Re: [PATCH] Extending kernel option pci=resource_alignment to be able to specify PCI device/vendor IDs

["gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>]

On Tue, Jun 07, 2016 at 02:24:17PM +0000, Koehrer Mathias (ETAS/ESW5) wrote:
> Some uio based PCI drivers (e.g. uio_cif) do not work if the assigned 
> PCI memory resources are not page aligned.
> By using the kernel option "pci=resource_alignment" it is possible to force
> single PCI boards to use page alignment for their memory resources.
> However, this is fairly cumbersome if multiple of these boards are in use as 
> the specification of the cards has to be done via PCI bus/slot/function number
> which might change e.g. by adding another board.
> This patch extends the kernel option "pci=resource_alignment" to allow to
> specify the relevant boards via PCI device/vendor (and subdevice/subvendor) ids.
> The specification of the devices via device/vendor is indicated by a leading
> string "pci:" as argument to "pci=resource_alignment".
> The format of the specification is
>   pci:<vendor>:<device>[:<subvendor>:<subdevice>]
> 
> Signed-off-by: Mathias Koehrer <mathias.koehrer@etas.com>
> 
> ---
>  Documentation/kernel-parameters.txt |    2 +
>  drivers/pci/pci.c                   |   66 +++++++++++++++++++++++++-----------
>  2 files changed, 49 insertions(+), 19 deletions(-)

This looks better, but wow, messy.  I'll defer to the PCI maintainer and
developers now, this is in their camp, not mine :)

thanks,

greg k-h