Linux Kernel  3.7.1
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iommu_common.h
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1 /* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
2  *
3  * Copyright (C) 1999, 2008 David S. Miller ([email protected])
4  */
5 
6 #ifndef _IOMMU_COMMON_H
7 #define _IOMMU_COMMON_H
8 
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/scatterlist.h>
14 #include <linux/device.h>
15 #include <linux/iommu-helper.h>
16 
17 #include <asm/iommu.h>
18 #include <asm/scatterlist.h>
19 
20 /*
21  * These give mapping size of each iommu pte/tlb.
22  */
23 #define IO_PAGE_SHIFT 13
24 #define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
25 #define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
26 #define IO_PAGE_ALIGN(addr) ALIGN(addr, IO_PAGE_SIZE)
27 
28 #define IO_TSB_ENTRIES (128*1024)
29 #define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
30 
31 /*
32  * This is the hardwired shift in the iotlb tag/data parts.
33  */
34 #define IOMMU_PAGE_SHIFT 13
35 
36 #define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
37 
38 static inline int is_span_boundary(unsigned long entry,
39  unsigned long shift,
40  unsigned long boundary_size,
41  struct scatterlist *outs,
42  struct scatterlist *sg)
43 {
44  unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
45  int nr = iommu_num_pages(paddr, outs->dma_length + sg->length,
46  IO_PAGE_SIZE);
47 
48  return iommu_is_span_boundary(entry, nr, shift, boundary_size);
49 }
50 
51 extern unsigned long iommu_range_alloc(struct device *dev,
52  struct iommu *iommu,
53  unsigned long npages,
54  unsigned long *handle);
55 extern void iommu_range_free(struct iommu *iommu,
57  unsigned long npages);
58 
59 #endif /* _IOMMU_COMMON_H */