--- /dev/null
+/*
+ * SN Platform system controller communication support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+/*
+ * System controller event handler
+ *
+ * These routines deal with environmental events arriving from the
+ * system controllers.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/byteorder/generic.h>
+#include <asm/sn/sn_sal.h>
+#include "snsc.h"
+
+static struct subch_data_s *event_sd;
+
+void scdrv_event(unsigned long);
+DECLARE_TASKLET(sn_sysctl_event, scdrv_event, 0);
+
+/*
+ * scdrv_event_interrupt
+ *
+ * Pull incoming environmental events off the physical link to the
+ * system controller and put them in a temporary holding area in SAL.
+ * Schedule scdrv_event() to move them along to their ultimate
+ * destination.
+ */
+static irqreturn_t
+scdrv_event_interrupt(int irq, void *subch_data, struct pt_regs *regs)
+{
+ struct subch_data_s *sd = subch_data;
+ unsigned long flags;
+ int status;
+
+ spin_lock_irqsave(&sd->sd_rlock, flags);
+ status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);
+
+ if ((status > 0) && (status & SAL_IROUTER_INTR_RECV)) {
+ tasklet_schedule(&sn_sysctl_event);
+ }
+ spin_unlock_irqrestore(&sd->sd_rlock, flags);
+ return IRQ_HANDLED;
+}
+
+
+/*
+ * scdrv_parse_event
+ *
+ * Break an event (as read from SAL) into useful pieces so we can decide
+ * what to do with it.
+ */
+static int
+scdrv_parse_event(char *event, int *src, int *code, int *esp_code, char *desc)
+{
+ char *desc_end;
+
+ /* record event source address */
+ *src = be32_to_cpup((__be32 *)event);
+ event += 4; /* move on to event code */
+
+ /* record the system controller's event code */
+ *code = be32_to_cpup((__be32 *)event);
+ event += 4; /* move on to event arguments */
+
+ /* how many arguments are in the packet? */
+ if (*event++ != 2) {
+ /* if not 2, give up */
+ return -1;
+ }
+
+ /* parse out the ESP code */
+ if (*event++ != IR_ARG_INT) {
+ /* not an integer argument, so give up */
+ return -1;
+ }
+ *esp_code = be32_to_cpup((__be32 *)event);
+ event += 4;
+
+ /* parse out the event description */
+ if (*event++ != IR_ARG_ASCII) {
+ /* not an ASCII string, so give up */
+ return -1;
+ }
+ event[CHUNKSIZE-1] = '\0'; /* ensure this string ends! */
+ event += 2; /* skip leading CR/LF */
+ desc_end = desc + sprintf(desc, "%s", event);
+
+ /* strip trailing CR/LF (if any) */
+ for (desc_end--;
+ (desc_end != desc) && ((*desc_end == 0xd) || (*desc_end == 0xa));
+ desc_end--) {
+ *desc_end = '\0';
+ }
+
+ return 0;
+}
+
+
+/*
+ * scdrv_event_severity
+ *
+ * Figure out how urgent a message we should write to the console/syslog
+ * via printk.
+ */
+static char *
+scdrv_event_severity(int code)
+{
+ int ev_class = (code & EV_CLASS_MASK);
+ int ev_severity = (code & EV_SEVERITY_MASK);
+ char *pk_severity = KERN_NOTICE;
+
+ switch (ev_class) {
+ case EV_CLASS_POWER:
+ switch (ev_severity) {
+ case EV_SEVERITY_POWER_LOW_WARNING:
+ case EV_SEVERITY_POWER_HIGH_WARNING:
+ pk_severity = KERN_WARNING;
+ break;
+ case EV_SEVERITY_POWER_HIGH_FAULT:
+ case EV_SEVERITY_POWER_LOW_FAULT:
+ pk_severity = KERN_ALERT;
+ break;
+ }
+ break;
+ case EV_CLASS_FAN:
+ switch (ev_severity) {
+ case EV_SEVERITY_FAN_WARNING:
+ pk_severity = KERN_WARNING;
+ break;
+ case EV_SEVERITY_FAN_FAULT:
+ pk_severity = KERN_CRIT;
+ break;
+ }
+ break;
+ case EV_CLASS_TEMP:
+ switch (ev_severity) {
+ case EV_SEVERITY_TEMP_ADVISORY:
+ pk_severity = KERN_WARNING;
+ break;
+ case EV_SEVERITY_TEMP_CRITICAL:
+ pk_severity = KERN_CRIT;
+ break;
+ case EV_SEVERITY_TEMP_FAULT:
+ pk_severity = KERN_ALERT;
+ break;
+ }
+ break;
+ case EV_CLASS_ENV:
+ pk_severity = KERN_ALERT;
+ break;
+ case EV_CLASS_TEST_FAULT:
+ pk_severity = KERN_ALERT;
+ break;
+ case EV_CLASS_TEST_WARNING:
+ pk_severity = KERN_WARNING;
+ break;
+ case EV_CLASS_PWRD_NOTIFY:
+ pk_severity = KERN_ALERT;
+ break;
+ }
+
+ return pk_severity;
+}
+
+
+/*
+ * scdrv_dispatch_event
+ *
+ * Do the right thing with an incoming event. That's often nothing
+ * more than printing it to the system log. For power-down notifications
+ * we start a graceful shutdown.
+ */
+static void
+scdrv_dispatch_event(char *event, int len)
+{
+ int code, esp_code, src;
+ char desc[CHUNKSIZE];
+ char *severity;
+
+ if (scdrv_parse_event(event, &src, &code, &esp_code, desc) < 0) {
+ /* ignore uninterpretible event */
+ return;
+ }
+
+ /* how urgent is the message? */
+ severity = scdrv_event_severity(code);
+
+ if ((code & EV_CLASS_MASK) == EV_CLASS_PWRD_NOTIFY) {
+ struct task_struct *p;
+
+ /* give a SIGPWR signal to init proc */
+
+ /* first find init's task */
+ read_lock(&tasklist_lock);
+ for_each_process(p) {
+ if (p->pid == 1)
+ break;
+ }
+ if (p) { /* we found init's task */
+ printk(KERN_EMERG "Power off indication received. Initiating power fail sequence...\n");
+ force_sig(SIGPWR, p);
+ } else { /* failed to find init's task - just give message(s) */
+ printk(KERN_WARNING "Failed to find init proc to handle power off!\n");
+ printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
+ }
+ read_unlock(&tasklist_lock);
+ } else {
+ /* print to system log */
+ printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
+ }
+}
+
+
+/*
+ * scdrv_event
+ *
+ * Called as a tasklet when an event arrives from the L1. Read the event
+ * from where it's temporarily stored in SAL and call scdrv_dispatch_event()
+ * to send it on its way. Keep trying to read events until SAL indicates
+ * that there are no more immediately available.
+ */
+void
+scdrv_event(unsigned long dummy)
+{
+ int status;
+ int len;
+ unsigned long flags;
+ struct subch_data_s *sd = event_sd;
+
+ /* anything to read? */
+ len = CHUNKSIZE;
+ spin_lock_irqsave(&sd->sd_rlock, flags);
+ status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
+ sd->sd_rb, &len);
+
+ while (!(status < 0)) {
+ spin_unlock_irqrestore(&sd->sd_rlock, flags);
+ scdrv_dispatch_event(sd->sd_rb, len);
+ len = CHUNKSIZE;
+ spin_lock_irqsave(&sd->sd_rlock, flags);
+ status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
+ sd->sd_rb, &len);
+ }
+ spin_unlock_irqrestore(&sd->sd_rlock, flags);
+}
+
+
+/*
+ * scdrv_event_init
+ *
+ * Sets up a system controller subchannel to begin receiving event
+ * messages. This is sort of a specialized version of scdrv_open()
+ * in drivers/char/sn_sysctl.c.
+ */
+void
+scdrv_event_init(struct sysctl_data_s *scd)
+{
+ int rv;
+
+ event_sd = kmalloc(sizeof (struct subch_data_s), GFP_KERNEL);
+ if (event_sd == NULL) {
+ printk(KERN_WARNING "%s: couldn't allocate subchannel info"
+ " for event monitoring\n", __FUNCTION__);
+ return;
+ }
+
+ /* initialize subch_data_s fields */
+ memset(event_sd, 0, sizeof (struct subch_data_s));
+ event_sd->sd_nasid = scd->scd_nasid;
+ spin_lock_init(&event_sd->sd_rlock);
+
+ /* ask the system controllers to send events to this node */
+ event_sd->sd_subch = ia64_sn_sysctl_event_init(scd->scd_nasid);
+
+ if (event_sd->sd_subch < 0) {
+ kfree(event_sd);
+ printk(KERN_WARNING "%s: couldn't open event subchannel\n",
+ __FUNCTION__);
+ return;
+ }
+
+ /* hook event subchannel up to the system controller interrupt */
+ rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
+ SA_SHIRQ | SA_INTERRUPT,
+ "system controller events", event_sd);
+ if (rv) {
+ printk(KERN_WARNING "%s: irq request failed (%d)\n",
+ __FUNCTION__, rv);
+ ia64_sn_irtr_close(event_sd->sd_nasid, event_sd->sd_subch);
+ kfree(event_sd);
+ return;
+ }
+}
+
+
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