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From: Christoph Hellwig <hch@lst.de>
To: Mike Rapoport <rppt@kernel.org>
Cc: linux-arch@vger.kernel.org,
	Darren Stevens <darren@stevens-zone.net>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	linux-kernel@vger.kernel.org, Mike Rapoport <rppt@linux.ibm.com>,
	linux-mm@kvack.org, iommu@lists.linux-foundation.org,
	Rob Herring <robh+dt@kernel.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	mad skateman <madskateman@gmail.com>,
	Christian Zigotzky <chzigotzky@xenosoft.de>,
	linuxppc-dev@lists.ozlabs.org, Christoph Hellwig <hch@lst.de>,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
	Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH] powerpc: ensure that swiotlb buffer is allocated from low memory
Date: Wed, 4 Dec 2019 14:56:32 +0100
Message-ID: <20191204135632.GA31262@lst.de> (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>
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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 12:35 Mike Rapoport
2019-12-04 13:56 ` Christoph Hellwig [this message]
2019-12-09  5:43 ` Michael Ellerman
2019-12-09  7:54   ` Mike Rapoport

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