From: Christoph Hellwig <hch@lst.de>
To: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Cc: Chris Zankel <chris-YvXeqwSYzG2sTnJN9+BGXg@public.gmane.org>,
Michal Simek <monstr-pSz03upnqPeHXe+LvDLADg@public.gmane.org>,
linux-ia64-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org,
linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
linux-xtensa-PjhNF2WwrV/0Sa2dR60CXw@public.gmane.org,
x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Max Filippov <jcmvbkbc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Guan Xuetao <gxt-TG0Ac1+ktVePQbnJrJN+5g@public.gmane.org>
Subject: refactor dma_cache_sync
Date: Sun, 27 Aug 2017 16:10:20 +0000 [thread overview]
Message-ID: <20170827161032.22772-1-hch@lst.de> (raw)
The dma_cache_sync routines is used to flush caches for memory returned
by dma_alloc_attrs with the DMA_ATTR_NON_CONSISTENT flag (or previously
from dma_alloc_noncoherent), but the requirements for it seems to be
frequently misunderstood. dma_cache_sync is documented to be a no-op for
allocations that do not have the DMA_ATTR_NON_CONSISTENT flag set, and
yet a lot of architectures implement it in some way despite not
implementing DMA_ATTR_NON_CONSISTENT.
This series removes a few abuses of dma_cache_sync for non-DMA API
purposes, then changes all remaining architectures that do not implement
DMA_ATTR_NON_CONSISTENT to implement dma_cache_sync as a no-op, and
then adds the struct dma_map_ops indirection we use for all other
DMA mapping operations to dma_cache_sync as well, thus removing all but
two implementations of the function.
next reply other threads:[~2017-08-27 16:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-27 16:10 Christoph Hellwig [this message]
[not found] ` <20170827161032.22772-1-hch-jcswGhMUV9g@public.gmane.org>
2017-08-27 16:10 ` [PATCH 01/12] floppy: consolidate the dummy fd_cacheflush definition Christoph Hellwig
2017-08-27 16:10 ` [PATCH 02/12] mips: don't use dma_cache_sync to implement fd_cacheflush Christoph Hellwig
2017-08-27 16:10 ` [PATCH 04/12] x86: make dma_cache_sync a no-op Christoph Hellwig
[not found] ` <20170827161032.22772-5-hch-jcswGhMUV9g@public.gmane.org>
2017-08-31 14:06 ` Thomas Gleixner
2017-08-27 16:10 ` [PATCH 05/12] ia64: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 06/12] microblaze: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 08/12] powerpc: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 10/12] xtensa: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 03/12] frv: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 07/12] mn10300: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 09/12] unicore32: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 11/12] sh: " Christoph Hellwig
2017-08-27 16:10 ` [PATCH 12/12] dma-mapping: turn dma_cache_sync into a dma_map_ops method Christoph Hellwig
2017-08-28 6:26 ` Geert Uytterhoeven
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