From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Mike Rapoport <rppt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Darren Stevens <darren-YHtdit1eIT3easaKlIn9Lw@public.gmane.org>,
Benjamin Herrenschmidt
<benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Mike Rapoport <rppt-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>,
mad skateman
<madskateman-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Christian Zigotzky
<chzigotzky-KCoaydhb8eAb1SvskN2V4Q@public.gmane.org>,
linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
Nicolas Saenz Julienne
<nsaenzjulienne-l3A5Bk7waGM@public.gmane.org>,
Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [PATCH] powerpc: ensure that swiotlb buffer is allocated from low memory
Date: Wed, 4 Dec 2019 14:56:32 +0100 [thread overview]
Message-ID: <20191204135632.GA31262@lst.de> (raw)
In-Reply-To: <20191204123524.22919-1-rppt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
On Wed, Dec 04, 2019 at 02:35:24PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org>
>
> Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G. If a
> system has more physical memory than this limit, the swiotlb buffer is not
> addressable because it is allocated from memblock using top-down mode.
>
> Force memblock to bottom-up mode before calling swiotlb_init() to ensure
> that the swiotlb buffer is DMA-able.
>
> Link: https://lkml.kernel.org/r/F1EBB706-73DF-430E-9020-C214EC8ED5DA-KCoaydhb8eAb1SvskN2V4Q@public.gmane.org
> Reported-by: Christian Zigotzky <chzigotzky-KCoaydhb8eAb1SvskN2V4Q@public.gmane.org>
> Signed-off-by: Mike Rapoport <rppt-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org>
Looks good:
Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Mike Rapoport <rppt@kernel.org>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
iommu@lists.linux-foundation.org,
Mike Rapoport <rppt@linux.ibm.com>,
Christian Zigotzky <chzigotzky@xenosoft.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christoph Hellwig <hch@lst.de>,
Darren Stevens <darren@stevens-zone.net>,
mad skateman <madskateman@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Paul Mackerras <paulus@samba.org>,
Robin Murphy <robin.murphy@arm.com>,
Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH] powerpc: ensure that swiotlb buffer is allocated from low memory
Date: Wed, 4 Dec 2019 14:56:32 +0100 [thread overview]
Message-ID: <20191204135632.GA31262@lst.de> (raw)
Message-ID: <20191204135632.U2I8bDW5Ye8CwNFtZLcL7fhP2-JVo3BfEScPJMoKhic@z> (raw)
In-Reply-To: <20191204123524.22919-1-rppt@kernel.org>
On Wed, Dec 04, 2019 at 02:35:24PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G. If a
> system has more physical memory than this limit, the swiotlb buffer is not
> addressable because it is allocated from memblock using top-down mode.
>
> Force memblock to bottom-up mode before calling swiotlb_init() to ensure
> that the swiotlb buffer is DMA-able.
>
> Link: https://lkml.kernel.org/r/F1EBB706-73DF-430E-9020-C214EC8ED5DA@xenosoft.de
> Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Looks good:
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2019-12-04 13:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-04 12:35 [PATCH] powerpc: ensure that swiotlb buffer is allocated from low memory Mike Rapoport
2019-12-04 12:35 ` Mike Rapoport
[not found] ` <20191204123524.22919-1-rppt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-12-04 13:56 ` Christoph Hellwig [this message]
2019-12-04 13:56 ` Christoph Hellwig
2019-12-09 5:43 ` Michael Ellerman
2019-12-09 5:43 ` Michael Ellerman
2019-12-09 7:54 ` Mike Rapoport
2019-12-09 7:54 ` Mike Rapoport
2019-12-18 4:05 ` Michael Ellerman
2019-12-18 4:05 ` Michael Ellerman
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