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Groups > linux.kernel > #1507563
| From | David Miller <davem@davemloft.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [net-next PATCH RFC 19/26] arch/sparc: Add option to skip DMA sync as a part of map and unmap |
| Date | 2016-10-24 20:30 +0200 |
| Message-ID | <svSau-2UD-41@gated-at.bofh.it> (permalink) |
| References | <svRR7-2Kt-9@gated-at.bofh.it> <svRR8-2Kt-45@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Alexander Duyck <alexander.h.duyck@intel.com> Date: Mon, 24 Oct 2016 08:06:07 -0400 > This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to > avoid invoking cache line invalidation if the driver will just handle it > via a sync_for_cpu or sync_for_device call. > > Cc: "David S. Miller" <davem@davemloft.net> > Cc: sparclinux@vger.kernel.org > Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> This is fine for avoiding the flush for performance reasons, but the chip isn't going to write anything back unless the device wrote into the area.
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[net-next PATCH RFC 19/26] arch/sparc: Add option to skip DMA sync as a part of map and unmap Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:10 +0200
Re: [net-next PATCH RFC 19/26] arch/sparc: Add option to skip DMA sync as a part of map and unmap David Miller <davem@davemloft.net> - 2016-10-24 20:30 +0200
Re: [net-next PATCH RFC 19/26] arch/sparc: Add option to skip DMA sync as a part of map and unmap Alexander Duyck <alexander.duyck@gmail.com> - 2016-10-24 21:40 +0200
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