From: Vlastimil Babka <vbabka@suse.cz>
To: Nicolas Boichat <drinkcat@chromium.org>,
Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>, Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>,
Mel Gorman <mgorman@techsingularity.net>,
Levin Alexander <Alexander.Levin@microsoft.com>,
Huaisheng Ye <yehs1@lenovo.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
linux-arm-kernel@lists.infradead.org,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Yong Wu <yong.wu@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Tomasz Figa <tfiga@google.com>,
yingjoe.chen@mediatek.com, hch@infradead.org,
Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v5 2/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging
Date: Fri, 7 Dec 2018 16:01:06 +0100 [thread overview]
Message-ID: <78dfb949-ba3d-fd87-255e-65f142850b61@suse.cz> (raw)
In-Reply-To: <20181207061620.107881-3-drinkcat@chromium.org>
On 12/7/18 7:16 AM, Nicolas Boichat wrote:
> IOMMUs using ARMv7 short-descriptor format require page tables
> (level 1 and 2) to be allocated within the first 4GB of RAM, even
> on 64-bit systems.
>
> For level 1/2 pages, ensure GFP_DMA32 is used if CONFIG_ZONE_DMA32
> is defined (e.g. on arm64 platforms).
>
> For level 2 pages, allocate a slab cache in SLAB_CACHE_DMA32. Note
> that we do not explicitly pass GFP_DMA[32] to kmem_cache_zalloc,
> as this is not strictly necessary, and would cause a warning
> in mm/sl*b.c, as we did not update GFP_SLAB_BUG_MASK.
>
> Also, print an error when the physical address does not fit in
> 32-bit, to make debugging easier in the future.
>
> Fixes: ad67f5a6545f ("arm64: replace ZONE_DMA with ZONE_DMA32")
Also, CC stable?
> Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
next prev parent reply other threads:[~2018-12-07 15:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-07 6:16 [PATCH v5 0/3] iommu/io-pgtable-arm-v7s: Use DMA32 zone for page tables Nicolas Boichat
2018-12-07 6:16 ` [PATCH v5 1/3] mm: Add support for kmem caches in DMA32 zone Nicolas Boichat
2018-12-07 7:25 ` Vlastimil Babka
2018-12-07 6:16 ` [PATCH v5 2/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging Nicolas Boichat
2018-12-07 8:05 ` Matthew Wilcox
2018-12-07 8:48 ` Nicolas Boichat
2018-12-07 15:01 ` Vlastimil Babka [this message]
2018-12-07 6:16 ` [PATCH v5 3/3] mm: Add /sys/kernel/slab/cache/cache_dma32 Nicolas Boichat
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