8d8bb39b9e
Add per-device dma_mapping_ops support for CONFIG_X86_64 as POWER architecture does: This enables us to cleanly fix the Calgary IOMMU issue that some devices are not behind the IOMMU (http://lkml.org/lkml/2008/5/8/423). I think that per-device dma_mapping_ops support would be also helpful for KVM people to support PCI passthrough but Andi thinks that this makes it difficult to support the PCI passthrough (see the above thread). So I CC'ed this to KVM camp. Comments are appreciated. A pointer to dma_mapping_ops to struct dev_archdata is added. If the pointer is non NULL, DMA operations in asm/dma-mapping.h use it. If it's NULL, the system-wide dma_ops pointer is used as before. If it's useful for KVM people, I plan to implement a mechanism to register a hook called when a new pci (or dma capable) device is created (it works with hot plugging). It enables IOMMUs to set up an appropriate dma_mapping_ops per device. The major obstacle is that dma_mapping_error doesn't take a pointer to the device unlike other DMA operations. So x86 can't have dma_mapping_ops per device. Note all the POWER IOMMUs use the same dma_mapping_error function so this is not a problem for POWER but x86 IOMMUs use different dma_mapping_error functions. The first patch adds the device argument to dma_mapping_error. The patch is trivial but large since it touches lots of drivers and dma-mapping.h in all the architecture. This patch: dma_mapping_error() doesn't take a pointer to the device unlike other DMA operations. So we can't have dma_mapping_ops per device. Note that POWER already has dma_mapping_ops per device but all the POWER IOMMUs use the same dma_mapping_error function. x86 IOMMUs use device argument. [akpm@linux-foundation.org: fix sge] [akpm@linux-foundation.org: fix svc_rdma] [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix bnx2x] [akpm@linux-foundation.org: fix s2io] [akpm@linux-foundation.org: fix pasemi_mac] [akpm@linux-foundation.org: fix sdhci] [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix sparc] [akpm@linux-foundation.org: fix ibmvscsi] Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Muli Ben-Yehuda <muli@il.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
309 lines
7.1 KiB
C
309 lines
7.1 KiB
C
/* Copyright (C) 2002 by James.Bottomley@HansenPartnership.com
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*
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* Implements the generic device dma API via the existing pci_ one
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* for unconverted architectures
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*/
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#ifndef _ASM_GENERIC_DMA_MAPPING_H
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#define _ASM_GENERIC_DMA_MAPPING_H
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#ifdef CONFIG_PCI
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/* we implement the API below in terms of the existing PCI one,
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* so include it */
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#include <linux/pci.h>
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/* need struct page definitions */
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#include <linux/mm.h>
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static inline int
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dma_supported(struct device *dev, u64 mask)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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return pci_dma_supported(to_pci_dev(dev), mask);
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}
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static inline int
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dma_set_mask(struct device *dev, u64 dma_mask)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
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}
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static inline void *
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dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t flag)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
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}
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static inline void
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dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_handle)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_free_consistent(to_pci_dev(dev), size, cpu_addr, dma_handle);
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}
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static inline dma_addr_t
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dma_map_single(struct device *dev, void *cpu_addr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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return pci_map_single(to_pci_dev(dev), cpu_addr, size, (int)direction);
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}
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static inline void
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_unmap_single(to_pci_dev(dev), dma_addr, size, (int)direction);
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}
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static inline dma_addr_t
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dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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return pci_map_page(to_pci_dev(dev), page, offset, size, (int)direction);
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}
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static inline void
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dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_unmap_page(to_pci_dev(dev), dma_address, size, (int)direction);
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}
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static inline int
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dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
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}
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static inline void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_unmap_sg(to_pci_dev(dev), sg, nhwentries, (int)direction);
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}
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static inline void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
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size, (int)direction);
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}
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static inline void
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dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
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size, (int)direction);
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg, nelems, (int)direction);
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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BUG_ON(dev->bus != &pci_bus_type);
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pci_dma_sync_sg_for_device(to_pci_dev(dev), sg, nelems, (int)direction);
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}
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static inline int
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dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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return pci_dma_mapping_error(to_pci_dev(dev), dma_addr);
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}
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#else
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static inline int
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dma_supported(struct device *dev, u64 mask)
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{
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return 0;
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}
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static inline int
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dma_set_mask(struct device *dev, u64 dma_mask)
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{
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BUG();
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return 0;
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}
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static inline void *
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dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t flag)
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{
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BUG();
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return NULL;
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}
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static inline void
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dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_handle)
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{
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BUG();
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}
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static inline dma_addr_t
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dma_map_single(struct device *dev, void *cpu_addr, size_t size,
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enum dma_data_direction direction)
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{
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BUG();
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return 0;
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}
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static inline void
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction)
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{
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BUG();
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}
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static inline dma_addr_t
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dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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BUG();
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return 0;
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}
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static inline void
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dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
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enum dma_data_direction direction)
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{
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BUG();
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}
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static inline int
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dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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BUG();
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return 0;
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}
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static inline void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
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enum dma_data_direction direction)
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{
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BUG();
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}
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static inline void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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BUG();
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}
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static inline void
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dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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BUG();
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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BUG();
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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BUG();
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}
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static inline int
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dma_error(dma_addr_t dma_addr)
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{
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return 0;
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}
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#endif
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/* Now for the API extensions over the pci_ one */
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#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
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#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
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#define dma_is_consistent(d, h) (1)
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static inline int
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dma_get_cache_alignment(void)
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{
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/* no easy way to get cache size on all processors, so return
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* the maximum possible, to be safe */
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return (1 << INTERNODE_CACHE_SHIFT);
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}
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static inline void
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dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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/* just sync everything, that's all the pci API can do */
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dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction);
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}
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static inline void
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dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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/* just sync everything, that's all the pci API can do */
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dma_sync_single_for_device(dev, dma_handle, offset+size, direction);
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}
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static inline void
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dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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/* could define this in terms of the dma_cache ... operations,
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* but if you get this on a platform, you should convert the platform
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* to using the generic device DMA API */
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BUG();
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}
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#endif
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