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From: Catalin Marinas <catalin.marinas@arm.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Will Deacon <will.deacon@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 08/10] swiotlb: don't dip into swiotlb pool for coherent allocations
Date: Fri, 12 Oct 2018 18:04:56 +0100	[thread overview]
Message-ID: <20181012170456.GC60150@arrakis.emea.arm.com> (raw)
In-Reply-To: <20181008080246.20543-9-hch@lst.de>

On Mon, Oct 08, 2018 at 10:02:44AM +0200, Christoph Hellwig wrote:
> All architectures that support swiotlb also have a zone that backs up
> these less than full addressing allocations (usually ZONE_DMA32).
> 
> Because of that it is rather pointless to fall back to the global swiotlb
> buffer if the normal dma direct allocation failed - the only thing this
> will do is to eat up bounce buffers that would be more useful to serve
> streaming mappings.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  arch/arm64/mm/dma-mapping.c |   6 +--
>  include/linux/swiotlb.h     |   5 --
>  kernel/dma/swiotlb.c        | 105 +-----------------------------------
>  3 files changed, 5 insertions(+), 111 deletions(-)

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

  reply	other threads:[~2018-10-12 17:05 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-08  8:02 move swiotlb noncoherent dma support from arm64 to generic code V2 Christoph Hellwig
2018-10-08  8:02 ` [PATCH 01/10] swiotlb: remove a pointless comment Christoph Hellwig
2018-10-11 17:49   ` Robin Murphy
2018-10-19  0:09   ` Konrad Rzeszutek Wilk
2018-10-08  8:02 ` [PATCH 02/10] swiotlb: mark is_swiotlb_buffer static Christoph Hellwig
2018-10-11 17:54   ` Robin Murphy
2018-10-19  0:12   ` Konrad Rzeszutek Wilk
2018-10-08  8:02 ` [PATCH 03/10] swiotlb: do not panic on mapping failures Christoph Hellwig
2018-10-11 18:06   ` Robin Murphy
2018-10-19  0:18     ` Konrad Rzeszutek Wilk
2018-10-19  0:17   ` Konrad Rzeszutek Wilk
2018-10-19  6:04     ` Christoph Hellwig
2018-10-19 13:45       ` Konrad Rzeszutek Wilk
2018-10-08  8:02 ` [PATCH 04/10] swiotlb: remove the overflow buffer Christoph Hellwig
2018-10-11 18:19   ` Robin Murphy
2018-10-12 17:04   ` Catalin Marinas
2018-10-19  0:23   ` Konrad Rzeszutek Wilk
2018-10-08  8:02 ` [PATCH 05/10] swiotlb: merge swiotlb_unmap_page and unmap_single Christoph Hellwig
2018-10-18 17:44   ` Robin Murphy
2018-10-19  0:25   ` Konrad Rzeszutek Wilk
2018-10-08  8:02 ` [PATCH 06/10] swiotlb: use swiotlb_map_page in swiotlb_map_sg_attrs Christoph Hellwig
2018-10-18 17:53   ` Robin Murphy
2018-10-19  0:33   ` Konrad Rzeszutek Wilk
2018-11-07  1:27   ` John Stultz
2018-11-09  7:49     ` Christoph Hellwig
2018-11-09 16:37       ` Robin Murphy
2018-11-19 19:36         ` Robin Murphy
2018-11-20  9:22           ` Christoph Hellwig
2018-11-13  0:07       ` John Stultz
2018-11-13  0:26         ` John Stultz
2018-11-14 14:13         ` Christoph Hellwig
2018-11-14 16:12           ` Christoph Hellwig
2018-11-19 23:22             ` John Stultz
2018-11-20  9:25               ` Christoph Hellwig
2018-11-23 18:27                 ` Will Deacon
2018-11-23 19:34                   ` Robin Murphy
2018-11-26 19:31                     ` Will Deacon
2018-10-08  8:02 ` [PATCH 07/10] swiotlb: refactor swiotlb_map_page Christoph Hellwig
2018-10-18 18:09   ` Robin Murphy
2018-10-19  0:37     ` Konrad Rzeszutek Wilk
2018-10-19  6:52       ` Christoph Hellwig
2018-10-19 13:46         ` Konrad Rzeszutek Wilk
2018-10-08  8:02 ` [PATCH 08/10] swiotlb: don't dip into swiotlb pool for coherent allocations Christoph Hellwig
2018-10-12 17:04   ` Catalin Marinas [this message]
2018-10-19  0:40   ` Konrad Rzeszutek Wilk
2018-10-19 16:45   ` Robin Murphy
2018-10-08  8:02 ` [PATCH 09/10] swiotlb: add support for non-coherent DMA Christoph Hellwig
2018-10-19  0:49   ` Konrad Rzeszutek Wilk
2018-10-22 17:11   ` Robin Murphy
2018-10-26  8:04     ` Christoph Hellwig
2018-10-26  9:59       ` Robin Murphy
2018-10-08  8:02 ` [PATCH 10/10] arm64: use the generic swiotlb_dma_ops Christoph Hellwig
2018-10-12 13:01   ` Robin Murphy
2018-10-12 14:40     ` Christoph Hellwig
2018-10-12 17:05       ` Catalin Marinas
2018-10-22 17:52   ` Robin Murphy
2018-10-26 12:44     ` Christoph Hellwig

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