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Linux/arch/powerpc/kernel/dma-iommu.c

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  1 /*
  2  * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
  3  *
  4  * Provide default implementations of the DMA mapping callbacks for
  5  * busses using the iommu infrastructure
  6  */
  7 
  8 #include <asm/iommu.h>
  9 
 10 /*
 11  * Generic iommu implementation
 12  */
 13 
 14 /* Allocates a contiguous real buffer and creates mappings over it.
 15  * Returns the virtual address of the buffer and sets dma_handle
 16  * to the dma address (mapping) of the first page.
 17  */
 18 static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
 19                                       dma_addr_t *dma_handle, gfp_t flag)
 20 {
 21         return iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
 22                                     dma_handle, device_to_mask(dev), flag,
 23                                     dev_to_node(dev));
 24 }
 25 
 26 static void dma_iommu_free_coherent(struct device *dev, size_t size,
 27                                     void *vaddr, dma_addr_t dma_handle)
 28 {
 29         iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle);
 30 }
 31 
 32 /* Creates TCEs for a user provided buffer.  The user buffer must be
 33  * contiguous real kernel storage (not vmalloc).  The address passed here
 34  * comprises a page address and offset into that page. The dma_addr_t
 35  * returned will point to the same byte within the page as was passed in.
 36  */
 37 static dma_addr_t dma_iommu_map_page(struct device *dev, struct page *page,
 38                                      unsigned long offset, size_t size,
 39                                      enum dma_data_direction direction,
 40                                      struct dma_attrs *attrs)
 41 {
 42         return iommu_map_page(dev, get_iommu_table_base(dev), page, offset,
 43                               size, device_to_mask(dev), direction, attrs);
 44 }
 45 
 46 
 47 static void dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
 48                                  size_t size, enum dma_data_direction direction,
 49                                  struct dma_attrs *attrs)
 50 {
 51         iommu_unmap_page(get_iommu_table_base(dev), dma_handle, size, direction,
 52                          attrs);
 53 }
 54 
 55 
 56 static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
 57                             int nelems, enum dma_data_direction direction,
 58                             struct dma_attrs *attrs)
 59 {
 60         return iommu_map_sg(dev, get_iommu_table_base(dev), sglist, nelems,
 61                             device_to_mask(dev), direction, attrs);
 62 }
 63 
 64 static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
 65                 int nelems, enum dma_data_direction direction,
 66                 struct dma_attrs *attrs)
 67 {
 68         iommu_unmap_sg(get_iommu_table_base(dev), sglist, nelems, direction,
 69                        attrs);
 70 }
 71 
 72 /* We support DMA to/from any memory page via the iommu */
 73 static int dma_iommu_dma_supported(struct device *dev, u64 mask)
 74 {
 75         struct iommu_table *tbl = get_iommu_table_base(dev);
 76 
 77         if (!tbl || tbl->it_offset > mask) {
 78                 printk(KERN_INFO
 79                        "Warning: IOMMU offset too big for device mask\n");
 80                 if (tbl)
 81                         printk(KERN_INFO
 82                                "mask: 0x%08llx, table offset: 0x%08lx\n",
 83                                 mask, tbl->it_offset);
 84                 else
 85                         printk(KERN_INFO "mask: 0x%08llx, table unavailable\n",
 86                                 mask);
 87                 return 0;
 88         } else
 89                 return 1;
 90 }
 91 
 92 struct dma_map_ops dma_iommu_ops = {
 93         .alloc_coherent = dma_iommu_alloc_coherent,
 94         .free_coherent  = dma_iommu_free_coherent,
 95         .map_sg         = dma_iommu_map_sg,
 96         .unmap_sg       = dma_iommu_unmap_sg,
 97         .dma_supported  = dma_iommu_dma_supported,
 98         .map_page       = dma_iommu_map_page,
 99         .unmap_page     = dma_iommu_unmap_page,
100 };
101 EXPORT_SYMBOL(dma_iommu_ops);
102 

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