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1 /*
2  * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 /* Runtime firmware routines to report errata status for the current CPU. */
8 
9 #include <assert.h>
10 #include <stdbool.h>
11 
12 #include <arch_helpers.h>
13 #include <common/debug.h>
14 #include <lib/cpus/errata_report.h>
15 #include <lib/el3_runtime/cpu_data.h>
16 #include <lib/spinlock.h>
17 
18 #ifdef IMAGE_BL1
19 # define BL_STRING	"BL1"
20 #elif defined(__aarch64__) && defined(IMAGE_BL31)
21 # define BL_STRING	"BL31"
22 #elif !defined(__arch64__) && defined(IMAGE_BL32)
23 # define BL_STRING	"BL32"
24 #elif defined(IMAGE_BL2) && BL2_AT_EL3
25 # define BL_STRING "BL2"
26 #else
27 # error This image should not be printing errata status
28 #endif
29 
30 /* Errata format: BL stage, CPU, errata ID, message */
31 #define ERRATA_FORMAT	"%s: %s: CPU workaround for %s was %s\n"
32 
33 /*
34  * Returns whether errata needs to be reported. Passed arguments are private to
35  * a CPU type.
36  */
errata_needs_reporting(spinlock_t * lock,uint32_t * reported)37 int errata_needs_reporting(spinlock_t *lock, uint32_t *reported)
38 {
39 	bool report_now;
40 
41 	/* If already reported, return false. */
42 	if (*reported != 0U)
43 		return 0;
44 
45 	/*
46 	 * Acquire lock. Determine whether status needs reporting, and then mark
47 	 * report status to true.
48 	 */
49 	spin_lock(lock);
50 	report_now = (*reported == 0U);
51 	if (report_now)
52 		*reported = 1;
53 	spin_unlock(lock);
54 
55 	return report_now;
56 }
57 
58 /*
59  * Print errata status message.
60  *
61  * Unknown: WARN
62  * Missing: WARN
63  * Applied: INFO
64  * Not applied: VERBOSE
65  */
errata_print_msg(unsigned int status,const char * cpu,const char * id)66 void errata_print_msg(unsigned int status, const char *cpu, const char *id)
67 {
68 	/* Errata status strings */
69 	static const char *const errata_status_str[] = {
70 		[ERRATA_NOT_APPLIES] = "not applied",
71 		[ERRATA_APPLIES] = "applied",
72 		[ERRATA_MISSING] = "missing!"
73 	};
74 	static const char *const __unused bl_str = BL_STRING;
75 	const char *msg __unused;
76 
77 
78 	assert(status < ARRAY_SIZE(errata_status_str));
79 	assert(cpu != NULL);
80 	assert(id != NULL);
81 
82 	msg = errata_status_str[status];
83 
84 	switch (status) {
85 	case ERRATA_NOT_APPLIES:
86 		VERBOSE(ERRATA_FORMAT, bl_str, cpu, id, msg);
87 		break;
88 
89 	case ERRATA_APPLIES:
90 		INFO(ERRATA_FORMAT, bl_str, cpu, id, msg);
91 		break;
92 
93 	case ERRATA_MISSING:
94 		WARN(ERRATA_FORMAT, bl_str, cpu, id, msg);
95 		break;
96 
97 	default:
98 		WARN(ERRATA_FORMAT, bl_str, cpu, id, "unknown");
99 		break;
100 	}
101 }
102