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switch (index) {
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case VFIO_CCW_IO_IRQ_INDEX:
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ctx = &private->io_trigger;
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break;
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case VFIO_CCW_CRW_IRQ_INDEX:
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ctx = &private->crw_trigger;
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break;
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case VFIO_CCW_REQ_IRQ_INDEX:
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ctx = &private->req_trigger;
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break;
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default:
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return -EINVAL;
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}
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switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
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case VFIO_IRQ_SET_DATA_NONE:
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{
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if (*ctx)
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eventfd_signal(*ctx, 1);
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return 0;
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}
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case VFIO_IRQ_SET_DATA_BOOL:
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{
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uint8_t trigger;
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if (get_user(trigger, (uint8_t __user *)data))
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return -EFAULT;
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if (trigger && *ctx)
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eventfd_signal(*ctx, 1);
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return 0;
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}
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case VFIO_IRQ_SET_DATA_EVENTFD:
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{
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int32_t fd;
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if (get_user(fd, (int32_t __user *)data))
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return -EFAULT;
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if (fd == -1) {
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if (*ctx)
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eventfd_ctx_put(*ctx);
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*ctx = NULL;
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} else if (fd >= 0) {
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struct eventfd_ctx *efdctx;
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efdctx = eventfd_ctx_fdget(fd);
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if (IS_ERR(efdctx))
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return PTR_ERR(efdctx);
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if (*ctx)
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eventfd_ctx_put(*ctx);
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*ctx = efdctx;
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} else
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return -EINVAL;
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return 0;
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}
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default:
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return -EINVAL;
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}
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}
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int vfio_ccw_register_dev_region(struct vfio_ccw_private *private,
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unsigned int subtype,
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const struct vfio_ccw_regops *ops,
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size_t size, u32 flags, void *data)
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{
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struct vfio_ccw_region *region;
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region = krealloc(private->region,
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(private->num_regions + 1) * sizeof(*region),
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GFP_KERNEL);
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if (!region)
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return -ENOMEM;
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private->region = region;
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private->region[private->num_regions].type = VFIO_REGION_TYPE_CCW;
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private->region[private->num_regions].subtype = subtype;
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private->region[private->num_regions].ops = ops;
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private->region[private->num_regions].size = size;
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private->region[private->num_regions].flags = flags;
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private->region[private->num_regions].data = data;
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private->num_regions++;
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return 0;
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}
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void vfio_ccw_unregister_dev_regions(struct vfio_ccw_private *private)
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{
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int i;
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for (i = 0; i < private->num_regions; i++)
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private->region[i].ops->release(private, &private->region[i]);
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private->num_regions = 0;
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kfree(private->region);
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private->region = NULL;
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}
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static ssize_t vfio_ccw_mdev_ioctl(struct vfio_device *vdev,
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unsigned int cmd,
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unsigned long arg)
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{
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struct vfio_ccw_private *private =
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container_of(vdev, struct vfio_ccw_private, vdev);
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int ret = 0;
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unsigned long minsz;
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switch (cmd) {
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case VFIO_DEVICE_GET_INFO:
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{
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struct vfio_device_info info;
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minsz = offsetofend(struct vfio_device_info, num_irqs);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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ret = vfio_ccw_mdev_get_device_info(private, &info);
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if (ret)
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return ret;
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return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}
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case VFIO_DEVICE_GET_REGION_INFO:
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{
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struct vfio_region_info info;
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minsz = offsetofend(struct vfio_region_info, offset);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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ret = vfio_ccw_mdev_get_region_info(private, &info, arg);
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if (ret)
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return ret;
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return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}
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case VFIO_DEVICE_GET_IRQ_INFO:
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{
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struct vfio_irq_info info;
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minsz = offsetofend(struct vfio_irq_info, count);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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|
|
if (info.argsz < minsz || info.index >= VFIO_CCW_NUM_IRQS)
|
|
return -EINVAL;
|
|
|
|
ret = vfio_ccw_mdev_get_irq_info(&info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (info.count == -1)
|
|
return -EINVAL;
|
|
|
|
return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
|
|
}
|
|
case VFIO_DEVICE_SET_IRQS:
|
|
{
|
|
struct vfio_irq_set hdr;
|
|
size_t data_size;
|
|
void __user *data;
|
|
|
|
minsz = offsetofend(struct vfio_irq_set, count);
|
|
|
|
if (copy_from_user(&hdr, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
ret = vfio_set_irqs_validate_and_prepare(&hdr, 1,
|
|
VFIO_CCW_NUM_IRQS,
|
|
&data_size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
data = (void __user *)(arg + minsz);
|
|
return vfio_ccw_mdev_set_irqs(private, hdr.flags, hdr.index,
|
|
data);
|
|
}
|
|
case VFIO_DEVICE_RESET:
|
|
return vfio_ccw_mdev_reset(private);
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
/* Request removal of the device*/
|
|
static void vfio_ccw_mdev_request(struct vfio_device *vdev, unsigned int count)
|
|
{
|
|
struct vfio_ccw_private *private =
|
|
container_of(vdev, struct vfio_ccw_private, vdev);
|
|
struct device *dev = vdev->dev;
|
|
|
|
if (private->req_trigger) {
|
|
if (!(count % 10))
|
|
dev_notice_ratelimited(dev,
|
|
"Relaying device request to user (#%u)\n",
|
|
count);
|
|
|
|
eventfd_signal(private->req_trigger, 1);
|
|
} else if (count == 0) {
|
|
dev_notice(dev,
|
|
"No device request channel registered, blocked until released by user\n");
|
|
}
|
|
}
|
|
|
|
static const struct vfio_device_ops vfio_ccw_dev_ops = {
|
|
.init = vfio_ccw_mdev_init_dev,
|
|
.release = vfio_ccw_mdev_release_dev,
|
|
.open_device = vfio_ccw_mdev_open_device,
|
|
.close_device = vfio_ccw_mdev_close_device,
|
|
.read = vfio_ccw_mdev_read,
|
|
.write = vfio_ccw_mdev_write,
|
|
.ioctl = vfio_ccw_mdev_ioctl,
|
|
.request = vfio_ccw_mdev_request,
|
|
.dma_unmap = vfio_ccw_dma_unmap,
|
|
};
|
|
|
|
struct mdev_driver vfio_ccw_mdev_driver = {
|
|
.device_api = VFIO_DEVICE_API_CCW_STRING,
|
|
.max_instances = 1,
|
|
.driver = {
|
|
.name = "vfio_ccw_mdev",
|
|
.owner = THIS_MODULE,
|
|
.mod_name = KBUILD_MODNAME,
|
|
},
|
|
.probe = vfio_ccw_mdev_probe,
|
|
.remove = vfio_ccw_mdev_remove,
|
|
};
|