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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _ASM_ARM_XEN_PAGE_H3#define _ASM_ARM_XEN_PAGE_H4 5#include <asm/page.h>6 7#include <linux/pfn.h>8#include <linux/types.h>9#include <linux/dma-mapping.h>10#include <linux/pgtable.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 based34 * on Xen page granularity (i.e 4KB).35 *36 * A Linux page may be split across multiple non-contiguous Xen page so we37 * have to keep track with frame based on 4KB page granularity.38 *39 * PV drivers should never make a direct usage of those helpers (particularly40 * 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) \80 ({ \81 WARN_ON_ONCE(!virt_addr_valid(v)); \82 pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT); \83 })84#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))85 86#define percpu_to_gfn(v) \87 (pfn_to_gfn(per_cpu_ptr_to_phys(v) >> XEN_PAGE_SHIFT))88 89/* Only used in PV code. But ARM guests are always HVM. */90static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)91{92 BUG();93}94 95extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,96 struct gnttab_map_grant_ref *kmap_ops,97 struct page **pages, unsigned int count);98 99extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,100 struct gnttab_unmap_grant_ref *kunmap_ops,101 struct page **pages, unsigned int count);102 103bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);104bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,105 unsigned long nr_pages);106 107static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)108{109 return __set_phys_to_machine(pfn, mfn);110}111 112bool xen_arch_need_swiotlb(struct device *dev,113 phys_addr_t phys,114 dma_addr_t dev_addr);115 116#endif /* _ASM_ARM_XEN_PAGE_H */117