Any comments?
Thomas: this should be identical to the git tree I gave you for mips testing, and you add your tested-by (and reviewd-by tags where applicable)?
Helge: for parisc this should effectively be the same as the first version, but I've dropped the tested-by tags due to the reshuffle, and chance you could retest it?
On Tue, Sep 15, 2020 at 05:51:04PM +0200, Christoph Hellwig wrote:
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_pagesGitweb:
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma_alloc_pagesChanges 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
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