[PATCH 0/2] change lpj in arm smp common code

[PATCH 0/2] change lpj in arm smp common code

[Richard Zhao]

The two patches were originally in [PATCH V6 0/7] add a generic cpufreq driver.
I seperated them and hope they can go to upstream earlier.

Richard Zhao (2):
  ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp
  cpufreq: OMAP: remove loops_per_jiffy recalculate for smp

 arch/arm/kernel/smp.c          |   54 ++++++++++++++++++++++++++++++++++++++++
 drivers/cpufreq/omap-cpufreq.c |   36 --------------------------
 2 files changed, 54 insertions(+), 36 deletions(-)

-- 
1.7.5.4

[PATCH 1/2] ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp

[Richard Zhao]

If CONFIG_SMP, cpufreq skips loops_per_jiffy update, because different
arch has different per-cpu loops_per_jiffy definition.

Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/kernel/smp.c |   54 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index cdeb727..4381bef 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -25,6 +25,7 @@
 #include <linux/percpu.h>
 #include <linux/clockchips.h>
 #include <linux/completion.h>
+#include <linux/cpufreq.h>
 
 #include <linux/atomic.h>
 #include <asm/cacheflush.h>
@@ -599,3 +600,56 @@ int setup_profiling_timer(unsigned int multiplier)
 {
 	return -EINVAL;
 }
+
+#ifdef CONFIG_CPU_FREQ
+
+static DEFINE_PER_CPU(unsigned long, l_p_j_ref);
+static DEFINE_PER_CPU(unsigned long, l_p_j_ref_freq);
+static unsigned long global_l_p_j_ref;
+static unsigned long global_l_p_j_ref_freq;
+
+static int cpufreq_callback(struct notifier_block *nb,
+					unsigned long val, void *data)
+{
+	struct cpufreq_freqs *freq = data;
+	int cpu = freq->cpu;
+
+	if (freq->flags & CPUFREQ_CONST_LOOPS)
+		return NOTIFY_OK;
+
+	if (!per_cpu(l_p_j_ref, cpu)) {
+		per_cpu(l_p_j_ref, cpu) =
+			per_cpu(cpu_data, cpu).loops_per_jiffy;
+		per_cpu(l_p_j_ref_freq, cpu) = freq->old;
+		if (!global_l_p_j_ref) {
+			global_l_p_j_ref = loops_per_jiffy;
+			global_l_p_j_ref_freq = freq->old;
+		}
+	}
+
+	if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
+	    (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
+	    (val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) {
+		loops_per_jiffy = cpufreq_scale(global_l_p_j_ref,
+						global_l_p_j_ref_freq,
+						freq->new);
+		per_cpu(cpu_data, cpu).loops_per_jiffy =
+			cpufreq_scale(per_cpu(l_p_j_ref, cpu),
+					per_cpu(l_p_j_ref_freq, cpu),
+					freq->new);
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block cpufreq_notifier = {
+	.notifier_call  = cpufreq_callback,
+};
+
+static int __init register_cpufreq_notifier(void)
+{
+	return cpufreq_register_notifier(&cpufreq_notifier,
+						CPUFREQ_TRANSITION_NOTIFIER);
+}
+core_initcall(register_cpufreq_notifier);
+
+#endif
-- 
1.7.5.4

[PATCH 1/2] ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp

[Shilimkar, Santosh]

On Wed, Feb 29, 2012 at 12:48 PM, Richard Zhao <richard.zhao@linaro.org> wrote:
> If CONFIG_SMP, cpufreq skips loops_per_jiffy update, because different
> arch has different per-cpu loops_per_jiffy definition.
>
> Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
> ---
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

[PATCH 2/2] cpufreq: OMAP: remove loops_per_jiffy recalculate for smp

[Richard Zhao]

arm registered cpufreq transition notifier to recalculate it.

Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
---
 drivers/cpufreq/omap-cpufreq.c |   36 ------------------------------------
 1 files changed, 0 insertions(+), 36 deletions(-)

diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c
index 5d04c57..17da4c4 100644
--- a/drivers/cpufreq/omap-cpufreq.c
+++ b/drivers/cpufreq/omap-cpufreq.c
@@ -37,16 +37,6 @@
 
 #include <mach/hardware.h>
 
-#ifdef CONFIG_SMP
-struct lpj_info {
-	unsigned long	ref;
-	unsigned int	freq;
-};
-
-static DEFINE_PER_CPU(struct lpj_info, lpj_ref);
-static struct lpj_info global_lpj_ref;
-#endif
-
 static struct cpufreq_frequency_table *freq_table;
 static atomic_t freq_table_users = ATOMIC_INIT(0);
 static struct clk *mpu_clk;
@@ -118,32 +108,6 @@ static int omap_target(struct cpufreq_policy *policy,
 	ret = clk_set_rate(mpu_clk, freqs.new * 1000);
 	freqs.new = omap_getspeed(policy->cpu);
 
-#ifdef CONFIG_SMP
-	/*
-	 * Note that loops_per_jiffy is not updated on SMP systems in
-	 * cpufreq driver. So, update the per-CPU loops_per_jiffy value
-	 * on frequency transition. We need to update all dependent CPUs.
-	 */
-	for_each_cpu(i, policy->cpus) {
-		struct lpj_info *lpj = &per_cpu(lpj_ref, i);
-		if (!lpj->freq) {
-			lpj->ref = per_cpu(cpu_data, i).loops_per_jiffy;
-			lpj->freq = freqs.old;
-		}
-
-		per_cpu(cpu_data, i).loops_per_jiffy =
-			cpufreq_scale(lpj->ref, lpj->freq, freqs.new);
-	}
-
-	/* And don't forget to adjust the global one */
-	if (!global_lpj_ref.freq) {
-		global_lpj_ref.ref = loops_per_jiffy;
-		global_lpj_ref.freq = freqs.old;
-	}
-	loops_per_jiffy = cpufreq_scale(global_lpj_ref.ref, global_lpj_ref.freq,
-					freqs.new);
-#endif
-
 	/* notifiers */
 	for_each_cpu(i, policy->cpus) {
 		freqs.cpu = i;
-- 
1.7.5.4

[PATCH 2/2] cpufreq: OMAP: remove loops_per_jiffy recalculate for smp

[Shilimkar, Santosh]

On Wed, Feb 29, 2012 at 12:48 PM, Richard Zhao <richard.zhao@linaro.org> wrote:
> arm registered cpufreq transition notifier to recalculate it.
>
> Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
> ---
Thanks for the OMAP updates
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

[PATCH 0/2] change lpj in arm smp common code

[Kevin Hilman]

Richard Zhao <richard.zhao@linaro.org> writes:

> The two patches were originally in [PATCH V6 0/7] add a generic cpufreq driver.
> I seperated them and hope they can go to upstream earlier.
>
> Richard Zhao (2):
>   ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp
>   cpufreq: OMAP: remove loops_per_jiffy recalculate for smp

The first one should go into Russell's patch system.  Once he queues
that, I can queue the OMAP one for the CPUfreq maintainer.

Kevin

[PATCH 0/2] change lpj in arm smp common code

[Richard Zhao]

On Wed, Feb 29, 2012 at 10:21:19AM -0800, Kevin Hilman wrote:
> Richard Zhao <richard.zhao@linaro.org> writes:
> 
> > The two patches were originally in [PATCH V6 0/7] add a generic cpufreq driver.
> > I seperated them and hope they can go to upstream earlier.
> >
> > Richard Zhao (2):
> >   ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp
> >   cpufreq: OMAP: remove loops_per_jiffy recalculate for smp
> 
> The first one should go into Russell's patch system.  Once he queues
> that, I can queue the OMAP one for the CPUfreq maintainer.
Hi Russel & Kevin,

Could you double check whether you've picked the patch searies?
I can not find them in 3.4rc.

Thanks
Richard
> 
> Kevin
> 
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