On Tue, 2009-05-12 at 20:56 +0000, Marius Strobl wrote: > Author: marius > Date: Tue May 12 20:56:34 2009 > New Revision: 192026 > URL: http://svn.freebsd.org/changeset/base/192026 > > Log: > Correct r190283 (partially reverting it) as on sparc64 BUS_DMA_NOCACHE > actually is only valid for bus_dmamap_load().
Ok, this is getting very confusing... This means that code has to set this flag on both alloc and load to allow for somethine resembling consistent behavior. robert. > MFC after: 3 days > > Modified: > head/share/man/man9/bus_dma.9 > > Modified: head/share/man/man9/bus_dma.9 > ============================================================================== > --- head/share/man/man9/bus_dma.9 Tue May 12 20:42:12 2009 > (r192025) > +++ head/share/man/man9/bus_dma.9 Tue May 12 20:56:34 2009 > (r192026) > @@ -60,7 +60,7 @@ > .\" $FreeBSD$ > .\" $NetBSD: bus_dma.9,v 1.25 2002/10/14 13:43:16 wiz Exp $ > .\" > -.Dd November 16, 2008 > +.Dd May 12, 2009 > .Dt BUS_DMA 9 > .Os > .Sh NAME > @@ -561,6 +561,13 @@ Are as follows: > .It Dv BUS_DMA_NOWAIT > The load should not be deferred in case of insufficient mapping resources, > and instead should return immediately with an appropriate error. > +.It Dv BUS_DMA_NOCACHE > +The generated transactions to and from the virtual page are non-cacheable. > +For > +.Fn bus_dmamap_load , > +the > +.Dv BUS_DMA_NOCACHE > +flag is currently implemented on sparc64. > .El > .El > .Pp > @@ -780,11 +787,12 @@ Causes the allocated memory to be set to > The allocated memory will not be cached in the processor caches. > All memory accesses appear on the bus and are executed > without reordering. > -On the amd64 and i386 architectures this flag results in the > -Strong Uncacheable PAT to be set for the allocated virtual address range. > -The > +For > +.Fn bus_dmamem_alloc , > +the > .Dv BUS_DMA_NOCACHE > -flag is currently implemented on amd64, i386 and sparc64. > +flag is currently implemented on amd64 and i386 where it results in the > +Strong Uncacheable PAT to be set for the allocated virtual address range. > .El > .It Fa mapp > Pointer to a -- Robert Noland <rnol...@freebsd.org> FreeBSD
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