]>
Commit | Line | Data |
---|---|---|
cf13f0ea HC |
1 | /* |
2 | * arch/s390/kernel/machine_kexec.c | |
3 | * | |
60a0c68d | 4 | * Copyright IBM Corp. 2005,2011 |
cf13f0ea | 5 | * |
c6b5b847 HC |
6 | * Author(s): Rolf Adelsberger, |
7 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
60a0c68d | 8 | * Michael Holzheu <holzheu@linux.vnet.ibm.com> |
cf13f0ea HC |
9 | */ |
10 | ||
cf13f0ea HC |
11 | #include <linux/device.h> |
12 | #include <linux/mm.h> | |
13 | #include <linux/kexec.h> | |
14 | #include <linux/delay.h> | |
2b67fc46 | 15 | #include <linux/reboot.h> |
6966727d | 16 | #include <linux/ftrace.h> |
a386fba2 HC |
17 | #include <asm/cio.h> |
18 | #include <asm/setup.h> | |
cf13f0ea HC |
19 | #include <asm/pgtable.h> |
20 | #include <asm/pgalloc.h> | |
21 | #include <asm/system.h> | |
a386fba2 | 22 | #include <asm/smp.h> |
15e9b586 | 23 | #include <asm/reset.h> |
9c9c1761 | 24 | #include <asm/ipl.h> |
60a0c68d MH |
25 | #include <asm/diag.h> |
26 | #include <asm/asm-offsets.h> | |
cf13f0ea | 27 | |
c6b5b847 | 28 | typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long); |
cf13f0ea | 29 | |
2efe55a9 TK |
30 | extern const unsigned char relocate_kernel[]; |
31 | extern const unsigned long long relocate_kernel_len; | |
cf13f0ea | 32 | |
60a0c68d MH |
33 | #ifdef CONFIG_CRASH_DUMP |
34 | ||
35 | void *fill_cpu_elf_notes(void *ptr, struct save_area *sa); | |
36 | ||
37 | /* | |
38 | * Create ELF notes for one CPU | |
39 | */ | |
40 | static void add_elf_notes(int cpu) | |
41 | { | |
42 | struct save_area *sa = (void *) 4608 + store_prefix(); | |
43 | void *ptr; | |
44 | ||
45 | memcpy((void *) (4608UL + sa->pref_reg), sa, sizeof(*sa)); | |
46 | ptr = (u64 *) per_cpu_ptr(crash_notes, cpu); | |
47 | ptr = fill_cpu_elf_notes(ptr, sa); | |
48 | memset(ptr, 0, sizeof(struct elf_note)); | |
49 | } | |
50 | ||
60a0c68d MH |
51 | /* |
52 | * Initialize CPU ELF notes | |
53 | */ | |
54 | void setup_regs(void) | |
55 | { | |
56 | unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE; | |
8b646bd7 | 57 | int cpu, this_cpu; |
60a0c68d | 58 | |
8b646bd7 MS |
59 | this_cpu = smp_find_processor_id(stap()); |
60 | add_elf_notes(this_cpu); | |
60a0c68d | 61 | for_each_online_cpu(cpu) { |
8b646bd7 MS |
62 | if (cpu == this_cpu) |
63 | continue; | |
64 | if (smp_store_status(cpu)) | |
60a0c68d | 65 | continue; |
60a0c68d | 66 | add_elf_notes(cpu); |
60a0c68d MH |
67 | } |
68 | /* Copy dump CPU store status info to absolute zero */ | |
69 | memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area)); | |
70 | } | |
71 | ||
72 | #endif | |
73 | ||
74 | /* | |
75 | * Start kdump: We expect here that a store status has been done on our CPU | |
76 | */ | |
77 | static void __do_machine_kdump(void *image) | |
78 | { | |
79 | #ifdef CONFIG_CRASH_DUMP | |
80 | int (*start_kdump)(int) = (void *)((struct kimage *) image)->start; | |
81 | ||
b50511e4 | 82 | __load_psw_mask(PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA); |
60a0c68d MH |
83 | setup_regs(); |
84 | start_kdump(1); | |
85 | #endif | |
86 | } | |
87 | ||
88 | /* | |
89 | * Check if kdump checksums are valid: We call purgatory with parameter "0" | |
90 | */ | |
91 | static int kdump_csum_valid(struct kimage *image) | |
92 | { | |
93 | #ifdef CONFIG_CRASH_DUMP | |
94 | int (*start_kdump)(int) = (void *)image->start; | |
95 | int rc; | |
96 | ||
97 | __arch_local_irq_stnsm(0xfb); /* disable DAT */ | |
98 | rc = start_kdump(0); | |
99 | __arch_local_irq_stosm(0x04); /* enable DAT */ | |
100 | return rc ? 0 : -EINVAL; | |
101 | #else | |
102 | return -EINVAL; | |
103 | #endif | |
104 | } | |
105 | ||
dab7a7b1 MH |
106 | /* |
107 | * Map or unmap crashkernel memory | |
108 | */ | |
109 | static void crash_map_pages(int enable) | |
110 | { | |
111 | unsigned long size = resource_size(&crashk_res); | |
112 | ||
113 | BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN || | |
114 | size % KEXEC_CRASH_MEM_ALIGN); | |
115 | if (enable) | |
116 | vmem_add_mapping(crashk_res.start, size); | |
117 | else | |
118 | vmem_remove_mapping(crashk_res.start, size); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Map crashkernel memory | |
123 | */ | |
124 | void crash_map_reserved_pages(void) | |
125 | { | |
126 | crash_map_pages(1); | |
127 | } | |
128 | ||
129 | /* | |
130 | * Unmap crashkernel memory | |
131 | */ | |
132 | void crash_unmap_reserved_pages(void) | |
133 | { | |
134 | crash_map_pages(0); | |
135 | } | |
136 | ||
60a0c68d MH |
137 | /* |
138 | * Give back memory to hypervisor before new kdump is loaded | |
139 | */ | |
140 | static int machine_kexec_prepare_kdump(void) | |
141 | { | |
142 | #ifdef CONFIG_CRASH_DUMP | |
143 | if (MACHINE_IS_VM) | |
144 | diag10_range(PFN_DOWN(crashk_res.start), | |
145 | PFN_DOWN(crashk_res.end - crashk_res.start + 1)); | |
146 | return 0; | |
147 | #else | |
148 | return -EINVAL; | |
149 | #endif | |
150 | } | |
151 | ||
c6b5b847 | 152 | int machine_kexec_prepare(struct kimage *image) |
cf13f0ea | 153 | { |
c6b5b847 | 154 | void *reboot_code_buffer; |
cf13f0ea | 155 | |
9c9c1761 HC |
156 | /* Can't replace kernel image since it is read-only. */ |
157 | if (ipl_flags & IPL_NSS_VALID) | |
158 | return -ENOSYS; | |
159 | ||
60a0c68d MH |
160 | if (image->type == KEXEC_TYPE_CRASH) |
161 | return machine_kexec_prepare_kdump(); | |
162 | ||
cf13f0ea HC |
163 | /* We don't support anything but the default image type for now. */ |
164 | if (image->type != KEXEC_TYPE_DEFAULT) | |
165 | return -EINVAL; | |
166 | ||
167 | /* Get the destination where the assembler code should be copied to.*/ | |
c6b5b847 | 168 | reboot_code_buffer = (void *) page_to_phys(image->control_code_page); |
cf13f0ea HC |
169 | |
170 | /* Then copy it */ | |
c6b5b847 | 171 | memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len); |
cf13f0ea HC |
172 | return 0; |
173 | } | |
174 | ||
c6b5b847 | 175 | void machine_kexec_cleanup(struct kimage *image) |
cf13f0ea HC |
176 | { |
177 | } | |
178 | ||
60a0c68d MH |
179 | void arch_crash_save_vmcoreinfo(void) |
180 | { | |
181 | VMCOREINFO_SYMBOL(lowcore_ptr); | |
7fe7a18c | 182 | VMCOREINFO_SYMBOL(high_memory); |
60a0c68d MH |
183 | VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS); |
184 | } | |
185 | ||
c6b5b847 | 186 | void machine_shutdown(void) |
cf13f0ea | 187 | { |
cf13f0ea HC |
188 | } |
189 | ||
60a0c68d MH |
190 | /* |
191 | * Do normal kexec | |
192 | */ | |
193 | static void __do_machine_kexec(void *data) | |
cf13f0ea | 194 | { |
cf13f0ea | 195 | relocate_kernel_t data_mover; |
2c2df118 | 196 | struct kimage *image = data; |
cf13f0ea | 197 | |
c6b5b847 | 198 | data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page); |
cf13f0ea HC |
199 | |
200 | /* Call the moving routine */ | |
c6b5b847 | 201 | (*data_mover)(&image->head, image->start); |
cf13f0ea | 202 | } |
2c2df118 | 203 | |
60a0c68d MH |
204 | /* |
205 | * Reset system and call either kdump or normal kexec | |
206 | */ | |
207 | static void __machine_kexec(void *data) | |
208 | { | |
209 | struct kimage *image = data; | |
210 | ||
211 | pfault_fini(); | |
212 | if (image->type == KEXEC_TYPE_CRASH) | |
213 | s390_reset_system(__do_machine_kdump, data); | |
214 | else | |
215 | s390_reset_system(__do_machine_kexec, data); | |
216 | disabled_wait((unsigned long) __builtin_return_address(0)); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Do either kdump or normal kexec. In case of kdump we first ask | |
221 | * purgatory, if kdump checksums are valid. | |
222 | */ | |
2c2df118 HC |
223 | void machine_kexec(struct kimage *image) |
224 | { | |
60a0c68d MH |
225 | if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image)) |
226 | return; | |
6966727d | 227 | tracer_disable(); |
2c2df118 | 228 | smp_send_stop(); |
8b646bd7 | 229 | smp_call_ipl_cpu(__machine_kexec, image); |
2c2df118 | 230 | } |