On 2/19/07, Paul Mundt <[email protected]> wrote:
On Mon, Feb 19, 2007 at 11:13:04PM -0500, Jaya Kumar wrote:
>
> Ok. Here's what I'm thinking for abstracting this:
>
> fbdev drivers would setup fb_mmap with their own_mmap as usual. In
> own_mmap, they would do what they normally do and setup a vm_ops. They
> are free to have their own nopage handler but would set the
> page_mkwrite handler to be fbdev_deferred_io_mkwrite().
The vast majority of drivers do not implement ->fb_mmap(), and with
proper abstraction, this should be something that's possible as a direct
alternative to drivers/video/fbmem.c:fb_mmap() for the people that want
it. Of course it's just as easy to do something like the sbuslib.c route
and then have drivers set their ->fb_mmap() from that too.
I was thinking about having that fb_mmap replacement too. But then I
got worried because that generic implementation of nopage/etc would
need to handle whether the driver's fb memory was vmalloced, kmalloced
or a mixture if some do that. So I figured let's aim low and just pull
in the core part that does the setup and page tracking stuff. I hope
that's okay.
That works for me, though I'd prefer for struct page_list to be done with
a scatterlist, then it's trivial to setup from the workqueue context
without having to shuffle things around.
Ok. Will check out when implementing.
Thanks,
jaya
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
