[patch 8/9] s390: kdump backend code

From: Michael Holzheu
Date: Mon Jul 04 2011 - 13:12:35 EST

From: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>

This patch provides the architecture specific part of the s390 kdump
support. This includes the following changes:
* S390 backend code for kdump/kexec framework
* New restart shutdown trigger and kdump action
* New meminfo interface to allow external kdump triggers

Signed-off-by: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
---
arch/s390/Kconfig | 10
arch/s390/include/asm/checksum.h | 18 +
arch/s390/include/asm/ipl.h | 4
arch/s390/include/asm/kexec.h | 3
arch/s390/include/asm/lowcore.h | 62 +++++
arch/s390/include/asm/sclp.h | 1
arch/s390/include/asm/setup.h | 5
arch/s390/include/asm/system.h | 4
arch/s390/kernel/Makefile | 3
arch/s390/kernel/asm-offsets.c | 7
arch/s390/kernel/base.S | 37 +++
arch/s390/kernel/crash_dump.c | 76 ++++++
arch/s390/kernel/crash_dump_elf.c | 434 ++++++++++++++++++++++++++++++++++++++
arch/s390/kernel/early.c | 12 +
arch/s390/kernel/entry.S | 28 ++
arch/s390/kernel/entry64.S | 21 +
arch/s390/kernel/head.S | 14 +
arch/s390/kernel/head_kdump.S | 133 +++++++++++
arch/s390/kernel/ipl.c | 201 ++++++++++++++---
arch/s390/kernel/machine_kexec.c | 164 ++++++++++++++
arch/s390/kernel/mem_detect.c | 70 ++++++
arch/s390/kernel/meminfo.c | 132 +++++++++++
arch/s390/kernel/reipl64.S | 82 +++++--
arch/s390/kernel/setup.c | 210 ++++++++++++++++++
arch/s390/kernel/smp.c | 26 ++
arch/s390/mm/maccess.c | 83 +++++++
arch/s390/mm/vmem.c | 3
drivers/s390/char/zcore.c | 20 -
28 files changed, 1784 insertions(+), 79 deletions(-)

--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -567,6 +567,16 @@ config KEXEC
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"
--- a/arch/s390/include/asm/checksum.h
+++ b/arch/s390/include/asm/checksum.h
@@ -41,6 +41,24 @@ csum_partial(const void *buff, int len,
}

/*
+ * The same as csum_partial(), but operates on real memory
+ */
+static inline __wsum csum_partial_real(const void *buf, int len, __wsum sum)
+{
+ register unsigned long reg2 asm("2") = (unsigned long) buf;
+ register unsigned long reg3 asm("3") = (unsigned long) len;
+ unsigned long flags;
+
+ flags = __arch_local_irq_stnsm(0xf8UL);
+ asm volatile(
+ "0: cksm %0,%1\n"
+ " jo 0b\n"
+ : "+d" (sum), "+d" (reg2), "+d" (reg3) : : "cc", "memory");
+ arch_local_irq_restore(flags);
+ return sum;
+}
+
+/*
* the same as csum_partial_copy, but copies from user space.
*
* here even more important to align src and dst on a 32-bit (or even
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -167,5 +167,9 @@ enum diag308_rc {
};

extern int diag308(unsigned long subcode, void *addr);
+void do_reset_diag308(void);
+void do_store_status(void);
+ssize_t crash_read_from_oldmem(void *buf, size_t count, u64 ppos, int userbuf);
+void machine_kdump(void);

#endif /* _ASM_S390_IPL_H */
--- a/arch/s390/include/asm/kexec.h
+++ b/arch/s390/include/asm/kexec.h
@@ -30,6 +30,9 @@
/* 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

--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -18,6 +18,45 @@ void system_call(void);
void pgm_check_handler(void);
void mcck_int_handler(void);
void io_int_handler(void);
+void psw_restart_int_handler(void);
+
+/*
+ * Meminfo types: The defined numbers are ABI and must not be changed
+ */
+enum meminfo_type {
+ MEMINFO_TYPE_IPIB = 0,
+ MEMINFO_TYPE_VMCOREINFO = 1,
+ MEMINFO_TYPE_KDUMP_MEM = 2,
+ MEMINFO_TYPE_KDUMP_SEGM = 3,
+ MEMINFO_TYPE_LAST = 4,
+};
+
+/*
+ * Meminfo flags: The flags are ABI and must not be changed
+ */
+#define MEMINFO_FLAG_ELEM_VALID 0x00000001U
+#define MEMINFO_FLAG_ELEM_IND 0x00000002U
+#define MEMINFO_FLAG_CSUM_VALID 0x00000004U
+
+struct meminfo {
+ unsigned long addr;
+ unsigned long size;
+ u32 csum;
+ u32 flags;
+} __packed;
+
+extern struct meminfo meminfo_array[MEMINFO_TYPE_LAST];
+
+void meminfo_init(void);
+int meminfo_csum_check(struct meminfo *meminfo, int recursive);
+void meminfo_update(enum meminfo_type type, void *buf, unsigned long size,
+ u32 flags);
+
+#ifdef CONFIG_CRASH_DUMP
+int meminfo_old_get(enum meminfo_type type, struct meminfo *meminfo);
+extern unsigned long oldmem_base;
+extern unsigned long oldmem_size;
+#endif

#ifdef CONFIG_32BIT

@@ -150,7 +189,14 @@ struct _lowcore {
*/
__u32 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e04 */
- __u8 pad_0x0e08[0x0f00-0x0e08]; /* 0x0e08 */
+
+ /* 64 bit save area */
+ __u64 save_area_64; /* 0x0e08 */
+
+ /* meminfo root */
+ struct meminfo meminfo; /* 0x0e10 */
+ __u32 meminfo_csum; /* 0x0e20 */
+ __u8 pad_0x0e24[0x0f00-0x0e24]; /* 0x0e24 */

/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
@@ -286,7 +332,19 @@ struct _lowcore {
*/
__u64 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e08 */
- __u8 pad_0x0e0c[0x0f00-0x0e0c]; /* 0x0e0c */
+
+ /* 64 bit save area */
+ __u64 save_area_64; /* 0x0e0c */
+
+ /* meminfo root */
+ struct meminfo meminfo; /* 0x0e14 */
+ __u32 meminfo_csum; /* 0x0e2c */
+
+ /* oldmem base */
+ __u64 oldmem_base; /* 0x0e30 */
+ /* oldmem size */
+ __u64 oldmem_size; /* 0x0e38 */
+ __u8 pad_0x0e40[0x0f00-0x0e40]; /* 0x0e40 */

/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -55,4 +55,5 @@ int sclp_chp_deconfigure(struct chp_id c
int sclp_chp_read_info(struct sclp_chp_info *info);
void sclp_get_ipl_info(struct sclp_ipl_info *info);

+void _sclp_print_early(const char *);
#endif /* _ASM_S390_SCLP_H */
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -35,6 +35,8 @@

#define CHUNK_READ_WRITE 0
#define CHUNK_READ_ONLY 1
+#define CHUNK_OLDMEM 4
+#define CHUNK_CRASHK 5

struct mem_chunk {
unsigned long addr;
@@ -48,6 +50,8 @@ extern int memory_end_set;
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
@@ -106,6 +110,7 @@ extern unsigned int user_mode;
#endif /* __s390x__ */

#define ZFCPDUMP_HSA_SIZE (32UL<<20)
+#define ZFCPDUMP_HSA_SIZE_MAX (64UL<<20)

/*
* Console mode. Override with conmode=
--- a/arch/s390/include/asm/system.h
+++ b/arch/s390/include/asm/system.h
@@ -113,6 +113,10 @@ extern void pfault_fini(void);

extern void cmma_init(void);
extern int memcpy_real(void *, void *, size_t);
+extern int copy_to_user_real(void __user *dest, void *src, size_t count);
+extern int copy_from_user_real(void *dest, void __user *src, size_t count);
+extern void copy_to_absolute_zero(void *dest, void *src, size_t count);
+extern void copy_from_absolute_zero(void *dest, void *src, size_t count);

#define finish_arch_switch(prev) do { \
set_fs(current->thread.mm_segment); \
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -23,7 +23,7 @@ CFLAGS_sysinfo.o += -Iinclude/math-emu -
obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o \
processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o \
debug.o irq.o ipl.o dis.o diag.o mem_detect.o sclp.o vdso.o \
- sysinfo.o jump_label.o
+ sysinfo.o jump_label.o meminfo.o

obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
@@ -48,6 +48,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += $(if $(
obj-$(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 crash_dump_elf.o

# Kexec part
S390_KEXEC_OBJS := machine_kexec.o crash.o
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -142,6 +142,11 @@ int main(void)
DEFINE(__LC_FPREGS_SAVE_AREA, offsetof(struct _lowcore, floating_pt_save_area));
DEFINE(__LC_GPREGS_SAVE_AREA, offsetof(struct _lowcore, gpregs_save_area));
DEFINE(__LC_CREGS_SAVE_AREA, offsetof(struct _lowcore, cregs_save_area));
+ DEFINE(__LC_SAVE_AREA_64, offsetof(struct _lowcore, save_area_64));
+ DEFINE(__LC_MEMINFO, offsetof(struct _lowcore, meminfo));
+ DEFINE(__MI_TYPE_KDUMP_MEM, (MEMINFO_TYPE_KDUMP_MEM * sizeof(struct meminfo)));
+ DEFINE(__MI_ADDR, offsetof(struct meminfo, addr));
+ DEFINE(__MI_SIZE, offsetof(struct meminfo, size));
#ifdef CONFIG_32BIT
DEFINE(SAVE_AREA_BASE, offsetof(struct _lowcore, extended_save_area_addr));
#else /* CONFIG_32BIT */
@@ -153,6 +158,8 @@ int main(void)
DEFINE(__LC_VDSO_PER_CPU, offsetof(struct _lowcore, vdso_per_cpu_data));
DEFINE(__LC_SIE_HOOK, offsetof(struct _lowcore, sie_hook));
DEFINE(__LC_CMF_HPP, offsetof(struct _lowcore, cmf_hpp));
+ DEFINE(__LC_OLDMEM_BASE, offsetof(struct _lowcore, oldmem_base));
+ DEFINE(__LC_OLDMEM_SIZE, offsetof(struct _lowcore, oldmem_size));
#endif /* CONFIG_32BIT */
return 0;
}
--- a/arch/s390/kernel/base.S
+++ b/arch/s390/kernel/base.S
@@ -75,6 +75,43 @@ s390_base_pgm_handler_fn:
.quad 0
.previous

+#
+# Calls diag 308 subcode 1 and continues execution
+#
+# The following conditions must be ensured before calling this function:
+# * Prefix register = 0
+# * Lowcore protection is disabled
+#
+ .globl do_reset_diag308
+do_reset_diag308:
+ larl %r4,.Lctlregs # Save control registers
+ stctg %c0,%c15,0(%r4)
+ larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
+ lghi %r3,0
+ lg %r4,0(%r4) # Save PSW
+ sturg %r4,%r3 # Use sturg, because of large pages
+ lghi %r1,1
+ diag %r1,%r1,0x308
+.Lrestart_part2:
+ lhi %r0,0 # Load r0 with zero
+ lhi %r1,2 # Use mode 2 = ESAME (dump)
+ sigp %r1,%r0,0x12 # Switch to ESAME mode
+ sam64 # Switch to 64 bit addressing mode
+ larl %r4,.Lctlregs # Restore control registers
+ lctlg %c0,%c15,0(%r4)
+ br %r14
+.align 16
+.Lrestart_psw:
+ .long 0x00080000,0x80000000 + .Lrestart_part2
+
+ .section .bss
+.align 8
+.Lctlregs:
+ .rept 16
+ .quad 0
+ .endr
+ .previous
+
#else /* CONFIG_64BIT */

.globl s390_base_mcck_handler
--- /dev/null
+++ b/arch/s390/kernel/crash_dump.c
@@ -0,0 +1,76 @@
+/*
+ * S390 kdump implementation
+ *
+ * Copyright IBM Corp. 2011
+ * Author(s): Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/crash_dump.h>
+#include <asm/lowcore.h>
+
+/*
+ * Copy one page from "oldmem"
+ *
+ * For the kdump reserved memory this functions performs a swap operation:
+ * - [kdump_base - kdump_base + kdump_size] is mapped to [0 - kdump_size].
+ * - [0 - kdump_size] is mapped to [kdump_base - kdump_base + kdump_size]
+ */
+ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
+ size_t csize, unsigned long offset, int userbuf)
+{
+ unsigned long src, kdump_base, kdump_size;
+ int rc;
+
+ if (!csize)
+ return 0;
+
+ kdump_base = oldmem_base;
+ kdump_size = oldmem_size;
+
+ src = (pfn << PAGE_SHIFT) + offset;
+ if (src < kdump_size)
+ src += kdump_base;
+ else if (src > kdump_base &&
+ src < kdump_base + kdump_size)
+ src -= kdump_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;
+}
+
+/*
+ * Read memory from oldmem
+ */
+ssize_t crash_read_from_oldmem(void *buf, size_t count, u64 ppos, int userbuf)
+{
+ unsigned long pfn, offset;
+ ssize_t read = 0, tmp;
+ size_t nr_bytes;
+
+ if (!count)
+ return 0;
+
+ offset = (unsigned long)(ppos % PAGE_SIZE);
+ pfn = (unsigned long)(ppos / PAGE_SIZE);
+
+ do {
+ if (count > (PAGE_SIZE - offset))
+ nr_bytes = PAGE_SIZE - offset;
+ else
+ nr_bytes = count;
+
+ tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf);
+ if (tmp < 0)
+ return tmp;
+ count -= nr_bytes;
+ buf += nr_bytes;
+ read += nr_bytes;
+ ++pfn;
+ offset = 0;
+ } while (count);
+
+ return read;
+}
--- /dev/null
+++ b/arch/s390/kernel/crash_dump_elf.c
@@ -0,0 +1,434 @@
+/*
+ * S390 kdump implementation - Create ELF core header
+ *
+ * Copyright IBM Corp. 2011
+ *
+ * Author(s): Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
+ */
+
+#define KMSG_COMPONENT "kdump"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#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 HDR_PER_CPU_SIZE 0x300
+#define HDR_PER_MEMC_SIZE 0x100
+#define HDR_BASE_SIZE 0x2000
+
+#define ROUNDUP(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
+#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))))
+
+#ifndef ELFOSABI_SYSV
+#define ELFOSABI_SYSV 0
+#endif
+
+#ifndef EI_ABIVERSION
+#define EI_ABIVERSION 8
+#endif
+
+#ifndef NT_FPREGSET
+#define NT_FPREGSET 2
+#endif
+
+/*
+ * prstatus ELF Note
+ */
+struct nt_prstatus_64 {
+ u8 pad1[32];
+ u32 pr_pid;
+ u8 pad2[76];
+ u64 psw[2];
+ u64 gprs[16];
+ u32 acrs[16];
+ u64 orig_gpr2;
+ u32 pr_fpvalid;
+ u8 pad3[4];
+} __packed;
+
+/*
+ * fpregset ELF Note
+ */
+struct nt_fpregset_64 {
+ u32 fpc;
+ u32 pad;
+ u64 fprs[16];
+} __packed;
+
+/*
+ * prpsinfo ELF Note
+ */
+struct nt_prpsinfo_64 {
+ char pr_state;
+ char pr_sname;
+ char pr_zomb;
+ char pr_nice;
+ u64 pr_flag;
+ u32 pr_uid;
+ u32 pr_gid;
+ u32 pr_pid, pr_ppid, pr_pgrp, pr_sid;
+ char pr_fname[16];
+ char pr_psargs[80];
+};
+
+/*
+ * File local static data
+ */
+static struct {
+ void *hdr;
+ u32 hdr_size;
+ int mem_chunk_cnt;
+} l;
+
+/*
+ * Create all required memory holes
+ */
+static void create_mem_holes(struct mem_chunk chunk_array[])
+{
+ create_mem_hole(chunk_array, oldmem_base, oldmem_size, CHUNK_CRASHK);
+}
+
+/*
+ * Alloc memory and panic in case of alloc failure
+ */
+static void *zg_alloc(int len)
+{
+ void *rc;
+
+ rc = kzalloc(len, GFP_KERNEL);
+ if (!rc)
+ panic("crash_dump_elf: alloc failed");
+ return rc;
+}
+
+/*
+ * Calculate CPUs count for dump
+ */
+static int 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;
+}
+
+/*
+ * Calculate memory chunk count
+ */
+static int mem_chunk_cnt(void)
+{
+ struct mem_chunk *chunk_array, *mem_chunk;
+ int i, cnt = 0;
+
+ chunk_array = zg_alloc(MEMORY_CHUNKS * sizeof(struct mem_chunk));
+ detect_memory_layout(chunk_array);
+ create_mem_holes(chunk_array);
+ 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;
+}
+
+/*
+ * Initialize ELF header
+ */
+static void *ehdr_init(Elf64_Ehdr *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;
+ ehdr->e_ident[EI_OSABI] = ELFOSABI_SYSV;
+ ehdr->e_ident[EI_ABIVERSION] = 0;
+ 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_entry = 0;
+ ehdr->e_phoff = sizeof(Elf64_Ehdr);
+ ehdr->e_shoff = 0;
+ ehdr->e_flags = 0;
+ ehdr->e_ehsize = sizeof(Elf64_Ehdr);
+ ehdr->e_phentsize = sizeof(Elf64_Phdr);
+ ehdr->e_shentsize = 0;
+ ehdr->e_shnum = 0;
+ ehdr->e_shstrndx = 0;
+ ehdr->e_phnum = l.mem_chunk_cnt + 1;
+ return ehdr + 1;
+}
+
+/*
+ * Initialize ELF loads
+ */
+static int loads_init(Elf64_Phdr *phdr, u64 loads_offset)
+{
+ struct mem_chunk *chunk_array, *mem_chunk;
+ int i;
+
+ chunk_array = zg_alloc(MEMORY_CHUNKS * sizeof(struct mem_chunk));
+ detect_memory_layout(chunk_array);
+ create_mem_holes(chunk_array);
+ 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 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 *cpu)
+{
+ struct nt_prstatus_64 nt_prstatus;
+ static int cpu_nr = 1;
+
+ memset(&nt_prstatus, 0, sizeof(nt_prstatus));
+ memcpy(&nt_prstatus.gprs, cpu->gp_regs, sizeof(cpu->gp_regs));
+ memcpy(&nt_prstatus.psw, cpu->psw, sizeof(cpu->psw));
+ memcpy(&nt_prstatus.acrs, cpu->acc_regs, sizeof(cpu->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 *cpu)
+{
+ struct nt_fpregset_64 nt_fpregset;
+
+ memset(&nt_fpregset, 0, sizeof(nt_fpregset));
+ memcpy(&nt_fpregset.fpc, &cpu->fp_ctrl_reg, sizeof(cpu->fp_ctrl_reg));
+ memcpy(&nt_fpregset.fprs, &cpu->fp_regs, sizeof(cpu->fp_regs));
+
+ return nt_init(ptr, NT_FPREGSET, &nt_fpregset, sizeof(nt_fpregset),
+ "CORE");
+}
+
+/*
+ * Initialize timer note
+ */
+static void *nt_s390_timer(void *ptr, struct save_area *cpu)
+{
+ return nt_init(ptr, NT_S390_TIMER, &cpu->timer, sizeof(cpu->timer),
+ "LINUX");
+}
+
+/*
+ * Initialize TOD clock comparator note
+ */
+static void *nt_s390_tod_cmp(void *ptr, struct save_area *cpu)
+{
+ return nt_init(ptr, NT_S390_TODCMP, &cpu->clk_cmp,
+ sizeof(cpu->clk_cmp), "LINUX");
+}
+
+/*
+ * Initialize TOD programmable register note
+ */
+static void *nt_s390_tod_preg(void *ptr, struct save_area *cpu)
+{
+ return nt_init(ptr, NT_S390_TODPREG, &cpu->tod_reg,
+ sizeof(cpu->tod_reg), "LINUX");
+}
+
+/*
+ * Initialize control register note
+ */
+static void *nt_s390_ctrs(void *ptr, struct save_area *cpu)
+{
+ return nt_init(ptr, NT_S390_CTRS, &cpu->ctrl_regs,
+ sizeof(cpu->ctrl_regs), "LINUX");
+}
+
+/*
+ * Initialize prefix register note
+ */
+static void *nt_s390_prefix(void *ptr, struct save_area *cpu)
+{
+ return nt_init(ptr, NT_S390_PREFIX, &cpu->pref_reg,
+ sizeof(cpu->pref_reg), "LINUX");
+}
+
+/*
+ * Initialize prpsinfo note
+ */
+static void *nt_prpsinfo(void *ptr)
+{
+ struct nt_prpsinfo_64 prpsinfo;
+
+ memset(&prpsinfo, 0, sizeof(prpsinfo));
+ prpsinfo.pr_state = 0;
+ prpsinfo.pr_sname = 'R';
+ prpsinfo.pr_zomb = 0;
+ strcpy(prpsinfo.pr_fname, "vmlinux");
+
+ return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo), "CORE");
+}
+
+/*
+ * Initialize vmcoreinfo note
+ */
+static void *nt_vmcoreinfo(void *ptr)
+{
+ struct meminfo meminfo_vmcoreinfo;
+ char note_name[11];
+ unsigned long addr;
+ char *vmcoreinfo;
+ Elf64_Nhdr note;
+
+ if (meminfo_old_get(MEMINFO_TYPE_VMCOREINFO, &meminfo_vmcoreinfo))
+ return ptr;
+ addr = meminfo_vmcoreinfo.addr;
+ memset(note_name, 0, sizeof(note_name));
+ crash_read_from_oldmem(&note, sizeof(note), addr, 0);
+ crash_read_from_oldmem(note_name, sizeof(note_name) - 1,
+ addr + sizeof(note), 0);
+ if (strcmp(note_name, "VMCOREINFO") != 0)
+ return ptr;
+ vmcoreinfo = zg_alloc(note.n_descsz + 1);
+ crash_read_from_oldmem(vmcoreinfo, note.n_descsz, addr + 24, 0);
+ vmcoreinfo[note.n_descsz + 1] = 0;
+
+ return nt_init(ptr, 0, vmcoreinfo, note.n_descsz, "VMCOREINFO");
+}
+
+/*
+ * Initialize notes
+ */
+static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset)
+{
+ struct save_area *cpu;
+ void *ptr_start = ptr;
+ int i;
+
+ ptr = nt_prpsinfo(ptr);
+
+ for (i = 0; zfcpdump_save_areas[i]; i++) {
+ cpu = zfcpdump_save_areas[i];
+ if (cpu->pref_reg == 0)
+ continue;
+ ptr = nt_prstatus(ptr, cpu);
+ ptr = nt_fpregset(ptr, cpu);
+ ptr = nt_s390_timer(ptr, cpu);
+ ptr = nt_s390_tod_cmp(ptr, cpu);
+ ptr = nt_s390_tod_preg(ptr, cpu);
+ ptr = nt_s390_ctrs(ptr, cpu);
+ ptr = nt_s390_prefix(ptr, cpu);
+ }
+ ptr = nt_vmcoreinfo(ptr);
+ memset(phdr, 0, sizeof(*phdr));
+ phdr->p_type = PT_NOTE;
+ phdr->p_offset = notes_offset;
+ phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start);
+ phdr->p_memsz = phdr->p_filesz;
+ return ptr;
+}
+
+/*
+ * Initialize ELF header for kdump
+ */
+static void setup_kdump_elf_hdr(void)
+{
+ Elf64_Phdr *phdr_notes, *phdr_loads;
+ u32 alloc_size;
+ u64 hdr_off;
+ void *ptr;
+
+ if (!is_kdump_kernel())
+ return;
+ l.mem_chunk_cnt = mem_chunk_cnt();
+
+ alloc_size = HDR_BASE_SIZE + cpu_cnt() * HDR_PER_CPU_SIZE +
+ l.mem_chunk_cnt * HDR_PER_MEMC_SIZE;
+ l.hdr = zg_alloc(alloc_size);
+ /* Init elf header */
+ ptr = ehdr_init(l.hdr);
+ /* Init program headers */
+ phdr_notes = ptr;
+ ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr));
+ phdr_loads = ptr;
+ ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * l.mem_chunk_cnt);
+ /* Init notes */
+ hdr_off = PTR_DIFF(ptr, l.hdr);
+ ptr = notes_init(phdr_notes, ptr, hdr_off);
+ /* Init loads */
+ hdr_off = PTR_DIFF(ptr, l.hdr);
+ loads_init(phdr_loads, hdr_off);
+ l.hdr_size = hdr_off;
+ BUG_ON(l.hdr_size > alloc_size);
+}
+
+/*
+ * Get ELF header - called from vmcore common code
+ */
+int arch_vmcore_get_elf_hdr(char **elfcorebuf, size_t *elfcorebuf_sz)
+{
+ if (!l.hdr)
+ setup_kdump_elf_hdr();
+ *elfcorebuf = l.hdr;
+ *elfcorebuf_sz = l.hdr_size;
+ return 0;
+}
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -20,6 +20,7 @@
#include <linux/pfn.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
+#include <linux/crash_dump.h>
#include <asm/ebcdic.h>
#include <asm/ipl.h>
#include <asm/lowcore.h>
@@ -29,6 +30,7 @@
#include <asm/sysinfo.h>
#include <asm/cpcmd.h>
#include <asm/sclp.h>
+#include <asm/asm-offsets.h>
#include "entry.h"

/*
@@ -453,6 +455,14 @@ static void __init setup_boot_command_li
append_to_cmdline(append_ipl_scpdata);
}

+static void __init setup_kdump(void)
+{
+#ifdef CONFIG_CRASH_DUMP
+ if (!oldmem_base)
+ return;
+ elfcorehdr_addr = ELFCORE_ADDR_NEWMEM; /* needed for is_kdump_kernel */
+#endif
+}

/*
* Save ipl parameters, clear bss memory, initialize storage keys
@@ -460,6 +470,8 @@ static void __init setup_boot_command_li
*/
void __init startup_init(void)
{
+ meminfo_init();
+ setup_kdump();
reset_tod_clock();
ipl_save_parameters();
rescue_initrd();
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -859,6 +859,34 @@ restart_crash:
restart_go:
#endif

+#
+# PSW restart interrupt handler
+#
+ .globl psw_restart_int_handler
+psw_restart_int_handler:
+ st %r15,__LC_SAVE_AREA_64(%r0) # save r15
+ basr %r15,0
+0: l %r15,.Lrestart_stack-0b(%r15) # load restart stack
+ l %r15,0(%r15)
+ ahi %r15,-SP_SIZE # make room for pt_regs
+ stm %r0,%r14,SP_R0(%r15) # store gprs %r0-%r14 to stack
+ mvc SP_R15(4,%r15),__LC_SAVE_AREA_64(%r0)# store saved %r15 to stack
+ mvc SP_PSW(8,%r15),__LC_RST_OLD_PSW(%r0) # store restart old psw
+ xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # set backchain to 0
+ basr %r14,0
+1: l %r14,.Ldo_restart-1b(%r14)
+ basr %r14,%r14
+
+ basr %r14,0 # load disabled wait PSW if
+2: lpsw restart_psw_crash-2b(%r14) # do_restart returns
+.Ldo_restart:
+ .long do_restart
+.Lrestart_stack:
+ .long restart_stack
+ .align 8
+restart_psw_crash:
+ .long 0x000a0000,0x00000000 + restart_psw_crash
+
.section .kprobes.text, "ax"

#ifdef CONFIG_CHECK_STACK
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -862,6 +862,27 @@ restart_crash:
restart_go:
#endif

+#
+# PSW restart interrupt handler
+#
+ .globl psw_restart_int_handler
+psw_restart_int_handler:
+ stg %r15,__LC_SAVE_AREA_64(%r0) # save r15
+ larl %r15,restart_stack # load restart stack
+ lg %r15,0(%r15)
+ aghi %r15,-SP_SIZE # make room for pt_regs
+ stmg %r0,%r14,SP_R0(%r15) # store gprs %r0-%r14 to stack
+ mvc SP_R15(8,%r15),__LC_SAVE_AREA_64(%r0)# store saved %r15 to stack
+ mvc SP_PSW(16,%r15),__LC_RST_OLD_PSW(%r0)# store restart old psw
+ xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # set backchain to 0
+ brasl %r14,do_restart
+
+ larl %r14,restart_psw_crash # load disabled wait PSW if
+ lpswe 0(%r14) # do_restart returns
+ .align 8
+restart_psw_crash:
+ .quad 0x0002000080000000,0x0000000000000000 + restart_psw_crash
+
.section .kprobes.text, "ax"

#ifdef CONFIG_CHECK_STACK
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -450,10 +450,22 @@ start:
.org 0x10000
.globl startup
startup:
+ j .Lep_startup_normal
+
+#
+# kdump startup-code at 0x10008, running in 64 bit absolute addressing mode
+#
+ .org 0x10008
+ .globl startup_kdump
+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)
@@ -535,6 +547,8 @@ startup:
.align 8
5: .long 0x7fffffff,0xffffffff

+#include "head_kdump.S"
+
#
# params at 10400 (setup.h)
#
--- /dev/null
+++ b/arch/s390/kernel/head_kdump.S
@@ -0,0 +1,133 @@
+/*
+ * S390 kdump lowlevel functions (new kernel)
+ *
+ * Copyright IBM Corp. 2011
+ * Author(s): Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
+ */
+
+#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:
+ 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:
+ lg %r4,__LC_MEMINFO+__MI_ADDR(%r0) # Load meminfo base (%r4)
+
+ lgr %r5,%r4
+ aghi %r5,__MI_TYPE_KDUMP_MEM # Base for kdump meminfo
+ lg %r2,__MI_ADDR(%r5) # Load kdump base address (%r2)
+ lg %r3,__MI_SIZE(%r5) # Load kdump size (%r3)
+
+ stg %r2,__LC_OLDMEM_BASE(%r2) # Save kdump base
+ stg %r3,__LC_OLDMEM_SIZE(%r2) # Save 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: lg %r3,__LC_OLDMEM_BASE(%r0) # Save oldmem base
+ stg %r3,oldmem_base-0b(%r13)
+ lg %r3,__LC_OLDMEM_SIZE(%r0) # Save oldmem size
+ stg %r3,oldmem_size-0b(%r13)
+
+ 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
+ .globl oldmem_base
+oldmem_base:
+ .quad 0x0
+ .globl oldmem_size
+oldmem_size:
+ .quad 0x0
+
+#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 */
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -16,6 +16,7 @@
#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>
@@ -26,6 +27,7 @@
#include <asm/sclp.h>
#include <asm/sigp.h>
#include <asm/checksum.h>
+#include <asm/lowcore.h>

#define IPL_PARM_BLOCK_VERSION 0

@@ -45,11 +47,13 @@
* - halt
* - power off
* - reipl
+ * - restart
*/
#define ON_PANIC_STR "on_panic"
#define ON_HALT_STR "on_halt"
#define ON_POFF_STR "on_poff"
#define ON_REIPL_STR "on_reboot"
+#define ON_RESTART_STR "on_restart"

struct shutdown_action;
struct shutdown_trigger {
@@ -66,6 +70,7 @@ struct shutdown_trigger {
#define SHUTDOWN_ACTION_VMCMD_STR "vmcmd"
#define SHUTDOWN_ACTION_STOP_STR "stop"
#define SHUTDOWN_ACTION_DUMP_REIPL_STR "dump_reipl"
+#define SHUTDOWN_ACTION_KDUMP_STR "kdump"

struct shutdown_action {
char *name;
@@ -946,6 +951,13 @@ static struct attribute_group reipl_nss_
.attrs = reipl_nss_attrs,
};

+static void set_reipl_block_actual(struct ipl_parameter_block *reipl_block)
+{
+ meminfo_update(MEMINFO_TYPE_IPIB, reipl_block, reipl_block->hdr.len,
+ MEMINFO_FLAG_ELEM_VALID | MEMINFO_FLAG_CSUM_VALID);
+ reipl_block_actual = reipl_block;
+}
+
/* reipl type */

static int reipl_set_type(enum ipl_type type)
@@ -961,7 +973,7 @@ static int reipl_set_type(enum ipl_type
reipl_method = REIPL_METHOD_CCW_VM;
else
reipl_method = REIPL_METHOD_CCW_CIO;
- reipl_block_actual = reipl_block_ccw;
+ set_reipl_block_actual(reipl_block_ccw);
break;
case IPL_TYPE_FCP:
if (diag308_set_works)
@@ -970,7 +982,7 @@ static int reipl_set_type(enum ipl_type
reipl_method = REIPL_METHOD_FCP_RO_VM;
else
reipl_method = REIPL_METHOD_FCP_RO_DIAG;
- reipl_block_actual = reipl_block_fcp;
+ set_reipl_block_actual(reipl_block_fcp);
break;
case IPL_TYPE_FCP_DUMP:
reipl_method = REIPL_METHOD_FCP_DUMP;
@@ -980,7 +992,7 @@ static int reipl_set_type(enum ipl_type
reipl_method = REIPL_METHOD_NSS_DIAG;
else
reipl_method = REIPL_METHOD_NSS;
- reipl_block_actual = reipl_block_nss;
+ set_reipl_block_actual(reipl_block_nss);
break;
case IPL_TYPE_UNKNOWN:
reipl_method = REIPL_METHOD_DEFAULT;
@@ -1111,6 +1123,12 @@ static void reipl_block_ccw_init(struct
static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
{
/* LOADPARM */
+ /* For kdump we use IPL parameters from original system */
+ if (is_kdump_kernel()) {
+ memcpy(ipb->ipl_info.ccw.load_parm,
+ ipl_block.ipl_info.ccw.load_parm, LOADPARM_LEN);
+ return;
+ }
/* check if read scp info worked and set loadparm */
if (sclp_ipl_info.is_valid)
memcpy(ipb->ipl_info.ccw.load_parm,
@@ -1495,30 +1513,10 @@ static struct shutdown_action __refdata

static void dump_reipl_run(struct shutdown_trigger *trigger)
{
- preempt_disable();
- /*
- * Bypass dynamic address translation (DAT) when storing IPL parameter
- * information block address and checksum into the prefix area
- * (corresponding to absolute addresses 0-8191).
- * When enhanced DAT applies and the STE format control in one,
- * the absolute address is formed without prefixing. In this case a
- * normal store (stg/st) into the prefix area would no more match to
- * absolute addresses 0-8191.
- */
-#ifdef CONFIG_64BIT
- asm volatile("sturg %0,%1"
- :: "a" ((unsigned long) reipl_block_actual),
- "a" (&lowcore_ptr[smp_processor_id()]->ipib));
-#else
- asm volatile("stura %0,%1"
- :: "a" ((unsigned long) reipl_block_actual),
- "a" (&lowcore_ptr[smp_processor_id()]->ipib));
-#endif
- asm volatile("stura %0,%1"
- :: "a" (csum_partial(reipl_block_actual,
- reipl_block_actual->hdr.len, 0)),
- "a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum));
- preempt_enable();
+ u32 csum;
+
+ csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
+ copy_to_absolute_zero(&S390_lowcore.ipib_checksum, &csum, sizeof(csum));
dump_run(trigger);
}

@@ -1544,17 +1542,20 @@ static char vmcmd_on_reboot[128];
static char vmcmd_on_panic[128];
static char vmcmd_on_halt[128];
static char vmcmd_on_poff[128];
+static char vmcmd_on_restart[128];

DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
+DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);

static struct attribute *vmcmd_attrs[] = {
&sys_vmcmd_on_reboot_attr.attr,
&sys_vmcmd_on_panic_attr.attr,
&sys_vmcmd_on_halt_attr.attr,
&sys_vmcmd_on_poff_attr.attr,
+ &sys_vmcmd_on_restart_attr.attr,
NULL,
};

@@ -1576,6 +1577,8 @@ static void vmcmd_run(struct shutdown_tr
cmd = vmcmd_on_halt;
else if (strcmp(trigger->name, ON_POFF_STR) == 0)
cmd = vmcmd_on_poff;
+ else if (strcmp(trigger->name, ON_RESTART_STR) == 0)
+ cmd = vmcmd_on_restart;
else
return;

@@ -1621,11 +1624,43 @@ static void stop_run(struct shutdown_tri
static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
stop_run, NULL};

+/*
+ * kdump shutdown action: Trigger kdump on shutdown.
+ */
+
+#ifdef CONFIG_CRASH_DUMP
+static int kdump_init(void)
+{
+ if (crashk_res.start == 0)
+ return -EOPNOTSUPP;
+ return 0;
+}
+
+static void kdump_run(struct shutdown_trigger *trigger)
+{
+ /*
+ * We do not call crash_kexec(), because the image could also
+ * be loaded externally without kexec_load(). In this case
+ * crash_kexec() would have no effect because crash_image is not
+ * defined.
+ */
+ machine_kdump();
+ disabled_wait((unsigned long) __builtin_return_address(0));
+}
+
+static struct shutdown_action kdump_action = {SHUTDOWN_ACTION_KDUMP_STR,
+ kdump_run, kdump_init};
+#endif
+
/* action list */

static struct shutdown_action *shutdown_actions_list[] = {
&ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
- &vmcmd_action, &stop_action};
+ &vmcmd_action, &stop_action,
+#ifdef CONFIG_CRASH_DUMP
+ &kdump_action
+#endif
+ };
#define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))

/*
@@ -1707,6 +1742,34 @@ static void do_panic(void)
stop_run(&on_panic_trigger);
}

+/* on restart */
+
+static struct shutdown_trigger on_restart_trigger = {ON_RESTART_STR,
+ &reipl_action};
+
+static ssize_t on_restart_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *page)
+{
+ return sprintf(page, "%s\n", on_restart_trigger.action->name);
+}
+
+static ssize_t on_restart_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t len)
+{
+ return set_trigger(buf, &on_restart_trigger, len);
+}
+
+static struct kobj_attribute on_restart_attr =
+ __ATTR(on_restart, 0644, on_restart_show, on_restart_store);
+
+void do_restart(void)
+{
+ smp_send_stop();
+ on_restart_trigger.action->fn(&on_restart_trigger);
+ stop_run(&on_restart_trigger);
+}
+
/* on halt */

static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
@@ -1767,6 +1830,16 @@ void (*_machine_power_off)(void) = do_ma

static void __init shutdown_triggers_init(void)
{
+#ifdef CONFIG_CRASH_DUMP
+ /*
+ * We set the kdump action for panic and restart, if the kdump
+ * reserved area is defined.
+ */
+ if (crashk_res.start != 0) {
+ on_restart_trigger.action = &kdump_action;
+ on_panic_trigger.action = &kdump_action;
+ }
+#endif
shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
firmware_kobj);
if (!shutdown_actions_kset)
@@ -1783,7 +1856,9 @@ static void __init shutdown_triggers_ini
if (sysfs_create_file(&shutdown_actions_kset->kobj,
&on_poff_attr.attr))
goto fail;
-
+ if (sysfs_create_file(&shutdown_actions_kset->kobj,
+ &on_restart_attr.attr))
+ goto fail;
return;
fail:
panic("shutdown_triggers_init failed\n");
@@ -1908,6 +1983,26 @@ void __init setup_ipl(void)
atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
}

+/*
+ * In case of kdump get re-IPL configuration of crashed system via meminfo
+ */
+static int __init ipl_kdump_ipib_init(void)
+{
+#ifdef CONFIG_CRASH_DUMP
+ struct meminfo meminfo_ipib;
+
+ if (!is_kdump_kernel())
+ return -EINVAL;
+ if (meminfo_old_get(MEMINFO_TYPE_IPIB, &meminfo_ipib))
+ return -EINVAL;
+ crash_read_from_oldmem(&ipl_block, sizeof(ipl_block),
+ meminfo_ipib.addr, 0);
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
void __init ipl_update_parameters(void)
{
int rc;
@@ -1915,6 +2010,35 @@ void __init ipl_update_parameters(void)
rc = diag308(DIAG308_STORE, &ipl_block);
if ((rc == DIAG308_RC_OK) || (rc == DIAG308_RC_NOCONFIG))
diag308_set_works = 1;
+ ipl_kdump_ipib_init();
+}
+
+/*
+ * For kdump IPL we set the IPL info to the values that get from the crashed
+ * system using the ipib meminfo pointer. Then a reboot of the kdump
+ * kernel will reboot the original system.
+ */
+static int setup_kdump_iplinfo(struct cio_iplinfo *iplinfo)
+{
+#ifdef CONFIG_CRASH_DUMP
+ if (ipl_kdump_ipib_init())
+ return -EINVAL;
+
+ if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW) {
+ iplinfo->devno = ipl_block.ipl_info.ccw.devno;
+ iplinfo->is_qdio = 0;
+ return 0;
+ }
+ if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP) {
+ iplinfo->devno = ipl_block.ipl_info.fcp.devno;
+ iplinfo->is_qdio = 1;
+ S390_lowcore.ipl_parmblock_ptr = (unsigned long) &ipl_block;
+ return 0;
+ }
+ return -ENODEV;
+#else
+ return -ENODEV;
+#endif
}

void __init ipl_save_parameters(void)
@@ -1922,9 +2046,13 @@ void __init ipl_save_parameters(void)
struct cio_iplinfo iplinfo;
void *src, *dst;

- if (cio_get_iplinfo(&iplinfo))
- return;
-
+ if (is_kdump_kernel()) {
+ if (setup_kdump_iplinfo(&iplinfo))
+ return;
+ } else {
+ if (cio_get_iplinfo(&iplinfo))
+ return;
+ }
ipl_devno = iplinfo.devno;
ipl_flags |= IPL_DEVNO_VALID;
if (!iplinfo.is_qdio)
@@ -1992,7 +2120,10 @@ void s390_reset_system(void)
S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
S390_lowcore.program_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
-
- do_reset_calls();
+#ifdef CONFIG_64BIT
+ if (diag308_set_works)
+ do_reset_diag308();
+ else
+#endif
+ do_reset_calls();
}
-
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -21,12 +21,169 @@
#include <asm/smp.h>
#include <asm/reset.h>
#include <asm/ipl.h>
+#include <asm/cacheflush.h>
+#include <asm/asm-offsets.h>
+#include <asm/checksum.h>
+#include <asm/diag.h>
+#include <asm/sclp.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
+
+static struct meminfo meminfo_kdump_segments[KEXEC_SEGMENT_MAX];
+
+/*
+ * S390 version: Currently we do not support freeing crashkernel memory
+ */
+void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
+{
+ return;
+}
+
+/*
+ * S390 version: Just do real copy of segment
+ */
+int kimage_load_crash_segment(struct kimage *image,
+ struct kexec_segment *segment)
+{
+ return copy_from_user_real((void *) segment->mem, segment->buf,
+ segment->bufsz);
+}
+
+/*
+ * Update KDUMP_MEM meminfo and store oldmem base and size to absolute zero
+ */
+static void kdump_mem_update(void)
+{
+ unsigned long base, size;
+
+ base = crashk_res.start;
+ size = crashk_res.end - crashk_res.start + 1;
+ memcpy_real((void *) __LC_OLDMEM_BASE + base, &base, sizeof(base));
+ memcpy_real((void *) __LC_OLDMEM_SIZE + base, &size, sizeof(size));
+ meminfo_update(MEMINFO_TYPE_KDUMP_MEM, (void *) base, size,
+ MEMINFO_FLAG_ELEM_VALID);
+}
+
+/*
+ * Clear kdump segments (kdump has been unloaded)
+ */
+static void kdump_segments_clear(void)
+{
+ memset(meminfo_kdump_segments, 0, sizeof(meminfo_kdump_segments));
+ meminfo_update(MEMINFO_TYPE_KDUMP_SEGM, NULL, 0, 0);
+ if (MACHINE_IS_VM)
+ diag10_range(PFN_DOWN(crashk_res.start),
+ PFN_DOWN(crashk_res.end - crashk_res.start + 1));
+}
+
+/*
+ * Update kdump segments (kdump has been loaded)
+ */
+static void kdump_segments_update(struct kimage *image)
+{
+ int i, flags = MEMINFO_FLAG_ELEM_VALID | MEMINFO_FLAG_CSUM_VALID;
+
+ memset(meminfo_kdump_segments, 0, sizeof(meminfo_kdump_segments));
+
+ for (i = 0; i < image->nr_segments; i++) {
+ meminfo_kdump_segments[i].addr = image->segment[i].mem;
+ meminfo_kdump_segments[i].size = image->segment[i].memsz;
+ meminfo_kdump_segments[i].flags = flags;
+ }
+
+ meminfo_update(MEMINFO_TYPE_KDUMP_SEGM, &meminfo_kdump_segments,
+ image->nr_segments * sizeof(struct meminfo),
+ flags | MEMINFO_FLAG_ELEM_IND);
+}
+
+/*
+ * Finish kexec_load() and update meminfo data in case of kdump
+ */
+void machine_kexec_finish(struct kimage *image, int kexec_flags)
+{
+ if (!(kexec_flags & KEXEC_ON_CRASH))
+ return;
+ kdump_mem_update();
+ if (image)
+ kdump_segments_update(image);
+ else
+ kdump_segments_clear();
+}
+
+/*
+ * Print error message and load disabled wait PSW
+ */
+static void kdump_failed(const char *str)
+{
+ psw_t kdump_failed_psw;
+
+ kdump_failed_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
+ kdump_failed_psw.addr = (unsigned long) kdump_failed;
+ _sclp_print_early(str);
+ _sclp_print_early("Please use alternative dump tool");
+ __load_psw(kdump_failed_psw);
+}
+
+/*
+ * Check if kdump is loaded/valid and start it
+ */
+static void __machine_kdump(void *data)
+{
+ u32 flags = meminfo_array[MEMINFO_TYPE_KDUMP_SEGM].flags;
+ struct meminfo root;
+ psw_t kdump_psw;
+ u32 csum;
+
+ pfault_fini();
+ s390_reset_system();
+ __arch_local_irq_stnsm(0xfb); /* disable DAT */
+ do_store_status();
+
+ if (!(flags & MEMINFO_FLAG_ELEM_VALID))
+ kdump_failed("kdump failed: Kernel not loaded");
+
+ copy_from_absolute_zero(&root, &S390_lowcore.meminfo, sizeof(root));
+ copy_from_absolute_zero(&csum, &S390_lowcore.meminfo_csum,
+ sizeof(csum));
+ if (csum != csum_partial(&root, sizeof(root), 0))
+ kdump_failed("kdump failed: Invalid meminfo checksum");
+ if (meminfo_csum_check(&root, 1))
+ kdump_failed("kdump failed: Invalid checksum");
+
+ _sclp_print_early("Starting kdump");
+ kdump_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ kdump_psw.addr = crashk_res.start + 0x10008;
+ __load_psw(kdump_psw);
+}
+
+/*
+ * Start kdump on IPL CPU
+ */
+void machine_kdump(void)
+{
+ crash_save_vmcoreinfo();
+ smp_switch_to_ipl_cpu(__machine_kdump, NULL);
+}
+#endif
+
+/*
+ * Invalidate KDUMP_SEGM meminfo before new kdump is loaded
+ */
+static int machine_kexec_prepare_kdump(void)
+{
+#ifdef CONFIG_CRASH_DUMP
+ kdump_segments_clear();
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
int machine_kexec_prepare(struct kimage *image)
{
void *reboot_code_buffer;
@@ -35,6 +192,9 @@ int machine_kexec_prepare(struct kimage
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;
@@ -72,6 +232,10 @@ static void __machine_kexec(void *data)

void machine_kexec(struct kimage *image)
{
+#ifdef CONFIG_CRASH_DUMP
+ if (image->type == KEXEC_TYPE_CRASH)
+ machine_kdump();
+#endif
tracer_disable();
smp_send_stop();
smp_switch_to_ipl_cpu(__machine_kexec, image);
--- a/arch/s390/kernel/mem_detect.c
+++ b/arch/s390/kernel/mem_detect.c
@@ -62,3 +62,73 @@ void detect_memory_layout(struct mem_chu
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;
+ }
+ }
+}
+
--- /dev/null
+++ b/arch/s390/kernel/meminfo.c
@@ -0,0 +1,132 @@
+/*
+ * Store memory information for external users like stand-alone dump tools
+ *
+ * Copyright IBM Corp. 2011
+ * Author(s): Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/lowcore.h>
+#include <asm/checksum.h>
+
+struct meminfo meminfo_array[MEMINFO_TYPE_LAST];
+
+static inline int meminfo_ind_cnt(struct meminfo *meminfo)
+{
+ return meminfo->size / sizeof(struct meminfo);
+}
+
+/*
+ * Recursively update meminfo checksums
+ */
+static void meminfo_csum_update(struct meminfo *meminfo)
+{
+ struct meminfo *child;
+ int i;
+
+ if (!(meminfo->flags & MEMINFO_FLAG_CSUM_VALID))
+ return;
+ if (meminfo->flags & MEMINFO_FLAG_ELEM_IND) {
+ child = (struct meminfo *) meminfo->addr;
+ for (i = 0; i < meminfo_ind_cnt(meminfo); i++) {
+ if (!(child[i].flags & MEMINFO_FLAG_ELEM_VALID))
+ continue;
+ meminfo_csum_update(&child[i]);
+ }
+ }
+ meminfo->csum = csum_partial_real((void *) meminfo->addr,
+ meminfo->size, 0);
+}
+
+/*
+ * Verify checksum for meminfo element(s)
+ */
+int meminfo_csum_check(struct meminfo *meminfo, int recursive)
+{
+ struct meminfo *child;
+ u32 csum;
+ int i;
+
+ if (!(meminfo->flags & MEMINFO_FLAG_CSUM_VALID))
+ return 0;
+ csum = csum_partial_real((void *) meminfo->addr, meminfo->size, 0);
+ if (meminfo->csum != csum)
+ return -EINVAL;
+ if (!recursive)
+ return 0;
+ if (meminfo->flags & MEMINFO_FLAG_ELEM_IND) {
+ child = (struct meminfo *) meminfo->addr;
+ for (i = 0; i < meminfo_ind_cnt(meminfo); i++) {
+ if (!(child[i].flags & MEMINFO_FLAG_ELEM_VALID))
+ continue;
+ if (meminfo_csum_check(&child[i], 1))
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Update root meminfo element and corresponding checksum
+ */
+static void meminfo_update_root(void)
+{
+ struct meminfo root;
+ u32 csum;
+
+ copy_from_absolute_zero(&root, &S390_lowcore.meminfo, sizeof(root));
+ meminfo_csum_update(&root);
+ copy_to_absolute_zero(&S390_lowcore.meminfo, &root, sizeof(root));
+ csum = csum_partial(&root, sizeof(root), 0);
+ copy_to_absolute_zero(&S390_lowcore.meminfo_csum, &csum, sizeof(csum));
+}
+
+/*
+ * Add memory info for given type
+ */
+void meminfo_update(enum meminfo_type type, void *buf, unsigned long size,
+ u32 flags)
+{
+ struct meminfo *meminfo = &meminfo_array[type];
+
+ meminfo->addr = (unsigned long) buf;
+ meminfo->size = size;
+ meminfo->flags = flags;
+ meminfo_update_root();
+}
+
+/*
+ * Init meminfo and setup absolute zero pointer
+ */
+void __init meminfo_init(void)
+{
+ struct meminfo root;
+
+ root.addr = (unsigned long) &meminfo_array,
+ root.size = sizeof(meminfo_array),
+ root.flags = MEMINFO_FLAG_ELEM_VALID | MEMINFO_FLAG_ELEM_IND |
+ MEMINFO_FLAG_CSUM_VALID;
+ copy_to_absolute_zero(&S390_lowcore.meminfo, &root, sizeof(root));
+ meminfo_update_root();
+}
+
+#ifdef CONFIG_CRASH_DUMP
+/*
+ * Get meminfo from old kernel
+ */
+int meminfo_old_get(enum meminfo_type type, struct meminfo *meminfo)
+{
+ struct meminfo root, *meminfo_array_old;
+
+ if (!oldmem_base)
+ return -ENOENT;
+ memcpy_real(&root, (void *) oldmem_base + __LC_MEMINFO, sizeof(root));
+ if (type > meminfo_ind_cnt(&root))
+ return -ENOENT;
+ meminfo_array_old = (struct meminfo *) (oldmem_base + root.addr);
+ memcpy_real(meminfo, &meminfo_array_old[type], sizeof(*meminfo));
+ if (!(meminfo->flags & MEMINFO_FLAG_ELEM_VALID))
+ return -ENOENT;
+ return 0;
+}
+#endif
--- a/arch/s390/kernel/reipl64.S
+++ b/arch/s390/kernel/reipl64.S
@@ -1,5 +1,5 @@
/*
- * Copyright IBM Corp 2000,2009
+ * Copyright IBM Corp 2000,2011
* Author(s): Holger Smolinski <Holger.Smolinski@xxxxxxxxxx>,
* Denis Joseph Barrow,
*/
@@ -7,6 +7,66 @@
#include <asm/asm-offsets.h>

#
+# do_store_status
+#
+# Prerequisites to run this function:
+# - DAT mode is off
+# - Prefix register is set to zero
+# - Original prefix register is stored in "dump_prefix_page"
+# - Lowcore protection is off
+#
+ .globl do_store_status
+do_store_status:
+ /* Save register one and load save area base */
+ stg %r1,__LC_SAVE_AREA_64(%r0)
+ lghi %r1,SAVE_AREA_BASE
+ /* General purpose registers */
+ stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ lg %r2,__LC_SAVE_AREA_64(%r0)
+ stg %r2,__LC_GPREGS_SAVE_AREA-SAVE_AREA_BASE+8(%r1)
+ /* Control registers */
+ stctg %c0,%c15,__LC_CREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Access registers */
+ stam %a0,%a15,__LC_AREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Floating point registers */
+ std %f0, 0x00 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f1, 0x08 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f2, 0x10 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f3, 0x18 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f4, 0x20 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f5, 0x28 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f6, 0x30 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f7, 0x38 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f8, 0x40 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f9, 0x48 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f10,0x50 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f11,0x58 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f12,0x60 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f13,0x68 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f14,0x70 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f15,0x78 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Floating point control register */
+ stfpc __LC_FP_CREG_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* CPU timer */
+ stpt __LC_CPU_TIMER_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Saved prefix register */
+ larl %r2,dump_prefix_page
+ mvc __LC_PREFIX_SAVE_AREA-SAVE_AREA_BASE(4,%r1),0(%r2)
+ /* Clock comparator - seven bytes */
+ larl %r2,.Lclkcmp
+ stckc 0(%r2)
+ mvc __LC_CLOCK_COMP_SAVE_AREA-SAVE_AREA_BASE + 1(7,%r1),1(%r2)
+ /* Program status word */
+ epsw %r2,%r3
+ st %r2,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 0(%r1)
+ st %r3,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 4(%r1)
+ larl %r2,do_store_status
+ stg %r2,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 8(%r1)
+ br %r14
+.align 8
+.Lclkcmp: .quad 0x0000000000000000
+
+#
# do_reipl_asm
# Parameter: r2 = schid of reipl device
#
@@ -14,22 +74,7 @@
.globl do_reipl_asm
do_reipl_asm: basr %r13,0
.Lpg0: lpswe .Lnewpsw-.Lpg0(%r13)
-.Lpg1: # do store status of all registers
-
- stg %r1,.Lregsave-.Lpg0(%r13)
- lghi %r1,0x1000
- stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-0x1000(%r1)
- lg %r0,.Lregsave-.Lpg0(%r13)
- stg %r0,__LC_GPREGS_SAVE_AREA-0x1000+8(%r1)
- stctg %c0,%c15,__LC_CREGS_SAVE_AREA-0x1000(%r1)
- stam %a0,%a15,__LC_AREGS_SAVE_AREA-0x1000(%r1)
- lg %r10,.Ldump_pfx-.Lpg0(%r13)
- mvc __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),0(%r10)
- stfpc __LC_FP_CREG_SAVE_AREA-0x1000(%r1)
- stckc .Lclkcmp-.Lpg0(%r13)
- mvc __LC_CLOCK_COMP_SAVE_AREA-0x1000(7,%r1),.Lclkcmp-.Lpg0(%r13)
- stpt __LC_CPU_TIMER_SAVE_AREA-0x1000(%r1)
- stg %r13, __LC_PSW_SAVE_AREA-0x1000+8(%r1)
+.Lpg1: brasl %r14,do_store_status

lctlg %c6,%c6,.Lall-.Lpg0(%r13)
lgr %r1,%r2
@@ -66,10 +111,7 @@ do_reipl_asm: basr %r13,0
st %r14,.Ldispsw+12-.Lpg0(%r13)
lpswe .Ldispsw-.Lpg0(%r13)
.align 8
-.Lclkcmp: .quad 0x0000000000000000
.Lall: .quad 0x00000000ff000000
-.Ldump_pfx: .quad dump_prefix_page
-.Lregsave: .quad 0x0000000000000000
.align 16
/*
* These addresses have to be 31 bit otherwise
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -42,6 +42,9 @@
#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>
@@ -57,6 +60,7 @@
#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);
@@ -346,7 +350,7 @@ setup_lowcore(void)
lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
lc->restart_psw.addr =
- PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
+ PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
if (user_mode != HOME_SPACE_MODE)
lc->restart_psw.mask |= PSW_ASC_HOME;
lc->external_new_psw.mask = psw_kernel_bits;
@@ -435,6 +439,9 @@ static void __init setup_resources(void)
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) {
@@ -479,6 +486,7 @@ static void __init setup_memory_end(void
unsigned long max_mem;
int i;

+
#ifdef CONFIG_ZFCPDUMP
if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
memory_end = ZFCPDUMP_HSA_SIZE;
@@ -529,6 +537,193 @@ static void __init setup_memory_end(void
memory_end = memory_size;
}

+void *restart_stack __attribute__((__section__(".data")));
+
+/*
+ * Setup new PSW and allocate stack for PSW restart interrupt
+ */
+static void __init setup_restart_psw(void)
+{
+ psw_t psw;
+
+ restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
+ restart_stack += ASYNC_SIZE;
+
+ /*
+ * Setup restart PSW for absolute zero lowcore. This is necesary
+ * if PSW restart is done on an offline CPU that has lowcore zero
+ */
+ psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
+ 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)
+{
+ unsigned long crash_base;
+ struct mem_chunk *chunk;
+ int i;
+
+ 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 = max(chunk->addr, crash_size);
+ crash_base = max(crash_base, ZFCPDUMP_HSA_SIZE_MAX);
+ crash_base = max(crash_base, (unsigned long) INITRD_START +
+ INITRD_SIZE);
+ crash_base = PAGE_ALIGN(crash_base);
+ if (crash_base >= chunk->addr + chunk->size)
+ continue;
+ if (chunk->addr + chunk->size - crash_base < crash_size)
+ continue;
+ crash_base = chunk->size - crash_size;
+ return crash_base;
+ }
+ 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)
+{
+ 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)
+ return -EINVAL;
+
+ /* First memory chunk must be at least crash_size */
+ if (memory_chunk[0].size < crash_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)
+ return -EINVAL;
+ return 0;
+ }
+ 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] 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(crashk_res.end - crashk_res.start + 1))
+ 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 (!is_kdump_kernel())
+ 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;
+ int rc;
+
+ rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
+ &crash_base);
+ if (rc || crash_size == 0)
+ return;
+ if (register_memory_notifier(&kdump_mem_nb))
+ return;
+ if (!crash_base)
+ crash_base = find_crash_base(crash_size);
+ if (!crash_base) {
+ pr_info("crashkernel reservation failed: %s\n",
+ "No suitable area found");
+ unregister_memory_notifier(&kdump_mem_nb);
+ return;
+ }
+ if (verify_crash_base(crash_base, crash_size)) {
+ pr_info("crashkernel reservation failed: %s\n",
+ "Invalid memory range specified");
+ unregister_memory_notifier(&kdump_mem_nb);
+ return;
+ }
+ if (!is_kdump_kernel() && 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);
+ meminfo_update(MEMINFO_TYPE_KDUMP_MEM, (void *) crash_base,
+ crash_size, MEMINFO_FLAG_ELEM_VALID);
+ reserve_kdump_bootmem(crashk_res.start,
+ crashk_res.end - crashk_res.start + 1,
+ CHUNK_CRASHK);
+ 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)
{
@@ -559,6 +754,14 @@ 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 (is_kdump_kernel()) {
+ /* 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) "
@@ -787,11 +990,16 @@ setup_arch(char **cmdline_p)

parse_early_param();

+ meminfo_update(MEMINFO_TYPE_VMCOREINFO, &vmcoreinfo_note,
+ sizeof(vmcoreinfo_note), MEMINFO_FLAG_ELEM_VALID);
setup_ipl();
setup_memory_end();
setup_addressing_mode();
+ reserve_oldmem();
+ reserve_crashkernel();
setup_memory();
setup_resources();
+ setup_restart_psw();
setup_lowcore();

cpu_init();
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -38,6 +38,7 @@
#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>
@@ -281,11 +282,11 @@ void smp_ctl_clear_bit(int cr, int bit)
}
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 && !is_kdump_kernel())
return;
if (cpu >= NR_CPUS) {
pr_warning("CPU %i exceeds the maximum %i and is excluded from "
@@ -403,6 +404,19 @@ static void __init smp_detect_cpus(void)
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)
panic("smp_detect_cpus failed to allocate memory\n");
+
+#ifdef CONFIG_CRASH_DUMP
+ if (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");
+ crash_read_from_oldmem(save_area, sizeof(*save_area),
+ SAVE_AREA_BASE, 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;
@@ -470,6 +484,11 @@ int __cpuinit start_secondary(void *cpuv
ipi_call_unlock();
/* Switch on interrupts */
local_irq_enable();
+ __ctl_clear_bit(0, 28); /* Disable lowcore protection */
+ S390_lowcore.restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ S390_lowcore.restart_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
+ __ctl_set_bit(0, 28); /* Enable lowcore protection */
/* cpu_idle will call schedule for us */
cpu_idle();
return 0;
@@ -507,6 +526,9 @@ static int __cpuinit smp_alloc_lowcore(i
memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
lowcore->async_stack = async_stack + ASYNC_SIZE;
lowcore->panic_stack = panic_stack + PAGE_SIZE;
+ lowcore->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ lowcore->restart_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) restart_int_handler;

#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/gfp.h>
#include <asm/system.h>

/*
@@ -60,6 +61,9 @@ long probe_kernel_write(void *dst, const
return copied < 0 ? -EFAULT : 0;
}

+/*
+ * Copy memory in real mode (kernel to kernel)
+ */
int memcpy_real(void *dest, void *src, size_t count)
{
register unsigned long _dest asm("2") = (unsigned long) dest;
@@ -85,3 +89,82 @@ int memcpy_real(void *dest, void *src, s
arch_local_irq_restore(flags);
return rc;
}
+
+/*
+ * Copy memory from kernel (real) to user (virtual)
+ */
+int copy_to_user_real(void __user *dest, void *src, size_t count)
+{
+ int offs = 0, size, rc;
+ char *buf;
+
+ buf = (char *) __get_free_page(GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ rc = -EFAULT;
+ while (offs < count) {
+ size = min(PAGE_SIZE, count - offs);
+ if (memcpy_real(buf, src + offs, size))
+ goto out;
+ if (copy_to_user(dest + offs, buf, size))
+ goto out;
+ offs += size;
+ }
+ rc = 0;
+out:
+ free_page((unsigned long) buf);
+ return rc;
+}
+
+/*
+ * Copy memory from user (virtual) to kernel (real)
+ */
+int copy_from_user_real(void *dest, void __user *src, size_t count)
+{
+ int offs = 0, size, rc;
+ char *buf;
+
+ buf = (char *) __get_free_page(GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ rc = -EFAULT;
+ while (offs < count) {
+ size = min(PAGE_SIZE, count - offs);
+ if (copy_from_user(buf, src + offs, size))
+ goto out;
+ if (memcpy_real(dest + offs, buf, size))
+ goto out;
+ offs += size;
+ }
+ rc = 0;
+out:
+ free_page((unsigned long) buf);
+ return rc;
+}
+
+/*
+ * Copy memory to absolute zero
+ */
+void copy_to_absolute_zero(void *dest, void *src, size_t count)
+{
+ unsigned long cr0;
+
+ BUG_ON((unsigned long) dest + count >= sizeof(struct _lowcore));
+ preempt_disable();
+ __ctl_store(cr0, 0, 0);
+ __ctl_clear_bit(0, 28); /* disable lowcore protection */
+ memcpy_real(dest + store_prefix(), src, count);
+ __ctl_load(cr0, 0, 0);
+ preempt_enable();
+}
+
+/*
+ * Copy memory from absolute zero
+ */
+void copy_from_absolute_zero(void *dest, void *src, size_t count)
+{
+ BUG_ON((unsigned long) src + count >= sizeof(struct _lowcore));
+ preempt_disable();
+ memcpy_real(dest, src + store_prefix(), count);
+ preempt_enable();
+}
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -335,6 +335,9 @@ void __init vmem_map_init(void)
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)
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -142,22 +142,6 @@ static int memcpy_hsa_kernel(void *dest,
return memcpy_hsa(dest, src, count, TO_KERNEL);
}

-static int memcpy_real_user(void __user *dest, unsigned long src, size_t count)
-{
- static char buf[4096];
- int offs = 0, size;
-
- while (offs < count) {
- size = min(sizeof(buf), count - offs);
- if (memcpy_real(buf, (void *) src + offs, size))
- return -EFAULT;
- if (copy_to_user(dest + offs, buf, size))
- return -EFAULT;
- offs += size;
- }
- return 0;
-}
-
static int __init init_cpu_info(enum arch_id arch)
{
struct save_area *sa;
@@ -346,8 +330,8 @@ static ssize_t zcore_read(struct file *f

/* Copy from real mem */
size = count - mem_offs - hdr_count;
- rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
- size);
+ rc = copy_to_user_real(buf + hdr_count + mem_offs,
+ (void *) mem_start + mem_offs, size);
if (rc)
goto fail;


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