[PATCH] perf: add OMAP support for the new power events
Santosh Shilimkar
santosh.shilimkar at ti.com
Fri Feb 18 13:21:38 EST 2011
Jean,
> -----Original Message-----
> From: linux-omap-owner at vger.kernel.org [mailto:linux-omap-
> owner at vger.kernel.org] On Behalf Of jean.pihet at newoldbits.com
> Sent: Friday, February 18, 2011 11:41 PM
> To: Kevin Hilman; Thomas Renninger; linux-omap at vger.kernel.org;
> linux-arm-kernel at lists.infradead.org
> Cc: Jean Pihet
> Subject: [PATCH] perf: add OMAP support for the new power events
>
> From: Jean Pihet <j-pihet at ti.com>
>
> 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),
> - 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>
Thanks for additional power domain trace point as per
discussion.
Acked-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
> ---
> arch/arm/mach-omap2/clock.c | 8 +++++++-
> arch/arm/mach-omap2/pm34xx.c | 7 +++++++
> arch/arm/mach-omap2/powerdomain.c | 26 +++++++++++++++++++++++---
> 3 files changed, 37 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-
> omap2/clock.c
> index 2a2f152..72af75d 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>
> @@ -261,6 +263,7 @@ void omap2_clk_disable(struct clk *clk)
>
> pr_debug("clock: %s: disabling in hardware\n", clk->name);
>
> + trace_clock_disable(clk->name, 0, smp_processor_id());
> clk->ops->disable(clk);
>
> if (clk->clkdm)
> @@ -312,6 +315,7 @@ int omap2_clk_enable(struct clk *clk)
> }
> }
>
> + 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", clk->name,
> ret);
> @@ -349,8 +353,10 @@ 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 2f864e4..d1cc3f4 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"
> @@ -519,8 +520,14 @@ 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;
> }
> --
> 1.7.2.3
>
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