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| author | Anup Patel <anup@brainfault.org> | 2018-12-04 15:59:52 +0530 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2018-12-18 22:22:23 +0100 |
| commit | 92e0d143fdef1faa7560c93fb0d6cd6c61da88ee (patch) | |
| tree | f52b5e219877dbd0b2e646c63a1c8bbb63dde25f /drivers/clocksource | |
| parent | 4f352d1fc5a8d3220e29766a26172eff34867014 (diff) | |
| download | linux-stable-92e0d143fdef1faa7560c93fb0d6cd6c61da88ee.tar.gz linux-stable-92e0d143fdef1faa7560c93fb0d6cd6c61da88ee.tar.bz2 linux-stable-92e0d143fdef1faa7560c93fb0d6cd6c61da88ee.zip | |
clocksource/drivers/riscv_timer: Provide the sched_clock
Currently, we don't have a sched_clock registered for RISC-V systems.
This means Linux time keeping will use jiffies (running at HZ) as the
default sched_clock.
To avoid this, we explicity provide sched_clock using RISC-V rdtime
instruction (similar to riscv_timer clocksource).
Signed-off-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/clocksource/riscv_timer.c | 9 |
2 files changed, 10 insertions, 1 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index c57b156f49a2..a4ae339e0101 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -599,7 +599,7 @@ config ATCPIT100_TIMER config RISCV_TIMER bool "Timer for the RISC-V platform" - depends on RISCV + depends on GENERIC_SCHED_CLOCK && RISCV default y select TIMER_PROBE select TIMER_OF diff --git a/drivers/clocksource/riscv_timer.c b/drivers/clocksource/riscv_timer.c index 084e97dc10ed..431892200a08 100644 --- a/drivers/clocksource/riscv_timer.c +++ b/drivers/clocksource/riscv_timer.c @@ -8,6 +8,7 @@ #include <linux/cpu.h> #include <linux/delay.h> #include <linux/irq.h> +#include <linux/sched_clock.h> #include <asm/smp.h> #include <asm/sbi.h> @@ -49,6 +50,11 @@ static unsigned long long riscv_clocksource_rdtime(struct clocksource *cs) return get_cycles64(); } +static u64 riscv_sched_clock(void) +{ + return get_cycles64(); +} + static DEFINE_PER_CPU(struct clocksource, riscv_clocksource) = { .name = "riscv_clocksource", .rating = 300, @@ -97,6 +103,9 @@ static int __init riscv_timer_init_dt(struct device_node *n) cs = per_cpu_ptr(&riscv_clocksource, cpuid); clocksource_register_hz(cs, riscv_timebase); + sched_clock_register(riscv_sched_clock, + BITS_PER_LONG, riscv_timebase); + error = cpuhp_setup_state(CPUHP_AP_RISCV_TIMER_STARTING, "clockevents/riscv/timer:starting", riscv_timer_starting_cpu, riscv_timer_dying_cpu); |