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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.4 */5 6#include <linux/arm-smccc.h>7#include <linux/kernel.h>8#include <linux/of.h>9#include <linux/panic_notifier.h>10 11#define SMC_SIP_INVOKE_MCE			0xc2ffff0012#define MCE_SMC_READ_MCA			1213 14#define MCA_ARI_CMD_RD_SERR			115 16#define MCA_ARI_RW_SUBIDX_STAT			117#define SERR_STATUS_VAL				BIT_ULL(63)18 19#define MCA_ARI_RW_SUBIDX_ADDR			220#define MCA_ARI_RW_SUBIDX_MSC1			321#define MCA_ARI_RW_SUBIDX_MSC2			422 23static const char * const bank_names[] = {24	"SYS:DPMU", "ROC:IOB", "ROC:MCB", "ROC:CCE", "ROC:CQX", "ROC:CTU",25};26 27static void read_uncore_mca(u8 cmd, u8 idx, u8 subidx, u8 inst, u64 *data)28{29	struct arm_smccc_res res;30 31	arm_smccc_smc(SMC_SIP_INVOKE_MCE | MCE_SMC_READ_MCA,32		      ((u64)inst << 24) | ((u64)idx << 16) |33			      ((u64)subidx << 8) | ((u64)cmd << 0),34		      0, 0, 0, 0, 0, 0, &res);35 36	*data = res.a2;37}38 39static int tegra186_ari_panic_handler(struct notifier_block *nb,40				      unsigned long code, void *unused)41{42	u64 status;43	int i;44 45	for (i = 0; i < ARRAY_SIZE(bank_names); i++) {46		read_uncore_mca(MCA_ARI_CMD_RD_SERR, i, MCA_ARI_RW_SUBIDX_STAT,47				0, &status);48 49		if (status & SERR_STATUS_VAL) {50			u64 addr, misc1, misc2;51 52			read_uncore_mca(MCA_ARI_CMD_RD_SERR, i,53					MCA_ARI_RW_SUBIDX_ADDR, 0, &addr);54			read_uncore_mca(MCA_ARI_CMD_RD_SERR, i,55					MCA_ARI_RW_SUBIDX_MSC1, 0, &misc1);56			read_uncore_mca(MCA_ARI_CMD_RD_SERR, i,57					MCA_ARI_RW_SUBIDX_MSC2, 0, &misc2);58 59			pr_crit("Machine Check Error in %s\n"60				"  status=0x%llx addr=0x%llx\n"61				"  msc1=0x%llx msc2=0x%llx\n",62				bank_names[i], status, addr, misc1, misc2);63		}64	}65 66	return NOTIFY_DONE;67}68 69static struct notifier_block tegra186_ari_panic_nb = {70	.notifier_call = tegra186_ari_panic_handler,71};72 73static int __init tegra186_ari_init(void)74{75	if (of_machine_is_compatible("nvidia,tegra186"))76		atomic_notifier_chain_register(&panic_notifier_list, &tegra186_ari_panic_nb);77 78	return 0;79}80early_initcall(tegra186_ari_init);81