[dpdk-dev] [PATCH 1/2] uio: add support for ioctls

[Stephen Hemminger]

Allow UIO device driver to provide ioctl interface.
This allow additional API's for UIO.

Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 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..5ab32ab 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -576,6 +576,20 @@ static ssize_t uio_write(struct file *filep, const char 
__user *buf,
        return retval ? retval : sizeof(s32);
 }

+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 int uio_find_mem_index(struct vm_area_struct *vma)
 {
        struct uio_device *idev = vma->vm_private_data;
@@ -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
-- 
2.1.4