Author: manu Date: Tue May 22 13:45:24 2018 New Revision: 334041 URL: https://svnweb.freebsd.org/changeset/base/334041
Log: bus_dma(9): Correct arm64 BUS_DMA_COHERENT implementation note BUS_DMA_COHERENT isn't supported in bus_dmamap_create but bus_dma_tag_create. Document it properly. Submitted by: andrew 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 22 13:30:56 2018 (r334040) +++ head/share/man/man9/bus_dma.9 Tue May 22 13:45:24 2018 (r334041) @@ -446,6 +446,15 @@ allocated with Also, due to resource sharing with other tags, this flag does not guarantee that resources will be allocated or reserved exclusively for this tag. It should be treated only as a minor optimization. +.It Dv BUS_DMA_COHERENT +Indicate that the DMA engine and CPU are cache-coherent. +Cached memory may be used to back allocations created by +.Fn bus_dmamem_alloc . +For +.Fn bus_dma_tag_create , +the +.Dv BUS_DMA_COHERENT +flag is currently implemented on arm64. .El .It Fa lockfunc Optional lock manipulation function (may be @@ -504,7 +513,7 @@ For .Fn bus_dmamap_create , the .Dv BUS_DMA_COHERENT -flag is currently implemented on arm64 and sparc64. +flag is currently implemented on sparc64. .El .It Fa mapp Pointer to a _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
