ASoC: SOF: Intel: add telemetry retrieval support on Intel platforms

Telemetry data is decoded based on intel xtensa design and printed in
kernel log by sof debug framework.
Signed-off-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230919092416.4137-7-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/Makefile

@@ -7,7 +7,8 @@ snd-sof-intel-hda-common-objs := hda.o hda-loader.o hda-stream.o hda-trace.o \
 				 hda-dsp.o hda-ipc.o hda-ctrl.o hda-pcm.o \
 				 hda-dai.o hda-dai-ops.o hda-bus.o \
 				 skl.o hda-loader-skl.o \
-				 apl.o cnl.o tgl.o icl.o mtl.o lnl.o hda-common-ops.o
+				 apl.o cnl.o tgl.o icl.o mtl.o lnl.o hda-common-ops.o \
+				 telemetry.o
 
 snd-sof-intel-hda-mlink-objs := hda-mlink.o
 

sound/soc/sof/intel/telemetry.c

+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+//
+// This file is provided under a dual BSD/GPLv2 license.  When using or
+// redistributing this file, you may do so under either license.
+//
+// Copyright(c) 2023 Intel Corporation. All rights reserved.
+
+/* telemetry data queried from debug window */
+
+#include <sound/sof/ipc4/header.h>
+#include <sound/sof/xtensa.h>
+#include "../ipc4-priv.h"
+#include "../sof-priv.h"
+#include "hda.h"
+#include "telemetry.h"
+
+void sof_ipc4_intel_dump_telemetry_state(struct snd_sof_dev *sdev, u32 flags)
+{
+	static const char invalid_slot_msg[] = "Core dump is not available due to";
+	struct sof_ipc4_telemetry_slot_data *telemetry_data;
+	struct sof_ipc_dsp_oops_xtensa *xoops;
+	struct xtensa_arch_block *block;
+	u32 slot_offset;
+	char *level;
+
+	level = (flags & SOF_DBG_DUMP_OPTIONAL) ? KERN_DEBUG : KERN_ERR;
+
+	slot_offset = sof_ipc4_find_debug_slot_offset_by_type(sdev, SOF_IPC4_DEBUG_SLOT_TELEMETRY);
+	if (!slot_offset)
+		return;
+
+	telemetry_data = kmalloc(sizeof(*telemetry_data), GFP_KERNEL);
+	if (!telemetry_data)
+		return;
+	sof_mailbox_read(sdev, slot_offset, telemetry_data, sizeof(*telemetry_data));
+	if (telemetry_data->separator != XTENSA_CORE_DUMP_SEPARATOR) {
+		dev_err(sdev->dev, "%s invalid separator %#x\n", invalid_slot_msg,
+			telemetry_data->separator);
+		goto free_telemetry_data;
+	}
+
+	block = kmalloc(sizeof(*block), GFP_KERNEL);
+	if (!block)
+		goto free_telemetry_data;
+
+	sof_mailbox_read(sdev, slot_offset + sizeof(*telemetry_data), block, sizeof(*block));
+	if (block->soc != XTENSA_SOC_INTEL_ADSP) {
+		dev_err(sdev->dev, "%s invalid SOC %d\n", invalid_slot_msg, block->soc);
+		goto free_block;
+	}
+
+	if (telemetry_data->hdr.id[0] != COREDUMP_HDR_ID0 ||
+	    telemetry_data->hdr.id[1] != COREDUMP_HDR_ID1 ||
+	    telemetry_data->arch_hdr.id != COREDUMP_ARCH_HDR_ID) {
+		dev_err(sdev->dev, "%s invalid coredump header %c%c, arch hdr %c\n",
+			invalid_slot_msg, telemetry_data->hdr.id[0],
+			telemetry_data->hdr.id[1],
+			telemetry_data->arch_hdr.id);
+		goto free_block;
+	}
+
+	switch (block->toolchain) {
+	case XTENSA_TOOL_CHAIN_ZEPHYR:
+		dev_printk(level, sdev->dev, "FW is built with Zephyr toolchain\n");
+		break;
+	case XTENSA_TOOL_CHAIN_XCC:
+		dev_printk(level, sdev->dev, "FW is built with XCC toolchain\n");
+		break;
+	default:
+		dev_printk(level, sdev->dev, "Unknown toolchain is used\n");
+		break;
+	}
+
+	xoops = kzalloc(struct_size(xoops, ar, XTENSA_CORE_AR_REGS_COUNT), GFP_KERNEL);
+	if (!xoops)
+		goto free_block;
+
+	xoops->exccause = block->exccause;
+	xoops->excvaddr = block->excvaddr;
+	xoops->epc1 = block->pc;
+	xoops->ps = block->ps;
+	xoops->sar = block->sar;
+
+	xoops->plat_hdr.numaregs = XTENSA_CORE_AR_REGS_COUNT;
+	memcpy((void *)xoops->ar, block->ar, XTENSA_CORE_AR_REGS_COUNT * sizeof(u32));
+
+	sof_oops(sdev, level, xoops);
+	sof_stack(sdev, level, xoops, NULL, 0);
+
+	kfree(xoops);
+free_block:
+	kfree(block);
+free_telemetry_data:
+	kfree(telemetry_data);
+}

sound/soc/sof/intel/telemetry.h

+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * Copyright(c) 2023 Intel Corporation. All rights reserved.
+ *
+ * telemetry data in debug windows
+ */
+
+#ifndef _SOF_INTEL_TELEMETRY_H
+#define _SOF_INTEL_TELEMETRY_H
+
+#include "../ipc4-telemetry.h"
+
+struct xtensa_arch_block {
+	u8	soc; /* should be equal to XTENSA_SOC_INTEL_ADSP */
+	u16	version;
+	u8	toolchain; /* ZEPHYR or XCC */
+
+	u32	pc;
+	u32	exccause;
+	u32	excvaddr;
+	u32	sar;
+	u32	ps;
+	u32	scompare1;
+	u32	ar[XTENSA_CORE_AR_REGS_COUNT];
+	u32	lbeg;
+	u32	lend;
+	u32	lcount;
+} __packed;
+
+void sof_ipc4_intel_dump_telemetry_state(struct snd_sof_dev *sdev, u32 flags);
+
+#endif /* _SOF_INTEL_TELEMETRY_H */