@@ -154,7 +154,8 @@
#define OPAL_FLASH_WRITE 111
#define OPAL_FLASH_ERASE 112
#define OPAL_PRD_MSG 113
-#define OPAL_LAST 113
+#define OPAL_CEC_REBOOT2 116
+#define OPAL_LAST 116
/* Device tree flags */
@@ -817,6 +818,12 @@ struct opal_i2c_request {
__be64 buffer_ra; /* Buffer real address */
};
+/* Argument to OPAL_CEC_REBOOT2() */
+enum {
+ OPAL_REBOOT_NORMAL = 0,
+ OPAL_REBOOT_PLATFORM_ERROR = 1,
+};
+
#endif /* __ASSEMBLY__ */
#endif /* __OPAL_API_H */
@@ -44,6 +44,7 @@ int64_t opal_tpo_write(uint64_t token, uint32_t year_mon_day,
uint32_t hour_min);
int64_t opal_cec_power_down(uint64_t request);
int64_t opal_cec_reboot(void);
+int64_t opal_cec_reboot2(uint32_t reboot_type, char *diag);
int64_t opal_read_nvram(uint64_t buffer, uint64_t size, uint64_t offset);
int64_t opal_write_nvram(uint64_t buffer, uint64_t size, uint64_t offset);
int64_t opal_handle_interrupt(uint64_t isn, __be64 *outstanding_event_mask);
@@ -200,6 +200,7 @@ OPAL_CALL(opal_rtc_read, OPAL_RTC_READ);
OPAL_CALL(opal_rtc_write, OPAL_RTC_WRITE);
OPAL_CALL(opal_cec_power_down, OPAL_CEC_POWER_DOWN);
OPAL_CALL(opal_cec_reboot, OPAL_CEC_REBOOT);
+OPAL_CALL(opal_cec_reboot2, OPAL_CEC_REBOOT2);
OPAL_CALL(opal_read_nvram, OPAL_READ_NVRAM);
OPAL_CALL(opal_write_nvram, OPAL_WRITE_NVRAM);
OPAL_CALL(opal_handle_interrupt, OPAL_HANDLE_INTERRUPT);
@@ -441,6 +441,7 @@ static int opal_recover_mce(struct pt_regs *regs,
int opal_machine_check(struct pt_regs *regs)
{
struct machine_check_event evt;
+ int ret;
if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
return 0;
@@ -455,6 +456,40 @@ int opal_machine_check(struct pt_regs *regs)
if (opal_recover_mce(regs, &evt))
return 1;
+
+ /*
+ * Unrecovered machine check, we are heading to panic path.
+ *
+ * We may have hit this MCE in very early stage of kernel
+ * initialization even before opal-prd has started running. If
+ * this is the case then this MCE error may go un-noticed or
+ * un-analyzed if we go down panic path. We need to inform
+ * BMC/OCC about this error so that they can collect relevant
+ * data for error analysis before rebooting.
+ * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so.
+ * This function may not return on BMC based system.
+ */
+ ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR,
+ "Unrecoverable Machine Check exception");
+ if (ret == OPAL_UNSUPPORTED) {
+ pr_emerg("Reboot type %d not supported\n",
+ OPAL_REBOOT_PLATFORM_ERROR);
+ }
+
+ /*
+ * We reached here. There can be three possibilities:
+ * 1. We are running on a firmware level that do not support
+ * opal_cec_reboot2()
+ * 2. We are running on a firmware level that do not support
+ * OPAL_REBOOT_PLATFORM_ERROR reboot type.
+ * 3. We are running on FSP based system that does not need opal
+ * to trigger checkstop explicitly for error analysis. The FSP
+ * PRD component would have already got notified about this
+ * error through other channels.
+ *
+ * In any case, let us just fall through. We anyway heading
+ * down to panic path.
+ */
return 0;
}