1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
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			0xc2ffff00
12 #define MCE_SMC_READ_MCA			12
13 
14 #define MCA_ARI_CMD_RD_SERR			1
15 
16 #define MCA_ARI_RW_SUBIDX_STAT			1
17 #define SERR_STATUS_VAL				BIT_ULL(63)
18 
19 #define MCA_ARI_RW_SUBIDX_ADDR			2
20 #define MCA_ARI_RW_SUBIDX_MSC1			3
21 #define MCA_ARI_RW_SUBIDX_MSC2			4
22 
23 static const char * const bank_names[] = {
24 	"SYS:DPMU", "ROC:IOB", "ROC:MCB", "ROC:CCE", "ROC:CQX", "ROC:CTU",
25 };
26 
read_uncore_mca(u8 cmd,u8 idx,u8 subidx,u8 inst,u64 * data)27 static 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 
tegra186_ari_panic_handler(struct notifier_block * nb,unsigned long code,void * unused)39 static 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 
69 static struct notifier_block tegra186_ari_panic_nb = {
70 	.notifier_call = tegra186_ari_panic_handler,
71 };
72 
tegra186_ari_init(void)73 static 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 }
80 early_initcall(tegra186_ari_init);
81