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From: Christoph Hellwig <hch@lst.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org, linux-ia64@vger.kernel.org,
	linux-parisc@vger.kernel.org,
	David Woodhouse <dwmw2@infradead.org>,
	the arch/x86 maintainers <x86@kernel.org>,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
	iommu@lists.linux-foundation.org, linux-alpha@vger.kernel.org,
	xen-devel@lists.xenproject.org, robin.murphy@arm.com,
	Christoph Hellwig <hch@lst.de>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: remove the ->mapping_error method from dma_map_ops V2
Date: Thu, 29 Nov 2018 19:31:32 +0100	[thread overview]
Message-ID: <20181129183132.GA30281__35672.8449384265$1543516263$gmane$org@lst.de> (raw)
In-Reply-To: <CAHk-=wi2K7_+dgCbc-sAK9CST5Zh+pOuH7sVT9WW-kqs50HSzQ@mail.gmail.com>

On Thu, Nov 29, 2018 at 09:44:05AM -0800, Linus Torvalds wrote:
> No. Really. If there's no iotlb, then you just mark that one page
> reserved. It simply doesn't get used. It doesn't mean you suddenly
> need a swiotlb.

Sure, we could just skip that page entirely based on dma_to_phys.

> But whatever. It's independent from the patch series under discussion.
> Make dma_mapping_error() at least return a real error (eg -EINVAL, or
> whatever is the common error), and we can maybe do this later.

Ok, I'll do that.

> Or, better yet, plan on removing the single-page dma mappign entirely
> at a later date, and make the issue moot.

What would be the replacement?  Build a S/G list for every single page
mapping?  Not sure that would create a lot of happy campers..

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  reply	other threads:[~2018-11-29 18:32 UTC|newest]

Thread overview: 343+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-22 14:02 remove the ->mapping_error method from dma_map_ops V2 Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` [PATCH 01/24] dma-direct: Make DIRECT_MAPPING_ERROR viable for SWIOTLB Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02 ` [PATCH 02/24] swiotlb: Skip cache maintenance on map error Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02 ` [PATCH 03/24] dma-mapping: provide a generic DMA_MAPPING_ERROR Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02   ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 04/24] dma-direct: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 05/24] arm: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 06/24] powerpc/iommu: " Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 07/24] mips/jazz: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 08/24] s390: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 09/24] sparc: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 10/24] parisc/ccio: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 11/24] parisc/sba_iommu: " Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 12/24] arm64: remove the dummy_dma_ops mapping_error method Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 13/24] alpha: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 14/24] ia64/sba_iommu: improve internal map_page users Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 15/24] ia64/sba_iommu: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 16/24] ia64/sn: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 17/24] x86/amd_gart: " Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 18/24] x86/calgary: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 19/24] iommu: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 20/24] iommu/intel: small map_page cleanup Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 21/24] iommu/vt-d: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 22/24] iommu/dma-iommu: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 23/24] xen-swiotlb: " Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 24/24] dma-mapping: " Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03   ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 16:50 ` remove the ->mapping_error method from dma_map_ops V2 Linus Torvalds
2018-11-22 16:50 ` Linus Torvalds
2018-11-22 16:50   ` Linus Torvalds
2018-11-22 16:50   ` Linus Torvalds
2018-11-22 17:07   ` Russell King - ARM Linux
2018-11-22 17:07   ` Russell King - ARM Linux
2018-11-22 17:07     ` Russell King - ARM Linux
2018-11-22 17:09     ` Linus Torvalds
2018-11-22 17:09     ` Linus Torvalds
2018-11-22 17:09       ` Linus Torvalds
2018-11-22 17:09       ` Linus Torvalds
2018-11-22 17:09       ` Linus Torvalds
2018-11-22 17:14       ` Russell King - ARM Linux
2018-11-22 17:14         ` Russell King - ARM Linux
2018-11-22 17:14       ` Russell King - ARM Linux
2018-11-22 17:52       ` Robin Murphy
2018-11-22 17:52       ` Robin Murphy
2018-11-22 17:52         ` Robin Murphy
2018-11-22 17:55         ` Linus Torvalds
2018-11-22 17:55         ` Linus Torvalds
2018-11-22 17:55           ` Linus Torvalds
2018-11-22 17:55           ` Linus Torvalds
2018-11-22 17:55           ` Linus Torvalds
2018-11-22 18:05           ` Russell King - ARM Linux
2018-11-22 18:05           ` Russell King - ARM Linux
2018-11-22 18:05             ` Russell King - ARM Linux
2018-11-23  6:57             ` Christoph Hellwig
2018-11-23  6:57               ` Christoph Hellwig
2018-11-23  6:57               ` Christoph Hellwig
2018-11-23  6:57               ` Christoph Hellwig
2018-11-23  6:57             ` Christoph Hellwig
2018-11-23  6:55           ` Christoph Hellwig
2018-11-23  6:55             ` Christoph Hellwig
2018-11-23  6:55             ` Christoph Hellwig
2018-11-23  6:55             ` Christoph Hellwig
2018-11-28  7:41             ` Christoph Hellwig
2018-11-28  7:41             ` Christoph Hellwig
2018-11-28  7:41               ` Christoph Hellwig
2018-11-28  7:41               ` Christoph Hellwig
2018-11-28 16:47               ` Linus Torvalds
2018-11-28 16:47               ` Linus Torvalds
2018-11-28 16:47                 ` Linus Torvalds
2018-11-28 16:47                 ` Linus Torvalds
2018-11-28 16:47                 ` Linus Torvalds
2018-11-28 17:45                 ` Russell King - ARM Linux
2018-11-28 17:45                   ` Russell King - ARM Linux
2018-11-28 18:00                   ` Linus Torvalds
2018-11-28 18:00                   ` Linus Torvalds
2018-11-28 18:00                     ` Linus Torvalds
2018-11-28 18:00                     ` Linus Torvalds
2018-11-28 18:08                     ` Russell King - ARM Linux
2018-11-28 18:08                       ` Russell King - ARM Linux
     [not found]                       ` <20181128180841.GM30658-l+eeeJia6m9URfEZ8mYm6t73F7V6hmMc@public.gmane.org>
2018-11-28 19:19                         ` Linus Torvalds
2018-11-28 19:31                           ` Russell King - ARM Linux
2018-11-28 19:31                           ` Russell King - ARM Linux
2018-11-28 19:31                             ` Russell King - ARM Linux
2018-11-29 16:23                           ` Christoph Hellwig
2018-11-29 16:23                           ` Christoph Hellwig
2018-11-29 16:23                             ` Christoph Hellwig
2018-11-29 16:23                             ` Christoph Hellwig
2018-11-29 17:44                             ` Linus Torvalds
2018-11-29 17:44                             ` Linus Torvalds
2018-11-29 17:44                               ` Linus Torvalds
2018-11-29 17:44                               ` Linus Torvalds
2018-11-29 18:31                               ` Christoph Hellwig [this message]
2018-11-29 18:31                               ` Christoph Hellwig
2018-11-29 18:31                                 ` Christoph Hellwig
2018-11-29 18:31                                 ` Christoph Hellwig
2018-11-29 18:53                                 ` Linus Torvalds
2018-11-29 18:53                                   ` Linus Torvalds
2018-11-29 18:53                                   ` Linus Torvalds
2018-11-29 18:55                                   ` Christoph Hellwig
2018-11-29 18:55                                     ` Christoph Hellwig
2018-11-29 18:55                                     ` Christoph Hellwig
2018-11-29 18:55                                   ` Christoph Hellwig
2018-11-29 18:53                                 ` Linus Torvalds
2018-11-28 19:19                       ` Linus Torvalds
2018-11-28 19:23                       ` Russell King - ARM Linux
2018-11-28 19:23                         ` Russell King - ARM Linux
2018-11-28 19:23                       ` Russell King - ARM Linux
2018-11-28 18:08                     ` Russell King - ARM Linux
2018-11-28 19:27                     ` David Miller
2018-11-28 19:27                       ` David Miller
2018-11-28 19:27                       ` David Miller
2018-11-28 19:47                       ` Russell King - ARM Linux
2018-11-28 19:47                         ` Russell King - ARM Linux
2018-11-28 23:01                         ` Shuah Khan
2018-11-28 23:01                           ` Shuah Khan
2018-11-28 23:01                           ` Shuah Khan
2018-11-28 23:01                           ` Shuah Khan
2018-11-28 23:01                         ` Shuah Khan
2018-11-28 19:47                       ` Russell King - ARM Linux
2018-11-28 19:27                     ` David Miller
2018-11-28 17:45                 ` Russell King - ARM Linux
2018-11-23  6:55           ` Christoph Hellwig
2018-11-23 10:49         ` Joerg Roedel
2018-11-23 10:49           ` Joerg Roedel
2018-11-23 10:49           ` Joerg Roedel
2018-11-23 11:01           ` Russell King - ARM Linux
2018-11-23 11:01             ` Russell King - ARM Linux
2018-11-23 13:03             ` Joerg Roedel
2018-11-23 13:03               ` Joerg Roedel
2018-11-23 13:03               ` Joerg Roedel
2018-11-23 13:20               ` Russell King - ARM Linux
2018-11-23 13:20                 ` Russell King - ARM Linux
2018-11-23 13:20                 ` Russell King - ARM Linux
2018-11-23 13:20               ` Russell King - ARM Linux
2018-11-23 13:03             ` Joerg Roedel
2018-11-23 11:01           ` Russell King - ARM Linux
2018-11-23 10:49         ` Joerg Roedel
2018-11-22 14:02 Christoph Hellwig
2018-11-30 13:22 remove the ->mapping_error method from dma_map_ops V3 Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 01/23] dma-mapping: provide a generic DMA_MAPPING_ERROR Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-12-04 16:41   ` Robin Murphy
2018-12-04 16:41     ` Robin Murphy
2018-12-04 16:41     ` Robin Murphy
2018-12-04 22:33     ` Christoph Hellwig
2018-12-04 22:33       ` Christoph Hellwig
2018-12-04 22:33       ` Christoph Hellwig
2018-12-04 22:33     ` Christoph Hellwig
2018-12-04 16:41   ` Robin Murphy
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 02/23] dma-direct: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 03/23] arm: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 04/23] powerpc/iommu: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 05/23] mips/jazz: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 06/23] s390: " Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 07/23] sparc: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 08/23] parisc/ccio: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 09/23] parisc/sba_iommu: " Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 10/23] arm64: remove the dummy_dma_ops mapping_error method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 11/23] alpha: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 12/23] ia64/sba_iommu: improve internal map_page users Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 13/23] ia64/sba_iommu: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 14/23] ia64/sn: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 15/23] x86/amd_gart: " Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 16/23] x86/calgary: " Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 17/23] iommu: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 18/23] iommu/intel: small map_page cleanup Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 19/23] iommu/vt-d: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 20/23] iommu/dma-iommu: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 21/23] xen-swiotlb: " Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-12-02 12:42   ` Konrad Rzeszutek Wilk
2018-12-02 12:42   ` Konrad Rzeszutek Wilk
2018-12-02 12:42     ` Konrad Rzeszutek Wilk
2018-12-02 12:42     ` Konrad Rzeszutek Wilk
2018-12-02 12:42     ` Konrad Rzeszutek Wilk
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 22/23] dma-mapping: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 23/23] dma-mapping: return an error code from dma_mapping_error Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 13:22   ` Christoph Hellwig
2018-11-30 18:59 ` remove the ->mapping_error method from dma_map_ops V3 Russell King - ARM Linux
2018-11-30 18:59   ` Russell King - ARM Linux
2018-11-30 18:59 ` Russell King - ARM Linux
2018-11-30 19:43 ` Linus Torvalds
2018-11-30 19:43 ` Linus Torvalds
2018-11-30 19:43   ` Linus Torvalds
2018-11-30 19:43   ` Linus Torvalds
2018-12-03 17:27 ` Christoph Hellwig
2018-12-03 17:27   ` Christoph Hellwig
2018-12-03 17:27   ` Christoph Hellwig
2018-12-03 17:27 ` Christoph Hellwig
2018-12-06 14:57 ` Christoph Hellwig
2018-12-06 14:57 ` Christoph Hellwig
2018-12-06 14:57   ` Christoph Hellwig
2018-12-06 14:57   ` Christoph Hellwig

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