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1 | /* |
2 | * TLB flush routines for radix kernels. | |
3 | * | |
4 | * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/mm.h> | |
13 | #include <linux/hugetlb.h> | |
14 | #include <linux/memblock.h> | |
15 | ||
16 | #include <asm/tlb.h> | |
17 | #include <asm/tlbflush.h> | |
18 | ||
19 | static DEFINE_RAW_SPINLOCK(native_tlbie_lock); | |
20 | ||
21 | static inline void __tlbiel_pid(unsigned long pid, int set) | |
22 | { | |
23 | unsigned long rb,rs,ric,prs,r; | |
24 | ||
25 | rb = PPC_BIT(53); /* IS = 1 */ | |
26 | rb |= set << PPC_BITLSHIFT(51); | |
27 | rs = ((unsigned long)pid) << PPC_BITLSHIFT(31); | |
28 | prs = 1; /* process scoped */ | |
29 | r = 1; /* raidx format */ | |
30 | ric = 2; /* invalidate all the caches */ | |
31 | ||
32 | asm volatile("ptesync": : :"memory"); | |
33 | asm volatile(".long 0x7c000224 | (%0 << 11) | (%1 << 16) |" | |
34 | "(%2 << 17) | (%3 << 18) | (%4 << 21)" | |
35 | : : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory"); | |
36 | asm volatile("ptesync": : :"memory"); | |
37 | } | |
38 | ||
39 | /* | |
40 | * We use 128 set in radix mode and 256 set in hpt mode. | |
41 | */ | |
42 | static inline void _tlbiel_pid(unsigned long pid) | |
43 | { | |
44 | int set; | |
45 | ||
46 | for (set = 0; set < POWER9_TLB_SETS_RADIX ; set++) { | |
47 | __tlbiel_pid(pid, set); | |
48 | } | |
49 | return; | |
50 | } | |
51 | ||
52 | static inline void _tlbie_pid(unsigned long pid) | |
53 | { | |
54 | unsigned long rb,rs,ric,prs,r; | |
55 | ||
56 | rb = PPC_BIT(53); /* IS = 1 */ | |
57 | rs = pid << PPC_BITLSHIFT(31); | |
58 | prs = 1; /* process scoped */ | |
59 | r = 1; /* raidx format */ | |
60 | ric = 2; /* invalidate all the caches */ | |
61 | ||
62 | asm volatile("ptesync": : :"memory"); | |
63 | asm volatile(".long 0x7c000264 | (%0 << 11) | (%1 << 16) |" | |
64 | "(%2 << 17) | (%3 << 18) | (%4 << 21)" | |
65 | : : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory"); | |
66 | asm volatile("eieio; tlbsync; ptesync": : :"memory"); | |
67 | } | |
68 | ||
69 | static inline void _tlbiel_va(unsigned long va, unsigned long pid, | |
70 | unsigned long ap) | |
71 | { | |
72 | unsigned long rb,rs,ric,prs,r; | |
73 | ||
74 | rb = va & ~(PPC_BITMASK(52, 63)); | |
75 | rb |= ap << PPC_BITLSHIFT(58); | |
76 | rs = pid << PPC_BITLSHIFT(31); | |
77 | prs = 1; /* process scoped */ | |
78 | r = 1; /* raidx format */ | |
79 | ric = 0; /* no cluster flush yet */ | |
80 | ||
81 | asm volatile("ptesync": : :"memory"); | |
82 | asm volatile(".long 0x7c000224 | (%0 << 11) | (%1 << 16) |" | |
83 | "(%2 << 17) | (%3 << 18) | (%4 << 21)" | |
84 | : : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory"); | |
85 | asm volatile("ptesync": : :"memory"); | |
86 | } | |
87 | ||
88 | static inline void _tlbie_va(unsigned long va, unsigned long pid, | |
89 | unsigned long ap) | |
90 | { | |
91 | unsigned long rb,rs,ric,prs,r; | |
92 | ||
93 | rb = va & ~(PPC_BITMASK(52, 63)); | |
94 | rb |= ap << PPC_BITLSHIFT(58); | |
95 | rs = pid << PPC_BITLSHIFT(31); | |
96 | prs = 1; /* process scoped */ | |
97 | r = 1; /* raidx format */ | |
98 | ric = 0; /* no cluster flush yet */ | |
99 | ||
100 | asm volatile("ptesync": : :"memory"); | |
101 | asm volatile(".long 0x7c000264 | (%0 << 11) | (%1 << 16) |" | |
102 | "(%2 << 17) | (%3 << 18) | (%4 << 21)" | |
103 | : : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory"); | |
104 | asm volatile("eieio; tlbsync; ptesync": : :"memory"); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Base TLB flushing operations: | |
109 | * | |
110 | * - flush_tlb_mm(mm) flushes the specified mm context TLB's | |
111 | * - flush_tlb_page(vma, vmaddr) flushes one page | |
112 | * - flush_tlb_range(vma, start, end) flushes a range of pages | |
113 | * - flush_tlb_kernel_range(start, end) flushes kernel pages | |
114 | * | |
115 | * - local_* variants of page and mm only apply to the current | |
116 | * processor | |
117 | */ | |
118 | void radix__local_flush_tlb_mm(struct mm_struct *mm) | |
119 | { | |
120 | unsigned int pid; | |
121 | ||
122 | preempt_disable(); | |
123 | pid = mm->context.id; | |
124 | if (pid != MMU_NO_CONTEXT) | |
125 | _tlbiel_pid(pid); | |
126 | preempt_enable(); | |
127 | } | |
128 | EXPORT_SYMBOL(radix__local_flush_tlb_mm); | |
129 | ||
130 | void radix___local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr, | |
131 | unsigned long ap, int nid) | |
132 | { | |
133 | unsigned int pid; | |
134 | ||
135 | preempt_disable(); | |
136 | pid = mm ? mm->context.id : 0; | |
137 | if (pid != MMU_NO_CONTEXT) | |
138 | _tlbiel_va(vmaddr, pid, ap); | |
139 | preempt_enable(); | |
140 | } | |
141 | ||
142 | void radix__local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) | |
143 | { | |
144 | radix___local_flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, | |
145 | mmu_get_ap(mmu_virtual_psize), 0); | |
146 | } | |
147 | EXPORT_SYMBOL(radix__local_flush_tlb_page); | |
148 | ||
149 | #ifdef CONFIG_SMP | |
150 | static int mm_is_core_local(struct mm_struct *mm) | |
151 | { | |
152 | return cpumask_subset(mm_cpumask(mm), | |
153 | topology_sibling_cpumask(smp_processor_id())); | |
154 | } | |
155 | ||
156 | void radix__flush_tlb_mm(struct mm_struct *mm) | |
157 | { | |
158 | unsigned int pid; | |
159 | ||
160 | preempt_disable(); | |
161 | pid = mm->context.id; | |
162 | if (unlikely(pid == MMU_NO_CONTEXT)) | |
163 | goto no_context; | |
164 | ||
165 | if (!mm_is_core_local(mm)) { | |
166 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); | |
167 | ||
168 | if (lock_tlbie) | |
169 | raw_spin_lock(&native_tlbie_lock); | |
170 | _tlbie_pid(pid); | |
171 | if (lock_tlbie) | |
172 | raw_spin_unlock(&native_tlbie_lock); | |
173 | } else | |
174 | _tlbiel_pid(pid); | |
175 | no_context: | |
176 | preempt_enable(); | |
177 | } | |
178 | EXPORT_SYMBOL(radix__flush_tlb_mm); | |
179 | ||
180 | void radix___flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr, | |
181 | unsigned long ap, int nid) | |
182 | { | |
183 | unsigned int pid; | |
184 | ||
185 | preempt_disable(); | |
186 | pid = mm ? mm->context.id : 0; | |
187 | if (unlikely(pid == MMU_NO_CONTEXT)) | |
188 | goto bail; | |
189 | if (!mm_is_core_local(mm)) { | |
190 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); | |
191 | ||
192 | if (lock_tlbie) | |
193 | raw_spin_lock(&native_tlbie_lock); | |
194 | _tlbie_va(vmaddr, pid, ap); | |
195 | if (lock_tlbie) | |
196 | raw_spin_unlock(&native_tlbie_lock); | |
197 | } else | |
198 | _tlbiel_va(vmaddr, pid, ap); | |
199 | bail: | |
200 | preempt_enable(); | |
201 | } | |
202 | ||
203 | void radix__flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) | |
204 | { | |
205 | radix___flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, | |
206 | mmu_get_ap(mmu_virtual_psize), 0); | |
207 | } | |
208 | EXPORT_SYMBOL(radix__flush_tlb_page); | |
209 | ||
210 | #endif /* CONFIG_SMP */ | |
211 | ||
212 | void radix__flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
213 | { | |
214 | int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); | |
215 | ||
216 | if (lock_tlbie) | |
217 | raw_spin_lock(&native_tlbie_lock); | |
218 | _tlbie_pid(0); | |
219 | if (lock_tlbie) | |
220 | raw_spin_unlock(&native_tlbie_lock); | |
221 | } | |
222 | EXPORT_SYMBOL(radix__flush_tlb_kernel_range); | |
223 | ||
224 | /* | |
225 | * Currently, for range flushing, we just do a full mm flush. Because | |
226 | * we use this in code path where we don' track the page size. | |
227 | */ | |
228 | void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
229 | unsigned long end) | |
230 | ||
231 | { | |
232 | struct mm_struct *mm = vma->vm_mm; | |
233 | radix__flush_tlb_mm(mm); | |
234 | } | |
235 | EXPORT_SYMBOL(radix__flush_tlb_range); | |
236 | ||
237 | ||
238 | void radix__tlb_flush(struct mmu_gather *tlb) | |
239 | { | |
240 | struct mm_struct *mm = tlb->mm; | |
241 | radix__flush_tlb_mm(mm); | |
242 | } |