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1965aae3 PA |
1 | #ifndef _ASM_X86_TLBFLUSH_H |
2 | #define _ASM_X86_TLBFLUSH_H | |
d291cf83 TG |
3 | |
4 | #include <linux/mm.h> | |
5 | #include <linux/sched.h> | |
6 | ||
7 | #include <asm/processor.h> | |
cd4d09ec | 8 | #include <asm/cpufeature.h> |
f05e798a | 9 | #include <asm/special_insns.h> |
ce4a4e56 | 10 | #include <asm/smp.h> |
d291cf83 | 11 | |
060a402a AL |
12 | static inline void __invpcid(unsigned long pcid, unsigned long addr, |
13 | unsigned long type) | |
14 | { | |
e2c7698c | 15 | struct { u64 d[2]; } desc = { { pcid, addr } }; |
060a402a AL |
16 | |
17 | /* | |
18 | * The memory clobber is because the whole point is to invalidate | |
19 | * stale TLB entries and, especially if we're flushing global | |
20 | * mappings, we don't want the compiler to reorder any subsequent | |
21 | * memory accesses before the TLB flush. | |
22 | * | |
23 | * The hex opcode is invpcid (%ecx), %eax in 32-bit mode and | |
24 | * invpcid (%rcx), %rax in long mode. | |
25 | */ | |
26 | asm volatile (".byte 0x66, 0x0f, 0x38, 0x82, 0x01" | |
e2c7698c | 27 | : : "m" (desc), "a" (type), "c" (&desc) : "memory"); |
060a402a AL |
28 | } |
29 | ||
30 | #define INVPCID_TYPE_INDIV_ADDR 0 | |
31 | #define INVPCID_TYPE_SINGLE_CTXT 1 | |
32 | #define INVPCID_TYPE_ALL_INCL_GLOBAL 2 | |
33 | #define INVPCID_TYPE_ALL_NON_GLOBAL 3 | |
34 | ||
35 | /* Flush all mappings for a given pcid and addr, not including globals. */ | |
36 | static inline void invpcid_flush_one(unsigned long pcid, | |
37 | unsigned long addr) | |
38 | { | |
39 | __invpcid(pcid, addr, INVPCID_TYPE_INDIV_ADDR); | |
40 | } | |
41 | ||
42 | /* Flush all mappings for a given PCID, not including globals. */ | |
43 | static inline void invpcid_flush_single_context(unsigned long pcid) | |
44 | { | |
45 | __invpcid(pcid, 0, INVPCID_TYPE_SINGLE_CTXT); | |
46 | } | |
47 | ||
48 | /* Flush all mappings, including globals, for all PCIDs. */ | |
49 | static inline void invpcid_flush_all(void) | |
50 | { | |
51 | __invpcid(0, 0, INVPCID_TYPE_ALL_INCL_GLOBAL); | |
52 | } | |
53 | ||
54 | /* Flush all mappings for all PCIDs except globals. */ | |
55 | static inline void invpcid_flush_all_nonglobals(void) | |
56 | { | |
57 | __invpcid(0, 0, INVPCID_TYPE_ALL_NON_GLOBAL); | |
58 | } | |
59 | ||
d291cf83 TG |
60 | #ifdef CONFIG_PARAVIRT |
61 | #include <asm/paravirt.h> | |
62 | #else | |
63 | #define __flush_tlb() __native_flush_tlb() | |
64 | #define __flush_tlb_global() __native_flush_tlb_global() | |
65 | #define __flush_tlb_single(addr) __native_flush_tlb_single(addr) | |
66 | #endif | |
67 | ||
1e02ce4c | 68 | struct tlb_state { |
3d28ebce AL |
69 | /* |
70 | * cpu_tlbstate.loaded_mm should match CR3 whenever interrupts | |
71 | * are on. This means that it may not match current->active_mm, | |
72 | * which will contain the previous user mm when we're in lazy TLB | |
73 | * mode even if we've already switched back to swapper_pg_dir. | |
74 | */ | |
75 | struct mm_struct *loaded_mm; | |
1e02ce4c | 76 | int state; |
1e02ce4c AL |
77 | |
78 | /* | |
79 | * Access to this CR4 shadow and to H/W CR4 is protected by | |
80 | * disabling interrupts when modifying either one. | |
81 | */ | |
82 | unsigned long cr4; | |
83 | }; | |
84 | DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate); | |
85 | ||
86 | /* Initialize cr4 shadow for this CPU. */ | |
87 | static inline void cr4_init_shadow(void) | |
88 | { | |
1ef55be1 | 89 | this_cpu_write(cpu_tlbstate.cr4, __read_cr4()); |
1e02ce4c AL |
90 | } |
91 | ||
375074cc AL |
92 | /* Set in this cpu's CR4. */ |
93 | static inline void cr4_set_bits(unsigned long mask) | |
94 | { | |
95 | unsigned long cr4; | |
96 | ||
1e02ce4c AL |
97 | cr4 = this_cpu_read(cpu_tlbstate.cr4); |
98 | if ((cr4 | mask) != cr4) { | |
99 | cr4 |= mask; | |
100 | this_cpu_write(cpu_tlbstate.cr4, cr4); | |
101 | __write_cr4(cr4); | |
102 | } | |
375074cc AL |
103 | } |
104 | ||
105 | /* Clear in this cpu's CR4. */ | |
106 | static inline void cr4_clear_bits(unsigned long mask) | |
107 | { | |
108 | unsigned long cr4; | |
109 | ||
1e02ce4c AL |
110 | cr4 = this_cpu_read(cpu_tlbstate.cr4); |
111 | if ((cr4 & ~mask) != cr4) { | |
112 | cr4 &= ~mask; | |
113 | this_cpu_write(cpu_tlbstate.cr4, cr4); | |
114 | __write_cr4(cr4); | |
115 | } | |
116 | } | |
117 | ||
5a920155 TG |
118 | static inline void cr4_toggle_bits(unsigned long mask) |
119 | { | |
120 | unsigned long cr4; | |
121 | ||
122 | cr4 = this_cpu_read(cpu_tlbstate.cr4); | |
123 | cr4 ^= mask; | |
124 | this_cpu_write(cpu_tlbstate.cr4, cr4); | |
125 | __write_cr4(cr4); | |
126 | } | |
127 | ||
1e02ce4c AL |
128 | /* Read the CR4 shadow. */ |
129 | static inline unsigned long cr4_read_shadow(void) | |
130 | { | |
131 | return this_cpu_read(cpu_tlbstate.cr4); | |
375074cc AL |
132 | } |
133 | ||
134 | /* | |
135 | * Save some of cr4 feature set we're using (e.g. Pentium 4MB | |
136 | * enable and PPro Global page enable), so that any CPU's that boot | |
137 | * up after us can get the correct flags. This should only be used | |
138 | * during boot on the boot cpu. | |
139 | */ | |
140 | extern unsigned long mmu_cr4_features; | |
141 | extern u32 *trampoline_cr4_features; | |
142 | ||
143 | static inline void cr4_set_bits_and_update_boot(unsigned long mask) | |
144 | { | |
145 | mmu_cr4_features |= mask; | |
146 | if (trampoline_cr4_features) | |
147 | *trampoline_cr4_features = mmu_cr4_features; | |
148 | cr4_set_bits(mask); | |
149 | } | |
150 | ||
d291cf83 TG |
151 | static inline void __native_flush_tlb(void) |
152 | { | |
5cf0791d SAS |
153 | /* |
154 | * If current->mm == NULL then we borrow a mm which may change during a | |
155 | * task switch and therefore we must not be preempted while we write CR3 | |
156 | * back: | |
157 | */ | |
158 | preempt_disable(); | |
d7285c6b | 159 | native_write_cr3(native_read_cr3()); |
5cf0791d | 160 | preempt_enable(); |
d291cf83 TG |
161 | } |
162 | ||
086fc8f8 FY |
163 | static inline void __native_flush_tlb_global_irq_disabled(void) |
164 | { | |
165 | unsigned long cr4; | |
166 | ||
1e02ce4c | 167 | cr4 = this_cpu_read(cpu_tlbstate.cr4); |
086fc8f8 FY |
168 | /* clear PGE */ |
169 | native_write_cr4(cr4 & ~X86_CR4_PGE); | |
170 | /* write old PGE again and flush TLBs */ | |
171 | native_write_cr4(cr4); | |
172 | } | |
173 | ||
d291cf83 TG |
174 | static inline void __native_flush_tlb_global(void) |
175 | { | |
b1979a5f | 176 | unsigned long flags; |
d291cf83 | 177 | |
d8bced79 AL |
178 | if (static_cpu_has(X86_FEATURE_INVPCID)) { |
179 | /* | |
180 | * Using INVPCID is considerably faster than a pair of writes | |
181 | * to CR4 sandwiched inside an IRQ flag save/restore. | |
182 | */ | |
183 | invpcid_flush_all(); | |
184 | return; | |
185 | } | |
186 | ||
b1979a5f IM |
187 | /* |
188 | * Read-modify-write to CR4 - protect it from preemption and | |
189 | * from interrupts. (Use the raw variant because this code can | |
190 | * be called from deep inside debugging code.) | |
191 | */ | |
192 | raw_local_irq_save(flags); | |
193 | ||
086fc8f8 | 194 | __native_flush_tlb_global_irq_disabled(); |
b1979a5f IM |
195 | |
196 | raw_local_irq_restore(flags); | |
d291cf83 TG |
197 | } |
198 | ||
199 | static inline void __native_flush_tlb_single(unsigned long addr) | |
200 | { | |
94cf8de0 | 201 | asm volatile("invlpg (%0)" ::"r" (addr) : "memory"); |
d291cf83 TG |
202 | } |
203 | ||
204 | static inline void __flush_tlb_all(void) | |
205 | { | |
2c4ea6e2 | 206 | if (boot_cpu_has(X86_FEATURE_PGE)) |
d291cf83 TG |
207 | __flush_tlb_global(); |
208 | else | |
209 | __flush_tlb(); | |
210 | } | |
211 | ||
212 | static inline void __flush_tlb_one(unsigned long addr) | |
213 | { | |
ec659934 | 214 | count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE); |
e8747f10 | 215 | __flush_tlb_single(addr); |
d291cf83 TG |
216 | } |
217 | ||
3e7f3db0 | 218 | #define TLB_FLUSH_ALL -1UL |
d291cf83 TG |
219 | |
220 | /* | |
221 | * TLB flushing: | |
222 | * | |
d291cf83 TG |
223 | * - flush_tlb_all() flushes all processes TLBs |
224 | * - flush_tlb_mm(mm) flushes the specified mm context TLB's | |
225 | * - flush_tlb_page(vma, vmaddr) flushes one page | |
226 | * - flush_tlb_range(vma, start, end) flushes a range of pages | |
227 | * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages | |
a2055abe | 228 | * - flush_tlb_others(cpumask, info) flushes TLBs on other cpus |
d291cf83 TG |
229 | * |
230 | * ..but the i386 has somewhat limited tlb flushing capabilities, | |
231 | * and page-granular flushes are available only on i486 and up. | |
d291cf83 | 232 | */ |
a2055abe AL |
233 | struct flush_tlb_info { |
234 | struct mm_struct *mm; | |
235 | unsigned long start; | |
236 | unsigned long end; | |
237 | }; | |
238 | ||
d291cf83 TG |
239 | #define local_flush_tlb() __flush_tlb() |
240 | ||
611ae8e3 AS |
241 | #define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL) |
242 | ||
243 | #define flush_tlb_range(vma, start, end) \ | |
244 | flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags) | |
245 | ||
d291cf83 | 246 | extern void flush_tlb_all(void); |
611ae8e3 AS |
247 | extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, |
248 | unsigned long end, unsigned long vmflag); | |
effee4b9 | 249 | extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); |
d291cf83 | 250 | |
ca6c99c0 AL |
251 | static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long a) |
252 | { | |
253 | flush_tlb_mm_range(vma->vm_mm, a, a + PAGE_SIZE, VM_NONE); | |
254 | } | |
255 | ||
4595f962 | 256 | void native_flush_tlb_others(const struct cpumask *cpumask, |
a2055abe | 257 | const struct flush_tlb_info *info); |
d291cf83 TG |
258 | |
259 | #define TLBSTATE_OK 1 | |
260 | #define TLBSTATE_LAZY 2 | |
261 | ||
913da64b AN |
262 | static inline void reset_lazy_tlbstate(void) |
263 | { | |
c6ae41e7 | 264 | this_cpu_write(cpu_tlbstate.state, 0); |
3d28ebce AL |
265 | this_cpu_write(cpu_tlbstate.loaded_mm, &init_mm); |
266 | ||
267 | WARN_ON(read_cr3() != __pa_symbol(swapper_pg_dir)); | |
913da64b | 268 | } |
d291cf83 | 269 | |
e73ad5ff AL |
270 | static inline void arch_tlbbatch_add_mm(struct arch_tlbflush_unmap_batch *batch, |
271 | struct mm_struct *mm) | |
272 | { | |
273 | cpumask_or(&batch->cpumask, &batch->cpumask, mm_cpumask(mm)); | |
274 | } | |
275 | ||
276 | extern void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch); | |
277 | ||
d291cf83 | 278 | #ifndef CONFIG_PARAVIRT |
a2055abe AL |
279 | #define flush_tlb_others(mask, info) \ |
280 | native_flush_tlb_others(mask, info) | |
96a388de | 281 | #endif |
d291cf83 | 282 | |
1965aae3 | 283 | #endif /* _ASM_X86_TLBFLUSH_H */ |