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6b563d8c26
Move fill_cpu_elf_notes() prototype to header file. This way we get compile errors if e.g. the number of function parameters get changed. Otherwise it's possible to change just the definition and everything else still compiles fine, but the result is broken code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
242 lines
5.2 KiB
C
242 lines
5.2 KiB
C
/*
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* Copyright IBM Corp. 2005, 2011
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*
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* Author(s): Rolf Adelsberger,
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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* Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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#include <linux/device.h>
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/ftrace.h>
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#include <linux/debug_locks.h>
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#include <asm/cio.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/smp.h>
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#include <asm/reset.h>
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#include <asm/ipl.h>
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#include <asm/diag.h>
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#include <asm/elf.h>
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#include <asm/asm-offsets.h>
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#include <asm/os_info.h>
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typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
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extern const unsigned char relocate_kernel[];
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extern const unsigned long long relocate_kernel_len;
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#ifdef CONFIG_CRASH_DUMP
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/*
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* Create ELF notes for one CPU
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*/
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static void add_elf_notes(int cpu)
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{
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struct save_area *sa = (void *) 4608 + store_prefix();
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void *ptr;
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memcpy((void *) (4608UL + sa->pref_reg), sa, sizeof(*sa));
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ptr = (u64 *) per_cpu_ptr(crash_notes, cpu);
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ptr = fill_cpu_elf_notes(ptr, sa);
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memset(ptr, 0, sizeof(struct elf_note));
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}
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/*
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* Initialize CPU ELF notes
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*/
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void setup_regs(void)
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{
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unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE;
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int cpu, this_cpu;
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this_cpu = smp_find_processor_id(stap());
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add_elf_notes(this_cpu);
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for_each_online_cpu(cpu) {
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if (cpu == this_cpu)
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continue;
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if (smp_store_status(cpu))
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continue;
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add_elf_notes(cpu);
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}
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/* Copy dump CPU store status info to absolute zero */
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memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area));
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}
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#endif
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/*
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* Start kdump: We expect here that a store status has been done on our CPU
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*/
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static void __do_machine_kdump(void *image)
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{
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#ifdef CONFIG_CRASH_DUMP
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int (*start_kdump)(int) = (void *)((struct kimage *) image)->start;
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setup_regs();
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__load_psw_mask(PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA);
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start_kdump(1);
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#endif
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}
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/*
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* Check if kdump checksums are valid: We call purgatory with parameter "0"
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*/
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static int kdump_csum_valid(struct kimage *image)
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{
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#ifdef CONFIG_CRASH_DUMP
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int (*start_kdump)(int) = (void *)image->start;
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int rc;
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__arch_local_irq_stnsm(0xfb); /* disable DAT */
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rc = start_kdump(0);
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__arch_local_irq_stosm(0x04); /* enable DAT */
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return rc ? 0 : -EINVAL;
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#else
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return -EINVAL;
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#endif
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}
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/*
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* Map or unmap crashkernel memory
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*/
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static void crash_map_pages(int enable)
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{
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unsigned long size = resource_size(&crashk_res);
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BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN ||
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size % KEXEC_CRASH_MEM_ALIGN);
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if (enable)
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vmem_add_mapping(crashk_res.start, size);
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else {
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vmem_remove_mapping(crashk_res.start, size);
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if (size)
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os_info_crashkernel_add(crashk_res.start, size);
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else
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os_info_crashkernel_add(0, 0);
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}
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}
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/*
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* Map crashkernel memory
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*/
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void crash_map_reserved_pages(void)
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{
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crash_map_pages(1);
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}
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/*
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* Unmap crashkernel memory
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*/
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void crash_unmap_reserved_pages(void)
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{
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crash_map_pages(0);
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}
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/*
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* Give back memory to hypervisor before new kdump is loaded
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*/
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static int machine_kexec_prepare_kdump(void)
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{
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#ifdef CONFIG_CRASH_DUMP
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if (MACHINE_IS_VM)
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diag10_range(PFN_DOWN(crashk_res.start),
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PFN_DOWN(crashk_res.end - crashk_res.start + 1));
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return 0;
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#else
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return -EINVAL;
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#endif
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}
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int machine_kexec_prepare(struct kimage *image)
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{
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void *reboot_code_buffer;
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/* Can't replace kernel image since it is read-only. */
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if (ipl_flags & IPL_NSS_VALID)
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return -EOPNOTSUPP;
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if (image->type == KEXEC_TYPE_CRASH)
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return machine_kexec_prepare_kdump();
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/* We don't support anything but the default image type for now. */
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if (image->type != KEXEC_TYPE_DEFAULT)
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return -EINVAL;
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/* Get the destination where the assembler code should be copied to.*/
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reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
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/* Then copy it */
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memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
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return 0;
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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}
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void arch_crash_save_vmcoreinfo(void)
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{
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VMCOREINFO_SYMBOL(lowcore_ptr);
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VMCOREINFO_SYMBOL(high_memory);
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VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS);
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}
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void machine_shutdown(void)
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{
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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}
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/*
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* Do normal kexec
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*/
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static void __do_machine_kexec(void *data)
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{
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relocate_kernel_t data_mover;
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struct kimage *image = data;
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data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
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/* Call the moving routine */
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(*data_mover)(&image->head, image->start);
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}
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/*
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* Reset system and call either kdump or normal kexec
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*/
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static void __machine_kexec(void *data)
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{
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struct kimage *image = data;
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__arch_local_irq_stosm(0x04); /* enable DAT */
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pfault_fini();
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tracing_off();
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debug_locks_off();
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if (image->type == KEXEC_TYPE_CRASH) {
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lgr_info_log();
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s390_reset_system(__do_machine_kdump, data);
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} else {
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s390_reset_system(__do_machine_kexec, data);
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}
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disabled_wait((unsigned long) __builtin_return_address(0));
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}
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/*
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* Do either kdump or normal kexec. In case of kdump we first ask
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* purgatory, if kdump checksums are valid.
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*/
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void machine_kexec(struct kimage *image)
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{
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if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image))
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return;
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tracer_disable();
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smp_send_stop();
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smp_call_ipl_cpu(__machine_kexec, image);
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}
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