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 #define pte_mfn     pte_pfn
  17 #define mfn_pte     pfn_pte
  18
  19 /* Xen machine address */
  20 typedef struct xmaddr {
  21         phys_addr_t maddr;
  22 } xmaddr_t;
  23
  24 /* Xen pseudo-physical address */
  25 typedef struct xpaddr {
  26         phys_addr_t paddr;
  27 } xpaddr_t;
  28
  29 #define XMADDR(x)       ((xmaddr_t) { .maddr = (x) })
  30 #define XPADDR(x)       ((xpaddr_t) { .paddr = (x) })
  31
  32 #define INVALID_P2M_ENTRY      (~0UL)
  33
  34 unsigned long __pfn_to_mfn(unsigned long pfn);
  35 extern struct rb_root phys_to_mach;
  36
  37 static inline unsigned long pfn_to_mfn(unsigned long pfn)
  38 {
  39         unsigned long mfn;
  40
  41         if (phys_to_mach.rb_node != NULL) {
  42                 mfn = __pfn_to_mfn(pfn);
  43                 if (mfn != INVALID_P2M_ENTRY)
  44                         return mfn;
  45         }
  46
  47         return pfn;
  48 }
  49
  50 static inline unsigned long mfn_to_pfn(unsigned long mfn)
  51 {
  52         return mfn;
  53 }
  54
  55 #define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)
  56
  57 static inline xmaddr_t phys_to_machine(xpaddr_t phys)
  58 {
  59         unsigned offset = phys.paddr & ~PAGE_MASK;
  60         return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
  61 }
  62
  63 static inline xpaddr_t machine_to_phys(xmaddr_t machine)
  64 {
  65         unsigned offset = machine.maddr & ~PAGE_MASK;
  66         return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
  67 }
  68 /* VIRT <-> MACHINE conversion */
  69 #define virt_to_machine(v)      (phys_to_machine(XPADDR(__pa(v))))
  70 #define virt_to_mfn(v)          (pfn_to_mfn(virt_to_pfn(v)))
  71 #define mfn_to_virt(m)          (__va(mfn_to_pfn(m) << PAGE_SHIFT))
  72
  73 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
  74 {
  75         /* TODO: assuming it is mapped in the kernel 1:1 */
  76         return virt_to_machine(vaddr);
  77 }
  78
  79 /* TODO: this shouldn't be here but it is because the frontend drivers
  80  * are using it (its rolled in headers) even though we won't hit the code path.
  81  * So for right now just punt with this.
  82  */
  83 static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
  84 {
  85         BUG();
  86         return NULL;
  87 }
  88
  89 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
  90                                    struct gnttab_map_grant_ref *kmap_ops,
  91                                    struct page **pages, unsigned int count);
  92
  93 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
  94                                      struct gnttab_unmap_grant_ref *kunmap_ops,
  95                                      struct page **pages, unsigned int count);
  96
  97 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
  98 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
  99                 unsigned long nr_pages);
 100
 101 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 102 {
 103         return __set_phys_to_machine(pfn, mfn);
 104 }
 105
 106 #define xen_remap(cookie, size) ioremap_cache((cookie), (size))
 107 #define xen_unmap(cookie) iounmap((cookie))
 108
 109 bool xen_arch_need_swiotlb(struct device *dev,
 110                            unsigned long pfn,
 111                            unsigned long mfn);
 112 unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 113
 114 #endif /* _ASM_ARM_XEN_PAGE_H */