diff mbox series

[v2,09/44] cpuidle,omap3: Push RCU-idle into driver

Message ID 20220919101520.936337959@infradead.org
State Superseded
Headers show
Series cpuidle,rcu: Clean up the mess | expand

Commit Message

Peter Zijlstra Sept. 19, 2022, 9:59 a.m. UTC 
Doing RCU-idle outside the driver, only to then teporarily enable it
again 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/cpuidle34xx.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Comments

Frederic Weisbecker Sept. 19, 2022, 2:31 p.m. UTC | #1 
On Mon, Sep 19, 2022 at 11:59:48AM +0200, Peter Zijlstra wrote:
> Doing RCU-idle outside the driver, only to then teporarily enable it
> again before going idle is daft.

That doesn't tell where those calls are.

Thanks.
Frederic Weisbecker Sept. 19, 2022, 2:43 p.m. UTC | #2 
On Mon, Sep 19, 2022 at 11:59:48AM +0200, Peter Zijlstra wrote:
> Doing RCU-idle outside the driver, only to then teporarily enable it
> again 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>

Ok now with the cpu_pm_*() informations that makes sense:

Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Peter Zijlstra Sept. 19, 2022, 3:19 p.m. UTC | #3 
On Mon, Sep 19, 2022 at 04:31:42PM +0200, Frederic Weisbecker wrote:
> On Mon, Sep 19, 2022 at 11:59:48AM +0200, Peter Zijlstra wrote:
> > Doing RCU-idle outside the driver, only to then teporarily enable it
> > again before going idle is daft.
> 
> That doesn't tell where those calls are.

cpu_pm_enter/exit and the power domain stuff, possibly also the clock
domain stuff. It's all over :/

I suppose I can add a blub and copy/paste it around the various patches
if you want.
Frederic Weisbecker Sept. 20, 2022, 8:39 a.m. UTC | #4 
On Mon, Sep 19, 2022 at 05:19:05PM +0200, Peter Zijlstra wrote:
> On Mon, Sep 19, 2022 at 04:31:42PM +0200, Frederic Weisbecker wrote:
> > On Mon, Sep 19, 2022 at 11:59:48AM +0200, Peter Zijlstra wrote:
> > > Doing RCU-idle outside the driver, only to then teporarily enable it
> > > again before going idle is daft.
> > 
> > That doesn't tell where those calls are.
> 
> cpu_pm_enter/exit and the power domain stuff, possibly also the clock
> domain stuff. It's all over :/
> 
> I suppose I can add a blub and copy/paste it around the various patches
> if you want.

Yes please, sorry I don't want to bother but, just for the sake of
git blame to report something useful in 5 years.

Thanks.
diff mbox series

Patch

--- a/arch/arm/mach-omap2/cpuidle34xx.c
+++ b/arch/arm/mach-omap2/cpuidle34xx.c
@@ -133,7 +133,9 @@  static int omap3_enter_idle(struct cpuid
 	}
 
 	/* Execute ARM wfi */
+	ct_idle_enter();
 	omap_sram_idle();
+	ct_idle_exit();
 
 	/*
 	 * Call idle CPU PM enter notifier chain to restore
@@ -265,6 +267,7 @@  static struct cpuidle_driver omap3_idle_
 	.owner            = THIS_MODULE,
 	.states = {
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 2 + 2,
 			.target_residency = 5,
@@ -272,6 +275,7 @@  static struct cpuidle_driver omap3_idle_
 			.desc		  = "MPU ON + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 10 + 10,
 			.target_residency = 30,
@@ -279,6 +283,7 @@  static struct cpuidle_driver omap3_idle_
 			.desc		  = "MPU ON + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 50 + 50,
 			.target_residency = 300,
@@ -286,6 +291,7 @@  static struct cpuidle_driver omap3_idle_
 			.desc		  = "MPU RET + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 1500 + 1800,
 			.target_residency = 4000,
@@ -293,6 +299,7 @@  static struct cpuidle_driver omap3_idle_
 			.desc		  = "MPU OFF + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 2500 + 7500,
 			.target_residency = 12000,
@@ -300,6 +307,7 @@  static struct cpuidle_driver omap3_idle_
 			.desc		  = "MPU RET + CORE RET",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 3000 + 8500,
 			.target_residency = 15000,
@@ -307,6 +315,7 @@  static struct cpuidle_driver omap3_idle_
 			.desc		  = "MPU OFF + CORE RET",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 10000 + 30000,
 			.target_residency = 30000,
@@ -328,6 +337,7 @@  static struct cpuidle_driver omap3430_id
 	.owner            = THIS_MODULE,
 	.states = {
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 110 + 162,
 			.target_residency = 5,
@@ -335,6 +345,7 @@  static struct cpuidle_driver omap3430_id
 			.desc		  = "MPU ON + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 106 + 180,
 			.target_residency = 309,
@@ -342,6 +353,7 @@  static struct cpuidle_driver omap3430_id
 			.desc		  = "MPU ON + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 107 + 410,
 			.target_residency = 46057,
@@ -349,6 +361,7 @@  static struct cpuidle_driver omap3430_id
 			.desc		  = "MPU RET + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 121 + 3374,
 			.target_residency = 46057,
@@ -356,6 +369,7 @@  static struct cpuidle_driver omap3430_id
 			.desc		  = "MPU OFF + CORE ON",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 855 + 1146,
 			.target_residency = 46057,
@@ -363,6 +377,7 @@  static struct cpuidle_driver omap3430_id
 			.desc		  = "MPU RET + CORE RET",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 7580 + 4134,
 			.target_residency = 484329,
@@ -370,6 +385,7 @@  static struct cpuidle_driver omap3430_id
 			.desc		  = "MPU OFF + CORE RET",
 		},
 		{
+			.flags		  = CPUIDLE_FLAG_RCU_IDLE,
 			.enter		  = omap3_enter_idle_bm,
 			.exit_latency	  = 7505 + 15274,
 			.target_residency = 484329,