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3ae07890 AG |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License, version 2, as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License | |
12 | * along with this program; if not, write to the Free Software | |
13 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
14 | * | |
15 | * Copyright SUSE Linux Products GmbH 2010 | |
16 | * | |
17 | * Authors: Alexander Graf <agraf@suse.de> | |
18 | */ | |
19 | ||
20 | #ifndef __ASM_KVM_BOOK3S_64_H__ | |
21 | #define __ASM_KVM_BOOK3S_64_H__ | |
22 | ||
de56a948 | 23 | #ifdef CONFIG_KVM_BOOK3S_PR |
468a12c2 | 24 | static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu) |
3ae07890 | 25 | { |
468a12c2 | 26 | preempt_disable(); |
3ae07890 AG |
27 | return &get_paca()->shadow_vcpu; |
28 | } | |
468a12c2 AG |
29 | |
30 | static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) | |
31 | { | |
32 | preempt_enable(); | |
33 | } | |
de56a948 | 34 | #endif |
3ae07890 | 35 | |
54738c09 DG |
36 | #define SPAPR_TCE_SHIFT 12 |
37 | ||
8936dda4 | 38 | #ifdef CONFIG_KVM_BOOK3S_64_HV |
32fad281 PM |
39 | #define KVM_DEFAULT_HPT_ORDER 24 /* 16MB HPT by default */ |
40 | extern int kvm_hpt_order; /* order of preallocated HPTs */ | |
8936dda4 PM |
41 | #endif |
42 | ||
697d3899 PM |
43 | #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ |
44 | ||
075295dd PM |
45 | /* |
46 | * We use a lock bit in HPTE dword 0 to synchronize updates and | |
47 | * accesses to each HPTE, and another bit to indicate non-present | |
48 | * HPTEs. | |
49 | */ | |
50 | #define HPTE_V_HVLOCK 0x40UL | |
697d3899 | 51 | #define HPTE_V_ABSENT 0x20UL |
075295dd PM |
52 | |
53 | static inline long try_lock_hpte(unsigned long *hpte, unsigned long bits) | |
54 | { | |
55 | unsigned long tmp, old; | |
56 | ||
57 | asm volatile(" ldarx %0,0,%2\n" | |
58 | " and. %1,%0,%3\n" | |
59 | " bne 2f\n" | |
60 | " ori %0,%0,%4\n" | |
61 | " stdcx. %0,0,%2\n" | |
62 | " beq+ 2f\n" | |
8b5869ad | 63 | " mr %1,%3\n" |
075295dd PM |
64 | "2: isync" |
65 | : "=&r" (tmp), "=&r" (old) | |
66 | : "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK) | |
67 | : "cc", "memory"); | |
68 | return old == 0; | |
69 | } | |
70 | ||
36cc66d6 AS |
71 | static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r, |
72 | unsigned long pte_index) | |
73 | { | |
74 | unsigned long rb, va_low; | |
75 | ||
76 | rb = (v & ~0x7fUL) << 16; /* AVA field */ | |
77 | va_low = pte_index >> 3; | |
78 | if (v & HPTE_V_SECONDARY) | |
79 | va_low = ~va_low; | |
80 | /* xor vsid from AVA */ | |
81 | if (!(v & HPTE_V_1TB_SEG)) | |
82 | va_low ^= v >> 12; | |
83 | else | |
84 | va_low ^= v >> 24; | |
85 | va_low &= 0x7ff; | |
86 | if (v & HPTE_V_LARGE) { | |
87 | rb |= 1; /* L field */ | |
88 | if (cpu_has_feature(CPU_FTR_ARCH_206) && | |
89 | (r & 0xff000)) { | |
90 | /* non-16MB large page, must be 64k */ | |
91 | /* (masks depend on page size) */ | |
92 | rb |= 0x1000; /* page encoding in LP field */ | |
93 | rb |= (va_low & 0x7f) << 16; /* 7b of VA in AVA/LP field */ | |
94 | rb |= (va_low & 0xfe); /* AVAL field (P7 doesn't seem to care) */ | |
95 | } | |
96 | } else { | |
97 | /* 4kB page */ | |
98 | rb |= (va_low & 0x7ff) << 12; /* remaining 11b of VA */ | |
99 | } | |
100 | rb |= (v >> 54) & 0x300; /* B field */ | |
101 | return rb; | |
102 | } | |
103 | ||
c77162de PM |
104 | static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) |
105 | { | |
106 | /* only handle 4k, 64k and 16M pages for now */ | |
107 | if (!(h & HPTE_V_LARGE)) | |
108 | return 1ul << 12; /* 4k page */ | |
109 | if ((l & 0xf000) == 0x1000 && cpu_has_feature(CPU_FTR_ARCH_206)) | |
110 | return 1ul << 16; /* 64k page */ | |
111 | if ((l & 0xff000) == 0) | |
112 | return 1ul << 24; /* 16M page */ | |
113 | return 0; /* error */ | |
114 | } | |
115 | ||
06ce2c63 PM |
116 | static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize) |
117 | { | |
118 | return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT; | |
119 | } | |
120 | ||
4cf302bc PM |
121 | static inline int hpte_is_writable(unsigned long ptel) |
122 | { | |
123 | unsigned long pp = ptel & (HPTE_R_PP0 | HPTE_R_PP); | |
124 | ||
125 | return pp != PP_RXRX && pp != PP_RXXX; | |
126 | } | |
127 | ||
128 | static inline unsigned long hpte_make_readonly(unsigned long ptel) | |
129 | { | |
130 | if ((ptel & HPTE_R_PP0) || (ptel & HPTE_R_PP) == PP_RWXX) | |
131 | ptel = (ptel & ~HPTE_R_PP) | PP_RXXX; | |
132 | else | |
133 | ptel |= PP_RXRX; | |
134 | return ptel; | |
135 | } | |
136 | ||
9d0ef5ea PM |
137 | static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) |
138 | { | |
139 | unsigned int wimg = ptel & HPTE_R_WIMG; | |
140 | ||
141 | /* Handle SAO */ | |
142 | if (wimg == (HPTE_R_W | HPTE_R_I | HPTE_R_M) && | |
143 | cpu_has_feature(CPU_FTR_ARCH_206)) | |
144 | wimg = HPTE_R_M; | |
145 | ||
146 | if (!io_type) | |
147 | return wimg == HPTE_R_M; | |
148 | ||
149 | return (wimg & (HPTE_R_W | HPTE_R_I)) == io_type; | |
150 | } | |
151 | ||
342d3db7 PM |
152 | /* |
153 | * Lock and read a linux PTE. If it's present and writable, atomically | |
154 | * set dirty and referenced bits and return the PTE, otherwise return 0. | |
155 | */ | |
4cf302bc | 156 | static inline pte_t kvmppc_read_update_linux_pte(pte_t *p, int writing) |
342d3db7 PM |
157 | { |
158 | pte_t pte, tmp; | |
159 | ||
160 | /* wait until _PAGE_BUSY is clear then set it atomically */ | |
161 | __asm__ __volatile__ ( | |
162 | "1: ldarx %0,0,%3\n" | |
163 | " andi. %1,%0,%4\n" | |
164 | " bne- 1b\n" | |
165 | " ori %1,%0,%4\n" | |
166 | " stdcx. %1,0,%3\n" | |
167 | " bne- 1b" | |
168 | : "=&r" (pte), "=&r" (tmp), "=m" (*p) | |
169 | : "r" (p), "i" (_PAGE_BUSY) | |
170 | : "cc"); | |
171 | ||
172 | if (pte_present(pte)) { | |
173 | pte = pte_mkyoung(pte); | |
4cf302bc | 174 | if (writing && pte_write(pte)) |
342d3db7 PM |
175 | pte = pte_mkdirty(pte); |
176 | } | |
177 | ||
178 | *p = pte; /* clears _PAGE_BUSY */ | |
179 | ||
180 | return pte; | |
181 | } | |
182 | ||
9d0ef5ea PM |
183 | /* Return HPTE cache control bits corresponding to Linux pte bits */ |
184 | static inline unsigned long hpte_cache_bits(unsigned long pte_val) | |
185 | { | |
186 | #if _PAGE_NO_CACHE == HPTE_R_I && _PAGE_WRITETHRU == HPTE_R_W | |
187 | return pte_val & (HPTE_R_W | HPTE_R_I); | |
188 | #else | |
189 | return ((pte_val & _PAGE_NO_CACHE) ? HPTE_R_I : 0) + | |
190 | ((pte_val & _PAGE_WRITETHRU) ? HPTE_R_W : 0); | |
191 | #endif | |
192 | } | |
193 | ||
697d3899 PM |
194 | static inline bool hpte_read_permission(unsigned long pp, unsigned long key) |
195 | { | |
196 | if (key) | |
197 | return PP_RWRX <= pp && pp <= PP_RXRX; | |
198 | return 1; | |
199 | } | |
200 | ||
201 | static inline bool hpte_write_permission(unsigned long pp, unsigned long key) | |
202 | { | |
203 | if (key) | |
204 | return pp == PP_RWRW; | |
205 | return pp <= PP_RWRW; | |
206 | } | |
207 | ||
208 | static inline int hpte_get_skey_perm(unsigned long hpte_r, unsigned long amr) | |
209 | { | |
210 | unsigned long skey; | |
211 | ||
212 | skey = ((hpte_r & HPTE_R_KEY_HI) >> 57) | | |
213 | ((hpte_r & HPTE_R_KEY_LO) >> 9); | |
214 | return (amr >> (62 - 2 * skey)) & 3; | |
215 | } | |
216 | ||
06ce2c63 PM |
217 | static inline void lock_rmap(unsigned long *rmap) |
218 | { | |
219 | do { | |
220 | while (test_bit(KVMPPC_RMAP_LOCK_BIT, rmap)) | |
221 | cpu_relax(); | |
222 | } while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmap)); | |
223 | } | |
224 | ||
225 | static inline void unlock_rmap(unsigned long *rmap) | |
226 | { | |
227 | __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmap); | |
228 | } | |
229 | ||
da9d1d7f PM |
230 | static inline bool slot_is_aligned(struct kvm_memory_slot *memslot, |
231 | unsigned long pagesize) | |
232 | { | |
233 | unsigned long mask = (pagesize >> PAGE_SHIFT) - 1; | |
234 | ||
235 | if (pagesize <= PAGE_SIZE) | |
236 | return 1; | |
237 | return !(memslot->base_gfn & mask) && !(memslot->npages & mask); | |
238 | } | |
239 | ||
3ae07890 | 240 | #endif /* __ASM_KVM_BOOK3S_64_H__ */ |