1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Hibernation support for x86
4 *
5 * Copyright (c) 2007 Rafael J. Wysocki <rjw@s
6 * Copyright (c) 2002 Pavel Machek <pavel@ucw.
7 * Copyright (c) 2001 Patrick Mochel <mochel@o
8 */
9 #include <linux/gfp.h>
10 #include <linux/smp.h>
11 #include <linux/suspend.h>
12 #include <linux/scatterlist.h>
13 #include <linux/kdebug.h>
14 #include <linux/cpu.h>
15 #include <linux/pgtable.h>
16 #include <linux/types.h>
17 #include <linux/crc32.h>
18
19 #include <asm/e820/api.h>
20 #include <asm/init.h>
21 #include <asm/proto.h>
22 #include <asm/page.h>
23 #include <asm/mtrr.h>
24 #include <asm/sections.h>
25 #include <asm/suspend.h>
26 #include <asm/tlbflush.h>
27
28 /*
29 * Address to jump to in the last phase of res
30 * kernel's text (this value is passed in the
31 */
32 unsigned long restore_jump_address __visible;
33 unsigned long jump_address_phys;
34
35 /*
36 * Value of the cr3 register from before the h
37 * in the image header).
38 */
39 unsigned long restore_cr3 __visible;
40 unsigned long temp_pgt __visible;
41 unsigned long relocated_restore_code __visible
42
43 /**
44 * pfn_is_nosave - check if given pfn is
45 */
46 int pfn_is_nosave(unsigned long pfn)
47 {
48 unsigned long nosave_begin_pfn;
49 unsigned long nosave_end_pfn;
50
51 nosave_begin_pfn = __pa_symbol(&__nosa
52 nosave_end_pfn = PAGE_ALIGN(__pa_symbo
53
54 return pfn >= nosave_begin_pfn && pfn
55 }
56
57 struct restore_data_record {
58 unsigned long jump_address;
59 unsigned long jump_address_phys;
60 unsigned long cr3;
61 unsigned long magic;
62 unsigned long e820_checksum;
63 };
64
65 /**
66 * compute_e820_crc32 - calculate crc32 of a g
67 *
68 * @table: the e820 table to be calculated
69 *
70 * Return: the resulting checksum
71 */
72 static inline u32 compute_e820_crc32(struct e8
73 {
74 int size = offsetof(struct e820_table,
75 sizeof(struct e820_entry) * ta
76
77 return ~crc32_le(~0, (unsigned char co
78 }
79
80 #ifdef CONFIG_X86_64
81 #define RESTORE_MAGIC 0x23456789ABCDEF02UL
82 #else
83 #define RESTORE_MAGIC 0x12345679UL
84 #endif
85
86 /**
87 * arch_hibernation_header_save - populat
88 * of a hibernation image header
89 * @addr: address to save the data at
90 */
91 int arch_hibernation_header_save(void *addr, u
92 {
93 struct restore_data_record *rdr = addr
94
95 if (max_size < sizeof(struct restore_d
96 return -EOVERFLOW;
97 rdr->magic = RESTORE_MAGIC;
98 rdr->jump_address = (unsigned long)res
99 rdr->jump_address_phys = __pa_symbol(r
100
101 /*
102 * The restore code fixes up CR3 and C
103 *
104 * [in hibernation asm]
105 * 1. CR3 <= temporary page tables
106 * 2. CR4 <= mmu_cr4_features (from th
107 * 3. CR3 <= rdr->cr3
108 * 4. CR4 <= mmu_cr4_features (from us
109 * [in restore_processor_state()]
110 * 5. CR4 <= saved CR4
111 * 6. CR3 <= saved CR3
112 *
113 * Our mmu_cr4_features has CR4.PCIDE=
114 * CR4.PCIDE while CR3's PCID bits are
115 * rdr->cr3 needs to point to valid pa
116 * have any of the PCID bits set.
117 */
118 rdr->cr3 = restore_cr3 & ~CR3_PCID_MAS
119
120 rdr->e820_checksum = compute_e820_crc3
121 return 0;
122 }
123
124 /**
125 * arch_hibernation_header_restore - read
126 * from the hibernation image hea
127 * @addr: address to read the data from
128 */
129 int arch_hibernation_header_restore(void *addr
130 {
131 struct restore_data_record *rdr = addr
132
133 if (rdr->magic != RESTORE_MAGIC) {
134 pr_crit("Unrecognized hibernat
135 return -EINVAL;
136 }
137
138 restore_jump_address = rdr->jump_addre
139 jump_address_phys = rdr->jump_address_
140 restore_cr3 = rdr->cr3;
141
142 if (rdr->e820_checksum != compute_e820
143 pr_crit("Hibernate inconsisten
144 return -ENODEV;
145 }
146
147 return 0;
148 }
149
150 int relocate_restore_code(void)
151 {
152 pgd_t *pgd;
153 p4d_t *p4d;
154 pud_t *pud;
155 pmd_t *pmd;
156 pte_t *pte;
157
158 relocated_restore_code = get_safe_page
159 if (!relocated_restore_code)
160 return -ENOMEM;
161
162 __memcpy((void *)relocated_restore_cod
163
164 /* Make the page containing the reloca
165 pgd = (pgd_t *)__va(read_cr3_pa()) +
166 pgd_index(relocated_restore_co
167 p4d = p4d_offset(pgd, relocated_restor
168 if (p4d_leaf(*p4d)) {
169 set_p4d(p4d, __p4d(p4d_val(*p4
170 goto out;
171 }
172 pud = pud_offset(p4d, relocated_restor
173 if (pud_leaf(*pud)) {
174 set_pud(pud, __pud(pud_val(*pu
175 goto out;
176 }
177 pmd = pmd_offset(pud, relocated_restor
178 if (pmd_leaf(*pmd)) {
179 set_pmd(pmd, __pmd(pmd_val(*pm
180 goto out;
181 }
182 pte = pte_offset_kernel(pmd, relocated
183 set_pte(pte, __pte(pte_val(*pte) & ~_P
184 out:
185 __flush_tlb_all();
186 return 0;
187 }
188
189 int arch_resume_nosmt(void)
190 {
191 int ret = 0;
192 /*
193 * We reached this while coming out of
194 * that SMT siblings are sleeping in h
195 * against control transition during r
196 * hibernate_resume_nonboot_cpu_disabl
197 *
198 * If the resumed kernel has SMT disab
199 * SMT siblings out of hlt, and offlin
200 * end up in mwait proper.
201 *
202 * Called with hotplug disabled.
203 */
204 cpu_hotplug_enable();
205 if (cpu_smt_control == CPU_SMT_DISABLE
206 cpu_smt_control == CPU
207 enum cpuhp_smt_control old = c
208
209 ret = cpuhp_smt_enable();
210 if (ret)
211 goto out;
212 ret = cpuhp_smt_disable(old);
213 if (ret)
214 goto out;
215 }
216 out:
217 cpu_hotplug_disable();
218 return ret;
219 }
220
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