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gerrit.openbmc.org / openbmc / phosphor-time-manager / 4e84539349dac086ce2a58e5b9900ed4e40a2eaf
commit4e84539349dac086ce2a58e5b9900ed4e40a2eaf[log] [tgz]
authorBrad Bishop <bradleyb@fuzziesquirrel.com>Tue Dec 18 18:13:12 2018 -0500
committerBrad Bishop <bradleyb@fuzziesquirrel.com>Wed Dec 19 13:38:46 2018 +0000
tree1b5f3655927b8c5c1685179acddbe82927ac3980
parent37539dcc2b8c735d03a7c2840ad9ae04180da142 [diff]
Use a single dbus connection object

Starting with sdbusplus 8ca6025, calling bus_new_default multiple times
doesn't seem to work - making calls that generate dbus traffic on one
of the objects results in something like:

  sd_bus_call: System.Error.ENOTCONN: Transport endpoint is not connected

This wasn't ideal anyway - move to a single object, shared
application-wide.

Tested: Booted a witherspoon QEMU image and there were no coredumps
Change-Id: I804a1b1438b22f48e45b26d395135e401ca98a06
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
3 files changed
tree: 1b5f3655927b8c5c1685179acddbe82927ac3980
  1. test/
  2. .clang-format
  3. .gitignore
  4. bmc_epoch.cpp
  5. bmc_epoch.hpp
  6. bmc_time_change_listener.hpp
  7. bootstrap.sh
  8. configure.ac
  9. epoch_base.cpp
  10. epoch_base.hpp
  11. host_epoch.cpp
  12. host_epoch.hpp
  13. LICENSE
  14. main.cpp
  15. MAINTAINERS
  16. Makefile.am
  17. manager.cpp
  18. manager.hpp
  19. property_change_listener.hpp
  20. README.md
  21. settings.cpp
  22. settings.hpp
  23. types.hpp
  24. utils.cpp
  25. utils.hpp
README.md

Introduction

phosphor-time-manager is the time manager service that implements D-Bus interface xyz/openbmc_project/Time/EpochTime.interface.yaml. The user can get or set the BMC's or HOST's time via this interface.

General usage

The service xyz.openbmc_project.Time.Manager provides two objects on D-Bus:

  • /xyz/openbmc_project/time/bmc
  • /xyz/openbmc_project/time/host

where each object implements interface xyz.openbmc_project.Time.EpochTime.

The user can directly get or set the property Elapsed of the objects to get or set the time. For example on an authenticated session:

  • To get BMC's time:
    ### With busctl on BMC
busctl get-property xyz.openbmc_project.Time.Manager \
    /xyz/openbmc_project/time/bmc xyz.openbmc_project.Time.EpochTime Elapsed

### With REST API on remote host
curl -b cjar -k https://${BMC_IP}/xyz/openbmc_project/time/bmc
  • To set HOST's time:
    ### With busctl on BMC
busctl set-property xyz.openbmc_project.Time.Manager \
    /xyz/openbmc_project/time/host xyz.openbmc_project.Time.EpochTime \
    Elapsed t <value-in-microseconds>

### With REST API on remote host
curl -b cjar -k -H "Content-Type: application/json" -X PUT \
    -d '{"data": 1487304700000000}' \
    https://${BMC_IP}/xyz/openbmc_project/time/host/attr/Elapsed

Time settings

Getting BMC or HOST time is always allowed, but setting the time may not be allowed depending on the below two settings in the settings manager.

  • TimeSyncMethod
    • NTP: The time is set via NTP server.
    • MANUAL: The time is set manually.
  • TimeOwner
    • BMC: BMC owns the time and can set the time.
    • HOST: Host owns the time and can set the time.
    • SPLIT: BMC and Host own separate time.
    • BOTH: Both BMC and Host can set the time.

A summary of which cases the time can be set on BMC or HOST:

ModeOwnerSet BMC TimeSet Host Time
NTPBMCFail to setNot allowed
NTPHOSTNot allowedNot allowed
NTPSPLITFail to setOK
NTPBOTHFail to setNot allowed
MANUALBMCOKNot allowed
MANUALHOSTNot allowedOK
MANUALSPLITOKOK
MANUALBOTHOKOK

  • To set an NTP server:

    ### With busctl on BMC
busctl set-property  xyz.openbmc_project.Network \
   /xyz/openbmc_project/network/eth0 \
   xyz.openbmc_project.Network.EthernetInterface NTPServers \
   as 1 "<ntp_server>"

### With REST API on remote host
curl -c cjar -b cjar -k -H "Content-Type: application/json" -X  PUT  -d \
    '{"data": ["<ntp_server>"] }' \
    https://${BMC_IP}/xyz/openbmc_project/network/eth0/attr/NTPServers

  • To go into NTP mode

    ### With busctl on BMC
busctl set-property xyz.openbmc_project.Settings \
    /xyz/openbmc_project/time/sync_method xyz.openbmc_project.Time.Synchronization \
    TimeSyncMethod s "xyz.openbmc_project.Time.Synchronization.Method.NTP"

### With REST API on remote host
curl -c cjar -b cjar -k -H "Content-Type: application/json" -X  PUT  -d \
    '{"data": "xyz.openbmc_project.Time.Synchronization.Method.NTP" }' \
    https://${BMC_IP}/xyz/openbmc_project/time/sync_method/attr/TimeSyncMethod

  • To change owner

    ### With busctl on BMC
busctl set-property xyz.openbmc_project.Settings \
    /xyz/openbmc_project/time/owner xyz.openbmc_project.Time.Owner \
    TimeOwner s xyz.openbmc_project.Time.Owner.Owners.BMC

### With REST API on remote host
curl -c cjar -b cjar -k -H "Content-Type: application/json" -X  PUT  -d \
    '{"data": "xyz.openbmc_project.Time.Owner.Owners.BMC" }' \
    https://${BMC_IP}/xyz/openbmc_project/time/owner/attr/TimeOwner

Special note on host on

When the host is on, the changes of the above time mode/owner are not applied but deferred. The changes of the mode/owner are saved to persistent storage.

When the host is off, the saved mode/owner are read from persistent storage and are applied.

Note: A user can set the time mode and owner in the settings daemon at any time, but the time manager applying them is governed by the above condition.