diff options
| author | Will Deacon <will@kernel.org> | 2021-02-12 14:57:13 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-02-12 14:57:13 +0000 |
| commit | 90eb8c9d94fa7f9969792584c376b435bf8a035c (patch) | |
| tree | 3e10c3f5580d0bb4388bc8c832ae79f25e0f8e6d /arch/arm64/kernel/syscall.c | |
| parent | f96a816fa5e5b7bdbfc1802dfb7f8155df2746d0 (diff) | |
| parent | 6459b8469753e9feaa8b34691d097cffad905931 (diff) | |
Merge branch 'for-next/errata' into for-next/core
Rework of the workaround for Cortex-A76 erratum 1463225 to fit in better
with the ongoing exception entry cleanups and changes to the detection
code for Cortex-A55 erratum 1024718 since it applies to all revisions of
the silicon.
* for-next/errata:
arm64: entry: consolidate Cortex-A76 erratum 1463225 workaround
arm64: Extend workaround for erratum 1024718 to all versions of Cortex-A55
Diffstat (limited to 'arch/arm64/kernel/syscall.c')
| -rw-r--r-- | arch/arm64/kernel/syscall.c | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index c2877c332f2d..b9cf12b271d7 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -65,35 +65,6 @@ static inline bool has_syscall_work(unsigned long flags) int syscall_trace_enter(struct pt_regs *regs); void syscall_trace_exit(struct pt_regs *regs); -#ifdef CONFIG_ARM64_ERRATUM_1463225 -DECLARE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa); - -static void cortex_a76_erratum_1463225_svc_handler(void) -{ - u32 reg, val; - - if (!unlikely(test_thread_flag(TIF_SINGLESTEP))) - return; - - if (!unlikely(this_cpu_has_cap(ARM64_WORKAROUND_1463225))) - return; - - __this_cpu_write(__in_cortex_a76_erratum_1463225_wa, 1); - reg = read_sysreg(mdscr_el1); - val = reg | DBG_MDSCR_SS | DBG_MDSCR_KDE; - write_sysreg(val, mdscr_el1); - asm volatile("msr daifclr, #8"); - isb(); - - /* We will have taken a single-step exception by this point */ - - write_sysreg(reg, mdscr_el1); - __this_cpu_write(__in_cortex_a76_erratum_1463225_wa, 0); -} -#else -static void cortex_a76_erratum_1463225_svc_handler(void) { } -#endif /* CONFIG_ARM64_ERRATUM_1463225 */ - static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr, const syscall_fn_t syscall_table[]) { @@ -120,7 +91,6 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr, * (Similarly for HVC and SMC elsewhere.) */ - cortex_a76_erratum_1463225_svc_handler(); local_daif_restore(DAIF_PROCCTX); if (flags & _TIF_MTE_ASYNC_FAULT) { |