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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/init.h>
  7 #include <linux/gfp.h>
  8 #include <linux/pci.h>
  9 #include <linux/mm.h>
 10 
 11 #include <asm/processor.h>
 12 #include <asm/iommu.h>
 13 #include <asm/dma.h>
 14 
 15 static int
 16 check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
 17 {
 18         if (hwdev && !dma_capable(hwdev, bus, size)) {
 19                 if (*hwdev->dma_mask >= DMA_BIT_MASK(32))
 20                         printk(KERN_ERR
 21                             "nommu_%s: overflow %Lx+%zu of device mask %Lx\n",
 22                                 name, (long long)bus, size,
 23                                 (long long)*hwdev->dma_mask);
 24                 return 0;
 25         }
 26         return 1;
 27 }
 28 
 29 static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
 30                                  unsigned long offset, size_t size,
 31                                  enum dma_data_direction dir,
 32                                  struct dma_attrs *attrs)
 33 {
 34         dma_addr_t bus = page_to_phys(page) + offset;
 35         WARN_ON(size == 0);
 36         if (!check_addr("map_single", dev, bus, size))
 37                 return DMA_ERROR_CODE;
 38         flush_write_buffers();
 39         return bus;
 40 }
 41 
 42 /* Map a set of buffers described by scatterlist in streaming
 43  * mode for DMA.  This is the scatter-gather version of the
 44  * above pci_map_single interface.  Here the scatter gather list
 45  * elements are each tagged with the appropriate dma address
 46  * and length.  They are obtained via sg_dma_{address,length}(SG).
 47  *
 48  * NOTE: An implementation may be able to use a smaller number of
 49  *       DMA address/length pairs than there are SG table elements.
 50  *       (for example via virtual mapping capabilities)
 51  *       The routine returns the number of addr/length pairs actually
 52  *       used, at most nents.
 53  *
 54  * Device ownership issues as mentioned above for pci_map_single are
 55  * the same here.
 56  */
 57 static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
 58                         int nents, enum dma_data_direction dir,
 59                         struct dma_attrs *attrs)
 60 {
 61         struct scatterlist *s;
 62         int i;
 63 
 64         WARN_ON(nents == 0 || sg[0].length == 0);
 65 
 66         for_each_sg(sg, s, nents, i) {
 67                 BUG_ON(!sg_page(s));
 68                 s->dma_address = sg_phys(s);
 69                 if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
 70                         return 0;
 71                 s->dma_length = s->length;
 72         }
 73         flush_write_buffers();
 74         return nents;
 75 }
 76 
 77 static void nommu_sync_single_for_device(struct device *dev,
 78                         dma_addr_t addr, size_t size,
 79                         enum dma_data_direction dir)
 80 {
 81         flush_write_buffers();
 82 }
 83 
 84 
 85 static void nommu_sync_sg_for_device(struct device *dev,
 86                         struct scatterlist *sg, int nelems,
 87                         enum dma_data_direction dir)
 88 {
 89         flush_write_buffers();
 90 }
 91 
 92 struct dma_map_ops nommu_dma_ops = {
 93         .alloc                  = dma_generic_alloc_coherent,
 94         .free                   = dma_generic_free_coherent,
 95         .map_sg                 = nommu_map_sg,
 96         .map_page               = nommu_map_page,
 97         .sync_single_for_device = nommu_sync_single_for_device,
 98         .sync_sg_for_device     = nommu_sync_sg_for_device,
 99         .is_phys                = 1,
100 };
101 

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