NPU2 HMIs: dump out a *LOT* of npu2 registers for debugging

This is not the way we want to end up doing this.

This is a hack to make folk happy and not require crondump to
debug nvidia/npu2 issues.

Cc: stable
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 37 insertions, 1 deletions

diff --git a/core/hmi.c b/core/hmi.c
index 00d0fb7..17983a3 100644
--- a/core/hmi.c
+++ b/core/hmi.c
@@ -1,4 +1,4 @@
-/* Copyright 2013-2014 IBM Corp.
+/* Copyright 2013-2018 IBM Corp.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,6 +29,7 @@
 #include <npu2-regs.h>
 #include <npu.h>
 #include <capp.h>
+#include <nvram.h>
 
 /*
  * HMER register layout:
@@ -544,7 +545,10 @@ static void find_npu2_checkstop_reason(int flat_chip_id,
 	uint64_t npu2_fir_action0_addr;
 	uint64_t npu2_fir_action1_addr;
 	uint64_t fatal_errors;
+	uint64_t npu_scom_dump[2];
+	bool npu2_hmi_verbose;
 	int total_errors = 0;
+	uint64_t r;
 
 	/* Find the NPU on the chip associated with the HMI. */
 	for_each_phb(phb) {
@@ -596,6 +600,38 @@ static void find_npu2_checkstop_reason(int flat_chip_id,
 	if (!total_errors)
 		return;
 
+	npu2_hmi_verbose = nvram_query_eq("npu2-hmi-verbose", "true");
+	/* Force this for now until we sort out something better */
+	npu2_hmi_verbose = true;
+
+	if (npu2_hmi_verbose) {
+		_xscom_lock();
+		for (r = NPU2_DEBUG_REG_START; r < NPU2_DEBUG_REG_END; r++) {
+			npu_scom_dump[0] = npu_scom_dump[1] = 0;
+			_xscom_read(flat_chip_id, r++, &npu_scom_dump[0], false, true);
+			_xscom_read(flat_chip_id, r,   &npu_scom_dump[1], false, true);
+			prlog(PR_ERR, "NPU: 0x%016llx=0x%016llx 0x%016llx=0x%016llx\n",
+			      r-1, npu_scom_dump[0],
+			      r, npu_scom_dump[1]);
+		}
+		for (r = NPU2_FIR_REGISTER_0; r < NPU2_FIR_REGISTER_END; r++) {
+			npu_scom_dump[0] = npu_scom_dump[1] = 0;
+			_xscom_read(flat_chip_id, r++, &npu_scom_dump[0], false, true);
+			_xscom_read(flat_chip_id, r,   &npu_scom_dump[1], false, true);
+			prlog(PR_ERR, "NPU: 0x%016llx=0x%016llx 0x%016llx=0x%016llx\n",
+			      r-1, npu_scom_dump[0],
+			      r, npu_scom_dump[1]);
+		}
+		_xscom_unlock();
+		prlog(PR_ERR, " _________________________ \n");
+		prlog(PR_ERR, "< It's Driver Debug time! >\n");
+		prlog(PR_ERR, " ------------------------- \n");
+		prlog(PR_ERR, "       \\   ,__,            \n");
+		prlog(PR_ERR, "        \\  (oo)____        \n");
+		prlog(PR_ERR, "           (__)    )\\      \n");
+		prlog(PR_ERR, "              ||--|| *     \n");
+	}
+
 	/* Set up the HMI event */
 	hmi_evt->severity = OpalHMI_SEV_WARNING;
 	hmi_evt->type = OpalHMI_ERROR_MALFUNC_ALERT;