Files
kernel_google_wahoo/include/linux
Lorenzo Pieralisi fbea122e3f UPSTREAM: drivers/perf: arm_pmu: implement CPU_PM notifier
(cherry picked from commit da4e4f18afe0f3729d68f3785c5802f786d36e34)

When a CPU is suspended (either through suspend-to-RAM or CPUidle),
its PMU registers content can be lost, which means that counters
registers values that were initialized on power down entry have to be
reprogrammed on power-up to make sure the counters set-up is preserved
(ie on power-up registers take the reset values on Cold or Warm reset,
which can be architecturally UNKNOWN).

To guarantee seamless profiling conditions across a core power down
this patch adds a CPU PM notifier to ARM pmus, that upon CPU PM
entry/exit from low-power states saves/restores the pmu registers
set-up (by using the ARM perf API), so that the power-down/up cycle does
not affect the perf behaviour (apart from a black-out period between
power-up/down CPU PM notifications that is unavoidable).

Change-Id: Ifbd73b82ca9dc172c58e2488cda1af9af975b14f
Cc: Will Deacon <will.deacon@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-06-28 12:35:41 -07:00
..
2015-10-01 12:48:11 -07:00
2015-06-25 11:49:31 +03:00
2015-10-17 21:22:08 -07:00
2015-10-07 18:08:15 +01:00
2015-08-27 20:47:09 +01:00
2016-08-20 18:09:25 +02:00
2017-05-15 09:25:05 +02:00
2016-03-09 15:34:52 -08:00
2015-11-07 10:40:47 -07:00
2017-06-14 13:16:23 +02:00
2017-01-03 11:10:55 -08:00
2015-09-08 15:35:28 -07:00
2015-10-18 10:14:39 -07:00
2017-05-14 13:32:59 +02:00
2015-06-24 17:49:45 -07:00
2017-06-14 16:33:25 +02:00
2016-02-16 13:50:55 -08:00
2015-09-08 15:35:28 -07:00
2016-04-20 15:42:02 +09:00
2015-10-23 05:44:28 -07:00
2015-08-27 19:40:58 -04:00
2015-10-01 15:06:43 +02:00
2015-10-13 19:01:25 +02:00
2015-06-25 12:06:45 +02:00
2016-10-28 03:01:30 -04:00
2015-08-18 15:49:15 -07:00
2015-07-28 08:50:42 +01:00
2015-11-23 09:44:58 +01:00
2017-06-14 16:33:25 +02:00
2015-10-27 18:55:31 -07:00
2015-06-24 17:49:41 -07:00
2017-06-27 09:47:59 +02:00
2017-06-14 16:33:25 +02:00
2017-04-30 07:30:52 +02:00
2015-10-20 22:10:45 +08:00
2015-07-21 10:39:05 -07:00
2015-06-25 04:20:04 -04:00
2016-03-03 15:07:28 -08:00
2015-09-10 13:29:01 -07:00
2015-09-10 13:29:01 -07:00
2015-11-06 17:50:42 -08:00
2016-12-08 07:15:24 +01:00
2015-10-09 17:00:32 -04:00
2015-10-06 17:08:19 +02:00
2015-06-25 01:13:43 +02:00
2016-09-06 15:53:36 +00:00
2016-09-30 10:18:37 +02:00
2016-10-28 03:01:30 -04:00
2015-06-25 17:00:39 -07:00
2016-04-12 09:08:35 -07:00
2015-08-17 11:25:28 -07:00
2015-10-01 09:57:59 -07:00
2015-10-19 01:01:21 +02:00
2016-06-01 12:15:52 -07:00
2015-11-23 09:44:58 +01:00
2015-12-04 08:38:42 -07:00
2015-12-13 14:30:59 -08:00
2015-11-13 20:34:33 -05:00
2015-09-08 15:35:28 -07:00