1 /* 2 * Copyright (c) 2017-2018, 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 <arch_helpers.h> 10 #include <assert.h> 11 #include <cpu_data.h> 12 #include <debug.h> 13 #include <errata_report.h> 14 #include <spinlock.h> 15 #include <utils.h> 16 17 #ifdef IMAGE_BL1 18 # define BL_STRING "BL1" 19 #elif defined(AARCH64) && defined(IMAGE_BL31) 20 # define BL_STRING "BL31" 21 #elif defined(AARCH32) && defined(IMAGE_BL32) 22 # define BL_STRING "BL32" 23 #elif defined(IMAGE_BL2) && BL2_AT_EL3 24 # define BL_STRING "BL2" 25 #else 26 # error This image should not be printing errata status 27 #endif 28 29 /* Errata format: BL stage, CPU, errata ID, message */ 30 #define ERRATA_FORMAT "%s: %s: CPU workaround for %s was %s\n" 31 32 /* 33 * Returns whether errata needs to be reported. Passed arguments are private to 34 * a CPU type. 35 */ 36 int errata_needs_reporting(spinlock_t *lock, uint32_t *reported) 37 { 38 int report_now; 39 40 /* If already reported, return false. */ 41 if (*reported) 42 return 0; 43 44 /* 45 * Acquire lock. Determine whether status needs reporting, and then mark 46 * report status to true. 47 */ 48 spin_lock(lock); 49 report_now = !(*reported); 50 if (report_now) 51 *reported = 1; 52 spin_unlock(lock); 53 54 return report_now; 55 } 56 57 /* 58 * Print errata status message. 59 * 60 * Unknown: WARN 61 * Missing: WARN 62 * Applied: INFO 63 * Not applied: VERBOSE 64 */ 65 void errata_print_msg(unsigned int status, const char *cpu, const char *id) 66 { 67 /* Errata status strings */ 68 static const char *const errata_status_str[] = { 69 [ERRATA_NOT_APPLIES] = "not applied", 70 [ERRATA_APPLIES] = "applied", 71 [ERRATA_MISSING] = "missing!" 72 }; 73 static const char *const __unused bl_str = BL_STRING; 74 const char *msg __unused; 75 76 77 assert(status < ARRAY_SIZE(errata_status_str)); 78 assert(cpu); 79 assert(id); 80 81 msg = errata_status_str[status]; 82 83 switch (status) { 84 case ERRATA_NOT_APPLIES: 85 VERBOSE(ERRATA_FORMAT, bl_str, cpu, id, msg); 86 break; 87 88 case ERRATA_APPLIES: 89 INFO(ERRATA_FORMAT, bl_str, cpu, id, msg); 90 break; 91 92 case ERRATA_MISSING: 93 WARN(ERRATA_FORMAT, bl_str, cpu, id, msg); 94 break; 95 96 default: 97 WARN(ERRATA_FORMAT, bl_str, cpu, id, "unknown"); 98 break; 99 } 100 } 101