diff options
| author | Michael Kelley <mikelley@microsoft.com> | 2021-03-02 13:38:19 -0800 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-03-08 17:33:00 +0000 |
| commit | e4ab4658f1cff14c82202132f7af2cb5c2741469 (patch) | |
| tree | 771f56f1af6535734166428429020c84561c738c /drivers | |
| parent | d608715d4771cf2d63de07a5d7b026b6f52a70a5 (diff) | |
clocksource/drivers/hyper-v: Handle vDSO differences inline
While the driver for the Hyper-V Reference TSC and STIMERs is architecture
neutral, vDSO is implemented for x86/x64, but not for ARM64. Current code
calls into utility functions under arch/x86 (and coming, under arch/arm64)
to handle the difference.
Change this approach to handle the difference inline based on whether
VDSO_CLOCK_MODE_HVCLOCK is present. The new approach removes code under
arch/* since the difference is tied more to the specifics of the Linux
implementation than to the architecture.
No functional change.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1614721102-2241-8-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/clocksource/hyperv_timer.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c index c73c1271e8b8..06984fa11936 100644 --- a/drivers/clocksource/hyperv_timer.c +++ b/drivers/clocksource/hyperv_timer.c @@ -370,11 +370,13 @@ static void resume_hv_clock_tsc(struct clocksource *arg) hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr); } +#ifdef VDSO_CLOCKMODE_HVCLOCK static int hv_cs_enable(struct clocksource *cs) { - hv_enable_vdso_clocksource(); + vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK); return 0; } +#endif static struct clocksource hyperv_cs_tsc = { .name = "hyperv_clocksource_tsc_page", @@ -384,7 +386,12 @@ static struct clocksource hyperv_cs_tsc = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, .suspend= suspend_hv_clock_tsc, .resume = resume_hv_clock_tsc, +#ifdef VDSO_CLOCKMODE_HVCLOCK .enable = hv_cs_enable, + .vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK, +#else + .vdso_clock_mode = VDSO_CLOCKMODE_NONE, +#endif }; static u64 notrace read_hv_clock_msr(void) @@ -442,7 +449,6 @@ static bool __init hv_init_tsc_clocksource(void) tsc_msr = tsc_msr | 0x1 | (u64)phys_addr; hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr); - hv_set_clocksource_vdso(hyperv_cs_tsc); clocksource_register_hz(&hyperv_cs_tsc, NSEC_PER_SEC/100); hv_sched_clock_offset = hv_read_reference_counter(); |