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

timer: Stop calling list_top() racily

2017-12-12T01:30:46+00:00

This will trip the debug checks in debug builds under some circumstances and is actually a rather bad idea as we might look at a timer that is concurrently being removed and modified, and thus incorrectly assume there is no work to do. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Stewart Smith

Convert important polling loops to spin at lowest SMT priority

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

The pattern of calling cpu_relax() inside a polling loop does not suit the powerpc SMT priority instructions. Prefrred is to set a low priority then spin until break condition is reached, then restore priority. Signed-off-by: Nicholas Piggin [stewart@linux.vnet.ibm.com: fixup lpc-uart wait_tx_room() and unit test] Signed-off-by: Stewart Smith

list: Use list_empty_nocheck() when checking a list racily

2016-08-18T06:04:26+00:00

Otherwise we might trigger an assertion when list debug is enabled Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Stewart Smith

core/timer: Add support for platform specific heartbeat

2016-07-22T07:09:52+00:00

The timer code currently has a default and a special check for FSP machines or those with SLW timer facility. This patch adds support for platform quirk to set the timer. Signed-off-by: Chris Smart Acked-by: Michael Neuling [stewart@linux.vnet.ibm.com: fix whitespace issue] Signed-off-by: Stewart Smith

core/timer: Actually use default heartbeat value

2016-07-22T07:08:54+00:00

HEARTBEAT_DEFAULT_MS sets the default heartbeat timeout, however this was not actually used as the default. The default was ten times quicker than this (HEARTBEAT_DEFAULT_MS / 10) while HEARTBEAT_DEFAULT_MS was actually used as a special case for FSP machines or those with SLW timer facility. This patch makes the default use HEARTBEAT_DEFAULT_MS and changes FSP or machines with SLW timer facility run 10 times slower (HEARTBEAT_DEFAULT_MS * 10). This will also now match the existing in-line comment. Signed-off-by: Chris Smart Acked-by: Michael Neuling Signed-off-by: Stewart Smith

slw/timer: SBE based timer support

2015-09-11T06:42:17+00:00

Recent HostBoot & SBE firmware provide a HW timer facility that can be used to implement OPAL timers and thus limit the reliance on the Linux heartbeat. This implements support for it. The side effect is that i2c from Centaurs is now usable. Signed-off-by: Benjamin Herrenschmidt [stewart@linux.vnet.ibm.com: fix run-timer unit test] Signed-off-by: Stewart Smith

timer: Pass current timer to timer callbacks

2015-09-11T06:32:37+00:00

The caller usually has it and it avoids additional mftb() which can be expensive. Signed-off-by: Benjamin Herrenschmidt [stewart@linux.vnet.ibm.com: fix run-timer unit test] 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

Move skiboot internal things from opal.h to opal-api.h

2015-02-06T02:11:25+00:00

This is probably not the best collection of things in the world, but it means that opal.h is much closer to being directly usable by an OS. This triggers a bunch of #include fixes throughout the tree. Signed-off-by: Stewart Smith

timer: Change property name "ibm,heartbeat-freq" -> "ibm,heartbeat-ms"

2014-11-14T05:07:26+00:00

Signed-off-by: Benjamin Herrenschmidt