Re: Question - check in runtime which architecture am I running on

From: Oded Gabbay
Date: Tue Jun 11 2019 - 13:26:58 EST

On Tue, Jun 11, 2019 at 5:07 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> On Tue, Jun 11, 2019 at 03:30:08PM +0300, Oded Gabbay wrote:
> > Hello POWER developers,
> >
> > I'm trying to find out if there is an internal kernel API so that a
> > PCI driver can call it to check if its PCI device is running inside a
> > POWER9 machine. Alternatively, if that's not available, if it is
> > running on a machine with powerpc architecture.
> Your driver has absolutely not business knowing this.
> >
> > I need this information as my device (Goya AI accelerator)
> > unfortunately needs a slightly different configuration of its PCIe
> > controller in case of POWER9 (need to set bit 59 to be 1 in all
> > outbound transactions).
> No, it doesn't. You can query the output from dma_get_required_mask
> to optimize for the DMA addresses you get, and otherwise you simply
> set the maximum dma mask you support. That is about the control you
> get, and nothing else is a drivers business.

I don't want to conduct two discussions as I saw you answered on my patch.
I'll add the ppc mailing list to my patch.