hash-4k.h (5004B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H 3#define _ASM_POWERPC_BOOK3S_64_HASH_4K_H 4 5#define H_PTE_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 4KB = 2MB 6#define H_PMD_INDEX_SIZE 7 // size: 8B << 7 = 1KB, maps: 2^7 x 2MB = 256MB 7#define H_PUD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 256MB = 128GB 8#define H_PGD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 128GB = 64TB 9 10/* 11 * Each context is 512TB. But on 4k we restrict our max TASK size to 64TB 12 * Hence also limit max EA bits to 64TB. 13 */ 14#define MAX_EA_BITS_PER_CONTEXT 46 15 16 17/* 18 * Our page table limit us to 64TB. For 64TB physical memory, we only need 64GB 19 * of vmemmap space. To better support sparse memory layout, we use 61TB 20 * linear map range, 1TB of vmalloc, 1TB of I/O and 1TB of vmememmap. 21 */ 22#define REGION_SHIFT (40) 23#define H_KERN_MAP_SIZE (ASM_CONST(1) << REGION_SHIFT) 24 25/* 26 * Limits the linear mapping range 27 */ 28#define H_MAX_PHYSMEM_BITS 46 29 30/* 31 * Define the address range of the kernel non-linear virtual area (61TB) 32 */ 33#define H_KERN_VIRT_START ASM_CONST(0xc0003d0000000000) 34 35#ifndef __ASSEMBLY__ 36#define H_PTE_TABLE_SIZE (sizeof(pte_t) << H_PTE_INDEX_SIZE) 37#define H_PMD_TABLE_SIZE (sizeof(pmd_t) << H_PMD_INDEX_SIZE) 38#define H_PUD_TABLE_SIZE (sizeof(pud_t) << H_PUD_INDEX_SIZE) 39#define H_PGD_TABLE_SIZE (sizeof(pgd_t) << H_PGD_INDEX_SIZE) 40 41#define H_PAGE_F_GIX_SHIFT _PAGE_PA_MAX 42#define H_PAGE_F_SECOND _RPAGE_PKEY_BIT0 /* HPTE is in 2ndary HPTEG */ 43#define H_PAGE_F_GIX (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41) 44#define H_PAGE_BUSY _RPAGE_RSV1 45#define H_PAGE_HASHPTE _RPAGE_PKEY_BIT4 46 47/* PTE flags to conserve for HPTE identification */ 48#define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \ 49 H_PAGE_F_SECOND | H_PAGE_F_GIX) 50/* 51 * Not supported by 4k linux page size 52 */ 53#define H_PAGE_4K_PFN 0x0 54#define H_PAGE_THP_HUGE 0x0 55#define H_PAGE_COMBO 0x0 56 57/* 8 bytes per each pte entry */ 58#define H_PTE_FRAG_SIZE_SHIFT (H_PTE_INDEX_SIZE + 3) 59#define H_PTE_FRAG_NR (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT) 60#define H_PMD_FRAG_SIZE_SHIFT (H_PMD_INDEX_SIZE + 3) 61#define H_PMD_FRAG_NR (PAGE_SIZE >> H_PMD_FRAG_SIZE_SHIFT) 62 63/* memory key bits, only 8 keys supported */ 64#define H_PTE_PKEY_BIT4 0 65#define H_PTE_PKEY_BIT3 0 66#define H_PTE_PKEY_BIT2 _RPAGE_PKEY_BIT3 67#define H_PTE_PKEY_BIT1 _RPAGE_PKEY_BIT2 68#define H_PTE_PKEY_BIT0 _RPAGE_PKEY_BIT1 69 70 71/* 72 * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() 73 */ 74#define remap_4k_pfn(vma, addr, pfn, prot) \ 75 remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) 76 77#ifdef CONFIG_HUGETLB_PAGE 78static inline int hash__hugepd_ok(hugepd_t hpd) 79{ 80 unsigned long hpdval = hpd_val(hpd); 81 /* 82 * if it is not a pte and have hugepd shift mask 83 * set, then it is a hugepd directory pointer 84 */ 85 if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) && 86 ((hpdval & HUGEPD_SHIFT_MASK) != 0)) 87 return true; 88 return false; 89} 90#endif 91 92/* 93 * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just 94 * a matter of returning the PTE bits that need to be modified. On 64K PTE, 95 * things are a little more involved and hence needs many more parameters to 96 * accomplish the same. However we want to abstract this out from the caller by 97 * keeping the prototype consistent across the two formats. 98 */ 99static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, 100 unsigned int subpg_index, unsigned long hidx, 101 int offset) 102{ 103 return (hidx << H_PAGE_F_GIX_SHIFT) & 104 (H_PAGE_F_SECOND | H_PAGE_F_GIX); 105} 106 107#ifdef CONFIG_TRANSPARENT_HUGEPAGE 108 109static inline char *get_hpte_slot_array(pmd_t *pmdp) 110{ 111 BUG(); 112 return NULL; 113} 114 115static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) 116{ 117 BUG(); 118 return 0; 119} 120 121static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, 122 int index) 123{ 124 BUG(); 125 return 0; 126} 127 128static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, 129 unsigned int index, unsigned int hidx) 130{ 131 BUG(); 132} 133 134static inline int hash__pmd_trans_huge(pmd_t pmd) 135{ 136 return 0; 137} 138 139static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b) 140{ 141 BUG(); 142 return 0; 143} 144 145static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) 146{ 147 BUG(); 148 return pmd; 149} 150 151extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, 152 unsigned long addr, pmd_t *pmdp, 153 unsigned long clr, unsigned long set); 154extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, 155 unsigned long address, pmd_t *pmdp); 156extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, 157 pgtable_t pgtable); 158extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); 159extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, 160 unsigned long addr, pmd_t *pmdp); 161extern int hash__has_transparent_hugepage(void); 162#endif 163 164static inline pmd_t hash__pmd_mkdevmap(pmd_t pmd) 165{ 166 BUG(); 167 return pmd; 168} 169 170#endif /* !__ASSEMBLY__ */ 171 172#endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */