![FUJITA Tomonori](/assets/img/avatar_default.png)
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>
254 lines
8 KiB
C
254 lines
8 KiB
C
#ifndef _PARISC_DMA_MAPPING_H
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#define _PARISC_DMA_MAPPING_H
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#include <linux/mm.h>
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#include <asm/cacheflush.h>
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#include <asm/scatterlist.h>
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/* See Documentation/DMA-mapping.txt */
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struct hppa_dma_ops {
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int (*dma_supported)(struct device *dev, u64 mask);
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void *(*alloc_consistent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
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void *(*alloc_noncoherent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
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void (*free_consistent)(struct device *dev, size_t size, void *vaddr, dma_addr_t iova);
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dma_addr_t (*map_single)(struct device *dev, void *addr, size_t size, enum dma_data_direction direction);
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void (*unmap_single)(struct device *dev, dma_addr_t iova, size_t size, enum dma_data_direction direction);
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int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction);
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void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nhwents, enum dma_data_direction direction);
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void (*dma_sync_single_for_cpu)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
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void (*dma_sync_single_for_device)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
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void (*dma_sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
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void (*dma_sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
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};
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/*
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** We could live without the hppa_dma_ops indirection if we didn't want
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** to support 4 different coherent dma models with one binary (they will
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** someday be loadable modules):
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** I/O MMU consistent method dma_sync behavior
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** ============= ====================== =======================
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** a) PA-7x00LC uncachable host memory flush/purge
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** b) U2/Uturn cachable host memory NOP
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** c) Ike/Astro cachable host memory NOP
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** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
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**
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** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
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**
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** Systems (eg PCX-T workstations) that don't fall into the above
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** categories will need to modify the needed drivers to perform
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** flush/purge and allocate "regular" cacheable pages for everything.
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*/
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#ifdef CONFIG_PA11
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extern struct hppa_dma_ops pcxl_dma_ops;
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extern struct hppa_dma_ops pcx_dma_ops;
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#endif
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extern struct hppa_dma_ops *hppa_dma_ops;
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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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return hppa_dma_ops->alloc_consistent(dev, size, dma_handle, flag);
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}
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static inline void *
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dma_alloc_noncoherent(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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return hppa_dma_ops->alloc_noncoherent(dev, size, dma_handle, flag);
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}
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static inline void
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dma_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
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}
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static inline void
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dma_free_noncoherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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hppa_dma_ops->free_consistent(dev, size, vaddr, 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 *ptr, size_t size,
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enum dma_data_direction direction)
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{
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return hppa_dma_ops->map_single(dev, ptr, size, 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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hppa_dma_ops->unmap_single(dev, dma_addr, size, 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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return hppa_dma_ops->map_sg(dev, sg, nents, 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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hppa_dma_ops->unmap_sg(dev, sg, nhwentries, 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, unsigned long offset,
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size_t size, enum dma_data_direction direction)
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{
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return dma_map_single(dev, (page_address(page) + (offset)), size, 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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dma_unmap_single(dev, dma_address, size, 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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if(hppa_dma_ops->dma_sync_single_for_cpu)
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hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, 0, size, 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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if(hppa_dma_ops->dma_sync_single_for_device)
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hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, 0, size, direction);
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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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if(hppa_dma_ops->dma_sync_single_for_cpu)
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hppa_dma_ops->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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if(hppa_dma_ops->dma_sync_single_for_device)
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hppa_dma_ops->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_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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if(hppa_dma_ops->dma_sync_sg_for_cpu)
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hppa_dma_ops->dma_sync_sg_for_cpu(dev, sg, nelems, 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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if(hppa_dma_ops->dma_sync_sg_for_device)
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hppa_dma_ops->dma_sync_sg_for_device(dev, sg, nelems, direction);
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}
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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 hppa_dma_ops->dma_supported(dev, mask);
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}
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static inline int
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dma_set_mask(struct device *dev, u64 mask)
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{
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if(!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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static inline int
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dma_get_cache_alignment(void)
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{
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return dcache_stride;
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}
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static inline int
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dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
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{
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return (hppa_dma_ops->dma_sync_single_for_cpu == NULL);
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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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if(hppa_dma_ops->dma_sync_single_for_cpu)
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flush_kernel_dcache_range((unsigned long)vaddr, size);
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}
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static inline void *
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parisc_walk_tree(struct device *dev)
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{
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struct device *otherdev;
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if(likely(dev->platform_data != NULL))
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return dev->platform_data;
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/* OK, just traverse the bus to find it */
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for(otherdev = dev->parent; otherdev;
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otherdev = otherdev->parent) {
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if(otherdev->platform_data) {
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dev->platform_data = otherdev->platform_data;
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break;
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}
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}
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BUG_ON(!dev->platform_data);
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return dev->platform_data;
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}
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#define GET_IOC(dev) (HBA_DATA(parisc_walk_tree(dev))->iommu);
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#ifdef CONFIG_IOMMU_CCIO
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struct parisc_device;
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struct ioc;
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void * ccio_get_iommu(const struct parisc_device *dev);
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int ccio_request_resource(const struct parisc_device *dev,
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struct resource *res);
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int ccio_allocate_resource(const struct parisc_device *dev,
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struct resource *res, unsigned long size,
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unsigned long min, unsigned long max, unsigned long align);
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#else /* !CONFIG_IOMMU_CCIO */
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#define ccio_get_iommu(dev) NULL
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#define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
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#define ccio_allocate_resource(dev, res, size, min, max, align) \
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allocate_resource(&iomem_resource, res, size, min, max, \
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align, NULL, NULL)
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#endif /* !CONFIG_IOMMU_CCIO */
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#ifdef CONFIG_IOMMU_SBA
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struct parisc_device;
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void * sba_get_iommu(struct parisc_device *dev);
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#endif
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/* At the moment, we panic on error for IOMMU resource exaustion */
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#define dma_mapping_error(dev, x) 0
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#endif
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