1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_PGTABLE_RADIX_H 3 #define _ASM_POWERPC_PGTABLE_RADIX_H 4 5 #include <asm/asm-const.h> 6 7 #ifndef __ASSEMBLY__ 8 #include <asm/cmpxchg.h> 9 #endif 10 11 #ifdef CONFIG_PPC_64K_PAGES 12 #include <asm/book3s/64/radix-64k.h> 13 #else 14 #include <asm/book3s/64/radix-4k.h> 15 #endif 16 17 #ifndef __ASSEMBLY__ 18 #include <asm/book3s/64/tlbflush-radix.h> 19 #include <asm/cpu_has_feature.h> 20 #endif 21 22 /* An empty PTE can still have a R or C writeback */ 23 #define RADIX_PTE_NONE_MASK (_PAGE_DIRTY | _PAGE_ACCESSED) 24 25 /* Bits to set in a RPMD/RPUD/RPGD */ 26 #define RADIX_PMD_VAL_BITS (0x8000000000000000UL | RADIX_PTE_INDEX_SIZE) 27 #define RADIX_PUD_VAL_BITS (0x8000000000000000UL | RADIX_PMD_INDEX_SIZE) 28 #define RADIX_PGD_VAL_BITS (0x8000000000000000UL | RADIX_PUD_INDEX_SIZE) 29 30 /* Don't have anything in the reserved bits and leaf bits */ 31 #define RADIX_PMD_BAD_BITS 0x60000000000000e0UL 32 #define RADIX_PUD_BAD_BITS 0x60000000000000e0UL 33 #define RADIX_P4D_BAD_BITS 0x60000000000000e0UL 34 35 #define RADIX_PMD_SHIFT (PAGE_SHIFT + RADIX_PTE_INDEX_SIZE) 36 #define RADIX_PUD_SHIFT (RADIX_PMD_SHIFT + RADIX_PMD_INDEX_SIZE) 37 #define RADIX_PGD_SHIFT (RADIX_PUD_SHIFT + RADIX_PUD_INDEX_SIZE) 38 /* 39 * Size of EA range mapped by our pagetables. 40 */ 41 #define RADIX_PGTABLE_EADDR_SIZE (RADIX_PTE_INDEX_SIZE + RADIX_PMD_INDEX_SIZE + \ 42 RADIX_PUD_INDEX_SIZE + RADIX_PGD_INDEX_SIZE + PAGE_SHIFT) 43 #define RADIX_PGTABLE_RANGE (ASM_CONST(1) << RADIX_PGTABLE_EADDR_SIZE) 44 45 /* 46 * We support 52 bit address space, Use top bit for kernel 47 * virtual mapping. Also make sure kernel fit in the top 48 * quadrant. 49 * 50 * +------------------+ 51 * +------------------+ Kernel virtual map (0xc008000000000000) 52 * | | 53 * | | 54 * | | 55 * 0b11......+------------------+ Kernel linear map (0xc....) 56 * | | 57 * | 2 quadrant | 58 * | | 59 * 0b10......+------------------+ 60 * | | 61 * | 1 quadrant | 62 * | | 63 * 0b01......+------------------+ 64 * | | 65 * | 0 quadrant | 66 * | | 67 * 0b00......+------------------+ 68 * 69 * 70 * 3rd quadrant expanded: 71 * +------------------------------+ 72 * | | 73 * | | 74 * | | 75 * +------------------------------+ Kernel vmemmap end (0xc010000000000000) 76 * | | 77 * | 512TB | 78 * | | 79 * +------------------------------+ Kernel IO map end/vmemap start 80 * | | 81 * | 512TB | 82 * | | 83 * +------------------------------+ Kernel vmap end/ IO map start 84 * | | 85 * | 512TB | 86 * | | 87 * +------------------------------+ Kernel virt start (0xc008000000000000) 88 * | | 89 * | | 90 * | | 91 * +------------------------------+ Kernel linear (0xc.....) 92 */ 93 94 95 /* 96 * If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS 97 * if we increase SECTIONS_WIDTH we will not store node details in page->flags and 98 * page_to_nid does a page->section->node lookup 99 * Hence only increase for VMEMMAP. Further depending on SPARSEMEM_EXTREME reduce 100 * memory requirements with large number of sections. 101 * 51 bits is the max physical real address on POWER9 102 */ 103 104 #if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) 105 #define R_MAX_PHYSMEM_BITS 51 106 #else 107 #define R_MAX_PHYSMEM_BITS 46 108 #endif 109 110 #define RADIX_KERN_VIRT_START ASM_CONST(0xc008000000000000) 111 /* 112 * 49 = MAX_EA_BITS_PER_CONTEXT (hash specific). To make sure we pick 113 * the same value as hash. 114 */ 115 #define RADIX_KERN_MAP_SIZE (1UL << 49) 116 117 #define RADIX_VMALLOC_START RADIX_KERN_VIRT_START 118 #define RADIX_VMALLOC_SIZE RADIX_KERN_MAP_SIZE 119 #define RADIX_VMALLOC_END (RADIX_VMALLOC_START + RADIX_VMALLOC_SIZE) 120 121 #define RADIX_KERN_IO_START RADIX_VMALLOC_END 122 #define RADIX_KERN_IO_SIZE RADIX_KERN_MAP_SIZE 123 #define RADIX_KERN_IO_END (RADIX_KERN_IO_START + RADIX_KERN_IO_SIZE) 124 125 #define RADIX_VMEMMAP_START RADIX_KERN_IO_END 126 #define RADIX_VMEMMAP_SIZE RADIX_KERN_MAP_SIZE 127 #define RADIX_VMEMMAP_END (RADIX_VMEMMAP_START + RADIX_VMEMMAP_SIZE) 128 129 #ifndef __ASSEMBLY__ 130 #define RADIX_PTE_TABLE_SIZE (sizeof(pte_t) << RADIX_PTE_INDEX_SIZE) 131 #define RADIX_PMD_TABLE_SIZE (sizeof(pmd_t) << RADIX_PMD_INDEX_SIZE) 132 #define RADIX_PUD_TABLE_SIZE (sizeof(pud_t) << RADIX_PUD_INDEX_SIZE) 133 #define RADIX_PGD_TABLE_SIZE (sizeof(pgd_t) << RADIX_PGD_INDEX_SIZE) 134 135 #ifdef CONFIG_STRICT_KERNEL_RWX 136 extern void radix__mark_rodata_ro(void); 137 extern void radix__mark_initmem_nx(void); 138 #endif 139 140 extern void radix__ptep_set_access_flags(struct vm_area_struct *vma, pte_t *ptep, 141 pte_t entry, unsigned long address, 142 int psize); 143 144 extern void radix__ptep_modify_prot_commit(struct vm_area_struct *vma, 145 unsigned long addr, pte_t *ptep, 146 pte_t old_pte, pte_t pte); 147 148 static inline unsigned long __radix_pte_update(pte_t *ptep, unsigned long clr, 149 unsigned long set) 150 { 151 __be64 old_be, tmp_be; 152 153 __asm__ __volatile__( 154 "1: ldarx %0,0,%3 # pte_update\n" 155 " andc %1,%0,%5 \n" 156 " or %1,%1,%4 \n" 157 " stdcx. %1,0,%3 \n" 158 " bne- 1b" 159 : "=&r" (old_be), "=&r" (tmp_be), "=m" (*ptep) 160 : "r" (ptep), "r" (cpu_to_be64(set)), "r" (cpu_to_be64(clr)) 161 : "cc" ); 162 163 return be64_to_cpu(old_be); 164 } 165 166 static inline unsigned long radix__pte_update(struct mm_struct *mm, 167 unsigned long addr, 168 pte_t *ptep, unsigned long clr, 169 unsigned long set, 170 int huge) 171 { 172 unsigned long old_pte; 173 174 old_pte = __radix_pte_update(ptep, clr, set); 175 if (!huge) 176 assert_pte_locked(mm, addr); 177 178 return old_pte; 179 } 180 181 static inline pte_t radix__ptep_get_and_clear_full(struct mm_struct *mm, 182 unsigned long addr, 183 pte_t *ptep, int full) 184 { 185 unsigned long old_pte; 186 187 if (full) { 188 old_pte = pte_val(*ptep); 189 *ptep = __pte(0); 190 } else 191 old_pte = radix__pte_update(mm, addr, ptep, ~0ul, 0, 0); 192 193 return __pte(old_pte); 194 } 195 196 static inline int radix__pte_same(pte_t pte_a, pte_t pte_b) 197 { 198 return ((pte_raw(pte_a) ^ pte_raw(pte_b)) == 0); 199 } 200 201 static inline int radix__pte_none(pte_t pte) 202 { 203 return (pte_val(pte) & ~RADIX_PTE_NONE_MASK) == 0; 204 } 205 206 static inline void radix__set_pte_at(struct mm_struct *mm, unsigned long addr, 207 pte_t *ptep, pte_t pte, int percpu) 208 { 209 *ptep = pte; 210 211 /* 212 * The architecture suggests a ptesync after setting the pte, which 213 * orders the store that updates the pte with subsequent page table 214 * walk accesses which may load the pte. Without this it may be 215 * possible for a subsequent access to result in spurious fault. 216 * 217 * This is not necessary for correctness, because a spurious fault 218 * is tolerated by the page fault handler, and this store will 219 * eventually be seen. In testing, there was no noticable increase 220 * in user faults on POWER9. Avoiding ptesync here is a significant 221 * win for things like fork. If a future microarchitecture benefits 222 * from ptesync, it should probably go into update_mmu_cache, rather 223 * than set_pte_at (which is used to set ptes unrelated to faults). 224 * 225 * Spurious faults from the kernel memory are not tolerated, so there 226 * is a ptesync in flush_cache_vmap, and __map_kernel_page() follows 227 * the pte update sequence from ISA Book III 6.10 Translation Table 228 * Update Synchronization Requirements. 229 */ 230 } 231 232 static inline int radix__pmd_bad(pmd_t pmd) 233 { 234 return !!(pmd_val(pmd) & RADIX_PMD_BAD_BITS); 235 } 236 237 static inline int radix__pmd_same(pmd_t pmd_a, pmd_t pmd_b) 238 { 239 return ((pmd_raw(pmd_a) ^ pmd_raw(pmd_b)) == 0); 240 } 241 242 static inline int radix__pud_bad(pud_t pud) 243 { 244 return !!(pud_val(pud) & RADIX_PUD_BAD_BITS); 245 } 246 247 248 static inline int radix__p4d_bad(p4d_t p4d) 249 { 250 return !!(p4d_val(p4d) & RADIX_P4D_BAD_BITS); 251 } 252 253 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 254 255 static inline int radix__pmd_trans_huge(pmd_t pmd) 256 { 257 return (pmd_val(pmd) & (_PAGE_PTE | _PAGE_DEVMAP)) == _PAGE_PTE; 258 } 259 260 static inline pmd_t radix__pmd_mkhuge(pmd_t pmd) 261 { 262 return __pmd(pmd_val(pmd) | _PAGE_PTE); 263 } 264 265 extern unsigned long radix__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, 266 pmd_t *pmdp, unsigned long clr, 267 unsigned long set); 268 extern pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma, 269 unsigned long address, pmd_t *pmdp); 270 extern void radix__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, 271 pgtable_t pgtable); 272 extern pgtable_t radix__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); 273 extern pmd_t radix__pmdp_huge_get_and_clear(struct mm_struct *mm, 274 unsigned long addr, pmd_t *pmdp); 275 static inline int radix__has_transparent_hugepage(void) 276 { 277 /* For radix 2M at PMD level means thp */ 278 if (mmu_psize_defs[MMU_PAGE_2M].shift == PMD_SHIFT) 279 return 1; 280 return 0; 281 } 282 #endif 283 284 static inline pmd_t radix__pmd_mkdevmap(pmd_t pmd) 285 { 286 return __pmd(pmd_val(pmd) | (_PAGE_PTE | _PAGE_DEVMAP)); 287 } 288 289 extern int __meminit radix__vmemmap_create_mapping(unsigned long start, 290 unsigned long page_size, 291 unsigned long phys); 292 extern void radix__vmemmap_remove_mapping(unsigned long start, 293 unsigned long page_size); 294 295 extern int radix__map_kernel_page(unsigned long ea, unsigned long pa, 296 pgprot_t flags, unsigned int psz); 297 298 static inline unsigned long radix__get_tree_size(void) 299 { 300 unsigned long rts_field; 301 /* 302 * We support 52 bits, hence: 303 * bits 52 - 31 = 21, 0b10101 304 * RTS encoding details 305 * bits 0 - 3 of rts -> bits 6 - 8 unsigned long 306 * bits 4 - 5 of rts -> bits 62 - 63 of unsigned long 307 */ 308 rts_field = (0x5UL << 5); /* 6 - 8 bits */ 309 rts_field |= (0x2UL << 61); 310 311 return rts_field; 312 } 313 314 #ifdef CONFIG_MEMORY_HOTPLUG 315 int radix__create_section_mapping(unsigned long start, unsigned long end, 316 int nid, pgprot_t prot); 317 int radix__remove_section_mapping(unsigned long start, unsigned long end); 318 #endif /* CONFIG_MEMORY_HOTPLUG */ 319 320 void radix__kernel_map_pages(struct page *page, int numpages, int enable); 321 322 #endif /* __ASSEMBLY__ */ 323 #endif 324