Re: Add three new IOCTLs to FB API

Il Mon, Sep 22, 2003 at 04:18:15PM -0700, Ian Romanick ha scritto: 

quoted

quoted

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
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