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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * IA-64 Huge TLB Page Support for Kernel.
4 *
5 * Copyright (C) 2002-2004 Rohit Seth <rohit.seth@intel.com>
6 * Copyright (C) 2003-2004 Ken Chen <kenneth.w.chen@intel.com>
7 *
8 * Sep, 2003: add numa support
9 * Feb, 2004: dynamic hugetlb page size via boot parameter
10 */
11
12#include <linux/init.h>
13#include <linux/fs.h>
14#include <linux/mm.h>
15#include <linux/hugetlb.h>
16#include <linux/pagemap.h>
17#include <linux/module.h>
18#include <linux/sysctl.h>
19#include <linux/log2.h>
20#include <asm/mman.h>
21#include <asm/tlb.h>
22#include <asm/tlbflush.h>
23
24unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT;
25EXPORT_SYMBOL(hpage_shift);
26
27pte_t *
28huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
29{
30 unsigned long taddr = htlbpage_to_page(addr);
31 pgd_t *pgd;
32 p4d_t *p4d;
33 pud_t *pud;
34 pmd_t *pmd;
35 pte_t *pte = NULL;
36
37 pgd = pgd_offset(mm, taddr);
38 p4d = p4d_offset(pgd, taddr);
39 pud = pud_alloc(mm, p4d, taddr);
40 if (pud) {
41 pmd = pmd_alloc(mm, pud, taddr);
42 if (pmd)
43 pte = pte_alloc_map(mm, pmd, taddr);
44 }
45 return pte;
46}
47
48pte_t *
49huge_pte_offset (struct mm_struct *mm, unsigned long addr, unsigned long sz)
50{
51 unsigned long taddr = htlbpage_to_page(addr);
52 pgd_t *pgd;
53 p4d_t *p4d;
54 pud_t *pud;
55 pmd_t *pmd;
56 pte_t *pte = NULL;
57
58 pgd = pgd_offset(mm, taddr);
59 if (pgd_present(*pgd)) {
60 p4d = p4d_offset(pgd, addr);
61 if (p4d_present(*p4d)) {
62 pud = pud_offset(p4d, taddr);
63 if (pud_present(*pud)) {
64 pmd = pmd_offset(pud, taddr);
65 if (pmd_present(*pmd))
66 pte = pte_offset_map(pmd, taddr);
67 }
68 }
69 }
70
71 return pte;
72}
73
74#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }
75
76/*
77 * Don't actually need to do any preparation, but need to make sure
78 * the address is in the right region.
79 */
80int prepare_hugepage_range(struct file *file,
81 unsigned long addr, unsigned long len)
82{
83 if (len & ~HPAGE_MASK)
84 return -EINVAL;
85 if (addr & ~HPAGE_MASK)
86 return -EINVAL;
87 if (REGION_NUMBER(addr) != RGN_HPAGE)
88 return -EINVAL;
89
90 return 0;
91}
92
93struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write)
94{
95 struct page *page;
96 pte_t *ptep;
97
98 if (REGION_NUMBER(addr) != RGN_HPAGE)
99 return ERR_PTR(-EINVAL);
100
101 ptep = huge_pte_offset(mm, addr, HPAGE_SIZE);
102 if (!ptep || pte_none(*ptep))
103 return NULL;
104 page = pte_page(*ptep);
105 page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT);
106 return page;
107}
108int pmd_huge(pmd_t pmd)
109{
110 return 0;
111}
112
113int pud_huge(pud_t pud)
114{
115 return 0;
116}
117
118void hugetlb_free_pgd_range(struct mmu_gather *tlb,
119 unsigned long addr, unsigned long end,
120 unsigned long floor, unsigned long ceiling)
121{
122 /*
123 * This is called to free hugetlb page tables.
124 *
125 * The offset of these addresses from the base of the hugetlb
126 * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that
127 * the standard free_pgd_range will free the right page tables.
128 *
129 * If floor and ceiling are also in the hugetlb region, they
130 * must likewise be scaled down; but if outside, left unchanged.
131 */
132
133 addr = htlbpage_to_page(addr);
134 end = htlbpage_to_page(end);
135 if (REGION_NUMBER(floor) == RGN_HPAGE)
136 floor = htlbpage_to_page(floor);
137 if (REGION_NUMBER(ceiling) == RGN_HPAGE)
138 ceiling = htlbpage_to_page(ceiling);
139
140 free_pgd_range(tlb, addr, end, floor, ceiling);
141}
142
143unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
144 unsigned long pgoff, unsigned long flags)
145{
146 struct vm_unmapped_area_info info;
147
148 if (len > RGN_MAP_LIMIT)
149 return -ENOMEM;
150 if (len & ~HPAGE_MASK)
151 return -EINVAL;
152
153 /* Handle MAP_FIXED */
154 if (flags & MAP_FIXED) {
155 if (prepare_hugepage_range(file, addr, len))
156 return -EINVAL;
157 return addr;
158 }
159
160 /* This code assumes that RGN_HPAGE != 0. */
161 if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
162 addr = HPAGE_REGION_BASE;
163
164 info.flags = 0;
165 info.length = len;
166 info.low_limit = addr;
167 info.high_limit = HPAGE_REGION_BASE + RGN_MAP_LIMIT;
168 info.align_mask = PAGE_MASK & (HPAGE_SIZE - 1);
169 info.align_offset = 0;
170 return vm_unmapped_area(&info);
171}
172
173static int __init hugetlb_setup_sz(char *str)
174{
175 u64 tr_pages;
176 unsigned long long size;
177
178 if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0)
179 /*
180 * shouldn't happen, but just in case.
181 */
182 tr_pages = 0x15557000UL;
183
184 size = memparse(str, &str);
185 if (*str || !is_power_of_2(size) || !(tr_pages & size) ||
186 size <= PAGE_SIZE ||
187 size >= (1UL << PAGE_SHIFT << MAX_ORDER)) {
188 printk(KERN_WARNING "Invalid huge page size specified\n");
189 return 1;
190 }
191
192 hpage_shift = __ffs(size);
193 /*
194 * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT
195 * override here with new page shift.
196 */
197 ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2);
198 return 0;
199}
200early_param("hugepagesz", hugetlb_setup_sz);
1/*
2 * IA-64 Huge TLB Page Support for Kernel.
3 *
4 * Copyright (C) 2002-2004 Rohit Seth <rohit.seth@intel.com>
5 * Copyright (C) 2003-2004 Ken Chen <kenneth.w.chen@intel.com>
6 *
7 * Sep, 2003: add numa support
8 * Feb, 2004: dynamic hugetlb page size via boot parameter
9 */
10
11#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/mm.h>
14#include <linux/hugetlb.h>
15#include <linux/pagemap.h>
16#include <linux/module.h>
17#include <linux/sysctl.h>
18#include <linux/log2.h>
19#include <asm/mman.h>
20#include <asm/pgalloc.h>
21#include <asm/tlb.h>
22#include <asm/tlbflush.h>
23
24unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT;
25EXPORT_SYMBOL(hpage_shift);
26
27pte_t *
28huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
29{
30 unsigned long taddr = htlbpage_to_page(addr);
31 pgd_t *pgd;
32 pud_t *pud;
33 pmd_t *pmd;
34 pte_t *pte = NULL;
35
36 pgd = pgd_offset(mm, taddr);
37 pud = pud_alloc(mm, pgd, taddr);
38 if (pud) {
39 pmd = pmd_alloc(mm, pud, taddr);
40 if (pmd)
41 pte = pte_alloc_map(mm, NULL, pmd, taddr);
42 }
43 return pte;
44}
45
46pte_t *
47huge_pte_offset (struct mm_struct *mm, unsigned long addr)
48{
49 unsigned long taddr = htlbpage_to_page(addr);
50 pgd_t *pgd;
51 pud_t *pud;
52 pmd_t *pmd;
53 pte_t *pte = NULL;
54
55 pgd = pgd_offset(mm, taddr);
56 if (pgd_present(*pgd)) {
57 pud = pud_offset(pgd, taddr);
58 if (pud_present(*pud)) {
59 pmd = pmd_offset(pud, taddr);
60 if (pmd_present(*pmd))
61 pte = pte_offset_map(pmd, taddr);
62 }
63 }
64
65 return pte;
66}
67
68int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
69{
70 return 0;
71}
72
73#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }
74
75/*
76 * Don't actually need to do any preparation, but need to make sure
77 * the address is in the right region.
78 */
79int prepare_hugepage_range(struct file *file,
80 unsigned long addr, unsigned long len)
81{
82 if (len & ~HPAGE_MASK)
83 return -EINVAL;
84 if (addr & ~HPAGE_MASK)
85 return -EINVAL;
86 if (REGION_NUMBER(addr) != RGN_HPAGE)
87 return -EINVAL;
88
89 return 0;
90}
91
92struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write)
93{
94 struct page *page;
95 pte_t *ptep;
96
97 if (REGION_NUMBER(addr) != RGN_HPAGE)
98 return ERR_PTR(-EINVAL);
99
100 ptep = huge_pte_offset(mm, addr);
101 if (!ptep || pte_none(*ptep))
102 return NULL;
103 page = pte_page(*ptep);
104 page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT);
105 return page;
106}
107int pmd_huge(pmd_t pmd)
108{
109 return 0;
110}
111
112int pud_huge(pud_t pud)
113{
114 return 0;
115}
116
117struct page *
118follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write)
119{
120 return NULL;
121}
122
123void hugetlb_free_pgd_range(struct mmu_gather *tlb,
124 unsigned long addr, unsigned long end,
125 unsigned long floor, unsigned long ceiling)
126{
127 /*
128 * This is called to free hugetlb page tables.
129 *
130 * The offset of these addresses from the base of the hugetlb
131 * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that
132 * the standard free_pgd_range will free the right page tables.
133 *
134 * If floor and ceiling are also in the hugetlb region, they
135 * must likewise be scaled down; but if outside, left unchanged.
136 */
137
138 addr = htlbpage_to_page(addr);
139 end = htlbpage_to_page(end);
140 if (REGION_NUMBER(floor) == RGN_HPAGE)
141 floor = htlbpage_to_page(floor);
142 if (REGION_NUMBER(ceiling) == RGN_HPAGE)
143 ceiling = htlbpage_to_page(ceiling);
144
145 free_pgd_range(tlb, addr, end, floor, ceiling);
146}
147
148unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
149 unsigned long pgoff, unsigned long flags)
150{
151 struct vm_area_struct *vmm;
152
153 if (len > RGN_MAP_LIMIT)
154 return -ENOMEM;
155 if (len & ~HPAGE_MASK)
156 return -EINVAL;
157
158 /* Handle MAP_FIXED */
159 if (flags & MAP_FIXED) {
160 if (prepare_hugepage_range(file, addr, len))
161 return -EINVAL;
162 return addr;
163 }
164
165 /* This code assumes that RGN_HPAGE != 0. */
166 if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
167 addr = HPAGE_REGION_BASE;
168 else
169 addr = ALIGN(addr, HPAGE_SIZE);
170 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
171 /* At this point: (!vmm || addr < vmm->vm_end). */
172 if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT)
173 return -ENOMEM;
174 if (!vmm || (addr + len) <= vmm->vm_start)
175 return addr;
176 addr = ALIGN(vmm->vm_end, HPAGE_SIZE);
177 }
178}
179
180static int __init hugetlb_setup_sz(char *str)
181{
182 u64 tr_pages;
183 unsigned long long size;
184
185 if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0)
186 /*
187 * shouldn't happen, but just in case.
188 */
189 tr_pages = 0x15557000UL;
190
191 size = memparse(str, &str);
192 if (*str || !is_power_of_2(size) || !(tr_pages & size) ||
193 size <= PAGE_SIZE ||
194 size >= (1UL << PAGE_SHIFT << MAX_ORDER)) {
195 printk(KERN_WARNING "Invalid huge page size specified\n");
196 return 1;
197 }
198
199 hpage_shift = __ffs(size);
200 /*
201 * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT
202 * override here with new page shift.
203 */
204 ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2);
205 return 0;
206}
207early_param("hugepagesz", hugetlb_setup_sz);