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vfio: Replace the DMA unmapping notifier with a callback

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Instead of having drivers register the notifier with explicit code just
have them provide a dma_unmap callback op in their driver ops and rely on
the core code to wire it up.

Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/1-v4-681e038e30fd+78-vfio_unmap_notif_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Jason Gunthorpe
2022-07-19 21:02:48 -03:00
committed by Alex Williamson
parent 2a8ed7ef00
commit ce4b4657ff
9 changed files with 86 additions and 240 deletions
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21
include/linux/vfio.h
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@@ -49,6 +49,7 @@ struct vfio_device {
unsigned int open_count;
struct completion comp;
struct list_head group_next;
struct notifier_block iommu_nb;
};
/**
@@ -65,6 +66,8 @@ struct vfio_device {
* @match: Optional device name match callback (return: 0 for no-match, >0 for
* match, -errno for abort (ex. match with insufficient or incorrect
* additional args)
* @dma_unmap: Called when userspace unmaps IOVA from the container
* this device is attached to.
* @device_feature: Optional, fill in the VFIO_DEVICE_FEATURE ioctl
*/
struct vfio_device_ops {
@@ -80,6 +83,7 @@ struct vfio_device_ops {
int (*mmap)(struct vfio_device *vdev, struct vm_area_struct *vma);
void (*request)(struct vfio_device *vdev, unsigned int count);
int (*match)(struct vfio_device *vdev, char *buf);
void (*dma_unmap)(struct vfio_device *vdev, u64 iova, u64 length);
int (*device_feature)(struct vfio_device *device, u32 flags,
void __user *arg, size_t argsz);
};
@@ -164,23 +168,6 @@ int vfio_unpin_pages(struct vfio_device *device, unsigned long *user_pfn,
int vfio_dma_rw(struct vfio_device *device, dma_addr_t user_iova,
void *data, size_t len, bool write);
/* each type has independent events */
enum vfio_notify_type {
VFIO_IOMMU_NOTIFY = 0,
};
/* events for VFIO_IOMMU_NOTIFY */
#define VFIO_IOMMU_NOTIFY_DMA_UNMAP BIT(0)
int vfio_register_notifier(struct vfio_device *device,
enum vfio_notify_type type,
unsigned long *required_events,
struct notifier_block *nb);
int vfio_unregister_notifier(struct vfio_device *device,
enum vfio_notify_type type,
struct notifier_block *nb);
/*
* Sub-module helpers
*/