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From: Robin Murphy <robin.murphy@arm.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Joerg Roedel <joro@8bytes.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 12/21] dma-iommu: factor atomic pool allocations into helpers
Date: Thu, 18 Apr 2019 16:06:56 +0100	[thread overview]
Message-ID: <83615173-a8b4-e0eb-bac3-1a58d61ea4ef@arm.com> (raw)
In-Reply-To: <20190417063358.GA24139@lst.de>

On 17/04/2019 07:33, Christoph Hellwig wrote:
> On Wed, Apr 10, 2019 at 08:11:57AM +0200, Christoph Hellwig wrote:
>> On Tue, Apr 09, 2019 at 06:59:32PM +0100, Robin Murphy wrote:
>>> On 27/03/2019 08:04, Christoph Hellwig wrote:
>>>> This keeps the code together and will simplify compiling the code
>>>> out on architectures that are always dma coherent.
>>>
>>> And this is where things take a turn in the direction I just can't get on
>>> with - I'm looking at the final result and the twisty maze of little
>>> disjoint helpers all overlapping each other in functionality is really
>>> difficult to follow. And I would *much* rather have things rely on
>>> compile-time constant optimisation than spend the future having to fix the
>>> #ifdefed parts for arm64 whenever x86-centric changes fail to test them.
>>
>> Can you draft up a patch on top of my series to show me what you
>> want?  I can take care of finishing it up and moving the changes
>> into the right patches in the series.
> 
> Any chance to make some progress on this?  Or at least a better
> description of what you want?

OK, I'm still looking at mmap and get_sgtable, but for now I've pushed 
out a partial branch that consolidates alloc and free in a way which 
makes sense to me:

   git://linux-arm.org/linux-rm  dma/rework

Please let me know what you think.

Robin.

  parent reply	other threads:[~2019-04-18 15:07 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-27  8:04 implement generic dma_map_ops for IOMMUs v2 [rebase + resend] Christoph Hellwig
2019-03-27  8:04 ` [PATCH 01/21] arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable Christoph Hellwig
2019-04-05 17:16   ` Robin Murphy
2019-03-27  8:04 ` [PATCH 02/21] arm64/iommu: improve mmap bounds checking Christoph Hellwig
2019-04-05 17:30   ` Robin Murphy
2019-04-07  6:59     ` Christoph Hellwig
2019-04-09 15:12       ` Robin Murphy
2019-04-09 17:09         ` Christoph Hellwig
2019-03-27  8:04 ` [PATCH 03/21] dma-mapping: add a Kconfig symbol to indicated arch_dma_prep_coherent presence Christoph Hellwig
2019-04-05 17:41   ` Robin Murphy
2019-03-27  8:04 ` [PATCH 04/21] dma-iommu: cleanup dma-iommu.h Christoph Hellwig
2019-04-05 17:42   ` Robin Murphy
2019-04-09 17:10     ` Christoph Hellwig
2019-03-27  8:04 ` [PATCH 05/21] dma-iommu: remove the flush_page callback Christoph Hellwig
2019-04-05 17:46   ` Robin Murphy
2019-03-27  8:04 ` [PATCH 06/21] dma-iommu: use for_each_sg in iommu_dma_alloc Christoph Hellwig
2019-04-05 18:08   ` Robin Murphy
2019-03-27  8:04 ` [PATCH 07/21] dma-iommu: move the arm64 wrappers to common code Christoph Hellwig
2019-04-09 15:07   ` Robin Murphy
2019-04-09 17:15     ` Christoph Hellwig
2019-04-09 17:23     ` Christoph Hellwig
2019-04-09 17:33       ` Robin Murphy
2019-03-27  8:04 ` [PATCH 08/21] dma-iommu: refactor iommu_dma_mmap Christoph Hellwig
2019-04-09 15:29   ` Robin Murphy
2019-04-09 17:25     ` Christoph Hellwig
2019-03-27  8:04 ` [PATCH 09/21] dma-iommu: refactor iommu_dma_get_sgtable Christoph Hellwig
2019-04-09 15:49   ` Robin Murphy
2019-04-09 17:26     ` Christoph Hellwig
2019-03-27  8:04 ` [PATCH 10/21] dma-iommu: move __iommu_dma_map Christoph Hellwig
2019-04-09 15:54   ` Robin Murphy
2019-03-27  8:04 ` [PATCH 11/21] dma-iommu: refactor page array remap helpers Christoph Hellwig
2019-04-09 16:38   ` Robin Murphy
2019-03-27  8:04 ` [PATCH 12/21] dma-iommu: factor atomic pool allocations into helpers Christoph Hellwig
2019-04-09 17:59   ` Robin Murphy
2019-04-10  6:11     ` Christoph Hellwig
2019-04-17  6:33       ` Christoph Hellwig
2019-04-17 11:54         ` Robin Murphy
2019-04-18 15:06         ` Robin Murphy [this message]
2019-04-18 16:35           ` Christoph Hellwig
2019-04-18 16:41             ` Robin Murphy
2019-04-19  9:07               ` Christoph Hellwig
2019-04-23  9:48                 ` Robin Murphy
2019-04-18 18:15             ` Robin Murphy
2019-04-19  8:23               ` Christoph Hellwig
2019-04-23 10:01                 ` Robin Murphy
2019-04-23 14:52                   ` Christoph Hellwig
2019-04-29 11:49                   ` Christoph Hellwig
2019-04-29 12:02                     ` Robin Murphy
2019-04-22 18:03               ` Christoph Hellwig
2019-03-27  8:04 ` [PATCH 13/21] dma-iommu: factor contiguous " Christoph Hellwig
2019-03-27  8:04 ` [PATCH 14/21] dma-iommu: refactor iommu_dma_free Christoph Hellwig
2019-03-27  8:04 ` [PATCH 15/21] dma-iommu: don't remap contiguous allocations for coherent devices Christoph Hellwig
2019-03-27  8:04 ` [PATCH 16/21] dma-iommu: factor contiguous remapped allocations into helpers Christoph Hellwig
2019-03-27  8:04 ` [PATCH 17/21] dma-iommu: refactor iommu_dma_alloc Christoph Hellwig
2019-03-27  8:04 ` [PATCH 18/21] dma-iommu: don't depend on CONFIG_DMA_DIRECT_REMAP Christoph Hellwig
2019-03-27  8:04 ` [PATCH 19/21] dma-iommu: switch copyright boilerplace to SPDX Christoph Hellwig
2019-03-27  8:04 ` [PATCH 20/21] arm64: switch copyright boilerplace to SPDX in dma-mapping.c Christoph Hellwig
2019-04-01  6:28   ` Mukesh Ojha
2019-04-01  9:39     ` Robin Murphy
2019-03-27  8:04 ` [PATCH 21/21] arm64: trim includes " Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2019-02-13 18:28 implement generic dma_map_ops for IOMMUs v2 Christoph Hellwig
2019-02-13 18:29 ` [PATCH 12/21] dma-iommu: factor atomic pool allocations into helpers Christoph Hellwig

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