[PATCH v2 11/44] cpuidle,omap4: Push RCU-idle into driver

Peter Zijlstra
2022-09-19T10:17:07Z

Doing RCU-idle outside the driver, only to then temporarily enable it
again, some *four* times, before going idle is daft.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Tested-by: Tony Lindgren <tony@atomide.com>
---
arch/arm/mach-omap2/cpuidle44xx.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)

--- a/arch/arm/mach-omap2/cpuidle44xx.c
+++ b/arch/arm/mach-omap2/cpuidle44xx.c
@@ -105,7 +105,9 @@ static int omap_enter_idle_smp(struct cp
}
raw_spin_unlock_irqrestore(&mpu_lock, flag);

+ ct_idle_enter();
omap4_enter_lowpower(dev->cpu, cx->cpu_state);
+ ct_idle_exit();

raw_spin_lock_irqsave(&mpu_lock, flag);
if (cx->mpu_state_vote == num_online_cpus())
@@ -151,10 +153,10 @@ static int omap_enter_idle_coupled(struc
(cx->mpu_logic_state == PWRDM_POWER_OFF);

/* Enter broadcast mode for periodic timers */
- RCU_NONIDLE(tick_broadcast_enable());
+ tick_broadcast_enable();

/* Enter broadcast mode for one-shot timers */
- RCU_NONIDLE(tick_broadcast_enter());
+ tick_broadcast_enter();

/*
* Call idle CPU PM enter notifier chain so that
@@ -166,7 +168,7 @@ static int omap_enter_idle_coupled(struc

if (dev->cpu == 0) {
pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state);
- RCU_NONIDLE(omap_set_pwrdm_state(mpu_pd, cx->mpu_state));
+ omap_set_pwrdm_state(mpu_pd, cx->mpu_state);

/*
* Call idle CPU cluster PM enter notifier chain
@@ -178,14 +180,16 @@ static int omap_enter_idle_coupled(struc
index = 0;
cx = state_ptr + index;
pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state);
- RCU_NONIDLE(omap_set_pwrdm_state(mpu_pd, cx->mpu_state));
+ omap_set_pwrdm_state(mpu_pd, cx->mpu_state);
mpuss_can_lose_context = 0;
}
}
}

+ ct_idle_enter();
omap4_enter_lowpower(dev->cpu, cx->cpu_state);
cpu_done[dev->cpu] = true;
+ ct_idle_exit();

/* Wakeup CPU1 only if it is not offlined */
if (dev->cpu == 0 && cpumask_test_cpu(1, cpu_online_mask)) {
@@ -194,9 +198,9 @@ static int omap_enter_idle_coupled(struc
mpuss_can_lose_context)
gic_dist_disable();

- RCU_NONIDLE(clkdm_deny_idle(cpu_clkdm[1]));
- RCU_NONIDLE(omap_set_pwrdm_state(cpu_pd[1], PWRDM_POWER_ON));
- RCU_NONIDLE(clkdm_allow_idle(cpu_clkdm[1]));
+ clkdm_deny_idle(cpu_clkdm[1]);
+ omap_set_pwrdm_state(cpu_pd[1], PWRDM_POWER_ON);
+ clkdm_allow_idle(cpu_clkdm[1]);

if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD) &&
mpuss_can_lose_context) {
@@ -222,7 +226,7 @@ static int omap_enter_idle_coupled(struc
cpu_pm_exit();

cpu_pm_out:
- RCU_NONIDLE(tick_broadcast_exit());
+ tick_broadcast_exit();

fail:
cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
@@ -247,7 +251,8 @@ static struct cpuidle_driver omap4_idle_
/* C2 - CPU0 OFF + CPU1 OFF + MPU CSWR */
.exit_latency = 328 + 440,
.target_residency = 960,
- .flags = CPUIDLE_FLAG_COUPLED,
+ .flags = CPUIDLE_FLAG_COUPLED |
+ CPUIDLE_FLAG_RCU_IDLE,
.enter = omap_enter_idle_coupled,
.name = "C2",
.desc = "CPUx OFF, MPUSS CSWR",
@@ -256,7 +261,8 @@ static struct cpuidle_driver omap4_idle_
/* C3 - CPU0 OFF + CPU1 OFF + MPU OSWR */
.exit_latency = 460 + 518,
.target_residency = 1100,
- .flags = CPUIDLE_FLAG_COUPLED,
+ .flags = CPUIDLE_FLAG_COUPLED |
+ CPUIDLE_FLAG_RCU_IDLE,
.enter = omap_enter_idle_coupled,
.name = "C3",
.desc = "CPUx OFF, MPUSS OSWR",
@@ -282,7 +288,8 @@ static struct cpuidle_driver omap5_idle_
/* C2 - CPU0 RET + CPU1 RET + MPU CSWR */
.exit_latency = 48 + 60,
.target_residency = 100,
- .flags = CPUIDLE_FLAG_TIMER_STOP,
+ .flags = CPUIDLE_FLAG_TIMER_STOP |
+ CPUIDLE_FLAG_RCU_IDLE,
.enter = omap_enter_idle_smp,
.name = "C2",
.desc = "CPUx CSWR, MPUSS CSWR",