arch/arm64/kernel/cpu_errata.c

   1 /*
   2  * Contains CPU specific errata definitions
   3  *
   4  * Copyright (C) 2014 ARM Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/types.h>
  20 #include <asm/cpu.h>
  21 #include <asm/cputype.h>
  22 #include <asm/cpufeature.h>
  23
  24 static bool __maybe_unused
  25 is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope)
  26 {
  27         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
  28         return MIDR_IS_CPU_MODEL_RANGE(read_cpuid_id(), entry->midr_model,
  29                                        entry->midr_range_min,
  30                                        entry->midr_range_max);
  31 }
  32
  33 static bool
  34 has_mismatched_cache_line_size(const struct arm64_cpu_capabilities *entry,
  35                                 int scope)
  36 {
  37         WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
  38         return (read_cpuid_cachetype() & arm64_ftr_reg_ctrel0.strict_mask) !=
  39                 (arm64_ftr_reg_ctrel0.sys_val & arm64_ftr_reg_ctrel0.strict_mask);
  40 }
  41
  42 static int cpu_enable_trap_ctr_access(void *__unused)
  43 {
  44         /* Clear SCTLR_EL1.UCT */
  45         config_sctlr_el1(SCTLR_EL1_UCT, 0);
  46         return 0;
  47 }
  48
  49 #define MIDR_RANGE(model, min, max) \
  50         .def_scope = SCOPE_LOCAL_CPU, \
  51         .matches = is_affected_midr_range, \
  52         .midr_model = model, \
  53         .midr_range_min = min, \
  54         .midr_range_max = max
  55
  56 const struct arm64_cpu_capabilities arm64_errata[] = {
  57 #if     defined(CONFIG_ARM64_ERRATUM_826319) || \
  58         defined(CONFIG_ARM64_ERRATUM_827319) || \
  59         defined(CONFIG_ARM64_ERRATUM_824069)
  60         {
  61         /* Cortex-A53 r0p[012] */
  62                 .desc = "ARM errata 826319, 827319, 824069",
  63                 .capability = ARM64_WORKAROUND_CLEAN_CACHE,
  64                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x02),
  65                 .enable = cpu_enable_cache_maint_trap,
  66         },
  67 #endif
  68 #ifdef CONFIG_ARM64_ERRATUM_819472
  69         {
  70         /* Cortex-A53 r0p[01] */
  71                 .desc = "ARM errata 819472",
  72                 .capability = ARM64_WORKAROUND_CLEAN_CACHE,
  73                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x01),
  74                 .enable = cpu_enable_cache_maint_trap,
  75         },
  76 #endif
  77 #ifdef CONFIG_ARM64_ERRATUM_832075
  78         {
  79         /* Cortex-A57 r0p0 - r1p2 */
  80                 .desc = "ARM erratum 832075",
  81                 .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
  82                 MIDR_RANGE(MIDR_CORTEX_A57, 0x00,
  83                            (1 << MIDR_VARIANT_SHIFT) | 2),
  84         },
  85 #endif
  86 #ifdef CONFIG_ARM64_ERRATUM_834220
  87         {
  88         /* Cortex-A57 r0p0 - r1p2 */
  89                 .desc = "ARM erratum 834220",
  90                 .capability = ARM64_WORKAROUND_834220,
  91                 MIDR_RANGE(MIDR_CORTEX_A57, 0x00,
  92                            (1 << MIDR_VARIANT_SHIFT) | 2),
  93         },
  94 #endif
  95 #ifdef CONFIG_ARM64_ERRATUM_845719
  96         {
  97         /* Cortex-A53 r0p[01234] */
  98                 .desc = "ARM erratum 845719",
  99                 .capability = ARM64_WORKAROUND_845719,
 100                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x04),
 101         },
 102 #endif
 103 #ifdef CONFIG_CAVIUM_ERRATUM_23154
 104         {
 105         /* Cavium ThunderX, pass 1.x */
 106                 .desc = "Cavium erratum 23154",
 107                 .capability = ARM64_WORKAROUND_CAVIUM_23154,
 108                 MIDR_RANGE(MIDR_THUNDERX, 0x00, 0x01),
 109         },
 110 #endif
 111 #ifdef CONFIG_CAVIUM_ERRATUM_27456
 112         {
 113         /* Cavium ThunderX, T88 pass 1.x - 2.1 */
 114                 .desc = "Cavium erratum 27456",
 115                 .capability = ARM64_WORKAROUND_CAVIUM_27456,
 116                 MIDR_RANGE(MIDR_THUNDERX, 0x00,
 117                            (1 << MIDR_VARIANT_SHIFT) | 1),
 118         },
 119         {
 120         /* Cavium ThunderX, T81 pass 1.0 */
 121                 .desc = "Cavium erratum 27456",
 122                 .capability = ARM64_WORKAROUND_CAVIUM_27456,
 123                 MIDR_RANGE(MIDR_THUNDERX_81XX, 0x00, 0x00),
 124         },
 125 #endif
 126         {
 127                 .desc = "Mismatched cache line size",
 128                 .capability = ARM64_MISMATCHED_CACHE_LINE_SIZE,
 129                 .matches = has_mismatched_cache_line_size,
 130                 .def_scope = SCOPE_LOCAL_CPU,
 131                 .enable = cpu_enable_trap_ctr_access,
 132         },
 133         {
 134         }
 135 };
 136
 137 /*
 138  * The CPU Errata work arounds are detected and applied at boot time
 139  * and the related information is freed soon after. If the new CPU requires
 140  * an errata not detected at boot, fail this CPU.
 141  */
 142 void verify_local_cpu_errata_workarounds(void)
 143 {
 144         const struct arm64_cpu_capabilities *caps = arm64_errata;
 145
 146         for (; caps->matches; caps++)
 147                 if (!cpus_have_cap(caps->capability) &&
 148                         caps->matches(caps, SCOPE_LOCAL_CPU)) {
 149                         pr_crit("CPU%d: Requires work around for %s, not detected"
 150                                         " at boot time\n",
 151                                 smp_processor_id(),
 152                                 caps->desc ? : "an erratum");
 153                         cpu_die_early();
 154                 }
 155 }
 156
 157 void update_cpu_errata_workarounds(void)
 158 {
 159         update_cpu_capabilities(arm64_errata, "enabling workaround for");
 160 }
 161
 162 void __init enable_errata_workarounds(void)
 163 {
 164         enable_cpu_capabilities(arm64_errata);
 165 }