Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965002AbbHLHJM (ORCPT ); Wed, 12 Aug 2015 03:09:12 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:52951 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934057AbbHLHI7 (ORCPT ); Wed, 12 Aug 2015 03:08:59 -0400 From: Christoph Hellwig To: torvalds@linux-foundation.org, axboe@kernel.dk Cc: dan.j.williams@intel.com, vgupta@synopsys.com, hskinnemoen@gmail.com, egtvedt@samfundet.no, realmz6@gmail.com, dhowells@redhat.com, monstr@monstr.eu, x86@kernel.org, dwmw2@infradead.org, alex.williamson@redhat.com, grundler@parisc-linux.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-metag@vger.kernel.org, linux-mips@linux-mips.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-nvdimm@ml01.01.org, linux-media@vger.kernel.org Subject: [PATCH 05/31] x86/pci-calgary: handle page-less SG entries Date: Wed, 12 Aug 2015 09:05:24 +0200 Message-Id: <1439363150-8661-6-git-send-email-hch@lst.de> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439363150-8661-1-git-send-email-hch@lst.de> References: <1439363150-8661-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1705 Lines: 50 For the iommu offset we just need and offset into the page. Calculate that using the physical address instead of using the virtual address so that we don't require a virtual mapping. Signed-off-by: Christoph Hellwig --- arch/x86/kernel/pci-calgary_64.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c index 0497f71..8f1581d 100644 --- a/arch/x86/kernel/pci-calgary_64.c +++ b/arch/x86/kernel/pci-calgary_64.c @@ -368,16 +368,14 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg, { struct iommu_table *tbl = find_iommu_table(dev); struct scatterlist *s; - unsigned long vaddr; + unsigned long paddr; unsigned int npages; unsigned long entry; int i; for_each_sg(sg, s, nelems, i) { - BUG_ON(!sg_page(s)); - - vaddr = (unsigned long) sg_virt(s); - npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE); + paddr = sg_phys(s); + npages = iommu_num_pages(paddr, s->length, PAGE_SIZE); entry = iommu_range_alloc(dev, tbl, npages); if (entry == DMA_ERROR_CODE) { @@ -389,7 +387,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg, s->dma_address = (entry << PAGE_SHIFT) | s->offset; /* insert into HW table */ - tce_build(tbl, entry, npages, vaddr & PAGE_MASK, dir); + tce_build(tbl, entry, npages, paddr & PAGE_MASK, dir); s->dma_length = s->length; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/