diff mbox series

[34/36] cpuidle,omap3: Push RCU-idle into omap_sram_idle()

Message ID 20220608144518.073801916@infradead.org
State Superseded
Headers show
Series cpuidle,rcu: Cleanup the mess | expand

Commit Message

Peter Zijlstra June 8, 2022, 2:27 p.m. UTC 
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@infradead.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(-)

Comments

Peter Zijlstra June 8, 2022, 3:04 p.m. UTC | #1 
On Wed, Jun 08, 2022 at 04:27:57PM +0200, Peter Zijlstra wrote:
> @@ -254,11 +255,18 @@ void omap_sram_idle(void)
>  	 */
>  	if (save_state)
>  		omap34xx_save_context(omap3_arm_context);
> +
> +	if (rcuidle)
> +		cpuidle_rcu_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)
> +		rcuidle_rcu_exit();

*sigh* so much for this having been exposed to the robots for >2 days :/
Tony Lindgren June 13, 2022, 12:35 p.m. UTC | #2 
* Peter Zijlstra <peterz@infradead.org> [220608 15:00]:
> On Wed, Jun 08, 2022 at 04:27:57PM +0200, Peter Zijlstra wrote:
> > @@ -254,11 +255,18 @@ void omap_sram_idle(void)
> >  	 */
> >  	if (save_state)
> >  		omap34xx_save_context(omap3_arm_context);
> > +
> > +	if (rcuidle)
> > +		cpuidle_rcu_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)
> > +		rcuidle_rcu_exit();
> 
> *sigh* so much for this having been exposed to the robots for >2 days :/

I tested your git branch of these patches, so:

Reviewed-by: Tony Lindgren <tony@atomide.com>
Tested-by: Tony Lindgren <tony@atomide.com>
diff mbox series

Patch

--- 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 */
-	cpuidle_rcu_enter();
-	omap_sram_idle();
-	cpuidle_rcu_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)
+		cpuidle_rcu_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)
+		rcuidle_rcu_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 */