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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
ab537dca AK |
2 | #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H |
3 | #define _ASM_POWERPC_BOOK3S_64_HASH_4K_H | |
423e2f94 | 4 | |
eea86aa4 ME |
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 | |
ab537dca | 9 | |
f384796c AK |
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 | ||
1c946c1b | 16 | |
0034d395 | 17 | /* |
7746406b AK |
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. | |
0034d395 | 21 | */ |
7746406b | 22 | #define REGION_SHIFT (40) |
1c946c1b | 23 | #define H_KERN_MAP_SIZE (ASM_CONST(1) << REGION_SHIFT) |
0034d395 | 24 | |
b32d5d7e AK |
25 | /* |
26 | * Limits the linear mapping range | |
27 | */ | |
28 | #define H_MAX_PHYSMEM_BITS 46 | |
29 | ||
0034d395 | 30 | /* |
7746406b | 31 | * Define the address range of the kernel non-linear virtual area (61TB) |
0034d395 | 32 | */ |
7746406b | 33 | #define H_KERN_VIRT_START ASM_CONST(0xc0003d0000000000) |
0034d395 | 34 | |
ab537dca | 35 | #ifndef __ASSEMBLY__ |
dd1842a2 AK |
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) | |
ab537dca | 40 | |
ee8b3933 AK |
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 | |
9d2edb18 | 46 | |
c605782b | 47 | /* PTE flags to conserve for HPTE identification */ |
945537df AK |
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 | |
1c7ec8a4 AK |
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) | |
8a6c697b AK |
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) | |
1a2f7789 AK |
62 | |
63 | /* memory key bits, only 8 keys supported */ | |
33699023 AK |
64 | #define H_PTE_PKEY_BIT4 0 |
65 | #define H_PTE_PKEY_BIT3 0 | |
ee8b3933 AK |
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 | |
33699023 | 69 | |
1a2f7789 | 70 | |
ab537dca | 71 | /* |
368ced78 | 72 | * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() |
ab537dca | 73 | */ |
ab537dca AK |
74 | #define remap_4k_pfn(vma, addr, pfn, prot) \ |
75 | remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) | |
76 | ||
26a344ae | 77 | #ifdef CONFIG_HUGETLB_PAGE |
c0a6c719 | 78 | static inline int hash__hugepd_ok(hugepd_t hpd) |
26a344ae | 79 | { |
20717e1f | 80 | unsigned long hpdval = hpd_val(hpd); |
26a344ae | 81 | /* |
6a119eae AK |
82 | * if it is not a pte and have hugepd shift mask |
83 | * set, then it is a hugepd directory pointer | |
26a344ae | 84 | */ |
f1981b5b | 85 | if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) && |
20717e1f | 86 | ((hpdval & HUGEPD_SHIFT_MASK) != 0)) |
6a119eae AK |
87 | return true; |
88 | return false; | |
26a344ae | 89 | } |
26a344ae AK |
90 | #endif |
91 | ||
59aa31fd RP |
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 | */ | |
99 | static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, | |
ff31e105 AK |
100 | unsigned int subpg_index, unsigned long hidx, |
101 | int offset) | |
59aa31fd RP |
102 | { |
103 | return (hidx << H_PAGE_F_GIX_SHIFT) & | |
104 | (H_PAGE_F_SECOND | H_PAGE_F_GIX); | |
105 | } | |
106 | ||
ab624762 AK |
107 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
108 | ||
109 | static inline char *get_hpte_slot_array(pmd_t *pmdp) | |
110 | { | |
111 | BUG(); | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) | |
116 | { | |
117 | BUG(); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, | |
122 | int index) | |
123 | { | |
124 | BUG(); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, | |
129 | unsigned int index, unsigned int hidx) | |
130 | { | |
131 | BUG(); | |
132 | } | |
133 | ||
134 | static inline int hash__pmd_trans_huge(pmd_t pmd) | |
135 | { | |
136 | return 0; | |
137 | } | |
138 | ||
ab624762 AK |
139 | static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) |
140 | { | |
141 | BUG(); | |
142 | return pmd; | |
143 | } | |
144 | ||
145 | extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, | |
146 | unsigned long addr, pmd_t *pmdp, | |
147 | unsigned long clr, unsigned long set); | |
148 | extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, | |
149 | unsigned long address, pmd_t *pmdp); | |
150 | extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, | |
151 | pgtable_t pgtable); | |
152 | extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); | |
ab624762 AK |
153 | extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, |
154 | unsigned long addr, pmd_t *pmdp); | |
155 | extern int hash__has_transparent_hugepage(void); | |
156 | #endif | |
157 | ||
36b78402 AK |
158 | static inline pmd_t hash__pmd_mkdevmap(pmd_t pmd) |
159 | { | |
160 | BUG(); | |
161 | return pmd; | |
162 | } | |
163 | ||
ab537dca AK |
164 | #endif /* !__ASSEMBLY__ */ |
165 | ||
166 | #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */ |