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Linux/arch/x86/kernel/pci-nommu.c

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  1 /* Fallback functions when the main IOMMU code is not compiled in. This
  2    code is roughly equivalent to i386. */
  3 #include <linux/dma-mapping.h>
  4 #include <linux/scatterlist.h>
  5 #include <linux/string.h>
  6 #include <linux/gfp.h>
  7 #include <linux/pci.h>
  8 #include <linux/mm.h>
  9 
 10 #include <asm/processor.h>
 11 #include <asm/iommu.h>
 12 #include <asm/dma.h>
 13 
 14 static int
 15 check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
 16 {
 17         if (hwdev && !dma_capable(hwdev, bus, size)) {
 18                 if (*hwdev->dma_mask >= DMA_BIT_MASK(32))
 19                         printk(KERN_ERR
 20                             "nommu_%s: overflow %Lx+%zu of device mask %Lx\n",
 21                                 name, (long long)bus, size,
 22                                 (long long)*hwdev->dma_mask);
 23                 return 0;
 24         }
 25         return 1;
 26 }
 27 
 28 static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
 29                                  unsigned long offset, size_t size,
 30                                  enum dma_data_direction dir,
 31                                  struct dma_attrs *attrs)
 32 {
 33         dma_addr_t bus = page_to_phys(page) + offset;
 34         WARN_ON(size == 0);
 35         if (!check_addr("map_single", dev, bus, size))
 36                 return DMA_ERROR_CODE;
 37         flush_write_buffers();
 38         return bus;
 39 }
 40 
 41 /* Map a set of buffers described by scatterlist in streaming
 42  * mode for DMA.  This is the scatter-gather version of the
 43  * above pci_map_single interface.  Here the scatter gather list
 44  * elements are each tagged with the appropriate dma address
 45  * and length.  They are obtained via sg_dma_{address,length}(SG).
 46  *
 47  * NOTE: An implementation may be able to use a smaller number of
 48  *       DMA address/length pairs than there are SG table elements.
 49  *       (for example via virtual mapping capabilities)
 50  *       The routine returns the number of addr/length pairs actually
 51  *       used, at most nents.
 52  *
 53  * Device ownership issues as mentioned above for pci_map_single are
 54  * the same here.
 55  */
 56 static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
 57                         int nents, enum dma_data_direction dir,
 58                         struct dma_attrs *attrs)
 59 {
 60         struct scatterlist *s;
 61         int i;
 62 
 63         WARN_ON(nents == 0 || sg[0].length == 0);
 64 
 65         for_each_sg(sg, s, nents, i) {
 66                 BUG_ON(!sg_page(s));
 67                 s->dma_address = sg_phys(s);
 68                 if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
 69                         return 0;
 70                 s->dma_length = s->length;
 71         }
 72         flush_write_buffers();
 73         return nents;
 74 }
 75 
 76 static void nommu_sync_single_for_device(struct device *dev,
 77                         dma_addr_t addr, size_t size,
 78                         enum dma_data_direction dir)
 79 {
 80         flush_write_buffers();
 81 }
 82 
 83 
 84 static void nommu_sync_sg_for_device(struct device *dev,
 85                         struct scatterlist *sg, int nelems,
 86                         enum dma_data_direction dir)
 87 {
 88         flush_write_buffers();
 89 }
 90 
 91 struct dma_map_ops nommu_dma_ops = {
 92         .alloc                  = dma_generic_alloc_coherent,
 93         .free                   = dma_generic_free_coherent,
 94         .map_sg                 = nommu_map_sg,
 95         .map_page               = nommu_map_page,
 96         .sync_single_for_device = nommu_sync_single_for_device,
 97         .sync_sg_for_device     = nommu_sync_sg_for_device,
 98         .is_phys                = 1,
 99 };
100 

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