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05e4d316 PA |
1 | #ifndef _ASM_X86_XEN_PAGE_H |
2 | #define _ASM_X86_XEN_PAGE_H | |
20e71f2e | 3 | |
ecbf29cd JF |
4 | #include <linux/kernel.h> |
5 | #include <linux/types.h> | |
6 | #include <linux/spinlock.h> | |
20e71f2e | 7 | #include <linux/pfn.h> |
7e77506a | 8 | #include <linux/mm.h> |
20e71f2e IY |
9 | |
10 | #include <asm/uaccess.h> | |
ecbf29cd | 11 | #include <asm/page.h> |
20e71f2e IY |
12 | #include <asm/pgtable.h> |
13 | ||
ecbf29cd | 14 | #include <xen/interface/xen.h> |
0930bba6 | 15 | #include <xen/grant_table.h> |
20e71f2e IY |
16 | #include <xen/features.h> |
17 | ||
18 | /* Xen machine address */ | |
19 | typedef struct xmaddr { | |
20 | phys_addr_t maddr; | |
21 | } xmaddr_t; | |
22 | ||
23 | /* Xen pseudo-physical address */ | |
24 | typedef struct xpaddr { | |
25 | phys_addr_t paddr; | |
26 | } xpaddr_t; | |
27 | ||
28 | #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | |
29 | #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | |
30 | ||
31 | /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | |
32 | #define INVALID_P2M_ENTRY (~0UL) | |
f4cec35b KRW |
33 | #define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1)) |
34 | #define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2)) | |
20e71f2e | 35 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) |
f4cec35b | 36 | #define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT) |
20e71f2e | 37 | |
cb3eb850 JG |
38 | #define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long)) |
39 | ||
7e77506a | 40 | extern unsigned long *machine_to_phys_mapping; |
ccbcdf7c | 41 | extern unsigned long machine_to_phys_nr; |
5b8e7d80 JG |
42 | extern unsigned long *xen_p2m_addr; |
43 | extern unsigned long xen_p2m_size; | |
44 | extern unsigned long xen_max_p2m_pfn; | |
8006ec3e | 45 | |
d451bb7a | 46 | extern unsigned long get_phys_to_machine(unsigned long pfn); |
c3798062 | 47 | extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
6eaa412f | 48 | extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
cb3eb850 JG |
49 | extern unsigned long __init set_phys_range_identity(unsigned long pfn_s, |
50 | unsigned long pfn_e); | |
20e71f2e | 51 | |
1429d46d ZK |
52 | extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops, |
53 | struct gnttab_map_grant_ref *kmap_ops, | |
54 | struct page **pages, unsigned int count); | |
1429d46d | 55 | extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops, |
853d0289 | 56 | struct gnttab_unmap_grant_ref *kunmap_ops, |
1429d46d | 57 | struct page **pages, unsigned int count); |
448f2831 | 58 | |
90fff3ea JG |
59 | /* |
60 | * Helper functions to write or read unsigned long values to/from | |
61 | * memory, when the access may fault. | |
62 | */ | |
63 | static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val) | |
64 | { | |
65 | return __put_user(val, (unsigned long __user *)addr); | |
66 | } | |
67 | ||
68 | static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val) | |
69 | { | |
70 | return __get_user(*val, (unsigned long __user *)addr); | |
71 | } | |
72 | ||
0aad5689 JG |
73 | /* |
74 | * When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine(): | |
75 | * - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator | |
76 | * bits (identity or foreign) are set. | |
77 | * - __pfn_to_mfn() returns the found entry of the p2m table. A possibly set | |
78 | * identity or foreign indicator will be still set. __pfn_to_mfn() is | |
054954eb JG |
79 | * encapsulating get_phys_to_machine() which is called in special cases only. |
80 | * - get_phys_to_machine() is to be called by __pfn_to_mfn() only in special | |
81 | * cases needing an extended handling. | |
0aad5689 JG |
82 | */ |
83 | static inline unsigned long __pfn_to_mfn(unsigned long pfn) | |
84 | { | |
054954eb JG |
85 | unsigned long mfn; |
86 | ||
87 | if (pfn < xen_p2m_size) | |
88 | mfn = xen_p2m_addr[pfn]; | |
89 | else if (unlikely(pfn < xen_max_p2m_pfn)) | |
90 | return get_phys_to_machine(pfn); | |
91 | else | |
92 | return IDENTITY_FRAME(pfn); | |
93 | ||
94 | if (unlikely(mfn == INVALID_P2M_ENTRY)) | |
95 | return get_phys_to_machine(pfn); | |
96 | ||
97 | return mfn; | |
0aad5689 JG |
98 | } |
99 | ||
20e71f2e IY |
100 | static inline unsigned long pfn_to_mfn(unsigned long pfn) |
101 | { | |
cfd8951e JF |
102 | unsigned long mfn; |
103 | ||
20e71f2e IY |
104 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
105 | return pfn; | |
106 | ||
0aad5689 | 107 | mfn = __pfn_to_mfn(pfn); |
cfd8951e JF |
108 | |
109 | if (mfn != INVALID_P2M_ENTRY) | |
f4cec35b | 110 | mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT); |
cfd8951e JF |
111 | |
112 | return mfn; | |
20e71f2e IY |
113 | } |
114 | ||
115 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
116 | { | |
117 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
118 | return 1; | |
119 | ||
0aad5689 | 120 | return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY; |
20e71f2e IY |
121 | } |
122 | ||
0160676b | 123 | static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn) |
20e71f2e IY |
124 | { |
125 | unsigned long pfn; | |
0160676b | 126 | int ret; |
20e71f2e IY |
127 | |
128 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
129 | return mfn; | |
130 | ||
0160676b DV |
131 | if (unlikely(mfn >= machine_to_phys_nr)) |
132 | return ~0; | |
133 | ||
20e71f2e IY |
134 | /* |
135 | * The array access can fail (e.g., device space beyond end of RAM). | |
136 | * In such cases it doesn't matter what we return (we return garbage), | |
137 | * but we must handle the fault without crashing! | |
138 | */ | |
90fff3ea | 139 | ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn); |
706cc9d2 | 140 | if (ret < 0) |
0160676b DV |
141 | return ~0; |
142 | ||
143 | return pfn; | |
144 | } | |
145 | ||
146 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
147 | { | |
148 | unsigned long pfn; | |
149 | ||
150 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
151 | return mfn; | |
152 | ||
153 | pfn = mfn_to_pfn_no_overrides(mfn); | |
0bb599fd DV |
154 | if (__pfn_to_mfn(pfn) != mfn) |
155 | pfn = ~0; | |
706cc9d2 | 156 | |
1429d46d | 157 | /* |
0bb599fd DV |
158 | * pfn is ~0 if there are no entries in the m2p for mfn or the |
159 | * entry doesn't map back to the mfn. | |
448f2831 | 160 | */ |
0aad5689 | 161 | if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn)) |
706cc9d2 | 162 | pfn = mfn; |
448f2831 | 163 | |
20e71f2e IY |
164 | return pfn; |
165 | } | |
166 | ||
167 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
168 | { | |
169 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
947d0496 | 170 | return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); |
20e71f2e IY |
171 | } |
172 | ||
173 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
174 | { | |
175 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
947d0496 | 176 | return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); |
20e71f2e IY |
177 | } |
178 | ||
179 | /* | |
180 | * We detect special mappings in one of two ways: | |
181 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
182 | * to be outside our maximum possible pseudophys range. | |
183 | * 2. If the MFN belongs to a different domain then we will certainly | |
184 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
185 | * then we'll have p2m(m2p(MFN))==MFN. | |
186 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
187 | * We force !pfn_valid() by returning an out-of-range pointer. | |
188 | * | |
189 | * NB. These checks require that, for any MFN that is not in our reservation, | |
190 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
191 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
192 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
193 | * | |
194 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
195 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
196 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
197 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
198 | */ | |
199 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
200 | { | |
fc590efe MR |
201 | unsigned long pfn; |
202 | ||
203 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
204 | return mfn; | |
205 | ||
206 | pfn = mfn_to_pfn(mfn); | |
0aad5689 | 207 | if (__pfn_to_mfn(pfn) != mfn) |
c0011dbf | 208 | return -1; /* force !pfn_valid() */ |
20e71f2e IY |
209 | return pfn; |
210 | } | |
211 | ||
20e71f2e IY |
212 | /* VIRT <-> MACHINE conversion */ |
213 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
b40bf53e AN |
214 | #define virt_to_pfn(v) (PFN_DOWN(__pa(v))) |
215 | #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) | |
20e71f2e IY |
216 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) |
217 | ||
218 | static inline unsigned long pte_mfn(pte_t pte) | |
219 | { | |
59438c9f | 220 | return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; |
20e71f2e IY |
221 | } |
222 | ||
223 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
224 | { | |
225 | pte_t pte; | |
226 | ||
227 | pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | |
b534816b | 228 | massage_pgprot(pgprot); |
20e71f2e IY |
229 | |
230 | return pte; | |
231 | } | |
232 | ||
233 | static inline pteval_t pte_val_ma(pte_t pte) | |
234 | { | |
235 | return pte.pte; | |
236 | } | |
237 | ||
238 | static inline pte_t __pte_ma(pteval_t x) | |
239 | { | |
240 | return (pte_t) { .pte = x }; | |
241 | } | |
242 | ||
20e71f2e | 243 | #define pmd_val_ma(v) ((v).pmd) |
f6e58732 | 244 | #ifdef __PAGETABLE_PUD_FOLDED |
20e71f2e | 245 | #define pud_val_ma(v) ((v).pgd.pgd) |
f6e58732 JF |
246 | #else |
247 | #define pud_val_ma(v) ((v).pud) | |
248 | #endif | |
20e71f2e | 249 | #define __pmd_ma(x) ((pmd_t) { (x) } ) |
20e71f2e IY |
250 | |
251 | #define pgd_val_ma(x) ((x).pgd) | |
252 | ||
eba3ff8b | 253 | void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid); |
20e71f2e | 254 | |
ce803e70 | 255 | xmaddr_t arbitrary_virt_to_machine(void *address); |
9976b39b | 256 | unsigned long arbitrary_virt_to_mfn(void *vaddr); |
20e71f2e IY |
257 | void make_lowmem_page_readonly(void *vaddr); |
258 | void make_lowmem_page_readwrite(void *vaddr); | |
259 | ||
3216dceb | 260 | #define xen_remap(cookie, size) ioremap((cookie), (size)); |
efaf30a3 | 261 | #define xen_unmap(cookie) iounmap((cookie)) |
3216dceb | 262 | |
a4dba130 SS |
263 | static inline bool xen_arch_need_swiotlb(struct device *dev, |
264 | unsigned long pfn, | |
265 | unsigned long mfn) | |
266 | { | |
267 | return false; | |
268 | } | |
269 | ||
8746515d SS |
270 | static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order) |
271 | { | |
272 | return __get_free_pages(__GFP_NOWARN, order); | |
273 | } | |
274 | ||
05e4d316 | 275 | #endif /* _ASM_X86_XEN_PAGE_H */ |