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

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Message-ID: <CAFCwf13WgnbxHe2wpb3mnw2PLWCgor=136_VSSPQCVodu17uvA@mail.gmail.com>
Date:   Tue, 11 Jun 2019 20:21:58 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linuxppc-dev@...abs.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: Question - check in runtime which architecture am I running on

On Tue, Jun 11, 2019 at 5:07 PM Christoph Hellwig <hch@...radead.org> 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.
Oded