On Tue, 2013-10-22 at 21:51 +0000, Olivier Houchard wrote: > Author: cognet > Date: Tue Oct 22 21:51:07 2013 > New Revision: 256943 > URL: http://svnweb.freebsd.org/changeset/base/256943 > > Log: > - Use bus_dmamap_unload(), it is not optional. > - The new allocator won't return coherent memory for any size > PAGE_SIZE, > so don't assume we have coherent memory, and explicitely use > bus_dmamap_sync(). > > Modified: > head/sys/arm/xscale/ixp425/if_npe.c > [snip]
Whoa, not true! If you ask for BUS_DMA_COHERENT memory on arm you are g'teed to get uncached memory. If the size you ask for is under one page it comes from the uma allocator, if you want a page or more it comes from either kmem_alloc_attr() or kmem_alloc_contig() using the VM_MEMATTR_UNCACHEABLE flag, which is handled in arm/pmap[-v6].c by turning off the cache and buffered bits on the pages. -- Ian _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
