From owner-svn-src-stable@FreeBSD.ORG Wed Dec 8 19:48:30 2010 Return-Path: Delivered-To: svn-src-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1C2B0106566C; Wed, 8 Dec 2010 19:48:30 +0000 (UTC) (envelope-from cperciva@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 013978FC08; Wed, 8 Dec 2010 19:48:30 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id oB8JmTMu013093; Wed, 8 Dec 2010 19:48:29 GMT (envelope-from cperciva@svn.freebsd.org) Received: (from cperciva@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id oB8JmTOT013091; Wed, 8 Dec 2010 19:48:29 GMT (envelope-from cperciva@svn.freebsd.org) Message-Id: <201012081948.oB8JmTOT013091@svn.freebsd.org> From: Colin Percival Date: Wed, 8 Dec 2010 19:48:29 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org X-SVN-Group: stable-8 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r216305 - stable/8/sys/i386/i386 X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Dec 2010 19:48:30 -0000 Author: cperciva Date: Wed Dec 8 19:48:29 2010 New Revision: 216305 URL: http://svn.freebsd.org/changeset/base/216305 Log: MFC r216194 / MFamd64 r206610: Enforce stronger alignment semantics in order to unbreak the Xen blkfront driver. Approved by: re (kib) Modified: stable/8/sys/i386/i386/busdma_machdep.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) Modified: stable/8/sys/i386/i386/busdma_machdep.c ============================================================================== --- stable/8/sys/i386/i386/busdma_machdep.c Wed Dec 8 19:42:21 2010 (r216304) +++ stable/8/sys/i386/i386/busdma_machdep.c Wed Dec 8 19:48:29 2010 (r216305) @@ -249,8 +249,7 @@ bus_dma_tag_create(bus_dma_tag_t parent, newtag->alignment = alignment; newtag->boundary = boundary; newtag->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1); - newtag->highaddr = trunc_page((vm_paddr_t)highaddr) + - (PAGE_SIZE - 1); + newtag->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1); newtag->filter = filter; newtag->filterarg = filterarg; newtag->maxsize = maxsize; @@ -597,15 +596,19 @@ _bus_dmamap_count_pages(bus_dma_tag_t dm vendaddr = (vm_offset_t)buf + buflen; while (vaddr < vendaddr) { + bus_size_t sg_len; + + sg_len = PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK); if (pmap) paddr = pmap_extract(pmap, vaddr); else paddr = pmap_kextract(vaddr); if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && run_filter(dmat, paddr) != 0) { + sg_len = roundup2(sg_len, dmat->alignment); map->pagesneeded++; } - vaddr += (PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK)); + vaddr += sg_len; } CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); } @@ -672,6 +675,8 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dm bmask = ~(dmat->boundary - 1); for (seg = *segp; buflen > 0 ; ) { + bus_size_t max_sgsize; + /* * Get the physical address for this segment. */ @@ -683,11 +688,16 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dm /* * Compute the segment size, and adjust counts. */ - sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK); - if (sgsize > dmat->maxsegsz) - sgsize = dmat->maxsegsz; - if (buflen < sgsize) - sgsize = buflen; + max_sgsize = MIN(buflen, dmat->maxsegsz); + sgsize = PAGE_SIZE - ((vm_offset_t)curaddr & PAGE_MASK); + if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && + map->pagesneeded != 0 && run_filter(dmat, curaddr)) { + sgsize = roundup2(sgsize, dmat->alignment); + sgsize = MIN(sgsize, max_sgsize); + curaddr = add_bounce_page(dmat, map, vaddr, sgsize); + } else { + sgsize = MIN(sgsize, max_sgsize); + } /* * Make sure we don't cross any boundaries. @@ -698,10 +708,6 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dm sgsize = (baddr - curaddr); } - if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && - map->pagesneeded != 0 && run_filter(dmat, curaddr)) - curaddr = add_bounce_page(dmat, map, vaddr, sgsize); - /* * Insert chunk into a segment, coalescing with * previous segment if possible.