blob: 1d2b6d768efed0dfec298b8b275e5bcb853517ee [file] [log] [blame]
/*
* Contains CPU specific errata definitions
*
* Copyright (C) 2014 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/arm-smccc.h>
#include <linux/psci.h>
#include <linux/types.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/cpufeature.h>
static bool __maybe_unused
is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope)
{
const struct arm64_midr_revidr *fix;
u32 midr = read_cpuid_id(), revidr;
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
if (!is_midr_in_range(midr, &entry->midr_range))
return false;
midr &= MIDR_REVISION_MASK | MIDR_VARIANT_MASK;
revidr = read_cpuid(REVIDR_EL1);
for (fix = entry->fixed_revs; fix && fix->revidr_mask; fix++)
if (midr == fix->midr_rv && (revidr & fix->revidr_mask))
return false;
return true;
}
static bool __maybe_unused
is_affected_midr_range_list(const struct arm64_cpu_capabilities *entry,
int scope)
{
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
return is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list);
}
static bool __maybe_unused
is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope)
{
u32 model;
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
model = read_cpuid_id();
model &= MIDR_IMPLEMENTOR_MASK | (0xf00 << MIDR_PARTNUM_SHIFT) |
MIDR_ARCHITECTURE_MASK;
return model == entry->midr_range.model;
}
static bool
has_mismatched_cache_line_size(const struct arm64_cpu_capabilities *entry,
int scope)
{
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
return (read_cpuid_cachetype() & arm64_ftr_reg_ctrel0.strict_mask) !=
(arm64_ftr_reg_ctrel0.sys_val & arm64_ftr_reg_ctrel0.strict_mask);
}
static void
cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *__unused)
{
/* Clear SCTLR_EL1.UCT */
config_sctlr_el1(SCTLR_EL1_UCT, 0);
}
atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1);
#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
#ifdef CONFIG_KVM_INDIRECT_VECTORS
extern char __smccc_workaround_1_smc_start[];
extern char __smccc_workaround_1_smc_end[];
static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
const char *hyp_vecs_end)
{
void *dst = lm_alias(__bp_harden_hyp_vecs_start + slot * SZ_2K);
int i;
for (i = 0; i < SZ_2K; i += 0x80)
memcpy(dst + i, hyp_vecs_start, hyp_vecs_end - hyp_vecs_start);
flush_icache_range((uintptr_t)dst, (uintptr_t)dst + SZ_2K);
}
static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
const char *hyp_vecs_start,
const char *hyp_vecs_end)
{
static DEFINE_SPINLOCK(bp_lock);
int cpu, slot = -1;
spin_lock(&bp_lock);
for_each_possible_cpu(cpu) {
if (per_cpu(bp_hardening_data.fn, cpu) == fn) {
slot = per_cpu(bp_hardening_data.hyp_vectors_slot, cpu);
break;
}
}
if (slot == -1) {
slot = atomic_inc_return(&arm64_el2_vector_last_slot);
BUG_ON(slot >= BP_HARDEN_EL2_SLOTS);
__copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end);
}
__this_cpu_write(bp_hardening_data.hyp_vectors_slot, slot);
__this_cpu_write(bp_hardening_data.fn, fn);
spin_unlock(&bp_lock);
}
#else
#define __smccc_workaround_1_smc_start NULL
#define __smccc_workaround_1_smc_end NULL
static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
const char *hyp_vecs_start,
const char *hyp_vecs_end)
{
__this_cpu_write(bp_hardening_data.fn, fn);
}
#endif /* CONFIG_KVM_INDIRECT_VECTORS */
static void install_bp_hardening_cb(const struct arm64_cpu_capabilities *entry,
bp_hardening_cb_t fn,
const char *hyp_vecs_start,
const char *hyp_vecs_end)
{
u64 pfr0;
if (!entry->matches(entry, SCOPE_LOCAL_CPU))
return;
pfr0 = read_cpuid(ID_AA64PFR0_EL1);
if (cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_CSV2_SHIFT))
return;
__install_bp_hardening_cb(fn, hyp_vecs_start, hyp_vecs_end);
}
#include <uapi/linux/psci.h>
#include <linux/arm-smccc.h>
#include <linux/psci.h>
static void call_smc_arch_workaround_1(void)
{
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
}
static void call_hvc_arch_workaround_1(void)
{
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
}
static void qcom_link_stack_sanitization(void)
{
u64 tmp;
asm volatile("mov %0, x30 \n"
".rept 16 \n"
"bl . + 4 \n"
".endr \n"
"mov x30, %0 \n"
: "=&r" (tmp));
}
static void
enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry)
{
bp_hardening_cb_t cb;
void *smccc_start, *smccc_end;
struct arm_smccc_res res;
u32 midr = read_cpuid_id();
if (!entry->matches(entry, SCOPE_LOCAL_CPU))
return;
if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
return;
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
if ((int)res.a0 < 0)
return;
cb = call_hvc_arch_workaround_1;
/* This is a guest, no need to patch KVM vectors */
smccc_start = NULL;
smccc_end = NULL;
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
if ((int)res.a0 < 0)
return;
cb = call_smc_arch_workaround_1;
smccc_start = __smccc_workaround_1_smc_start;
smccc_end = __smccc_workaround_1_smc_end;
break;
default:
return;
}
if (((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR) ||
((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1))
cb = qcom_link_stack_sanitization;
install_bp_hardening_cb(entry, cb, smccc_start, smccc_end);
return;
}
#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
#ifdef CONFIG_ARM64_SSBD
DEFINE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);
int ssbd_state __read_mostly = ARM64_SSBD_KERNEL;
static const struct ssbd_options {
const char *str;
int state;
} ssbd_options[] = {
{ "force-on", ARM64_SSBD_FORCE_ENABLE, },
{ "force-off", ARM64_SSBD_FORCE_DISABLE, },
{ "kernel", ARM64_SSBD_KERNEL, },
};
static int __init ssbd_cfg(char *buf)
{
int i;
if (!buf || !buf[0])
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(ssbd_options); i++) {
int len = strlen(ssbd_options[i].str);
if (strncmp(buf, ssbd_options[i].str, len))
continue;
ssbd_state = ssbd_options[i].state;
return 0;
}
return -EINVAL;
}
early_param("ssbd", ssbd_cfg);
void __init arm64_update_smccc_conduit(struct alt_instr *alt,
__le32 *origptr, __le32 *updptr,
int nr_inst)
{
u32 insn;
BUG_ON(nr_inst != 1);
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
insn = aarch64_insn_get_hvc_value();
break;
case PSCI_CONDUIT_SMC:
insn = aarch64_insn_get_smc_value();
break;
default:
return;
}
*updptr = cpu_to_le32(insn);
}
void __init arm64_enable_wa2_handling(struct alt_instr *alt,
__le32 *origptr, __le32 *updptr,
int nr_inst)
{
BUG_ON(nr_inst != 1);
/*
* Only allow mitigation on EL1 entry/exit and guest
* ARCH_WORKAROUND_2 handling if the SSBD state allows it to
* be flipped.
*/
if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL)
*updptr = cpu_to_le32(aarch64_insn_gen_nop());
}
void arm64_set_ssbd_mitigation(bool state)
{
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
break;
default:
WARN_ON_ONCE(1);
break;
}
}
static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
int scope)
{
struct arm_smccc_res res;
bool required = true;
s32 val;
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
if (psci_ops.smccc_version == SMCCC_VERSION_1_0) {
ssbd_state = ARM64_SSBD_UNKNOWN;
return false;
}
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_2, &res);
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_2, &res);
break;
default:
ssbd_state = ARM64_SSBD_UNKNOWN;
return false;
}
val = (s32)res.a0;
switch (val) {
case SMCCC_RET_NOT_SUPPORTED:
ssbd_state = ARM64_SSBD_UNKNOWN;
return false;
case SMCCC_RET_NOT_REQUIRED:
pr_info_once("%s mitigation not required\n", entry->desc);
ssbd_state = ARM64_SSBD_MITIGATED;
return false;
case SMCCC_RET_SUCCESS:
required = true;
break;
case 1: /* Mitigation not required on this CPU */
required = false;
break;
default:
WARN_ON(1);
return false;
}
switch (ssbd_state) {
case ARM64_SSBD_FORCE_DISABLE:
pr_info_once("%s disabled from command-line\n", entry->desc);
arm64_set_ssbd_mitigation(false);
required = false;
break;
case ARM64_SSBD_KERNEL:
if (required) {
__this_cpu_write(arm64_ssbd_callback_required, 1);
arm64_set_ssbd_mitigation(true);
}
break;
case ARM64_SSBD_FORCE_ENABLE:
pr_info_once("%s forced from command-line\n", entry->desc);
arm64_set_ssbd_mitigation(true);
required = true;
break;
default:
WARN_ON(1);
break;
}
return required;
}
#endif /* CONFIG_ARM64_SSBD */
#define CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \
.matches = is_affected_midr_range, \
.midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max)
#define CAP_MIDR_ALL_VERSIONS(model) \
.matches = is_affected_midr_range, \
.midr_range = MIDR_ALL_VERSIONS(model)
#define MIDR_FIXED(rev, revidr_mask) \
.fixed_revs = (struct arm64_midr_revidr[]){{ (rev), (revidr_mask) }, {}}
#define ERRATA_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \
CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max)
#define CAP_MIDR_RANGE_LIST(list) \
.matches = is_affected_midr_range_list, \
.midr_range_list = list
/* Errata affecting a range of revisions of given model variant */
#define ERRATA_MIDR_REV_RANGE(m, var, r_min, r_max) \
ERRATA_MIDR_RANGE(m, var, r_min, var, r_max)
/* Errata affecting a single variant/revision of a model */
#define ERRATA_MIDR_REV(model, var, rev) \
ERRATA_MIDR_RANGE(model, var, rev, var, rev)
/* Errata affecting all variants/revisions of a given a model */
#define ERRATA_MIDR_ALL_VERSIONS(model) \
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \
CAP_MIDR_ALL_VERSIONS(model)
/* Errata affecting a list of midr ranges, with same work around */
#define ERRATA_MIDR_RANGE_LIST(midr_list) \
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \
CAP_MIDR_RANGE_LIST(midr_list)
/*
* Generic helper for handling capabilties with multiple (match,enable) pairs
* of call backs, sharing the same capability bit.
* Iterate over each entry to see if at least one matches.
*/
static bool __maybe_unused
multi_entry_cap_matches(const struct arm64_cpu_capabilities *entry, int scope)
{
const struct arm64_cpu_capabilities *caps;
for (caps = entry->match_list; caps->matches; caps++)
if (caps->matches(caps, scope))
return true;
return false;
}
/*
* Take appropriate action for all matching entries in the shared capability
* entry.
*/
static void __maybe_unused
multi_entry_cap_cpu_enable(const struct arm64_cpu_capabilities *entry)
{
const struct arm64_cpu_capabilities *caps;
for (caps = entry->match_list; caps->matches; caps++)
if (caps->matches(caps, SCOPE_LOCAL_CPU) &&
caps->cpu_enable)
caps->cpu_enable(caps);
}
#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
/*
* List of CPUs where we need to issue a psci call to
* harden the branch predictor.
*/
static const struct midr_range arm64_bp_harden_smccc_cpus[] = {
MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
MIDR_ALL_VERSIONS(MIDR_CORTEX_A75),
MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR_V1),
MIDR_ALL_VERSIONS(MIDR_QCOM_FALKOR),
MIDR_ALL_VERSIONS(MIDR_NVIDIA_DENVER),
{},
};
#endif
#ifdef CONFIG_HARDEN_EL2_VECTORS
static const struct midr_range arm64_harden_el2_vectors[] = {
MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
{},
};
#endif
const struct arm64_cpu_capabilities arm64_errata[] = {
#if defined(CONFIG_ARM64_ERRATUM_826319) || \
defined(CONFIG_ARM64_ERRATUM_827319) || \
defined(CONFIG_ARM64_ERRATUM_824069)
{
/* Cortex-A53 r0p[012] */
.desc = "ARM errata 826319, 827319, 824069",
.capability = ARM64_WORKAROUND_CLEAN_CACHE,
ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 2),
.cpu_enable = cpu_enable_cache_maint_trap,
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_819472
{
/* Cortex-A53 r0p[01] */
.desc = "ARM errata 819472",
.capability = ARM64_WORKAROUND_CLEAN_CACHE,
ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 1),
.cpu_enable = cpu_enable_cache_maint_trap,
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_832075
{
/* Cortex-A57 r0p0 - r1p2 */
.desc = "ARM erratum 832075",
.capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
ERRATA_MIDR_RANGE(MIDR_CORTEX_A57,
0, 0,
1, 2),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_834220
{
/* Cortex-A57 r0p0 - r1p2 */
.desc = "ARM erratum 834220",
.capability = ARM64_WORKAROUND_834220,
ERRATA_MIDR_RANGE(MIDR_CORTEX_A57,
0, 0,
1, 2),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_843419
{
/* Cortex-A53 r0p[01234] */
.desc = "ARM erratum 843419",
.capability = ARM64_WORKAROUND_843419,
ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
MIDR_FIXED(0x4, BIT(8)),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_845719
{
/* Cortex-A53 r0p[01234] */
.desc = "ARM erratum 845719",
.capability = ARM64_WORKAROUND_845719,
ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
},
#endif
#ifdef CONFIG_CAVIUM_ERRATUM_23154
{
/* Cavium ThunderX, pass 1.x */
.desc = "Cavium erratum 23154",
.capability = ARM64_WORKAROUND_CAVIUM_23154,
ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX, 0, 0, 1),
},
#endif
#ifdef CONFIG_CAVIUM_ERRATUM_27456
{
/* Cavium ThunderX, T88 pass 1.x - 2.1 */
.desc = "Cavium erratum 27456",
.capability = ARM64_WORKAROUND_CAVIUM_27456,
ERRATA_MIDR_RANGE(MIDR_THUNDERX,
0, 0,
1, 1),
},
{
/* Cavium ThunderX, T81 pass 1.0 */
.desc = "Cavium erratum 27456",
.capability = ARM64_WORKAROUND_CAVIUM_27456,
ERRATA_MIDR_REV(MIDR_THUNDERX_81XX, 0, 0),
},
#endif
#ifdef CONFIG_CAVIUM_ERRATUM_30115
{
/* Cavium ThunderX, T88 pass 1.x - 2.2 */
.desc = "Cavium erratum 30115",
.capability = ARM64_WORKAROUND_CAVIUM_30115,
ERRATA_MIDR_RANGE(MIDR_THUNDERX,
0, 0,
1, 2),
},
{
/* Cavium ThunderX, T81 pass 1.0 - 1.2 */
.desc = "Cavium erratum 30115",
.capability = ARM64_WORKAROUND_CAVIUM_30115,
ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX_81XX, 0, 0, 2),
},
{
/* Cavium ThunderX, T83 pass 1.0 */
.desc = "Cavium erratum 30115",
.capability = ARM64_WORKAROUND_CAVIUM_30115,
ERRATA_MIDR_REV(MIDR_THUNDERX_83XX, 0, 0),
},
#endif
{
.desc = "Mismatched cache line size",
.capability = ARM64_MISMATCHED_CACHE_LINE_SIZE,
.matches = has_mismatched_cache_line_size,
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
.cpu_enable = cpu_enable_trap_ctr_access,
},
#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
{
.desc = "Qualcomm Technologies Falkor erratum 1003",
.capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0),
},
{
.desc = "Qualcomm Technologies Kryo erratum 1003",
.capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
.midr_range.model = MIDR_QCOM_KRYO,
.matches = is_kryo_midr,
},
#endif
#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1009
{
.desc = "Qualcomm Technologies Falkor erratum 1009",
.capability = ARM64_WORKAROUND_REPEAT_TLBI,
ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_858921
{
/* Cortex-A73 all versions */
.desc = "ARM erratum 858921",
.capability = ARM64_WORKAROUND_858921,
ERRATA_MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
},
#endif
#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
.cpu_enable = enable_smccc_arch_workaround_1,
ERRATA_MIDR_RANGE_LIST(arm64_bp_harden_smccc_cpus),
},
#endif
#ifdef CONFIG_HARDEN_EL2_VECTORS
{
.desc = "EL2 vector hardening",
.capability = ARM64_HARDEN_EL2_VECTORS,
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
ERRATA_MIDR_RANGE_LIST(arm64_harden_el2_vectors),
},
#endif
#ifdef CONFIG_ARM64_SSBD
{
.desc = "Speculative Store Bypass Disable",
.capability = ARM64_SSBD,
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
.matches = has_ssbd_mitigation,
},
#endif
{
}
};