talos-skiboot/core/timebase.c, branch master

lock: Add additional lock auditing code

2017-12-21T04:15:36+00:00

Keep track of lock owner name and replace lock_depth counter with a per-cpu list of locks held by the cpu. This allows us to print the actual locks held in case we hit the (in)famous message about opal_pollers being run with a lock held. It also allows us to warn (and drop them) if locks are still held when returning to the OS or completing a scheduled job. Signed-off-by: Benjamin Herrenschmidt Reviewed-by: Nicholas Piggin [stewart: fix unit tests] Signed-off-by: Stewart Smith

cpu: idle move the minimum PM latency into the idle code

2017-09-28T05:30:02+00:00

The caller isn't in a position to know about PM heuristics, so move the minimum timeout before power managmeent into the cpu idle call. There is no functional change. Signed-off-by: Nicholas Piggin Signed-off-by: Stewart Smith

Improve cpu_idle when PM is disabled

2017-06-06T10:49:06+00:00

Split cpu_idle() into cpu_idle_delay() and cpu_idle_job() rather than requesting the idle type as a function argument. Have those functions provide a default polling (non-PM) implentation which spin at the lowest SMT priority. This moves all the decrementer delay code into the CPU idle code rather than the caller. Signed-off-by: Nicholas Piggin Signed-off-by: Stewart Smith

time: Setup DEC and call cpu_idle() in time_wait_nopoll()

2016-08-22T05:26:51+00:00

This will currently do nothing more than spin but will eventually allow us to nap until the decrementer fires. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Stewart Smith

time: Improve time_wait_poll()

2016-08-11T09:54:23+00:00

Call time_wait_nopoll() when period is smaller than remaining Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Stewart Smith

Timebase quirk for slow simulators like AWAN and SIMICS

2016-07-06T09:30:48+00:00

This will internally pretend the timebase is running 1000 times slower, which reduces some otherwise really terrible delays in some simulators. Signed-off-by: Benjamin Herrenschmidt Acked-by: Michael Neuling [stewart@linux.vnet.ibm.com: move cfam_chipid cleanup into own patch] Signed-off-by: Stewart Smith

opal: Fix hang in time_wait* calls on HMI for TB errors.

2015-09-15T01:15:16+00:00

On TOD/TB errors timebase register stops/freezes until HMI error recovery gets TOD/TB back into running state. However, while HMI recovery is in progress there are chances where some code path may invoke time_wait*() calls which depends on running TB value. In an event of TB not moving, time_wait* calls would keep looping resulting into a hang on that CPU. On OpenPower systems we are seeing system hang on TOD/TB errors. The hang is seen inside OPAL HMI handler while invoking prlog/perror(). The reason is, on OpenPower systems prlog/perror() depends on LPC UART console driver to flush log messages to the console. UART read/write calls invoke time_wait_nopoll() inside opb_[read|write]() functions. When TB is in stopped state this causes a hang in prlog/perror() calls. This patch fixes this issue by modifying time_wait_[no]poll() to check for TB validity and return immediately. Signed-off-by: Mahesh Salgaonkar Signed-off-by: Stewart Smith

Remove redundant includes of opal-api.h

2015-04-01T01:16:39+00:00

Now that opal.h includes opal-api.h, there are a bunch of files that include both but don't need to. Signed-off-by: Michael Ellerman Signed-off-by: Stewart Smith

Don't run pollers in time_wait() when a lock is held

2015-02-18T04:22:24+00:00

Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Stewart Smith

timebase: Add nanosleep_nopoll

2015-02-17T03:54:13+00:00

For use by hservices mainly... Signed-off-by: Ananth N Mavinakayanahalli Acked-by: Benjamin Herrenschmidt Signed-off-by: Stewart Smith