Messages in this thread | | | Date | Thu, 31 Oct 2019 09:54:30 +0100 | From | Thomas Bogendoerfer <> | Subject | Re: [PATCH 1/4] net: sgi: ioc3-eth: don't abuse dma_direct_* calls |
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On Wed, 30 Oct 2019 23:38:18 +0100 Christoph Hellwig <hch@lst.de> wrote:
> On Wed, Oct 30, 2019 at 11:05:49PM +0100, Thomas Bogendoerfer wrote: > > On Wed, 30 Oct 2019 14:12:30 -0700 > > Christoph Hellwig <hch@lst.de> wrote: > > > > > dma_direct_ is a low-level API that must never be used by drivers > > > directly. Switch to use the proper DMA API instead. > > > > is the 4kb/16kb alignment still guaranteed ? If not how is the way > > to get such an alignment ? > > The DMA API gives you page aligned memory. dma_direct doesn't give you > any gurantees as it is an internal API explicitly documented as not > for driver usage that can change at any time.
I didn't want to argue about that. What I'm interested in is a way how to allocate dma memory, which is 16kB aligned, via the DMA API ?
Thomas.
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