LXR linux/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 */
  18typedef struct xmaddr {
  19        phys_addr_t maddr;
  20} xmaddr_t;
  21
  22/* Xen pseudo-physical address */
  23typedef 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
  43unsigned long __pfn_to_mfn(unsigned long pfn);
  44extern struct rb_root phys_to_mach;
  45
  46/* Pseudo-physical <-> Guest conversion */
  47static inline unsigned long pfn_to_gfn(unsigned long pfn)
  48{
  49        return pfn;
  50}
  51
  52static inline unsigned long gfn_to_pfn(unsigned long gfn)
  53{
  54        return gfn;
  55}
  56
  57/* Pseudo-physical <-> BUS conversion */
  58static 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
  71static 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. */
  83static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
  84{
  85        BUG();
  86}
  87
  88extern 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
  92extern 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
  96bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
  97bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
  98                unsigned long nr_pages);
  99
 100static 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
 108bool xen_arch_need_swiotlb(struct device *dev,
 109                           phys_addr_t phys,
 110                           dma_addr_t dev_addr);
 111unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 112
 113#endif /* _ASM_ARM_XEN_PAGE_H */
 114