diff options
Diffstat (limited to 'drivers/clocksource/hyperv_timer.c')
| -rw-r--r-- | drivers/clocksource/hyperv_timer.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c index 287d8d58c21a..1aec08e82b7a 100644 --- a/drivers/clocksource/hyperv_timer.c +++ b/drivers/clocksource/hyperv_timer.c @@ -330,12 +330,37 @@ static u64 read_hv_sched_clock_tsc(void) return read_hv_clock_tsc(NULL) - hv_sched_clock_offset; } +static void suspend_hv_clock_tsc(struct clocksource *arg) +{ + u64 tsc_msr; + + /* Disable the TSC page */ + hv_get_reference_tsc(tsc_msr); + tsc_msr &= ~BIT_ULL(0); + hv_set_reference_tsc(tsc_msr); +} + + +static void resume_hv_clock_tsc(struct clocksource *arg) +{ + phys_addr_t phys_addr = virt_to_phys(&tsc_pg); + u64 tsc_msr; + + /* Re-enable the TSC page */ + hv_get_reference_tsc(tsc_msr); + tsc_msr &= GENMASK_ULL(11, 0); + tsc_msr |= BIT_ULL(0) | (u64)phys_addr; + hv_set_reference_tsc(tsc_msr); +} + static struct clocksource hyperv_cs_tsc = { .name = "hyperv_clocksource_tsc_page", .rating = 400, .read = read_hv_clock_tsc, .mask = CLOCKSOURCE_MASK(64), .flags = CLOCK_SOURCE_IS_CONTINUOUS, + .suspend= suspend_hv_clock_tsc, + .resume = resume_hv_clock_tsc, }; static u64 notrace read_hv_clock_msr(struct clocksource *arg) |