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author | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-09-07 16:13:06 +0200 |
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committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-09-07 16:13:06 +0200 |
commit | d13ee586e026e8166231e03e5345718ebf625c02 (patch) | |
tree | 1bf8f5efab7bcf58c1c01fd7e529429e4cd8ada7 /drivers/hv/hv_util.c | |
parent | 72a9ff3bf7fbd7e887d4e6bbc1c04817da2b9887 (diff) | |
parent | f4d51dffc6c01a9e94650d95ce0104964f8ae822 (diff) | |
download | linux-stable-d13ee586e026e8166231e03e5345718ebf625c02.tar.gz linux-stable-d13ee586e026e8166231e03e5345718ebf625c02.tar.bz2 linux-stable-d13ee586e026e8166231e03e5345718ebf625c02.zip |
Merge tag 'v5.9-rc4' into patchwork
Linux 5.9-rc4
* tag 'v5.9-rc4': (1001 commits)
Linux 5.9-rc4
io_uring: fix linked deferred ->files cancellation
io_uring: fix cancel of deferred reqs with ->files
include/linux/log2.h: add missing () around n in roundup_pow_of_two()
mm/khugepaged.c: fix khugepaged's request size in collapse_file
mm/hugetlb: fix a race between hugetlb sysctl handlers
mm/hugetlb: try preferred node first when alloc gigantic page from cma
mm/migrate: preserve soft dirty in remove_migration_pte()
mm/migrate: remove unnecessary is_zone_device_page() check
mm/rmap: fixup copying of soft dirty and uffd ptes
mm/migrate: fixup setting UFFD_WP flag
mm: madvise: fix vma user-after-free
checkpatch: fix the usage of capture group ( ... )
fork: adjust sysctl_max_threads definition to match prototype
ipc: adjust proc_ipc_sem_dointvec definition to match prototype
mm: track page table modifications in __apply_to_page_range()
MAINTAINERS: IA64: mark Status as Odd Fixes only
MAINTAINERS: add LLVM maintainers
MAINTAINERS: update Cavium/Marvell entries
mm: slub: fix conversion of freelist_corrupted()
...
Diffstat (limited to 'drivers/hv/hv_util.c')
-rw-r--r-- | drivers/hv/hv_util.c | 65 |
1 files changed, 51 insertions, 14 deletions
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c index 92ee0fe4c919..a4e8d96513c2 100644 --- a/drivers/hv/hv_util.c +++ b/drivers/hv/hv_util.c @@ -282,26 +282,52 @@ static struct { spinlock_t lock; } host_ts; -static struct timespec64 hv_get_adj_host_time(void) +static inline u64 reftime_to_ns(u64 reftime) { - struct timespec64 ts; - u64 newtime, reftime; + return (reftime - WLTIMEDELTA) * 100; +} + +/* + * Hard coded threshold for host timesync delay: 600 seconds + */ +static const u64 HOST_TIMESYNC_DELAY_THRESH = 600 * (u64)NSEC_PER_SEC; + +static int hv_get_adj_host_time(struct timespec64 *ts) +{ + u64 newtime, reftime, timediff_adj; unsigned long flags; + int ret = 0; spin_lock_irqsave(&host_ts.lock, flags); reftime = hv_read_reference_counter(); - newtime = host_ts.host_time + (reftime - host_ts.ref_time); - ts = ns_to_timespec64((newtime - WLTIMEDELTA) * 100); + + /* + * We need to let the caller know that last update from host + * is older than the max allowable threshold. clock_gettime() + * and PTP ioctl do not have a documented error that we could + * return for this specific case. Use ESTALE to report this. + */ + timediff_adj = reftime - host_ts.ref_time; + if (timediff_adj * 100 > HOST_TIMESYNC_DELAY_THRESH) { + pr_warn_once("TIMESYNC IC: Stale time stamp, %llu nsecs old\n", + (timediff_adj * 100)); + ret = -ESTALE; + } + + newtime = host_ts.host_time + timediff_adj; + *ts = ns_to_timespec64(reftime_to_ns(newtime)); spin_unlock_irqrestore(&host_ts.lock, flags); - return ts; + return ret; } static void hv_set_host_time(struct work_struct *work) { - struct timespec64 ts = hv_get_adj_host_time(); - do_settimeofday64(&ts); + struct timespec64 ts; + + if (!hv_get_adj_host_time(&ts)) + do_settimeofday64(&ts); } /* @@ -361,10 +387,23 @@ static void timesync_onchannelcallback(void *context) struct ictimesync_ref_data *refdata; u8 *time_txf_buf = util_timesynch.recv_buffer; - vmbus_recvpacket(channel, time_txf_buf, - HV_HYP_PAGE_SIZE, &recvlen, &requestid); + /* + * Drain the ring buffer and use the last packet to update + * host_ts + */ + while (1) { + int ret = vmbus_recvpacket(channel, time_txf_buf, + HV_HYP_PAGE_SIZE, &recvlen, + &requestid); + if (ret) { + pr_warn_once("TimeSync IC pkt recv failed (Err: %d)\n", + ret); + break; + } + + if (!recvlen) + break; - if (recvlen > 0) { icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[ sizeof(struct vmbuspipe_hdr)]; @@ -622,9 +661,7 @@ static int hv_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) static int hv_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts) { - *ts = hv_get_adj_host_time(); - - return 0; + return hv_get_adj_host_time(ts); } static struct ptp_clock_info ptp_hyperv_info = { |