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From: Christoph Hellwig <hch@lst.de>
To: Robin Murphy <robin.murphy@arm.com>
Cc: iommu@lists.linux-foundation.org, Christoph Hellwig <hch@lst.de>,
	David Rientjes <rientjes@google.com>
Subject: Re: [PATCH 04/11] dma-direct: clean up the remapping checks in dma_direct_alloc
Date: Tue, 7 Dec 2021 12:49:43 +0100	[thread overview]
Message-ID: <20211207114943.GB20713@lst.de> (raw)
In-Reply-To: <4f0109a6-8aea-185a-b73a-0b6e5ed1d514@arm.com>

On Mon, Dec 06, 2021 at 04:33:10PM +0000, Robin Murphy wrote:
> On 2021-11-11 06:50, Christoph Hellwig wrote:
>> Add two local variables to track if we want to remap the returned
>> address using vmap or call dma_set_uncached and use that to simplify
>> the code flow.
>
> I still wonder about the asymmetry between the remap and set_uncached cases 
> WRT the memset(), which stands out even more the further we clean things 
> up, but that's another matter.

The memset for the remap case obviously needs to be done after
remapping. OTOH for the set_uncached case the memset is much faste
when done on the cached mapping, which must be done before calling
arch_dma_set_uncached.
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  reply	other threads:[~2021-12-07 11:49 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-11  6:50 dma-direct fixes and cleanups v3 Christoph Hellwig
2021-11-11  6:50 ` [PATCH 01/11] dma-direct: factor out dma_set_{de,en}crypted helpers Christoph Hellwig
2021-11-11  6:50 ` [PATCH 02/11] dma-direct: don't call dma_set_decrypted for remapped allocations Christoph Hellwig
2021-11-11  6:50 ` [PATCH 03/11] dma-direct: always leak memory that can't be re-encrypted Christoph Hellwig
2021-12-06 16:32   ` Robin Murphy
2021-12-07 11:48     ` Christoph Hellwig
2021-11-11  6:50 ` [PATCH 04/11] dma-direct: clean up the remapping checks in dma_direct_alloc Christoph Hellwig
2021-12-06 16:33   ` Robin Murphy
2021-12-07 11:49     ` Christoph Hellwig [this message]
2021-12-07 12:43       ` Robin Murphy
2021-11-11  6:50 ` [PATCH 05/11] dma-direct: factor out a helper for DMA_ATTR_NO_KERNEL_MAPPING allocations Christoph Hellwig
2021-11-11  6:50 ` [PATCH 06/11] dma-direct: refactor the !coherent checks in dma_direct_alloc Christoph Hellwig
2021-12-06 16:33   ` Robin Murphy
2021-11-11  6:50 ` [PATCH 07/11] dma-direct: fail allocations that can't be made coherent Christoph Hellwig
2021-12-06 16:33   ` Robin Murphy
2021-11-11  6:50 ` [PATCH 08/11] dma-direct: warn if there is no pool for force unencrypted allocations Christoph Hellwig
2021-11-11  6:50 ` [PATCH 09/11] dma-direct: drop two CONFIG_DMA_RESTRICTED_POOL conditionals Christoph Hellwig
2021-11-11  6:50 ` [PATCH 10/11] dma-direct: factor the swiotlb code out of __dma_direct_alloc_pages Christoph Hellwig
2021-11-11  6:50 ` [PATCH 11/11] dma-direct: add a dma_direct_use_pool helper Christoph Hellwig
2021-12-08 15:44   ` Marek Szyprowski
2021-12-08 15:48     ` Christoph Hellwig
2021-11-16 11:31 ` dma-direct fixes and cleanups v3 Robin Murphy
2021-11-17  5:51   ` Christoph Hellwig

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