Instead of hooking the general ioctl op, have the core code directly decode VFIO_DEVICE_GET_REGION_INFO and call an op just for it.
This is intended to allow mechanical changes to the drivers to pull their VFIO_DEVICE_GET_REGION_INFO int oa function. Later patches will improve the function signature to consolidate more code. Reviewed-by: Kevin Tian <[email protected]> Reviewed-by: Pranjal Shrivastava <[email protected]> Signed-off-by: Jason Gunthorpe <[email protected]> --- drivers/vfio/pci/vfio_pci_core.c | 9 ++++++--- drivers/vfio/vfio_main.c | 7 +++++++ include/linux/vfio.h | 2 ++ include/linux/vfio_pci_core.h | 2 ++ 4 files changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index 7dcf5439dedc9d..1dc350003f075c 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -996,9 +996,11 @@ static int vfio_pci_ioctl_get_info(struct vfio_pci_core_device *vdev, return copy_to_user(arg, &info, minsz) ? -EFAULT : 0; } -static int vfio_pci_ioctl_get_region_info(struct vfio_pci_core_device *vdev, - struct vfio_region_info __user *arg) +int vfio_pci_ioctl_get_region_info(struct vfio_device *core_vdev, + struct vfio_region_info __user *arg) { + struct vfio_pci_core_device *vdev = + container_of(core_vdev, struct vfio_pci_core_device, vdev); unsigned long minsz = offsetofend(struct vfio_region_info, offset); struct pci_dev *pdev = vdev->pdev; struct vfio_region_info info; @@ -1132,6 +1134,7 @@ static int vfio_pci_ioctl_get_region_info(struct vfio_pci_core_device *vdev, return copy_to_user(arg, &info, minsz) ? -EFAULT : 0; } +EXPORT_SYMBOL_GPL(vfio_pci_ioctl_get_region_info); static int vfio_pci_ioctl_get_irq_info(struct vfio_pci_core_device *vdev, struct vfio_irq_info __user *arg) @@ -1458,7 +1461,7 @@ long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd, case VFIO_DEVICE_GET_PCI_HOT_RESET_INFO: return vfio_pci_ioctl_get_pci_hot_reset_info(vdev, uarg); case VFIO_DEVICE_GET_REGION_INFO: - return vfio_pci_ioctl_get_region_info(vdev, uarg); + return vfio_pci_ioctl_get_region_info(core_vdev, uarg); case VFIO_DEVICE_IOEVENTFD: return vfio_pci_ioctl_ioeventfd(vdev, uarg); case VFIO_DEVICE_PCI_HOT_RESET: diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 38c8e9350a60ec..a390163ce706c4 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -1296,7 +1296,14 @@ static long vfio_device_fops_unl_ioctl(struct file *filep, ret = vfio_ioctl_device_feature(device, uptr); break; + case VFIO_DEVICE_GET_REGION_INFO: + if (!device->ops->get_region_info) + goto ioctl_fallback; + ret = device->ops->get_region_info(device, uptr); + break; + default: +ioctl_fallback: if (unlikely(!device->ops->ioctl)) ret = -EINVAL; else diff --git a/include/linux/vfio.h b/include/linux/vfio.h index eb563f538dee51..be5fcf8432e8d5 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -132,6 +132,8 @@ struct vfio_device_ops { size_t count, loff_t *size); long (*ioctl)(struct vfio_device *vdev, unsigned int cmd, unsigned long arg); + int (*get_region_info)(struct vfio_device *vdev, + struct vfio_region_info __user *arg); 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); diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h index f541044e42a2ad..160bc2e31ece75 100644 --- a/include/linux/vfio_pci_core.h +++ b/include/linux/vfio_pci_core.h @@ -115,6 +115,8 @@ long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd, unsigned long arg); int vfio_pci_core_ioctl_feature(struct vfio_device *device, u32 flags, void __user *arg, size_t argsz); +int vfio_pci_ioctl_get_region_info(struct vfio_device *core_vdev, + struct vfio_region_info __user *arg); ssize_t vfio_pci_core_read(struct vfio_device *core_vdev, char __user *buf, size_t count, loff_t *ppos); ssize_t vfio_pci_core_write(struct vfio_device *core_vdev, const char __user *buf, -- 2.43.0
