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 #define mfn_to_virt(m)                  (__va(mfn_to_pfn(m) << PAGE_SHIFT))
  16
  17 #define pte_mfn     pte_pfn
  18 #define mfn_pte     pfn_pte
  19
  20 /* Xen machine address */
  21 typedef struct xmaddr {
  22         phys_addr_t maddr;
  23 } xmaddr_t;
  24
  25 /* Xen pseudo-physical address */
  26 typedef struct xpaddr {
  27         phys_addr_t paddr;
  28 } xpaddr_t;
  29
  30 #define XMADDR(x)       ((xmaddr_t) { .maddr = (x) })
  31 #define XPADDR(x)       ((xpaddr_t) { .paddr = (x) })
  32
  33 #define INVALID_P2M_ENTRY      (~0UL)
  34
  35 unsigned long __pfn_to_mfn(unsigned long pfn);
  36 extern struct rb_root phys_to_mach;
  37
  38 static inline unsigned long pfn_to_mfn(unsigned long pfn)
  39 {
  40         unsigned long mfn;
  41
  42         if (phys_to_mach.rb_node != NULL) {
  43                 mfn = __pfn_to_mfn(pfn);
  44                 if (mfn != INVALID_P2M_ENTRY)
  45                         return mfn;
  46         }
  47
  48         return pfn;
  49 }
  50
  51 static inline unsigned long mfn_to_pfn(unsigned long mfn)
  52 {
  53         return mfn;
  54 }
  55
  56 #define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)
  57
  58 static inline xmaddr_t phys_to_machine(xpaddr_t phys)
  59 {
  60         unsigned offset = phys.paddr & ~PAGE_MASK;
  61         return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
  62 }
  63
  64 static inline xpaddr_t machine_to_phys(xmaddr_t machine)
  65 {
  66         unsigned offset = machine.maddr & ~PAGE_MASK;
  67         return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
  68 }
  69 /* VIRT <-> MACHINE conversion */
  70 #define virt_to_machine(v)      (phys_to_machine(XPADDR(__pa(v))))
  71 #define virt_to_mfn(v)          (pfn_to_mfn(virt_to_pfn(v)))
  72 #define mfn_to_virt(m)          (__va(mfn_to_pfn(m) << PAGE_SHIFT))
  73
  74 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
  75 {
  76         /* TODO: assuming it is mapped in the kernel 1:1 */
  77         return virt_to_machine(vaddr);
  78 }
  79
  80 /* TODO: this shouldn't be here but it is because the frontend drivers
  81  * are using it (its rolled in headers) even though we won't hit the code path.
  82  * So for right now just punt with this.
  83  */
  84 static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
  85 {
  86         BUG();
  87         return NULL;
  88 }
  89
  90 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
  91                                    struct gnttab_map_grant_ref *kmap_ops,
  92                                    struct page **pages, unsigned int count);
  93
  94 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
  95                                      struct gnttab_unmap_grant_ref *kunmap_ops,
  96                                      struct page **pages, unsigned int count);
  97
  98 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
  99 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
 100                 unsigned long nr_pages);
 101
 102 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 103 {
 104         return __set_phys_to_machine(pfn, mfn);
 105 }
 106
 107 #define xen_remap(cookie, size) ioremap_cache((cookie), (size))
 108 #define xen_unmap(cookie) iounmap((cookie))
 109
 110 bool xen_arch_need_swiotlb(struct device *dev,
 111                            unsigned long pfn,
 112                            unsigned long mfn);
 113 unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 114
 115 #endif /* _ASM_ARM_XEN_PAGE_H */