[PATCH V4 0/3] arm64: topology: improvements

[PATCH V4 0/3] arm64: topology: improvements

[Viresh Kumar]

Hi,

Here is the V4 with the general improvements for topology stuff. This
cleans up the code and makes it work with cpufreq modules.

V4:
- Added Rby from Ionela.
- In 3/3, Print cpus instead of amu_fie_cpus and make it pr_debug
  instead.

Viresh Kumar (3):
  arm64: topology: Avoid the have_policy check
  arm64: topology: Reorder init_amu_fie() a bit
  arm64: topology: Make AMUs work with modular cpufreq drivers

 arch/arm64/kernel/topology.c | 115 +++++++++++++++++------------------
 1 file changed, 56 insertions(+), 59 deletions(-)

-- 
2.25.0.rc1.19.g042ed3e048af


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[PATCH V4 1/3] arm64: topology: Avoid the have_policy check

[Viresh Kumar]

Every time I have stumbled upon this routine, I get confused with the
way 'have_policy' is used and I have to dig in to understand why is it
so. Here is an attempt to make it easier to understand, and hopefully it
is an improvement.

The 'have_policy' check was just an optimization to avoid writing
to amu_fie_cpus in case we don't have to, but that optimization itself
is creating more confusion than the real work. Lets just do that if all
the CPUs support AMUs. It is much cleaner that way.

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 arch/arm64/kernel/topology.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index f6faa697e83e..ebadc73449f9 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -199,14 +199,14 @@ static int freq_inv_set_max_ratio(int cpu, u64 max_rate, u64 ref_rate)
 	return 0;
 }
 
-static inline bool
+static inline void
 enable_policy_freq_counters(int cpu, cpumask_var_t valid_cpus)
 {
 	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
 
 	if (!policy) {
 		pr_debug("CPU%d: No cpufreq policy found.\n", cpu);
-		return false;
+		return;
 	}
 
 	if (cpumask_subset(policy->related_cpus, valid_cpus))
@@ -214,8 +214,6 @@ enable_policy_freq_counters(int cpu, cpumask_var_t valid_cpus)
 			   amu_fie_cpus);
 
 	cpufreq_cpu_put(policy);
-
-	return true;
 }
 
 static DEFINE_STATIC_KEY_FALSE(amu_fie_key);
@@ -225,7 +223,6 @@ static int __init init_amu_fie(void)
 {
 	bool invariance_status = topology_scale_freq_invariant();
 	cpumask_var_t valid_cpus;
-	bool have_policy = false;
 	int ret = 0;
 	int cpu;
 
@@ -245,17 +242,12 @@ static int __init init_amu_fie(void)
 			continue;
 
 		cpumask_set_cpu(cpu, valid_cpus);
-		have_policy |= enable_policy_freq_counters(cpu, valid_cpus);
+		enable_policy_freq_counters(cpu, valid_cpus);
 	}
 
-	/*
-	 * If we are not restricted by cpufreq policies, we only enable
-	 * the use of the AMU feature for FIE if all CPUs support AMU.
-	 * Otherwise, enable_policy_freq_counters has already enabled
-	 * policy cpus.
-	 */
-	if (!have_policy && cpumask_equal(valid_cpus, cpu_present_mask))
-		cpumask_or(amu_fie_cpus, amu_fie_cpus, valid_cpus);
+	/* Overwrite amu_fie_cpus if all CPUs support AMU */
+	if (cpumask_equal(valid_cpus, cpu_present_mask))
+		cpumask_copy(amu_fie_cpus, cpu_present_mask);
 
 	if (!cpumask_empty(amu_fie_cpus)) {
 		pr_info("CPUs[%*pbl]: counters will be used for FIE.",
-- 
2.25.0.rc1.19.g042ed3e048af


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[PATCH V4 2/3] arm64: topology: Reorder init_amu_fie() a bit

[Viresh Kumar]

This patch does a couple of optimizations in init_amu_fie(), like early
exits from paths where we don't need to continue any further, avoid the
enable/disable dance, moving the calls to
topology_scale_freq_invariant() just when we need them, instead of at
the top of the routine, and avoiding calling it for the third time.

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 arch/arm64/kernel/topology.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index ebadc73449f9..57267d694495 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -221,8 +221,8 @@ static DEFINE_STATIC_KEY_FALSE(amu_fie_key);
 
 static int __init init_amu_fie(void)
 {
-	bool invariance_status = topology_scale_freq_invariant();
 	cpumask_var_t valid_cpus;
+	bool invariant;
 	int ret = 0;
 	int cpu;
 
@@ -249,18 +249,19 @@ static int __init init_amu_fie(void)
 	if (cpumask_equal(valid_cpus, cpu_present_mask))
 		cpumask_copy(amu_fie_cpus, cpu_present_mask);
 
-	if (!cpumask_empty(amu_fie_cpus)) {
-		pr_info("CPUs[%*pbl]: counters will be used for FIE.",
-			cpumask_pr_args(amu_fie_cpus));
-		static_branch_enable(&amu_fie_key);
-	}
+	if (cpumask_empty(amu_fie_cpus))
+		goto free_valid_mask;
 
-	/*
-	 * If the system is not fully invariant after AMU init, disable
-	 * partial use of counters for frequency invariance.
-	 */
-	if (!topology_scale_freq_invariant())
-		static_branch_disable(&amu_fie_key);
+	invariant = topology_scale_freq_invariant();
+
+	/* We aren't fully invariant yet */
+	if (!invariant && !cpumask_equal(amu_fie_cpus, cpu_present_mask))
+		goto free_valid_mask;
+
+	static_branch_enable(&amu_fie_key);
+
+	pr_info("CPUs[%*pbl]: counters will be used for FIE.",
+		cpumask_pr_args(amu_fie_cpus));
 
 	/*
 	 * Task scheduler behavior depends on frequency invariance support,
@@ -268,7 +269,7 @@ static int __init init_amu_fie(void)
 	 * a result of counter initialisation and use, retrigger the build of
 	 * scheduling domains to ensure the information is propagated properly.
 	 */
-	if (invariance_status != topology_scale_freq_invariant())
+	if (!invariant)
 		rebuild_sched_domains_energy();
 
 free_valid_mask:
-- 
2.25.0.rc1.19.g042ed3e048af


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[PATCH V4 3/3] arm64: topology: Make AMUs work with modular cpufreq drivers

[Viresh Kumar]

The AMU counters won't get used today if the cpufreq driver is built as
a module as the amu core requires everything to be ready by late init.

Fix that properly by registering for cpufreq policy notifier. Note that
the amu core don't have any cpufreq dependency after the first time
CPUFREQ_CREATE_POLICY notifier is called for all the CPUs. And so we
don't need to do anything on the CPUFREQ_REMOVE_POLICY notifier. And for
the same reason we check if the CPUs are already parsed in the beginning
of amu_fie_setup() and skip if that is true. Alternatively we can shoot
a work from there to unregister the notifier instead, but that seemed
too much instead of this simple check.

While at it, convert the print message to pr_debug instead of pr_info.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

---
 arch/arm64/kernel/topology.c | 92 +++++++++++++++++++-----------------
 1 file changed, 48 insertions(+), 44 deletions(-)

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 57267d694495..e08a4126453a 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -199,69 +199,38 @@ static int freq_inv_set_max_ratio(int cpu, u64 max_rate, u64 ref_rate)
 	return 0;
 }
 
-static inline void
-enable_policy_freq_counters(int cpu, cpumask_var_t valid_cpus)
-{
-	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
-
-	if (!policy) {
-		pr_debug("CPU%d: No cpufreq policy found.\n", cpu);
-		return;
-	}
-
-	if (cpumask_subset(policy->related_cpus, valid_cpus))
-		cpumask_or(amu_fie_cpus, policy->related_cpus,
-			   amu_fie_cpus);
-
-	cpufreq_cpu_put(policy);
-}
-
 static DEFINE_STATIC_KEY_FALSE(amu_fie_key);
 #define amu_freq_invariant() static_branch_unlikely(&amu_fie_key)
 
-static int __init init_amu_fie(void)
+static void amu_fie_setup(const struct cpumask *cpus)
 {
-	cpumask_var_t valid_cpus;
 	bool invariant;
-	int ret = 0;
 	int cpu;
 
-	if (!zalloc_cpumask_var(&valid_cpus, GFP_KERNEL))
-		return -ENOMEM;
-
-	if (!zalloc_cpumask_var(&amu_fie_cpus, GFP_KERNEL)) {
-		ret = -ENOMEM;
-		goto free_valid_mask;
-	}
+	/* We are already set since the last insmod of cpufreq driver */
+	if (unlikely(cpumask_subset(cpus, amu_fie_cpus)))
+		return;
 
-	for_each_present_cpu(cpu) {
+	for_each_cpu(cpu, cpus) {
 		if (!freq_counters_valid(cpu) ||
 		    freq_inv_set_max_ratio(cpu,
 					   cpufreq_get_hw_max_freq(cpu) * 1000,
 					   arch_timer_get_rate()))
-			continue;
-
-		cpumask_set_cpu(cpu, valid_cpus);
-		enable_policy_freq_counters(cpu, valid_cpus);
+			return;
 	}
 
-	/* Overwrite amu_fie_cpus if all CPUs support AMU */
-	if (cpumask_equal(valid_cpus, cpu_present_mask))
-		cpumask_copy(amu_fie_cpus, cpu_present_mask);
-
-	if (cpumask_empty(amu_fie_cpus))
-		goto free_valid_mask;
+	cpumask_or(amu_fie_cpus, amu_fie_cpus, cpus);
 
 	invariant = topology_scale_freq_invariant();
 
 	/* We aren't fully invariant yet */
 	if (!invariant && !cpumask_equal(amu_fie_cpus, cpu_present_mask))
-		goto free_valid_mask;
+		return;
 
 	static_branch_enable(&amu_fie_key);
 
-	pr_info("CPUs[%*pbl]: counters will be used for FIE.",
-		cpumask_pr_args(amu_fie_cpus));
+	pr_debug("CPUs[%*pbl]: counters will be used for FIE.",
+		 cpumask_pr_args(cpus));
 
 	/*
 	 * Task scheduler behavior depends on frequency invariance support,
@@ -271,13 +240,48 @@ static int __init init_amu_fie(void)
 	 */
 	if (!invariant)
 		rebuild_sched_domains_energy();
+}
+
+static int init_amu_fie_callback(struct notifier_block *nb, unsigned long val,
+				 void *data)
+{
+	struct cpufreq_policy *policy = data;
+
+	if (val == CPUFREQ_CREATE_POLICY)
+		amu_fie_setup(policy->related_cpus);
+
+	/*
+	 * We don't need to handle CPUFREQ_REMOVE_POLICY event as the AMU
+	 * counters don't have any dependency on cpufreq driver once we have
+	 * initialized AMU support and enabled invariance. The AMU counters will
+	 * keep on working just fine in the absence of the cpufreq driver, and
+	 * for the CPUs for which there are no counters available, the last set
+	 * value of freq_scale will remain valid as that is the frequency those
+	 * CPUs are running at.
+	 */
+
+	return 0;
+}
+
+static struct notifier_block init_amu_fie_notifier = {
+	.notifier_call = init_amu_fie_callback,
+};
+
+static int __init init_amu_fie(void)
+{
+	int ret;
+
+	if (!zalloc_cpumask_var(&amu_fie_cpus, GFP_KERNEL))
+		return -ENOMEM;
 
-free_valid_mask:
-	free_cpumask_var(valid_cpus);
+	ret = cpufreq_register_notifier(&init_amu_fie_notifier,
+					CPUFREQ_POLICY_NOTIFIER);
+	if (ret)
+		free_cpumask_var(amu_fie_cpus);
 
 	return ret;
 }
-late_initcall_sync(init_amu_fie);
+core_initcall(init_amu_fie);
 
 bool arch_freq_counters_available(const struct cpumask *cpus)
 {
-- 
2.25.0.rc1.19.g042ed3e048af


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Re: [PATCH V4 3/3] arm64: topology: Make AMUs work with modular cpufreq drivers

[Ionela Voinescu]

On Friday 08 Jan 2021 at 16:46:53 (+0530), Viresh Kumar wrote:
> The AMU counters won't get used today if the cpufreq driver is built as
> a module as the amu core requires everything to be ready by late init.
> 
> Fix that properly by registering for cpufreq policy notifier. Note that
> the amu core don't have any cpufreq dependency after the first time
> CPUFREQ_CREATE_POLICY notifier is called for all the CPUs. And so we
> don't need to do anything on the CPUFREQ_REMOVE_POLICY notifier. And for
> the same reason we check if the CPUs are already parsed in the beginning
> of amu_fie_setup() and skip if that is true. Alternatively we can shoot
> a work from there to unregister the notifier instead, but that seemed
> too much instead of this simple check.
> 
> While at it, convert the print message to pr_debug instead of pr_info.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> 
> ---
>  arch/arm64/kernel/topology.c | 92 +++++++++++++++++++-----------------
>  1 file changed, 48 insertions(+), 44 deletions(-)
> 
> diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
> index 57267d694495..e08a4126453a 100644
> --- a/arch/arm64/kernel/topology.c
> +++ b/arch/arm64/kernel/topology.c
> @@ -199,69 +199,38 @@ static int freq_inv_set_max_ratio(int cpu, u64 max_rate, u64 ref_rate)
>  	return 0;
>  }
>  
> -static inline void
> -enable_policy_freq_counters(int cpu, cpumask_var_t valid_cpus)
> -{
> -	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
> -
> -	if (!policy) {
> -		pr_debug("CPU%d: No cpufreq policy found.\n", cpu);
> -		return;
> -	}
> -
> -	if (cpumask_subset(policy->related_cpus, valid_cpus))
> -		cpumask_or(amu_fie_cpus, policy->related_cpus,
> -			   amu_fie_cpus);
> -
> -	cpufreq_cpu_put(policy);
> -}
> -
>  static DEFINE_STATIC_KEY_FALSE(amu_fie_key);
>  #define amu_freq_invariant() static_branch_unlikely(&amu_fie_key)
>  
> -static int __init init_amu_fie(void)
> +static void amu_fie_setup(const struct cpumask *cpus)
>  {
> -	cpumask_var_t valid_cpus;
>  	bool invariant;
> -	int ret = 0;
>  	int cpu;
>  
> -	if (!zalloc_cpumask_var(&valid_cpus, GFP_KERNEL))
> -		return -ENOMEM;
> -
> -	if (!zalloc_cpumask_var(&amu_fie_cpus, GFP_KERNEL)) {
> -		ret = -ENOMEM;
> -		goto free_valid_mask;
> -	}
> +	/* We are already set since the last insmod of cpufreq driver */
> +	if (unlikely(cpumask_subset(cpus, amu_fie_cpus)))
> +		return;
>  
> -	for_each_present_cpu(cpu) {
> +	for_each_cpu(cpu, cpus) {
>  		if (!freq_counters_valid(cpu) ||
>  		    freq_inv_set_max_ratio(cpu,
>  					   cpufreq_get_hw_max_freq(cpu) * 1000,
>  					   arch_timer_get_rate()))
> -			continue;
> -
> -		cpumask_set_cpu(cpu, valid_cpus);
> -		enable_policy_freq_counters(cpu, valid_cpus);
> +			return;
>  	}
>  
> -	/* Overwrite amu_fie_cpus if all CPUs support AMU */
> -	if (cpumask_equal(valid_cpus, cpu_present_mask))
> -		cpumask_copy(amu_fie_cpus, cpu_present_mask);
> -
> -	if (cpumask_empty(amu_fie_cpus))
> -		goto free_valid_mask;
> +	cpumask_or(amu_fie_cpus, amu_fie_cpus, cpus);
>  
>  	invariant = topology_scale_freq_invariant();
>  
>  	/* We aren't fully invariant yet */
>  	if (!invariant && !cpumask_equal(amu_fie_cpus, cpu_present_mask))
> -		goto free_valid_mask;
> +		return;
>  
>  	static_branch_enable(&amu_fie_key);
>  
> -	pr_info("CPUs[%*pbl]: counters will be used for FIE.",
> -		cpumask_pr_args(amu_fie_cpus));
> +	pr_debug("CPUs[%*pbl]: counters will be used for FIE.",
> +		 cpumask_pr_args(cpus));
>  
>  	/*
>  	 * Task scheduler behavior depends on frequency invariance support,
> @@ -271,13 +240,48 @@ static int __init init_amu_fie(void)
>  	 */
>  	if (!invariant)
>  		rebuild_sched_domains_energy();
> +}
> +
> +static int init_amu_fie_callback(struct notifier_block *nb, unsigned long val,
> +				 void *data)
> +{
> +	struct cpufreq_policy *policy = data;
> +
> +	if (val == CPUFREQ_CREATE_POLICY)
> +		amu_fie_setup(policy->related_cpus);
> +
> +	/*
> +	 * We don't need to handle CPUFREQ_REMOVE_POLICY event as the AMU
> +	 * counters don't have any dependency on cpufreq driver once we have
> +	 * initialized AMU support and enabled invariance. The AMU counters will
> +	 * keep on working just fine in the absence of the cpufreq driver, and
> +	 * for the CPUs for which there are no counters available, the last set
> +	 * value of freq_scale will remain valid as that is the frequency those
> +	 * CPUs are running at.
> +	 */
> +
> +	return 0;
> +}
> +
> +static struct notifier_block init_amu_fie_notifier = {
> +	.notifier_call = init_amu_fie_callback,
> +};
> +
> +static int __init init_amu_fie(void)
> +{
> +	int ret;
> +
> +	if (!zalloc_cpumask_var(&amu_fie_cpus, GFP_KERNEL))
> +		return -ENOMEM;
>  
> -free_valid_mask:
> -	free_cpumask_var(valid_cpus);
> +	ret = cpufreq_register_notifier(&init_amu_fie_notifier,
> +					CPUFREQ_POLICY_NOTIFIER);
> +	if (ret)
> +		free_cpumask_var(amu_fie_cpus);
>  
>  	return ret;
>  }
> -late_initcall_sync(init_amu_fie);
> +core_initcall(init_amu_fie);
>  
>  bool arch_freq_counters_available(const struct cpumask *cpus)
>  {
> -- 
> 2.25.0.rc1.19.g042ed3e048af
> 

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>

Thanks,
Ionela.

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Re: [PATCH V4 0/3] arm64: topology: improvements

[Ionela Voinescu]

On Friday 08 Jan 2021 at 16:46:50 (+0530), Viresh Kumar wrote:
> Hi,
> 
> Here is the V4 with the general improvements for topology stuff. This
> cleans up the code and makes it work with cpufreq modules.
> 
> V4:
> - Added Rby from Ionela.
> - In 3/3, Print cpus instead of amu_fie_cpus and make it pr_debug
>   instead.
> 
> Viresh Kumar (3):
>   arm64: topology: Avoid the have_policy check
>   arm64: topology: Reorder init_amu_fie() a bit
>   arm64: topology: Make AMUs work with modular cpufreq drivers
> 
>  arch/arm64/kernel/topology.c | 115 +++++++++++++++++------------------
>  1 file changed, 56 insertions(+), 59 deletions(-)
> 

Tested-by: Ionela Voinescu <ionela.voinescu@arm.com>

..for the full set.

Thanks,
Ionela.

> -- 
> 2.25.0.rc1.19.g042ed3e048af
> 

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Re: [PATCH V4 0/3] arm64: topology: improvements

[Viresh Kumar]

On 08-01-21, 15:53, Ionela Voinescu wrote:
> On Friday 08 Jan 2021 at 16:46:50 (+0530), Viresh Kumar wrote:
> > Hi,
> > 
> > Here is the V4 with the general improvements for topology stuff. This
> > cleans up the code and makes it work with cpufreq modules.
> > 
> > V4:
> > - Added Rby from Ionela.
> > - In 3/3, Print cpus instead of amu_fie_cpus and make it pr_debug
> >   instead.
> > 
> > Viresh Kumar (3):
> >   arm64: topology: Avoid the have_policy check
> >   arm64: topology: Reorder init_amu_fie() a bit
> >   arm64: topology: Make AMUs work with modular cpufreq drivers
> > 
> >  arch/arm64/kernel/topology.c | 115 +++++++++++++++++------------------
> >  1 file changed, 56 insertions(+), 59 deletions(-)
> > 
> 
> Tested-by: Ionela Voinescu <ionela.voinescu@arm.com>
> 
> ..for the full set.

Thanks, Ionela.

-- 
viresh

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Re: [PATCH V4 0/3] arm64: topology: improvements

[Viresh Kumar]

On 08-01-21, 16:46, Viresh Kumar wrote:
> Hi,
> 
> Here is the V4 with the general improvements for topology stuff. This
> cleans up the code and makes it work with cpufreq modules.
> 
> V4:
> - Added Rby from Ionela.
> - In 3/3, Print cpus instead of amu_fie_cpus and make it pr_debug
>   instead.
> 
> Viresh Kumar (3):
>   arm64: topology: Avoid the have_policy check
>   arm64: topology: Reorder init_amu_fie() a bit
>   arm64: topology: Make AMUs work with modular cpufreq drivers
> 
>  arch/arm64/kernel/topology.c | 115 +++++++++++++++++------------------
>  1 file changed, 56 insertions(+), 59 deletions(-)

Catalin,

Can you please push this series for 5.12? Thanks.

-- 
viresh

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Re: [PATCH V4 0/3] arm64: topology: improvements

[Will Deacon]

On Fri, 8 Jan 2021 16:46:50 +0530, Viresh Kumar wrote:
> Here is the V4 with the general improvements for topology stuff. This
> cleans up the code and makes it work with cpufreq modules.
> 
> V4:
> - Added Rby from Ionela.
> - In 3/3, Print cpus instead of amu_fie_cpus and make it pr_debug
>   instead.
> 
> [...]

Applied to arm64 (for-next/topology), thanks!

[1/3] arm64: topology: Avoid the have_policy check
      https://git.kernel.org/arm64/c/384e5699e101
[2/3] arm64: topology: Reorder init_amu_fie() a bit
      https://git.kernel.org/arm64/c/47b10b737c07
[3/3] arm64: topology: Make AMUs work with modular cpufreq drivers
      https://git.kernel.org/arm64/c/a5f1b187cd24

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev

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