diff options
Diffstat (limited to 'arch/arm64/include/asm/arch_timer.h')
| -rw-r--r-- | arch/arm64/include/asm/arch_timer.h | 43 |
1 files changed, 32 insertions, 11 deletions
diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h index b4b34004a21e..74d08e44a651 100644 --- a/arch/arm64/include/asm/arch_timer.h +++ b/arch/arm64/include/asm/arch_timer.h @@ -25,6 +25,7 @@ #include <linux/bug.h> #include <linux/init.h> #include <linux/jump_label.h> +#include <linux/smp.h> #include <linux/types.h> #include <clocksource/arm_arch_timer.h> @@ -37,24 +38,44 @@ extern struct static_key_false arch_timer_read_ool_enabled; #define needs_unstable_timer_counter_workaround() false #endif +enum arch_timer_erratum_match_type { + ate_match_dt, + ate_match_local_cap_id, + ate_match_acpi_oem_info, +}; + +struct clock_event_device; struct arch_timer_erratum_workaround { - const char *id; /* Indicate the Erratum ID */ + enum arch_timer_erratum_match_type match_type; + const void *id; + const char *desc; u32 (*read_cntp_tval_el0)(void); u32 (*read_cntv_tval_el0)(void); u64 (*read_cntvct_el0)(void); + int (*set_next_event_phys)(unsigned long, struct clock_event_device *); + int (*set_next_event_virt)(unsigned long, struct clock_event_device *); }; -extern const struct arch_timer_erratum_workaround *timer_unstable_counter_workaround; - -#define arch_timer_reg_read_stable(reg) \ -({ \ - u64 _val; \ - if (needs_unstable_timer_counter_workaround()) \ - _val = timer_unstable_counter_workaround->read_##reg();\ - else \ - _val = read_sysreg(reg); \ - _val; \ +DECLARE_PER_CPU(const struct arch_timer_erratum_workaround *, + timer_unstable_counter_workaround); + +#define arch_timer_reg_read_stable(reg) \ +({ \ + u64 _val; \ + if (needs_unstable_timer_counter_workaround()) { \ + const struct arch_timer_erratum_workaround *wa; \ + preempt_disable(); \ + wa = __this_cpu_read(timer_unstable_counter_workaround); \ + if (wa && wa->read_##reg) \ + _val = wa->read_##reg(); \ + else \ + _val = read_sysreg(reg); \ + preempt_enable(); \ + } else { \ + _val = read_sysreg(reg); \ + } \ + _val; \ }) /* |