current kernel, and to start another kernel. It is like a reboot
but is independent of hardware/microcode support.
+config CRASH_DUMP
+ bool "kernel crash dumps"
+ depends on 64BIT
+ help
+ Generate crash dump after being started by kexec.
+ Crash dump kernels are loaded in the main kernel with kexec-tools
+ into a specially reserved region and then later executed after
+ a crash by kdump/kexec.
+ For more details see Documentation/kdump/kdump.txt
+
config ZFCPDUMP
def_bool n
prompt "zfcpdump support"
extern int diag308(unsigned long subcode, void *addr);
extern void diag308_reset(void);
+extern void store_status(void);
#endif /* _ASM_S390_IPL_H */
/* Not more than 2GB */
#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
+/* Maximum address we can use for the crash control pages */
+#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
+
/* Allocate one page for the pdp and the second for the code */
#define KEXEC_CONTROL_PAGE_SIZE 4096
extern void register_reset_call(struct reset_call *reset);
extern void unregister_reset_call(struct reset_call *reset);
-extern void s390_reset_system(void);
+extern void s390_reset_system(void (*func)(void *), void *data);
#endif /* _ASM_S390_RESET_H */
#define IPL_DEVICE (*(unsigned long *) (0x10404))
#define INITRD_START (*(unsigned long *) (0x1040C))
#define INITRD_SIZE (*(unsigned long *) (0x10414))
+#define OLDMEM_BASE (*(unsigned long *) (0x1041C))
+#define OLDMEM_SIZE (*(unsigned long *) (0x10424))
#else /* __s390x__ */
#define IPL_DEVICE (*(unsigned long *) (0x10400))
#define INITRD_START (*(unsigned long *) (0x10408))
#define INITRD_SIZE (*(unsigned long *) (0x10410))
+#define OLDMEM_BASE (*(unsigned long *) (0x10418))
+#define OLDMEM_SIZE (*(unsigned long *) (0x10420))
#endif /* __s390x__ */
#define COMMAND_LINE ((char *) (0x10480))
#define CHUNK_READ_WRITE 0
#define CHUNK_READ_ONLY 1
+#define CHUNK_OLDMEM 4
+#define CHUNK_CRASHK 5
struct mem_chunk {
unsigned long addr;
extern unsigned long memory_end;
void detect_memory_layout(struct mem_chunk chunk[]);
+void create_mem_hole(struct mem_chunk memory_chunk[], unsigned long addr,
+ unsigned long size, int type);
#define PRIMARY_SPACE_MODE 0
#define ACCESS_REGISTER_MODE 1
#endif /* __s390x__ */
#define ZFCPDUMP_HSA_SIZE (32UL<<20)
+#define ZFCPDUMP_HSA_SIZE_MAX (64UL<<20)
/*
* Console mode. Override with conmode=
#define IPL_DEVICE 0x10404
#define INITRD_START 0x1040C
#define INITRD_SIZE 0x10414
+#define OLDMEM_BASE 0x1041C
+#define OLDMEM_SIZE 0x10424
#else /* __s390x__ */
#define IPL_DEVICE 0x10400
#define INITRD_START 0x10408
#define INITRD_SIZE 0x10410
+#define OLDMEM_BASE 0x10418
+#define OLDMEM_SIZE 0x10420
#endif /* __s390x__ */
#define COMMAND_LINE 0x10480
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
+obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
# Kexec part
S390_KEXEC_OBJS := machine_kexec.o crash.o
ENTRY(diag308_reset)
larl %r4,.Lctlregs # Save control registers
stctg %c0,%c15,0(%r4)
+ larl %r4,.Lfpctl # Floating point control register
+ stfpc 0(%r4)
larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
lghi %r3,0
lg %r4,0(%r4) # Save PSW
sam64 # Switch to 64 bit addressing mode
larl %r4,.Lctlregs # Restore control registers
lctlg %c0,%c15,0(%r4)
+ larl %r4,.Lfpctl # Restore floating point ctl register
+ lfpc 0(%r4)
br %r14
.align 16
.Lrestart_psw:
.rept 16
.quad 0
.endr
+.Lfpctl:
+ .long 0
.previous
#else /* CONFIG_64BIT */
--- /dev/null
+/*
+ * S390 kdump implementation
+ *
+ * Copyright IBM Corp. 2011
+ * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#include <linux/crash_dump.h>
+#include <asm/lowcore.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/crash_dump.h>
+#include <linux/bootmem.h>
+#include <linux/elf.h>
+#include <asm/ipl.h>
+
+#define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
+#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
+#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
+
+/*
+ * Copy one page from "oldmem"
+ *
+ * For the kdump reserved memory this functions performs a swap operation:
+ * - [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] is mapped to [0 - OLDMEM_SIZE].
+ * - [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
+ */
+ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
+ size_t csize, unsigned long offset, int userbuf)
+{
+ unsigned long src;
+ int rc;
+
+ if (!csize)
+ return 0;
+
+ src = (pfn << PAGE_SHIFT) + offset;
+ if (src < OLDMEM_SIZE)
+ src += OLDMEM_BASE;
+ else if (src > OLDMEM_BASE &&
+ src < OLDMEM_BASE + OLDMEM_SIZE)
+ src -= OLDMEM_BASE;
+ if (userbuf)
+ rc = copy_to_user_real((void __user *) buf, (void *) src,
+ csize);
+ else
+ rc = memcpy_real(buf, (void *) src, csize);
+ return rc < 0 ? rc : csize;
+}
+
+/*
+ * Copy memory from old kernel
+ */
+static int copy_from_oldmem(void *dest, void *src, size_t count)
+{
+ unsigned long copied = 0;
+ int rc;
+
+ if ((unsigned long) src < OLDMEM_SIZE) {
+ copied = min(count, OLDMEM_SIZE - (unsigned long) src);
+ rc = memcpy_real(dest, src + OLDMEM_BASE, copied);
+ if (rc)
+ return rc;
+ }
+ return memcpy_real(dest + copied, src + copied, count - copied);
+}
+
+/*
+ * Alloc memory and panic in case of ENOMEM
+ */
+static void *kzalloc_panic(int len)
+{
+ void *rc;
+
+ rc = kzalloc(len, GFP_KERNEL);
+ if (!rc)
+ panic("s390 kdump kzalloc (%d) failed", len);
+ return rc;
+}
+
+/*
+ * Get memory layout and create hole for oldmem
+ */
+static struct mem_chunk *get_memory_layout(void)
+{
+ struct mem_chunk *chunk_array;
+
+ chunk_array = kzalloc_panic(MEMORY_CHUNKS * sizeof(struct mem_chunk));
+ detect_memory_layout(chunk_array);
+ create_mem_hole(chunk_array, OLDMEM_BASE, OLDMEM_SIZE, CHUNK_CRASHK);
+ return chunk_array;
+}
+
+/*
+ * Initialize ELF note
+ */
+static void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len,
+ const char *name)
+{
+ Elf64_Nhdr *note;
+ u64 len;
+
+ note = (Elf64_Nhdr *)buf;
+ note->n_namesz = strlen(name) + 1;
+ note->n_descsz = d_len;
+ note->n_type = type;
+ len = sizeof(Elf64_Nhdr);
+
+ memcpy(buf + len, name, note->n_namesz);
+ len = roundup(len + note->n_namesz, 4);
+
+ memcpy(buf + len, desc, note->n_descsz);
+ len = roundup(len + note->n_descsz, 4);
+
+ return PTR_ADD(buf, len);
+}
+
+/*
+ * Initialize prstatus note
+ */
+static void *nt_prstatus(void *ptr, struct save_area *sa)
+{
+ struct elf_prstatus nt_prstatus;
+ static int cpu_nr = 1;
+
+ memset(&nt_prstatus, 0, sizeof(nt_prstatus));
+ memcpy(&nt_prstatus.pr_reg.gprs, sa->gp_regs, sizeof(sa->gp_regs));
+ memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
+ memcpy(&nt_prstatus.pr_reg.acrs, sa->acc_regs, sizeof(sa->acc_regs));
+ nt_prstatus.pr_pid = cpu_nr;
+ cpu_nr++;
+
+ return nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus),
+ "CORE");
+}
+
+/*
+ * Initialize fpregset (floating point) note
+ */
+static void *nt_fpregset(void *ptr, struct save_area *sa)
+{
+ elf_fpregset_t nt_fpregset;
+
+ memset(&nt_fpregset, 0, sizeof(nt_fpregset));
+ memcpy(&nt_fpregset.fpc, &sa->fp_ctrl_reg, sizeof(sa->fp_ctrl_reg));
+ memcpy(&nt_fpregset.fprs, &sa->fp_regs, sizeof(sa->fp_regs));
+
+ return nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset),
+ "CORE");
+}
+
+/*
+ * Initialize timer note
+ */
+static void *nt_s390_timer(void *ptr, struct save_area *sa)
+{
+ return nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer),
+ KEXEC_CORE_NOTE_NAME);
+}
+
+/*
+ * Initialize TOD clock comparator note
+ */
+static void *nt_s390_tod_cmp(void *ptr, struct save_area *sa)
+{
+ return nt_init(ptr, NT_S390_TODCMP, &sa->clk_cmp,
+ sizeof(sa->clk_cmp), KEXEC_CORE_NOTE_NAME);
+}
+
+/*
+ * Initialize TOD programmable register note
+ */
+static void *nt_s390_tod_preg(void *ptr, struct save_area *sa)
+{
+ return nt_init(ptr, NT_S390_TODPREG, &sa->tod_reg,
+ sizeof(sa->tod_reg), KEXEC_CORE_NOTE_NAME);
+}
+
+/*
+ * Initialize control register note
+ */
+static void *nt_s390_ctrs(void *ptr, struct save_area *sa)
+{
+ return nt_init(ptr, NT_S390_CTRS, &sa->ctrl_regs,
+ sizeof(sa->ctrl_regs), KEXEC_CORE_NOTE_NAME);
+}
+
+/*
+ * Initialize prefix register note
+ */
+static void *nt_s390_prefix(void *ptr, struct save_area *sa)
+{
+ return nt_init(ptr, NT_S390_PREFIX, &sa->pref_reg,
+ sizeof(sa->pref_reg), KEXEC_CORE_NOTE_NAME);
+}
+
+/*
+ * Fill ELF notes for one CPU with save area registers
+ */
+void *fill_cpu_elf_notes(void *ptr, struct save_area *sa)
+{
+ ptr = nt_prstatus(ptr, sa);
+ ptr = nt_fpregset(ptr, sa);
+ ptr = nt_s390_timer(ptr, sa);
+ ptr = nt_s390_tod_cmp(ptr, sa);
+ ptr = nt_s390_tod_preg(ptr, sa);
+ ptr = nt_s390_ctrs(ptr, sa);
+ ptr = nt_s390_prefix(ptr, sa);
+ return ptr;
+}
+
+/*
+ * Initialize prpsinfo note (new kernel)
+ */
+static void *nt_prpsinfo(void *ptr)
+{
+ struct elf_prpsinfo prpsinfo;
+
+ memset(&prpsinfo, 0, sizeof(prpsinfo));
+ prpsinfo.pr_sname = 'R';
+ strcpy(prpsinfo.pr_fname, "vmlinux");
+ return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo),
+ KEXEC_CORE_NOTE_NAME);
+}
+
+/*
+ * Initialize vmcoreinfo note (new kernel)
+ */
+static void *nt_vmcoreinfo(void *ptr)
+{
+ char nt_name[11], *vmcoreinfo;
+ Elf64_Nhdr note;
+ void *addr;
+
+ if (copy_from_oldmem(&addr, &S390_lowcore.vmcore_info, sizeof(addr)))
+ return ptr;
+ memset(nt_name, 0, sizeof(nt_name));
+ if (copy_from_oldmem(¬e, addr, sizeof(note)))
+ return ptr;
+ if (copy_from_oldmem(nt_name, addr + sizeof(note), sizeof(nt_name) - 1))
+ return ptr;
+ if (strcmp(nt_name, "VMCOREINFO") != 0)
+ return ptr;
+ vmcoreinfo = kzalloc_panic(note.n_descsz + 1);
+ if (copy_from_oldmem(vmcoreinfo, addr + 24, note.n_descsz))
+ return ptr;
+ vmcoreinfo[note.n_descsz + 1] = 0;
+ return nt_init(ptr, 0, vmcoreinfo, note.n_descsz, "VMCOREINFO");
+}
+
+/*
+ * Initialize ELF header (new kernel)
+ */
+static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt)
+{
+ memset(ehdr, 0, sizeof(*ehdr));
+ memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
+ ehdr->e_ident[EI_CLASS] = ELFCLASS64;
+ ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
+ ehdr->e_ident[EI_VERSION] = EV_CURRENT;
+ memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
+ ehdr->e_type = ET_CORE;
+ ehdr->e_machine = EM_S390;
+ ehdr->e_version = EV_CURRENT;
+ ehdr->e_phoff = sizeof(Elf64_Ehdr);
+ ehdr->e_ehsize = sizeof(Elf64_Ehdr);
+ ehdr->e_phentsize = sizeof(Elf64_Phdr);
+ ehdr->e_phnum = mem_chunk_cnt + 1;
+ return ehdr + 1;
+}
+
+/*
+ * Return CPU count for ELF header (new kernel)
+ */
+static int get_cpu_cnt(void)
+{
+ int i, cpus = 0;
+
+ for (i = 0; zfcpdump_save_areas[i]; i++) {
+ if (zfcpdump_save_areas[i]->pref_reg == 0)
+ continue;
+ cpus++;
+ }
+ return cpus;
+}
+
+/*
+ * Return memory chunk count for ELF header (new kernel)
+ */
+static int get_mem_chunk_cnt(void)
+{
+ struct mem_chunk *chunk_array, *mem_chunk;
+ int i, cnt = 0;
+
+ chunk_array = get_memory_layout();
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ mem_chunk = &chunk_array[i];
+ if (chunk_array[i].type != CHUNK_READ_WRITE &&
+ chunk_array[i].type != CHUNK_READ_ONLY)
+ continue;
+ if (mem_chunk->size == 0)
+ continue;
+ cnt++;
+ }
+ kfree(chunk_array);
+ return cnt;
+}
+
+/*
+ * Relocate pointer in order to allow vmcore code access the data
+ */
+static inline unsigned long relocate(unsigned long addr)
+{
+ return OLDMEM_BASE + addr;
+}
+
+/*
+ * Initialize ELF loads (new kernel)
+ */
+static int loads_init(Elf64_Phdr *phdr, u64 loads_offset)
+{
+ struct mem_chunk *chunk_array, *mem_chunk;
+ int i;
+
+ chunk_array = get_memory_layout();
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ mem_chunk = &chunk_array[i];
+ if (mem_chunk->size == 0)
+ break;
+ if (chunk_array[i].type != CHUNK_READ_WRITE &&
+ chunk_array[i].type != CHUNK_READ_ONLY)
+ continue;
+ else
+ phdr->p_filesz = mem_chunk->size;
+ phdr->p_type = PT_LOAD;
+ phdr->p_offset = mem_chunk->addr;
+ phdr->p_vaddr = mem_chunk->addr;
+ phdr->p_paddr = mem_chunk->addr;
+ phdr->p_memsz = mem_chunk->size;
+ phdr->p_flags = PF_R | PF_W | PF_X;
+ phdr->p_align = PAGE_SIZE;
+ phdr++;
+ }
+ kfree(chunk_array);
+ return i;
+}
+
+/*
+ * Initialize notes (new kernel)
+ */
+static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset)
+{
+ struct save_area *sa;
+ void *ptr_start = ptr;
+ int i;
+
+ ptr = nt_prpsinfo(ptr);
+
+ for (i = 0; zfcpdump_save_areas[i]; i++) {
+ sa = zfcpdump_save_areas[i];
+ if (sa->pref_reg == 0)
+ continue;
+ ptr = fill_cpu_elf_notes(ptr, sa);
+ }
+ ptr = nt_vmcoreinfo(ptr);
+ memset(phdr, 0, sizeof(*phdr));
+ phdr->p_type = PT_NOTE;
+ phdr->p_offset = relocate(notes_offset);
+ phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start);
+ phdr->p_memsz = phdr->p_filesz;
+ return ptr;
+}
+
+/*
+ * Create ELF core header (new kernel)
+ */
+static void s390_elf_corehdr_create(char **elfcorebuf, size_t *elfcorebuf_sz)
+{
+ Elf64_Phdr *phdr_notes, *phdr_loads;
+ int mem_chunk_cnt;
+ void *ptr, *hdr;
+ u32 alloc_size;
+ u64 hdr_off;
+
+ mem_chunk_cnt = get_mem_chunk_cnt();
+
+ alloc_size = 0x1000 + get_cpu_cnt() * 0x300 +
+ mem_chunk_cnt * sizeof(Elf64_Phdr);
+ hdr = kzalloc_panic(alloc_size);
+ /* Init elf header */
+ ptr = ehdr_init(hdr, mem_chunk_cnt);
+ /* Init program headers */
+ phdr_notes = ptr;
+ ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr));
+ phdr_loads = ptr;
+ ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt);
+ /* Init notes */
+ hdr_off = PTR_DIFF(ptr, hdr);
+ ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off);
+ /* Init loads */
+ hdr_off = PTR_DIFF(ptr, hdr);
+ loads_init(phdr_loads, ((unsigned long) hdr) + hdr_off);
+ *elfcorebuf_sz = hdr_off;
+ *elfcorebuf = (void *) relocate((unsigned long) hdr);
+ BUG_ON(*elfcorebuf_sz > alloc_size);
+}
+
+/*
+ * Create kdump ELF core header in new kernel, if it has not been passed via
+ * the "elfcorehdr" kernel parameter
+ */
+static int setup_kdump_elfcorehdr(void)
+{
+ size_t elfcorebuf_sz;
+ char *elfcorebuf;
+
+ if (!OLDMEM_BASE || is_kdump_kernel())
+ return -EINVAL;
+ s390_elf_corehdr_create(&elfcorebuf, &elfcorebuf_sz);
+ elfcorehdr_addr = (unsigned long long) elfcorebuf;
+ elfcorehdr_size = elfcorebuf_sz;
+ return 0;
+}
+
+subsys_initcall(setup_kdump_elfcorehdr);
#
.org 0x10000
ENTRY(startup)
+ j .Lep_startup_normal
+ .org 0x10008
+#
+# This is a list of s390 kernel entry points. At address 0x1000f the number of
+# valid entry points is stored.
+#
+# IMPORTANT: Do not change this table, it is s390 kernel ABI!
+#
+ .ascii "S390EP"
+ .byte 0x00,0x01
+#
+# kdump startup-code at 0x10010, running in 64 bit absolute addressing mode
+#
+ .org 0x10010
+ENTRY(startup_kdump)
+ j .Lep_startup_kdump
+.Lep_startup_normal:
basr %r13,0 # get base
.LPG0:
xc 0x200(256),0x200 # partially clear lowcore
xc 0x300(256),0x300
+ xc 0xe00(256),0xe00
stck __LC_LAST_UPDATE_CLOCK
spt 5f-.LPG0(%r13)
mvc __LC_LAST_UPDATE_TIMER(8),5f-.LPG0(%r13)
.align 8
5: .long 0x7fffffff,0xffffffff
+#include "head_kdump.S"
+
#
# params at 10400 (setup.h)
#
.long 0,0 # IPL_DEVICE
.long 0,0 # INITRD_START
.long 0,0 # INITRD_SIZE
+ .long 0,0 # OLDMEM_BASE
+ .long 0,0 # OLDMEM_SIZE
.org COMMAND_LINE
.byte "root=/dev/ram0 ro"
--- /dev/null
+/*
+ * S390 kdump lowlevel functions (new kernel)
+ *
+ * Copyright IBM Corp. 2011
+ * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#define DATAMOVER_ADDR 0x4000
+#define COPY_PAGE_ADDR 0x6000
+
+#ifdef CONFIG_CRASH_DUMP
+
+#
+# kdump entry (new kernel - not yet relocated)
+#
+# Note: This code has to be position independent
+#
+
+.align 2
+.Lep_startup_kdump:
+ lhi %r1,2 # mode 2 = esame (dump)
+ sigp %r1,%r0,0x12 # Switch to esame mode
+ sam64 # Switch to 64 bit addressing
+ basr %r13,0
+.Lbase:
+ larl %r2,.Lbase_addr # Check, if we have been
+ lg %r2,0(%r2) # already relocated:
+ clgr %r2,%r13 #
+ jne .Lrelocate # No : Start data mover
+ lghi %r2,0 # Yes: Start kdump kernel
+ brasl %r14,startup_kdump_relocated
+
+.Lrelocate:
+ larl %r4,startup
+ lg %r2,0x418(%r4) # Get kdump base
+ lg %r3,0x420(%r4) # Get kdump size
+
+ larl %r10,.Lcopy_start # Source of data mover
+ lghi %r8,DATAMOVER_ADDR # Target of data mover
+ mvc 0(256,%r8),0(%r10) # Copy data mover code
+
+ agr %r8,%r2 # Copy data mover to
+ mvc 0(256,%r8),0(%r10) # reserved mem
+
+ lghi %r14,DATAMOVER_ADDR # Jump to copied data mover
+ basr %r14,%r14
+.Lbase_addr:
+ .quad .Lbase
+
+#
+# kdump data mover code (runs at address DATAMOVER_ADDR)
+#
+# r2: kdump base address
+# r3: kdump size
+#
+.Lcopy_start:
+ basr %r13,0 # Base
+0:
+ lgr %r11,%r2 # Save kdump base address
+ lgr %r12,%r2
+ agr %r12,%r3 # Compute kdump end address
+
+ lghi %r5,0
+ lghi %r10,COPY_PAGE_ADDR # Load copy page address
+1:
+ mvc 0(256,%r10),0(%r5) # Copy old kernel to tmp
+ mvc 0(256,%r5),0(%r11) # Copy new kernel to old
+ mvc 0(256,%r11),0(%r10) # Copy tmp to new
+ aghi %r11,256
+ aghi %r5,256
+ clgr %r11,%r12
+ jl 1b
+
+ lg %r14,.Lstartup_kdump-0b(%r13)
+ basr %r14,%r14 # Start relocated kernel
+.Lstartup_kdump:
+ .long 0x00000000,0x00000000 + startup_kdump_relocated
+.Lcopy_end:
+
+#
+# Startup of kdump (relocated new kernel)
+#
+.align 2
+startup_kdump_relocated:
+ basr %r13,0
+0:
+ mvc 0(8,%r0),.Lrestart_psw-0b(%r13) # Setup restart PSW
+ mvc 464(16,%r0),.Lpgm_psw-0b(%r13) # Setup pgm check PSW
+ lhi %r1,1 # Start new kernel
+ diag %r1,%r1,0x308 # with diag 308
+
+.Lno_diag308: # No diag 308
+ sam31 # Switch to 31 bit addr mode
+ sr %r1,%r1 # Erase register r1
+ sr %r2,%r2 # Erase register r2
+ sigp %r1,%r2,0x12 # Switch to 31 bit arch mode
+ lpsw 0 # Start new kernel...
+.align 8
+.Lrestart_psw:
+ .long 0x00080000,0x80000000 + startup
+.Lpgm_psw:
+ .quad 0x0000000180000000,0x0000000000000000 + .Lno_diag308
+#else
+.align 2
+.Lep_startup_kdump:
+#ifdef CONFIG_64BIT
+ larl %r13,startup_kdump_crash
+ lpswe 0(%r13)
+.align 8
+startup_kdump_crash:
+ .quad 0x0002000080000000,0x0000000000000000 + startup_kdump_crash
+#else
+ basr %r13,0
+0: lpsw startup_kdump_crash-0b(%r13)
+.align 8
+startup_kdump_crash:
+ .long 0x000a0000,0x00000000 + startup_kdump_crash
+#endif /* CONFIG_64BIT */
+#endif /* CONFIG_CRASH_DUMP */
#include <linux/ctype.h>
#include <linux/fs.h>
#include <linux/gfp.h>
+#include <linux/crash_dump.h>
#include <asm/ipl.h>
#include <asm/smp.h>
#include <asm/setup.h>
{
smp_restart_with_online_cpu();
smp_send_stop();
+#ifdef CONFIG_CRASH_DUMP
+ crash_kexec(NULL);
+#endif
on_restart_trigger.action->fn(&on_restart_trigger);
stop_run(&on_restart_trigger);
}
u32 dump_prefix_page;
-void s390_reset_system(void)
+void s390_reset_system(void (*func)(void *), void *data)
{
struct _lowcore *lc;
S390_lowcore.program_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
+ /* Store status at absolute zero */
+ store_status();
+
do_reset_calls();
+ if (func)
+ func(data);
}
-
/*
* arch/s390/kernel/machine_kexec.c
*
- * Copyright IBM Corp. 2005,2006
+ * Copyright IBM Corp. 2005,2011
*
* Author(s): Rolf Adelsberger,
* Heiko Carstens <heiko.carstens@de.ibm.com>
+ * Michael Holzheu <holzheu@linux.vnet.ibm.com>
*/
#include <linux/device.h>
#include <asm/smp.h>
#include <asm/reset.h>
#include <asm/ipl.h>
+#include <asm/diag.h>
+#include <asm/asm-offsets.h>
typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
extern const unsigned char relocate_kernel[];
extern const unsigned long long relocate_kernel_len;
+#ifdef CONFIG_CRASH_DUMP
+
+void *fill_cpu_elf_notes(void *ptr, struct save_area *sa);
+
+/*
+ * Create ELF notes for one CPU
+ */
+static void add_elf_notes(int cpu)
+{
+ struct save_area *sa = (void *) 4608 + store_prefix();
+ void *ptr;
+
+ memcpy((void *) (4608UL + sa->pref_reg), sa, sizeof(*sa));
+ ptr = (u64 *) per_cpu_ptr(crash_notes, cpu);
+ ptr = fill_cpu_elf_notes(ptr, sa);
+ memset(ptr, 0, sizeof(struct elf_note));
+}
+
+/*
+ * Store status of next available physical CPU
+ */
+static int store_status_next(int start_cpu, int this_cpu)
+{
+ struct save_area *sa = (void *) 4608 + store_prefix();
+ int cpu, rc;
+
+ for (cpu = start_cpu; cpu < 65536; cpu++) {
+ if (cpu == this_cpu)
+ continue;
+ do {
+ rc = raw_sigp(cpu, sigp_stop_and_store_status);
+ } while (rc == sigp_busy);
+ if (rc != sigp_order_code_accepted)
+ continue;
+ if (sa->pref_reg)
+ return cpu;
+ }
+ return -1;
+}
+
+/*
+ * Initialize CPU ELF notes
+ */
+void setup_regs(void)
+{
+ unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE;
+ int cpu, this_cpu, phys_cpu = 0, first = 1;
+
+ this_cpu = stap();
+
+ if (!S390_lowcore.prefixreg_save_area)
+ first = 0;
+ for_each_online_cpu(cpu) {
+ if (first) {
+ add_elf_notes(cpu);
+ first = 0;
+ continue;
+ }
+ phys_cpu = store_status_next(phys_cpu, this_cpu);
+ if (phys_cpu == -1)
+ break;
+ add_elf_notes(cpu);
+ phys_cpu++;
+ }
+ /* Copy dump CPU store status info to absolute zero */
+ memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area));
+}
+
+#endif
+
+/*
+ * Start kdump: We expect here that a store status has been done on our CPU
+ */
+static void __do_machine_kdump(void *image)
+{
+#ifdef CONFIG_CRASH_DUMP
+ int (*start_kdump)(int) = (void *)((struct kimage *) image)->start;
+
+ __load_psw_mask(PSW_BASE_BITS | PSW_DEFAULT_KEY);
+ setup_regs();
+ start_kdump(1);
+#endif
+}
+
+/*
+ * Check if kdump checksums are valid: We call purgatory with parameter "0"
+ */
+static int kdump_csum_valid(struct kimage *image)
+{
+#ifdef CONFIG_CRASH_DUMP
+ int (*start_kdump)(int) = (void *)image->start;
+ int rc;
+
+ __arch_local_irq_stnsm(0xfb); /* disable DAT */
+ rc = start_kdump(0);
+ __arch_local_irq_stosm(0x04); /* enable DAT */
+ return rc ? 0 : -EINVAL;
+#else
+ return -EINVAL;
+#endif
+}
+
+/*
+ * Give back memory to hypervisor before new kdump is loaded
+ */
+static int machine_kexec_prepare_kdump(void)
+{
+#ifdef CONFIG_CRASH_DUMP
+ if (MACHINE_IS_VM)
+ diag10_range(PFN_DOWN(crashk_res.start),
+ PFN_DOWN(crashk_res.end - crashk_res.start + 1));
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
int machine_kexec_prepare(struct kimage *image)
{
void *reboot_code_buffer;
if (ipl_flags & IPL_NSS_VALID)
return -ENOSYS;
+ if (image->type == KEXEC_TYPE_CRASH)
+ return machine_kexec_prepare_kdump();
+
/* We don't support anything but the default image type for now. */
if (image->type != KEXEC_TYPE_DEFAULT)
return -EINVAL;
{
}
+void arch_crash_save_vmcoreinfo(void)
+{
+ VMCOREINFO_SYMBOL(lowcore_ptr);
+ VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS);
+}
+
void machine_shutdown(void)
{
}
-static void __machine_kexec(void *data)
+/*
+ * Do normal kexec
+ */
+static void __do_machine_kexec(void *data)
{
relocate_kernel_t data_mover;
struct kimage *image = data;
- pfault_fini();
- s390_reset_system();
-
data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
/* Call the moving routine */
(*data_mover)(&image->head, image->start);
- for (;;);
}
+/*
+ * Reset system and call either kdump or normal kexec
+ */
+static void __machine_kexec(void *data)
+{
+ struct kimage *image = data;
+
+ pfault_fini();
+ if (image->type == KEXEC_TYPE_CRASH)
+ s390_reset_system(__do_machine_kdump, data);
+ else
+ s390_reset_system(__do_machine_kexec, data);
+ disabled_wait((unsigned long) __builtin_return_address(0));
+}
+
+/*
+ * Do either kdump or normal kexec. In case of kdump we first ask
+ * purgatory, if kdump checksums are valid.
+ */
void machine_kexec(struct kimage *image)
{
+ if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image))
+ return;
tracer_disable();
smp_send_stop();
smp_switch_to_ipl_cpu(__machine_kexec, image);
arch_local_irq_restore(flags);
}
EXPORT_SYMBOL(detect_memory_layout);
+
+/*
+ * Create memory hole with given address, size, and type
+ */
+void create_mem_hole(struct mem_chunk chunks[], unsigned long addr,
+ unsigned long size, int type)
+{
+ unsigned long start, end, new_size;
+ int i;
+
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ if (chunks[i].size == 0)
+ continue;
+ if (addr + size < chunks[i].addr)
+ continue;
+ if (addr >= chunks[i].addr + chunks[i].size)
+ continue;
+ start = max(addr, chunks[i].addr);
+ end = min(addr + size, chunks[i].addr + chunks[i].size);
+ new_size = end - start;
+ if (new_size == 0)
+ continue;
+ if (start == chunks[i].addr &&
+ end == chunks[i].addr + chunks[i].size) {
+ /* Remove chunk */
+ chunks[i].type = type;
+ } else if (start == chunks[i].addr) {
+ /* Make chunk smaller at start */
+ if (i >= MEMORY_CHUNKS - 1)
+ panic("Unable to create memory hole");
+ memmove(&chunks[i + 1], &chunks[i],
+ sizeof(struct mem_chunk) *
+ (MEMORY_CHUNKS - (i + 1)));
+ chunks[i + 1].addr = chunks[i].addr + new_size;
+ chunks[i + 1].size = chunks[i].size - new_size;
+ chunks[i].size = new_size;
+ chunks[i].type = type;
+ i += 1;
+ } else if (end == chunks[i].addr + chunks[i].size) {
+ /* Make chunk smaller at end */
+ if (i >= MEMORY_CHUNKS - 1)
+ panic("Unable to create memory hole");
+ memmove(&chunks[i + 1], &chunks[i],
+ sizeof(struct mem_chunk) *
+ (MEMORY_CHUNKS - (i + 1)));
+ chunks[i + 1].addr = start;
+ chunks[i + 1].size = new_size;
+ chunks[i + 1].type = type;
+ chunks[i].size -= new_size;
+ i += 1;
+ } else {
+ /* Create memory hole */
+ if (i >= MEMORY_CHUNKS - 2)
+ panic("Unable to create memory hole");
+ memmove(&chunks[i + 2], &chunks[i],
+ sizeof(struct mem_chunk) *
+ (MEMORY_CHUNKS - (i + 2)));
+ chunks[i + 1].addr = addr;
+ chunks[i + 1].size = size;
+ chunks[i + 1].type = type;
+ chunks[i + 2].addr = addr + size;
+ chunks[i + 2].size =
+ chunks[i].addr + chunks[i].size - (addr + size);
+ chunks[i + 2].type = chunks[i].type;
+ chunks[i].size = addr - chunks[i].addr;
+ i += 2;
+ }
+ }
+}
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
+#
+# store_status: Empty implementation until kdump is supported on 31 bit
+#
+ENTRY(store_status)
+ br %r14
+
#
# do_reipl_asm
# Parameter: r2 = schid of reipl device
larl %r2,store_status
stg %r2,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 8(%r1)
br %r14
-.align 8
+
+ .section .bss
+ .align 8
.Lclkcmp: .quad 0x0000000000000000
+ .previous
#
# do_reipl_asm
#include <linux/reboot.h>
#include <linux/topology.h>
#include <linux/ftrace.h>
+#include <linux/kexec.h>
+#include <linux/crash_dump.h>
+#include <linux/memory.h>
#include <asm/ipl.h>
#include <asm/uaccess.h>
#include <asm/ebcdic.h>
#include <asm/compat.h>
#include <asm/kvm_virtio.h>
+#include <asm/diag.h>
long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
for (i = 0; i < MEMORY_CHUNKS; i++) {
if (!memory_chunk[i].size)
continue;
+ if (memory_chunk[i].type == CHUNK_OLDMEM ||
+ memory_chunk[i].type == CHUNK_CRASHK)
+ continue;
res = alloc_bootmem_low(sizeof(*res));
res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
switch (memory_chunk[i].type) {
unsigned long max_mem;
int i;
+
#ifdef CONFIG_ZFCPDUMP
if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
memory_end = ZFCPDUMP_HSA_SIZE;
copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
}
+#ifdef CONFIG_CRASH_DUMP
+
+/*
+ * Find suitable location for crashkernel memory
+ */
+static unsigned long __init find_crash_base(unsigned long crash_size,
+ char **msg)
+{
+ unsigned long crash_base;
+ struct mem_chunk *chunk;
+ int i;
+
+ if (memory_chunk[0].size < crash_size) {
+ *msg = "first memory chunk must be at least crashkernel size";
+ return 0;
+ }
+ if (is_kdump_kernel() && (crash_size == OLDMEM_SIZE))
+ return OLDMEM_BASE;
+
+ for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
+ chunk = &memory_chunk[i];
+ if (chunk->size == 0)
+ continue;
+ if (chunk->type != CHUNK_READ_WRITE)
+ continue;
+ if (chunk->size < crash_size)
+ continue;
+ crash_base = (chunk->addr + chunk->size) - crash_size;
+ if (crash_base < crash_size)
+ continue;
+ if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
+ continue;
+ if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
+ continue;
+ return crash_base;
+ }
+ *msg = "no suitable area found";
+ return 0;
+}
+
+/*
+ * Check if crash_base and crash_size is valid
+ */
+static int __init verify_crash_base(unsigned long crash_base,
+ unsigned long crash_size,
+ char **msg)
+{
+ struct mem_chunk *chunk;
+ int i;
+
+ /*
+ * Because we do the swap to zero, we must have at least 'crash_size'
+ * bytes free space before crash_base
+ */
+ if (crash_size > crash_base) {
+ *msg = "crashkernel offset must be greater than size";
+ return -EINVAL;
+ }
+
+ /* First memory chunk must be at least crash_size */
+ if (memory_chunk[0].size < crash_size) {
+ *msg = "first memory chunk must be at least crashkernel size";
+ return -EINVAL;
+ }
+ /* Check if we fit into the respective memory chunk */
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ chunk = &memory_chunk[i];
+ if (chunk->size == 0)
+ continue;
+ if (crash_base < chunk->addr)
+ continue;
+ if (crash_base >= chunk->addr + chunk->size)
+ continue;
+ /* we have found the memory chunk */
+ if (crash_base + crash_size > chunk->addr + chunk->size) {
+ *msg = "selected memory chunk is too small for "
+ "crashkernel memory";
+ return -EINVAL;
+ }
+ return 0;
+ }
+ *msg = "invalid memory range specified";
+ return -EINVAL;
+}
+
+/*
+ * Reserve kdump memory by creating a memory hole in the mem_chunk array
+ */
+static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
+ int type)
+{
+
+ create_mem_hole(memory_chunk, addr, size, type);
+}
+
+/*
+ * When kdump is enabled, we have to ensure that no memory from
+ * the area [0 - crashkernel memory size] and
+ * [crashk_res.start - crashk_res.end] is set offline.
+ */
+static int kdump_mem_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct memory_notify *arg = data;
+
+ if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
+ return NOTIFY_BAD;
+ if (arg->start_pfn > PFN_DOWN(crashk_res.end))
+ return NOTIFY_OK;
+ if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
+ return NOTIFY_OK;
+ return NOTIFY_BAD;
+}
+
+static struct notifier_block kdump_mem_nb = {
+ .notifier_call = kdump_mem_notifier,
+};
+
+#endif
+
+/*
+ * Make sure that oldmem, where the dump is stored, is protected
+ */
+static void reserve_oldmem(void)
+{
+#ifdef CONFIG_CRASH_DUMP
+ if (!OLDMEM_BASE)
+ return;
+
+ reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
+ reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
+ CHUNK_OLDMEM);
+ if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
+ saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
+ else
+ saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
+#endif
+}
+
+/*
+ * Reserve memory for kdump kernel to be loaded with kexec
+ */
+static void __init reserve_crashkernel(void)
+{
+#ifdef CONFIG_CRASH_DUMP
+ unsigned long long crash_base, crash_size;
+ char *msg;
+ int rc;
+
+ rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
+ &crash_base);
+ if (rc || crash_size == 0)
+ return;
+ crash_base = PAGE_ALIGN(crash_base);
+ crash_size = PAGE_ALIGN(crash_size);
+ if (register_memory_notifier(&kdump_mem_nb))
+ return;
+ if (!crash_base)
+ crash_base = find_crash_base(crash_size, &msg);
+ if (!crash_base) {
+ pr_info("crashkernel reservation failed: %s\n", msg);
+ unregister_memory_notifier(&kdump_mem_nb);
+ return;
+ }
+ if (verify_crash_base(crash_base, crash_size, &msg)) {
+ pr_info("crashkernel reservation failed: %s\n", msg);
+ unregister_memory_notifier(&kdump_mem_nb);
+ return;
+ }
+ if (!OLDMEM_BASE && MACHINE_IS_VM)
+ diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
+ crashk_res.start = crash_base;
+ crashk_res.end = crash_base + crash_size - 1;
+ insert_resource(&iomem_resource, &crashk_res);
+ reserve_kdump_bootmem(crash_base, crash_size, CHUNK_READ_WRITE);
+ pr_info("Reserving %lluMB of memory at %lluMB "
+ "for crashkernel (System RAM: %luMB)\n",
+ crash_size >> 20, crash_base >> 20, memory_end >> 20);
+#endif
+}
+
static void __init
setup_memory(void)
{
if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
+#ifdef CONFIG_CRASH_DUMP
+ if (OLDMEM_BASE) {
+ /* Move initrd behind kdump oldmem */
+ if (start + INITRD_SIZE > OLDMEM_BASE &&
+ start < OLDMEM_BASE + OLDMEM_SIZE)
+ start = OLDMEM_BASE + OLDMEM_SIZE;
+ }
+#endif
if (start + INITRD_SIZE > memory_end) {
pr_err("initrd extends beyond end of "
"memory (0x%08lx > 0x%08lx) "
reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
BOOTMEM_DEFAULT);
+#ifdef CONFIG_CRASH_DUMP
+ if (crashk_res.start)
+ reserve_bootmem(crashk_res.start,
+ crashk_res.end - crashk_res.start + 1,
+ BOOTMEM_DEFAULT);
+ if (is_kdump_kernel())
+ reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
+ PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
+#endif
#ifdef CONFIG_BLK_DEV_INITRD
if (INITRD_START && INITRD_SIZE) {
if (INITRD_START + INITRD_SIZE <= memory_end) {
setup_ipl();
setup_memory_end();
setup_addressing_mode();
+ reserve_oldmem();
+ reserve_crashkernel();
setup_memory();
setup_resources();
setup_restart_psw();
#include <linux/timex.h>
#include <linux/bootmem.h>
#include <linux/slab.h>
+#include <linux/crash_dump.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
#include <asm/setup.h>
}
EXPORT_SYMBOL(smp_ctl_clear_bit);
-#ifdef CONFIG_ZFCPDUMP
+#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP)
static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
{
- if (ipl_info.type != IPL_TYPE_FCP_DUMP)
+ if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE)
+ return;
+ if (is_kdump_kernel())
return;
if (cpu >= NR_CPUS) {
pr_warning("CPU %i exceeds the maximum %i and is excluded from "
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)
panic("smp_detect_cpus failed to allocate memory\n");
+#ifdef CONFIG_CRASH_DUMP
+ if (OLDMEM_BASE && !is_kdump_kernel()) {
+ struct save_area *save_area;
+
+ save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
+ if (!save_area)
+ panic("could not allocate memory for save area\n");
+ copy_oldmem_page(1, (void *) save_area, sizeof(*save_area),
+ 0x200, 0);
+ zfcpdump_save_areas[0] = save_area;
+ }
+#endif
/* Use sigp detection algorithm if sclp doesn't work. */
if (sclp_get_cpu_info(info)) {
smp_use_sigp_detection = 1;
ro_start = ((unsigned long)&_stext) & PAGE_MASK;
ro_end = PFN_ALIGN((unsigned long)&_eshared);
for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
+ if (memory_chunk[i].type == CHUNK_CRASHK ||
+ memory_chunk[i].type == CHUNK_OLDMEM)
+ continue;
start = memory_chunk[i].addr;
end = memory_chunk[i].addr + memory_chunk[i].size;
if (start >= ro_end || end <= ro_start)
for (i = 0; i < MEMORY_CHUNKS; i++) {
if (!memory_chunk[i].size)
continue;
+ if (memory_chunk[i].type == CHUNK_CRASHK ||
+ memory_chunk[i].type == CHUNK_OLDMEM)
+ continue;
seg = kzalloc(sizeof(*seg), GFP_KERNEL);
if (!seg)
panic("Out of memory...\n");
{
struct subchannel_id schid;
- s390_reset_system();
+ s390_reset_system(NULL, NULL);
if (reipl_find_schid(devid, &schid) != 0)
panic("IPL Device not found\n");
do_reipl_asm(*((__u32*)&schid));
projects / openwrt / staging / blogic.git / commitdiff