1 files changed, 128 insertions, 66 deletions

diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
index 9e248ef6cc6..c4dfccd3a3d 100644
--- a/arch/powerpc/platforms/pseries/ras.c
+++ b/arch/powerpc/platforms/pseries/ras.c
@@ -16,36 +16,15 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
-/* Change Activity:
- * 2001/09/21 : engebret : Created with minimal EPOW and HW exception support.
- * End Change Activity
- */
-
-#include <linux/errno.h>
-#include <linux/threads.h>
-#include <linux/kernel_stat.h>
-#include <linux/signal.h>
 #include <linux/sched.h>
-#include <linux/ioport.h>
 #include <linux/interrupt.h>
-#include <linux/timex.h>
-#include <linux/init.h>
-#include <linux/delay.h>
 #include <linux/irq.h>
-#include <linux/random.h>
-#include <linux/sysrq.h>
-#include <linux/bitops.h>
-
-#include <asm/uaccess.h>
-#include <asm/io.h>
-#include <asm/pgtable.h>
-#include <asm/irq.h>
-#include <asm/cache.h>
-#include <asm/prom.h>
-#include <asm/ptrace.h>
+#include <linux/of.h>
+#include <linux/fs.h>
+#include <linux/reboot.h>
+
 #include <asm/machdep.h>
 #include <asm/rtas.h>
-#include <asm/udbg.h>
 #include <asm/firmware.h>
 
 #include "pseries.h"
@@ -56,7 +35,6 @@ static DEFINE_SPINLOCK(ras_log_buf_lock);
 static char global_mce_data_buf[RTAS_ERROR_LOG_MAX];
 static DEFINE_PER_CPU(__u64, mce_data_buf);
 
-static int ras_get_sensor_state_token;
 static int ras_check_exception_token;
 
 #define EPOW_SENSOR_TOKEN       9
@@ -74,7 +52,6 @@ static int __init init_ras_IRQ(void)
 {
         struct device_node *np;
 
-        ras_get_sensor_state_token = rtas_token("get-sensor-state");
         ras_check_exception_token = rtas_token("check-exception");
 
         /* Internal Errors */
@@ -94,26 +71,126 @@ static int __init init_ras_IRQ(void)
 
         return 0;
 }
-__initcall(init_ras_IRQ);
+subsys_initcall(init_ras_IRQ);
 
-/*
- * Handle power subsystem events (EPOW).
- *
- * Presently we just log the event has occurred.  This should be fixed
- * to examine the type of power failure and take appropriate action where
- * the time horizon permits something useful to be done.
- */
+#define EPOW_SHUTDOWN_NORMAL                            1
+#define EPOW_SHUTDOWN_ON_UPS                            2
+#define EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS        3
+#define EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH      4
+
+static void handle_system_shutdown(char event_modifier)
+{
+        switch (event_modifier) {
+        case EPOW_SHUTDOWN_NORMAL:
+                pr_emerg("Firmware initiated power off");
+                orderly_poweroff(1);
+                break;
+
+        case EPOW_SHUTDOWN_ON_UPS:
+                pr_emerg("Loss of power reported by firmware, system is "
+                        "running on UPS/battery");
+                break;
+
+        case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS:
+                pr_emerg("Loss of system critical functions reported by "
+                        "firmware");
+                pr_emerg("Check RTAS error log for details");
+                orderly_poweroff(1);
+                break;
+
+        case EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH:
+                pr_emerg("Ambient temperature too high reported by firmware");
+                pr_emerg("Check RTAS error log for details");
+                orderly_poweroff(1);
+                break;
+
+        default:
+                pr_err("Unknown power/cooling shutdown event (modifier %d)",
+                        event_modifier);
+        }
+}
+
+struct epow_errorlog {
+        unsigned char sensor_value;
+        unsigned char event_modifier;
+        unsigned char extended_modifier;
+        unsigned char reserved;
+        unsigned char platform_reason;
+};
+
+#define EPOW_RESET                      0
+#define EPOW_WARN_COOLING               1
+#define EPOW_WARN_POWER                 2
+#define EPOW_SYSTEM_SHUTDOWN            3
+#define EPOW_SYSTEM_HALT                4
+#define EPOW_MAIN_ENCLOSURE             5
+#define EPOW_POWER_OFF                  7
+
+void rtas_parse_epow_errlog(struct rtas_error_log *log)
+{
+        struct pseries_errorlog *pseries_log;
+        struct epow_errorlog *epow_log;
+        char action_code;
+        char modifier;
+
+        pseries_log = get_pseries_errorlog(log, PSERIES_ELOG_SECT_ID_EPOW);
+        if (pseries_log == NULL)
+                return;
+
+        epow_log = (struct epow_errorlog *)pseries_log->data;
+        action_code = epow_log->sensor_value & 0xF;     /* bottom 4 bits */
+        modifier = epow_log->event_modifier & 0xF;      /* bottom 4 bits */
+
+        switch (action_code) {
+        case EPOW_RESET:
+                pr_err("Non critical power or cooling issue cleared");
+                break;
+
+        case EPOW_WARN_COOLING:
+                pr_err("Non critical cooling issue reported by firmware");
+                pr_err("Check RTAS error log for details");
+                break;
+
+        case EPOW_WARN_POWER:
+                pr_err("Non critical power issue reported by firmware");
+                pr_err("Check RTAS error log for details");
+                break;
+
+        case EPOW_SYSTEM_SHUTDOWN:
+                handle_system_shutdown(epow_log->event_modifier);
+                break;
+
+        case EPOW_SYSTEM_HALT:
+                pr_emerg("Firmware initiated power off");
+                orderly_poweroff(1);
+                break;
+
+        case EPOW_MAIN_ENCLOSURE:
+        case EPOW_POWER_OFF:
+                pr_emerg("Critical power/cooling issue reported by firmware");
+                pr_emerg("Check RTAS error log for details");
+                pr_emerg("Immediate power off");
+                emergency_sync();
+                kernel_power_off();
+                break;
+
+        default:
+                pr_err("Unknown power/cooling event (action code %d)",
+                        action_code);
+        }
+}
+
+/* Handle environmental and power warning (EPOW) interrupts. */
 static irqreturn_t ras_epow_interrupt(int irq, void *dev_id)
 {
-        int status = 0xdeadbeef;
-        int state = 0;
+        int status;
+        int state;
         int critical;
 
-        status = rtas_call(ras_get_sensor_state_token, 2, 2, &state,
-                           EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX);
+        status = rtas_get_sensor(EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX, &state);
 
         if (state > 3)
-                critical = 1;  /* Time Critical */
+                critical = 1;           /* Time Critical */
         else
                 critical = 0;
 
@@ -122,18 +199,14 @@ static irqreturn_t ras_epow_interrupt(int irq, void *dev_id)
         status = rtas_call(ras_check_exception_token, 6, 1, NULL,
                            RTAS_VECTOR_EXTERNAL_INTERRUPT,
                            virq_to_hw(irq),
-                           RTAS_EPOW_WARNING | RTAS_POWERMGM_EVENTS,
+                           RTAS_EPOW_WARNING,
                            critical, __pa(&ras_log_buf),
                                 rtas_get_error_log_max());
 
-        udbg_printf("EPOW <0x%lx 0x%x 0x%x>\n",
-                    *((unsigned long *)&ras_log_buf), status, state);
-        printk(KERN_WARNING "EPOW <0x%lx 0x%x 0x%x>\n",
-               *((unsigned long *)&ras_log_buf), status, state);
-
-        /* format and print the extended information */
         log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0);
 
+        rtas_parse_epow_errlog((struct rtas_error_log *)ras_log_buf);
+
         spin_unlock(&ras_log_buf_lock);
         return IRQ_HANDLED;
 }
@@ -149,7 +222,7 @@ static irqreturn_t ras_epow_interrupt(int irq, void *dev_id)
 static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
 {
         struct rtas_error_log *rtas_elog;
-        int status = 0xdeadbeef;
+        int status;
         int fatal;
 
         spin_lock(&ras_log_buf_lock);
@@ -157,7 +230,7 @@ static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
         status = rtas_call(ras_check_exception_token, 6, 1, NULL,
                            RTAS_VECTOR_EXTERNAL_INTERRUPT,
                            virq_to_hw(irq),
-                           RTAS_INTERNAL_ERROR, 1 /*Time Critical */,
+                           RTAS_INTERNAL_ERROR, 1 /* Time Critical */,
                            __pa(&ras_log_buf),
                                 rtas_get_error_log_max());
 
@@ -172,24 +245,13 @@ static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
         log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal);
 
         if (fatal) {
-                udbg_printf("Fatal HW Error <0x%lx 0x%x>\n",
-                            *((unsigned long *)&ras_log_buf), status);
-                printk(KERN_EMERG "Error: Fatal hardware error <0x%lx 0x%x>\n",
-                       *((unsigned long *)&ras_log_buf), status);
-
-#ifndef DEBUG_RTAS_POWER_OFF
-                /* Don't actually power off when debugging so we can test
-                 * without actually failing while injecting errors.
-                 * Error data will not be logged to syslog.
-                 */
-                ppc_md.power_off();
-#endif
+                pr_emerg("Fatal hardware error reported by firmware");
+                pr_emerg("Check RTAS error log for details");
+                pr_emerg("Immediate power off");
+                emergency_sync();
+                kernel_power_off();
         } else {
-                udbg_printf("Recoverable HW Error <0x%lx 0x%x>\n",
-                            *((unsigned long *)&ras_log_buf), status);
-                printk(KERN_WARNING
-                       "Warning: Recoverable hardware error <0x%lx 0x%x>\n",
-                       *((unsigned long *)&ras_log_buf), status);
+                pr_err("Recoverable hardware error reported by firmware");
         }
 
         spin_unlock(&ras_log_buf_lock);