[S390] ipl/dump on panic.

It is now possible to specify a ccw/fcp dump device which is used to
automatically create a system dump in case of a kernel panic. The dump
device can be configured under /sys/firmware/dump.
In addition it is now possible to specify a ccw/fcp device which is used
for the next reboot of Linux. The reipl device can be configured under
/sys/firmware/reipl.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 942 insertions, 0 deletions

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
new file mode 100644
index 000000000000..105ee15a2b31
--- /dev/null
+++ b/arch/s390/kernel/ipl.c
@@ -0,0 +1,942 @@
+/*
+ *  arch/s390/kernel/ipl.c
+ *    ipl/reipl/dump support for Linux on s390.
+ *
+ *    Copyright (C) IBM Corp. 2005,2006
+ *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ *               Heiko Carstens <heiko.carstens@de.ibm.com>
+ *               Volker Sameske <sameske@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <asm/smp.h>
+#include <asm/setup.h>
+#include <asm/cpcmd.h>
+#include <asm/cio.h>
+
+#define IPL_PARM_BLOCK_VERSION 0
+
+enum ipl_type {
+        IPL_TYPE_NONE    = 1,
+        IPL_TYPE_UNKNOWN = 2,
+        IPL_TYPE_CCW     = 4,
+        IPL_TYPE_FCP     = 8,
+};
+
+#define IPL_NONE_STR     "none"
+#define IPL_UNKNOWN_STR  "unknown"
+#define IPL_CCW_STR      "ccw"
+#define IPL_FCP_STR      "fcp"
+
+static char *ipl_type_str(enum ipl_type type)
+{
+        switch (type) {
+        case IPL_TYPE_NONE:
+                return IPL_NONE_STR;
+        case IPL_TYPE_CCW:
+                return IPL_CCW_STR;
+        case IPL_TYPE_FCP:
+                return IPL_FCP_STR;
+        case IPL_TYPE_UNKNOWN:
+        default:
+                return IPL_UNKNOWN_STR;
+        }
+}
+
+enum ipl_method {
+        IPL_METHOD_NONE,
+        IPL_METHOD_CCW_CIO,
+        IPL_METHOD_CCW_DIAG,
+        IPL_METHOD_CCW_VM,
+        IPL_METHOD_FCP_RO_DIAG,
+        IPL_METHOD_FCP_RW_DIAG,
+        IPL_METHOD_FCP_RO_VM,
+};
+
+enum shutdown_action {
+        SHUTDOWN_REIPL,
+        SHUTDOWN_DUMP,
+        SHUTDOWN_STOP,
+};
+
+#define SHUTDOWN_REIPL_STR "reipl"
+#define SHUTDOWN_DUMP_STR  "dump"
+#define SHUTDOWN_STOP_STR  "stop"
+
+static char *shutdown_action_str(enum shutdown_action action)
+{
+        switch (action) {
+        case SHUTDOWN_REIPL:
+                return SHUTDOWN_REIPL_STR;
+        case SHUTDOWN_DUMP:
+                return SHUTDOWN_DUMP_STR;
+        case SHUTDOWN_STOP:
+                return SHUTDOWN_STOP_STR;
+        default:
+                BUG();
+        }
+}
+
+enum diag308_subcode  {
+        DIAG308_IPL   = 3,
+        DIAG308_DUMP  = 4,
+        DIAG308_SET   = 5,
+        DIAG308_STORE = 6,
+};
+
+enum diag308_ipl_type {
+        DIAG308_IPL_TYPE_FCP = 0,
+        DIAG308_IPL_TYPE_CCW = 2,
+};
+
+enum diag308_opt {
+        DIAG308_IPL_OPT_IPL  = 0x10,
+        DIAG308_IPL_OPT_DUMP = 0x20,
+};
+
+enum diag308_rc {
+        DIAG308_RC_OK = 1,
+};
+
+static int diag308_set_works = 0;
+
+static int reipl_capabilities = IPL_TYPE_UNKNOWN;
+static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
+static enum ipl_method reipl_method = IPL_METHOD_NONE;
+static struct ipl_parameter_block *reipl_block_fcp;
+static struct ipl_parameter_block *reipl_block_ccw;
+
+static int dump_capabilities = IPL_TYPE_NONE;
+static enum ipl_type dump_type = IPL_TYPE_NONE;
+static enum ipl_method dump_method = IPL_METHOD_NONE;
+static struct ipl_parameter_block *dump_block_fcp;
+static struct ipl_parameter_block *dump_block_ccw;
+
+static enum shutdown_action on_panic_action = SHUTDOWN_STOP;
+
+static int diag308(unsigned long subcode, void *addr)
+{
+        register unsigned long _addr asm("0") = (unsigned long)addr;
+        register unsigned long _rc asm("1") = 0;
+
+        asm volatile (
+                "   diag %0,%2,0x308\n"
+                "0: \n"
+                ".section __ex_table,\"a\"\n"
+#ifdef CONFIG_64BIT
+                "   .align 8\n"
+                "   .quad 0b, 0b\n"
+#else
+                "   .align 4\n"
+                "   .long 0b, 0b\n"
+#endif
+                ".previous\n"
+                : "+d" (_addr), "+d" (_rc)
+                : "d" (subcode) : "cc", "memory" );
+
+        return _rc;
+}
+
+/* SYSFS */
+
+#define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
+static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
+                char *page)                                             \
+{                                                                       \
+        return sprintf(page, _format, _value);                          \
+}                                                                       \
+static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
+        __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
+
+#define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
+static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
+                char *page)                                             \
+{                                                                       \
+        return sprintf(page, _fmt_out,                                  \
+                        (unsigned long long) _value);                   \
+}                                                                       \
+static ssize_t sys_##_prefix##_##_name##_store(struct subsystem *subsys,\
+                const char *buf, size_t len)                            \
+{                                                                       \
+        unsigned long long value;                                       \
+        if (sscanf(buf, _fmt_in, &value) != 1)                          \
+                return -EINVAL;                                         \
+        _value = value;                                                 \
+        return len;                                                     \
+}                                                                       \
+static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
+        __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
+                        sys_##_prefix##_##_name##_show,                 \
+                        sys_##_prefix##_##_name##_store);
+
+static void make_attrs_ro(struct attribute **attrs)
+{
+        while (*attrs) {
+                (*attrs)->mode = S_IRUGO;
+                attrs++;
+        }
+}
+
+/*
+ * ipl section
+ */
+
+static enum ipl_type ipl_get_type(void)
+{
+        struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
+
+        if (!IPL_DEVNO_VALID)
+                return IPL_TYPE_UNKNOWN;
+        if (!IPL_PARMBLOCK_VALID)
+                return IPL_TYPE_CCW;
+        if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
+                return IPL_TYPE_UNKNOWN;
+        if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
+                return IPL_TYPE_UNKNOWN;
+        return IPL_TYPE_FCP;
+}
+
+static ssize_t ipl_type_show(struct subsystem *subsys, char *page)
+{
+        return sprintf(page, "%s\n", ipl_type_str(ipl_get_type()));
+}
+
+static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
+
+static ssize_t sys_ipl_device_show(struct subsystem *subsys, char *page)
+{
+        struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
+
+        switch (ipl_get_type()) {
+        case IPL_TYPE_CCW:
+                return sprintf(page, "0.0.%04x\n", ipl_devno);
+        case IPL_TYPE_FCP:
+                return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
+        default:
+                return 0;
+        }
+}
+
+static struct subsys_attribute sys_ipl_device_attr =
+        __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
+
+static ssize_t ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off,
+                                  size_t count)
+{
+        unsigned int size = IPL_PARMBLOCK_SIZE;
+
+        if (off > size)
+                return 0;
+        if (off + count > size)
+                count = size - off;
+        memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
+        return count;
+}
+
+static struct bin_attribute ipl_parameter_attr = {
+        .attr = {
+                .name = "binary_parameter",
+                .mode = S_IRUGO,
+                .owner = THIS_MODULE,
+        },
+        .size = PAGE_SIZE,
+        .read = &ipl_parameter_read,
+};
+
+static ssize_t ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off,
+        size_t count)
+{
+        unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
+        void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
+
+        if (off > size)
+                return 0;
+        if (off + count > size)
+                count = size - off;
+        memcpy(buf, scp_data + off, count);
+        return count;
+}
+
+static struct bin_attribute ipl_scp_data_attr = {
+        .attr = {
+                .name = "scp_data",
+                .mode = S_IRUGO,
+                .owner = THIS_MODULE,
+        },
+        .size = PAGE_SIZE,
+        .read = &ipl_scp_data_read,
+};
+
+/* FCP ipl device attributes */
+
+DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
+                   IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
+DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
+                   IPL_PARMBLOCK_START->ipl_info.fcp.lun);
+DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
+                   IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
+DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
+                   IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
+
+static struct attribute *ipl_fcp_attrs[] = {
+        &sys_ipl_type_attr.attr,
+        &sys_ipl_device_attr.attr,
+        &sys_ipl_fcp_wwpn_attr.attr,
+        &sys_ipl_fcp_lun_attr.attr,
+        &sys_ipl_fcp_bootprog_attr.attr,
+        &sys_ipl_fcp_br_lba_attr.attr,
+        NULL,
+};
+
+static struct attribute_group ipl_fcp_attr_group = {
+        .attrs = ipl_fcp_attrs,
+};
+
+/* CCW ipl device attributes */
+
+static struct attribute *ipl_ccw_attrs[] = {
+        &sys_ipl_type_attr.attr,
+        &sys_ipl_device_attr.attr,
+        NULL,
+};
+
+static struct attribute_group ipl_ccw_attr_group = {
+        .attrs = ipl_ccw_attrs,
+};
+
+/* UNKNOWN ipl device attributes */
+
+static struct attribute *ipl_unknown_attrs[] = {
+        &sys_ipl_type_attr.attr,
+        NULL,
+};
+
+static struct attribute_group ipl_unknown_attr_group = {
+        .attrs = ipl_unknown_attrs,
+};
+
+static decl_subsys(ipl, NULL, NULL);
+
+/*
+ * reipl section
+ */
+
+/* FCP reipl device attributes */
+
+DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
+                   reipl_block_fcp->ipl_info.fcp.wwpn);
+DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
+                   reipl_block_fcp->ipl_info.fcp.lun);
+DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
+                   reipl_block_fcp->ipl_info.fcp.bootprog);
+DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
+                   reipl_block_fcp->ipl_info.fcp.br_lba);
+DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
+                   reipl_block_fcp->ipl_info.fcp.devno);
+
+static struct attribute *reipl_fcp_attrs[] = {
+        &sys_reipl_fcp_device_attr.attr,
+        &sys_reipl_fcp_wwpn_attr.attr,
+        &sys_reipl_fcp_lun_attr.attr,
+        &sys_reipl_fcp_bootprog_attr.attr,
+        &sys_reipl_fcp_br_lba_attr.attr,
+        NULL,
+};
+
+static struct attribute_group reipl_fcp_attr_group = {
+        .name  = IPL_FCP_STR,
+        .attrs = reipl_fcp_attrs,
+};
+
+/* CCW reipl device attributes */
+
+DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
+        reipl_block_ccw->ipl_info.ccw.devno);
+
+static struct attribute *reipl_ccw_attrs[] = {
+        &sys_reipl_ccw_device_attr.attr,
+        NULL,
+};
+
+static struct attribute_group reipl_ccw_attr_group = {
+        .name  = IPL_CCW_STR,
+        .attrs = reipl_ccw_attrs,
+};
+
+/* reipl type */
+
+static int reipl_set_type(enum ipl_type type)
+{
+        if (!(reipl_capabilities & type))
+                return -EINVAL;
+
+        switch(type) {
+        case IPL_TYPE_CCW:
+                if (MACHINE_IS_VM)
+                        reipl_method = IPL_METHOD_CCW_VM;
+                else
+                        reipl_method = IPL_METHOD_CCW_CIO;
+                break;
+        case IPL_TYPE_FCP:
+                if (diag308_set_works)
+                        reipl_method = IPL_METHOD_FCP_RW_DIAG;
+                else if (MACHINE_IS_VM)
+                        reipl_method = IPL_METHOD_FCP_RO_VM;
+                else
+                        reipl_method = IPL_METHOD_FCP_RO_DIAG;
+                break;
+        default:
+                reipl_method = IPL_METHOD_NONE;
+        }
+        reipl_type = type;
+        return 0;
+}
+
+static ssize_t reipl_type_show(struct subsystem *subsys, char *page)
+{
+        return sprintf(page, "%s\n", ipl_type_str(reipl_type));
+}
+
+static ssize_t reipl_type_store(struct subsystem *subsys, const char *buf,
+                                size_t len)
+{
+        int rc = -EINVAL;
+
+        if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
+                rc = reipl_set_type(IPL_TYPE_CCW);
+        else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
+                rc = reipl_set_type(IPL_TYPE_FCP);
+        return (rc != 0) ? rc : len;
+}
+
+static struct subsys_attribute reipl_type_attr =
+                __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
+
+static decl_subsys(reipl, NULL, NULL);
+
+/*
+ * dump section
+ */
+
+/* FCP dump device attributes */
+
+DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
+                   dump_block_fcp->ipl_info.fcp.wwpn);
+DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
+                   dump_block_fcp->ipl_info.fcp.lun);
+DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
+                   dump_block_fcp->ipl_info.fcp.bootprog);
+DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
+                   dump_block_fcp->ipl_info.fcp.br_lba);
+DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
+                   dump_block_fcp->ipl_info.fcp.devno);
+
+static struct attribute *dump_fcp_attrs[] = {
+        &sys_dump_fcp_device_attr.attr,
+        &sys_dump_fcp_wwpn_attr.attr,
+        &sys_dump_fcp_lun_attr.attr,
+        &sys_dump_fcp_bootprog_attr.attr,
+        &sys_dump_fcp_br_lba_attr.attr,
+        NULL,
+};
+
+static struct attribute_group dump_fcp_attr_group = {
+        .name  = IPL_FCP_STR,
+        .attrs = dump_fcp_attrs,
+};
+
+/* CCW dump device attributes */
+
+DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
+                   dump_block_ccw->ipl_info.ccw.devno);
+
+static struct attribute *dump_ccw_attrs[] = {
+        &sys_dump_ccw_device_attr.attr,
+        NULL,
+};
+
+static struct attribute_group dump_ccw_attr_group = {
+        .name  = IPL_CCW_STR,
+        .attrs = dump_ccw_attrs,
+};
+
+/* dump type */
+
+static int dump_set_type(enum ipl_type type)
+{
+        if (!(dump_capabilities & type))
+                return -EINVAL;
+        switch(type) {
+        case IPL_TYPE_CCW:
+                if (MACHINE_IS_VM)
+                        dump_method = IPL_METHOD_CCW_VM;
+                else
+                        dump_method = IPL_METHOD_CCW_CIO;
+                break;
+        case IPL_TYPE_FCP:
+                dump_method = IPL_METHOD_FCP_RW_DIAG;
+                break;
+        default:
+                dump_method = IPL_METHOD_NONE;
+        }
+        dump_type = type;
+        return 0;
+}
+
+static ssize_t dump_type_show(struct subsystem *subsys, char *page)
+{
+        return sprintf(page, "%s\n", ipl_type_str(dump_type));
+}
+
+static ssize_t dump_type_store(struct subsystem *subsys, const char *buf,
+                               size_t len)
+{
+        int rc = -EINVAL;
+
+        if (strncmp(buf, IPL_NONE_STR, strlen(IPL_NONE_STR)) == 0)
+                rc = dump_set_type(IPL_TYPE_NONE);
+        else if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
+                rc = dump_set_type(IPL_TYPE_CCW);
+        else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
+                rc = dump_set_type(IPL_TYPE_FCP);
+        return (rc != 0) ? rc : len;
+}
+
+static struct subsys_attribute dump_type_attr =
+                __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
+
+static decl_subsys(dump, NULL, NULL);
+
+#ifdef CONFIG_SMP
+static void dump_smp_stop_all(void)
+{
+        int cpu;
+        preempt_disable();
+        for_each_online_cpu(cpu) {
+                if (cpu == smp_processor_id())
+                        continue;
+                while (signal_processor(cpu, sigp_stop) == sigp_busy)
+                        udelay(10);
+        }
+        preempt_enable();
+}
+#else
+#define dump_smp_stop_all() do { } while (0)
+#endif
+
+/*
+ * Shutdown actions section
+ */
+
+static decl_subsys(shutdown_actions, NULL, NULL);
+
+/* on panic */
+
+static ssize_t on_panic_show(struct subsystem *subsys, char *page)
+{
+        return sprintf(page, "%s\n", shutdown_action_str(on_panic_action));
+}
+
+static ssize_t on_panic_store(struct subsystem *subsys, const char *buf,
+                              size_t len)
+{
+        if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
+                on_panic_action = SHUTDOWN_REIPL;
+        else if (strncmp(buf, SHUTDOWN_DUMP_STR,
+                         strlen(SHUTDOWN_DUMP_STR)) == 0)
+                on_panic_action = SHUTDOWN_DUMP;
+        else if (strncmp(buf, SHUTDOWN_STOP_STR,
+                         strlen(SHUTDOWN_STOP_STR)) == 0)
+                on_panic_action = SHUTDOWN_STOP;
+        else
+                return -EINVAL;
+
+        return len;
+}
+
+static struct subsys_attribute on_panic_attr =
+                __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
+
+static void print_fcp_block(struct ipl_parameter_block *fcp_block)
+{
+        printk(KERN_EMERG "wwpn:      %016llx\n",
+                (unsigned long long)fcp_block->ipl_info.fcp.wwpn);
+        printk(KERN_EMERG "lun:       %016llx\n",
+                (unsigned long long)fcp_block->ipl_info.fcp.lun);
+        printk(KERN_EMERG "bootprog:  %lld\n",
+                (unsigned long long)fcp_block->ipl_info.fcp.bootprog);
+        printk(KERN_EMERG "br_lba:    %lld\n",
+                (unsigned long long)fcp_block->ipl_info.fcp.br_lba);
+        printk(KERN_EMERG "device:    %llx\n",
+                (unsigned long long)fcp_block->ipl_info.fcp.devno);
+        printk(KERN_EMERG "opt:       %x\n", fcp_block->ipl_info.fcp.opt);
+}
+
+void do_reipl(void)
+{
+        struct ccw_dev_id devid;
+        static char buf[100];
+
+        switch (reipl_type) {
+        case IPL_TYPE_CCW:
+                printk(KERN_EMERG "reboot on ccw device: 0.0.%04x\n",
+                        reipl_block_ccw->ipl_info.ccw.devno);
+                break;
+        case IPL_TYPE_FCP:
+                printk(KERN_EMERG "reboot on fcp device:\n");
+                print_fcp_block(reipl_block_fcp);
+                break;
+        default:
+                break;
+        }
+
+        switch (reipl_method) {
+        case IPL_METHOD_CCW_CIO:
+                devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
+                devid.ssid  = 0;
+                reipl_ccw_dev(&devid);
+                break;
+        case IPL_METHOD_CCW_VM:
+                sprintf(buf, "IPL %X", reipl_block_ccw->ipl_info.ccw.devno);
+                cpcmd(buf, NULL, 0, NULL);
+                break;
+        case IPL_METHOD_CCW_DIAG:
+                diag308(DIAG308_SET, reipl_block_ccw);
+                diag308(DIAG308_IPL, NULL);
+                break;
+        case IPL_METHOD_FCP_RW_DIAG:
+                diag308(DIAG308_SET, reipl_block_fcp);
+                diag308(DIAG308_IPL, NULL);
+                break;
+        case IPL_METHOD_FCP_RO_DIAG:
+                diag308(DIAG308_IPL, NULL);
+                break;
+        case IPL_METHOD_FCP_RO_VM:
+                cpcmd("IPL", NULL, 0, NULL);
+                break;
+        case IPL_METHOD_NONE:
+        default:
+                if (MACHINE_IS_VM)
+                        cpcmd("IPL", NULL, 0, NULL);
+                diag308(DIAG308_IPL, NULL);
+                break;
+        }
+        panic("reipl failed!\n");
+}
+
+static void do_dump(void)
+{
+        struct ccw_dev_id devid;
+        static char buf[100];
+
+        switch (dump_type) {
+        case IPL_TYPE_CCW:
+                printk(KERN_EMERG "Automatic dump on ccw device: 0.0.%04x\n",
+                       dump_block_ccw->ipl_info.ccw.devno);
+                break;
+        case IPL_TYPE_FCP:
+                printk(KERN_EMERG "Automatic dump on fcp device:\n");
+                print_fcp_block(dump_block_fcp);
+                break;
+        default:
+                return;
+        }
+
+        switch (dump_method) {
+        case IPL_METHOD_CCW_CIO:
+                dump_smp_stop_all();
+                devid.devno = dump_block_ccw->ipl_info.ccw.devno;
+                devid.ssid  = 0;
+                reipl_ccw_dev(&devid);
+                break;
+        case IPL_METHOD_CCW_VM:
+                dump_smp_stop_all();
+                sprintf(buf, "STORE STATUS");
+                cpcmd(buf, NULL, 0, NULL);
+                sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
+                cpcmd(buf, NULL, 0, NULL);
+                break;
+        case IPL_METHOD_CCW_DIAG:
+                diag308(DIAG308_SET, dump_block_ccw);
+                diag308(DIAG308_DUMP, NULL);
+                break;
+        case IPL_METHOD_FCP_RW_DIAG:
+                diag308(DIAG308_SET, dump_block_fcp);
+                diag308(DIAG308_DUMP, NULL);
+                break;
+        case IPL_METHOD_NONE:
+        default:
+                return;
+        }
+        printk(KERN_EMERG "Dump failed!\n");
+}
+
+/* init functions */
+
+static int __init ipl_register_fcp_files(void)
+{
+        int rc;
+
+        rc = sysfs_create_group(&ipl_subsys.kset.kobj,
+                                &ipl_fcp_attr_group);
+        if (rc)
+                goto out;
+        rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
+                                   &ipl_parameter_attr);
+        if (rc)
+                goto out_ipl_parm;
+        rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
+                                   &ipl_scp_data_attr);
+        if (!rc)
+                goto out;
+
+        sysfs_remove_bin_file(&ipl_subsys.kset.kobj, &ipl_parameter_attr);
+
+out_ipl_parm:
+        sysfs_remove_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
+out:
+        return rc;
+}
+
+static int __init ipl_init(void)
+{
+        int rc;
+
+        rc = firmware_register(&ipl_subsys);
+        if (rc)
+                return rc;
+        switch (ipl_get_type()) {
+        case IPL_TYPE_CCW:
+                rc = sysfs_create_group(&ipl_subsys.kset.kobj,
+                                        &ipl_ccw_attr_group);
+                break;
+        case IPL_TYPE_FCP:
+                rc = ipl_register_fcp_files();
+                break;
+        default:
+                rc = sysfs_create_group(&ipl_subsys.kset.kobj,
+                                        &ipl_unknown_attr_group);
+                break;
+        }
+        if (rc)
+                firmware_unregister(&ipl_subsys);
+        return rc;
+}
+
+static void __init reipl_probe(void)
+{
+        void *buffer;
+
+        buffer = (void *) get_zeroed_page(GFP_KERNEL);
+        if (!buffer)
+                return;
+        if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
+                diag308_set_works = 1;
+        free_page((unsigned long)buffer);
+}
+
+static int __init reipl_ccw_init(void)
+{
+        int rc;
+
+        reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
+        if (!reipl_block_ccw)
+                return -ENOMEM;
+        rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_ccw_attr_group);
+        if (rc) {
+                free_page((unsigned long)reipl_block_ccw);
+                return rc;
+        }
+        reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
+        reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
+        reipl_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
+        reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
+        if (ipl_get_type() == IPL_TYPE_CCW)
+                reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
+        reipl_capabilities |= IPL_TYPE_CCW;
+        return 0;
+}
+
+static int __init reipl_fcp_init(void)
+{
+        int rc;
+
+        if ((!diag308_set_works) && (ipl_get_type() != IPL_TYPE_FCP))
+                return 0;
+        if ((!diag308_set_works) && (ipl_get_type() == IPL_TYPE_FCP))
+                make_attrs_ro(reipl_fcp_attrs);
+
+        reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
+        if (!reipl_block_fcp)
+                return -ENOMEM;
+        rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_fcp_attr_group);
+        if (rc) {
+                free_page((unsigned long)reipl_block_fcp);
+                return rc;
+        }
+        if (ipl_get_type() == IPL_TYPE_FCP) {
+                memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
+        } else {
+                reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
+                reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
+                reipl_block_fcp->hdr.blk0_len =
+                        sizeof(reipl_block_fcp->ipl_info.fcp);
+                reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
+                reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
+        }
+        reipl_capabilities |= IPL_TYPE_FCP;
+        return 0;
+}
+
+static int __init reipl_init(void)
+{
+        int rc;
+
+        rc = firmware_register(&reipl_subsys);
+        if (rc)
+                return rc;
+        rc = subsys_create_file(&reipl_subsys, &reipl_type_attr);
+        if (rc) {
+                firmware_unregister(&reipl_subsys);
+                return rc;
+        }
+        rc = reipl_ccw_init();
+        if (rc)
+                return rc;
+        rc = reipl_fcp_init();
+        if (rc)
+                return rc;
+        rc = reipl_set_type(ipl_get_type());
+        if (rc)
+                return rc;
+        return 0;
+}
+
+static int __init dump_ccw_init(void)
+{
+        int rc;
+
+        dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
+        if (!dump_block_ccw)
+                return -ENOMEM;
+        rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_ccw_attr_group);
+        if (rc) {
+                free_page((unsigned long)dump_block_ccw);
+                return rc;
+        }
+        dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
+        dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
+        dump_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
+        dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
+        dump_capabilities |= IPL_TYPE_CCW;
+        return 0;
+}
+
+extern char s390_readinfo_sccb[];
+
+static int __init dump_fcp_init(void)
+{
+        int rc;
+
+        if(!(s390_readinfo_sccb[91] & 0x2))
+                return 0; /* LDIPL DUMP is not installed */
+        if (!diag308_set_works)
+                return 0;
+        dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
+        if (!dump_block_fcp)
+                return -ENOMEM;
+        rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_fcp_attr_group);
+        if (rc) {
+                free_page((unsigned long)dump_block_fcp);
+                return rc;
+        }
+        dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
+        dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
+        dump_block_fcp->hdr.blk0_len = sizeof(dump_block_fcp->ipl_info.fcp);
+        dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
+        dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
+        dump_capabilities |= IPL_TYPE_FCP;
+        return 0;
+}
+
+#define SHUTDOWN_ON_PANIC_PRIO 0
+
+static int shutdown_on_panic_notify(struct notifier_block *self,
+                                    unsigned long event, void *data)
+{
+        if (on_panic_action == SHUTDOWN_DUMP)
+                do_dump();
+        else if (on_panic_action == SHUTDOWN_REIPL)
+                do_reipl();
+        return NOTIFY_OK;
+}
+
+static struct notifier_block shutdown_on_panic_nb = {
+        .notifier_call = shutdown_on_panic_notify,
+        .priority = SHUTDOWN_ON_PANIC_PRIO
+};
+
+static int __init dump_init(void)
+{
+        int rc;
+
+        rc = firmware_register(&dump_subsys);
+        if (rc)
+                return rc;
+        rc = subsys_create_file(&dump_subsys, &dump_type_attr);
+        if (rc) {
+                firmware_unregister(&dump_subsys);
+                return rc;
+        }
+        rc = dump_ccw_init();
+        if (rc)
+                return rc;
+        rc = dump_fcp_init();
+        if (rc)
+                return rc;
+        dump_set_type(IPL_TYPE_NONE);
+        return 0;
+}
+
+static int __init shutdown_actions_init(void)
+{
+        int rc;
+
+        rc = firmware_register(&shutdown_actions_subsys);
+        if (rc)
+                return rc;
+        rc = subsys_create_file(&shutdown_actions_subsys, &on_panic_attr);
+        if (rc) {
+                firmware_unregister(&shutdown_actions_subsys);
+                return rc;
+        }
+        atomic_notifier_chain_register(&panic_notifier_list,
+                                       &shutdown_on_panic_nb);
+        return 0;
+}
+
+static int __init s390_ipl_init(void)
+{
+        int rc;
+
+        reipl_probe();
+        rc = ipl_init();
+        if (rc)
+                return rc;
+        rc = reipl_init();
+        if (rc)
+                return rc;
+        rc = dump_init();
+        if (rc)
+                return rc;
+        rc = shutdown_actions_init();
+        if (rc)
+                return rc;
+        return 0;
+}
+
+__initcall(s390_ipl_init);