linux-kernel - [PATCH v2 3/8] drivers: firmware: psci: Decouple checker from generic ARM CPUidle

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Message-Id: <5f7e39dd44f69eee926dec582caeb3b626bf15eb.1565348376.git.lorenzo.pieralisi@arm.com>
Date:   Fri,  9 Aug 2019 12:03:09 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     linux-pm@...r.kernel.org
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Shawn Guo <shawnguo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2 3/8] drivers: firmware: psci: Decouple checker from generic ARM CPUidle

The PSCI checker currently relies on the generic ARM CPUidle
infrastructure to enter an idle state, which in turn creates
a dependency that is not really needed.

The PSCI checker code to test PSCI CPU suspend is built on
top of the CPUidle framework and can easily reuse the
struct cpuidle_state.enter() function (previously initialized
by an idle driver, with a PSCI back-end) to trigger an entry
into an idle state, decoupling the PSCI checker from the
generic ARM CPUidle infrastructure and simplyfing the code
in the process.

Convert the PSCI checker suspend entry function to use
the struct cpuidle_state.enter() function callback.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@....com>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Mark Rutland <mark.rutland@....com>
---
 drivers/firmware/psci/psci_checker.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/firmware/psci/psci_checker.c b/drivers/firmware/psci/psci_checker.c
index f3659443f8c2..6a445397771c 100644
--- a/drivers/firmware/psci/psci_checker.c
+++ b/drivers/firmware/psci/psci_checker.c
@@ -228,8 +228,11 @@ static int hotplug_tests(void)
 
 static void dummy_callback(struct timer_list *unused) {}
 
-static int suspend_cpu(int index, bool broadcast)
+static int suspend_cpu(struct cpuidle_device *dev,
+		       struct cpuidle_driver *drv, int index)
 {
+	struct cpuidle_state *state = &drv->states[index];
+	bool broadcast = state->flags & CPUIDLE_FLAG_TIMER_STOP;
 	int ret;
 
 	arch_cpu_idle_enter();
@@ -254,11 +257,7 @@ static int suspend_cpu(int index, bool broadcast)
 		}
 	}
 
-	/*
-	 * Replicate the common ARM cpuidle enter function
-	 * (arm_enter_idle_state).
-	 */
-	ret = CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, index);
+	ret = state->enter(dev, drv, index);
 
 	if (broadcast)
 		tick_broadcast_exit();
@@ -301,9 +300,8 @@ static int suspend_test_thread(void *arg)
 		 * doesn't use PSCI).
 		 */
 		for (index = 1; index < drv->state_count; ++index) {
-			struct cpuidle_state *state = &drv->states[index];
-			bool broadcast = state->flags & CPUIDLE_FLAG_TIMER_STOP;
 			int ret;
+			struct cpuidle_state *state = &drv->states[index];
 
 			/*
 			 * Set the timer to wake this CPU up in some time (which
@@ -318,7 +316,7 @@ static int suspend_test_thread(void *arg)
 			/* IRQs must be disabled during suspend operations. */
 			local_irq_disable();
 
-			ret = suspend_cpu(index, broadcast);
+			ret = suspend_cpu(dev, drv, index);
 
 			/*
 			 * We have woken up. Re-enable IRQs to handle any
-- 
2.21.0