On 03/28/2010 10:48 PM, Cam Macdonell wrote:
On Sat, Mar 27, 2010 at 11:48 AM, Avi Kivity<avi@xxxxxxxxxx> wrote:
On 03/26/2010 07:14 PM, Cam Macdonell wrote:
I'm not familiar with the uio internals, but for the interface, an
ioctl()
on the fd to assign an eventfd to an MSI vector. Similar to ioeventfd,
but
instead of mapping a doorbell to an eventfd, it maps a real MSI to an
eventfd.
uio will never support ioctls.
Why not?
Perhaps I spoke too strongly, but it was rejected before
http://thread.gmane.org/gmane.linux.kernel/756481
With a compelling case perhaps it could be added.
Ah, the usual "ioctls are ugly, go away".
It could be done via sysfs:
$ cat /sys/.../msix/max-interrupts
256
$ echo 4 > /sys/.../msix/allocate
$ # subdirectories 0 1 2 3 magically appear
$ # bind fd 13 to msix
$ echo 13 > /sys/.../msix/2/bind-fd
$ # from now on, msix interrupt 2 will call eventfd_signal() on fd 13
Call me old fashioned, but I prefer ioctls.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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