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Groups > linux.kernel > #1240765

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

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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);
+}
+
 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

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Thread

[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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