From: Christoph Hellwig <hch@infradead.org>
To: Oded Gabbay <oded.gabbay@gmail.com>
Cc: linuxppc-dev@ozlabs.org,
"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: Question - check in runtime which architecture am I running on
Date: Tue, 11 Jun 2019 07:07:25 -0700 [thread overview]
Message-ID: <20190611140725.GA28902@infradead.org> (raw)
In-Reply-To: <CAFCwf11EM9+NDML9hQmk9-rPzSmDmAyVLW+qOfs6h62dGK6H9A@mail.gmail.com>
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.
next prev parent reply other threads:[~2019-06-11 14:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-11 12:30 Question - check in runtime which architecture am I running on Oded Gabbay
2019-06-11 14:07 ` Christoph Hellwig [this message]
2019-06-11 17:21 ` Oded Gabbay
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190611140725.GA28902@infradead.org \
--to=hch@infradead.org \
--cc=gregkh@linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=oded.gabbay@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).