Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cf13f0ea | 2 | /* |
a53c8fab | 3 | * Copyright IBM Corp. 2005, 2011 |
cf13f0ea | 4 | * |
c6b5b847 HC |
5 | * Author(s): Rolf Adelsberger, |
6 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
60a0c68d | 7 | * Michael Holzheu <holzheu@linux.vnet.ibm.com> |
cf13f0ea HC |
8 | */ |
9 | ||
cf13f0ea HC |
10 | #include <linux/device.h> |
11 | #include <linux/mm.h> | |
12 | #include <linux/kexec.h> | |
13 | #include <linux/delay.h> | |
2b67fc46 | 14 | #include <linux/reboot.h> |
6966727d | 15 | #include <linux/ftrace.h> |
3ab121ab | 16 | #include <linux/debug_locks.h> |
b66ac63e | 17 | #include <linux/suspend.h> |
a386fba2 HC |
18 | #include <asm/cio.h> |
19 | #include <asm/setup.h> | |
cf13f0ea HC |
20 | #include <asm/pgtable.h> |
21 | #include <asm/pgalloc.h> | |
a386fba2 | 22 | #include <asm/smp.h> |
9c9c1761 | 23 | #include <asm/ipl.h> |
60a0c68d | 24 | #include <asm/diag.h> |
6b563d8c | 25 | #include <asm/elf.h> |
60a0c68d | 26 | #include <asm/asm-offsets.h> |
4e042af4 | 27 | #include <asm/cacheflush.h> |
a9fbf1a5 | 28 | #include <asm/os_info.h> |
e6c7c630 | 29 | #include <asm/set_memory.h> |
a62bc073 | 30 | #include <asm/switch_to.h> |
916cda1a | 31 | #include <asm/nmi.h> |
cf13f0ea | 32 | |
c6b5b847 | 33 | typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long); |
cf13f0ea | 34 | |
2efe55a9 TK |
35 | extern const unsigned char relocate_kernel[]; |
36 | extern const unsigned long long relocate_kernel_len; | |
cf13f0ea | 37 | |
60a0c68d MH |
38 | #ifdef CONFIG_CRASH_DUMP |
39 | ||
b66ac63e MH |
40 | /* |
41 | * PM notifier callback for kdump | |
42 | */ | |
43 | static int machine_kdump_pm_cb(struct notifier_block *nb, unsigned long action, | |
44 | void *ptr) | |
45 | { | |
46 | switch (action) { | |
47 | case PM_SUSPEND_PREPARE: | |
48 | case PM_HIBERNATION_PREPARE: | |
7a0058ec XP |
49 | if (kexec_crash_image) |
50 | arch_kexec_unprotect_crashkres(); | |
b66ac63e MH |
51 | break; |
52 | case PM_POST_SUSPEND: | |
53 | case PM_POST_HIBERNATION: | |
7a0058ec XP |
54 | if (kexec_crash_image) |
55 | arch_kexec_protect_crashkres(); | |
b66ac63e MH |
56 | break; |
57 | default: | |
58 | return NOTIFY_DONE; | |
59 | } | |
60 | return NOTIFY_OK; | |
61 | } | |
62 | ||
63 | static int __init machine_kdump_pm_init(void) | |
64 | { | |
65 | pm_notifier(machine_kdump_pm_cb, 0); | |
66 | return 0; | |
67 | } | |
68 | arch_initcall(machine_kdump_pm_init); | |
60a0c68d MH |
69 | |
70 | /* | |
1a36a39e MS |
71 | * Reset the system, copy boot CPU registers to absolute zero, |
72 | * and jump to the kdump image | |
60a0c68d MH |
73 | */ |
74 | static void __do_machine_kdump(void *image) | |
75 | { | |
1a36a39e MS |
76 | int (*start_kdump)(int); |
77 | unsigned long prefix; | |
78 | ||
79 | /* store_status() saved the prefix register to lowcore */ | |
80 | prefix = (unsigned long) S390_lowcore.prefixreg_save_area; | |
81 | ||
82 | /* Now do the reset */ | |
83 | s390_reset_system(); | |
84 | ||
85 | /* | |
86 | * Copy dump CPU store status info to absolute zero. | |
87 | * This need to be done *after* s390_reset_system set the | |
88 | * prefix register of this CPU to zero | |
89 | */ | |
90 | memcpy((void *) __LC_FPREGS_SAVE_AREA, | |
91 | (void *)(prefix + __LC_FPREGS_SAVE_AREA), 512); | |
60a0c68d | 92 | |
fa7c0043 | 93 | __load_psw_mask(PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA); |
1a36a39e | 94 | start_kdump = (void *)((struct kimage *) image)->start; |
60a0c68d | 95 | start_kdump(1); |
1a36a39e MS |
96 | |
97 | /* Die if start_kdump returns */ | |
98 | disabled_wait((unsigned long) __builtin_return_address(0)); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Start kdump: create a LGR log entry, store status of all CPUs and | |
103 | * branch to __do_machine_kdump. | |
104 | */ | |
105 | static noinline void __machine_kdump(void *image) | |
106 | { | |
916cda1a | 107 | struct mcesa *mcesa; |
ad3bc0ac | 108 | union ctlreg2 cr2_old, cr2_new; |
1a36a39e MS |
109 | int this_cpu, cpu; |
110 | ||
111 | lgr_info_log(); | |
112 | /* Get status of the other CPUs */ | |
113 | this_cpu = smp_find_processor_id(stap()); | |
114 | for_each_online_cpu(cpu) { | |
115 | if (cpu == this_cpu) | |
116 | continue; | |
117 | if (smp_store_status(cpu)) | |
118 | continue; | |
119 | } | |
120 | /* Store status of the boot CPU */ | |
916cda1a | 121 | mcesa = (struct mcesa *)(S390_lowcore.mcesad & MCESA_ORIGIN_MASK); |
1a36a39e | 122 | if (MACHINE_HAS_VX) |
916cda1a MS |
123 | save_vx_regs((__vector128 *) mcesa->vector_save_area); |
124 | if (MACHINE_HAS_GS) { | |
ad3bc0ac MS |
125 | __ctl_store(cr2_old.val, 2, 2); |
126 | cr2_new = cr2_old; | |
127 | cr2_new.gse = 1; | |
128 | __ctl_load(cr2_new.val, 2, 2); | |
916cda1a | 129 | save_gs_cb((struct gs_cb *) mcesa->guarded_storage_save_area); |
ad3bc0ac | 130 | __ctl_load(cr2_old.val, 2, 2); |
916cda1a | 131 | } |
1a36a39e MS |
132 | /* |
133 | * To create a good backchain for this CPU in the dump store_status | |
134 | * is passed the address of a function. The address is saved into | |
135 | * the PSW save area of the boot CPU and the function is invoked as | |
136 | * a tail call of store_status. The backchain in the dump will look | |
137 | * like this: | |
138 | * restart_int_handler -> __machine_kexec -> __do_machine_kdump | |
139 | * The call to store_status() will not return. | |
140 | */ | |
141 | store_status(__do_machine_kdump, image); | |
60a0c68d | 142 | } |
10ad34bc | 143 | #endif |
60a0c68d MH |
144 | |
145 | /* | |
146 | * Check if kdump checksums are valid: We call purgatory with parameter "0" | |
147 | */ | |
7c3eaaa3 | 148 | static bool kdump_csum_valid(struct kimage *image) |
60a0c68d MH |
149 | { |
150 | #ifdef CONFIG_CRASH_DUMP | |
151 | int (*start_kdump)(int) = (void *)image->start; | |
152 | int rc; | |
153 | ||
154 | __arch_local_irq_stnsm(0xfb); /* disable DAT */ | |
155 | rc = start_kdump(0); | |
156 | __arch_local_irq_stosm(0x04); /* enable DAT */ | |
7c3eaaa3 | 157 | return rc == 0; |
60a0c68d | 158 | #else |
7c3eaaa3 | 159 | return false; |
60a0c68d MH |
160 | #endif |
161 | } | |
162 | ||
7a0058ec XP |
163 | #ifdef CONFIG_CRASH_DUMP |
164 | ||
2d0af224 HC |
165 | void crash_free_reserved_phys_range(unsigned long begin, unsigned long end) |
166 | { | |
167 | unsigned long addr, size; | |
168 | ||
169 | for (addr = begin; addr < end; addr += PAGE_SIZE) | |
170 | free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT)); | |
171 | size = begin - crashk_res.start; | |
172 | if (size) | |
173 | os_info_crashkernel_add(crashk_res.start, size); | |
174 | else | |
175 | os_info_crashkernel_add(0, 0); | |
176 | } | |
177 | ||
4e042af4 | 178 | static void crash_protect_pages(int protect) |
dab7a7b1 | 179 | { |
4e042af4 | 180 | unsigned long size; |
dab7a7b1 | 181 | |
4e042af4 HC |
182 | if (!crashk_res.end) |
183 | return; | |
184 | size = resource_size(&crashk_res); | |
185 | if (protect) | |
186 | set_memory_ro(crashk_res.start, size >> PAGE_SHIFT); | |
2d0af224 | 187 | else |
4e042af4 | 188 | set_memory_rw(crashk_res.start, size >> PAGE_SHIFT); |
dab7a7b1 MH |
189 | } |
190 | ||
7a0058ec | 191 | void arch_kexec_protect_crashkres(void) |
dab7a7b1 | 192 | { |
4e042af4 | 193 | crash_protect_pages(1); |
dab7a7b1 MH |
194 | } |
195 | ||
7a0058ec | 196 | void arch_kexec_unprotect_crashkres(void) |
dab7a7b1 | 197 | { |
4e042af4 | 198 | crash_protect_pages(0); |
dab7a7b1 MH |
199 | } |
200 | ||
7a0058ec XP |
201 | #endif |
202 | ||
60a0c68d MH |
203 | /* |
204 | * Give back memory to hypervisor before new kdump is loaded | |
205 | */ | |
206 | static int machine_kexec_prepare_kdump(void) | |
207 | { | |
208 | #ifdef CONFIG_CRASH_DUMP | |
209 | if (MACHINE_IS_VM) | |
210 | diag10_range(PFN_DOWN(crashk_res.start), | |
211 | PFN_DOWN(crashk_res.end - crashk_res.start + 1)); | |
212 | return 0; | |
213 | #else | |
214 | return -EINVAL; | |
215 | #endif | |
216 | } | |
217 | ||
c6b5b847 | 218 | int machine_kexec_prepare(struct kimage *image) |
cf13f0ea | 219 | { |
c6b5b847 | 220 | void *reboot_code_buffer; |
cf13f0ea | 221 | |
60a0c68d MH |
222 | if (image->type == KEXEC_TYPE_CRASH) |
223 | return machine_kexec_prepare_kdump(); | |
224 | ||
cf13f0ea HC |
225 | /* We don't support anything but the default image type for now. */ |
226 | if (image->type != KEXEC_TYPE_DEFAULT) | |
227 | return -EINVAL; | |
228 | ||
229 | /* Get the destination where the assembler code should be copied to.*/ | |
c6b5b847 | 230 | reboot_code_buffer = (void *) page_to_phys(image->control_code_page); |
cf13f0ea HC |
231 | |
232 | /* Then copy it */ | |
c6b5b847 | 233 | memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len); |
cf13f0ea HC |
234 | return 0; |
235 | } | |
236 | ||
c6b5b847 | 237 | void machine_kexec_cleanup(struct kimage *image) |
cf13f0ea HC |
238 | { |
239 | } | |
240 | ||
60a0c68d MH |
241 | void arch_crash_save_vmcoreinfo(void) |
242 | { | |
243 | VMCOREINFO_SYMBOL(lowcore_ptr); | |
7fe7a18c | 244 | VMCOREINFO_SYMBOL(high_memory); |
60a0c68d | 245 | VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS); |
203e9e41 | 246 | mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); |
60a0c68d MH |
247 | } |
248 | ||
c6b5b847 | 249 | void machine_shutdown(void) |
cf13f0ea | 250 | { |
cf13f0ea HC |
251 | } |
252 | ||
48a8ca03 HC |
253 | void machine_crash_shutdown(struct pt_regs *regs) |
254 | { | |
3b967847 | 255 | set_os_info_reipl_block(); |
48a8ca03 HC |
256 | } |
257 | ||
60a0c68d MH |
258 | /* |
259 | * Do normal kexec | |
260 | */ | |
261 | static void __do_machine_kexec(void *data) | |
cf13f0ea | 262 | { |
cf13f0ea | 263 | relocate_kernel_t data_mover; |
2c2df118 | 264 | struct kimage *image = data; |
cf13f0ea | 265 | |
1a36a39e | 266 | s390_reset_system(); |
c6b5b847 | 267 | data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page); |
cf13f0ea | 268 | |
d0e810ee | 269 | __arch_local_irq_stnsm(0xfb); /* disable DAT - avoid no-execute */ |
cf13f0ea | 270 | /* Call the moving routine */ |
c6b5b847 | 271 | (*data_mover)(&image->head, image->start); |
1a36a39e MS |
272 | |
273 | /* Die if kexec returns */ | |
274 | disabled_wait((unsigned long) __builtin_return_address(0)); | |
cf13f0ea | 275 | } |
2c2df118 | 276 | |
60a0c68d MH |
277 | /* |
278 | * Reset system and call either kdump or normal kexec | |
279 | */ | |
280 | static void __machine_kexec(void *data) | |
281 | { | |
fa7c0043 | 282 | __arch_local_irq_stosm(0x04); /* enable DAT */ |
60a0c68d | 283 | pfault_fini(); |
3ab121ab MH |
284 | tracing_off(); |
285 | debug_locks_off(); | |
10ad34bc | 286 | #ifdef CONFIG_CRASH_DUMP |
1a36a39e MS |
287 | if (((struct kimage *) data)->type == KEXEC_TYPE_CRASH) |
288 | __machine_kdump(data); | |
10ad34bc | 289 | #endif |
1a36a39e | 290 | __do_machine_kexec(data); |
60a0c68d MH |
291 | } |
292 | ||
293 | /* | |
294 | * Do either kdump or normal kexec. In case of kdump we first ask | |
295 | * purgatory, if kdump checksums are valid. | |
296 | */ | |
2c2df118 HC |
297 | void machine_kexec(struct kimage *image) |
298 | { | |
60a0c68d MH |
299 | if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image)) |
300 | return; | |
6966727d | 301 | tracer_disable(); |
2c2df118 | 302 | smp_send_stop(); |
8b646bd7 | 303 | smp_call_ipl_cpu(__machine_kexec, image); |
2c2df118 | 304 | } |