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 16/* Xen machine address */ 17typedef struct xmaddr { 18 phys_addr_t maddr; 19} xmaddr_t; 20 21/* Xen pseudo-physical address */ 22typedef struct xpaddr { 23 phys_addr_t paddr; 24} xpaddr_t; 25 26#define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) 27#define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) 28 29#define INVALID_P2M_ENTRY (~0UL) 30 31/* 32 * The pseudo-physical frame (pfn) used in all the helpers is always based 33 * on Xen page granularity (i.e 4KB). 34 * 35 * A Linux page may be split across multiple non-contiguous Xen page so we 36 * have to keep track with frame based on 4KB page granularity. 37 * 38 * PV drivers should never make a direct usage of those helpers (particularly 39 * pfn_to_gfn and gfn_to_pfn). 40 */ 41 42unsigned long __pfn_to_mfn(unsigned long pfn); 43extern struct rb_root phys_to_mach; 44 45/* Pseudo-physical <-> Guest conversion */ 46static inline unsigned long pfn_to_gfn(unsigned long pfn) 47{ 48 return pfn; 49} 50 51static inline unsigned long gfn_to_pfn(unsigned long gfn) 52{ 53 return gfn; 54} 55 56/* Pseudo-physical <-> BUS conversion */ 57static inline unsigned long pfn_to_bfn(unsigned long pfn) 58{ 59 unsigned long mfn; 60 61 if (phys_to_mach.rb_node != NULL) { 62 mfn = __pfn_to_mfn(pfn); 63 if (mfn != INVALID_P2M_ENTRY) 64 return mfn; 65 } 66 67 return pfn; 68} 69 70static inline unsigned long bfn_to_pfn(unsigned long bfn) 71{ 72 return bfn; 73} 74 75#define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn) 76 77/* VIRT <-> GUEST conversion */ 78#define virt_to_gfn(v) (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT)) 79#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT)) 80 81/* Only used in PV code. But ARM guests are always HVM. */ 82static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr) 83{ 84 BUG(); 85} 86 87/* TODO: this shouldn't be here but it is because the frontend drivers 88 * are using it (its rolled in headers) even though we won't hit the code path. 89 * So for right now just punt with this. 90 */ 91static inline pte_t *lookup_address(unsigned long address, unsigned int *level) 92{ 93 BUG(); 94 return NULL; 95} 96 97extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops, 98 struct gnttab_map_grant_ref *kmap_ops, 99 struct page **pages, unsigned int count); 100 101extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops, 102 struct gnttab_unmap_grant_ref *kunmap_ops, 103 struct page **pages, unsigned int count); 104 105bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); 106bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn, 107 unsigned long nr_pages); 108 109static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 110{ 111 return __set_phys_to_machine(pfn, mfn); 112} 113 114#define xen_remap(cookie, size) ioremap_cache((cookie), (size)) 115#define xen_unmap(cookie) iounmap((cookie)) 116 117bool xen_arch_need_swiotlb(struct device *dev, 118 phys_addr_t phys, 119 dma_addr_t dev_addr); 120unsigned long xen_get_swiotlb_free_pages(unsigned int order); 121 122#endif /* _ASM_ARM_XEN_PAGE_H */ 123