x86/UV: Add kdump to UV NMI handler

If a system has hung and it no longer responds to external
events, this patch adds the capability of doing a standard kdump
and system reboot then triggered by the system NMI command.

It is enabled when the nmi action is changed to "kdump" and the
kernel is built with CONFIG_KEXEC enabled.

Signed-off-by: Mike Travis <travis@sgi.com>
Reviewed-by: Dimitri Sivanich <sivanich@sgi.com>
Reviewed-by: Hedi Berriche <hedi@sgi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Jason Wessel <jason.wessel@windriver.com>
Link: http://lkml.kernel.org/r/20130923212500.660567460@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index 4efcde1b9d54..2579fbd6b95c 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -21,6 +21,7 @@
 
 #include <linux/cpu.h>
 #include <linux/delay.h>
+#include <linux/kexec.h>
 #include <linux/module.h>
 #include <linux/nmi.h>
 #include <linux/sched.h>
@@ -70,6 +71,7 @@ static atomic_t	uv_in_nmi;
 static atomic_t uv_nmi_cpu = ATOMIC_INIT(-1);
 static atomic_t uv_nmi_cpus_in_nmi = ATOMIC_INIT(-1);
 static atomic_t uv_nmi_slave_continue;
+static atomic_t uv_nmi_kexec_failed;
 static cpumask_var_t uv_nmi_cpu_mask;
 
 /* Values for uv_nmi_slave_continue */
@@ -143,6 +145,7 @@ module_param_named(retry_count, uv_nmi_retry_count, int, 0644);
  * Valid NMI Actions:
  *  "dump"      - dump process stack for each cpu
  *  "ips"       - dump IP info for each cpu
+ *  "kdump"     - do crash dump
  */
 static char uv_nmi_action[8] = "dump";
 module_param_string(action, uv_nmi_action, sizeof(uv_nmi_action), 0644);
@@ -496,6 +499,40 @@ static void uv_nmi_touch_watchdogs(void)
         touch_nmi_watchdog();
 }
 
+#if defined(CONFIG_KEXEC)
+static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
+{
+        /* Call crash to dump system state */
+        if (master) {
+                pr_emerg("UV: NMI executing crash_kexec on CPU%d\n", cpu);
+                crash_kexec(regs);
+
+                pr_emerg("UV: crash_kexec unexpectedly returned, ");
+                if (!kexec_crash_image) {
+                        pr_cont("crash kernel not loaded\n");
+                        atomic_set(&uv_nmi_kexec_failed, 1);
+                        uv_nmi_sync_exit(1);
+                        return;
+                }
+                pr_cont("kexec busy, stalling cpus while waiting\n");
+        }
+
+        /* If crash exec fails the slaves should return, otherwise stall */
+        while (atomic_read(&uv_nmi_kexec_failed) == 0)
+                mdelay(10);
+
+        /* Crash kernel most likely not loaded, return in an orderly fashion */
+        uv_nmi_sync_exit(0);
+}
+
+#else /* !CONFIG_KEXEC */
+static inline void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
+{
+        if (master)
+                pr_err("UV: NMI kdump: KEXEC not supported in this kernel\n");
+}
+#endif /* !CONFIG_KEXEC */
+
 /*
  * UV NMI handler
  */
@@ -517,6 +554,10 @@ int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
         /* Indicate we are the first CPU into the NMI handler */
         master = (atomic_read(&uv_nmi_cpu) == cpu);
 
+        /* If NMI action is "kdump", then attempt to do it */
+        if (uv_nmi_action_is("kdump"))
+                uv_nmi_kdump(cpu, master, regs);
+
         /* Pause as all cpus enter the NMI handler */
         uv_nmi_wait(master);