From: Russell Currey <ruscur@russell.cc>
To: Alexey Kardashevskiy <aik@ozlabs.ru>, linuxppc-dev@lists.ozlabs.org
Cc: David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH kernel] powerpc/ioda: Use ibm,supported-tce-sizes for IOMMU page size mask
Date: Thu, 03 May 2018 10:53:45 +1000 [thread overview]
Message-ID: <1525308825.2062.1.camel@russell.cc> (raw)
In-Reply-To: <20180502061239.36398-1-aik@ozlabs.ru>
On Wed, 2018-05-02 at 16:12 +1000, Alexey Kardashevskiy wrote:
> At the moment we assume that IODA2 and newer PHBs can always do
> 4K/64K/16M
> IOMMU pages, however this is not the case for POWER9 and now skiboot
> advertises the supported sizes via the device so we use that instead
> of hard coding the mask.
>
> This falls back to the default mask if no "ibm,supported-tce-sizes"
> is provided. This removes 16MB from the defaults as it is not
> supported
> everywhere; the downside of this is that hugepages backed POWER8
> guests
> will fall back to 64K IOMMU pages until skiboot is updated.
>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Russell Currey <ruscur@russell.cc>
prev parent reply other threads:[~2018-05-03 0:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-02 6:12 [PATCH kernel] powerpc/ioda: Use ibm, supported-tce-sizes for IOMMU page size mask Alexey Kardashevskiy
2018-05-02 13:12 ` Michael Ellerman
2018-05-03 0:53 ` Russell Currey [this message]
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