Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 1 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 2 | #include <linux/gfp.h> |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 3 | #include <asm/pgalloc.h> |
Jeremy Fitzhardinge | ee5aa8d | 2008-03-17 16:37:03 -0700 | [diff] [blame] | 4 | #include <asm/pgtable.h> |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 5 | #include <asm/tlb.h> |
Ingo Molnar | a1d5a86 | 2008-06-20 15:34:46 +0200 | [diff] [blame] | 6 | #include <asm/fixmap.h> |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 7 | |
Vegard Nossum | 9e73023 | 2009-02-22 11:28:25 +0100 | [diff] [blame] | 8 | #define PGALLOC_GFP GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO |
| 9 | |
Ian Campbell | 1431559 | 2010-02-17 10:38:10 +0000 | [diff] [blame] | 10 | #ifdef CONFIG_HIGHPTE |
| 11 | #define PGALLOC_USER_GFP __GFP_HIGHMEM |
| 12 | #else |
| 13 | #define PGALLOC_USER_GFP 0 |
| 14 | #endif |
| 15 | |
| 16 | gfp_t __userpte_alloc_gfp = PGALLOC_GFP | PGALLOC_USER_GFP; |
| 17 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 18 | pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
| 19 | { |
Vegard Nossum | 9e73023 | 2009-02-22 11:28:25 +0100 | [diff] [blame] | 20 | return (pte_t *)__get_free_page(PGALLOC_GFP); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 21 | } |
| 22 | |
| 23 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
| 24 | { |
| 25 | struct page *pte; |
| 26 | |
Ian Campbell | 1431559 | 2010-02-17 10:38:10 +0000 | [diff] [blame] | 27 | pte = alloc_pages(__userpte_alloc_gfp, 0); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 28 | if (pte) |
| 29 | pgtable_page_ctor(pte); |
| 30 | return pte; |
| 31 | } |
| 32 | |
Ian Campbell | 1431559 | 2010-02-17 10:38:10 +0000 | [diff] [blame] | 33 | static int __init setup_userpte(char *arg) |
| 34 | { |
| 35 | if (!arg) |
| 36 | return -EINVAL; |
| 37 | |
| 38 | /* |
| 39 | * "userpte=nohigh" disables allocation of user pagetables in |
| 40 | * high memory. |
| 41 | */ |
| 42 | if (strcmp(arg, "nohigh") == 0) |
| 43 | __userpte_alloc_gfp &= ~__GFP_HIGHMEM; |
| 44 | else |
| 45 | return -EINVAL; |
| 46 | return 0; |
| 47 | } |
| 48 | early_param("userpte", setup_userpte); |
| 49 | |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 50 | void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte) |
Jeremy Fitzhardinge | 397f687 | 2008-03-17 16:36:57 -0700 | [diff] [blame] | 51 | { |
| 52 | pgtable_page_dtor(pte); |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 53 | paravirt_release_pte(page_to_pfn(pte)); |
Jeremy Fitzhardinge | 397f687 | 2008-03-17 16:36:57 -0700 | [diff] [blame] | 54 | tlb_remove_page(tlb, pte); |
| 55 | } |
| 56 | |
Jeremy Fitzhardinge | 170fdff | 2008-03-17 16:36:58 -0700 | [diff] [blame] | 57 | #if PAGETABLE_LEVELS > 2 |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 58 | void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd) |
Jeremy Fitzhardinge | 170fdff | 2008-03-17 16:36:58 -0700 | [diff] [blame] | 59 | { |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 60 | paravirt_release_pmd(__pa(pmd) >> PAGE_SHIFT); |
Jeremy Fitzhardinge | 170fdff | 2008-03-17 16:36:58 -0700 | [diff] [blame] | 61 | tlb_remove_page(tlb, virt_to_page(pmd)); |
| 62 | } |
Jeremy Fitzhardinge | 5a5f8f4 | 2008-03-17 16:36:59 -0700 | [diff] [blame] | 63 | |
| 64 | #if PAGETABLE_LEVELS > 3 |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 65 | void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud) |
Jeremy Fitzhardinge | 5a5f8f4 | 2008-03-17 16:36:59 -0700 | [diff] [blame] | 66 | { |
Jeremy Fitzhardinge | 2761fa0 | 2008-03-17 16:37:02 -0700 | [diff] [blame] | 67 | paravirt_release_pud(__pa(pud) >> PAGE_SHIFT); |
Jeremy Fitzhardinge | 5a5f8f4 | 2008-03-17 16:36:59 -0700 | [diff] [blame] | 68 | tlb_remove_page(tlb, virt_to_page(pud)); |
| 69 | } |
| 70 | #endif /* PAGETABLE_LEVELS > 3 */ |
Jeremy Fitzhardinge | 170fdff | 2008-03-17 16:36:58 -0700 | [diff] [blame] | 71 | #endif /* PAGETABLE_LEVELS > 2 */ |
| 72 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 73 | static inline void pgd_list_add(pgd_t *pgd) |
| 74 | { |
| 75 | struct page *page = virt_to_page(pgd); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 76 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 77 | list_add(&page->lru, &pgd_list); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | static inline void pgd_list_del(pgd_t *pgd) |
| 81 | { |
| 82 | struct page *page = virt_to_page(pgd); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 83 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 84 | list_del(&page->lru); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 85 | } |
| 86 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 87 | #define UNSHARED_PTRS_PER_PGD \ |
Jeremy Fitzhardinge | 68db065 | 2008-03-17 16:37:13 -0700 | [diff] [blame] | 88 | (SHARED_KERNEL_PMD ? KERNEL_PGD_BOUNDARY : PTRS_PER_PGD) |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 89 | |
Jeremy Fitzhardinge | 617d34d | 2010-09-21 12:01:51 -0700 | [diff] [blame^] | 90 | |
| 91 | static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm) |
| 92 | { |
| 93 | BUILD_BUG_ON(sizeof(virt_to_page(pgd)->index) < sizeof(mm)); |
| 94 | virt_to_page(pgd)->index = (pgoff_t)mm; |
| 95 | } |
| 96 | |
| 97 | struct mm_struct *pgd_page_get_mm(struct page *page) |
| 98 | { |
| 99 | return (struct mm_struct *)page->index; |
| 100 | } |
| 101 | |
| 102 | static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd) |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 103 | { |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 104 | /* If the pgd points to a shared pagetable level (either the |
| 105 | ptes in non-PAE, or shared PMD in PAE), then just copy the |
| 106 | references from swapper_pg_dir. */ |
| 107 | if (PAGETABLE_LEVELS == 2 || |
Jeremy Fitzhardinge | 85958b4 | 2008-03-17 16:37:14 -0700 | [diff] [blame] | 108 | (PAGETABLE_LEVELS == 3 && SHARED_KERNEL_PMD) || |
| 109 | PAGETABLE_LEVELS == 4) { |
Jeremy Fitzhardinge | 68db065 | 2008-03-17 16:37:13 -0700 | [diff] [blame] | 110 | clone_pgd_range(pgd + KERNEL_PGD_BOUNDARY, |
| 111 | swapper_pg_dir + KERNEL_PGD_BOUNDARY, |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 112 | KERNEL_PGD_PTRS); |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 113 | paravirt_alloc_pmd_clone(__pa(pgd) >> PAGE_SHIFT, |
| 114 | __pa(swapper_pg_dir) >> PAGE_SHIFT, |
Jeremy Fitzhardinge | 68db065 | 2008-03-17 16:37:13 -0700 | [diff] [blame] | 115 | KERNEL_PGD_BOUNDARY, |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 116 | KERNEL_PGD_PTRS); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | /* list required to sync kernel mapping updates */ |
Jeremy Fitzhardinge | 617d34d | 2010-09-21 12:01:51 -0700 | [diff] [blame^] | 120 | if (!SHARED_KERNEL_PMD) { |
| 121 | pgd_set_mm(pgd, mm); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 122 | pgd_list_add(pgd); |
Jeremy Fitzhardinge | 617d34d | 2010-09-21 12:01:51 -0700 | [diff] [blame^] | 123 | } |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 124 | } |
| 125 | |
Jan Beulich | 17b7462 | 2008-08-29 12:51:32 +0100 | [diff] [blame] | 126 | static void pgd_dtor(pgd_t *pgd) |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 127 | { |
| 128 | unsigned long flags; /* can be called from interrupt context */ |
| 129 | |
| 130 | if (SHARED_KERNEL_PMD) |
| 131 | return; |
| 132 | |
| 133 | spin_lock_irqsave(&pgd_lock, flags); |
| 134 | pgd_list_del(pgd); |
| 135 | spin_unlock_irqrestore(&pgd_lock, flags); |
| 136 | } |
| 137 | |
Jeremy Fitzhardinge | 85958b4 | 2008-03-17 16:37:14 -0700 | [diff] [blame] | 138 | /* |
| 139 | * List of all pgd's needed for non-PAE so it can invalidate entries |
| 140 | * in both cached and uncached pgd's; not needed for PAE since the |
| 141 | * kernel pmd is shared. If PAE were not to share the pmd a similar |
| 142 | * tactic would be needed. This is essentially codepath-based locking |
| 143 | * against pageattr.c; it is the unique case in which a valid change |
| 144 | * of kernel pagetables can't be lazily synchronized by vmalloc faults. |
| 145 | * vmalloc faults work because attached pagetables are never freed. |
| 146 | * -- wli |
| 147 | */ |
| 148 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 149 | #ifdef CONFIG_X86_PAE |
| 150 | /* |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 151 | * In PAE mode, we need to do a cr3 reload (=tlb flush) when |
| 152 | * updating the top-level pagetable entries to guarantee the |
| 153 | * processor notices the update. Since this is expensive, and |
| 154 | * all 4 top-level entries are used almost immediately in a |
| 155 | * new process's life, we just pre-populate them here. |
| 156 | * |
| 157 | * Also, if we're in a paravirt environment where the kernel pmd is |
| 158 | * not shared between pagetables (!SHARED_KERNEL_PMDS), we allocate |
| 159 | * and initialize the kernel pmds here. |
| 160 | */ |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 161 | #define PREALLOCATED_PMDS UNSHARED_PTRS_PER_PGD |
Ingo Molnar | 1ec1fe7 | 2008-03-19 20:30:40 +0100 | [diff] [blame] | 162 | |
| 163 | void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd) |
| 164 | { |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 165 | paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); |
Ingo Molnar | 1ec1fe7 | 2008-03-19 20:30:40 +0100 | [diff] [blame] | 166 | |
| 167 | /* Note: almost everything apart from _PAGE_PRESENT is |
| 168 | reserved at the pmd (PDPT) level. */ |
| 169 | set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT)); |
| 170 | |
| 171 | /* |
| 172 | * According to Intel App note "TLBs, Paging-Structure Caches, |
| 173 | * and Their Invalidation", April 2007, document 317080-001, |
| 174 | * section 8.1: in PAE mode we explicitly have to flush the |
| 175 | * TLB via cr3 if the top-level pgd is changed... |
| 176 | */ |
| 177 | if (mm == current->active_mm) |
| 178 | write_cr3(read_cr3()); |
| 179 | } |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 180 | #else /* !CONFIG_X86_PAE */ |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 181 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 182 | /* No need to prepopulate any pagetable entries in non-PAE modes. */ |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 183 | #define PREALLOCATED_PMDS 0 |
| 184 | |
| 185 | #endif /* CONFIG_X86_PAE */ |
| 186 | |
| 187 | static void free_pmds(pmd_t *pmds[]) |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 188 | { |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 189 | int i; |
| 190 | |
| 191 | for(i = 0; i < PREALLOCATED_PMDS; i++) |
| 192 | if (pmds[i]) |
| 193 | free_page((unsigned long)pmds[i]); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 194 | } |
| 195 | |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 196 | static int preallocate_pmds(pmd_t *pmds[]) |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 197 | { |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 198 | int i; |
| 199 | bool failed = false; |
| 200 | |
| 201 | for(i = 0; i < PREALLOCATED_PMDS; i++) { |
Vegard Nossum | 9e73023 | 2009-02-22 11:28:25 +0100 | [diff] [blame] | 202 | pmd_t *pmd = (pmd_t *)__get_free_page(PGALLOC_GFP); |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 203 | if (pmd == NULL) |
| 204 | failed = true; |
| 205 | pmds[i] = pmd; |
| 206 | } |
| 207 | |
| 208 | if (failed) { |
| 209 | free_pmds(pmds); |
| 210 | return -ENOMEM; |
| 211 | } |
| 212 | |
| 213 | return 0; |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 214 | } |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 215 | |
| 216 | /* |
| 217 | * Mop up any pmd pages which may still be attached to the pgd. |
| 218 | * Normally they will be freed by munmap/exit_mmap, but any pmd we |
| 219 | * preallocate which never got a corresponding vma will need to be |
| 220 | * freed manually. |
| 221 | */ |
| 222 | static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp) |
| 223 | { |
| 224 | int i; |
| 225 | |
| 226 | for(i = 0; i < PREALLOCATED_PMDS; i++) { |
| 227 | pgd_t pgd = pgdp[i]; |
| 228 | |
| 229 | if (pgd_val(pgd) != 0) { |
| 230 | pmd_t *pmd = (pmd_t *)pgd_page_vaddr(pgd); |
| 231 | |
| 232 | pgdp[i] = native_make_pgd(0); |
| 233 | |
| 234 | paravirt_release_pmd(pgd_val(pgd) >> PAGE_SHIFT); |
| 235 | pmd_free(mm, pmd); |
| 236 | } |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[]) |
| 241 | { |
| 242 | pud_t *pud; |
| 243 | unsigned long addr; |
| 244 | int i; |
| 245 | |
Jeremy Fitzhardinge | cf3e505 | 2008-08-08 13:46:07 -0700 | [diff] [blame] | 246 | if (PREALLOCATED_PMDS == 0) /* Work around gcc-3.4.x bug */ |
| 247 | return; |
| 248 | |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 249 | pud = pud_offset(pgd, 0); |
| 250 | |
| 251 | for (addr = i = 0; i < PREALLOCATED_PMDS; |
| 252 | i++, pud++, addr += PUD_SIZE) { |
| 253 | pmd_t *pmd = pmds[i]; |
| 254 | |
| 255 | if (i >= KERNEL_PGD_BOUNDARY) |
| 256 | memcpy(pmd, (pmd_t *)pgd_page_vaddr(swapper_pg_dir[i]), |
| 257 | sizeof(pmd_t) * PTRS_PER_PMD); |
| 258 | |
| 259 | pud_populate(mm, pud, pmd); |
| 260 | } |
| 261 | } |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 262 | |
| 263 | pgd_t *pgd_alloc(struct mm_struct *mm) |
| 264 | { |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 265 | pgd_t *pgd; |
| 266 | pmd_t *pmds[PREALLOCATED_PMDS]; |
| 267 | unsigned long flags; |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 268 | |
Vegard Nossum | 9e73023 | 2009-02-22 11:28:25 +0100 | [diff] [blame] | 269 | pgd = (pgd_t *)__get_free_page(PGALLOC_GFP); |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 270 | |
| 271 | if (pgd == NULL) |
| 272 | goto out; |
| 273 | |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 274 | mm->pgd = pgd; |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 275 | |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 276 | if (preallocate_pmds(pmds) != 0) |
| 277 | goto out_free_pgd; |
| 278 | |
| 279 | if (paravirt_pgd_alloc(mm) != 0) |
| 280 | goto out_free_pmds; |
| 281 | |
| 282 | /* |
| 283 | * Make sure that pre-populating the pmds is atomic with |
| 284 | * respect to anything walking the pgd_list, so that they |
| 285 | * never see a partially populated pgd. |
| 286 | */ |
| 287 | spin_lock_irqsave(&pgd_lock, flags); |
| 288 | |
Jeremy Fitzhardinge | 617d34d | 2010-09-21 12:01:51 -0700 | [diff] [blame^] | 289 | pgd_ctor(mm, pgd); |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 290 | pgd_prepopulate_pmd(mm, pgd, pmds); |
| 291 | |
| 292 | spin_unlock_irqrestore(&pgd_lock, flags); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 293 | |
| 294 | return pgd; |
Jeremy Fitzhardinge | d8d5900 | 2008-06-25 00:19:13 -0400 | [diff] [blame] | 295 | |
| 296 | out_free_pmds: |
| 297 | free_pmds(pmds); |
| 298 | out_free_pgd: |
| 299 | free_page((unsigned long)pgd); |
| 300 | out: |
| 301 | return NULL; |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
| 305 | { |
| 306 | pgd_mop_up_pmds(mm, pgd); |
| 307 | pgd_dtor(pgd); |
Jeremy Fitzhardinge | eba0045 | 2008-06-25 00:19:12 -0400 | [diff] [blame] | 308 | paravirt_pgd_free(mm, pgd); |
Jeremy Fitzhardinge | 4f76cd3 | 2008-03-17 16:36:55 -0700 | [diff] [blame] | 309 | free_page((unsigned long)pgd); |
| 310 | } |
Jeremy Fitzhardinge | ee5aa8d | 2008-03-17 16:37:03 -0700 | [diff] [blame] | 311 | |
| 312 | int ptep_set_access_flags(struct vm_area_struct *vma, |
| 313 | unsigned long address, pte_t *ptep, |
| 314 | pte_t entry, int dirty) |
| 315 | { |
| 316 | int changed = !pte_same(*ptep, entry); |
| 317 | |
| 318 | if (changed && dirty) { |
| 319 | *ptep = entry; |
| 320 | pte_update_defer(vma->vm_mm, address, ptep); |
| 321 | flush_tlb_page(vma, address); |
| 322 | } |
| 323 | |
| 324 | return changed; |
| 325 | } |
Jeremy Fitzhardinge | f9fbf1a | 2008-03-17 16:37:04 -0700 | [diff] [blame] | 326 | |
| 327 | int ptep_test_and_clear_young(struct vm_area_struct *vma, |
| 328 | unsigned long addr, pte_t *ptep) |
| 329 | { |
| 330 | int ret = 0; |
| 331 | |
| 332 | if (pte_young(*ptep)) |
| 333 | ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, |
Thomas Gleixner | 48e2395 | 2008-05-24 17:24:34 +0200 | [diff] [blame] | 334 | (unsigned long *) &ptep->pte); |
Jeremy Fitzhardinge | f9fbf1a | 2008-03-17 16:37:04 -0700 | [diff] [blame] | 335 | |
| 336 | if (ret) |
| 337 | pte_update(vma->vm_mm, addr, ptep); |
| 338 | |
| 339 | return ret; |
| 340 | } |
Jeremy Fitzhardinge | c20311e | 2008-03-17 16:37:05 -0700 | [diff] [blame] | 341 | |
| 342 | int ptep_clear_flush_young(struct vm_area_struct *vma, |
| 343 | unsigned long address, pte_t *ptep) |
| 344 | { |
| 345 | int young; |
| 346 | |
| 347 | young = ptep_test_and_clear_young(vma, address, ptep); |
| 348 | if (young) |
| 349 | flush_tlb_page(vma, address); |
| 350 | |
| 351 | return young; |
| 352 | } |
Jeremy Fitzhardinge | 7c7e6e0 | 2008-06-17 11:41:54 -0700 | [diff] [blame] | 353 | |
Gustavo F. Padovan | fd862dd | 2009-02-15 21:48:54 -0300 | [diff] [blame] | 354 | /** |
| 355 | * reserve_top_address - reserves a hole in the top of kernel address space |
| 356 | * @reserve - size of hole to reserve |
| 357 | * |
| 358 | * Can be used to relocate the fixmap area and poke a hole in the top |
| 359 | * of kernel address space to make room for a hypervisor. |
| 360 | */ |
| 361 | void __init reserve_top_address(unsigned long reserve) |
| 362 | { |
| 363 | #ifdef CONFIG_X86_32 |
| 364 | BUG_ON(fixmaps_set > 0); |
| 365 | printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", |
| 366 | (int)-reserve); |
| 367 | __FIXADDR_TOP = -reserve - PAGE_SIZE; |
Gustavo F. Padovan | fd862dd | 2009-02-15 21:48:54 -0300 | [diff] [blame] | 368 | #endif |
| 369 | } |
| 370 | |
Jeremy Fitzhardinge | 7c7e6e0 | 2008-06-17 11:41:54 -0700 | [diff] [blame] | 371 | int fixmaps_set; |
| 372 | |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 373 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte) |
Jeremy Fitzhardinge | 7c7e6e0 | 2008-06-17 11:41:54 -0700 | [diff] [blame] | 374 | { |
| 375 | unsigned long address = __fix_to_virt(idx); |
| 376 | |
| 377 | if (idx >= __end_of_fixed_addresses) { |
| 378 | BUG(); |
| 379 | return; |
| 380 | } |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 381 | set_pte_vaddr(address, pte); |
Jeremy Fitzhardinge | 7c7e6e0 | 2008-06-17 11:41:54 -0700 | [diff] [blame] | 382 | fixmaps_set++; |
| 383 | } |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 384 | |
Masami Hiramatsu | 3b3809a | 2009-04-09 10:55:33 -0700 | [diff] [blame] | 385 | void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys, |
| 386 | pgprot_t flags) |
Jeremy Fitzhardinge | aeaaa59 | 2008-06-17 11:42:01 -0700 | [diff] [blame] | 387 | { |
| 388 | __native_set_fixmap(idx, pfn_pte(phys >> PAGE_SHIFT, flags)); |
| 389 | } |