[PATCH v3 37/51] cpuidle,omap3: Push RCU-idle into omap_sram_idle()

Peter Zijlstra
Thu, 12 Jan 2023 19:43:51 -0000

OMAP3 uses full SoC suspend modes as idle states, as such it needs the
whole power-domain and clock-domain code from the idle path.

All that code is not suitable to run with RCU disabled, as such push
RCU-idle deeper still.

Signed-off-by: Peter Zijlstra (Intel) <peterz at infradead.org>
Reviewed-by: Tony Lindgren <tony at atomide.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Acked-by: Frederic Weisbecker <frederic at kernel.org>
Tested-by: Tony Lindgren <tony at atomide.com>
Tested-by: Ulf Hansson <ulf.hansson at linaro.org>
---
 arch/arm/mach-omap2/cpuidle34xx.c |    4 +---
 arch/arm/mach-omap2/pm.h          |    2 +-
 arch/arm/mach-omap2/pm34xx.c      |   12 ++++++++++--
 3 files changed, 12 insertions(+), 6 deletions(-)

--- a/arch/arm/mach-omap2/cpuidle34xx.c
+++ b/arch/arm/mach-omap2/cpuidle34xx.c
@@ -133,9 +133,7 @@ static int omap3_enter_idle(struct cpuid
 	}

 	/* Execute ARM wfi */
-	ct_cpuidle_enter();
-	omap_sram_idle();
-	ct_cpuidle_exit();
+	omap_sram_idle(true);

 	/*
 	 * Call idle CPU PM enter notifier chain to restore
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -29,7 +29,7 @@ static inline int omap4_idle_init(void)

 extern void *omap3_secure_ram_storage;
 extern void omap3_pm_off_mode_enable(int);
-extern void omap_sram_idle(void);
+extern void omap_sram_idle(bool rcuidle);
 extern int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused);

 #if defined(CONFIG_PM_OPP)
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -26,6 +26,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/cpuidle.h>

 #include <trace/events/power.h>

@@ -174,7 +175,7 @@ static int omap34xx_do_sram_idle(unsigne
 	return 0;
 }

-void omap_sram_idle(void)
+void omap_sram_idle(bool rcuidle)
 {
 	/* Variable to tell what needs to be saved and restored
 	 * in omap_sram_idle*/
@@ -254,11 +255,18 @@ void omap_sram_idle(void)
 	 */
 	if (save_state)
 		omap34xx_save_context(omap3_arm_context);
+
+	if (rcuidle)
+		ct_cpuidle_enter();
+
 	if (save_state == 1 || save_state == 3)
 		cpu_suspend(save_state, omap34xx_do_sram_idle);
 	else
 		omap34xx_do_sram_idle(save_state);

+	if (rcuidle)
+		ct_cpuidle_exit();
+
 	/* Restore normal SDRC POWER settings */
 	if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0
&&
 	    (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
@@ -316,7 +324,7 @@ static int omap3_pm_suspend(void)

 	omap3_intc_suspend();

-	omap_sram_idle();
+	omap_sram_idle(false);

 restore:
 	/* Restore next_pwrsts */