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24#include <linux/kernel.h>
25#include <linux/mm.h>
26#include <linux/percpu.h>
27#include <linux/hardirq.h>
28#include <asm/pgalloc.h>
29#include <asm/tlbflush.h>
30#include <asm/tlb.h>
31#include <asm/bug.h>
32
33#include <trace/events/thp.h>
34
35DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
36
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41
42
43void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
44 pte_t *ptep, unsigned long pte, int huge)
45{
46 unsigned long vpn;
47 struct ppc64_tlb_batch *batch = &get_cpu_var(ppc64_tlb_batch);
48 unsigned long vsid;
49 unsigned int psize;
50 int ssize;
51 real_pte_t rpte;
52 int i;
53
54 i = batch->index;
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56
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60
61
62
63 if (huge) {
64#ifdef CONFIG_HUGETLB_PAGE
65 psize = get_slice_psize(mm, addr);
66
67 addr &= ~((1UL << mmu_psize_defs[psize].shift) - 1);
68#else
69 BUG();
70 psize = pte_pagesize_index(mm, addr, pte);
71#endif
72 } else {
73 psize = pte_pagesize_index(mm, addr, pte);
74
75
76
77
78 addr &= PAGE_MASK;
79 }
80
81
82
83 if (!is_kernel_addr(addr)) {
84 ssize = user_segment_size(addr);
85 vsid = get_vsid(mm->context.id, addr, ssize);
86 } else {
87 vsid = get_kernel_vsid(addr, mmu_kernel_ssize);
88 ssize = mmu_kernel_ssize;
89 }
90 WARN_ON(vsid == 0);
91 vpn = hpt_vpn(addr, vsid, ssize);
92 rpte = __real_pte(__pte(pte), ptep);
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97
98
99
100 if (!batch->active) {
101 flush_hash_page(vpn, rpte, psize, ssize, 0);
102 put_cpu_var(ppc64_tlb_batch);
103 return;
104 }
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115
116 if (i != 0 && (mm != batch->mm || batch->psize != psize ||
117 batch->ssize != ssize)) {
118 __flush_tlb_pending(batch);
119 i = 0;
120 }
121 if (i == 0) {
122 batch->mm = mm;
123 batch->psize = psize;
124 batch->ssize = ssize;
125 }
126 batch->pte[i] = rpte;
127 batch->vpn[i] = vpn;
128 batch->index = ++i;
129 if (i >= PPC64_TLB_BATCH_NR)
130 __flush_tlb_pending(batch);
131 put_cpu_var(ppc64_tlb_batch);
132}
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139
140
141void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
142{
143 const struct cpumask *tmp;
144 int i, local = 0;
145
146 i = batch->index;
147 tmp = cpumask_of(smp_processor_id());
148 if (cpumask_equal(mm_cpumask(batch->mm), tmp))
149 local = 1;
150 if (i == 1)
151 flush_hash_page(batch->vpn[0], batch->pte[0],
152 batch->psize, batch->ssize, local);
153 else
154 flush_hash_range(i, local);
155 batch->index = 0;
156}
157
158void tlb_flush(struct mmu_gather *tlb)
159{
160 struct ppc64_tlb_batch *tlbbatch = &get_cpu_var(ppc64_tlb_batch);
161
162
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164
165
166 if (tlbbatch->index)
167 __flush_tlb_pending(tlbbatch);
168
169 put_cpu_var(ppc64_tlb_batch);
170}
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189
190void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
191 unsigned long end)
192{
193 bool is_thp;
194 int hugepage_shift;
195 unsigned long flags;
196
197 start = _ALIGN_DOWN(start, PAGE_SIZE);
198 end = _ALIGN_UP(end, PAGE_SIZE);
199
200 BUG_ON(!mm->pgd);
201
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208
209 local_irq_save(flags);
210 arch_enter_lazy_mmu_mode();
211 for (; start < end; start += PAGE_SIZE) {
212 pte_t *ptep = find_linux_pte_or_hugepte(mm->pgd, start, &is_thp,
213 &hugepage_shift);
214 unsigned long pte;
215
216 if (ptep == NULL)
217 continue;
218 pte = pte_val(*ptep);
219 if (is_thp)
220 trace_hugepage_invalidate(start, pte);
221 if (!(pte & _PAGE_HASHPTE))
222 continue;
223 if (unlikely(is_thp))
224 hpte_do_hugepage_flush(mm, start, (pmd_t *)ptep, pte);
225 else
226 hpte_need_flush(mm, start, ptep, pte, hugepage_shift);
227 }
228 arch_leave_lazy_mmu_mode();
229 local_irq_restore(flags);
230}
231
232void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd, unsigned long addr)
233{
234 pte_t *pte;
235 pte_t *start_pte;
236 unsigned long flags;
237
238 addr = _ALIGN_DOWN(addr, PMD_SIZE);
239
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244
245
246 local_irq_save(flags);
247 arch_enter_lazy_mmu_mode();
248 start_pte = pte_offset_map(pmd, addr);
249 for (pte = start_pte; pte < start_pte + PTRS_PER_PTE; pte++) {
250 unsigned long pteval = pte_val(*pte);
251 if (pteval & _PAGE_HASHPTE)
252 hpte_need_flush(mm, addr, pte, pteval, 0);
253 addr += PAGE_SIZE;
254 }
255 arch_leave_lazy_mmu_mode();
256 local_irq_restore(flags);
257}
258