> -----Original Message-----
> From: rlan...@gdrs.com [mailto:rlan...@gdrs.com]
> Sent: Thursday, August 16, 2012 8:45 PM
> To: gb.de...@gmail.com; Xiang, Haihao
> Cc: libva@lists.freedesktop.org
> Subject: RE: [Libva] using libva video compression on system with no monitor
>
> I agree with Gwenole.
> I verified that I am in the video group, and I changed the file mode and group
> of /dev/dri/card0 but it did not help.
>
> >>ls -l /dev/dri/card0
> crw-rw----+ 1 root video 226, 0 Aug 16 07:46 /dev/dri/card0
>
> I can only get this to work with "root" privileges.
The master fd is always authenticated in DRM
/* if there is no current master make this fd it */
mutex_lock(&dev->struct_mutex);
if (!priv->minor->master) {
/* create a new master */
priv->minor->master = drm_master_create(priv->minor);
if (!priv->minor->master) {
mutex_unlock(&dev->struct_mutex);
ret = -ENOMEM;
goto out_free;
}
priv->is_master = 1; <==== mark it as master
/* take another reference for the copy in the local file priv */
priv->master = drm_master_get(priv->minor->master);
priv->authenticated = 1; <==== authenticated
......
}
Is there any other process that is accessing /dev/dri/card0 before you run
VAAPI application ? If yes,
The opened fd=open("/dev/dri/card0", ...) in this VAAPI application isn't the
master fd.
In addition, ioctl DRM_IOCTL_AUTH_MAGIC doesn't need root privileges
(drmAuthMagic is the wrapper of ioctl(fd, DRM_IOCTL_AUTH_MAGIC, ...))
DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
As you see, DRM_ROOT_ONLY isn't needed although it is also authenticated for
root in DRM.
On the other hand, va_drm won't call drmAuthMagic() for the master fd because
va_drm_is_authenticated() returns true.
Thanks
Haihao
>
>
>
>
> -----Original Message-----
> From: Gwenole Beauchesne [mailto:gb.de...@gmail.com]
> Sent: Thursday, August 16, 2012 4:25 AM
> To: Xiang, Haihao
> Cc: Robert J. Landle; libva@lists.freedesktop.org
> Subject: Re: [Libva] using libva video compression on system with no monitor
>
> Hi,
>
> 2012/8/16 Xiang, Haihao <haihao.xi...@intel.com>:
>
> >> I see a comment in /va/drm/va_drm_auth.c
> >>
> >> /* Default: root + master privs are needed for the following call */
> >
> > Master is enough.
>
> Master requires "root" privileges.
>
> > That is because the permission is wrong for you. Usually the file mode
> > of /dev/dri/card0 is
> >
> > crw-rw---- 1 root video 226, 0 2012-08-16 08:55 /dev/dri/card0
> >
> > So either add the user into video group or change the file mode.
>
> The other condition is to *not* have any X server running, or that you provide
> a valid DISPLAY in that case.
>
> Regards,
> Gwenole.
>
> -------------------------------------------------------
> This is an e-mail from General Dynamics Robotic Systems. It is for the
> intended
> recipient only and may contain confidential and privileged information. No
> one else may read, print, store, copy, forward or act in reliance on it or its
> attachments. If you are not the intended recipient, please return this message
> to the sender and delete the message and any attachments from your
> computer. Your cooperation is appreciated.
_______________________________________________
Libva mailing list
Libva@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/libva
