Re: Add three new IOCTLs to FB API

[Kronos <kronos@kronoz.cjb.net>]

Il Mon, Sep 22, 2003 at 04:18:15PM -0700, Ian Romanick ha scritto: 
> >>2) Get 3D driver name. Return the name of the DRM driver that is 
> >>associated
> >>with this fb device. For example aty128fb would return r128, radeonfb 
> >>would
> >>return radeon. Empty string if there is none. There are eight DRM drivers 
> >>and
> >>15 fb ones.
> >
> >I think this should be done using sysfs, too. I.e. symbolic links between 
> >the
> >fbdev and drm drivers in /sys.
> 
> I'm not that familiar with how sysfs works.  How would this look? 
> There'd be a tree like:
> 
>     /sys/
>         card0/
Actually it will be /sys/graphics/fb0

>             dri.so (link to client-side driver)

Userspace  library? We  can  put  the   name  here,  not  a  symlink  to
the  library. sysfs  deals  only  with kobjects  (ie.  things that  live
somewhere in the  kernel). We can create link between  two kobjects (see
sysfs_create_link) but not between a kobject and something else.

>             DRM_device (link to DRM device that will load kernel module)

Do you mean device under /dev? Can't do that, see above. We can put
module name, so a user can do:
modprobe `cat /sys/graphics/fb0/drm_module`

>             PCI_INFO (file containing PCI device information)

Under /sys/graphics/fb0 there will be a "device" symlink. This will take
you to the device dir:
root@dreamland:/sys/bus/pci/devices/0000:01:00.0# ls
class  config  detach_state  device  irq  power/  resource subsystem_device  subsystem_vendor  vendor
root@dreamland:/sys/bus/pci/devices/0000:01:00.0# cat vendor device subsystem_vendor subsystem_device
0x1002
0x4e45
0x1681
0x0002

You can get everything from here without the need to add another
attribute.

Luca
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Reply-To: kronos@kronoz.cjb.net
Home: http://kronoz.cjb.net
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