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Date: Thu, 28 Aug 2008 23:47:41 -0600
From: jmerkey@...fmountaingroup.com
To: linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.27-rc5 8/29] mdb: add mdb-ia32-apic.c Intel x86 architecure functions
add mdb-ia32-apic.c Intel x86 architecure functions.
add support to dump local APIC and IOAPIC registers.
Instrument support for remote read of local apic registers.
Add support for hardware NMI assertion for debugging a hard
hung processor.
Signed-off-by: Jeffrey Vernon Merkey (jmerkey@...fmountaingroup.com)
--- a/debug/mdb/mdb-ia32-apic.c 1969-12-31 17:00:00.000000000 -0700
+++ b/debug/mdb/mdb-ia32-apic.c 2008-08-28 14:20:04.000000000 -0600
@@ -0,0 +1,280 @@
+
+/***************************************************************************
+*
+* Copyright (c) 2008 Jeff V. Merkey All Rights Reserved.
+* 1058 East 50 South
+* Lindon, Utah 84042
+* jmerkey@...fmountaingroup.com
+*
+* This program is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License as published by the
+* Free Software Foundation, version 2.
+*
+* This program is distributed in the hope that it will be useful, but
+* WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+* General Public License for more details.
+*
+* You are free to modify and re-distribute this program in accordance
+* with the terms specified in the GNU Public License. The copyright
+* contained in this code is required to be present in any derivative
+* works and you are required to provide the source code for this
+* program as part of any commercial or non-commercial distribution.
+* You are required to respect the rights of the Copyright holders
+* named within this code.
+*
+* jmerkey@...fmountaingroup.com is the official maintainer of
+* this code. You are encouraged to report any bugs, problems, fixes,
+* suggestions, and comments about this software.
+*
+* AUTHOR : Jeff V. Merkey
+* DESCRIP : Merkey's Linux Debugger
+*
+***************************************************************************/
+
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/genhd.h>
+#include <linux/hdreg.h>
+#include <linux/fs.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/cdrom.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/ctype.h>
+#include <linux/keyboard.h>
+#include <linux/console.h>
+#include <linux/serial_reg.h>
+#include <linux/uaccess.h>
+#include <linux/nmi.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/atomic.h>
+#include <asm/msr.h>
+#include <linux/io.h>
+#include <linux/clocksource.h>
+
+#ifdef CONFIG_SMP
+#include <mach_apic.h>
+#include <mach_ipi.h>
+#endif
+
+#define __KERNEL_SYSCALLS__
+#include <linux/unistd.h>
+#include <linux/kallsyms.h>
+
+#include "mdb.h"
+#include "mdb-ia32.h"
+#include "mdb-list.h"
+#include "mdb-ia32-proc.h"
+#include "mdb-base.h"
+#include "mdb-proc.h"
+#include "mdb-os.h"
+#include "mdb-keyboard.h"
+
+#if defined(CONFIG_SMP)
+
+extern unsigned int io_apic_read(unsigned int apic, unsigned int reg);
+extern int nr_ioapics;
+
+unsigned long apic_directed_nmi(unsigned long cpu)
+{
+ send_IPI_mask(cpumask_of_cpu(cpu),
+ APIC_DM_NMI | APIC_INT_LEVELTRIG | APIC_INT_ASSERT);
+ send_IPI_mask(cpumask_of_cpu(cpu),
+ APIC_DM_NMI | APIC_INT_LEVELTRIG);
+ return 0;
+}
+
+void dump_ioapic(unsigned long num)
+{
+ unsigned long i, val;
+
+ if (num < nr_ioapics)
+ {
+ DBGPrint("io_apic registers\n");
+ for (i = 0; i <= 0x2F; i++)
+ {
+ if ((i & 3) == 0)
+ DBGPrint("%08X: ", i);
+
+ val = io_apic_read(num, i * 4);
+ DBGPrint("%08X ", val);
+
+ if ((i & 3) == 3)
+ DBGPrint("\n");
+ }
+ }
+ return;
+}
+
+void dump_local_apic(void)
+{
+ unsigned long i, val;
+
+ DBGPrint("local apic registers\n");
+ for (i = 0; i <= 0x3F; i++)
+ {
+ if ((i & 3) == 0)
+ DBGPrint("%08X: ", i);
+
+ val = apic_read(i * 4);
+ DBGPrint("%08X ", val);
+
+ if ((i & 3) == 3)
+ DBGPrint("\n");
+ }
+
+}
+
+void dump_remote_apic(unsigned long cpu)
+{
+ register unsigned long i, timeout, apicid;
+ register unsigned long val;
+
+ DBGPrint("remote apic registers processor(%d)\n", cpu);
+ for (i = 0; i <= 0x3F; i++)
+ {
+ if ((i & 3) == 0)
+ DBGPrint("%08X: ", i);
+
+ apicid = cpu_present_to_apicid(cpu);
+ if (apicid == BAD_APICID)
+ {
+ DBGPrint("BADAPICX ");
+ continue;
+ }
+
+ timeout = 0;
+ while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
+ {
+ udelay(100);
+ if (timeout++ >= 1000)
+ break;
+ cpu_relax();
+ touch_nmi_watchdog();
+ }
+
+ if (timeout >= 1000)
+ {
+ DBGPrint("???????? ");
+ continue;
+ }
+
+ apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(apicid));
+ apic_write(APIC_ICR, i | APIC_DEST_LOGICAL | APIC_DM_REMRD);
+
+ timeout = 0;
+ while ((apic_read(APIC_ICR) & APIC_ICR_RR_MASK) == APIC_ICR_RR_INPROG)
+ {
+ udelay(100);
+ if (timeout++ >= 1000)
+ break;
+
+ cpu_relax();
+ touch_nmi_watchdog();
+ }
+
+ if (timeout >= 1000)
+ {
+ DBGPrint("???????? ");
+ continue;
+ }
+
+ if ((apic_read(APIC_ICR) & APIC_ICR_RR_MASK) == APIC_ICR_RR_VALID)
+ {
+ val = apic_read(APIC_RRR);
+ DBGPrint("%08X ", val);
+ }
+ else
+ {
+ DBGPrint("???????? ");
+ }
+
+ if ((i & 3) == 3)
+ DBGPrint("\n");
+ }
+
+}
+
+unsigned long displayAPICHelp(unsigned char *commandLine, DEBUGGER_PARSER *parser)
+{
+ DBGPrint("apic - display local apic regs\n");
+ DBGPrint("apic [p#] - display remote apic regs\n");
+ return 1;
+}
+
+/* APIC */
+
+unsigned long displayAPICInfo(unsigned char *cmd,
+ StackFrame *stackFrame, unsigned long Exception,
+ DEBUGGER_PARSER *parser)
+{
+ register unsigned long value;
+ unsigned long valid;
+
+ cmd = &cmd[parser->debugCommandNameLength];
+ while (*cmd && *cmd == ' ')
+ cmd++;
+
+ value = EvaluateExpression(stackFrame, &cmd, &valid);
+ if (valid && ((value >= MAX_PROCESSORS) || !cpu_online(value)))
+ {
+ DBGPrint("processor not found\n");
+ return 1;
+ }
+ if (valid && (value != get_processor_id()))
+ dump_remote_apic(value);
+ else
+ dump_local_apic();
+ return 1;
+}
+
+unsigned long displayIOAPICHelp(unsigned char *commandLine, DEBUGGER_PARSER *parser)
+{
+ DBGPrint("ioapic [#] - display specified ioapic [#] regs\n");
+ return 1;
+}
+
+/* IOAPIC */
+
+unsigned long displayIOAPICInfo(unsigned char *cmd,
+ StackFrame *stackFrame, unsigned long Exception,
+ DEBUGGER_PARSER *parser)
+{
+ register unsigned long value;
+ unsigned long valid;
+
+ cmd = &cmd[parser->debugCommandNameLength];
+ while (*cmd && *cmd == ' ')
+ cmd++;
+
+ value = EvaluateExpression(stackFrame, &cmd, &valid);
+ if (valid && !(value < nr_ioapics))
+ {
+ DBGPrint("ioapic not found\n");
+ return 1;
+ }
+ if (valid)
+ dump_ioapic(value);
+ else
+ dump_ioapic(0);
+ return 1;
+
+}
+
+#endif /* CONFIG_SMP */
--
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