Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 2 | * PPC Huge TLB Page Support for Kernel. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2003 David Gibson, IBM Corporation. |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 5 | * Copyright (C) 2011 Becky Bruce, Freescale Semiconductor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * Based on the IA-32 version: |
| 8 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> |
| 9 | */ |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/mm.h> |
David Gibson | 883a3e5 | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 12 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/hugetlb.h> |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 15 | #include <linux/of_fdt.h> |
| 16 | #include <linux/memblock.h> |
| 17 | #include <linux/bootmem.h> |
Kumar Gala | 13020be | 2011-11-24 09:40:07 +0000 | [diff] [blame] | 18 | #include <linux/moduleparam.h> |
David Gibson | 883a3e5 | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 19 | #include <asm/pgtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/pgalloc.h> |
| 21 | #include <asm/tlb.h> |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 22 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Jon Tollefson | 9122434 | 2008-07-23 21:27:55 -0700 | [diff] [blame] | 24 | #define PAGE_SHIFT_64K 16 |
| 25 | #define PAGE_SHIFT_16M 24 |
| 26 | #define PAGE_SHIFT_16G 34 |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 27 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 28 | unsigned int HPAGE_SHIFT; |
| 29 | |
| 30 | /* |
| 31 | * Tracks gpages after the device tree is scanned and before the |
Becky Bruce | a614688 | 2011-10-10 10:50:43 +0000 | [diff] [blame] | 32 | * huge_boot_pages list is ready. On non-Freescale implementations, this is |
| 33 | * just used to track 16G pages and so is a single array. FSL-based |
| 34 | * implementations may have more than one gpage size, so we need multiple |
| 35 | * arrays |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 36 | */ |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 37 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 38 | #define MAX_NUMBER_GPAGES 128 |
| 39 | struct psize_gpages { |
| 40 | u64 gpage_list[MAX_NUMBER_GPAGES]; |
| 41 | unsigned int nr_gpages; |
| 42 | }; |
| 43 | static struct psize_gpages gpage_freearray[MMU_PAGE_COUNT]; |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 44 | #else |
| 45 | #define MAX_NUMBER_GPAGES 1024 |
| 46 | static u64 gpage_freearray[MAX_NUMBER_GPAGES]; |
| 47 | static unsigned nr_gpages; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 48 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 49 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 50 | static inline int shift_to_mmu_psize(unsigned int shift) |
| 51 | { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 52 | int psize; |
| 53 | |
| 54 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) |
| 55 | if (mmu_psize_defs[psize].shift == shift) |
| 56 | return psize; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 57 | return -1; |
| 58 | } |
| 59 | |
| 60 | static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize) |
| 61 | { |
| 62 | if (mmu_psize_defs[mmu_psize].shift) |
| 63 | return mmu_psize_defs[mmu_psize].shift; |
| 64 | BUG(); |
| 65 | } |
| 66 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 67 | #define hugepd_none(hpd) ((hpd).pd == 0) |
| 68 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 69 | 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] | 70 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 71 | pgd_t *pg; |
| 72 | pud_t *pu; |
| 73 | pmd_t *pm; |
| 74 | hugepd_t *hpdp = NULL; |
| 75 | unsigned pdshift = PGDIR_SHIFT; |
| 76 | |
| 77 | if (shift) |
| 78 | *shift = 0; |
| 79 | |
| 80 | pg = pgdir + pgd_index(ea); |
| 81 | if (is_hugepd(pg)) { |
| 82 | hpdp = (hugepd_t *)pg; |
| 83 | } else if (!pgd_none(*pg)) { |
| 84 | pdshift = PUD_SHIFT; |
| 85 | pu = pud_offset(pg, ea); |
| 86 | if (is_hugepd(pu)) |
| 87 | hpdp = (hugepd_t *)pu; |
| 88 | else if (!pud_none(*pu)) { |
| 89 | pdshift = PMD_SHIFT; |
| 90 | pm = pmd_offset(pu, ea); |
| 91 | if (is_hugepd(pm)) |
| 92 | hpdp = (hugepd_t *)pm; |
| 93 | else if (!pmd_none(*pm)) { |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 94 | return pte_offset_kernel(pm, ea); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 95 | } |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | if (!hpdp) |
| 100 | return NULL; |
| 101 | |
| 102 | if (shift) |
| 103 | *shift = hugepd_shift(*hpdp); |
| 104 | return hugepte_offset(hpdp, ea, pdshift); |
| 105 | } |
| 106 | |
| 107 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
| 108 | { |
| 109 | return find_linux_pte_or_hugepte(mm->pgd, addr, NULL); |
| 110 | } |
| 111 | |
| 112 | static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, |
| 113 | unsigned long address, unsigned pdshift, unsigned pshift) |
| 114 | { |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 115 | struct kmem_cache *cachep; |
| 116 | pte_t *new; |
| 117 | |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 118 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 119 | int i; |
| 120 | int num_hugepd = 1 << (pshift - pdshift); |
| 121 | cachep = hugepte_cache; |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 122 | #else |
| 123 | cachep = PGT_CACHE(pdshift - pshift); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 124 | #endif |
| 125 | |
| 126 | new = kmem_cache_zalloc(cachep, GFP_KERNEL|__GFP_REPEAT); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 127 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 128 | BUG_ON(pshift > HUGEPD_SHIFT_MASK); |
| 129 | BUG_ON((unsigned long)new & HUGEPD_SHIFT_MASK); |
| 130 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 131 | if (! new) |
| 132 | return -ENOMEM; |
| 133 | |
| 134 | spin_lock(&mm->page_table_lock); |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 135 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 136 | /* |
| 137 | * We have multiple higher-level entries that point to the same |
| 138 | * actual pte location. Fill in each as we go and backtrack on error. |
| 139 | * We need all of these so the DTLB pgtable walk code can find the |
| 140 | * right higher-level entry without knowing if it's a hugepage or not. |
| 141 | */ |
| 142 | for (i = 0; i < num_hugepd; i++, hpdp++) { |
| 143 | if (unlikely(!hugepd_none(*hpdp))) |
| 144 | break; |
| 145 | else |
| 146 | hpdp->pd = ((unsigned long)new & ~PD_HUGE) | pshift; |
| 147 | } |
| 148 | /* If we bailed from the for loop early, an error occurred, clean up */ |
| 149 | if (i < num_hugepd) { |
| 150 | for (i = i - 1 ; i >= 0; i--, hpdp--) |
| 151 | hpdp->pd = 0; |
| 152 | kmem_cache_free(cachep, new); |
| 153 | } |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 154 | #else |
| 155 | if (!hugepd_none(*hpdp)) |
| 156 | kmem_cache_free(cachep, new); |
| 157 | else |
| 158 | hpdp->pd = ((unsigned long)new & ~PD_HUGE) | pshift; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 159 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 160 | spin_unlock(&mm->page_table_lock); |
| 161 | return 0; |
| 162 | } |
| 163 | |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 164 | /* |
| 165 | * These macros define how to determine which level of the page table holds |
| 166 | * the hpdp. |
| 167 | */ |
| 168 | #ifdef CONFIG_PPC_FSL_BOOK3E |
| 169 | #define HUGEPD_PGD_SHIFT PGDIR_SHIFT |
| 170 | #define HUGEPD_PUD_SHIFT PUD_SHIFT |
| 171 | #else |
| 172 | #define HUGEPD_PGD_SHIFT PUD_SHIFT |
| 173 | #define HUGEPD_PUD_SHIFT PMD_SHIFT |
| 174 | #endif |
| 175 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 176 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) |
| 177 | { |
| 178 | pgd_t *pg; |
| 179 | pud_t *pu; |
| 180 | pmd_t *pm; |
| 181 | hugepd_t *hpdp = NULL; |
| 182 | unsigned pshift = __ffs(sz); |
| 183 | unsigned pdshift = PGDIR_SHIFT; |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 184 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 185 | addr &= ~(sz-1); |
| 186 | |
| 187 | pg = pgd_offset(mm, addr); |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 188 | |
| 189 | if (pshift >= HUGEPD_PGD_SHIFT) { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 190 | hpdp = (hugepd_t *)pg; |
| 191 | } else { |
| 192 | pdshift = PUD_SHIFT; |
| 193 | pu = pud_alloc(mm, pg, addr); |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 194 | if (pshift >= HUGEPD_PUD_SHIFT) { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 195 | hpdp = (hugepd_t *)pu; |
| 196 | } else { |
| 197 | pdshift = PMD_SHIFT; |
| 198 | pm = pmd_alloc(mm, pu, addr); |
| 199 | hpdp = (hugepd_t *)pm; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | if (!hpdp) |
| 204 | return NULL; |
| 205 | |
| 206 | BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp)); |
| 207 | |
| 208 | if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr, pdshift, pshift)) |
| 209 | return NULL; |
| 210 | |
| 211 | return hugepte_offset(hpdp, addr, pdshift); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 212 | } |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 213 | |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 214 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Jon Tollefson | 658013e | 2008-07-23 21:27:54 -0700 | [diff] [blame] | 215 | /* Build list of addresses of gigantic pages. This function is used in early |
| 216 | * boot before the buddy or bootmem allocator is setup. |
| 217 | */ |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 218 | void add_gpage(u64 addr, u64 page_size, unsigned long number_of_pages) |
| 219 | { |
| 220 | unsigned int idx = shift_to_mmu_psize(__ffs(page_size)); |
| 221 | int i; |
| 222 | |
| 223 | if (addr == 0) |
| 224 | return; |
| 225 | |
| 226 | gpage_freearray[idx].nr_gpages = number_of_pages; |
| 227 | |
| 228 | for (i = 0; i < number_of_pages; i++) { |
| 229 | gpage_freearray[idx].gpage_list[i] = addr; |
| 230 | addr += page_size; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Moves the gigantic page addresses from the temporary list to the |
| 236 | * huge_boot_pages list. |
| 237 | */ |
| 238 | int alloc_bootmem_huge_page(struct hstate *hstate) |
| 239 | { |
| 240 | struct huge_bootmem_page *m; |
| 241 | int idx = shift_to_mmu_psize(hstate->order + PAGE_SHIFT); |
| 242 | int nr_gpages = gpage_freearray[idx].nr_gpages; |
| 243 | |
| 244 | if (nr_gpages == 0) |
| 245 | return 0; |
| 246 | |
| 247 | #ifdef CONFIG_HIGHMEM |
| 248 | /* |
| 249 | * If gpages can be in highmem we can't use the trick of storing the |
| 250 | * data structure in the page; allocate space for this |
| 251 | */ |
| 252 | m = alloc_bootmem(sizeof(struct huge_bootmem_page)); |
| 253 | m->phys = gpage_freearray[idx].gpage_list[--nr_gpages]; |
| 254 | #else |
| 255 | m = phys_to_virt(gpage_freearray[idx].gpage_list[--nr_gpages]); |
| 256 | #endif |
| 257 | |
| 258 | list_add(&m->list, &huge_boot_pages); |
| 259 | gpage_freearray[idx].nr_gpages = nr_gpages; |
| 260 | gpage_freearray[idx].gpage_list[nr_gpages] = 0; |
| 261 | m->hstate = hstate; |
| 262 | |
| 263 | return 1; |
| 264 | } |
| 265 | /* |
| 266 | * Scan the command line hugepagesz= options for gigantic pages; store those in |
| 267 | * a list that we use to allocate the memory once all options are parsed. |
| 268 | */ |
| 269 | |
| 270 | unsigned long gpage_npages[MMU_PAGE_COUNT]; |
| 271 | |
| 272 | static int __init do_gpage_early_setup(char *param, char *val) |
| 273 | { |
| 274 | static phys_addr_t size; |
| 275 | unsigned long npages; |
| 276 | |
| 277 | /* |
| 278 | * The hugepagesz and hugepages cmdline options are interleaved. We |
| 279 | * use the size variable to keep track of whether or not this was done |
| 280 | * properly and skip over instances where it is incorrect. Other |
| 281 | * command-line parsing code will issue warnings, so we don't need to. |
| 282 | * |
| 283 | */ |
| 284 | if ((strcmp(param, "default_hugepagesz") == 0) || |
| 285 | (strcmp(param, "hugepagesz") == 0)) { |
| 286 | size = memparse(val, NULL); |
| 287 | } else if (strcmp(param, "hugepages") == 0) { |
| 288 | if (size != 0) { |
| 289 | if (sscanf(val, "%lu", &npages) <= 0) |
| 290 | npages = 0; |
| 291 | gpage_npages[shift_to_mmu_psize(__ffs(size))] = npages; |
| 292 | size = 0; |
| 293 | } |
| 294 | } |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | |
| 299 | /* |
| 300 | * This function allocates physical space for pages that are larger than the |
| 301 | * buddy allocator can handle. We want to allocate these in highmem because |
| 302 | * the amount of lowmem is limited. This means that this function MUST be |
| 303 | * called before lowmem_end_addr is set up in MMU_init() in order for the lmb |
| 304 | * allocate to grab highmem. |
| 305 | */ |
| 306 | void __init reserve_hugetlb_gpages(void) |
| 307 | { |
| 308 | static __initdata char cmdline[COMMAND_LINE_SIZE]; |
| 309 | phys_addr_t size, base; |
| 310 | int i; |
| 311 | |
| 312 | strlcpy(cmdline, boot_command_line, COMMAND_LINE_SIZE); |
| 313 | parse_args("hugetlb gpages", cmdline, NULL, 0, &do_gpage_early_setup); |
| 314 | |
| 315 | /* |
| 316 | * Walk gpage list in reverse, allocating larger page sizes first. |
| 317 | * Skip over unsupported sizes, or sizes that have 0 gpages allocated. |
| 318 | * When we reach the point in the list where pages are no longer |
| 319 | * considered gpages, we're done. |
| 320 | */ |
| 321 | for (i = MMU_PAGE_COUNT-1; i >= 0; i--) { |
| 322 | if (mmu_psize_defs[i].shift == 0 || gpage_npages[i] == 0) |
| 323 | continue; |
| 324 | else if (mmu_psize_to_shift(i) < (MAX_ORDER + PAGE_SHIFT)) |
| 325 | break; |
| 326 | |
| 327 | size = (phys_addr_t)(1ULL << mmu_psize_to_shift(i)); |
| 328 | base = memblock_alloc_base(size * gpage_npages[i], size, |
| 329 | MEMBLOCK_ALLOC_ANYWHERE); |
| 330 | add_gpage(base, size, gpage_npages[i]); |
| 331 | } |
| 332 | } |
| 333 | |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 334 | #else /* !PPC_FSL_BOOK3E */ |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 335 | |
| 336 | /* Build list of addresses of gigantic pages. This function is used in early |
| 337 | * boot before the buddy or bootmem allocator is setup. |
| 338 | */ |
| 339 | void add_gpage(u64 addr, u64 page_size, unsigned long number_of_pages) |
Jon Tollefson | 658013e | 2008-07-23 21:27:54 -0700 | [diff] [blame] | 340 | { |
| 341 | if (!addr) |
| 342 | return; |
| 343 | while (number_of_pages > 0) { |
| 344 | gpage_freearray[nr_gpages] = addr; |
| 345 | nr_gpages++; |
| 346 | number_of_pages--; |
| 347 | addr += page_size; |
| 348 | } |
| 349 | } |
| 350 | |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 351 | /* Moves the gigantic page addresses from the temporary list to the |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 352 | * huge_boot_pages list. |
| 353 | */ |
| 354 | int alloc_bootmem_huge_page(struct hstate *hstate) |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 355 | { |
| 356 | struct huge_bootmem_page *m; |
| 357 | if (nr_gpages == 0) |
| 358 | return 0; |
| 359 | m = phys_to_virt(gpage_freearray[--nr_gpages]); |
| 360 | gpage_freearray[nr_gpages] = 0; |
| 361 | list_add(&m->list, &huge_boot_pages); |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 362 | m->hstate = hstate; |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 363 | return 1; |
| 364 | } |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 365 | #endif |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 366 | |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 367 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
| 368 | { |
| 369 | return 0; |
| 370 | } |
| 371 | |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 372 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 373 | #define HUGEPD_FREELIST_SIZE \ |
| 374 | ((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t)) |
| 375 | |
| 376 | struct hugepd_freelist { |
| 377 | struct rcu_head rcu; |
| 378 | unsigned int index; |
| 379 | void *ptes[0]; |
| 380 | }; |
| 381 | |
| 382 | static DEFINE_PER_CPU(struct hugepd_freelist *, hugepd_freelist_cur); |
| 383 | |
| 384 | static void hugepd_free_rcu_callback(struct rcu_head *head) |
| 385 | { |
| 386 | struct hugepd_freelist *batch = |
| 387 | container_of(head, struct hugepd_freelist, rcu); |
| 388 | unsigned int i; |
| 389 | |
| 390 | for (i = 0; i < batch->index; i++) |
| 391 | kmem_cache_free(hugepte_cache, batch->ptes[i]); |
| 392 | |
| 393 | free_page((unsigned long)batch); |
| 394 | } |
| 395 | |
| 396 | static void hugepd_free(struct mmu_gather *tlb, void *hugepte) |
| 397 | { |
| 398 | struct hugepd_freelist **batchp; |
| 399 | |
| 400 | batchp = &__get_cpu_var(hugepd_freelist_cur); |
| 401 | |
| 402 | if (atomic_read(&tlb->mm->mm_users) < 2 || |
| 403 | cpumask_equal(mm_cpumask(tlb->mm), |
| 404 | cpumask_of(smp_processor_id()))) { |
| 405 | kmem_cache_free(hugepte_cache, hugepte); |
| 406 | return; |
| 407 | } |
| 408 | |
| 409 | if (*batchp == NULL) { |
| 410 | *batchp = (struct hugepd_freelist *)__get_free_page(GFP_ATOMIC); |
| 411 | (*batchp)->index = 0; |
| 412 | } |
| 413 | |
| 414 | (*batchp)->ptes[(*batchp)->index++] = hugepte; |
| 415 | if ((*batchp)->index == HUGEPD_FREELIST_SIZE) { |
| 416 | call_rcu_sched(&(*batchp)->rcu, hugepd_free_rcu_callback); |
| 417 | *batchp = NULL; |
| 418 | } |
| 419 | } |
| 420 | #endif |
| 421 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 422 | static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshift, |
| 423 | unsigned long start, unsigned long end, |
| 424 | unsigned long floor, unsigned long ceiling) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 425 | { |
| 426 | pte_t *hugepte = hugepd_page(*hpdp); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 427 | int i; |
| 428 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 429 | unsigned long pdmask = ~((1UL << pdshift) - 1); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 430 | unsigned int num_hugepd = 1; |
| 431 | |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 432 | #ifdef CONFIG_PPC_FSL_BOOK3E |
| 433 | /* Note: On fsl the hpdp may be the first of several */ |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 434 | num_hugepd = (1 << (hugepd_shift(*hpdp) - pdshift)); |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 435 | #else |
| 436 | unsigned int shift = hugepd_shift(*hpdp); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 437 | #endif |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 438 | |
| 439 | start &= pdmask; |
| 440 | if (start < floor) |
| 441 | return; |
| 442 | if (ceiling) { |
| 443 | ceiling &= pdmask; |
| 444 | if (! ceiling) |
| 445 | return; |
| 446 | } |
| 447 | if (end - 1 > ceiling - 1) |
| 448 | return; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 449 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 450 | for (i = 0; i < num_hugepd; i++, hpdp++) |
| 451 | hpdp->pd = 0; |
| 452 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 453 | tlb->need_flush = 1; |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 454 | |
| 455 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 456 | hugepd_free(tlb, hugepte); |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 457 | #else |
| 458 | pgtable_free_tlb(tlb, hugepte, pdshift - shift); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 459 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 460 | } |
| 461 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 462 | static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, |
| 463 | unsigned long addr, unsigned long end, |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 464 | unsigned long floor, unsigned long ceiling) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 465 | { |
| 466 | pmd_t *pmd; |
| 467 | unsigned long next; |
| 468 | unsigned long start; |
| 469 | |
| 470 | start = addr; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 471 | do { |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 472 | pmd = pmd_offset(pud, addr); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 473 | next = pmd_addr_end(addr, end); |
| 474 | if (pmd_none(*pmd)) |
| 475 | continue; |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 476 | #ifdef CONFIG_PPC_FSL_BOOK3E |
| 477 | /* |
| 478 | * Increment next by the size of the huge mapping since |
| 479 | * there may be more than one entry at this level for a |
| 480 | * single hugepage, but all of them point to |
| 481 | * the same kmem cache that holds the hugepte. |
| 482 | */ |
| 483 | next = addr + (1 << hugepd_shift(*(hugepd_t *)pmd)); |
| 484 | #endif |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 485 | free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT, |
| 486 | addr, next, floor, ceiling); |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 487 | } while (addr = next, addr != end); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 488 | |
| 489 | start &= PUD_MASK; |
| 490 | if (start < floor) |
| 491 | return; |
| 492 | if (ceiling) { |
| 493 | ceiling &= PUD_MASK; |
| 494 | if (!ceiling) |
| 495 | return; |
| 496 | } |
| 497 | if (end - 1 > ceiling - 1) |
| 498 | return; |
| 499 | |
| 500 | pmd = pmd_offset(pud, start); |
| 501 | pud_clear(pud); |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 502 | pmd_free_tlb(tlb, pmd, start); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 503 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 504 | |
| 505 | static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, |
| 506 | unsigned long addr, unsigned long end, |
| 507 | unsigned long floor, unsigned long ceiling) |
| 508 | { |
| 509 | pud_t *pud; |
| 510 | unsigned long next; |
| 511 | unsigned long start; |
| 512 | |
| 513 | start = addr; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 514 | do { |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 515 | pud = pud_offset(pgd, addr); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 516 | next = pud_addr_end(addr, end); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 517 | if (!is_hugepd(pud)) { |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 518 | if (pud_none_or_clear_bad(pud)) |
| 519 | continue; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 520 | hugetlb_free_pmd_range(tlb, pud, addr, next, floor, |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 521 | ceiling); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 522 | } else { |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 523 | #ifdef CONFIG_PPC_FSL_BOOK3E |
| 524 | /* |
| 525 | * Increment next by the size of the huge mapping since |
| 526 | * there may be more than one entry at this level for a |
| 527 | * single hugepage, but all of them point to |
| 528 | * the same kmem cache that holds the hugepte. |
| 529 | */ |
| 530 | next = addr + (1 << hugepd_shift(*(hugepd_t *)pud)); |
| 531 | #endif |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 532 | free_hugepd_range(tlb, (hugepd_t *)pud, PUD_SHIFT, |
| 533 | addr, next, floor, ceiling); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 534 | } |
Becky Bruce | a1cd541 | 2011-10-10 10:50:39 +0000 | [diff] [blame] | 535 | } while (addr = next, addr != end); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 536 | |
| 537 | start &= PGDIR_MASK; |
| 538 | if (start < floor) |
| 539 | return; |
| 540 | if (ceiling) { |
| 541 | ceiling &= PGDIR_MASK; |
| 542 | if (!ceiling) |
| 543 | return; |
| 544 | } |
| 545 | if (end - 1 > ceiling - 1) |
| 546 | return; |
| 547 | |
| 548 | pud = pud_offset(pgd, start); |
| 549 | pgd_clear(pgd); |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 550 | pud_free_tlb(tlb, pud, start); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | /* |
| 554 | * This function frees user-level page tables of a process. |
| 555 | * |
| 556 | * Must be called with pagetable lock held. |
| 557 | */ |
Jan Beulich | 42b7772 | 2008-07-23 21:27:10 -0700 | [diff] [blame] | 558 | void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 559 | unsigned long addr, unsigned long end, |
| 560 | unsigned long floor, unsigned long ceiling) |
| 561 | { |
| 562 | pgd_t *pgd; |
| 563 | unsigned long next; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 564 | |
| 565 | /* |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 566 | * Because there are a number of different possible pagetable |
| 567 | * layouts for hugepage ranges, we limit knowledge of how |
| 568 | * things should be laid out to the allocation path |
| 569 | * (huge_pte_alloc(), above). Everything else works out the |
| 570 | * structure as it goes from information in the hugepd |
| 571 | * pointers. That means that we can't here use the |
| 572 | * optimization used in the normal page free_pgd_range(), of |
| 573 | * checking whether we're actually covering a large enough |
| 574 | * range to have to do anything at the top level of the walk |
| 575 | * instead of at the bottom. |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 576 | * |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 577 | * To make sense of this, you should probably go read the big |
| 578 | * block comment at the top of the normal free_pgd_range(), |
| 579 | * too. |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 580 | */ |
| 581 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 582 | do { |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 583 | next = pgd_addr_end(addr, end); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 584 | pgd = pgd_offset(tlb->mm, addr); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 585 | if (!is_hugepd(pgd)) { |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 586 | if (pgd_none_or_clear_bad(pgd)) |
| 587 | continue; |
| 588 | hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling); |
| 589 | } else { |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 590 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 591 | /* |
| 592 | * Increment next by the size of the huge mapping since |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 593 | * there may be more than one entry at the pgd level |
| 594 | * for a single hugepage, but all of them point to the |
| 595 | * same kmem cache that holds the hugepte. |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 596 | */ |
| 597 | next = addr + (1 << hugepd_shift(*(hugepd_t *)pgd)); |
| 598 | #endif |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 599 | free_hugepd_range(tlb, (hugepd_t *)pgd, PGDIR_SHIFT, |
| 600 | addr, next, floor, ceiling); |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 601 | } |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 602 | } while (addr = next, addr != end); |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 603 | } |
| 604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | struct page * |
| 606 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) |
| 607 | { |
| 608 | pte_t *ptep; |
| 609 | struct page *page; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 610 | unsigned shift; |
| 611 | unsigned long mask; |
| 612 | |
| 613 | ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 615 | /* Verify it is a huge page else bail. */ |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 616 | if (!ptep || !shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | return ERR_PTR(-EINVAL); |
| 618 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 619 | mask = (1UL << shift) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | page = pte_page(*ptep); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 621 | if (page) |
| 622 | page += (address & mask) / PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
| 624 | return page; |
| 625 | } |
| 626 | |
| 627 | int pmd_huge(pmd_t pmd) |
| 628 | { |
| 629 | return 0; |
| 630 | } |
| 631 | |
Andi Kleen | ceb8687 | 2008-07-23 21:27:50 -0700 | [diff] [blame] | 632 | int pud_huge(pud_t pud) |
| 633 | { |
| 634 | return 0; |
| 635 | } |
| 636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | struct page * |
| 638 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, |
| 639 | pmd_t *pmd, int write) |
| 640 | { |
| 641 | BUG(); |
| 642 | return NULL; |
| 643 | } |
| 644 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 645 | static noinline int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, |
| 646 | unsigned long end, int write, struct page **pages, int *nr) |
| 647 | { |
| 648 | unsigned long mask; |
| 649 | unsigned long pte_end; |
Andrea Arcangeli | 3526741 | 2011-11-02 13:37:15 -0700 | [diff] [blame] | 650 | struct page *head, *page, *tail; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 651 | pte_t pte; |
| 652 | int refs; |
| 653 | |
| 654 | pte_end = (addr + sz) & ~(sz-1); |
| 655 | if (pte_end < end) |
| 656 | end = pte_end; |
| 657 | |
| 658 | pte = *ptep; |
| 659 | mask = _PAGE_PRESENT | _PAGE_USER; |
| 660 | if (write) |
| 661 | mask |= _PAGE_RW; |
| 662 | |
| 663 | if ((pte_val(pte) & mask) != mask) |
| 664 | return 0; |
| 665 | |
| 666 | /* hugepages are never "special" */ |
| 667 | VM_BUG_ON(!pfn_valid(pte_pfn(pte))); |
| 668 | |
| 669 | refs = 0; |
| 670 | head = pte_page(pte); |
| 671 | |
| 672 | page = head + ((addr & (sz-1)) >> PAGE_SHIFT); |
Andrea Arcangeli | 3526741 | 2011-11-02 13:37:15 -0700 | [diff] [blame] | 673 | tail = page; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 674 | do { |
| 675 | VM_BUG_ON(compound_head(page) != head); |
| 676 | pages[*nr] = page; |
| 677 | (*nr)++; |
| 678 | page++; |
| 679 | refs++; |
| 680 | } while (addr += PAGE_SIZE, addr != end); |
| 681 | |
| 682 | if (!page_cache_add_speculative(head, refs)) { |
| 683 | *nr -= refs; |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | if (unlikely(pte_val(pte) != pte_val(*ptep))) { |
| 688 | /* Could be optimized better */ |
Andrea Arcangeli | 8596468 | 2011-11-02 13:37:11 -0700 | [diff] [blame] | 689 | *nr -= refs; |
| 690 | while (refs--) |
Andrea Arcangeli | 405e44f | 2011-11-02 13:37:08 -0700 | [diff] [blame] | 691 | put_page(head); |
Andrea Arcangeli | cf592bf | 2011-11-02 13:37:19 -0700 | [diff] [blame] | 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | /* |
| 696 | * Any tail page need their mapcount reference taken before we |
| 697 | * return. |
| 698 | */ |
| 699 | while (refs--) { |
| 700 | if (PageTail(tail)) |
| 701 | get_huge_page_tail(tail); |
| 702 | tail++; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | return 1; |
| 706 | } |
| 707 | |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 708 | static unsigned long hugepte_addr_end(unsigned long addr, unsigned long end, |
| 709 | unsigned long sz) |
| 710 | { |
| 711 | unsigned long __boundary = (addr + sz) & ~(sz-1); |
| 712 | return (__boundary - 1 < end - 1) ? __boundary : end; |
| 713 | } |
| 714 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 715 | int gup_hugepd(hugepd_t *hugepd, unsigned pdshift, |
| 716 | unsigned long addr, unsigned long end, |
| 717 | int write, struct page **pages, int *nr) |
| 718 | { |
| 719 | pte_t *ptep; |
| 720 | unsigned long sz = 1UL << hugepd_shift(*hugepd); |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 721 | unsigned long next; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 722 | |
| 723 | ptep = hugepte_offset(hugepd, addr, pdshift); |
| 724 | do { |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 725 | next = hugepte_addr_end(addr, end, sz); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 726 | if (!gup_hugepte(ptep, sz, addr, end, write, pages, nr)) |
| 727 | return 0; |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 728 | } while (ptep++, addr = next, addr != end); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 729 | |
| 730 | return 1; |
| 731 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Becky Bruce | 7651295 | 2011-10-10 10:50:36 +0000 | [diff] [blame] | 733 | #ifdef CONFIG_PPC_MM_SLICES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
| 735 | unsigned long len, unsigned long pgoff, |
| 736 | unsigned long flags) |
| 737 | { |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 738 | struct hstate *hstate = hstate_file(file); |
| 739 | int mmu_psize = shift_to_mmu_psize(huge_page_shift(hstate)); |
Brian King | 48f797d | 2008-12-04 04:07:54 +0000 | [diff] [blame] | 740 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 741 | return slice_get_unmapped_area(addr, len, flags, mmu_psize, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
Becky Bruce | 7651295 | 2011-10-10 10:50:36 +0000 | [diff] [blame] | 743 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 745 | unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) |
| 746 | { |
Paul Mackerras | 25c29f9 | 2011-09-20 19:58:10 +0000 | [diff] [blame] | 747 | #ifdef CONFIG_PPC_MM_SLICES |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 748 | unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start); |
| 749 | |
| 750 | return 1UL << mmu_psize_to_shift(psize); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 751 | #else |
| 752 | if (!is_vm_hugetlb_page(vma)) |
| 753 | return PAGE_SIZE; |
| 754 | |
| 755 | return huge_page_size(hstate_vma(vma)); |
| 756 | #endif |
| 757 | } |
| 758 | |
| 759 | static inline bool is_power_of_4(unsigned long x) |
| 760 | { |
| 761 | if (is_power_of_2(x)) |
| 762 | return (__ilog2(x) % 2) ? false : true; |
| 763 | return false; |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 764 | } |
| 765 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 766 | static int __init add_huge_page_size(unsigned long long size) |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 767 | { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 768 | int shift = __ffs(size); |
| 769 | int mmu_psize; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 770 | |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 771 | /* Check that it is a page size supported by the hardware and |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 772 | * that it fits within pagetable and slice limits. */ |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 773 | #ifdef CONFIG_PPC_FSL_BOOK3E |
| 774 | if ((size < PAGE_SIZE) || !is_power_of_4(size)) |
| 775 | return -EINVAL; |
| 776 | #else |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 777 | if (!is_power_of_2(size) |
| 778 | || (shift > SLICE_HIGH_SHIFT) || (shift <= PAGE_SHIFT)) |
| 779 | return -EINVAL; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 780 | #endif |
Jon Tollefson | 9122434 | 2008-07-23 21:27:55 -0700 | [diff] [blame] | 781 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 782 | if ((mmu_psize = shift_to_mmu_psize(shift)) < 0) |
| 783 | return -EINVAL; |
| 784 | |
| 785 | #ifdef CONFIG_SPU_FS_64K_LS |
| 786 | /* Disable support for 64K huge pages when 64K SPU local store |
| 787 | * support is enabled as the current implementation conflicts. |
| 788 | */ |
| 789 | if (shift == PAGE_SHIFT_64K) |
| 790 | return -EINVAL; |
| 791 | #endif /* CONFIG_SPU_FS_64K_LS */ |
| 792 | |
| 793 | BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); |
| 794 | |
| 795 | /* Return if huge page size has already been setup */ |
| 796 | if (size_to_hstate(size)) |
| 797 | return 0; |
| 798 | |
| 799 | hugetlb_add_hstate(shift - PAGE_SHIFT); |
| 800 | |
| 801 | return 0; |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | static int __init hugepage_setup_sz(char *str) |
| 805 | { |
| 806 | unsigned long long size; |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 807 | |
| 808 | size = memparse(str, &str); |
| 809 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 810 | if (add_huge_page_size(size) != 0) |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 811 | printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size); |
| 812 | |
| 813 | return 1; |
| 814 | } |
| 815 | __setup("hugepagesz=", hugepage_setup_sz); |
| 816 | |
Becky Bruce | 881fde1 | 2011-10-10 10:50:40 +0000 | [diff] [blame] | 817 | #ifdef CONFIG_PPC_FSL_BOOK3E |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 818 | struct kmem_cache *hugepte_cache; |
| 819 | static int __init hugetlbpage_init(void) |
| 820 | { |
| 821 | int psize; |
| 822 | |
| 823 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { |
| 824 | unsigned shift; |
| 825 | |
| 826 | if (!mmu_psize_defs[psize].shift) |
| 827 | continue; |
| 828 | |
| 829 | shift = mmu_psize_to_shift(psize); |
| 830 | |
| 831 | /* Don't treat normal page sizes as huge... */ |
| 832 | if (shift != PAGE_SHIFT) |
| 833 | if (add_huge_page_size(1ULL << shift) < 0) |
| 834 | continue; |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Create a kmem cache for hugeptes. The bottom bits in the pte have |
| 839 | * size information encoded in them, so align them to allow this |
| 840 | */ |
| 841 | hugepte_cache = kmem_cache_create("hugepte-cache", sizeof(pte_t), |
| 842 | HUGEPD_SHIFT_MASK + 1, 0, NULL); |
| 843 | if (hugepte_cache == NULL) |
| 844 | panic("%s: Unable to create kmem cache for hugeptes\n", |
| 845 | __func__); |
| 846 | |
| 847 | /* Default hpage size = 4M */ |
| 848 | if (mmu_psize_defs[MMU_PAGE_4M].shift) |
| 849 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_4M].shift; |
| 850 | else |
| 851 | panic("%s: Unable to set default huge page size\n", __func__); |
| 852 | |
| 853 | |
| 854 | return 0; |
| 855 | } |
| 856 | #else |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 857 | static int __init hugetlbpage_init(void) |
| 858 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 859 | int psize; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 860 | |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 861 | if (!mmu_has_feature(MMU_FTR_16M_PAGE)) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 862 | return -ENODEV; |
Benjamin Herrenschmidt | 00df438 | 2008-07-28 16:13:18 +1000 | [diff] [blame] | 863 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 864 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 865 | unsigned shift; |
| 866 | unsigned pdshift; |
| 867 | |
| 868 | if (!mmu_psize_defs[psize].shift) |
| 869 | continue; |
| 870 | |
| 871 | shift = mmu_psize_to_shift(psize); |
| 872 | |
| 873 | if (add_huge_page_size(1ULL << shift) < 0) |
| 874 | continue; |
| 875 | |
| 876 | if (shift < PMD_SHIFT) |
| 877 | pdshift = PMD_SHIFT; |
| 878 | else if (shift < PUD_SHIFT) |
| 879 | pdshift = PUD_SHIFT; |
| 880 | else |
| 881 | pdshift = PGDIR_SHIFT; |
| 882 | |
| 883 | pgtable_cache_add(pdshift - shift, NULL); |
| 884 | if (!PGT_CACHE(pdshift - shift)) |
| 885 | panic("hugetlbpage_init(): could not create " |
| 886 | "pgtable cache for %d bit pagesize\n", shift); |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 887 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 888 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 889 | /* Set default large page size. Currently, we pick 16M or 1M |
| 890 | * depending on what is available |
| 891 | */ |
| 892 | if (mmu_psize_defs[MMU_PAGE_16M].shift) |
| 893 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_16M].shift; |
| 894 | else if (mmu_psize_defs[MMU_PAGE_1M].shift) |
| 895 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_1M].shift; |
| 896 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 897 | return 0; |
| 898 | } |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 899 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 900 | module_init(hugetlbpage_init); |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 901 | |
| 902 | void flush_dcache_icache_hugepage(struct page *page) |
| 903 | { |
| 904 | int i; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 905 | void *start; |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 906 | |
| 907 | BUG_ON(!PageCompound(page)); |
| 908 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 909 | for (i = 0; i < (1UL << compound_order(page)); i++) { |
| 910 | if (!PageHighMem(page)) { |
| 911 | __flush_dcache_icache(page_address(page+i)); |
| 912 | } else { |
Cong Wang | 2480b20 | 2011-11-25 23:14:16 +0800 | [diff] [blame^] | 913 | start = kmap_atomic(page+i); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 914 | __flush_dcache_icache(start); |
Cong Wang | 2480b20 | 2011-11-25 23:14:16 +0800 | [diff] [blame^] | 915 | kunmap_atomic(start); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 916 | } |
| 917 | } |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 918 | } |