1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
*
* Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
*/
#ifndef _IOMMU_COMMON_H
#define _IOMMU_COMMON_H
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/device.h>
#include <asm/iommu.h>
#include <asm/scatterlist.h>
/*
* These give mapping size of each iommu pte/tlb.
*/
#define IO_PAGE_SHIFT 13
#define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
#define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
#define IO_PAGE_ALIGN(addr) (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
#define IO_TSB_ENTRIES (128*1024)
#define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
/*
* This is the hardwired shift in the iotlb tag/data parts.
*/
#define IOMMU_PAGE_SHIFT 13
#define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
static inline unsigned long iommu_num_pages(unsigned long vaddr,
unsigned long slen)
{
unsigned long npages;
npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
npages >>= IO_PAGE_SHIFT;
return npages;
}
static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
{
unsigned long i, npages = 0;
struct scatterlist *sg;
for_each_sg(sglist, sg, nelems, i) {
unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
npages += iommu_num_pages(paddr, sg->length);
}
return npages;
}
extern unsigned long iommu_range_alloc(struct device *dev,
struct iommu *iommu,
unsigned long npages,
unsigned long *handle);
extern void iommu_range_free(struct iommu *iommu,
dma_addr_t dma_addr,
unsigned long npages);
#endif /* _IOMMU_COMMON_H */
|
