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

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Message-ID: <CAFCwf11EM9+NDML9hQmk9-rPzSmDmAyVLW+qOfs6h62dGK6H9A@mail.gmail.com>
Date:   Tue, 11 Jun 2019 15:30:08 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linuxppc-dev@...abs.org
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Question - check in runtime which architecture am I running on

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.

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).

Currently I'm reading the PCI vendor and device ID of the parent PCI
bus device and checking if it is PHB4 but that is an ugly hack. (see
this commit - https://github.com/HabanaAI/linux/commit/1efd75ad5c9779b99a9a38c899e4e25e227626bf)

I dug through the code but didn't find anything that can help me so I
thought of asking more experienced people.

Thanks,
Oded