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Re: [PATCH v5 1/4] uio: add ioctl support

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On Wed, Oct 07, 2015 at 11:55:01AM +0300, Vlad Zolotarov wrote:
> 
> 
> On 10/07/15 11:46, Greg KH wrote:
> >On Tue, Oct 06, 2015 at 08:17:36PM +0300, Vlad Zolotarov wrote:
> >>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 <vladz@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);
> >>+}
> >As Stephen said, I will not take this, sorry.  It opens up the ability
> >to add "new system calls" to a huge range of crappy drivers, it's
> >something that vendors have been trying to push for years and is
> >something that I will not allow.
> 
> Ok. Another alternative could be to add new sysfs attributes for the MSI-X
> functionality similarly to what is done with "maps".
> Would it be acceptable?

If you get everyone else here to agree that this is the interface you
all are going to be using, sure.  All I care is that you not add ioctl
to the UIO interface.

greg k-h
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[PATCH v5 1/4] uio: add ioctl support Vlad Zolotarov <vladz@cloudius-systems.com> - 2015-10-06 19:20 +0200
  Re: [PATCH v5 1/4] uio: add ioctl support Stephen Hemminger <stephen@networkplumber.org> - 2015-10-06 23:40 +0200
    Re: [PATCH v5 1/4] uio: add ioctl support Vlad Zolotarov <vladz@cloudius-systems.com> - 2015-10-07 10:20 +0200
      Re: [PATCH v5 1/4] uio: add ioctl support Vlad Zolotarov <vladz@cloudius-systems.com> - 2015-10-07 10:20 +0200
  Re: [PATCH v5 1/4] uio: add ioctl support Greg KH <gregkh@linuxfoundation.org> - 2015-10-07 10:50 +0200
    Re: [PATCH v5 1/4] uio: add ioctl support Vlad Zolotarov <vladz@cloudius-systems.com> - 2015-10-07 11:00 +0200
      Re: [PATCH v5 1/4] uio: add ioctl support Greg KH <gregkh@linuxfoundation.org> - 2015-10-07 19:30 +0200
        Re: [PATCH v5 1/4] uio: add ioctl support Vlad Zolotarov <vladz@cloudius-systems.com> - 2015-10-07 19:30 +0200
          Re: [PATCH v5 1/4] uio: add ioctl support Vlad Zolotarov <vladz@cloudius-systems.com> - 2015-10-07 21:10 +0200
            Re: [PATCH v5 1/4] uio: add ioctl support Vlad Zolotarov <vladz@cloudius-systems.com> - 2015-10-08 14:50 +0200
              Re: [PATCH v5 1/4] uio: add ioctl support Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-08 17:40 +0200

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