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1da177e4 LT |
1 | #ifndef _ASM_IA64_TLB_H |
2 | #define _ASM_IA64_TLB_H | |
3 | /* | |
4 | * Based on <asm-generic/tlb.h>. | |
5 | * | |
6 | * Copyright (C) 2002-2003 Hewlett-Packard Co | |
7 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
8 | */ | |
9 | /* | |
10 | * Removing a translation from a page table (including TLB-shootdown) is a four-step | |
11 | * procedure: | |
12 | * | |
13 | * (1) Flush (virtual) caches --- ensures virtual memory is coherent with kernel memory | |
14 | * (this is a no-op on ia64). | |
15 | * (2) Clear the relevant portions of the page-table | |
16 | * (3) Flush the TLBs --- ensures that stale content is gone from CPU TLBs | |
17 | * (4) Release the pages that were freed up in step (2). | |
18 | * | |
19 | * Note that the ordering of these steps is crucial to avoid races on MP machines. | |
20 | * | |
21 | * The Linux kernel defines several platform-specific hooks for TLB-shootdown. When | |
22 | * unmapping a portion of the virtual address space, these hooks are called according to | |
23 | * the following template: | |
24 | * | |
2b047252 | 25 | * tlb <- tlb_gather_mmu(mm, start, end); // start unmap for address space MM |
1da177e4 LT |
26 | * { |
27 | * for each vma that needs a shootdown do { | |
28 | * tlb_start_vma(tlb, vma); | |
29 | * for each page-table-entry PTE that needs to be removed do { | |
30 | * tlb_remove_tlb_entry(tlb, pte, address); | |
31 | * if (pte refers to a normal page) { | |
32 | * tlb_remove_page(tlb, page); | |
33 | * } | |
34 | * } | |
35 | * tlb_end_vma(tlb, vma); | |
36 | * } | |
37 | * } | |
38 | * tlb_finish_mmu(tlb, start, end); // finish unmap for address space MM | |
39 | */ | |
1da177e4 LT |
40 | #include <linux/mm.h> |
41 | #include <linux/pagemap.h> | |
42 | #include <linux/swap.h> | |
43 | ||
44 | #include <asm/pgalloc.h> | |
45 | #include <asm/processor.h> | |
46 | #include <asm/tlbflush.h> | |
47 | #include <asm/machvec.h> | |
48 | ||
7a95a2c8 PZ |
49 | /* |
50 | * If we can't allocate a page to make a big batch of page pointers | |
51 | * to work on, then just handle a few from the on-stack structure. | |
52 | */ | |
53 | #define IA64_GATHER_BUNDLE 8 | |
54 | ||
1da177e4 LT |
55 | struct mmu_gather { |
56 | struct mm_struct *mm; | |
29eb7782 | 57 | unsigned int nr; |
7a95a2c8 | 58 | unsigned int max; |
1da177e4 LT |
59 | unsigned char fullmm; /* non-zero means full mm flush */ |
60 | unsigned char need_flush; /* really unmapped some PTEs? */ | |
2b047252 | 61 | unsigned long start, end; |
1da177e4 LT |
62 | unsigned long start_addr; |
63 | unsigned long end_addr; | |
7a95a2c8 PZ |
64 | struct page **pages; |
65 | struct page *local[IA64_GATHER_BUNDLE]; | |
1da177e4 LT |
66 | }; |
67 | ||
96651896 XZ |
68 | struct ia64_tr_entry { |
69 | u64 ifa; | |
70 | u64 itir; | |
71 | u64 pte; | |
72 | u64 rr; | |
73 | }; /*Record for tr entry!*/ | |
74 | ||
75 | extern int ia64_itr_entry(u64 target_mask, u64 va, u64 pte, u64 log_size); | |
76 | extern void ia64_ptr_entry(u64 target_mask, int slot); | |
77 | ||
6c57a332 | 78 | extern struct ia64_tr_entry *ia64_idtrs[NR_CPUS]; |
96651896 XZ |
79 | |
80 | /* | |
81 | region register macros | |
82 | */ | |
83 | #define RR_TO_VE(val) (((val) >> 0) & 0x0000000000000001) | |
84 | #define RR_VE(val) (((val) & 0x0000000000000001) << 0) | |
85 | #define RR_VE_MASK 0x0000000000000001L | |
86 | #define RR_VE_SHIFT 0 | |
87 | #define RR_TO_PS(val) (((val) >> 2) & 0x000000000000003f) | |
88 | #define RR_PS(val) (((val) & 0x000000000000003f) << 2) | |
89 | #define RR_PS_MASK 0x00000000000000fcL | |
90 | #define RR_PS_SHIFT 2 | |
91 | #define RR_RID_MASK 0x00000000ffffff00L | |
92 | #define RR_TO_RID(val) ((val >> 8) & 0xffffff) | |
93 | ||
1da177e4 LT |
94 | /* |
95 | * Flush the TLB for address range START to END and, if not in fast mode, release the | |
96 | * freed pages that where gathered up to this point. | |
97 | */ | |
98 | static inline void | |
99 | ia64_tlb_flush_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end) | |
100 | { | |
29eb7782 | 101 | unsigned long i; |
1da177e4 LT |
102 | unsigned int nr; |
103 | ||
104 | if (!tlb->need_flush) | |
105 | return; | |
106 | tlb->need_flush = 0; | |
107 | ||
108 | if (tlb->fullmm) { | |
109 | /* | |
110 | * Tearing down the entire address space. This happens both as a result | |
111 | * of exit() and execve(). The latter case necessitates the call to | |
112 | * flush_tlb_mm() here. | |
113 | */ | |
114 | flush_tlb_mm(tlb->mm); | |
115 | } else if (unlikely (end - start >= 1024*1024*1024*1024UL | |
116 | || REGION_NUMBER(start) != REGION_NUMBER(end - 1))) | |
117 | { | |
118 | /* | |
119 | * If we flush more than a tera-byte or across regions, we're probably | |
120 | * better off just flushing the entire TLB(s). This should be very rare | |
121 | * and is not worth optimizing for. | |
122 | */ | |
123 | flush_tlb_all(); | |
124 | } else { | |
125 | /* | |
126 | * XXX fix me: flush_tlb_range() should take an mm pointer instead of a | |
127 | * vma pointer. | |
128 | */ | |
129 | struct vm_area_struct vma; | |
130 | ||
131 | vma.vm_mm = tlb->mm; | |
132 | /* flush the address range from the tlb: */ | |
133 | flush_tlb_range(&vma, start, end); | |
134 | /* now flush the virt. page-table area mapping the address range: */ | |
135 | flush_tlb_range(&vma, ia64_thash(start), ia64_thash(end)); | |
136 | } | |
137 | ||
138 | /* lastly, release the freed pages */ | |
139 | nr = tlb->nr; | |
29eb7782 PZ |
140 | |
141 | tlb->nr = 0; | |
142 | tlb->start_addr = ~0UL; | |
143 | for (i = 0; i < nr; ++i) | |
144 | free_page_and_swap_cache(tlb->pages[i]); | |
1da177e4 LT |
145 | } |
146 | ||
7a95a2c8 | 147 | static inline void __tlb_alloc_page(struct mmu_gather *tlb) |
1da177e4 | 148 | { |
7a95a2c8 | 149 | unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0); |
1da177e4 | 150 | |
7a95a2c8 PZ |
151 | if (addr) { |
152 | tlb->pages = (void *)addr; | |
153 | tlb->max = PAGE_SIZE / sizeof(void *); | |
154 | } | |
155 | } | |
156 | ||
157 | ||
158 | static inline void | |
2b047252 | 159 | tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end) |
7a95a2c8 | 160 | { |
1da177e4 | 161 | tlb->mm = mm; |
7a95a2c8 PZ |
162 | tlb->max = ARRAY_SIZE(tlb->local); |
163 | tlb->pages = tlb->local; | |
29eb7782 | 164 | tlb->nr = 0; |
2b047252 LT |
165 | tlb->fullmm = !(start | (end+1)); |
166 | tlb->start = start; | |
167 | tlb->end = end; | |
1da177e4 | 168 | tlb->start_addr = ~0UL; |
1da177e4 LT |
169 | } |
170 | ||
171 | /* | |
172 | * Called at the end of the shootdown operation to free up any resources that were | |
15a23ffa | 173 | * collected. |
1da177e4 LT |
174 | */ |
175 | static inline void | |
7a95a2c8 | 176 | tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) |
1da177e4 | 177 | { |
1da177e4 LT |
178 | /* |
179 | * Note: tlb->nr may be 0 at this point, so we can't rely on tlb->start_addr and | |
180 | * tlb->end_addr. | |
181 | */ | |
182 | ia64_tlb_flush_mmu(tlb, start, end); | |
183 | ||
184 | /* keep the page table cache within bounds */ | |
185 | check_pgt_cache(); | |
15a23ffa | 186 | |
7a95a2c8 PZ |
187 | if (tlb->pages != tlb->local) |
188 | free_pages((unsigned long)tlb->pages, 0); | |
1da177e4 LT |
189 | } |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Logically, this routine frees PAGE. On MP machines, the actual freeing of the page | |
193 | * must be delayed until after the TLB has been flushed (see comments at the beginning of | |
194 | * this file). | |
195 | */ | |
7a95a2c8 | 196 | static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) |
1da177e4 LT |
197 | { |
198 | tlb->need_flush = 1; | |
199 | ||
7a95a2c8 PZ |
200 | if (!tlb->nr && tlb->pages == tlb->local) |
201 | __tlb_alloc_page(tlb); | |
202 | ||
1da177e4 | 203 | tlb->pages[tlb->nr++] = page; |
7a95a2c8 PZ |
204 | VM_BUG_ON(tlb->nr > tlb->max); |
205 | ||
206 | return tlb->max - tlb->nr; | |
207 | } | |
208 | ||
209 | static inline void tlb_flush_mmu(struct mmu_gather *tlb) | |
210 | { | |
211 | ia64_tlb_flush_mmu(tlb, tlb->start_addr, tlb->end_addr); | |
212 | } | |
213 | ||
214 | static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) | |
215 | { | |
216 | if (!__tlb_remove_page(tlb, page)) | |
217 | tlb_flush_mmu(tlb); | |
1da177e4 LT |
218 | } |
219 | ||
220 | /* | |
221 | * Remove TLB entry for PTE mapped at virtual address ADDRESS. This is called for any | |
222 | * PTE, not just those pointing to (normal) physical memory. | |
223 | */ | |
224 | static inline void | |
225 | __tlb_remove_tlb_entry (struct mmu_gather *tlb, pte_t *ptep, unsigned long address) | |
226 | { | |
227 | if (tlb->start_addr == ~0UL) | |
228 | tlb->start_addr = address; | |
229 | tlb->end_addr = address + PAGE_SIZE; | |
230 | } | |
231 | ||
232 | #define tlb_migrate_finish(mm) platform_tlb_migrate_finish(mm) | |
233 | ||
234 | #define tlb_start_vma(tlb, vma) do { } while (0) | |
235 | #define tlb_end_vma(tlb, vma) do { } while (0) | |
236 | ||
237 | #define tlb_remove_tlb_entry(tlb, ptep, addr) \ | |
238 | do { \ | |
239 | tlb->need_flush = 1; \ | |
240 | __tlb_remove_tlb_entry(tlb, ptep, addr); \ | |
241 | } while (0) | |
242 | ||
9e1b32ca | 243 | #define pte_free_tlb(tlb, ptep, address) \ |
1da177e4 LT |
244 | do { \ |
245 | tlb->need_flush = 1; \ | |
9e1b32ca | 246 | __pte_free_tlb(tlb, ptep, address); \ |
1da177e4 LT |
247 | } while (0) |
248 | ||
9e1b32ca | 249 | #define pmd_free_tlb(tlb, ptep, address) \ |
1da177e4 LT |
250 | do { \ |
251 | tlb->need_flush = 1; \ | |
9e1b32ca | 252 | __pmd_free_tlb(tlb, ptep, address); \ |
1da177e4 LT |
253 | } while (0) |
254 | ||
9e1b32ca | 255 | #define pud_free_tlb(tlb, pudp, address) \ |
1da177e4 LT |
256 | do { \ |
257 | tlb->need_flush = 1; \ | |
9e1b32ca | 258 | __pud_free_tlb(tlb, pudp, address); \ |
1da177e4 LT |
259 | } while (0) |
260 | ||
261 | #endif /* _ASM_IA64_TLB_H */ |