1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2021 Sifive. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/memory.h> 8 #include <linux/module.h> 9 #include <linux/string.h> 10 #include <linux/bug.h> 11 #include <asm/text-patching.h> 12 #include <asm/alternative.h> 13 #include <asm/vendorid_list.h> 14 #include <asm/errata_list.h> 15 #include <asm/vendor_extensions.h> 16 17 struct errata_info_t { 18 char name[32]; 19 bool (*check_func)(unsigned long arch_id, unsigned long impid); 20 }; 21 22 static bool errata_cip_453_check_func(unsigned long arch_id, unsigned long impid) 23 { 24 /* 25 * Affected cores: 26 * Architecture ID: 0x8000000000000007 27 * Implement ID: 0x20181004 <= impid <= 0x20191105 28 */ 29 if (arch_id != 0x8000000000000007 || 30 (impid < 0x20181004 || impid > 0x20191105)) 31 return false; 32 return true; 33 } 34 35 static bool errata_cip_1200_check_func(unsigned long arch_id, unsigned long impid) 36 { 37 /* 38 * Affected cores: 39 * Architecture ID: 0x8000000000000007 or 0x1 40 * Implement ID: mimpid[23:0] <= 0x200630 and mimpid != 0x01200626 41 */ 42 if (arch_id != 0x8000000000000007 && arch_id != 0x1) 43 return false; 44 if ((impid & 0xffffff) > 0x200630 || impid == 0x1200626) 45 return false; 46 47 #ifdef CONFIG_MMU 48 tlb_flush_all_threshold = 0; 49 #endif 50 51 return true; 52 } 53 54 static bool errata_mal_9092_check_func(unsigned long arch_id, unsigned long impid) 55 { 56 /* 57 * Affected cores: 58 * Architecture ID: 0x8000000000000109 59 * Implementation ID: 0x19251031, 0x19251217, 0x19260320 60 */ 61 62 if (arch_id != 0x8000000000000109) 63 return false; 64 if (impid != 0x19251031 && impid != 0x19251217 && impid != 0x19260320) 65 return false; 66 67 return true; 68 } 69 70 static struct errata_info_t errata_list[ERRATA_SIFIVE_NUMBER] = { 71 { 72 .name = "cip-453", 73 .check_func = errata_cip_453_check_func 74 }, 75 { 76 .name = "cip-1200", 77 .check_func = errata_cip_1200_check_func 78 }, 79 { 80 .name = "mal-9092", 81 .check_func = errata_mal_9092_check_func 82 }, 83 }; 84 85 static u32 __init_or_module sifive_errata_probe(unsigned long archid, 86 unsigned long impid) 87 { 88 int idx; 89 u32 cpu_req_errata = 0; 90 91 for (idx = 0; idx < ERRATA_SIFIVE_NUMBER; idx++) 92 if (errata_list[idx].check_func(archid, impid)) 93 cpu_req_errata |= (1U << idx); 94 95 return cpu_req_errata; 96 } 97 98 void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, 99 unsigned long archid, unsigned long impid, 100 unsigned int stage) 101 { 102 struct alt_entry *alt; 103 u32 cpu_req_errata; 104 u32 tmp; 105 106 BUILD_BUG_ON(ERRATA_SIFIVE_NUMBER >= RISCV_VENDOR_EXT_ALTERNATIVES_BASE); 107 108 if (stage == RISCV_ALTERNATIVES_EARLY_BOOT) 109 return; 110 111 cpu_req_errata = sifive_errata_probe(archid, impid); 112 113 for (alt = begin; alt < end; alt++) { 114 if (alt->vendor_id != SIFIVE_VENDOR_ID) 115 continue; 116 if (alt->patch_id >= ERRATA_SIFIVE_NUMBER) 117 continue; 118 119 tmp = (1U << alt->patch_id); 120 if (cpu_req_errata & tmp) { 121 mutex_lock(&text_mutex); 122 patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt), 123 alt->alt_len); 124 mutex_unlock(&text_mutex); 125 } 126 } 127 } 128