svn commit: r223519 - head/etc/devd

Ronald Klop ronald-freebsd8 at klop.yi.org
Sun Jul 3 12:37:36 UTC 2011


On Tue, 28 Jun 2011 18:01:37 +0200, Warner Losh <imp at bsdimp.com> wrote:

>
> On Jun 28, 2011, at 2:45 AM, Alexey Dokuchaev wrote:
>
>> On Sun, Jun 26, 2011 at 10:14:13PM -0600, Warner Losh wrote:
>>> Not in GENERIC.  9.0 is getting ready to feature freeze any minute, so
>>> there's no time to do the testing that a radical change like that would
>>> require.
>>
>> Fair enough.  Right now, this work seems to cover only USB kernel  
>> modules,
>> is it so?  Is expansion into generic PCI area also planned, provided  
>> that
>> you've already had some ideas and seem to be willing to pick up the work
>> given enough support from the other developers (please excuse me if my
>> understanding is wrong)?
>
> The reason we were able to relatively quickly generate this file from  
> USB is because USB is very regular and uniform in its probe routines.   
> They all have (or could be converted to have) something approximating  
> the same format.
>
> PCI isn't even remotely close to this, and the techniques that worked  
> for USB (and some of the short cuts taken) can't work for PCI for us.   
> There's no uniformity in the PCI space, although many of the PCI drivers  
> use a similar design pattern.  They would all have to be converted to  
> using the same thing, which is kinda impractical at the moment (since  
> many have additional, driver specific fields).  While the tool is kinda  
> flexible enough to cope with this situation, more and more code winds up  
> in the tool to cope than is appropriate for the tool.
>
> That's why this feature is experimental.  For what it works for, it  
> works great.  For everything else, it is a lot of work to make it happy  
> on a wide-spread enough scale.  It is very instructive for how to  
> approach things, but embeds too much knowledge of the bus code into the  
> tool to generate these files than is appropriate (since it is duplicated  
> information from the driver, not exported from the bus/driver).
>
> Warner

Maybe something for a GSOC 2012 project?


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