vdev->ops->unbind_iommufd(vdev);
}
+struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev)
+{
+ if (vdev->iommufd_device)
+ return iommufd_device_to_ictx(vdev->iommufd_device);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_device_ictx);
+
+static int vfio_iommufd_device_id(struct vfio_device *vdev)
+{
+ if (vdev->iommufd_device)
+ return iommufd_device_to_id(vdev->iommufd_device);
+ return -EINVAL;
+}
+
+/*
+ * Return devid for a device.
+ * valid ID for the device that is owned by the ictx
+ * -ENOENT = device is owned but there is no ID
+ * -ENODEV or other error = device is not owned
+ */
+int vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
+{
+ struct iommu_group *group;
+ int devid;
+
+ if (vfio_iommufd_device_ictx(vdev) == ictx)
+ return vfio_iommufd_device_id(vdev);
+
+ group = iommu_group_get(vdev->dev);
+ if (!group)
+ return -ENODEV;
+
+ if (iommufd_ctx_has_group(ictx, group))
+ devid = -ENOENT;
+ else
+ devid = -ENODEV;
+
+ iommu_group_put(group);
+
+ return devid;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_get_dev_id);
+
/*
* The physical standard ops mean that the iommufd_device is bound to the
* physical device vdev->dev that was provided to vfio_init_group_dev(). Drivers
#include <linux/vgaarb.h>
#include <linux/nospec.h>
#include <linux/sched/mm.h>
+#include <linux/iommufd.h>
#if IS_ENABLED(CONFIG_EEH)
#include <asm/eeh.h>
#endif
int max;
int cur;
struct vfio_pci_dependent_device *devices;
+ struct vfio_device *vdev;
+ u32 flags;
};
static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
{
struct vfio_pci_fill_info *fill = data;
- struct iommu_group *iommu_group;
if (fill->cur == fill->max)
return -EAGAIN; /* Something changed, try again */
- iommu_group = iommu_group_get(&pdev->dev);
- if (!iommu_group)
- return -EPERM; /* Cannot reset non-isolated devices */
+ if (fill->flags & VFIO_PCI_HOT_RESET_FLAG_DEV_ID) {
+ struct iommufd_ctx *iommufd = vfio_iommufd_device_ictx(fill->vdev);
+ struct vfio_device_set *dev_set = fill->vdev->dev_set;
+ struct vfio_device *vdev;
- fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
+ /*
+ * hot-reset requires all affected devices be represented in
+ * the dev_set.
+ */
+ vdev = vfio_find_device_in_devset(dev_set, &pdev->dev);
+ if (!vdev) {
+ fill->devices[fill->cur].devid = VFIO_PCI_DEVID_NOT_OWNED;
+ } else {
+ int id = vfio_iommufd_get_dev_id(vdev, iommufd);
+
+ if (id > 0)
+ fill->devices[fill->cur].devid = id;
+ else if (id == -ENOENT)
+ fill->devices[fill->cur].devid = VFIO_PCI_DEVID_OWNED;
+ else
+ fill->devices[fill->cur].devid = VFIO_PCI_DEVID_NOT_OWNED;
+ }
+ /* If devid is VFIO_PCI_DEVID_NOT_OWNED, clear owned flag. */
+ if (fill->devices[fill->cur].devid == VFIO_PCI_DEVID_NOT_OWNED)
+ fill->flags &= ~VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED;
+ } else {
+ struct iommu_group *iommu_group;
+
+ iommu_group = iommu_group_get(&pdev->dev);
+ if (!iommu_group)
+ return -EPERM; /* Cannot reset non-isolated devices */
+
+ fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
+ iommu_group_put(iommu_group);
+ }
fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
fill->devices[fill->cur].bus = pdev->bus->number;
fill->devices[fill->cur].devfn = pdev->devfn;
fill->cur++;
- iommu_group_put(iommu_group);
return 0;
}
return -ENOMEM;
fill.devices = devices;
+ fill.vdev = &vdev->vdev;
+ if (vfio_device_cdev_opened(&vdev->vdev))
+ fill.flags |= VFIO_PCI_HOT_RESET_FLAG_DEV_ID |
+ VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED;
+
+ mutex_lock(&vdev->vdev.dev_set->lock);
ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_fill_devs,
&fill, slot);
+ mutex_unlock(&vdev->vdev.dev_set->lock);
/*
* If a device was removed between counting and filling, we may come up
* short of fill.max. If a device was added, we'll have a return of
* -EAGAIN above.
*/
- if (!ret)
+ if (!ret) {
hdr.count = fill.cur;
+ hdr.flags = fill.flags;
+ }
reset_info_exit:
if (copy_to_user(arg, &hdr, minsz))
};
#if IS_ENABLED(CONFIG_IOMMUFD)
+struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev);
+int vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx);
int vfio_iommufd_physical_bind(struct vfio_device *vdev,
struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_physical_unbind(struct vfio_device *vdev);
void vfio_iommufd_emulated_unbind(struct vfio_device *vdev);
int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
#else
+static inline struct iommufd_ctx *
+vfio_iommufd_device_ictx(struct vfio_device *vdev)
+{
+ return NULL;
+}
+
+static inline int
+vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
+{
+ return VFIO_PCI_DEVID_NOT_OWNED;
+}
+
#define vfio_iommufd_physical_bind \
((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx, \
u32 *out_device_id)) NULL)
* VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 12,
* struct vfio_pci_hot_reset_info)
*
+ * This command is used to query the affected devices in the hot reset for
+ * a given device.
+ *
+ * This command always reports the segment, bus, and devfn information for
+ * each affected device, and selectively reports the group_id or devid per
+ * the way how the calling device is opened.
+ *
+ * - If the calling device is opened via the traditional group/container
+ * API, group_id is reported. User should check if it has owned all
+ * the affected devices and provides a set of group fds to prove the
+ * ownership in VFIO_DEVICE_PCI_HOT_RESET ioctl.
+ *
+ * - If the calling device is opened as a cdev, devid is reported.
+ * Flag VFIO_PCI_HOT_RESET_FLAG_DEV_ID is set to indicate this
+ * data type. All the affected devices should be represented in
+ * the dev_set, ex. bound to a vfio driver, and also be owned by
+ * this interface which is determined by the following conditions:
+ * 1) Has a valid devid within the iommufd_ctx of the calling device.
+ * Ownership cannot be determined across separate iommufd_ctx and
+ * the cdev calling conventions do not support a proof-of-ownership
+ * model as provided in the legacy group interface. In this case
+ * valid devid with value greater than zero is provided in the return
+ * structure.
+ * 2) Does not have a valid devid within the iommufd_ctx of the calling
+ * device, but belongs to the same IOMMU group as the calling device
+ * or another opened device that has a valid devid within the
+ * iommufd_ctx of the calling device. This provides implicit ownership
+ * for devices within the same DMA isolation context. In this case
+ * the devid value of VFIO_PCI_DEVID_OWNED is provided in the return
+ * structure.
+ *
+ * A devid value of VFIO_PCI_DEVID_NOT_OWNED is provided in the return
+ * structure for affected devices where device is NOT represented in the
+ * dev_set or ownership is not available. Such devices prevent the use
+ * of VFIO_DEVICE_PCI_HOT_RESET ioctl outside of the proof-of-ownership
+ * calling conventions (ie. via legacy group accessed devices). Flag
+ * VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED would be set when all the
+ * affected devices are represented in the dev_set and also owned by
+ * the user. This flag is available only when
+ * flag VFIO_PCI_HOT_RESET_FLAG_DEV_ID is set, otherwise reserved.
+ *
* Return: 0 on success, -errno on failure:
* -enospc = insufficient buffer, -enodev = unsupported for device.
*/
struct vfio_pci_dependent_device {
- __u32 group_id;
+ union {
+ __u32 group_id;
+ __u32 devid;
+#define VFIO_PCI_DEVID_OWNED 0
+#define VFIO_PCI_DEVID_NOT_OWNED -1
+ };
__u16 segment;
__u8 bus;
__u8 devfn; /* Use PCI_SLOT/PCI_FUNC */
struct vfio_pci_hot_reset_info {
__u32 argsz;
__u32 flags;
+#define VFIO_PCI_HOT_RESET_FLAG_DEV_ID (1 << 0)
+#define VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED (1 << 1)
__u32 count;
struct vfio_pci_dependent_device devices[];
};
projects / platform / kernel / linux-starfive.git / commitdiff