[PATCH] perf: add OMAP support for the new power events

[Kevin Hilman]

Jean Pihet <jean.pihet at newoldbits.com> writes:

> The patch adds the new power management trace points for
> the OMAP architecture.
>
> The trace points are for:
> - default idle handler. Since the cpuidle framework is
>   instrumented in the generic way there is no need to
>   add trace points in the OMAP specific cpuidle handler;
> - cpufreq (DVFS),

Minor: AFAICT, this patch doesn't instrument CPUfreq.

> - SoC clocks changes (enable, disable, set_rate),
> - power domain states: the desired target state and -if different-
>   the actually hit state.
>
> Because of the generic nature of the changes, OMAP3 and OMAP4 are supported.
>
> Tested on OMAP3 with suspend/resume, cpuidle, basic DVFS.
>
> Signed-off-by: Jean Pihet <j-pihet at ti.com>

With Paul's ack on the powerdomain changes, I'll queue this for 2.6.39
after making the above change in the changelog.

Kevin


> ---
>  arch/arm/mach-omap2/clock.c       |   11 +++++++++--
>  arch/arm/mach-omap2/pm34xx.c      |    7 +++++++
>  arch/arm/mach-omap2/powerdomain.c |   26 +++++++++++++++++++++++---
>  3 files changed, 39 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
> index 46d03cc..180299e 100644
> --- a/arch/arm/mach-omap2/clock.c
> +++ b/arch/arm/mach-omap2/clock.c
> @@ -22,7 +22,9 @@
>  #include <linux/clk.h>
>  #include <linux/io.h>
>  #include <linux/bitops.h>
> +#include <trace/events/power.h>
>  
> +#include <asm/cpu.h>
>  #include <plat/clock.h>
>  #include "clockdomain.h"
>  #include <plat/cpu.h>
> @@ -261,8 +263,10 @@ void omap2_clk_disable(struct clk *clk)
>  
>  	pr_debug("clock: %s: disabling in hardware\n", clk->name);
>  
> -	if (clk->ops && clk->ops->disable)
> +	if (clk->ops && clk->ops->disable) {
> +		trace_clock_disable(clk->name, 0, smp_processor_id());
>  		clk->ops->disable(clk);
> +	}
>  
>  	if (clk->clkdm)
>  		clkdm_clk_disable(clk->clkdm, clk);
> @@ -314,6 +318,7 @@ int omap2_clk_enable(struct clk *clk)
>  	}
>  
>  	if (clk->ops && clk->ops->enable) {
> +		trace_clock_enable(clk->name, 1, smp_processor_id());
>  		ret = clk->ops->enable(clk);
>  		if (ret) {
>  			WARN(1, "clock: %s: could not enable: %d\n",
> @@ -353,8 +358,10 @@ int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
>  	pr_debug("clock: set_rate for clock %s to rate %ld\n", clk->name, rate);
>  
>  	/* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
> -	if (clk->set_rate)
> +	if (clk->set_rate) {
> +		trace_clock_set_rate(clk->name, rate, smp_processor_id());
>  		ret = clk->set_rate(clk, rate);
> +	}
>  
>  	return ret;
>  }
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index bd610bc..d46b9ff 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -29,6 +29,7 @@
>  #include <linux/delay.h>
>  #include <linux/slab.h>
>  #include <linux/console.h>
> +#include <trace/events/power.h>
>  
>  #include <plat/sram.h>
>  #include "clockdomain.h"
> @@ -514,8 +515,14 @@ static void omap3_pm_idle(void)
>  	if (omap_irq_pending() || need_resched())
>  		goto out;
>  
> +	trace_power_start(POWER_CSTATE, 1, smp_processor_id());
> +	trace_cpu_idle(1, smp_processor_id());
> +
>  	omap_sram_idle();
>  
> +	trace_power_end(smp_processor_id());
> +	trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
> +
>  out:
>  	local_fiq_enable();
>  	local_irq_enable();
> diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
> index eaed0df..1495eed 100644
> --- a/arch/arm/mach-omap2/powerdomain.c
> +++ b/arch/arm/mach-omap2/powerdomain.c
> @@ -19,12 +19,15 @@
>  #include <linux/list.h>
>  #include <linux/errno.h>
>  #include <linux/string.h>
> +#include <trace/events/power.h>
> +
>  #include "cm2xxx_3xxx.h"
>  #include "prcm44xx.h"
>  #include "cm44xx.h"
>  #include "prm2xxx_3xxx.h"
>  #include "prm44xx.h"
>  
> +#include <asm/cpu.h>
>  #include <plat/cpu.h>
>  #include "powerdomain.h"
>  #include "clockdomain.h"
> @@ -32,6 +35,8 @@
>  
>  #include "pm.h"
>  
> +#define PWRDM_TRACE_STATES_FLAG	(1<<31)
> +
>  enum {
>  	PWRDM_STATE_NOW = 0,
>  	PWRDM_STATE_PREV,
> @@ -130,8 +135,7 @@ static void _update_logic_membank_counters(struct powerdomain *pwrdm)
>  static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
>  {
>  
> -	int prev;
> -	int state;
> +	int prev, state, trace_state = 0;
>  
>  	if (pwrdm == NULL)
>  		return -EINVAL;
> @@ -148,6 +152,17 @@ static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
>  			pwrdm->state_counter[prev]++;
>  		if (prev == PWRDM_POWER_RET)
>  			_update_logic_membank_counters(pwrdm);
> +		/*
> +		 * If the power domain did not hit the desired state,
> +		 * generate a trace event with both the desired and hit states
> +		 */
> +		if (state != prev) {
> +			trace_state = (PWRDM_TRACE_STATES_FLAG |
> +				       ((state & OMAP_POWERSTATE_MASK) << 8) |
> +				       ((prev & OMAP_POWERSTATE_MASK) << 0));
> +			trace_power_domain_target(pwrdm->name, trace_state,
> +						  smp_processor_id());
> +		}
>  		break;
>  	default:
>  		return -EINVAL;
> @@ -406,8 +421,13 @@ int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
>  	pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
>  		 pwrdm->name, pwrst);
>  
> -	if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst)
> +	if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
> +		/* Trace the pwrdm desired target state */
> +		trace_power_domain_target(pwrdm->name, pwrst,
> +					  smp_processor_id());
> +		/* Program the pwrdm desired target state */
>  		ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
> +	}
>  
>  	return ret;
>  }