Date: Thu, 28 Aug 2008 23:47:41 -0600
From: jmerkey@wolfmountaingroup.com
Message-Id: <200808290547.m7T5lfkx016123@wolfmountaingroup.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH 2.6.27-rc5 8/29] mdb: add mdb-ia32-apic.c Intel x86 architecure functions
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 7949
Lines: 299

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@wolfmountaingroup.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@wolfmountaingroup.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@wolfmountaingroup.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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