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> |
David Gibson | 883a3e5 | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 18 | #include <asm/pgtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <asm/pgalloc.h> |
| 20 | #include <asm/tlb.h> |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 21 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Jon Tollefson | 9122434 | 2008-07-23 21:27:55 -0700 | [diff] [blame] | 23 | #define PAGE_SHIFT_64K 16 |
| 24 | #define PAGE_SHIFT_16M 24 |
| 25 | #define PAGE_SHIFT_16G 34 |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 26 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 27 | unsigned int HPAGE_SHIFT; |
| 28 | |
| 29 | /* |
| 30 | * Tracks gpages after the device tree is scanned and before the |
| 31 | * huge_boot_pages list is ready. On 64-bit implementations, this is |
| 32 | * just used to track 16G pages and so is a single array. 32-bit |
| 33 | * implementations may have more than one gpage size due to limitations |
| 34 | * of the memory allocators, so we need multiple arrays |
| 35 | */ |
| 36 | #ifdef CONFIG_PPC64 |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 37 | #define MAX_NUMBER_GPAGES 1024 |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 38 | static u64 gpage_freearray[MAX_NUMBER_GPAGES]; |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 39 | static unsigned nr_gpages; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 40 | #else |
| 41 | #define MAX_NUMBER_GPAGES 128 |
| 42 | struct psize_gpages { |
| 43 | u64 gpage_list[MAX_NUMBER_GPAGES]; |
| 44 | unsigned int nr_gpages; |
| 45 | }; |
| 46 | static struct psize_gpages gpage_freearray[MMU_PAGE_COUNT]; |
| 47 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 48 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 49 | static inline int shift_to_mmu_psize(unsigned int shift) |
| 50 | { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 51 | int psize; |
| 52 | |
| 53 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) |
| 54 | if (mmu_psize_defs[psize].shift == shift) |
| 55 | return psize; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 56 | return -1; |
| 57 | } |
| 58 | |
| 59 | static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize) |
| 60 | { |
| 61 | if (mmu_psize_defs[mmu_psize].shift) |
| 62 | return mmu_psize_defs[mmu_psize].shift; |
| 63 | BUG(); |
| 64 | } |
| 65 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 66 | #define hugepd_none(hpd) ((hpd).pd == 0) |
| 67 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 68 | 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] | 69 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 70 | pgd_t *pg; |
| 71 | pud_t *pu; |
| 72 | pmd_t *pm; |
| 73 | hugepd_t *hpdp = NULL; |
| 74 | unsigned pdshift = PGDIR_SHIFT; |
| 75 | |
| 76 | if (shift) |
| 77 | *shift = 0; |
| 78 | |
| 79 | pg = pgdir + pgd_index(ea); |
| 80 | if (is_hugepd(pg)) { |
| 81 | hpdp = (hugepd_t *)pg; |
| 82 | } else if (!pgd_none(*pg)) { |
| 83 | pdshift = PUD_SHIFT; |
| 84 | pu = pud_offset(pg, ea); |
| 85 | if (is_hugepd(pu)) |
| 86 | hpdp = (hugepd_t *)pu; |
| 87 | else if (!pud_none(*pu)) { |
| 88 | pdshift = PMD_SHIFT; |
| 89 | pm = pmd_offset(pu, ea); |
| 90 | if (is_hugepd(pm)) |
| 91 | hpdp = (hugepd_t *)pm; |
| 92 | else if (!pmd_none(*pm)) { |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 93 | return pte_offset_kernel(pm, ea); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | if (!hpdp) |
| 99 | return NULL; |
| 100 | |
| 101 | if (shift) |
| 102 | *shift = hugepd_shift(*hpdp); |
| 103 | return hugepte_offset(hpdp, ea, pdshift); |
| 104 | } |
| 105 | |
| 106 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
| 107 | { |
| 108 | return find_linux_pte_or_hugepte(mm->pgd, addr, NULL); |
| 109 | } |
| 110 | |
| 111 | static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, |
| 112 | unsigned long address, unsigned pdshift, unsigned pshift) |
| 113 | { |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 114 | struct kmem_cache *cachep; |
| 115 | pte_t *new; |
| 116 | |
| 117 | #ifdef CONFIG_PPC64 |
| 118 | cachep = PGT_CACHE(pdshift - pshift); |
| 119 | #else |
| 120 | int i; |
| 121 | int num_hugepd = 1 << (pshift - pdshift); |
| 122 | cachep = hugepte_cache; |
| 123 | #endif |
| 124 | |
| 125 | new = kmem_cache_zalloc(cachep, GFP_KERNEL|__GFP_REPEAT); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 126 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 127 | BUG_ON(pshift > HUGEPD_SHIFT_MASK); |
| 128 | BUG_ON((unsigned long)new & HUGEPD_SHIFT_MASK); |
| 129 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 130 | if (! new) |
| 131 | return -ENOMEM; |
| 132 | |
| 133 | spin_lock(&mm->page_table_lock); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 134 | #ifdef CONFIG_PPC64 |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 135 | if (!hugepd_none(*hpdp)) |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 136 | kmem_cache_free(cachep, new); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 137 | else |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 138 | hpdp->pd = ((unsigned long)new & ~PD_HUGE) | pshift; |
| 139 | #else |
| 140 | /* |
| 141 | * We have multiple higher-level entries that point to the same |
| 142 | * actual pte location. Fill in each as we go and backtrack on error. |
| 143 | * We need all of these so the DTLB pgtable walk code can find the |
| 144 | * right higher-level entry without knowing if it's a hugepage or not. |
| 145 | */ |
| 146 | for (i = 0; i < num_hugepd; i++, hpdp++) { |
| 147 | if (unlikely(!hugepd_none(*hpdp))) |
| 148 | break; |
| 149 | else |
| 150 | hpdp->pd = ((unsigned long)new & ~PD_HUGE) | pshift; |
| 151 | } |
| 152 | /* If we bailed from the for loop early, an error occurred, clean up */ |
| 153 | if (i < num_hugepd) { |
| 154 | for (i = i - 1 ; i >= 0; i--, hpdp--) |
| 155 | hpdp->pd = 0; |
| 156 | kmem_cache_free(cachep, new); |
| 157 | } |
| 158 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 159 | spin_unlock(&mm->page_table_lock); |
| 160 | return 0; |
| 161 | } |
| 162 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 163 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) |
| 164 | { |
| 165 | pgd_t *pg; |
| 166 | pud_t *pu; |
| 167 | pmd_t *pm; |
| 168 | hugepd_t *hpdp = NULL; |
| 169 | unsigned pshift = __ffs(sz); |
| 170 | unsigned pdshift = PGDIR_SHIFT; |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 171 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 172 | addr &= ~(sz-1); |
| 173 | |
| 174 | pg = pgd_offset(mm, addr); |
| 175 | if (pshift >= PUD_SHIFT) { |
| 176 | hpdp = (hugepd_t *)pg; |
| 177 | } else { |
| 178 | pdshift = PUD_SHIFT; |
| 179 | pu = pud_alloc(mm, pg, addr); |
| 180 | if (pshift >= PMD_SHIFT) { |
| 181 | hpdp = (hugepd_t *)pu; |
| 182 | } else { |
| 183 | pdshift = PMD_SHIFT; |
| 184 | pm = pmd_alloc(mm, pu, addr); |
| 185 | hpdp = (hugepd_t *)pm; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | if (!hpdp) |
| 190 | return NULL; |
| 191 | |
| 192 | BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp)); |
| 193 | |
| 194 | if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr, pdshift, pshift)) |
| 195 | return NULL; |
| 196 | |
| 197 | return hugepte_offset(hpdp, addr, pdshift); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 198 | } |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 199 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 200 | #ifdef CONFIG_PPC32 |
Jon Tollefson | 658013e | 2008-07-23 21:27:54 -0700 | [diff] [blame] | 201 | /* Build list of addresses of gigantic pages. This function is used in early |
| 202 | * boot before the buddy or bootmem allocator is setup. |
| 203 | */ |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 204 | void add_gpage(u64 addr, u64 page_size, unsigned long number_of_pages) |
| 205 | { |
| 206 | unsigned int idx = shift_to_mmu_psize(__ffs(page_size)); |
| 207 | int i; |
| 208 | |
| 209 | if (addr == 0) |
| 210 | return; |
| 211 | |
| 212 | gpage_freearray[idx].nr_gpages = number_of_pages; |
| 213 | |
| 214 | for (i = 0; i < number_of_pages; i++) { |
| 215 | gpage_freearray[idx].gpage_list[i] = addr; |
| 216 | addr += page_size; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Moves the gigantic page addresses from the temporary list to the |
| 222 | * huge_boot_pages list. |
| 223 | */ |
| 224 | int alloc_bootmem_huge_page(struct hstate *hstate) |
| 225 | { |
| 226 | struct huge_bootmem_page *m; |
| 227 | int idx = shift_to_mmu_psize(hstate->order + PAGE_SHIFT); |
| 228 | int nr_gpages = gpage_freearray[idx].nr_gpages; |
| 229 | |
| 230 | if (nr_gpages == 0) |
| 231 | return 0; |
| 232 | |
| 233 | #ifdef CONFIG_HIGHMEM |
| 234 | /* |
| 235 | * If gpages can be in highmem we can't use the trick of storing the |
| 236 | * data structure in the page; allocate space for this |
| 237 | */ |
| 238 | m = alloc_bootmem(sizeof(struct huge_bootmem_page)); |
| 239 | m->phys = gpage_freearray[idx].gpage_list[--nr_gpages]; |
| 240 | #else |
| 241 | m = phys_to_virt(gpage_freearray[idx].gpage_list[--nr_gpages]); |
| 242 | #endif |
| 243 | |
| 244 | list_add(&m->list, &huge_boot_pages); |
| 245 | gpage_freearray[idx].nr_gpages = nr_gpages; |
| 246 | gpage_freearray[idx].gpage_list[nr_gpages] = 0; |
| 247 | m->hstate = hstate; |
| 248 | |
| 249 | return 1; |
| 250 | } |
| 251 | /* |
| 252 | * Scan the command line hugepagesz= options for gigantic pages; store those in |
| 253 | * a list that we use to allocate the memory once all options are parsed. |
| 254 | */ |
| 255 | |
| 256 | unsigned long gpage_npages[MMU_PAGE_COUNT]; |
| 257 | |
| 258 | static int __init do_gpage_early_setup(char *param, char *val) |
| 259 | { |
| 260 | static phys_addr_t size; |
| 261 | unsigned long npages; |
| 262 | |
| 263 | /* |
| 264 | * The hugepagesz and hugepages cmdline options are interleaved. We |
| 265 | * use the size variable to keep track of whether or not this was done |
| 266 | * properly and skip over instances where it is incorrect. Other |
| 267 | * command-line parsing code will issue warnings, so we don't need to. |
| 268 | * |
| 269 | */ |
| 270 | if ((strcmp(param, "default_hugepagesz") == 0) || |
| 271 | (strcmp(param, "hugepagesz") == 0)) { |
| 272 | size = memparse(val, NULL); |
| 273 | } else if (strcmp(param, "hugepages") == 0) { |
| 274 | if (size != 0) { |
| 275 | if (sscanf(val, "%lu", &npages) <= 0) |
| 276 | npages = 0; |
| 277 | gpage_npages[shift_to_mmu_psize(__ffs(size))] = npages; |
| 278 | size = 0; |
| 279 | } |
| 280 | } |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | |
| 285 | /* |
| 286 | * This function allocates physical space for pages that are larger than the |
| 287 | * buddy allocator can handle. We want to allocate these in highmem because |
| 288 | * the amount of lowmem is limited. This means that this function MUST be |
| 289 | * called before lowmem_end_addr is set up in MMU_init() in order for the lmb |
| 290 | * allocate to grab highmem. |
| 291 | */ |
| 292 | void __init reserve_hugetlb_gpages(void) |
| 293 | { |
| 294 | static __initdata char cmdline[COMMAND_LINE_SIZE]; |
| 295 | phys_addr_t size, base; |
| 296 | int i; |
| 297 | |
| 298 | strlcpy(cmdline, boot_command_line, COMMAND_LINE_SIZE); |
| 299 | parse_args("hugetlb gpages", cmdline, NULL, 0, &do_gpage_early_setup); |
| 300 | |
| 301 | /* |
| 302 | * Walk gpage list in reverse, allocating larger page sizes first. |
| 303 | * Skip over unsupported sizes, or sizes that have 0 gpages allocated. |
| 304 | * When we reach the point in the list where pages are no longer |
| 305 | * considered gpages, we're done. |
| 306 | */ |
| 307 | for (i = MMU_PAGE_COUNT-1; i >= 0; i--) { |
| 308 | if (mmu_psize_defs[i].shift == 0 || gpage_npages[i] == 0) |
| 309 | continue; |
| 310 | else if (mmu_psize_to_shift(i) < (MAX_ORDER + PAGE_SHIFT)) |
| 311 | break; |
| 312 | |
| 313 | size = (phys_addr_t)(1ULL << mmu_psize_to_shift(i)); |
| 314 | base = memblock_alloc_base(size * gpage_npages[i], size, |
| 315 | MEMBLOCK_ALLOC_ANYWHERE); |
| 316 | add_gpage(base, size, gpage_npages[i]); |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | #else /* PPC64 */ |
| 321 | |
| 322 | /* Build list of addresses of gigantic pages. This function is used in early |
| 323 | * boot before the buddy or bootmem allocator is setup. |
| 324 | */ |
| 325 | 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] | 326 | { |
| 327 | if (!addr) |
| 328 | return; |
| 329 | while (number_of_pages > 0) { |
| 330 | gpage_freearray[nr_gpages] = addr; |
| 331 | nr_gpages++; |
| 332 | number_of_pages--; |
| 333 | addr += page_size; |
| 334 | } |
| 335 | } |
| 336 | |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 337 | /* Moves the gigantic page addresses from the temporary list to the |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 338 | * huge_boot_pages list. |
| 339 | */ |
| 340 | int alloc_bootmem_huge_page(struct hstate *hstate) |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 341 | { |
| 342 | struct huge_bootmem_page *m; |
| 343 | if (nr_gpages == 0) |
| 344 | return 0; |
| 345 | m = phys_to_virt(gpage_freearray[--nr_gpages]); |
| 346 | gpage_freearray[nr_gpages] = 0; |
| 347 | list_add(&m->list, &huge_boot_pages); |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 348 | m->hstate = hstate; |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 349 | return 1; |
| 350 | } |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 351 | #endif |
Jon Tollefson | ec4b2c0 | 2008-07-23 21:27:53 -0700 | [diff] [blame] | 352 | |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 353 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
| 354 | { |
| 355 | return 0; |
| 356 | } |
| 357 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 358 | #ifdef CONFIG_PPC32 |
| 359 | #define HUGEPD_FREELIST_SIZE \ |
| 360 | ((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t)) |
| 361 | |
| 362 | struct hugepd_freelist { |
| 363 | struct rcu_head rcu; |
| 364 | unsigned int index; |
| 365 | void *ptes[0]; |
| 366 | }; |
| 367 | |
| 368 | static DEFINE_PER_CPU(struct hugepd_freelist *, hugepd_freelist_cur); |
| 369 | |
| 370 | static void hugepd_free_rcu_callback(struct rcu_head *head) |
| 371 | { |
| 372 | struct hugepd_freelist *batch = |
| 373 | container_of(head, struct hugepd_freelist, rcu); |
| 374 | unsigned int i; |
| 375 | |
| 376 | for (i = 0; i < batch->index; i++) |
| 377 | kmem_cache_free(hugepte_cache, batch->ptes[i]); |
| 378 | |
| 379 | free_page((unsigned long)batch); |
| 380 | } |
| 381 | |
| 382 | static void hugepd_free(struct mmu_gather *tlb, void *hugepte) |
| 383 | { |
| 384 | struct hugepd_freelist **batchp; |
| 385 | |
| 386 | batchp = &__get_cpu_var(hugepd_freelist_cur); |
| 387 | |
| 388 | if (atomic_read(&tlb->mm->mm_users) < 2 || |
| 389 | cpumask_equal(mm_cpumask(tlb->mm), |
| 390 | cpumask_of(smp_processor_id()))) { |
| 391 | kmem_cache_free(hugepte_cache, hugepte); |
| 392 | return; |
| 393 | } |
| 394 | |
| 395 | if (*batchp == NULL) { |
| 396 | *batchp = (struct hugepd_freelist *)__get_free_page(GFP_ATOMIC); |
| 397 | (*batchp)->index = 0; |
| 398 | } |
| 399 | |
| 400 | (*batchp)->ptes[(*batchp)->index++] = hugepte; |
| 401 | if ((*batchp)->index == HUGEPD_FREELIST_SIZE) { |
| 402 | call_rcu_sched(&(*batchp)->rcu, hugepd_free_rcu_callback); |
| 403 | *batchp = NULL; |
| 404 | } |
| 405 | } |
| 406 | #endif |
| 407 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 408 | static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshift, |
| 409 | unsigned long start, unsigned long end, |
| 410 | unsigned long floor, unsigned long ceiling) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 411 | { |
| 412 | pte_t *hugepte = hugepd_page(*hpdp); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 413 | int i; |
| 414 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 415 | unsigned long pdmask = ~((1UL << pdshift) - 1); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 416 | unsigned int num_hugepd = 1; |
| 417 | |
| 418 | #ifdef CONFIG_PPC64 |
| 419 | unsigned int shift = hugepd_shift(*hpdp); |
| 420 | #else |
| 421 | /* Note: On 32-bit the hpdp may be the first of several */ |
| 422 | num_hugepd = (1 << (hugepd_shift(*hpdp) - pdshift)); |
| 423 | #endif |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 424 | |
| 425 | start &= pdmask; |
| 426 | if (start < floor) |
| 427 | return; |
| 428 | if (ceiling) { |
| 429 | ceiling &= pdmask; |
| 430 | if (! ceiling) |
| 431 | return; |
| 432 | } |
| 433 | if (end - 1 > ceiling - 1) |
| 434 | return; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 435 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 436 | for (i = 0; i < num_hugepd; i++, hpdp++) |
| 437 | hpdp->pd = 0; |
| 438 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 439 | tlb->need_flush = 1; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 440 | #ifdef CONFIG_PPC64 |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 441 | pgtable_free_tlb(tlb, hugepte, pdshift - shift); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 442 | #else |
| 443 | hugepd_free(tlb, hugepte); |
| 444 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 445 | } |
| 446 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 447 | static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, |
| 448 | unsigned long addr, unsigned long end, |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 449 | unsigned long floor, unsigned long ceiling) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 450 | { |
| 451 | pmd_t *pmd; |
| 452 | unsigned long next; |
| 453 | unsigned long start; |
| 454 | |
| 455 | start = addr; |
| 456 | pmd = pmd_offset(pud, addr); |
| 457 | do { |
| 458 | next = pmd_addr_end(addr, end); |
| 459 | if (pmd_none(*pmd)) |
| 460 | continue; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 461 | free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT, |
| 462 | addr, next, floor, ceiling); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 463 | } while (pmd++, addr = next, addr != end); |
| 464 | |
| 465 | start &= PUD_MASK; |
| 466 | if (start < floor) |
| 467 | return; |
| 468 | if (ceiling) { |
| 469 | ceiling &= PUD_MASK; |
| 470 | if (!ceiling) |
| 471 | return; |
| 472 | } |
| 473 | if (end - 1 > ceiling - 1) |
| 474 | return; |
| 475 | |
| 476 | pmd = pmd_offset(pud, start); |
| 477 | pud_clear(pud); |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 478 | pmd_free_tlb(tlb, pmd, start); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 479 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 480 | |
| 481 | static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, |
| 482 | unsigned long addr, unsigned long end, |
| 483 | unsigned long floor, unsigned long ceiling) |
| 484 | { |
| 485 | pud_t *pud; |
| 486 | unsigned long next; |
| 487 | unsigned long start; |
| 488 | |
| 489 | start = addr; |
| 490 | pud = pud_offset(pgd, addr); |
| 491 | do { |
| 492 | next = pud_addr_end(addr, end); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 493 | if (!is_hugepd(pud)) { |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 494 | if (pud_none_or_clear_bad(pud)) |
| 495 | continue; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 496 | hugetlb_free_pmd_range(tlb, pud, addr, next, floor, |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 497 | ceiling); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 498 | } else { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 499 | free_hugepd_range(tlb, (hugepd_t *)pud, PUD_SHIFT, |
| 500 | addr, next, floor, ceiling); |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 501 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 502 | } while (pud++, addr = next, addr != end); |
| 503 | |
| 504 | start &= PGDIR_MASK; |
| 505 | if (start < floor) |
| 506 | return; |
| 507 | if (ceiling) { |
| 508 | ceiling &= PGDIR_MASK; |
| 509 | if (!ceiling) |
| 510 | return; |
| 511 | } |
| 512 | if (end - 1 > ceiling - 1) |
| 513 | return; |
| 514 | |
| 515 | pud = pud_offset(pgd, start); |
| 516 | pgd_clear(pgd); |
Benjamin Herrenschmidt | 9e1b32c | 2009-07-22 15:44:28 +1000 | [diff] [blame] | 517 | pud_free_tlb(tlb, pud, start); |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 518 | } |
| 519 | |
| 520 | /* |
| 521 | * This function frees user-level page tables of a process. |
| 522 | * |
| 523 | * Must be called with pagetable lock held. |
| 524 | */ |
Jan Beulich | 42b7772 | 2008-07-23 21:27:10 -0700 | [diff] [blame] | 525 | void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 526 | unsigned long addr, unsigned long end, |
| 527 | unsigned long floor, unsigned long ceiling) |
| 528 | { |
| 529 | pgd_t *pgd; |
| 530 | unsigned long next; |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 531 | |
| 532 | /* |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 533 | * Because there are a number of different possible pagetable |
| 534 | * layouts for hugepage ranges, we limit knowledge of how |
| 535 | * things should be laid out to the allocation path |
| 536 | * (huge_pte_alloc(), above). Everything else works out the |
| 537 | * structure as it goes from information in the hugepd |
| 538 | * pointers. That means that we can't here use the |
| 539 | * optimization used in the normal page free_pgd_range(), of |
| 540 | * checking whether we're actually covering a large enough |
| 541 | * range to have to do anything at the top level of the walk |
| 542 | * instead of at the bottom. |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 543 | * |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 544 | * To make sense of this, you should probably go read the big |
| 545 | * block comment at the top of the normal free_pgd_range(), |
| 546 | * too. |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 547 | */ |
| 548 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 549 | do { |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 550 | next = pgd_addr_end(addr, end); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 551 | pgd = pgd_offset(tlb->mm, addr); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 552 | if (!is_hugepd(pgd)) { |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 553 | if (pgd_none_or_clear_bad(pgd)) |
| 554 | continue; |
| 555 | hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling); |
| 556 | } else { |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 557 | #ifdef CONFIG_PPC32 |
| 558 | /* |
| 559 | * Increment next by the size of the huge mapping since |
| 560 | * on 32-bit there may be more than one entry at the pgd |
| 561 | * level for a single hugepage, but all of them point to |
| 562 | * the same kmem cache that holds the hugepte. |
| 563 | */ |
| 564 | next = addr + (1 << hugepd_shift(*(hugepd_t *)pgd)); |
| 565 | #endif |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 566 | free_hugepd_range(tlb, (hugepd_t *)pgd, PGDIR_SHIFT, |
| 567 | addr, next, floor, ceiling); |
David Gibson | 0b26425 | 2008-09-05 11:49:54 +1000 | [diff] [blame] | 568 | } |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 569 | } while (addr = next, addr != end); |
David Gibson | e28f7fa | 2005-08-05 19:39:06 +1000 | [diff] [blame] | 570 | } |
| 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | struct page * |
| 573 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) |
| 574 | { |
| 575 | pte_t *ptep; |
| 576 | struct page *page; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 577 | unsigned shift; |
| 578 | unsigned long mask; |
| 579 | |
| 580 | ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 582 | /* Verify it is a huge page else bail. */ |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 583 | if (!ptep || !shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | return ERR_PTR(-EINVAL); |
| 585 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 586 | mask = (1UL << shift) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | page = pte_page(*ptep); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 588 | if (page) |
| 589 | page += (address & mask) / PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
| 591 | return page; |
| 592 | } |
| 593 | |
| 594 | int pmd_huge(pmd_t pmd) |
| 595 | { |
| 596 | return 0; |
| 597 | } |
| 598 | |
Andi Kleen | ceb8687 | 2008-07-23 21:27:50 -0700 | [diff] [blame] | 599 | int pud_huge(pud_t pud) |
| 600 | { |
| 601 | return 0; |
| 602 | } |
| 603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | struct page * |
| 605 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, |
| 606 | pmd_t *pmd, int write) |
| 607 | { |
| 608 | BUG(); |
| 609 | return NULL; |
| 610 | } |
| 611 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 612 | static noinline int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, |
| 613 | unsigned long end, int write, struct page **pages, int *nr) |
| 614 | { |
| 615 | unsigned long mask; |
| 616 | unsigned long pte_end; |
Andrea Arcangeli | 3526741 | 2011-11-02 13:37:15 -0700 | [diff] [blame] | 617 | struct page *head, *page, *tail; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 618 | pte_t pte; |
| 619 | int refs; |
| 620 | |
| 621 | pte_end = (addr + sz) & ~(sz-1); |
| 622 | if (pte_end < end) |
| 623 | end = pte_end; |
| 624 | |
| 625 | pte = *ptep; |
| 626 | mask = _PAGE_PRESENT | _PAGE_USER; |
| 627 | if (write) |
| 628 | mask |= _PAGE_RW; |
| 629 | |
| 630 | if ((pte_val(pte) & mask) != mask) |
| 631 | return 0; |
| 632 | |
| 633 | /* hugepages are never "special" */ |
| 634 | VM_BUG_ON(!pfn_valid(pte_pfn(pte))); |
| 635 | |
| 636 | refs = 0; |
| 637 | head = pte_page(pte); |
| 638 | |
| 639 | page = head + ((addr & (sz-1)) >> PAGE_SHIFT); |
Andrea Arcangeli | 3526741 | 2011-11-02 13:37:15 -0700 | [diff] [blame] | 640 | tail = page; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 641 | do { |
| 642 | VM_BUG_ON(compound_head(page) != head); |
| 643 | pages[*nr] = page; |
| 644 | (*nr)++; |
| 645 | page++; |
| 646 | refs++; |
| 647 | } while (addr += PAGE_SIZE, addr != end); |
| 648 | |
| 649 | if (!page_cache_add_speculative(head, refs)) { |
| 650 | *nr -= refs; |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | if (unlikely(pte_val(pte) != pte_val(*ptep))) { |
| 655 | /* Could be optimized better */ |
Andrea Arcangeli | 8596468 | 2011-11-02 13:37:11 -0700 | [diff] [blame] | 656 | *nr -= refs; |
| 657 | while (refs--) |
Andrea Arcangeli | 405e44f | 2011-11-02 13:37:08 -0700 | [diff] [blame] | 658 | put_page(head); |
Andrea Arcangeli | cf592bf | 2011-11-02 13:37:19 -0700 | [diff] [blame] | 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * Any tail page need their mapcount reference taken before we |
| 664 | * return. |
| 665 | */ |
| 666 | while (refs--) { |
| 667 | if (PageTail(tail)) |
| 668 | get_huge_page_tail(tail); |
| 669 | tail++; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | return 1; |
| 673 | } |
| 674 | |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 675 | static unsigned long hugepte_addr_end(unsigned long addr, unsigned long end, |
| 676 | unsigned long sz) |
| 677 | { |
| 678 | unsigned long __boundary = (addr + sz) & ~(sz-1); |
| 679 | return (__boundary - 1 < end - 1) ? __boundary : end; |
| 680 | } |
| 681 | |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 682 | int gup_hugepd(hugepd_t *hugepd, unsigned pdshift, |
| 683 | unsigned long addr, unsigned long end, |
| 684 | int write, struct page **pages, int *nr) |
| 685 | { |
| 686 | pte_t *ptep; |
| 687 | unsigned long sz = 1UL << hugepd_shift(*hugepd); |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 688 | unsigned long next; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 689 | |
| 690 | ptep = hugepte_offset(hugepd, addr, pdshift); |
| 691 | do { |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 692 | next = hugepte_addr_end(addr, end, sz); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 693 | if (!gup_hugepte(ptep, sz, addr, end, write, pages, nr)) |
| 694 | return 0; |
David Gibson | 39adfa5 | 2009-11-23 20:03:40 +0000 | [diff] [blame] | 695 | } while (ptep++, addr = next, addr != end); |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 696 | |
| 697 | return 1; |
| 698 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
Becky Bruce | 7651295 | 2011-10-10 10:50:36 +0000 | [diff] [blame^] | 700 | #ifdef CONFIG_PPC_MM_SLICES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
| 702 | unsigned long len, unsigned long pgoff, |
| 703 | unsigned long flags) |
| 704 | { |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 705 | struct hstate *hstate = hstate_file(file); |
| 706 | int mmu_psize = shift_to_mmu_psize(huge_page_shift(hstate)); |
Brian King | 48f797d | 2008-12-04 04:07:54 +0000 | [diff] [blame] | 707 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 708 | return slice_get_unmapped_area(addr, len, flags, mmu_psize, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
Becky Bruce | 7651295 | 2011-10-10 10:50:36 +0000 | [diff] [blame^] | 710 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 712 | unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) |
| 713 | { |
Paul Mackerras | 25c29f9 | 2011-09-20 19:58:10 +0000 | [diff] [blame] | 714 | #ifdef CONFIG_PPC_MM_SLICES |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 715 | unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start); |
| 716 | |
| 717 | return 1UL << mmu_psize_to_shift(psize); |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 718 | #else |
| 719 | if (!is_vm_hugetlb_page(vma)) |
| 720 | return PAGE_SIZE; |
| 721 | |
| 722 | return huge_page_size(hstate_vma(vma)); |
| 723 | #endif |
| 724 | } |
| 725 | |
| 726 | static inline bool is_power_of_4(unsigned long x) |
| 727 | { |
| 728 | if (is_power_of_2(x)) |
| 729 | return (__ilog2(x) % 2) ? false : true; |
| 730 | return false; |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 731 | } |
| 732 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 733 | static int __init add_huge_page_size(unsigned long long size) |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 734 | { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 735 | int shift = __ffs(size); |
| 736 | int mmu_psize; |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 737 | |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 738 | /* Check that it is a page size supported by the hardware and |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 739 | * that it fits within pagetable and slice limits. */ |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 740 | #ifdef CONFIG_PPC_FSL_BOOK3E |
| 741 | if ((size < PAGE_SIZE) || !is_power_of_4(size)) |
| 742 | return -EINVAL; |
| 743 | #else |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 744 | if (!is_power_of_2(size) |
| 745 | || (shift > SLICE_HIGH_SHIFT) || (shift <= PAGE_SHIFT)) |
| 746 | return -EINVAL; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 747 | #endif |
Jon Tollefson | 9122434 | 2008-07-23 21:27:55 -0700 | [diff] [blame] | 748 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 749 | if ((mmu_psize = shift_to_mmu_psize(shift)) < 0) |
| 750 | return -EINVAL; |
| 751 | |
| 752 | #ifdef CONFIG_SPU_FS_64K_LS |
| 753 | /* Disable support for 64K huge pages when 64K SPU local store |
| 754 | * support is enabled as the current implementation conflicts. |
| 755 | */ |
| 756 | if (shift == PAGE_SHIFT_64K) |
| 757 | return -EINVAL; |
| 758 | #endif /* CONFIG_SPU_FS_64K_LS */ |
| 759 | |
| 760 | BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); |
| 761 | |
| 762 | /* Return if huge page size has already been setup */ |
| 763 | if (size_to_hstate(size)) |
| 764 | return 0; |
| 765 | |
| 766 | hugetlb_add_hstate(shift - PAGE_SHIFT); |
| 767 | |
| 768 | return 0; |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | static int __init hugepage_setup_sz(char *str) |
| 772 | { |
| 773 | unsigned long long size; |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 774 | |
| 775 | size = memparse(str, &str); |
| 776 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 777 | if (add_huge_page_size(size) != 0) |
Jon Tollefson | 4ec161c | 2008-01-04 09:59:50 +1100 | [diff] [blame] | 778 | printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size); |
| 779 | |
| 780 | return 1; |
| 781 | } |
| 782 | __setup("hugepagesz=", hugepage_setup_sz); |
| 783 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 784 | #ifdef CONFIG_FSL_BOOKE |
| 785 | struct kmem_cache *hugepte_cache; |
| 786 | static int __init hugetlbpage_init(void) |
| 787 | { |
| 788 | int psize; |
| 789 | |
| 790 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { |
| 791 | unsigned shift; |
| 792 | |
| 793 | if (!mmu_psize_defs[psize].shift) |
| 794 | continue; |
| 795 | |
| 796 | shift = mmu_psize_to_shift(psize); |
| 797 | |
| 798 | /* Don't treat normal page sizes as huge... */ |
| 799 | if (shift != PAGE_SHIFT) |
| 800 | if (add_huge_page_size(1ULL << shift) < 0) |
| 801 | continue; |
| 802 | } |
| 803 | |
| 804 | /* |
| 805 | * Create a kmem cache for hugeptes. The bottom bits in the pte have |
| 806 | * size information encoded in them, so align them to allow this |
| 807 | */ |
| 808 | hugepte_cache = kmem_cache_create("hugepte-cache", sizeof(pte_t), |
| 809 | HUGEPD_SHIFT_MASK + 1, 0, NULL); |
| 810 | if (hugepte_cache == NULL) |
| 811 | panic("%s: Unable to create kmem cache for hugeptes\n", |
| 812 | __func__); |
| 813 | |
| 814 | /* Default hpage size = 4M */ |
| 815 | if (mmu_psize_defs[MMU_PAGE_4M].shift) |
| 816 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_4M].shift; |
| 817 | else |
| 818 | panic("%s: Unable to set default huge page size\n", __func__); |
| 819 | |
| 820 | |
| 821 | return 0; |
| 822 | } |
| 823 | #else |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 824 | static int __init hugetlbpage_init(void) |
| 825 | { |
David Gibson | a4fe3ce | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 826 | int psize; |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 827 | |
Matt Evans | 44ae3ab | 2011-04-06 19:48:50 +0000 | [diff] [blame] | 828 | if (!mmu_has_feature(MMU_FTR_16M_PAGE)) |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 829 | return -ENODEV; |
Benjamin Herrenschmidt | 00df438 | 2008-07-28 16:13:18 +1000 | [diff] [blame] | 830 | |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 831 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 832 | unsigned shift; |
| 833 | unsigned pdshift; |
| 834 | |
| 835 | if (!mmu_psize_defs[psize].shift) |
| 836 | continue; |
| 837 | |
| 838 | shift = mmu_psize_to_shift(psize); |
| 839 | |
| 840 | if (add_huge_page_size(1ULL << shift) < 0) |
| 841 | continue; |
| 842 | |
| 843 | if (shift < PMD_SHIFT) |
| 844 | pdshift = PMD_SHIFT; |
| 845 | else if (shift < PUD_SHIFT) |
| 846 | pdshift = PUD_SHIFT; |
| 847 | else |
| 848 | pdshift = PGDIR_SHIFT; |
| 849 | |
| 850 | pgtable_cache_add(pdshift - shift, NULL); |
| 851 | if (!PGT_CACHE(pdshift - shift)) |
| 852 | panic("hugetlbpage_init(): could not create " |
| 853 | "pgtable cache for %d bit pagesize\n", shift); |
Jon Tollefson | 0d9ea75 | 2008-07-23 21:27:56 -0700 | [diff] [blame] | 854 | } |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 855 | |
David Gibson | d1837cb | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 856 | /* Set default large page size. Currently, we pick 16M or 1M |
| 857 | * depending on what is available |
| 858 | */ |
| 859 | if (mmu_psize_defs[MMU_PAGE_16M].shift) |
| 860 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_16M].shift; |
| 861 | else if (mmu_psize_defs[MMU_PAGE_1M].shift) |
| 862 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_1M].shift; |
| 863 | |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 864 | return 0; |
| 865 | } |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 866 | #endif |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 867 | module_init(hugetlbpage_init); |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 868 | |
| 869 | void flush_dcache_icache_hugepage(struct page *page) |
| 870 | { |
| 871 | int i; |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 872 | void *start; |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 873 | |
| 874 | BUG_ON(!PageCompound(page)); |
| 875 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 876 | for (i = 0; i < (1UL << compound_order(page)); i++) { |
| 877 | if (!PageHighMem(page)) { |
| 878 | __flush_dcache_icache(page_address(page+i)); |
| 879 | } else { |
| 880 | start = kmap_atomic(page+i, KM_PPC_SYNC_ICACHE); |
| 881 | __flush_dcache_icache(start); |
| 882 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); |
| 883 | } |
| 884 | } |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 885 | } |