perf: arm64: fix RCU usage on pmu resume from low-power

Commit ( perf: arm64: implement CPU_PM notifier)
added code in the arm perf infrastructure that allows the kernel to
save/restore perf counters whenever the CPU enters a low-power
state. The kernel saves/restores the counters for each active event
through the armpmu_{stop/start} ARM pmu API, so that the low-power state
enter/exit cycle is emulated through pmu start/stop operations for each
event in use.

However, calling armpmu_start() for each active event on power up
executes code that requires RCU locking (perf_event_update_userpage())
to be functional, so, given that the core may call the CPU_PM notifiers
while running the idle thread in an quiescent RCU state this is not
allowed as detected through the following splat when kernel is run with
CONFIG_PROVE_LOCKING enabled:

[   49.293286]
[   49.294761] ===============================
[   49.298895] [ INFO: suspicious RCU usage. ]
[   49.303031] 4.6.0-rc3+ #421 Not tainted
[   49.306821] -------------------------------
[   49.310956] include/linux/rcupdate.h:872 rcu_read_lock() used
illegally while idle!
[   49.318530]
[   49.318530] other info that might help us debug this:
[   49.318530]
[   49.326451]
[   49.326451] RCU used illegally from idle CPU!
[   49.326451] rcu_scheduler_active = 1, debug_locks = 0
[   49.337209] RCU used illegally from extended quiescent state!
[   49.342892] 2 locks held by swapper/2/0:
[   49.346768]  #0:  (cpu_pm_notifier_lock){......}, at:
[<ffffff8008163c28>] cpu_pm_exit+0x18/0x80
[   49.355492]  #1:  (rcu_read_lock){......}, at: [<ffffff800816dc38>]
perf_event_update_userpage+0x0/0x260

This patch wraps the armpmu_start() call (that indirectly calls
perf_event_update_userpage()) on CPU_PM notifier power state exit (or
failed entry) within the RCU_NONIDLE() macro so that the RCU subsystem
is made aware the calling cpu is not idle from an RCU perspective for
the armpmu_start() call duration, therefore fixing the issue.

(cherry-picked from angler kernel)
Bug: 30839193

Change-Id: I931833bc800d072eea17cf0ac5cd39a33af719c3

1 files changed, 13 insertions, 2 deletions

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index fa781e4f831f..386ca2617bbf 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1372,8 +1372,19 @@ static void cpu_pm_pmu_setup(struct arm_pmu *armpmu, unsigned long cmd)
 			break;
 		case CPU_PM_EXIT:
 		case CPU_PM_ENTER_FAILED:
-			/* Restore and enable the counter */
-			armpmu_start(event, PERF_EF_RELOAD);
+			/*
+			 * Restore and enable the counter.
+			 * armpmu_start() indirectly calls
+			 *
+			 * perf_event_update_userpage()
+			 *
+			 * that requires RCU read locking to be functional,
+			 * wrap the call within RCU_NONIDLE to make the
+			 * RCU subsystem aware this cpu is not idle from
+			 * an RCU perspective for the armpmu_start() call
+			 * duration.
+			 */
+			RCU_NONIDLE(armpmu_start(event, PERF_EF_RELOAD));
 			break;
 		default:
 			break;