Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 219 insertions, 0 deletions

diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c
new file mode 100644
index 000000000000..ffa996c8a908
--- /dev/null
+++ b/drivers/s390/s390mach.c
@@ -0,0 +1,219 @@
+/*
+ *  drivers/s390/s390mach.c
+ *   S/390 machine check handler
+ *
+ *  S390 version
+ *    Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Ingo Adlung (adlung@de.ibm.com)
+ *               Martin Schwidefsky (schwidefsky@de.ibm.com)
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/workqueue.h>
+
+#include <asm/lowcore.h>
+
+#include "s390mach.h"
+
+#define DBG printk
+// #define DBG(args,...) do {} while (0);
+
+static struct semaphore m_sem;
+
+extern int css_process_crw(int);
+extern int chsc_process_crw(void);
+extern int chp_process_crw(int, int);
+extern void css_reiterate_subchannels(void);
+
+extern struct workqueue_struct *slow_path_wq;
+extern struct work_struct slow_path_work;
+
+static void
+s390_handle_damage(char *msg)
+{
+        printk(KERN_EMERG "%s\n", msg);
+#ifdef CONFIG_SMP
+        smp_send_stop();
+#endif
+        disabled_wait((unsigned long) __builtin_return_address(0));
+}
+
+/*
+ * Retrieve CRWs and call function to handle event.
+ *
+ * Note : we currently process CRWs for io and chsc subchannels only
+ */
+static int
+s390_collect_crw_info(void *param)
+{
+        struct crw crw;
+        int ccode, ret, slow;
+        struct semaphore *sem;
+
+        sem = (struct semaphore *)param;
+        /* Set a nice name. */
+        daemonize("kmcheck");
+repeat:
+        down_interruptible(sem);
+        slow = 0;
+        while (1) {
+                ccode = stcrw(&crw);
+                if (ccode != 0)
+                        break;
+                DBG(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, "
+                    "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
+                    crw.slct, crw.oflw, crw.chn, crw.rsc, crw.anc,
+                    crw.erc, crw.rsid);
+                /* Check for overflows. */
+                if (crw.oflw) {
+                        pr_debug("%s: crw overflow detected!\n", __FUNCTION__);
+                        css_reiterate_subchannels();
+                        slow = 1;
+                        continue;
+                }
+                switch (crw.rsc) {
+                case CRW_RSC_SCH:
+                        pr_debug("source is subchannel %04X\n", crw.rsid);
+                        ret = css_process_crw (crw.rsid);
+                        if (ret == -EAGAIN)
+                                slow = 1;
+                        break;
+                case CRW_RSC_MONITOR:
+                        pr_debug("source is monitoring facility\n");
+                        break;
+                case CRW_RSC_CPATH:
+                        pr_debug("source is channel path %02X\n", crw.rsid);
+                        switch (crw.erc) {
+                        case CRW_ERC_IPARM: /* Path has come. */
+                                ret = chp_process_crw(crw.rsid, 1);
+                                break;
+                        case CRW_ERC_PERRI: /* Path has gone. */
+                        case CRW_ERC_PERRN:
+                                ret = chp_process_crw(crw.rsid, 0);
+                                break;
+                        default:
+                                pr_debug("Don't know how to handle erc=%x\n",
+                                         crw.erc);
+                                ret = 0;
+                        }
+                        if (ret == -EAGAIN)
+                                slow = 1;
+                        break;
+                case CRW_RSC_CONFIG:
+                        pr_debug("source is configuration-alert facility\n");
+                        break;
+                case CRW_RSC_CSS:
+                        pr_debug("source is channel subsystem\n");
+                        ret = chsc_process_crw();
+                        if (ret == -EAGAIN)
+                                slow = 1;
+                        break;
+                default:
+                        pr_debug("unknown source\n");
+                        break;
+                }
+        }
+        if (slow)
+                queue_work(slow_path_wq, &slow_path_work);
+        goto repeat;
+        return 0;
+}
+
+/*
+ * machine check handler.
+ */
+void
+s390_do_machine_check(void)
+{
+        struct mci *mci;
+
+        mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
+
+        if (mci->sd)            /* system damage */
+                s390_handle_damage("received system damage machine check\n");
+
+        if (mci->pd)            /* instruction processing damage */
+                s390_handle_damage("received instruction processing "
+                                   "damage machine check\n");
+
+        if (mci->se)            /* storage error uncorrected */
+                s390_handle_damage("received storage error uncorrected "
+                                   "machine check\n");
+
+        if (mci->sc)            /* storage error corrected */
+                printk(KERN_WARNING
+                       "received storage error corrected machine check\n");
+
+        if (mci->ke)            /* storage key-error uncorrected */
+                s390_handle_damage("received storage key-error uncorrected "
+                                   "machine check\n");
+
+        if (mci->ds && mci->fa) /* storage degradation */
+                s390_handle_damage("received storage degradation machine "
+                                   "check\n");
+
+        if (mci->cp)            /* channel report word pending */
+                up(&m_sem);
+
+#ifdef CONFIG_MACHCHK_WARNING
+/*
+ * The warning may remain for a prolonged period on the bare iron.
+ * (actually till the machine is powered off, or until the problem is gone)
+ * So we just stop listening for the WARNING MCH and prevent continuously
+ * being interrupted.  One caveat is however, that we must do this per
+ * processor and cannot use the smp version of ctl_clear_bit().
+ * On VM we only get one interrupt per virtally presented machinecheck.
+ * Though one suffices, we may get one interrupt per (virtual) processor.
+ */
+        if (mci->w) {   /* WARNING pending ? */
+                static int mchchk_wng_posted = 0;
+                /*
+                 * Use single machine clear, as we cannot handle smp right now
+                 */
+                __ctl_clear_bit(14, 24);        /* Disable WARNING MCH */
+                if (xchg(&mchchk_wng_posted, 1) == 0)
+                        kill_proc(1, SIGPWR, 1);
+        }
+#endif
+}
+
+/*
+ * s390_init_machine_check
+ *
+ * initialize machine check handling
+ */
+static int
+machine_check_init(void)
+{
+        init_MUTEX_LOCKED(&m_sem);
+        ctl_clear_bit(14, 25);  /* disable damage MCH */
+        ctl_set_bit(14, 26);    /* enable degradation MCH */
+        ctl_set_bit(14, 27);    /* enable system recovery MCH */
+#ifdef CONFIG_MACHCHK_WARNING
+        ctl_set_bit(14, 24);    /* enable warning MCH */
+#endif
+        return 0;
+}
+
+/*
+ * Initialize the machine check handler really early to be able to
+ * catch all machine checks that happen during boot
+ */
+arch_initcall(machine_check_init);
+
+/*
+ * Machine checks for the channel subsystem must be enabled
+ * after the channel subsystem is initialized
+ */
+static int __init
+machine_check_crw_init (void)
+{
+        kernel_thread(s390_collect_crw_info, &m_sem, CLONE_FS|CLONE_FILES);
+        ctl_set_bit(14, 28);    /* enable channel report MCH */
+        return 0;
+}
+
+device_initcall (machine_check_crw_init);