[PATCHv6 00/16] pps: several fixes and improvements

Alexander Gordeev
2010-12-17T19:55:07Z

This patchset contains several changes that improve an overall
design/performance of PPS subsystem. I'd like these patches to be
merged mainline if no one objects.

Patches 1-3 are bugfixes.
Patches 4-11 are other improvements to PPS subsystem.
Patches 12-14 add kernel consumer support.
Patch 15 adds parallel port PPS client.
Patch 16 adds parallel port PPS generator.

You can find description for my previous patchset (it describes patches
12-16 in more detail) here: http://lkml.org/lkml/2010/2/24/189

This patchset is tested against the vanilla 2.6.37-rc6 kernel. But we are
actually using it on 2.6.33.7-rt29 rt-preempt kernel most of the time.
Those who are interested in other versions of the patchset can find
them in my git repository:
git://github.com/ago/linux-2.6.git

There is one problem however: kernel consumer works bad (if enabled)
when CONFIG_NO_HZ is enabled. The reason for this is commit
a092ff0f90cae22b2ac8028ecd2c6f6c1a9e4601. Without it hardpps() is able
to sync to 1us precision in about 10 seconds. With CONFIG_NO_HZ it is
not syncing at all. This only affects patches 12-14, others are ok.

Changelog
v5 -> v6:
* drop patch that fixes a race condition in tty code because it's already
fixed in 2.6.37-rc2
* fix getnstime_raw_and_real() comments (thanks Thomas Gleixner for the note)

Alexander Gordeev (16):
pps: trivial fixes
pps: declare variables where they are used in switch
pps: fix race in PPS_FETCH handler
pps: unify timestamp gathering
pps: access pps device by direct pointer
pps: convert printk/pr_* to dev_*
pps: move idr stuff to pps.c
pps: do not disable interrupts for idr operations
pps: use BUG_ON for kernel API safety checks
pps: simplify conditions a bit
pps: timestamp is always passed to dcd_change()
ntp: add hardpps implementation
pps: capture MONOTONIC_RAW timestamps as well
pps: add kernel consumer support
pps: add parallel port PPS client
pps: add parallel port PPS signal generator

Documentation/ioctl/ioctl-number.txt | 2 +-
Documentation/pps/pps.txt | 46 ++++
Documentation/serial/tty.txt | 2 +-
drivers/pps/Kconfig | 10 +
drivers/pps/Makefile | 2 +-
drivers/pps/clients/Kconfig | 7 +
drivers/pps/clients/Makefile | 1 +
drivers/pps/clients/pps-ktimer.c | 44 ++--
drivers/pps/clients/pps-ldisc.c | 59 ++--
drivers/pps/clients/pps_parport.c | 247 +++++++++++++++++
drivers/pps/generators/Kconfig | 17 ++
drivers/pps/generators/Makefile | 9 +
drivers/pps/generators/pps_gen_parport.c | 275 +++++++++++++++++++
drivers/pps/kapi.c | 221 +++++-----------
drivers/pps/pps.c | 177 ++++++++++---
include/linux/pps.h | 7 +
include/linux/pps_kernel.h | 54 +++-
include/linux/serial_core.h | 5 +-
include/linux/time.h | 2 +
include/linux/timex.h | 1 +
include/linux/tty_ldisc.h | 7 +-
kernel/time/ntp.c | 425 ++++++++++++++++++++++++++++-
kernel/time/timekeeping.c | 39 +++
23 files changed, 1374 insertions(+), 285 deletions(-)
create mode 100644 drivers/pps/clients/pps_parport.c
create mode 100644 drivers/pps/generators/Kconfig
create mode 100644 drivers/pps/generators/Makefile
create mode 100644 drivers/pps/generators/pps_gen_parport.c

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1.7.2.3