diff options
| author | Andrea Parri <parri.andrea@gmail.com> | 2020-01-09 17:06:49 +0100 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2020-01-16 19:09:02 +0100 |
| commit | 0af3e137c144377fbaf5025ba784ff5ba7ad40c9 (patch) | |
| tree | e7061dcf97329e37ca4a45d5882a6582765da744 /drivers/hv | |
| parent | b9c60a741f06eda56d12c7216accb317b74266b4 (diff) | |
| download | linux-0af3e137c144377fbaf5025ba784ff5ba7ad40c9.tar.bz2 | |
clocksource/drivers/hyper-v: Untangle stimers and timesync from clocksources
hyperv_timer.c exports hyperv_cs, which is used by stimers and the
timesync mechanism. However, the clocksource dependency is not
needed: these mechanisms only depend on the partition reference
counter (which can be read via a MSR or via the TSC Reference Page).
Introduce the (function) pointer hv_read_reference_counter, as an
embodiment of the partition reference counter read, and export it
in place of the hyperv_cs pointer. The latter can be removed.
This should clarify that there's no relationship between Hyper-V
stimers & timesync and the Linux clocksource abstractions. No
functional or semantic change.
Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200109160650.16150-2-parri.andrea@gmail.com
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/hv_util.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c index 766bd8457346..296f9098c9e4 100644 --- a/drivers/hv/hv_util.c +++ b/drivers/hv/hv_util.c @@ -211,7 +211,7 @@ static struct timespec64 hv_get_adj_host_time(void) unsigned long flags; spin_lock_irqsave(&host_ts.lock, flags); - reftime = hyperv_cs->read(hyperv_cs); + reftime = hv_read_reference_counter(); newtime = host_ts.host_time + (reftime - host_ts.ref_time); ts = ns_to_timespec64((newtime - WLTIMEDELTA) * 100); spin_unlock_irqrestore(&host_ts.lock, flags); @@ -250,7 +250,7 @@ static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 adj_flags) */ spin_lock_irqsave(&host_ts.lock, flags); - cur_reftime = hyperv_cs->read(hyperv_cs); + cur_reftime = hv_read_reference_counter(); host_ts.host_time = hosttime; host_ts.ref_time = cur_reftime; @@ -315,7 +315,7 @@ static void timesync_onchannelcallback(void *context) sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr)]; adj_guesttime(timedatap->parenttime, - hyperv_cs->read(hyperv_cs), + hv_read_reference_counter(), timedatap->flags); } } @@ -524,7 +524,7 @@ static struct ptp_clock *hv_ptp_clock; static int hv_timesync_init(struct hv_util_service *srv) { /* TimeSync requires Hyper-V clocksource. */ - if (!hyperv_cs) + if (!hv_read_reference_counter) return -ENODEV; spin_lock_init(&host_ts.lock); |