opal: Add opal call to handle HMI.

With new proposed change, Linux will get the HMI interrupt directly. Linux
will then invoke opal_handle_hmi to handle HMI recovery in opal. After
handling HMI errors, opal will generate an OPAL HMI event and queue it up
in opal message infrastructure so that Linux host can pull the event
and act upon it accordingly. This patch also adds new message type for
HMI event.

Changes in v2:
- Removed the token argument from opal_handle_hmi()

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 48 insertions, 2 deletions

diff --git a/include/opal.h b/include/opal.h
index 22f6a9f..4833726 100644
--- a/include/opal.h
+++ b/include/opal.h
@@ -133,7 +133,8 @@
 #define OPAL_WRITE_OPPANEL_ASYNC		95
 #define OPAL_PCI_ERR_INJCT			96
 #define OPAL_PCI_EEH_FREEZE_SET			97
-#define OPAL_LAST				97
+#define OPAL_HANDLE_HMI				98
+#define OPAL_LAST				98
 
 #ifndef __ASSEMBLY__
 
@@ -429,6 +430,7 @@ enum OpalMessageType {
 	OPAL_MSG_MEM_ERR,
 	OPAL_MSG_EPOW,
 	OPAL_MSG_SHUTDOWN,
+	OPAL_MSG_HMI_EVT,
 	OPAL_MSG_TYPE_MAX,
 };
 
@@ -544,6 +546,50 @@ struct OpalMemoryErrorData {
 	} u;
 };
 
+/* HMI interrupt event */
+enum OpalHMI_Version {
+	OpalHMIEvt_V1 = 1,
+};
+
+enum OpalHMI_Severity {
+	OpalHMI_SEV_NO_ERROR = 0,
+	OpalHMI_SEV_WARNING = 1,
+	OpalHMI_SEV_ERROR_SYNC = 2,
+	OpalHMI_SEV_FATAL = 3,
+};
+
+enum OpalHMI_Disposition {
+	OpalHMI_DISPOSITION_RECOVERED = 0,
+	OpalHMI_DISPOSITION_NOT_RECOVERED = 1,
+};
+
+enum OpalHMI_ErrType {
+	OpalHMI_ERROR_MALFUNC_ALERT	= 0,
+	OpalHMI_ERROR_PROC_RECOV_DONE,
+	OpalHMI_ERROR_PROC_RECOV_DONE_AGAIN,
+	OpalHMI_ERROR_PROC_RECOV_MASKED,
+	OpalHMI_ERROR_TFAC,
+	OpalHMI_ERROR_TFMR_PARITY,
+	OpalHMI_ERROR_HA_OVERFLOW_WARN,
+	OpalHMI_ERROR_XSCOM_FAIL,
+	OpalHMI_ERROR_XSCOM_DONE,
+	OpalHMI_ERROR_SCOM_FIR,
+	OpalHMI_ERROR_DEBUG_TRIG_FIR,
+	OpalHMI_ERROR_HYP_RESOURCE,
+};
+
+struct OpalHMIEvent {
+	uint8_t		version;	/* 0x00 */
+	uint8_t		severity;	/* 0x01 */
+	uint8_t		type;		/* 0x02 */
+	uint8_t		disposition;	/* 0x03 */
+	uint8_t		reserved_1[4];	/* 0x04 */
+
+	uint64_t	hmer;
+	/* TFMR register. Valid only for TFAC and TFMR_PARITY error type. */
+	uint64_t	tfmr;
+};
+
 enum {
 	OPAL_P7IOC_DIAG_TYPE_NONE	= 0,
 	OPAL_P7IOC_DIAG_TYPE_RGC	= 1,
@@ -831,7 +877,7 @@ extern void opal_del_host_sync_notifier(bool (*notify)(void *data));
 /*
  * Opal internal function prototype
  */
-extern int handle_hmi_exception(uint64_t hmer);
+extern int handle_hmi_exception(uint64_t hmer, struct OpalHMIEvent *hmi_evt);
 
 #endif /* __ASSEMBLY__ */
 #endif /* __OPAL_H */