From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2001:1868:205::9]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 2DF061A067D for ; Wed, 12 Aug 2015 17:09:32 +1000 (AEST) 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 16/31] s390: handle page-less SG entries Date: Wed, 12 Aug 2015 09:05:35 +0200 Message-Id: <1439363150-8661-17-git-send-email-hch@lst.de> In-Reply-To: <1439363150-8661-1-git-send-email-hch@lst.de> References: <1439363150-8661-1-git-send-email-hch@lst.de> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Use sg_phys() instead of page_to_phys(sg_page(sg)) so that we don't require a page structure for all DMA memory. Signed-off-by: Christoph Hellwig --- arch/s390/pci/pci_dma.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index 6fd8d58..aae5a47 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -272,14 +272,13 @@ int dma_set_mask(struct device *dev, u64 mask) } EXPORT_SYMBOL_GPL(dma_set_mask); -static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page, - unsigned long offset, size_t size, +static dma_addr_t s390_dma_map_phys(struct device *dev, unsigned long pa, + size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) { struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); unsigned long nr_pages, iommu_page_index; - unsigned long pa = page_to_phys(page) + offset; int flags = ZPCI_PTE_VALID; dma_addr_t dma_addr; @@ -301,7 +300,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page, if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) { atomic64_add(nr_pages, &zdev->mapped_pages); - return dma_addr + (offset & ~PAGE_MASK); + return dma_addr + (pa & ~PAGE_MASK); } out_free: @@ -312,6 +311,16 @@ out_err: return DMA_ERROR_CODE; } +static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + unsigned long pa = page_to_phys(page) + offset; + + return s390_dma_map_phys(dev, pa, size, direction, attrs); +} + static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) @@ -384,8 +393,7 @@ static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg, int i; for_each_sg(sg, s, nr_elements, i) { - struct page *page = sg_page(s); - s->dma_address = s390_dma_map_pages(dev, page, s->offset, + s->dma_address = s390_dma_map_phys(dev, sg_phys(s), s->length, dir, NULL); if (!dma_mapping_error(dev, s->dma_address)) { s->dma_length = s->length; -- 1.9.1