Date: Thu, 20 Apr 2017 15:18:15 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r317196 - head/sys/dev/fb Message-ID: <201704201518.v3KFIFVk051662@repo.freebsd.org>
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Author: kib Date: Thu Apr 20 15:18:15 2017 New Revision: 317196 URL: https://svnweb.freebsd.org/changeset/base/317196 Log: Write-combine framebuffer writes through user-space mappings, if possible. Note that KVA mapping of the framebuffer already uses write-combining mode, so the change, besides improving speed of user mode writes, also satisfies requirement of the IA32 architecture of using consistent caching modes for multiple mappings of the same page. Reported and tested by: bde Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/dev/fb/vesa.c Modified: head/sys/dev/fb/vesa.c ============================================================================== --- head/sys/dev/fb/vesa.c Thu Apr 20 15:06:16 2017 (r317195) +++ head/sys/dev/fb/vesa.c Thu Apr 20 15:18:15 2017 (r317196) @@ -1643,6 +1643,9 @@ vesa_mmap(video_adapter_t *adp, vm_ooffs if (offset > adp->va_window_size - PAGE_SIZE) return (-1); *paddr = adp->va_info.vi_buffer + offset; +#ifdef VM_MEMATTR_WRITE_COMBINING + *memattr = VM_MEMATTR_WRITE_COMBINING; +#endif return (0); } return ((*prevvidsw->mmap)(adp, offset, paddr, prot, memattr));
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