include/xen/arm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_ARM_XEN_PAGE_H
   3 #define _ASM_ARM_XEN_PAGE_H
   4
   5 #include <asm/page.h>
   6 #include <asm/pgtable.h>
   7
   8 #include <linux/pfn.h>
   9 #include <linux/types.h>
  10 #include <linux/dma-mapping.h>
  11
  12 #include <xen/xen.h>
  13 #include <xen/interface/grant_table.h>
  14
  15 #define phys_to_machine_mapping_valid(pfn) (1)
  16
  17 /* Xen machine address */
  18 typedef struct xmaddr {
  19         phys_addr_t maddr;
  20 } xmaddr_t;
  21
  22 /* Xen pseudo-physical address */
  23 typedef struct xpaddr {
  24         phys_addr_t paddr;
  25 } xpaddr_t;
  26
  27 #define XMADDR(x)       ((xmaddr_t) { .maddr = (x) })
  28 #define XPADDR(x)       ((xpaddr_t) { .paddr = (x) })
  29
  30 #define INVALID_P2M_ENTRY      (~0UL)
  31
  32 /*
  33  * The pseudo-physical frame (pfn) used in all the helpers is always based
  34  * on Xen page granularity (i.e 4KB).
  35  *
  36  * A Linux page may be split across multiple non-contiguous Xen page so we
  37  * have to keep track with frame based on 4KB page granularity.
  38  *
  39  * PV drivers should never make a direct usage of those helpers (particularly
  40  * pfn_to_gfn and gfn_to_pfn).
  41  */
  42
  43 unsigned long __pfn_to_mfn(unsigned long pfn);
  44 extern struct rb_root phys_to_mach;
  45
  46 /* Pseudo-physical <-> Guest conversion */
  47 static inline unsigned long pfn_to_gfn(unsigned long pfn)
  48 {
  49         return pfn;
  50 }
  51
  52 static inline unsigned long gfn_to_pfn(unsigned long gfn)
  53 {
  54         return gfn;
  55 }
  56
  57 /* Pseudo-physical <-> BUS conversion */
  58 static inline unsigned long pfn_to_bfn(unsigned long pfn)
  59 {
  60         unsigned long mfn;
  61
  62         if (phys_to_mach.rb_node != NULL) {
  63                 mfn = __pfn_to_mfn(pfn);
  64                 if (mfn != INVALID_P2M_ENTRY)
  65                         return mfn;
  66         }
  67
  68         return pfn;
  69 }
  70
  71 static inline unsigned long bfn_to_pfn(unsigned long bfn)
  72 {
  73         return bfn;
  74 }
  75
  76 #define bfn_to_local_pfn(bfn)   bfn_to_pfn(bfn)
  77
  78 /* VIRT <-> GUEST conversion */
  79 #define virt_to_gfn(v)          (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
  80 #define gfn_to_virt(m)          (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
  81
  82 /* Only used in PV code. But ARM guests are always HVM. */
  83 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
  84 {
  85         BUG();
  86 }
  87
  88 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
  89                                    struct gnttab_map_grant_ref *kmap_ops,
  90                                    struct page **pages, unsigned int count);
  91
  92 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
  93                                      struct gnttab_unmap_grant_ref *kunmap_ops,
  94                                      struct page **pages, unsigned int count);
  95
  96 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
  97 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
  98                 unsigned long nr_pages);
  99
 100 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 101 {
 102         return __set_phys_to_machine(pfn, mfn);
 103 }
 104
 105 #define xen_remap(cookie, size) ioremap_cache((cookie), (size))
 106 #define xen_unmap(cookie) iounmap((cookie))
 107
 108 bool xen_arch_need_swiotlb(struct device *dev,
 109                            phys_addr_t phys,
 110                            dma_addr_t dev_addr);
 111 unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 112
 113 #endif /* _ASM_ARM_XEN_PAGE_H */