[RFC,6/7] x86: support dma_map_pfn()

Message ID	20150316202559.33102.58183.stgit@dwillia2-desk3.amr.corp.intel.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-fsdevel-owner@kernel.org> Subject: [RFC PATCH 6/7] x86: support dma_map_pfn() From: Dan Williams <dan.j.williams@intel.com> To: linux-kernel@vger.kernel.org Cc: axboe@kernel.dk, hch@infradead.org, riel@redhat.com, linux-nvdimm@lists.01.org, linux-raid@vger.kernel.org, mgorman@suse.de, linux-fsdevel@vger.kernel.org Date: Mon, 16 Mar 2015 16:25:59 -0400 Message-ID: <20150316202559.33102.58183.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <20150316201640.33102.33761.stgit@dwillia2-desk3.amr.corp.intel.com> References: <20150316201640.33102.33761.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.17.1-8-g92dd MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index b7d31ca55187..3be1c0ac0025 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -801,6 +801,7 @@ config CALGARY_IOMMU bool "IBM Calgary IOMMU support" select SWIOTLB depends on X86_64 && PCI + depends on !HAVE_DMA_PFN ---help--- Support for hardware IOMMUs in IBM's xSeries x366 and x460 systems. Needed to run systems with more than 3GB of memory @@ -1430,6 +1431,17 @@ config ILLEGAL_POINTER_VALUE source "mm/Kconfig" +config PMEM_DMA + bool "Support DMA to Persistent Memory" + select HAVE_DMA_PFN + ---help--- + Enable drivers that are capable of performing DMA to + Persistent Memory. Drivers with this capability are prepared + to map memory with either dma_map_pfn() or a dma_map_sg() + implementation that is pfn capable. Note, some iommus, like + CONFIG_CALGARY_IOMMU are incompatible (disabled by this + option). + config HIGHPTE bool "Allocate 3rd-level pagetables from highmem" depends on HIGHMEM diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c index 8e3842fc8bea..92c9f8139b08 100644 --- a/arch/x86/kernel/amd_gart_64.c +++ b/arch/x86/kernel/amd_gart_64.c @@ -239,13 +239,13 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem, } /* Map a single area into the IOMMU */ -static dma_addr_t gart_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - struct dma_attrs *attrs) +static dma_addr_t gart_map_pfn(struct device *dev, __pfn_t pfn, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) { unsigned long bus; - phys_addr_t paddr = page_to_phys(page) + offset; + phys_addr_t paddr = pfn_to_phys(pfn) + offset; if (!dev) dev = &x86_dma_fallback_dev; @@ -259,6 +259,14 @@ static dma_addr_t gart_map_page(struct device *dev, struct page *page, return bus; } +static __maybe_unused dma_addr_t gart_map_page(struct device *dev, + struct page *page, unsigned long offset, size_t size, + enum dma_data_direction dir, struct dma_attrs *attrs) +{ + return gart_map_pfn(dev, page_to_pfn_typed(page), offset, size, dir, + attrs); +} + /* * Free a DMA mapping. */ @@ -699,7 +707,11 @@ static __init int init_amd_gatt(struct agp_kern_info *info) static struct dma_map_ops gart_dma_ops = { .map_sg = gart_map_sg, .unmap_sg = gart_unmap_sg, +#ifdef CONFIG_HAVE_DMA_PFN + .map_pfn = gart_map_pfn, +#else .map_page = gart_map_page, +#endif .unmap_page = gart_unmap_page, .alloc = gart_alloc_coherent, .free = gart_free_coherent, diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c index da15918d1c81..dfb66c4b8a73 100644 --- a/arch/x86/kernel/pci-nommu.c +++ b/arch/x86/kernel/pci-nommu.c @@ -25,12 +25,12 @@ check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size) return 1; } -static dma_addr_t nommu_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - struct dma_attrs *attrs) +static dma_addr_t nommu_map_pfn(struct device *dev, __pfn_t pfn, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) { - dma_addr_t bus = page_to_phys(page) + offset; + dma_addr_t bus = pfn_to_phys(pfn) + offset; WARN_ON(size == 0); if (!check_addr("map_single", dev, bus, size)) return DMA_ERROR_CODE; @@ -38,6 +38,14 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page, return bus; } +static __maybe_unused dma_addr_t nommu_map_page(struct device *dev, + struct page *page, unsigned long offset, size_t size, + enum dma_data_direction dir, struct dma_attrs *attrs) +{ + return nommu_map_pfn(dev, page_to_pfn_typed(page), offset, size, dir, + attrs); +} + /* Map a set of buffers described by scatterlist in streaming * mode for DMA. This is the scatter-gather version of the * above pci_map_single interface. Here the scatter gather list @@ -92,7 +100,11 @@ struct dma_map_ops nommu_dma_ops = { .alloc = dma_generic_alloc_coherent, .free = dma_generic_free_coherent, .map_sg = nommu_map_sg, +#ifdef CONFIG_HAVE_DMA_PFN + .map_pfn = nommu_map_pfn, +#else .map_page = nommu_map_page, +#endif .sync_single_for_device = nommu_sync_single_for_device, .sync_sg_for_device = nommu_sync_sg_for_device, .is_phys = 1, diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c index 77dd0ad58be4..5351eb8c8f7f 100644 --- a/arch/x86/kernel/pci-swiotlb.c +++ b/arch/x86/kernel/pci-swiotlb.c @@ -48,7 +48,11 @@ static struct dma_map_ops swiotlb_dma_ops = { .sync_sg_for_device = swiotlb_sync_sg_for_device, .map_sg = swiotlb_map_sg_attrs, .unmap_sg = swiotlb_unmap_sg_attrs, +#ifdef CONFIG_HAVE_DMA_PFN + .map_pfn = swiotlb_map_pfn, +#else .map_page = swiotlb_map_page, +#endif .unmap_page = swiotlb_unmap_page, .dma_supported = NULL, }; diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c index 5ceda85b8687..d1c6e3808bb5 100644 --- a/arch/x86/pci/sta2x11-fixup.c +++ b/arch/x86/pci/sta2x11-fixup.c @@ -182,7 +182,11 @@ static void *sta2x11_swiotlb_alloc_coherent(struct device *dev, static struct dma_map_ops sta2x11_dma_ops = { .alloc = sta2x11_swiotlb_alloc_coherent, .free = x86_swiotlb_free_coherent, +#ifdef CONFIG_HAVE_DMA_PFN + .map_pfn = swiotlb_map_pfn, +#else .map_page = swiotlb_map_page, +#endif .unmap_page = swiotlb_unmap_page, .map_sg = swiotlb_map_sg_attrs, .unmap_sg = swiotlb_unmap_sg_attrs, diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c index 0e98e5d241d0..e65ea48d7aed 100644 --- a/arch/x86/xen/pci-swiotlb-xen.c +++ b/arch/x86/xen/pci-swiotlb-xen.c @@ -28,7 +28,11 @@ static struct dma_map_ops xen_swiotlb_dma_ops = { .sync_sg_for_device = xen_swiotlb_sync_sg_for_device, .map_sg = xen_swiotlb_map_sg_attrs, .unmap_sg = xen_swiotlb_unmap_sg_attrs, +#ifdef CONFIG_HAVE_DMA_PFN + .map_pfn = xen_swiotlb_map_pfn, +#else .map_page = xen_swiotlb_map_page, +#endif .unmap_page = xen_swiotlb_unmap_page, .dma_supported = xen_swiotlb_dma_supported, }; diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 48882c126245..65fc71985c14 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2765,16 +2765,15 @@ static void __unmap_single(struct dma_ops_domain *dma_dom, /* * The exported map_single function for dma_ops. */ -static dma_addr_t map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - struct dma_attrs *attrs) +static dma_addr_t map_pfn(struct device *dev, __pfn_t pfn, unsigned long offset, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) { unsigned long flags; struct protection_domain *domain; dma_addr_t addr; u64 dma_mask; - phys_addr_t paddr = page_to_phys(page) + offset; + phys_addr_t paddr = pfn_to_phys(pfn) + offset; INC_STATS_COUNTER(cnt_map_single); @@ -2799,6 +2798,14 @@ out: spin_unlock_irqrestore(&domain->lock, flags); return addr; + +} + +static __maybe_unused dma_addr_t map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return map_pfn(dev, page_to_pfn_typed(page), offset, size, dir, attrs); } /* @@ -3063,7 +3070,11 @@ static void __init prealloc_protection_domains(void) static struct dma_map_ops amd_iommu_dma_ops = { .alloc = alloc_coherent, .free = free_coherent, +#ifdef CONFIG_HAVE_DMA_PFN + .map_pfn = map_pfn, +#else .map_page = map_page, +#endif .unmap_page = unmap_page, .map_sg = map_sg, .unmap_sg = unmap_sg, diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index e10d62f2e61f..e3d304d4c162 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3087,15 +3087,23 @@ error: return 0; } -static dma_addr_t intel_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - struct dma_attrs *attrs) +static dma_addr_t intel_map_pfn(struct device *dev, __pfn_t pfn, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) { - return __intel_map_single(dev, page_to_phys(page) + offset, size, + return __intel_map_single(dev, pfn_to_phys(pfn) + offset, size, dir, *dev->dma_mask); } +static __maybe_unused dma_addr_t intel_map_page(struct device *dev, + struct page *page, unsigned long offset, size_t size, + enum dma_data_direction dir, struct dma_attrs *attrs) +{ + return intel_map_pfn(dev, page_to_pfn_typed(page), offset, size, dir, + attrs); +} + static void flush_unmaps(void) { int i, j; @@ -3381,7 +3389,11 @@ struct dma_map_ops intel_dma_ops = { .free = intel_free_coherent, .map_sg = intel_map_sg, .unmap_sg = intel_unmap_sg, +#ifdef CONFIG_HAVE_DMA_PFN + .map_pfn = intel_map_pfn, +#else .map_page = intel_map_page, +#endif .unmap_page = intel_unmap_page, .mapping_error = intel_mapping_error, }; diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index 810ad419e34c..bd29d09bbacc 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -382,10 +382,10 @@ EXPORT_SYMBOL_GPL(xen_swiotlb_free_coherent); * Once the device is given the dma address, the device owns this memory until * either xen_swiotlb_unmap_page or xen_swiotlb_dma_sync_single is performed. */ -dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - struct dma_attrs *attrs) +dma_addr_t xen_swiotlb_map_pfn(struct device *dev, unsigned long pfn, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) { phys_addr_t map, phys = page_to_phys(page) + offset; dma_addr_t dev_addr = xen_phys_to_bus(phys); @@ -429,6 +429,16 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page, } return dev_addr; } +EXPORT_SYMBOL_GPL(xen_swiotlb_map_pfn); + +dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return xen_swiotlb_map_pfn(dev, page_to_pfn(page), offset, size, dir, + attrs); +} EXPORT_SYMBOL_GPL(xen_swiotlb_map_page); /* @@ -582,15 +592,14 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, attrs); sg->dma_address = xen_phys_to_bus(map); } else { + __pfn_t pfn = { .pfn = paddr >> PAGE_SHIFT }; + unsigned long offset = paddr & ~PAGE_MASK; + /* we are not interested in the dma_addr returned by * xen_dma_map_page, only in the potential cache flushes executed * by the function. */ - xen_dma_map_page(hwdev, pfn_to_page(paddr >> PAGE_SHIFT), - dev_addr, - paddr & ~PAGE_MASK, - sg->length, - dir, - attrs); + xen_dma_map_pfn(hwdev, pfn, dev_addr, offset, + sg->length, attrs); sg->dma_address = dev_addr; } sg_dma_len(sg) = sg->length; diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index dc3a94ce3b45..78b136b0b139 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -67,6 +67,10 @@ extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); +extern dma_addr_t swiotlb_map_pfn(struct device *dev, __pfn_t pfn, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs); extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 4abda074ea45..fc164041ec22 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -727,12 +727,12 @@ swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir, * Once the device is given the dma address, the device owns this memory until * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. */ -dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - struct dma_attrs *attrs) +dma_addr_t swiotlb_map_pfn(struct device *dev, __pfn_t pfn, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) { - phys_addr_t map, phys = page_to_phys(page) + offset; + phys_addr_t map, phys = pfn_to_phys(pfn) + offset; dma_addr_t dev_addr = phys_to_dma(dev, phys); BUG_ON(dir == DMA_NONE); @@ -763,6 +763,16 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, return dev_addr; } +EXPORT_SYMBOL_GPL(swiotlb_map_pfn); + +dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return swiotlb_map_pfn(dev, page_to_pfn_typed(page), offset, size, dir, + attrs); +} EXPORT_SYMBOL_GPL(swiotlb_map_page); /*

[RFC,6/7] x86: support dma_map_pfn()

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