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From: Christoph Hellwig <hch@lst.de>
To: Tomasz Figa <tfiga@chromium.org>
Cc: Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
alsa-devel@alsa-project.org, linux-ia64@vger.kernel.org,
Linux Doc Mailing List <linux-doc@vger.kernel.org>,
nouveau@lists.freedesktop.org, linux-nvme@lists.infradead.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
linux-mm@kvack.org, Marek Szyprowski <m.szyprowski@samsung.com>,
linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
Joonyoung Shim <jy0922.shim@samsung.com>,
linux-scsi@vger.kernel.org,
Kyungmin Park <kyungmin.park@samsung.com>,
Ben Skeggs <bskeggs@redhat.com>,
Matt Porter <mporter@kernel.crashing.org>,
Linux Media Mailing List <linux-media@vger.kernel.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
Pawel Osciak <pawel@osciak.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
"list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>,
"list@263.net:IOMMU DRIVERS <iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>,"
<linux-arm-kernel@lists.infradead.org>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
linux-parisc@vger.kernel.org, netdev@vger.kernel.org,
Seung-Woo Kim <sw0312.kim@samsung.com>,
linux-mips@vger.kernel.org
Subject: Re: [PATCH 05/28] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT
Date: Thu, 20 Aug 2020 06:52:01 +0200 [thread overview]
Message-ID: <20200820045201.GB4570@lst.de> (raw)
In-Reply-To: <CAAFQd5DrEq7UVi_aH=-DO4xYC3SbjJ3m1aQSbt=8THL-W+orMQ@mail.gmail.com>
On Wed, Aug 19, 2020 at 04:22:29PM +0200, Tomasz Figa wrote:
> > > FWIW, I asked back in time what the plan is for non-coherent
> > > allocations and it seemed like DMA_ATTR_NON_CONSISTENT and
> > > dma_sync_*() was supposed to be the right thing to go with. [2] The
> > > same thread also explains why dma_alloc_pages() isn't suitable for the
> > > users of dma_alloc_attrs() and DMA_ATTR_NON_CONSISTENT.
> >
> > AFAICS even back then Christoph was implying getting rid of
> > NON_CONSISTENT and *replacing* it with something streaming-API-based -
>
> That's not how I read his reply from the thread I pointed to, but that
> might of course be my misunderstanding.
Yes. Without changes like in this series just calling dma_sync_single_*
will break in various cases, e.g. because dma_alloc_attrs returns
memory remapped in the vmalloc space, and the dma_sync_single_*
implementation implementation can't cope with vmalloc addresses.
next prev parent reply other threads:[~2020-08-20 4:52 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200819065610eucas1p2fde88e81917071b1888e7cc01ba0f298@eucas1p2.samsung.com>
2020-08-19 6:55 ` a saner API for allocating DMA addressable pages Christoph Hellwig
2020-08-19 6:55 ` [PATCH 01/28] mm: turn alloc_pages into an inline function Christoph Hellwig
2020-08-19 6:55 ` [PATCH 02/28] drm/exynos: stop setting DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2020-08-19 6:55 ` [PATCH 03/28] drm/nouveau/gk20a: " Christoph Hellwig
2020-08-19 6:55 ` [PATCH 04/28] net/au1000-eth: stop using DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2020-08-19 6:55 ` [PATCH 05/28] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT Christoph Hellwig
2020-08-19 11:16 ` Tomasz Figa
2020-08-19 11:51 ` Robin Murphy
2020-08-19 12:49 ` Tomasz Figa
2020-08-19 13:57 ` Christoph Hellwig
2020-08-19 14:11 ` Tomasz Figa
2020-08-20 4:45 ` Christoph Hellwig
2020-08-20 10:09 ` Tomasz Figa
2020-08-20 16:51 ` Christoph Hellwig
2020-08-19 14:07 ` Robin Murphy
2020-08-19 14:22 ` Tomasz Figa
2020-08-20 4:52 ` Christoph Hellwig [this message]
2020-08-20 5:02 ` Christoph Hellwig
2020-08-20 10:24 ` Tomasz Figa
2020-08-20 16:52 ` Christoph Hellwig
2020-08-20 17:41 ` Tomasz Figa
2020-08-19 13:54 ` Christoph Hellwig
2020-08-19 13:57 ` Tomasz Figa
2020-08-20 4:43 ` Christoph Hellwig
2020-08-20 5:20 ` Christoph Hellwig
2020-08-20 10:05 ` Tomasz Figa
2020-08-20 16:54 ` Christoph Hellwig
2020-08-20 17:33 ` Tomasz Figa
2020-09-01 11:06 ` Christoph Hellwig
2020-09-01 15:02 ` Tomasz Figa
2020-08-19 6:55 ` [PATCH 06/28] lib82596: move DMA allocation into the callers of i82596_probe Christoph Hellwig
2020-09-01 13:29 ` Thomas Bogendoerfer
2020-08-19 6:55 ` [PATCH 07/28] 53c700: improve non-coherent DMA handling Christoph Hellwig
2020-09-01 14:52 ` James Bottomley
2020-09-01 15:05 ` Matthew Wilcox
2020-09-01 15:22 ` James Bottomley
2020-09-01 16:21 ` Helge Deller
2020-09-01 16:41 ` Helge Deller
2020-09-01 16:53 ` Matthew Wilcox
2020-09-02 15:00 ` Helge Deller
2020-08-19 6:55 ` [PATCH 08/28] MIPS: make dma_sync_*_for_cpu a little less overzealous Christoph Hellwig
2020-09-01 13:53 ` Thomas Bogendoerfer
2020-08-19 6:55 ` [PATCH 09/28] MIPS/jazzdma: remove the unused vdma_remap function Christoph Hellwig
2020-09-01 13:49 ` Thomas Bogendoerfer
2020-08-19 6:55 ` [PATCH 10/28] MIPS/jazzdma: decouple from dma-direct Christoph Hellwig
2020-09-01 13:49 ` Thomas Bogendoerfer
2020-08-19 6:55 ` [PATCH 11/28] dma-mapping: add (back) arch_dma_mark_clean for ia64 Christoph Hellwig
2020-08-19 6:55 ` [PATCH 12/28] dma-direct: remove dma_direct_{alloc,free}_pages Christoph Hellwig
2020-08-19 6:55 ` [PATCH 13/28] dma-direct: lift gfp_t manipulation out of__dma_direct_alloc_pages Christoph Hellwig
2020-08-19 6:55 ` [PATCH 14/28] dma-direct: use phys_to_dma_direct in dma_direct_alloc Christoph Hellwig
2020-08-19 6:55 ` [PATCH 15/28] dma-direct: remove __dma_to_phys Christoph Hellwig
2020-08-19 6:55 ` [PATCH 16/28] dma-direct: rename and cleanup __phys_to_dma Christoph Hellwig
2020-08-19 6:55 ` [PATCH 17/28] dma-mapping: move dma_common_{mmap,get_sgtable} out of mapping.c Christoph Hellwig
2020-08-19 6:55 ` [PATCH 18/28] dma-mapping: move the dma_declare_coherent_memory documentation Christoph Hellwig
2020-08-19 6:55 ` [PATCH 19/28] dma-mapping: replace DMA_ATTR_NON_CONSISTENT with dma_{alloc,free}_pages Christoph Hellwig
2020-08-19 15:03 ` [PATCH 19/28] dma-mapping: replace DMA_ATTR_NON_CONSISTENT with dma_{alloc, free}_pages Tomasz Figa
2020-08-20 5:15 ` Christoph Hellwig
2020-08-19 6:55 ` [PATCH 20/28] sgiwd93: convert from dma_cache_sync to dma_sync_single_for_device Christoph Hellwig
2020-08-19 6:55 ` [PATCH 21/28] hal2: " Christoph Hellwig
2020-08-19 6:55 ` [PATCH 22/28] sgiseeq: " Christoph Hellwig
2020-09-01 15:22 ` Thomas Bogendoerfer
2020-09-01 17:12 ` Thomas Bogendoerfer
2020-09-01 17:16 ` Christoph Hellwig
2020-09-01 17:38 ` Thomas Bogendoerfer
2020-09-02 21:38 ` Thomas Bogendoerfer
2020-09-03 8:42 ` Christoph Hellwig
2020-09-03 8:43 ` Christoph Hellwig
2020-09-03 8:46 ` Christoph Hellwig
2020-08-19 6:55 ` [PATCH 23/28] lib82596: " Christoph Hellwig
2020-08-19 6:55 ` [PATCH 24/28] 53c700: " Christoph Hellwig
2020-08-19 6:55 ` [PATCH 25/28] dma-mapping: remove dma_cache_sync Christoph Hellwig
2020-08-19 6:55 ` [PATCH 26/28] dmapool: add dma_alloc_pages support Christoph Hellwig
2020-08-19 6:55 ` [PATCH 27/28] nvme-pci: fix PRP pool size Christoph Hellwig
2020-08-19 6:55 ` [PATCH 28/28] nvme-pci: use dma_alloc_pages backed dmapools Christoph Hellwig
2020-08-25 11:30 ` a saner API for allocating DMA addressable pages Marek Szyprowski
2020-08-25 13:26 ` Christoph Hellwig
2020-08-29 9:46 ` Helge Deller
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