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 #include <asm/firmware.h>
6
7 /*
8 * For radix we want generic code to handle hugetlb. But then if we want
9 * both hash and radix to be enabled together we need to workaround the
10 * limitations.
11 */
12 void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
13 void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
14
15 extern void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
16 unsigned long addr, pte_t *ptep,
17 pte_t old_pte, pte_t pte);
18
19 static inline int hstate_get_psize(struct hstate *hstate)
20 {
21 unsigned long shift;
22
23 shift = huge_page_shift(hstate);
24 if (shift == mmu_psize_defs[MMU_PAGE_2M].shift)
25 return MMU_PAGE_2M;
26 else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift)
27 return MMU_PAGE_1G;
28 else if (shift == mmu_psize_defs[MMU_PAGE_16M].shift)
29 return MMU_PAGE_16M;
30 else if (shift == mmu_psize_defs[MMU_PAGE_16G].shift)
31 return MMU_PAGE_16G;
32 else {
33 WARN(1, "Wrong huge page shift\n");
34 return mmu_virtual_psize;
35 }
36 }
37
38 #define __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED
39 static inline bool gigantic_page_runtime_supported(void)
40 {
41 /*
42 * We used gigantic page reservation with hypervisor assist in some case.
43 * We cannot use runtime allocation of gigantic pages in those platforms
44 * This is hash translation mode LPARs.
45 */
46 if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled())
47 return false;
48
49 return true;
50 }
51
52 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
53 extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
54 unsigned long addr, pte_t *ptep);
55
56 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
57 extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
58 unsigned long addr, pte_t *ptep,
59 pte_t old_pte, pte_t new_pte);
60
61 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
62 unsigned long vmaddr)
63 {
64 if (radix_enabled())
65 return radix__flush_hugetlb_page(vma, vmaddr);
66 }
67
68 void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
69
70 static inline int check_and_get_huge_psize(int shift)
71 {
72 int mmu_psize;
73
74 if (shift > SLICE_HIGH_SHIFT)
75 return -EINVAL;
76
77 mmu_psize = shift_to_mmu_psize(shift);
78
79 /*
80 * We need to make sure that for different page sizes reported by
81 * firmware we only add hugetlb support for page sizes that can be
82 * supported by linux page table layout.
83 * For now we have
84 * Radix: 2M and 1G
85 * Hash: 16M and 16G
86 */
87 if (radix_enabled()) {
88 if (mmu_psize != MMU_PAGE_2M && mmu_psize != MMU_PAGE_1G)
89 return -EINVAL;
90 } else {
91 if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G)
92 return -EINVAL;
93 }
94 return mmu_psize;
95 }
96
97 #endif
98
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