Add the ability for underlying device drivers to register the ioctl commands. This is useful when some interaction with the user space beyond sysfs capabilities is required, e.g. query the interrupt mode or bind eventfd to interrupt notifications (similarly to vfio ioctl VFIO_DEVICE_SET_IRQS).
Signed-off-by: Vlad Zolotarov <vl...@cloudius-systems.com> --- drivers/uio/uio.c | 15 +++++++++++++++ include/linux/uio_driver.h | 3 +++ 2 files changed, 18 insertions(+) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 8196581..714b0e5 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -704,6 +704,20 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma) } } +static long uio_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) +{ + struct uio_listener *listener = filep->private_data; + struct uio_device *idev = listener->dev; + + if (!idev->info) + return -EIO; + + if (!idev->info->ioctl) + return -ENOTTY; + + return idev->info->ioctl(idev->info, cmd, arg); +} + static const struct file_operations uio_fops = { .owner = THIS_MODULE, .open = uio_open, @@ -712,6 +726,7 @@ static const struct file_operations uio_fops = { .write = uio_write, .mmap = uio_mmap, .poll = uio_poll, + .unlocked_ioctl = uio_ioctl, .fasync = uio_fasync, .llseek = noop_llseek, }; diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h index 32c0e83..10d7833 100644 --- a/include/linux/uio_driver.h +++ b/include/linux/uio_driver.h @@ -89,6 +89,7 @@ struct uio_device { * @mmap: mmap operation for this uio device * @open: open operation for this uio device * @release: release operation for this uio device + * @ioctl: ioctl handler * @irqcontrol: disable/enable irqs when 0/1 is written to /dev/uioX */ struct uio_info { @@ -105,6 +106,8 @@ struct uio_info { int (*open)(struct uio_info *info, struct inode *inode); int (*release)(struct uio_info *info, struct inode *inode); int (*irqcontrol)(struct uio_info *info, s32 irq_on); + int (*ioctl)(struct uio_info *info, unsigned int cmd, + unsigned long arg); }; extern int __must_check -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/