2 * Copyright IBM Corp. 2005, 2011
4 * Author(s): Rolf Adelsberger,
5 * Heiko Carstens <heiko.carstens@de.ibm.com>
6 * Michael Holzheu <holzheu@linux.vnet.ibm.com>
9 #include <linux/device.h>
11 #include <linux/kexec.h>
12 #include <linux/delay.h>
13 #include <linux/reboot.h>
14 #include <linux/ftrace.h>
15 #include <linux/debug_locks.h>
17 #include <asm/setup.h>
18 #include <asm/pgtable.h>
19 #include <asm/pgalloc.h>
21 #include <asm/reset.h>
24 #include <asm/asm-offsets.h>
25 #include <asm/os_info.h>
27 typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
29 extern const unsigned char relocate_kernel[];
30 extern const unsigned long long relocate_kernel_len;
32 #ifdef CONFIG_CRASH_DUMP
34 void *fill_cpu_elf_notes(void *ptr, struct save_area *sa);
37 * Create ELF notes for one CPU
39 static void add_elf_notes(int cpu)
41 struct save_area *sa = (void *) 4608 + store_prefix();
44 memcpy((void *) (4608UL + sa->pref_reg), sa, sizeof(*sa));
45 ptr = (u64 *) per_cpu_ptr(crash_notes, cpu);
46 ptr = fill_cpu_elf_notes(ptr, sa);
47 memset(ptr, 0, sizeof(struct elf_note));
51 * Initialize CPU ELF notes
55 unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE;
58 this_cpu = smp_find_processor_id(stap());
59 add_elf_notes(this_cpu);
60 for_each_online_cpu(cpu) {
63 if (smp_store_status(cpu))
67 /* Copy dump CPU store status info to absolute zero */
68 memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area));
74 * Start kdump: We expect here that a store status has been done on our CPU
76 static void __do_machine_kdump(void *image)
78 #ifdef CONFIG_CRASH_DUMP
79 int (*start_kdump)(int) = (void *)((struct kimage *) image)->start;
82 __load_psw_mask(PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA);
88 * Check if kdump checksums are valid: We call purgatory with parameter "0"
90 static int kdump_csum_valid(struct kimage *image)
92 #ifdef CONFIG_CRASH_DUMP
93 int (*start_kdump)(int) = (void *)image->start;
96 __arch_local_irq_stnsm(0xfb); /* disable DAT */
98 __arch_local_irq_stosm(0x04); /* enable DAT */
99 return rc ? 0 : -EINVAL;
106 * Map or unmap crashkernel memory
108 static void crash_map_pages(int enable)
110 unsigned long size = resource_size(&crashk_res);
112 BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN ||
113 size % KEXEC_CRASH_MEM_ALIGN);
115 vmem_add_mapping(crashk_res.start, size);
117 vmem_remove_mapping(crashk_res.start, size);
119 os_info_crashkernel_add(crashk_res.start, size);
121 os_info_crashkernel_add(0, 0);
126 * Map crashkernel memory
128 void crash_map_reserved_pages(void)
134 * Unmap crashkernel memory
136 void crash_unmap_reserved_pages(void)
142 * Give back memory to hypervisor before new kdump is loaded
144 static int machine_kexec_prepare_kdump(void)
146 #ifdef CONFIG_CRASH_DUMP
148 diag10_range(PFN_DOWN(crashk_res.start),
149 PFN_DOWN(crashk_res.end - crashk_res.start + 1));
156 int machine_kexec_prepare(struct kimage *image)
158 void *reboot_code_buffer;
160 /* Can't replace kernel image since it is read-only. */
161 if (ipl_flags & IPL_NSS_VALID)
164 if (image->type == KEXEC_TYPE_CRASH)
165 return machine_kexec_prepare_kdump();
167 /* We don't support anything but the default image type for now. */
168 if (image->type != KEXEC_TYPE_DEFAULT)
171 /* Get the destination where the assembler code should be copied to.*/
172 reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
175 memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
179 void machine_kexec_cleanup(struct kimage *image)
183 void arch_crash_save_vmcoreinfo(void)
185 VMCOREINFO_SYMBOL(lowcore_ptr);
186 VMCOREINFO_SYMBOL(high_memory);
187 VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS);
190 void machine_shutdown(void)
197 static void __do_machine_kexec(void *data)
199 relocate_kernel_t data_mover;
200 struct kimage *image = data;
202 data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
204 /* Call the moving routine */
205 (*data_mover)(&image->head, image->start);
209 * Reset system and call either kdump or normal kexec
211 static void __machine_kexec(void *data)
213 struct kimage *image = data;
215 __arch_local_irq_stosm(0x04); /* enable DAT */
219 if (image->type == KEXEC_TYPE_CRASH) {
221 s390_reset_system(__do_machine_kdump, data);
223 s390_reset_system(__do_machine_kexec, data);
225 disabled_wait((unsigned long) __builtin_return_address(0));
229 * Do either kdump or normal kexec. In case of kdump we first ask
230 * purgatory, if kdump checksums are valid.
232 void machine_kexec(struct kimage *image)
234 if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image))
238 smp_call_ipl_cpu(__machine_kexec, image);