1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_BOOK3S_64_HUGETLB_H
3 #define _ASM_POWERPC_BOOK3S_64_HUGETLB_H
4 /*
5 * For radix we want generic code to handle hugetlb. But then if we want
6 * both hash and radix to be enabled together we need to workaround the
7 * limitations.
8 */
9 void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
10 void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
11 extern unsigned long
12 radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
13 unsigned long len, unsigned long pgoff,
14 unsigned long flags);
15
16 extern void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
17 unsigned long addr, pte_t *ptep,
18 pte_t old_pte, pte_t pte);
19
hstate_get_psize(struct hstate * hstate)20 static inline int hstate_get_psize(struct hstate *hstate)
21 {
22 unsigned long shift;
23
24 shift = huge_page_shift(hstate);
25 if (shift == mmu_psize_defs[MMU_PAGE_2M].shift)
26 return MMU_PAGE_2M;
27 else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift)
28 return MMU_PAGE_1G;
29 else if (shift == mmu_psize_defs[MMU_PAGE_16M].shift)
30 return MMU_PAGE_16M;
31 else if (shift == mmu_psize_defs[MMU_PAGE_16G].shift)
32 return MMU_PAGE_16G;
33 else {
34 WARN(1, "Wrong huge page shift\n");
35 return mmu_virtual_psize;
36 }
37 }
38
39 #define __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED
gigantic_page_runtime_supported(void)40 static inline bool gigantic_page_runtime_supported(void)
41 {
42 /*
43 * We used gigantic page reservation with hypervisor assist in some case.
44 * We cannot use runtime allocation of gigantic pages in those platforms
45 * This is hash translation mode LPARs.
46 */
47 if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled())
48 return false;
49
50 return true;
51 }
52
53 /* hugepd entry valid bit */
54 #define HUGEPD_VAL_BITS (0x8000000000000000UL)
55
56 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
57 extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
58 unsigned long addr, pte_t *ptep);
59
60 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
61 extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
62 unsigned long addr, pte_t *ptep,
63 pte_t old_pte, pte_t new_pte);
64 /*
65 * This should work for other subarchs too. But right now we use the
66 * new format only for 64bit book3s
67 */
hugepd_page(hugepd_t hpd)68 static inline pte_t *hugepd_page(hugepd_t hpd)
69 {
70 BUG_ON(!hugepd_ok(hpd));
71 /*
72 * We have only four bits to encode, MMU page size
73 */
74 BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
75 return __va(hpd_val(hpd) & HUGEPD_ADDR_MASK);
76 }
77
hugepd_mmu_psize(hugepd_t hpd)78 static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
79 {
80 return (hpd_val(hpd) & HUGEPD_SHIFT_MASK) >> 2;
81 }
82
hugepd_shift(hugepd_t hpd)83 static inline unsigned int hugepd_shift(hugepd_t hpd)
84 {
85 return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
86 }
flush_hugetlb_page(struct vm_area_struct * vma,unsigned long vmaddr)87 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
88 unsigned long vmaddr)
89 {
90 if (radix_enabled())
91 return radix__flush_hugetlb_page(vma, vmaddr);
92 }
93
hugepte_offset(hugepd_t hpd,unsigned long addr,unsigned int pdshift)94 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
95 unsigned int pdshift)
96 {
97 unsigned long idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
98
99 return hugepd_page(hpd) + idx;
100 }
101
hugepd_populate(hugepd_t * hpdp,pte_t * new,unsigned int pshift)102 static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
103 {
104 *hpdp = __hugepd(__pa(new) | HUGEPD_VAL_BITS | (shift_to_mmu_psize(pshift) << 2));
105 }
106
107 void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
108
check_and_get_huge_psize(int shift)109 static inline int check_and_get_huge_psize(int shift)
110 {
111 int mmu_psize;
112
113 if (shift > SLICE_HIGH_SHIFT)
114 return -EINVAL;
115
116 mmu_psize = shift_to_mmu_psize(shift);
117
118 /*
119 * We need to make sure that for different page sizes reported by
120 * firmware we only add hugetlb support for page sizes that can be
121 * supported by linux page table layout.
122 * For now we have
123 * Radix: 2M and 1G
124 * Hash: 16M and 16G
125 */
126 if (radix_enabled()) {
127 if (mmu_psize != MMU_PAGE_2M && mmu_psize != MMU_PAGE_1G)
128 return -EINVAL;
129 } else {
130 if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G)
131 return -EINVAL;
132 }
133 return mmu_psize;
134 }
135
136 #endif
137
