El 14/08/15 a les 22.08, Jason A. Harmening ha escrit: > Author: jah > Date: Fri Aug 14 20:08:16 2015 > New Revision: 286787 > URL: https://svnweb.freebsd.org/changeset/base/286787 > > Log: > Use pmap_quick_enter_page() to handle bouncing of unmapped buffers in the > x86 busdma_bounce implementation. Also treat user buffers as unmapped. > This allows two things: > 1. Sync'ing bounced maps in non-sleepable contexts. The physcopy* calls > previously used could sleep on sf_buf operations in some cases. > 2. Sync'ing user buffers outside the context of the owning process
AFAICT this will break the Xen port. physcopy* uses uiomove_fromphys that on the amd64 port is able to deal with pages outside of the DMAP. OTOH pmap_quick_enter_page is not able to deal with pages outside of the DMAP, and will simply panic. Roger. _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
