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  1. 12 10月, 2016 1 次提交
    • P
      kthread: kthread worker API cleanup · 3989144f
      由 Petr Mladek 提交于 
      A good practice is to prefix the names of functions by the name
of the subsystem.

The kthread worker API is a mix of classic kthreads and workqueues.  Each
worker has a dedicated kthread.  It runs a generic function that process
queued works.  It is implemented as part of the kthread subsystem.

This patch renames the existing kthread worker API to use
the corresponding name from the workqueues API prefixed by
kthread_:

__init_kthread_worker()		-> __kthread_init_worker()
init_kthread_worker()		-> kthread_init_worker()
init_kthread_work()		-> kthread_init_work()
insert_kthread_work()		-> kthread_insert_work()
queue_kthread_work()		-> kthread_queue_work()
flush_kthread_work()		-> kthread_flush_work()
flush_kthread_worker()		-> kthread_flush_worker()

Note that the names of DEFINE_KTHREAD_WORK*() macros stay
as they are. It is common that the "DEFINE_" prefix has
precedence over the subsystem names.

Note that INIT() macros and init() functions use different
naming scheme. There is no good solution. There are several
reasons for this solution:

  + "init" in the function names stands for the verb "initialize"
    aka "initialize worker". While "INIT" in the macro names
    stands for the noun "INITIALIZER" aka "worker initializer".

  + INIT() macros are used only in DEFINE() macros

  + init() functions are used close to the other kthread()
    functions. It looks much better if all the functions
    use the same scheme.

  + There will be also kthread_destroy_worker() that will
    be used close to kthread_cancel_work(). It is related
    to the init() function. Again it looks better if all
    functions use the same naming scheme.

  + there are several precedents for such init() function
    names, e.g. amd_iommu_init_device(), free_area_init_node(),
    jump_label_init_type(),  regmap_init_mmio_clk(),

  + It is not an argument but it was inconsistent even before.

[arnd@arndb.de: fix linux-next merge conflict]
 Link: http://lkml.kernel.org/r/20160908135724.1311726-1-arnd@arndb.de
Link: http://lkml.kernel.org/r/1470754545-17632-3-git-send-email-pmladek@suse.comSuggested-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NPetr Mladek <pmladek@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Borislav Petkov <bp@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      3989144f
  3. 03 4月, 2015 1 次提交
  5. 23 12月, 2014 1 次提交
  7. 03 9月, 2014 1 次提交
  9. 19 9月, 2012 1 次提交
  11. 16 8月, 2012 1 次提交
  13. 16 1月, 2012 1 次提交
  15. 03 3月, 2011 1 次提交
    • M
      [media] ivtv: Fix corrective action taken upon DMA ERR interrupt to avoid hang · d213ad08
      由 Michael 提交于 
      After upgrading the kernel from stock Ubuntu 7.10 to
10.04, with no hardware changes, I started getting the dreaded DMA
TIMEOUT errors, followed by inability to encode until the machine was
rebooted.

I came across a post from Andy in March
(http://www.gossamer-threads.com/lists/ivtv/users/40943#40943) where he
speculates that perhaps the corrective actions being taken after a DMA
ERROR are not sufficient to recover the situation.  After some testing
I suspect that this is indeed the case, and that in fact the corrective
action may be what hangs the card's DMA engine, rather than the
original error.

Specifically these DMA ERROR IRQs seem to present with two different
values in the IVTV_REG_DMASTATUS register: 0x11 and 0x13.  The current
corrective action is to clear that status register back to 0x01 or
0x03, and then issue the next DMA request.  In the case of a 0x13 this
seems to result in a minor glitch in the encoded stream due to the
failed transfer that was not retried, but otherwise things continue OK.
In the case of a 0x11 the card's DMA write engine is never heard from
again, and a DMA TIMEOUT follows shortly after.  0x11 is the killer.

I suspect that the two cases need to be handled differently.  The
difference is in bit 1 (0x02), which is set when the error is about to
be successfully recovered, and clear when things are about to go bad.

Bit 1 of DMASTATUS is described differently in different places either
as a positive "write finished", or an inverted "write busy".  If we
take the first definition, then when an error arises with state 0x11,
it means that the write did not complete.   It makes sense to start a
new transfer, as in the current code.  But if we take the second
definition, then 0x11 means "an error but the write engine is still
busy".  Trying to feed it a new transfer in this situation might not be
a good idea.

As an experiment, I added code to ignore the DMA ERROR IRQ if DMASTATUS
is 0x11.  I.e., don't start a new transfer, don't clear our flags, etc.
The hope was that the card would complete the transfer and issue a ENC
DMA COMPLETE, either successfully or with an error condition there.
However the card still hung.

The only remaining corrective action being taken with a 0x11 status was
then the write back to the status register to clear the error, i.e.
DMASTATUS = DMASTATUS & ~3.  This would have the effect of clearing the
error bit 4, while leaving the lower bits indicating DMA write busy.

Strangely enough, removing this write to the status register solved the
problem!  If the DMA ERROR IRQ with DMASTATUS=0x11 is completely
ignored, with no corrective action at all, then the card will complete
the transfer and issue a new IRQ.  If the status register is written to
when it has the value 0x11, then the DMA engine hangs.  Perhaps it's
illegal to write to
DMASTATUS while the read or write busy bit is set?  At any rate, it
appears that the current corrective action is indeed making things
worse rather than better.

I put together a patch that modifies ivtv_irq_dma_err to do the
following:

- Don't write back to IVTV_REG_DMASTATUS.
- If write-busy is asserted, leave the card alone.  Just extend the
timeout slightly.
- If write-busy is de-asserted, retry the current transfer.

This has completely fixed my DMA TIMEOUT woes.  DMA ERR events still
occur, but now they seem to be correctly handled.  0x11 events no
longer hang the card, and 0x13 events no longer result in a glitch in
the stream, as the failed transfer is retried.  I'm happy.

I've inlined the patch below in case it is of interest.  As described
above, I have a theory about why it works (based on a different
interpretation of bit 1 of DMASTATUS), but I can't guarantee that my
theory is correct.  There may be another explanation, or it may be a
fluke.  Maybe ignoring that IRQ entirely would be equally effective?
Maybe the status register read/writeback sequence is race condition if
the card changes it in the mean time?  Also as I am using a PVR-150
only, I have not been able to test it on other cards, which may be
especially relevant for 350s that support concurrent decoding.
Hopefully the patch does not break the DMA READ path.

Mike

[awalls@md.metrocast.net: Modified patch to add a verbose comment, make minor
brace reformats, and clear the error flags in the IVTV_REG_DMASTATUS iff both
read and write DMA were not in progress.  Mike's conjecture about a race
condition with the writeback is correct; it can confuse the DMA engine.]

[Comment and analysis from the ML post by Michael <mike@rsy.com>]
Signed-off-by: NAndy Walls <awalls@md.metrocast.net>
Cc: stable@kernel.org
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
      d213ad08
  17. 29 6月, 2010 1 次提交
    • T
      ivtv: use kthread_worker instead of workqueue · 7bc46560
      由 Tejun Heo 提交于 
      Upcoming workqueue updates will no longer guarantee fixed workqueue to
worker kthread association, so giving RT priority to the irq worker
won't work.  Use kthread_worker which guarantees specific kthread
association instead.  This also makes setting the priority cleaner.
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: Andy Walls <awalls@md.metrocast.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: ivtv-devel@ivtvdriver.org
Cc: linux-media@vger.kernel.org
      7bc46560
  19. 19 5月, 2010 1 次提交
  21. 18 5月, 2010 1 次提交
  23. 27 2月, 2010 2 次提交
  25. 10 5月, 2009 1 次提交
  27. 30 3月, 2009 1 次提交
  29. 13 10月, 2008 1 次提交
  31. 04 9月, 2008 1 次提交
  33. 05 6月, 2008 1 次提交
  35. 30 4月, 2008 1 次提交
  37. 25 4月, 2008 1 次提交
  39. 26 1月, 2008 7 次提交
  41. 11 10月, 2007 1 次提交
  43. 10 10月, 2007 10 次提交
  45. 21 7月, 2007 2 次提交