Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * PPC64 (POWER4) Huge TLB Page Support for Kernel. |
| 3 | * |
| 4 | * Copyright (C) 2003 David Gibson, IBM Corporation. |
| 5 | * |
| 6 | * Based on the IA-32 version: |
| 7 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/fs.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/hugetlb.h> |
| 14 | #include <linux/pagemap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/slab.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/sysctl.h> |
| 18 | #include <asm/mman.h> |
| 19 | #include <asm/pgalloc.h> |
| 20 | #include <asm/tlb.h> |
| 21 | #include <asm/tlbflush.h> |
| 22 | #include <asm/mmu_context.h> |
| 23 | #include <asm/machdep.h> |
| 24 | #include <asm/cputable.h> |
Benjamin Herrenschmidt | 94b2a43 | 2007-03-10 00:05:37 +0100 | [diff] [blame] | 25 | #include <asm/spu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Jon Tollefson | 9122434 | 2008-07-23 21:27:55 -0700 | [diff] [blame] | 27 | #define PAGE_SHIFT_64K 16 |
| 28 | #define PAGE_SHIFT_16M 24 |
| 29 | #define PAGE_SHIFT_16G 34 |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 30 | |
David Gibson | c594ada | 2005-08-11 16:55:21 +1000 | [diff] [blame] | 31 | #define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT) |
| 32 | #define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT) |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 33 | #define MAX_NUMBER_GPAGES 1024 |
| 34 | |
| 35 | /* Tracks the 16G pages after the device tree is scanned and before the |
| 36 | * huge_boot_pages list is ready. */ |
| 37 | static unsigned long gpage_freearray[MAX_NUMBER_GPAGES]; |
| 38 | static unsigned nr_gpages; |
David Gibson | c594ada | 2005-08-11 16:55:21 +1000 | [diff] [blame] | 39 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 40 | /* Flag to mark huge PD pointers. This means pmd_bad() and pud_bad() |
| 41 | * will choke on pointers to hugepte tables, which is handy for |
| 42 | * catching screwups early. */ |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 43 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 44 | static inline int shift_to_mmu_psize(unsigned int shift) |
| 45 | { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 46 | int psize; |
| 47 | |
| 48 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) |
| 49 | if (mmu_psize_defs[psize].shift == shift) |
| 50 | return psize; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 51 | return -1; |
| 52 | } |
| 53 | |
| 54 | static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize) |
| 55 | { |
| 56 | if (mmu_psize_defs[mmu_psize].shift) |
| 57 | return mmu_psize_defs[mmu_psize].shift; |
| 58 | BUG(); |
| 59 | } |
| 60 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 61 | #define hugepd_none(hpd) ((hpd).pd == 0) |
| 62 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 63 | static inline pte_t *hugepd_page(hugepd_t hpd) |
| 64 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 65 | BUG_ON(!hugepd_ok(hpd)); |
| 66 | return (pte_t *)((hpd.pd & ~HUGEPD_SHIFT_MASK) | 0xc000000000000000); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 67 | } |
| 68 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 69 | static inline unsigned int hugepd_shift(hugepd_t hpd) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 70 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 71 | return hpd.pd & HUGEPD_SHIFT_MASK; |
| 72 | } |
| 73 | |
| 74 | static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr, unsigned pdshift) |
| 75 | { |
| 76 | unsigned long idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(*hpdp); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 77 | pte_t *dir = hugepd_page(*hpdp); |
| 78 | |
| 79 | return dir + idx; |
| 80 | } |
| 81 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 82 | pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 83 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 84 | pgd_t *pg; |
| 85 | pud_t *pu; |
| 86 | pmd_t *pm; |
| 87 | hugepd_t *hpdp = NULL; |
| 88 | unsigned pdshift = PGDIR_SHIFT; |
| 89 | |
| 90 | if (shift) |
| 91 | *shift = 0; |
| 92 | |
| 93 | pg = pgdir + pgd_index(ea); |
| 94 | if (is_hugepd(pg)) { |
| 95 | hpdp = (hugepd_t *)pg; |
| 96 | } else if (!pgd_none(*pg)) { |
| 97 | pdshift = PUD_SHIFT; |
| 98 | pu = pud_offset(pg, ea); |
| 99 | if (is_hugepd(pu)) |
| 100 | hpdp = (hugepd_t *)pu; |
| 101 | else if (!pud_none(*pu)) { |
| 102 | pdshift = PMD_SHIFT; |
| 103 | pm = pmd_offset(pu, ea); |
| 104 | if (is_hugepd(pm)) |
| 105 | hpdp = (hugepd_t *)pm; |
| 106 | else if (!pmd_none(*pm)) { |
| 107 | return pte_offset_map(pm, ea); |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | if (!hpdp) |
| 113 | return NULL; |
| 114 | |
| 115 | if (shift) |
| 116 | *shift = hugepd_shift(*hpdp); |
| 117 | return hugepte_offset(hpdp, ea, pdshift); |
| 118 | } |
| 119 | |
| 120 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
| 121 | { |
| 122 | return find_linux_pte_or_hugepte(mm->pgd, addr, NULL); |
| 123 | } |
| 124 | |
| 125 | static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, |
| 126 | unsigned long address, unsigned pdshift, unsigned pshift) |
| 127 | { |
| 128 | pte_t *new = kmem_cache_zalloc(PGT_CACHE(pdshift - pshift), |
David Gibson | a0668cd | 2009-10-28 16:27:18 +0000 | [diff] [blame] | 129 | GFP_KERNEL|__GFP_REPEAT); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 130 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 131 | BUG_ON(pshift > HUGEPD_SHIFT_MASK); |
| 132 | BUG_ON((unsigned long)new & HUGEPD_SHIFT_MASK); |
| 133 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 134 | if (! new) |
| 135 | return -ENOMEM; |
| 136 | |
| 137 | spin_lock(&mm->page_table_lock); |
| 138 | if (!hugepd_none(*hpdp)) |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 139 | kmem_cache_free(PGT_CACHE(pdshift - pshift), new); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 140 | else |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 141 | hpdp->pd = ((unsigned long)new & ~0x8000000000000000) | pshift; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 142 | spin_unlock(&mm->page_table_lock); |
| 143 | return 0; |
| 144 | } |
| 145 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 146 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) |
| 147 | { |
| 148 | pgd_t *pg; |
| 149 | pud_t *pu; |
| 150 | pmd_t *pm; |
| 151 | hugepd_t *hpdp = NULL; |
| 152 | unsigned pshift = __ffs(sz); |
| 153 | unsigned pdshift = PGDIR_SHIFT; |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 154 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 155 | addr &= ~(sz-1); |
| 156 | |
| 157 | pg = pgd_offset(mm, addr); |
| 158 | if (pshift >= PUD_SHIFT) { |
| 159 | hpdp = (hugepd_t *)pg; |
| 160 | } else { |
| 161 | pdshift = PUD_SHIFT; |
| 162 | pu = pud_alloc(mm, pg, addr); |
| 163 | if (pshift >= PMD_SHIFT) { |
| 164 | hpdp = (hugepd_t *)pu; |
| 165 | } else { |
| 166 | pdshift = PMD_SHIFT; |
| 167 | pm = pmd_alloc(mm, pu, addr); |
| 168 | hpdp = (hugepd_t *)pm; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | if (!hpdp) |
| 173 | return NULL; |
| 174 | |
| 175 | BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp)); |
| 176 | |
| 177 | if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr, pdshift, pshift)) |
| 178 | return NULL; |
| 179 | |
| 180 | return hugepte_offset(hpdp, addr, pdshift); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 181 | } |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 182 | |
Jon Tollefson | 658013e | 2008-07-23 21:27:54 -0700 | [diff] [blame] | 183 | /* Build list of addresses of gigantic pages. This function is used in early |
| 184 | * boot before the buddy or bootmem allocator is setup. |
| 185 | */ |
| 186 | void add_gpage(unsigned long addr, unsigned long page_size, |
| 187 | unsigned long number_of_pages) |
| 188 | { |
| 189 | if (!addr) |
| 190 | return; |
| 191 | while (number_of_pages > 0) { |
| 192 | gpage_freearray[nr_gpages] = addr; |
| 193 | nr_gpages++; |
| 194 | number_of_pages--; |
| 195 | addr += page_size; |
| 196 | } |
| 197 | } |
| 198 | |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 199 | /* Moves the gigantic page addresses from the temporary list to the |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 200 | * huge_boot_pages list. |
| 201 | */ |
| 202 | int alloc_bootmem_huge_page(struct hstate *hstate) |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 203 | { |
| 204 | struct huge_bootmem_page *m; |
| 205 | if (nr_gpages == 0) |
| 206 | return 0; |
| 207 | m = phys_to_virt(gpage_freearray[--nr_gpages]); |
| 208 | gpage_freearray[nr_gpages] = 0; |
| 209 | list_add(&m->list, &huge_boot_pages); |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 210 | m->hstate = hstate; |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 211 | return 1; |
| 212 | } |
| 213 | |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 214 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
| 215 | { |
| 216 | return 0; |
| 217 | } |
| 218 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 219 | static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshift, |
| 220 | unsigned long start, unsigned long end, |
| 221 | unsigned long floor, unsigned long ceiling) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 222 | { |
| 223 | pte_t *hugepte = hugepd_page(*hpdp); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 224 | unsigned shift = hugepd_shift(*hpdp); |
| 225 | unsigned long pdmask = ~((1UL << pdshift) - 1); |
| 226 | |
| 227 | start &= pdmask; |
| 228 | if (start < floor) |
| 229 | return; |
| 230 | if (ceiling) { |
| 231 | ceiling &= pdmask; |
| 232 | if (! ceiling) |
| 233 | return; |
| 234 | } |
| 235 | if (end - 1 > ceiling - 1) |
| 236 | return; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 237 | |
| 238 | hpdp->pd = 0; |
| 239 | tlb->need_flush = 1; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 240 | pgtable_free_tlb(tlb, hugepte, pdshift - shift); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 241 | } |
| 242 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 243 | static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, |
| 244 | unsigned long addr, unsigned long end, |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 245 | unsigned long floor, unsigned long ceiling) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 246 | { |
| 247 | pmd_t *pmd; |
| 248 | unsigned long next; |
| 249 | unsigned long start; |
| 250 | |
| 251 | start = addr; |
| 252 | pmd = pmd_offset(pud, addr); |
| 253 | do { |
| 254 | next = pmd_addr_end(addr, end); |
| 255 | if (pmd_none(*pmd)) |
| 256 | continue; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 257 | free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT, |
| 258 | addr, next, floor, ceiling); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 259 | } while (pmd++, addr = next, addr != end); |
| 260 | |
| 261 | start &= PUD_MASK; |
| 262 | if (start < floor) |
| 263 | return; |
| 264 | if (ceiling) { |
| 265 | ceiling &= PUD_MASK; |
| 266 | if (!ceiling) |
| 267 | return; |
| 268 | } |
| 269 | if (end - 1 > ceiling - 1) |
| 270 | return; |
| 271 | |
| 272 | pmd = pmd_offset(pud, start); |
| 273 | pud_clear(pud); |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 274 | pmd_free_tlb(tlb, pmd, start); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 275 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 276 | |
| 277 | static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, |
| 278 | unsigned long addr, unsigned long end, |
| 279 | unsigned long floor, unsigned long ceiling) |
| 280 | { |
| 281 | pud_t *pud; |
| 282 | unsigned long next; |
| 283 | unsigned long start; |
| 284 | |
| 285 | start = addr; |
| 286 | pud = pud_offset(pgd, addr); |
| 287 | do { |
| 288 | next = pud_addr_end(addr, end); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 289 | if (!is_hugepd(pud)) { |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 290 | if (pud_none_or_clear_bad(pud)) |
| 291 | continue; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 292 | hugetlb_free_pmd_range(tlb, pud, addr, next, floor, |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 293 | ceiling); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 294 | } else { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 295 | free_hugepd_range(tlb, (hugepd_t *)pud, PUD_SHIFT, |
| 296 | addr, next, floor, ceiling); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 297 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 298 | } while (pud++, addr = next, addr != end); |
| 299 | |
| 300 | start &= PGDIR_MASK; |
| 301 | if (start < floor) |
| 302 | return; |
| 303 | if (ceiling) { |
| 304 | ceiling &= PGDIR_MASK; |
| 305 | if (!ceiling) |
| 306 | return; |
| 307 | } |
| 308 | if (end - 1 > ceiling - 1) |
| 309 | return; |
| 310 | |
| 311 | pud = pud_offset(pgd, start); |
| 312 | pgd_clear(pgd); |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 313 | pud_free_tlb(tlb, pud, start); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | /* |
| 317 | * This function frees user-level page tables of a process. |
| 318 | * |
| 319 | * Must be called with pagetable lock held. |
| 320 | */ |
Jan Beulich | 42b7772 | 2008-07-23 21:27:10 -0700 | [diff] [blame] | 321 | void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 322 | unsigned long addr, unsigned long end, |
| 323 | unsigned long floor, unsigned long ceiling) |
| 324 | { |
| 325 | pgd_t *pgd; |
| 326 | unsigned long next; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 327 | |
| 328 | /* |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 329 | * Because there are a number of different possible pagetable |
| 330 | * layouts for hugepage ranges, we limit knowledge of how |
| 331 | * things should be laid out to the allocation path |
| 332 | * (huge_pte_alloc(), above). Everything else works out the |
| 333 | * structure as it goes from information in the hugepd |
| 334 | * pointers. That means that we can't here use the |
| 335 | * optimization used in the normal page free_pgd_range(), of |
| 336 | * checking whether we're actually covering a large enough |
| 337 | * range to have to do anything at the top level of the walk |
| 338 | * instead of at the bottom. |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 339 | * |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 340 | * To make sense of this, you should probably go read the big |
| 341 | * block comment at the top of the normal free_pgd_range(), |
| 342 | * too. |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 343 | */ |
| 344 | |
Jan Beulich | 42b7772 | 2008-07-23 21:27:10 -0700 | [diff] [blame] | 345 | pgd = pgd_offset(tlb->mm, addr); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 346 | do { |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 347 | next = pgd_addr_end(addr, end); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 348 | if (!is_hugepd(pgd)) { |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 349 | if (pgd_none_or_clear_bad(pgd)) |
| 350 | continue; |
| 351 | hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling); |
| 352 | } else { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 353 | free_hugepd_range(tlb, (hugepd_t *)pgd, PGDIR_SHIFT, |
| 354 | addr, next, floor, ceiling); |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 355 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 356 | } while (pgd++, addr = next, addr != end); |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 357 | } |
| 358 | |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 359 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
| 360 | pte_t *ptep, pte_t pte) |
| 361 | { |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 362 | if (pte_present(*ptep)) { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 363 | /* We open-code pte_clear because we need to pass the right |
Benjamin Herrenschmidt | a741e67 | 2007-04-10 17:09:37 +1000 | [diff] [blame] | 364 | * argument to hpte_need_flush (huge / !huge). Might not be |
| 365 | * necessary anymore if we make hpte_need_flush() get the |
| 366 | * page size from the slices |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 367 | */ |
David Gibson | f71dc17 | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 368 | pte_update(mm, addr, ptep, ~0UL, 1); |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 369 | } |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 370 | *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS); |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, |
| 374 | pte_t *ptep) |
| 375 | { |
Benjamin Herrenschmidt | a741e67 | 2007-04-10 17:09:37 +1000 | [diff] [blame] | 376 | unsigned long old = pte_update(mm, addr, ptep, ~0UL, 1); |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 377 | return __pte(old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | struct page * |
| 381 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) |
| 382 | { |
| 383 | pte_t *ptep; |
| 384 | struct page *page; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 385 | unsigned shift; |
| 386 | unsigned long mask; |
| 387 | |
| 388 | ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 390 | /* Verify it is a huge page else bail. */ |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 391 | if (!ptep || !shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | return ERR_PTR(-EINVAL); |
| 393 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 394 | mask = (1UL << shift) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | page = pte_page(*ptep); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 396 | if (page) |
| 397 | page += (address & mask) / PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | return page; |
| 400 | } |
| 401 | |
| 402 | int pmd_huge(pmd_t pmd) |
| 403 | { |
| 404 | return 0; |
| 405 | } |
| 406 | |
Andi Kleen | ceb8687 | 2008-07-23 21:27:50 -0700 | [diff] [blame] | 407 | int pud_huge(pud_t pud) |
| 408 | { |
| 409 | return 0; |
| 410 | } |
| 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | struct page * |
| 413 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, |
| 414 | pmd_t *pmd, int write) |
| 415 | { |
| 416 | BUG(); |
| 417 | return NULL; |
| 418 | } |
| 419 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 420 | static noinline int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, |
| 421 | unsigned long end, int write, struct page **pages, int *nr) |
| 422 | { |
| 423 | unsigned long mask; |
| 424 | unsigned long pte_end; |
| 425 | struct page *head, *page; |
| 426 | pte_t pte; |
| 427 | int refs; |
| 428 | |
| 429 | pte_end = (addr + sz) & ~(sz-1); |
| 430 | if (pte_end < end) |
| 431 | end = pte_end; |
| 432 | |
| 433 | pte = *ptep; |
| 434 | mask = _PAGE_PRESENT | _PAGE_USER; |
| 435 | if (write) |
| 436 | mask |= _PAGE_RW; |
| 437 | |
| 438 | if ((pte_val(pte) & mask) != mask) |
| 439 | return 0; |
| 440 | |
| 441 | /* hugepages are never "special" */ |
| 442 | VM_BUG_ON(!pfn_valid(pte_pfn(pte))); |
| 443 | |
| 444 | refs = 0; |
| 445 | head = pte_page(pte); |
| 446 | |
| 447 | page = head + ((addr & (sz-1)) >> PAGE_SHIFT); |
| 448 | do { |
| 449 | VM_BUG_ON(compound_head(page) != head); |
| 450 | pages[*nr] = page; |
| 451 | (*nr)++; |
| 452 | page++; |
| 453 | refs++; |
| 454 | } while (addr += PAGE_SIZE, addr != end); |
| 455 | |
| 456 | if (!page_cache_add_speculative(head, refs)) { |
| 457 | *nr -= refs; |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | if (unlikely(pte_val(pte) != pte_val(*ptep))) { |
| 462 | /* Could be optimized better */ |
| 463 | while (*nr) { |
| 464 | put_page(page); |
| 465 | (*nr)--; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | return 1; |
| 470 | } |
| 471 | |
| 472 | int gup_hugepd(hugepd_t *hugepd, unsigned pdshift, |
| 473 | unsigned long addr, unsigned long end, |
| 474 | int write, struct page **pages, int *nr) |
| 475 | { |
| 476 | pte_t *ptep; |
| 477 | unsigned long sz = 1UL << hugepd_shift(*hugepd); |
| 478 | |
| 479 | ptep = hugepte_offset(hugepd, addr, pdshift); |
| 480 | do { |
| 481 | if (!gup_hugepte(ptep, sz, addr, end, write, pages, nr)) |
| 482 | return 0; |
| 483 | } while (ptep++, addr += sz, addr != end); |
| 484 | |
| 485 | return 1; |
| 486 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
| 488 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
| 489 | unsigned long len, unsigned long pgoff, |
| 490 | unsigned long flags) |
| 491 | { |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 492 | struct hstate *hstate = hstate_file(file); |
| 493 | int mmu_psize = shift_to_mmu_psize(huge_page_shift(hstate)); |
Brian King | 48f797d | 2008-12-04 04:07:54 +0000 | [diff] [blame] | 494 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 495 | return slice_get_unmapped_area(addr, len, flags, mmu_psize, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | } |
| 497 | |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 498 | unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) |
| 499 | { |
| 500 | unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start); |
| 501 | |
| 502 | return 1UL << mmu_psize_to_shift(psize); |
| 503 | } |
| 504 | |
David Gibson | cbf52af | 2005-12-09 14:20:52 +1100 | [diff] [blame] | 505 | /* |
| 506 | * Called by asm hashtable.S for doing lazy icache flush |
| 507 | */ |
| 508 | static unsigned int hash_huge_page_do_lazy_icache(unsigned long rflags, |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 509 | pte_t pte, int trap, unsigned long sz) |
David Gibson | cbf52af | 2005-12-09 14:20:52 +1100 | [diff] [blame] | 510 | { |
| 511 | struct page *page; |
| 512 | int i; |
| 513 | |
| 514 | if (!pfn_valid(pte_pfn(pte))) |
| 515 | return rflags; |
| 516 | |
| 517 | page = pte_page(pte); |
| 518 | |
| 519 | /* page is dirty */ |
| 520 | if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) { |
| 521 | if (trap == 0x400) { |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 522 | for (i = 0; i < (sz / PAGE_SIZE); i++) |
David Gibson | cbf52af | 2005-12-09 14:20:52 +1100 | [diff] [blame] | 523 | __flush_dcache_icache(page_address(page+i)); |
| 524 | set_bit(PG_arch_1, &page->flags); |
| 525 | } else { |
| 526 | rflags |= HPTE_R_N; |
| 527 | } |
| 528 | } |
| 529 | return rflags; |
| 530 | } |
| 531 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 532 | int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid, |
| 533 | pte_t *ptep, unsigned long trap, int local, int ssize, |
| 534 | unsigned int shift, unsigned int mmu_psize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 536 | unsigned long old_pte, new_pte; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 537 | unsigned long va, rflags, pa, sz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | long slot; |
| 539 | int err = 1; |
| 540 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 541 | BUG_ON(shift != mmu_psize_defs[mmu_psize].shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
| 543 | /* Search the Linux page table for a match with va */ |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 544 | va = hpt_va(ea, vsid, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | /* |
| 547 | * Check the user's access rights to the page. If access should be |
| 548 | * prevented then send the problem up to do_page_fault. |
| 549 | */ |
| 550 | if (unlikely(access & ~pte_val(*ptep))) |
| 551 | goto out; |
| 552 | /* |
| 553 | * At this point, we have a pte (old_pte) which can be used to build |
| 554 | * or update an HPTE. There are 2 cases: |
| 555 | * |
| 556 | * 1. There is a valid (present) pte with no associated HPTE (this is |
| 557 | * the most common case) |
| 558 | * 2. There is a valid (present) pte with an associated HPTE. The |
| 559 | * current values of the pp bits in the HPTE prevent access |
| 560 | * because we are doing software DIRTY bit management and the |
| 561 | * page is currently not DIRTY. |
| 562 | */ |
| 563 | |
| 564 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 565 | do { |
| 566 | old_pte = pte_val(*ptep); |
| 567 | if (old_pte & _PAGE_BUSY) |
| 568 | goto out; |
Benjamin Herrenschmidt | 41743a4 | 2008-06-11 15:37:10 +1000 | [diff] [blame] | 569 | new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 570 | } while(old_pte != __cmpxchg_u64((unsigned long *)ptep, |
| 571 | old_pte, new_pte)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 573 | rflags = 0x2 | (!(new_pte & _PAGE_RW)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | /* _PAGE_EXEC -> HW_NO_EXEC since it's inverted */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 575 | rflags |= ((new_pte & _PAGE_EXEC) ? 0 : HPTE_R_N); |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 576 | sz = ((1UL) << shift); |
David Gibson | cbf52af | 2005-12-09 14:20:52 +1100 | [diff] [blame] | 577 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
| 578 | /* No CPU has hugepages but lacks no execute, so we |
| 579 | * don't need to worry about that case */ |
| 580 | rflags = hash_huge_page_do_lazy_icache(rflags, __pte(old_pte), |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 581 | trap, sz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | /* Check if pte already has an hpte (case 2) */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 584 | if (unlikely(old_pte & _PAGE_HASHPTE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | /* There MIGHT be an HPTE for this pte */ |
| 586 | unsigned long hash, slot; |
| 587 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 588 | hash = hpt_hash(va, shift, ssize); |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 589 | if (old_pte & _PAGE_F_SECOND) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | hash = ~hash; |
| 591 | slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 592 | slot += (old_pte & _PAGE_F_GIX) >> 12; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 594 | if (ppc_md.hpte_updatepp(slot, rflags, va, mmu_psize, |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 595 | ssize, local) == -1) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 596 | old_pte &= ~_PAGE_HPTEFLAGS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 599 | if (likely(!(old_pte & _PAGE_HASHPTE))) { |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 600 | unsigned long hash = hpt_hash(va, shift, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | unsigned long hpte_group; |
| 602 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 603 | pa = pte_pfn(__pte(old_pte)) << PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | repeat: |
| 606 | hpte_group = ((hash & htab_hash_mask) * |
| 607 | HPTES_PER_GROUP) & ~0x7UL; |
| 608 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 609 | /* clear HPTE slot informations in new PTE */ |
Benjamin Herrenschmidt | 41743a4 | 2008-06-11 15:37:10 +1000 | [diff] [blame] | 610 | #ifdef CONFIG_PPC_64K_PAGES |
| 611 | new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HPTE_SUB0; |
| 612 | #else |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 613 | new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HASHPTE; |
Benjamin Herrenschmidt | 41743a4 | 2008-06-11 15:37:10 +1000 | [diff] [blame] | 614 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | /* Add in WIMG bits */ |
Dave Kleikamp | 87e9ab1 | 2008-06-19 08:32:56 +1000 | [diff] [blame] | 616 | rflags |= (new_pte & (_PAGE_WRITETHRU | _PAGE_NO_CACHE | |
| 617 | _PAGE_COHERENT | _PAGE_GUARDED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 619 | /* Insert into the hash table, primary slot */ |
| 620 | slot = ppc_md.hpte_insert(hpte_group, va, pa, rflags, 0, |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 621 | mmu_psize, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
| 623 | /* Primary is full, try the secondary */ |
| 624 | if (unlikely(slot == -1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | hpte_group = ((~hash & htab_hash_mask) * |
| 626 | HPTES_PER_GROUP) & ~0x7UL; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 627 | slot = ppc_md.hpte_insert(hpte_group, va, pa, rflags, |
Benjamin Herrenschmidt | 67b1081 | 2005-09-23 13:24:07 -0700 | [diff] [blame] | 628 | HPTE_V_SECONDARY, |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 629 | mmu_psize, ssize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | if (slot == -1) { |
| 631 | if (mftb() & 0x1) |
Benjamin Herrenschmidt | 67b1081 | 2005-09-23 13:24:07 -0700 | [diff] [blame] | 632 | hpte_group = ((hash & htab_hash_mask) * |
| 633 | HPTES_PER_GROUP)&~0x7UL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
| 635 | ppc_md.hpte_remove(hpte_group); |
| 636 | goto repeat; |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | if (unlikely(slot == -2)) |
| 641 | panic("hash_huge_page: pte_insert failed\n"); |
| 642 | |
Ishizaki Kou | d649bd7 | 2007-01-12 09:54:39 +0900 | [diff] [blame] | 643 | new_pte |= (slot << 12) & (_PAGE_F_SECOND | _PAGE_F_GIX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 646 | /* |
Hugh Dickins | 01edcd8 | 2005-11-23 13:37:39 -0800 | [diff] [blame] | 647 | * No need to use ldarx/stdcx here |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 648 | */ |
| 649 | *ptep = __pte(new_pte & ~_PAGE_BUSY); |
| 650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | err = 0; |
| 652 | |
| 653 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | return err; |
| 655 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 656 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 657 | static int __init add_huge_page_size(unsigned long long size) |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 658 | { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 659 | int shift = __ffs(size); |
| 660 | int mmu_psize; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 661 | |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 662 | /* Check that it is a page size supported by the hardware and |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 663 | * that it fits within pagetable and slice limits. */ |
| 664 | if (!is_power_of_2(size) |
| 665 | || (shift > SLICE_HIGH_SHIFT) || (shift <= PAGE_SHIFT)) |
| 666 | return -EINVAL; |
Jon Tollefson | 9122434 | 2008-07-23 21:27:55 -0700 | [diff] [blame] | 667 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 668 | if ((mmu_psize = shift_to_mmu_psize(shift)) < 0) |
| 669 | return -EINVAL; |
| 670 | |
| 671 | #ifdef CONFIG_SPU_FS_64K_LS |
| 672 | /* Disable support for 64K huge pages when 64K SPU local store |
| 673 | * support is enabled as the current implementation conflicts. |
| 674 | */ |
| 675 | if (shift == PAGE_SHIFT_64K) |
| 676 | return -EINVAL; |
| 677 | #endif /* CONFIG_SPU_FS_64K_LS */ |
| 678 | |
| 679 | BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); |
| 680 | |
| 681 | /* Return if huge page size has already been setup */ |
| 682 | if (size_to_hstate(size)) |
| 683 | return 0; |
| 684 | |
| 685 | hugetlb_add_hstate(shift - PAGE_SHIFT); |
| 686 | |
| 687 | return 0; |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | static int __init hugepage_setup_sz(char *str) |
| 691 | { |
| 692 | unsigned long long size; |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 693 | |
| 694 | size = memparse(str, &str); |
| 695 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 696 | if (add_huge_page_size(size) != 0) |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 697 | printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size); |
| 698 | |
| 699 | return 1; |
| 700 | } |
| 701 | __setup("hugepagesz=", hugepage_setup_sz); |
| 702 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 703 | static int __init hugetlbpage_init(void) |
| 704 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 705 | int psize; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 706 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 707 | if (!cpu_has_feature(CPU_FTR_16M_PAGE)) |
| 708 | return -ENODEV; |
Benjamin Herrenschmidt | 00df438 | 2008-07-28 16:13:18 +1000 | [diff] [blame] | 709 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 710 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 711 | unsigned shift; |
| 712 | unsigned pdshift; |
| 713 | |
| 714 | if (!mmu_psize_defs[psize].shift) |
| 715 | continue; |
| 716 | |
| 717 | shift = mmu_psize_to_shift(psize); |
| 718 | |
| 719 | if (add_huge_page_size(1ULL << shift) < 0) |
| 720 | continue; |
| 721 | |
| 722 | if (shift < PMD_SHIFT) |
| 723 | pdshift = PMD_SHIFT; |
| 724 | else if (shift < PUD_SHIFT) |
| 725 | pdshift = PUD_SHIFT; |
| 726 | else |
| 727 | pdshift = PGDIR_SHIFT; |
| 728 | |
| 729 | pgtable_cache_add(pdshift - shift, NULL); |
| 730 | if (!PGT_CACHE(pdshift - shift)) |
| 731 | panic("hugetlbpage_init(): could not create " |
| 732 | "pgtable cache for %d bit pagesize\n", shift); |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 733 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 734 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame^] | 735 | /* Set default large page size. Currently, we pick 16M or 1M |
| 736 | * depending on what is available |
| 737 | */ |
| 738 | if (mmu_psize_defs[MMU_PAGE_16M].shift) |
| 739 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_16M].shift; |
| 740 | else if (mmu_psize_defs[MMU_PAGE_1M].shift) |
| 741 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_1M].shift; |
| 742 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | module_init(hugetlbpage_init); |