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* a saner API for allocating DMA addressable pages v3
@ 2020-09-15 15:51 Christoph Hellwig
  2020-09-15 15:51 ` [PATCH 01/18] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT flag Christoph Hellwig
                   ` (19 more replies)
  0 siblings, 20 replies; 36+ messages in thread
From: Christoph Hellwig @ 2020-09-15 15:51 UTC (permalink / raw)
  To: Mauro Carvalho Chehab, Thomas Bogendoerfer, James E.J. Bottomley,
	Joonyoung Shim, Seung-Woo Kim, Ben Skeggs, Marek Szyprowski,
	Tomasz Figa, Matt Porter, iommu
  Cc: alsa-devel, linux-samsung-soc, linux-scsi, linux-parisc,
	linux-doc, nouveau, linux-kernel, linux-mips, linux-mm,
	Stefan Richter, netdev, linux1394-devel, linux-arm-kernel,
	linux-media

Hi all,

this series replaced the DMA_ATTR_NON_CONSISTENT flag to dma_alloc_attrs
with a separate new dma_alloc_pages API, which is available on all
platforms.  In addition to cleaning up the convoluted code path, this
ensures that other drivers that have asked for better support for
non-coherent DMA to pages with incurring bounce buffering over can finally
be properly supported.

As a follow up I plan to move the implementation of the
DMA_ATTR_NO_KERNEL_MAPPING flag over to this framework as well, given
that is also is a fundamentally non coherent allocation.  The replacement
for that flag would then return a struct page, as it is allowed to
actually return pages without a kernel mapping as the name suggested
(although most of the time they will actually have a kernel mapping..)

In addition to the conversions of the existing non-coherent DMA users,
I've also added a patch to convert the firewire ohci driver to use
the new dma_alloc_pages API.

The first patch is queued up for 5.9 in the media tree, but included here
for completeness.


A git tree is available here:

    git://git.infradead.org/users/hch/misc.git dma_alloc_pages

Gitweb:

    http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma_alloc_pages


Changes since v2:
 - fix up the patch reshuffle which wasn't quite correct
 - fix up a few commit messages

Changes since v1:
 - rebased on the latests dma-mapping tree, which merged many of the
   cleanups
 - fix an argument passing typo in 53c700, caught by sparse
 - rename a few macro arguments in 53c700
 - pass the right device to the DMA API in the lib82596 drivers
 - fix memory ownershiptransfers in sgiseeq
 - better document what a page in the direct kernel mapping means
 - split into dma_alloc_pages that returns a struct page and is in the
   direct mapping vs dma_alloc_noncoherent that can be vmapped
 - conver the firewire ohci driver to dma_alloc_pages

Diffstat:
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^ permalink raw reply	[flat|nested] 36+ messages in thread

end of thread, other threads:[~2020-09-26 15:25 UTC | newest]

Thread overview: 36+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-09-15 15:51 a saner API for allocating DMA addressable pages v3 Christoph Hellwig
2020-09-15 15:51 ` [PATCH 01/18] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT flag Christoph Hellwig
2020-09-25 18:47   ` Tomasz Figa
2020-09-15 15:51 ` [PATCH 02/18] mm: turn alloc_pages into an inline function Christoph Hellwig
2020-09-15 15:51 ` [PATCH 03/18] drm/exynos: stop setting DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2020-09-15 15:51 ` [PATCH 04/18] drm/nouveau/gk20a: " Christoph Hellwig
2020-09-15 15:51 ` [PATCH 05/18] net/au1000-eth: stop using DMA_ATTR_NON_CONSISTENT Christoph Hellwig
2020-09-15 15:51 ` [PATCH 06/18] lib82596: move DMA allocation into the callers of i82596_probe Christoph Hellwig
2020-09-22  8:48   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 07/18] 53c700: improve non-coherent DMA handling Christoph Hellwig
2020-09-22  8:49   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 08/18] dma-mapping: add a new dma_alloc_noncoherent API Christoph Hellwig
2020-09-25 11:15   ` Robin Murphy
2020-09-25 16:17     ` Christoph Hellwig
2020-09-15 15:51 ` [PATCH 09/18] sgiwd93: convert to dma_alloc_noncoherent Christoph Hellwig
2020-09-22  8:49   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 10/18] hal2: " Christoph Hellwig
2020-09-22  8:50   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 11/18] lib82596: " Christoph Hellwig
2020-09-22  8:50   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 12/18] sgiseeq: " Christoph Hellwig
2020-09-22  8:51   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 13/18] 53c700: " Christoph Hellwig
2020-09-22  8:51   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 14/18] dma-mapping: remove dma_cache_sync Christoph Hellwig
2020-09-22  8:52   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 15/18] dma-mapping: add a new dma_alloc_pages API Christoph Hellwig
2020-09-22  8:53   ` Thomas Bogendoerfer
2020-09-15 15:51 ` [PATCH 16/18] dma-mapping: add new {alloc, free}_noncoherent dma_map_ops methods Christoph Hellwig
2020-09-15 15:51 ` [PATCH 17/18] dma-iommu: implement ->alloc_noncoherent Christoph Hellwig
2020-09-25 18:46   ` Tomasz Figa
2020-09-26 14:14     ` Christoph Hellwig
2020-09-26 15:25       ` Tomasz Figa
2020-09-15 15:51 ` [PATCH 18/18] firewire-ohci: use dma_alloc_pages Christoph Hellwig
2020-09-21  6:36 ` a saner API for allocating DMA addressable pages v3 Christoph Hellwig
2020-09-25  4:21 ` Christoph Hellwig

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