1 files changed, 156 insertions, 29 deletions

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 1f5e782b3d05..a36bea1188d9 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -13,12 +13,21 @@
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/reboot.h>
+#include <linux/ctype.h>
 #include <asm/smp.h>
 #include <asm/setup.h>
 #include <asm/cpcmd.h>
 #include <asm/cio.h>
+#include <asm/ebcdic.h>
+#include <asm/reset.h>
 
 #define IPL_PARM_BLOCK_VERSION 0
+#define LOADPARM_LEN 8
+
+extern char s390_readinfo_sccb[];
+#define SCCB_VALID (*((__u16*)&s390_readinfo_sccb[6]) == 0x0010)
+#define SCCB_LOADPARM (&s390_readinfo_sccb[24])
+#define SCCB_FLAG (s390_readinfo_sccb[91])
 
 enum ipl_type {
         IPL_TYPE_NONE    = 1,
@@ -289,9 +298,25 @@ static struct attribute_group ipl_fcp_attr_group = {
 
 /* CCW ipl device attributes */
 
+static ssize_t ipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
+{
+        char loadparm[LOADPARM_LEN + 1] = {};
+
+        if (!SCCB_VALID)
+                return sprintf(page, "#unknown#\n");
+        memcpy(loadparm, SCCB_LOADPARM, LOADPARM_LEN);
+        EBCASC(loadparm, LOADPARM_LEN);
+        strstrip(loadparm);
+        return sprintf(page, "%s\n", loadparm);
+}
+
+static struct subsys_attribute sys_ipl_ccw_loadparm_attr =
+        __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
+
 static struct attribute *ipl_ccw_attrs[] = {
         &sys_ipl_type_attr.attr,
         &sys_ipl_device_attr.attr,
+        &sys_ipl_ccw_loadparm_attr.attr,
         NULL,
 };
 
@@ -348,8 +373,57 @@ static struct attribute_group reipl_fcp_attr_group = {
 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
         reipl_block_ccw->ipl_info.ccw.devno);
 
+static void reipl_get_ascii_loadparm(char *loadparm)
+{
+        memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
+               LOADPARM_LEN);
+        EBCASC(loadparm, LOADPARM_LEN);
+        loadparm[LOADPARM_LEN] = 0;
+        strstrip(loadparm);
+}
+
+static ssize_t reipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
+{
+        char buf[LOADPARM_LEN + 1];
+
+        reipl_get_ascii_loadparm(buf);
+        return sprintf(page, "%s\n", buf);
+}
+
+static ssize_t reipl_ccw_loadparm_store(struct subsystem *subsys,
+                                        const char *buf, size_t len)
+{
+        int i, lp_len;
+
+        /* ignore trailing newline */
+        lp_len = len;
+        if ((len > 0) && (buf[len - 1] == '\n'))
+                lp_len--;
+        /* loadparm can have max 8 characters and must not start with a blank */
+        if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
+                return -EINVAL;
+        /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
+        for (i = 0; i < lp_len; i++) {
+                if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
+                    (buf[i] == '.'))
+                        continue;
+                return -EINVAL;
+        }
+        /* initialize loadparm with blanks */
+        memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
+        /* copy and convert to ebcdic */
+        memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
+        ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
+        return len;
+}
+
+static struct subsys_attribute sys_reipl_ccw_loadparm_attr =
+        __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
+               reipl_ccw_loadparm_store);
+
 static struct attribute *reipl_ccw_attrs[] = {
         &sys_reipl_ccw_device_attr.attr,
+        &sys_reipl_ccw_loadparm_attr.attr,
         NULL,
 };
 
@@ -502,23 +576,6 @@ static struct subsys_attribute dump_type_attr =
 
 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
  */
@@ -571,11 +628,14 @@ void do_reipl(void)
 {
         struct ccw_dev_id devid;
         static char buf[100];
+        char loadparm[LOADPARM_LEN + 1];
 
         switch (reipl_type) {
         case IPL_TYPE_CCW:
+                reipl_get_ascii_loadparm(loadparm);
                 printk(KERN_EMERG "reboot on ccw device: 0.0.%04x\n",
                         reipl_block_ccw->ipl_info.ccw.devno);
+                printk(KERN_EMERG "loadparm = '%s'\n", loadparm);
                 break;
         case IPL_TYPE_FCP:
                 printk(KERN_EMERG "reboot on fcp device:\n");
@@ -588,12 +648,19 @@ void do_reipl(void)
         switch (reipl_method) {
         case IPL_METHOD_CCW_CIO:
                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
+                if (ipl_get_type() == IPL_TYPE_CCW && devid.devno == ipl_devno)
+                        diag308(DIAG308_IPL, NULL);
                 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);
+                if (strlen(loadparm) == 0)
+                        sprintf(buf, "IPL %X",
+                                reipl_block_ccw->ipl_info.ccw.devno);
+                else
+                        sprintf(buf, "IPL %X LOADPARM '%s'",
+                                reipl_block_ccw->ipl_info.ccw.devno, loadparm);
+                __cpcmd(buf, NULL, 0, NULL);
                 break;
         case IPL_METHOD_CCW_DIAG:
                 diag308(DIAG308_SET, reipl_block_ccw);
@@ -607,16 +674,17 @@ void do_reipl(void)
                 diag308(DIAG308_IPL, NULL);
                 break;
         case IPL_METHOD_FCP_RO_VM:
-                cpcmd("IPL", NULL, 0, NULL);
+                __cpcmd("IPL", NULL, 0, NULL);
                 break;
         case IPL_METHOD_NONE:
         default:
                 if (MACHINE_IS_VM)
-                        cpcmd("IPL", NULL, 0, NULL);
+                        __cpcmd("IPL", NULL, 0, NULL);
                 diag308(DIAG308_IPL, NULL);
                 break;
         }
-        panic("reipl failed!\n");
+        printk(KERN_EMERG "reboot failed!\n");
+        signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 }
 
 static void do_dump(void)
@@ -639,17 +707,17 @@ static void do_dump(void)
 
         switch (dump_method) {
         case IPL_METHOD_CCW_CIO:
-                dump_smp_stop_all();
+                smp_send_stop();
                 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();
+                smp_send_stop();
                 sprintf(buf, "STORE STATUS");
-                cpcmd(buf, NULL, 0, NULL);
+                __cpcmd(buf, NULL, 0, NULL);
                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
-                cpcmd(buf, NULL, 0, NULL);
+                __cpcmd(buf, NULL, 0, NULL);
                 break;
         case IPL_METHOD_CCW_DIAG:
                 diag308(DIAG308_SET, dump_block_ccw);
@@ -746,6 +814,17 @@ static int __init reipl_ccw_init(void)
         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;
+        /* check if read scp info worked and set loadparm */
+        if (SCCB_VALID)
+                memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
+                       SCCB_LOADPARM, LOADPARM_LEN);
+        else
+                /* read scp info failed: set empty loadparm (EBCDIC blanks) */
+                memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
+                       LOADPARM_LEN);
+        /* FIXME: check for diag308_set_works when enabling diag ccw reipl */
+        if (!MACHINE_IS_VM)
+                sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
         if (ipl_get_type() == IPL_TYPE_CCW)
                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
         reipl_capabilities |= IPL_TYPE_CCW;
@@ -827,13 +906,11 @@ static int __init dump_ccw_init(void)
         return 0;
 }
 
-extern char s390_readinfo_sccb[];
-
 static int __init dump_fcp_init(void)
 {
         int rc;
 
-        if(!(s390_readinfo_sccb[91] & 0x2))
+        if(!(SCCB_FLAG & 0x2) || !SCCB_VALID)
                 return 0; /* LDIPL DUMP is not installed */
         if (!diag308_set_works)
                 return 0;
@@ -931,3 +1008,53 @@ static int __init s390_ipl_init(void)
 }
 
 __initcall(s390_ipl_init);
+
+static LIST_HEAD(rcall);
+static DEFINE_MUTEX(rcall_mutex);
+
+void register_reset_call(struct reset_call *reset)
+{
+        mutex_lock(&rcall_mutex);
+        list_add(&reset->list, &rcall);
+        mutex_unlock(&rcall_mutex);
+}
+EXPORT_SYMBOL_GPL(register_reset_call);
+
+void unregister_reset_call(struct reset_call *reset)
+{
+        mutex_lock(&rcall_mutex);
+        list_del(&reset->list);
+        mutex_unlock(&rcall_mutex);
+}
+EXPORT_SYMBOL_GPL(unregister_reset_call);
+
+static void do_reset_calls(void)
+{
+        struct reset_call *reset;
+
+        list_for_each_entry(reset, &rcall, list)
+                reset->fn();
+}
+
+extern void reset_mcck_handler(void);
+
+void s390_reset_system(void)
+{
+        struct _lowcore *lc;
+
+        /* Stack for interrupt/machine check handler */
+        lc = (struct _lowcore *)(unsigned long) store_prefix();
+        lc->panic_stack = S390_lowcore.panic_stack;
+
+        /* Disable prefixing */
+        set_prefix(0);
+
+        /* Disable lowcore protection */
+        __ctl_clear_bit(0,28);
+
+        /* Set new machine check handler */
+        S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_MCHECK;
+        S390_lowcore.mcck_new_psw.addr =
+                PSW_ADDR_AMODE | (unsigned long) &reset_mcck_handler;
+        do_reset_calls();
+}