From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754324AbYIHMCc (ORCPT ); Mon, 8 Sep 2008 08:02:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752743AbYIHMCW (ORCPT ); Mon, 8 Sep 2008 08:02:22 -0400 Received: from outbound-sin.frontbridge.com ([207.46.51.80]:59678 "EHLO SG2EHSOBE005.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752728AbYIHMCV (ORCPT ); Mon, 8 Sep 2008 08:02:21 -0400 X-BigFish: VPS-34(zz1102L1432R98dR1805M936fQzz10d3izzz32i6bh43j62h) X-Spam-TCS-SCL: 1:0 X-WSS-ID: 0K6VLF8-04-Q4I-01 Date: Mon, 8 Sep 2008 14:01:56 +0200 From: Joerg Roedel To: FUJITA Tomonori CC: linux-kernel@vger.kernel.org, mingo@redhat.com, tony.luck@intel.com, linux-ia64@vger.kernel.org, iommu@lists.linux-foundation.org Subject: Re: [PATCH 4/5] x86: dma_alloc_coherent sets gfp flags properly Message-ID: <20080908120156.GL3189@amd.com> References: <1220865014-1169-1-git-send-email-fujita.tomonori@lab.ntt.co.jp> <1220865014-1169-2-git-send-email-fujita.tomonori@lab.ntt.co.jp> <1220865014-1169-3-git-send-email-fujita.tomonori@lab.ntt.co.jp> <1220865014-1169-4-git-send-email-fujita.tomonori@lab.ntt.co.jp> <1220865014-1169-5-git-send-email-fujita.tomonori@lab.ntt.co.jp> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <1220865014-1169-5-git-send-email-fujita.tomonori@lab.ntt.co.jp> User-Agent: mutt-ng/devel-r804 (Linux) X-OriginalArrivalTime: 08 Sep 2008 12:01:56.0697 (UTC) FILETIME=[B0E96C90:01C911AA] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 08, 2008 at 06:10:13PM +0900, FUJITA Tomonori wrote: > Non real IOMMU implemenations (which doesn't do virtual mappings, > e.g. swiotlb, pci-nommu, etc) need to use proper gfp flags and > dma_mask to allocate pages in their own dma_alloc_coherent() > (allocated page need to be suitable for device's coherent_dma_mask). > > This patch makes dma_alloc_coherent do this job so that IOMMUs don't > need to take care of it any more. > > Real IOMMU implemenataions can simply ignore the gfp flags. > > Signed-off-by: FUJITA Tomonori Acked-by: Joerg Roedel > --- > arch/x86/kernel/pci-nommu.c | 19 ++----------------- > include/asm-x86/dma-mapping.h | 32 ++++++++++++++++++++++++++++---- > 2 files changed, 30 insertions(+), 21 deletions(-) > > diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c > index ada1c87..8e398b5 100644 > --- a/arch/x86/kernel/pci-nommu.c > +++ b/arch/x86/kernel/pci-nommu.c > @@ -80,26 +80,11 @@ nommu_alloc_coherent(struct device *hwdev, size_t size, > int node; > struct page *page; > > - gfp |= __GFP_ZERO; > - > - dma_mask = hwdev->coherent_dma_mask; > - if (!dma_mask) > - dma_mask = *(hwdev->dma_mask); > + dma_mask = dma_alloc_coherent_mask(hwdev, gfp); > > - if (dma_mask < DMA_24BIT_MASK) > - return NULL; > + gfp |= __GFP_ZERO; > > node = dev_to_node(hwdev); > - > -#ifdef CONFIG_X86_64 > - if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA)) > - gfp |= GFP_DMA32; > -#endif > - > - /* No alloc-free penalty for ISA devices */ > - if (dma_mask == DMA_24BIT_MASK) > - gfp |= GFP_DMA; > - > again: > page = alloc_pages_node(node, gfp, get_order(size)); > if (!page) > diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h > index 9d6dcf4..a072ae6 100644 > --- a/include/asm-x86/dma-mapping.h > +++ b/include/asm-x86/dma-mapping.h > @@ -241,6 +241,29 @@ static inline int dma_get_cache_alignment(void) > return boot_cpu_data.x86_clflush_size; > } > > +static inline unsigned long dma_alloc_coherent_mask(struct device *dev, > + gfp_t gfp) > +{ > + unsigned long dma_mask = 0; > + > + dma_mask = dev->coherent_dma_mask; > + if (!dma_mask) > + dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK; > + > + return dma_mask; > +} > + > +static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp) > +{ > + unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp); > + > +#ifdef CONFIG_X86_64 > + if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA)) > + gfp |= GFP_DMA32; > +#endif > + return gfp; > +} > + > static inline void * > dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, > gfp_t gfp) > @@ -261,10 +284,11 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, > if (!dev->dma_mask) > return NULL; > > - if (ops->alloc_coherent) > - return ops->alloc_coherent(dev, size, > - dma_handle, gfp); > - return NULL; > + if (!ops->alloc_coherent) > + return NULL; > + > + return ops->alloc_coherent(dev, size, dma_handle, > + dma_alloc_coherent_gfp_flags(dev, gfp)); > } > > static inline void dma_free_coherent(struct device *dev, size_t size, > -- > 1.5.5.GIT > > -- | AMD Saxony Limited Liability Company & Co. 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