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 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 */ 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) \ 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. */ 90 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr) 91 { 92 BUG(); 93 } 94 95 extern 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 99 extern 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); 102 103 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); 104 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn, 105 unsigned long nr_pages); 106 107 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 108 { 109 return __set_phys_to_machine(pfn, mfn); 110 } 111 112 bool 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