Benjamin Herrenschmidt wrote:
> On Tue, 2006-02-21 at 13:10 -0800, Greg KH wrote:
>
>>On Tue, Feb 21, 2006 at 09:59:51PM +0100, Andi Kleen wrote:
>>
>>>On Tuesday 21 February 2006 21:56, Greg KH wrote:
>>>
>>>
>>>>I don't think you can add fields here, after the driver_data field. It
>>>>might mess up userspace tools a lot, as you are changing a userspace
>>>>api.
>>>
>>>User space should look at the ASCII files (modules.*), not the binary
>>>As long as the code to generate these files still works it should be ok.
>>
>>Does it? Shouldn't the tools export this information too, if it really
>>should belong in the pci_id structure?
>>
>>So, is _every_ pci driver going to have to be modified to support this
>>new field if they are supposed to work on this kind of hardware? If so,
>>that doesn't sound like a good idea. Any way we can just set the bit in
>>the pci arch specific code for the devices instead?
>
>
> I think the right approach is to not change driver_data but instead to
> add a new version of pci_enable_device() (I call it
> pci_enable_resources() but you are welcome to find something more fancy)
> to enable a selected set of resources with the old pci_enable_device()
> just calling the new one with a full mask set.
>
Using driver_data is one method to check if the device needs I/O
port or not. So whether to use driver_data depends on the design
of each driver.
> I don't like the driver_data approach. I don't like the static table
> approach in fact. Drivers may "know" wether they need to enable/disable
> given resources based on other things like revision, etc... Some drivers
> may want to enable only one BAR, access some registers to properly
> figure out what rev of a device they are talking to, then selectively
> enable other BARs and/or MSIs etc...
>
Exactly. I already mentioned about that in Documentation/pci.txt
in my second patch.
Thanks,
Kenji Kaneshige
-
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]