arch/arm/include/asm/xen/page.h

   1 #ifndef _ASM_ARM_XEN_PAGE_H
   2 #define _ASM_ARM_XEN_PAGE_H
   3
   4 #include <asm/page.h>
   5 #include <asm/pgtable.h>
   6
   7 #include <linux/pfn.h>
   8 #include <linux/types.h>
   9 #include <linux/dma-mapping.h>
  10
  11 #include <xen/xen.h>
  12 #include <xen/interface/grant_table.h>
  13
  14 #define phys_to_machine_mapping_valid(pfn) (1)
  15
  16 /* Xen machine address */
  17 typedef struct xmaddr {
  18         phys_addr_t maddr;
  19 } xmaddr_t;
  20
  21 /* Xen pseudo-physical address */
  22 typedef struct xpaddr {
  23         phys_addr_t paddr;
  24 } xpaddr_t;
  25
  26 #define XMADDR(x)       ((xmaddr_t) { .maddr = (x) })
  27 #define XPADDR(x)       ((xpaddr_t) { .paddr = (x) })
  28
  29 #define INVALID_P2M_ENTRY      (~0UL)
  30
  31 /*
  32  * The pseudo-physical frame (pfn) used in all the helpers is always based
  33  * on Xen page granularity (i.e 4KB).
  34  *
  35  * A Linux page may be split across multiple non-contiguous Xen page so we
  36  * have to keep track with frame based on 4KB page granularity.
  37  *
  38  * PV drivers should never make a direct usage of those helpers (particularly
  39  * pfn_to_gfn and gfn_to_pfn).
  40  */
  41
  42 unsigned long __pfn_to_mfn(unsigned long pfn);
  43 extern struct rb_root phys_to_mach;
  44
  45 /* Pseudo-physical <-> Guest conversion */
  46 static inline unsigned long pfn_to_gfn(unsigned long pfn)
  47 {
  48         return pfn;
  49 }
  50
  51 static inline unsigned long gfn_to_pfn(unsigned long gfn)
  52 {
  53         return gfn;
  54 }
  55
  56 /* Pseudo-physical <-> BUS conversion */
  57 static inline unsigned long pfn_to_bfn(unsigned long pfn)
  58 {
  59         unsigned long mfn;
  60
  61         if (phys_to_mach.rb_node != NULL) {
  62                 mfn = __pfn_to_mfn(pfn);
  63                 if (mfn != INVALID_P2M_ENTRY)
  64                         return mfn;
  65         }
  66
  67         return pfn;
  68 }
  69
  70 static inline unsigned long bfn_to_pfn(unsigned long bfn)
  71 {
  72         return bfn;
  73 }
  74
  75 #define bfn_to_local_pfn(bfn)   bfn_to_pfn(bfn)
  76
  77 /* VIRT <-> GUEST conversion */
  78 #define virt_to_gfn(v)          (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
  79 #define gfn_to_virt(m)          (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
  80
  81 /* Only used in PV code. But ARM guests are always HVM. */
  82 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
  83 {
  84         BUG();
  85 }
  86
  87 /* TODO: this shouldn't be here but it is because the frontend drivers
  88  * are using it (its rolled in headers) even though we won't hit the code path.
  89  * So for right now just punt with this.
  90  */
  91 static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
  92 {
  93         BUG();
  94         return NULL;
  95 }
  96
  97 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
  98                                    struct gnttab_map_grant_ref *kmap_ops,
  99                                    struct page **pages, unsigned int count);
 100
 101 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
 102                                      struct gnttab_unmap_grant_ref *kunmap_ops,
 103                                      struct page **pages, unsigned int count);
 104
 105 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
 106 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
 107                 unsigned long nr_pages);
 108
 109 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 110 {
 111         return __set_phys_to_machine(pfn, mfn);
 112 }
 113
 114 #define xen_remap(cookie, size) ioremap_cache((cookie), (size))
 115 #define xen_unmap(cookie) iounmap((cookie))
 116
 117 bool xen_arch_need_swiotlb(struct device *dev,
 118                            phys_addr_t phys,
 119                            dma_addr_t dev_addr);
 120 unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 121
 122 #endif /* _ASM_ARM_XEN_PAGE_H */