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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1a402aaca5
It's been pointed out that environmental events from the system controllers on Altix machines cause the kernel to complain about unaligned memory accesses. This turns out to be because "be32_to_cpup()" didn't do everything I thought/hoped it did. I've added calls to pull the offending integers out of the buffers using get_unaligned() before feeding them to be32_to_cpup(). Signed-off-by: Greg Howard <ghoward@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
310 lines
7.4 KiB
C
310 lines
7.4 KiB
C
/*
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* SN Platform system controller communication support
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
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*/
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/*
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* System controller event handler
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*
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* These routines deal with environmental events arriving from the
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* system controllers.
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*/
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/byteorder/generic.h>
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#include <asm/sn/sn_sal.h>
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#include <asm/unaligned.h>
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#include "snsc.h"
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static struct subch_data_s *event_sd;
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void scdrv_event(unsigned long);
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DECLARE_TASKLET(sn_sysctl_event, scdrv_event, 0);
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/*
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* scdrv_event_interrupt
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*
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* Pull incoming environmental events off the physical link to the
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* system controller and put them in a temporary holding area in SAL.
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* Schedule scdrv_event() to move them along to their ultimate
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* destination.
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*/
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static irqreturn_t
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scdrv_event_interrupt(int irq, void *subch_data, struct pt_regs *regs)
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{
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struct subch_data_s *sd = subch_data;
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unsigned long flags;
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int status;
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spin_lock_irqsave(&sd->sd_rlock, flags);
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status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);
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if ((status > 0) && (status & SAL_IROUTER_INTR_RECV)) {
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tasklet_schedule(&sn_sysctl_event);
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}
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spin_unlock_irqrestore(&sd->sd_rlock, flags);
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return IRQ_HANDLED;
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}
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/*
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* scdrv_parse_event
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*
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* Break an event (as read from SAL) into useful pieces so we can decide
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* what to do with it.
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*/
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static int
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scdrv_parse_event(char *event, int *src, int *code, int *esp_code, char *desc)
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{
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char *desc_end;
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__be32 from_buf;
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/* record event source address */
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from_buf = get_unaligned((__be32 *)event);
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*src = be32_to_cpup(&from_buf);
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event += 4; /* move on to event code */
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/* record the system controller's event code */
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from_buf = get_unaligned((__be32 *)event);
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*code = be32_to_cpup(&from_buf);
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event += 4; /* move on to event arguments */
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/* how many arguments are in the packet? */
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if (*event++ != 2) {
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/* if not 2, give up */
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return -1;
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}
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/* parse out the ESP code */
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if (*event++ != IR_ARG_INT) {
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/* not an integer argument, so give up */
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return -1;
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}
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from_buf = get_unaligned((__be32 *)event);
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*esp_code = be32_to_cpup(&from_buf);
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event += 4;
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/* parse out the event description */
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if (*event++ != IR_ARG_ASCII) {
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/* not an ASCII string, so give up */
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return -1;
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}
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event[CHUNKSIZE-1] = '\0'; /* ensure this string ends! */
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event += 2; /* skip leading CR/LF */
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desc_end = desc + sprintf(desc, "%s", event);
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/* strip trailing CR/LF (if any) */
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for (desc_end--;
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(desc_end != desc) && ((*desc_end == 0xd) || (*desc_end == 0xa));
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desc_end--) {
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*desc_end = '\0';
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}
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return 0;
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}
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/*
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* scdrv_event_severity
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*
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* Figure out how urgent a message we should write to the console/syslog
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* via printk.
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*/
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static char *
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scdrv_event_severity(int code)
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{
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int ev_class = (code & EV_CLASS_MASK);
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int ev_severity = (code & EV_SEVERITY_MASK);
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char *pk_severity = KERN_NOTICE;
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switch (ev_class) {
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case EV_CLASS_POWER:
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switch (ev_severity) {
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case EV_SEVERITY_POWER_LOW_WARNING:
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case EV_SEVERITY_POWER_HIGH_WARNING:
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pk_severity = KERN_WARNING;
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break;
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case EV_SEVERITY_POWER_HIGH_FAULT:
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case EV_SEVERITY_POWER_LOW_FAULT:
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pk_severity = KERN_ALERT;
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break;
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}
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break;
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case EV_CLASS_FAN:
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switch (ev_severity) {
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case EV_SEVERITY_FAN_WARNING:
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pk_severity = KERN_WARNING;
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break;
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case EV_SEVERITY_FAN_FAULT:
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pk_severity = KERN_CRIT;
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break;
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}
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break;
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case EV_CLASS_TEMP:
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switch (ev_severity) {
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case EV_SEVERITY_TEMP_ADVISORY:
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pk_severity = KERN_WARNING;
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break;
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case EV_SEVERITY_TEMP_CRITICAL:
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pk_severity = KERN_CRIT;
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break;
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case EV_SEVERITY_TEMP_FAULT:
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pk_severity = KERN_ALERT;
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break;
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}
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break;
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case EV_CLASS_ENV:
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pk_severity = KERN_ALERT;
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break;
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case EV_CLASS_TEST_FAULT:
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pk_severity = KERN_ALERT;
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break;
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case EV_CLASS_TEST_WARNING:
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pk_severity = KERN_WARNING;
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break;
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case EV_CLASS_PWRD_NOTIFY:
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pk_severity = KERN_ALERT;
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break;
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}
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return pk_severity;
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}
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/*
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* scdrv_dispatch_event
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*
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* Do the right thing with an incoming event. That's often nothing
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* more than printing it to the system log. For power-down notifications
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* we start a graceful shutdown.
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*/
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static void
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scdrv_dispatch_event(char *event, int len)
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{
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int code, esp_code, src;
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char desc[CHUNKSIZE];
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char *severity;
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if (scdrv_parse_event(event, &src, &code, &esp_code, desc) < 0) {
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/* ignore uninterpretible event */
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return;
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}
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/* how urgent is the message? */
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severity = scdrv_event_severity(code);
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if ((code & EV_CLASS_MASK) == EV_CLASS_PWRD_NOTIFY) {
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struct task_struct *p;
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/* give a SIGPWR signal to init proc */
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/* first find init's task */
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read_lock(&tasklist_lock);
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for_each_process(p) {
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if (p->pid == 1)
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break;
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}
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if (p) { /* we found init's task */
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printk(KERN_EMERG "Power off indication received. Initiating power fail sequence...\n");
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force_sig(SIGPWR, p);
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} else { /* failed to find init's task - just give message(s) */
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printk(KERN_WARNING "Failed to find init proc to handle power off!\n");
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printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
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}
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read_unlock(&tasklist_lock);
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} else {
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/* print to system log */
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printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
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}
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}
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/*
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* scdrv_event
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*
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* Called as a tasklet when an event arrives from the L1. Read the event
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* from where it's temporarily stored in SAL and call scdrv_dispatch_event()
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* to send it on its way. Keep trying to read events until SAL indicates
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* that there are no more immediately available.
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*/
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void
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scdrv_event(unsigned long dummy)
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{
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int status;
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int len;
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unsigned long flags;
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struct subch_data_s *sd = event_sd;
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/* anything to read? */
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len = CHUNKSIZE;
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spin_lock_irqsave(&sd->sd_rlock, flags);
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status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
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sd->sd_rb, &len);
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while (!(status < 0)) {
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spin_unlock_irqrestore(&sd->sd_rlock, flags);
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scdrv_dispatch_event(sd->sd_rb, len);
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len = CHUNKSIZE;
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spin_lock_irqsave(&sd->sd_rlock, flags);
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status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
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sd->sd_rb, &len);
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}
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spin_unlock_irqrestore(&sd->sd_rlock, flags);
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}
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/*
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* scdrv_event_init
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*
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* Sets up a system controller subchannel to begin receiving event
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* messages. This is sort of a specialized version of scdrv_open()
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* in drivers/char/sn_sysctl.c.
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*/
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void
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scdrv_event_init(struct sysctl_data_s *scd)
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{
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int rv;
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event_sd = kmalloc(sizeof (struct subch_data_s), GFP_KERNEL);
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if (event_sd == NULL) {
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printk(KERN_WARNING "%s: couldn't allocate subchannel info"
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" for event monitoring\n", __FUNCTION__);
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return;
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}
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/* initialize subch_data_s fields */
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memset(event_sd, 0, sizeof (struct subch_data_s));
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event_sd->sd_nasid = scd->scd_nasid;
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spin_lock_init(&event_sd->sd_rlock);
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/* ask the system controllers to send events to this node */
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event_sd->sd_subch = ia64_sn_sysctl_event_init(scd->scd_nasid);
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if (event_sd->sd_subch < 0) {
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kfree(event_sd);
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printk(KERN_WARNING "%s: couldn't open event subchannel\n",
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__FUNCTION__);
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return;
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}
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/* hook event subchannel up to the system controller interrupt */
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rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
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SA_SHIRQ | SA_INTERRUPT,
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"system controller events", event_sd);
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if (rv) {
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printk(KERN_WARNING "%s: irq request failed (%d)\n",
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__FUNCTION__, rv);
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ia64_sn_irtr_close(event_sd->sd_nasid, event_sd->sd_subch);
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kfree(event_sd);
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return;
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}
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}
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