Re: [PATCH v4 02/11] perf/x86/rapl: Fix the energy-pkg event for AMD CPUs

[Dhananjay Ugwekar]

Hello Peter, Rui,

After Ian's comments on the series, I have decided to rethink the approach of
adding a new PMU for the per-core RAPL counters.

However this patch is still needed as a fix for the 
commit ("x86/cpu/topology: Add support for the AMD 0x80000026 leaf"), I will be
sending this separately along with a similar fix for powercap/intel_rapl_common.

Thanks,
Dhananjay

On 7/11/2024 3:54 PM, Dhananjay Ugwekar wrote:
> After commit ("x86/cpu/topology: Add support for the AMD 0x80000026 leaf"),
> on AMD processors that support extended CPUID leaf 0x80000026, the
> topology_die_cpumask() and topology_logical_die_id() macros, no longer
> return the package cpumask and package id, instead they return the CCD
> (Core Complex Die) mask and id respectively. This leads to the energy-pkg
> event scope to be modified to CCD instead of package.
> 
> Replacing these macros with their package counterparts fixes the
> energy-pkg event for AMD CPUs.
> 
> However due to the difference between the scope of energy-pkg event for
> Intel and AMD CPUs, we have to replace these macros conditionally only for
> AMD CPUs.
> 
> On a 12 CCD 1 Package AMD Zen4 Genoa machine:
> 
> Before:
> $ cat /sys/devices/power/cpumask
> 0,8,16,24,32,40,48,56,64,72,80,88.
> 
> The expected cpumask here is supposed to be just "0", as it is a package
> scope event, only one CPU will be collecting the event for all the CPUs in
> the package.
> 
> After:
> $ cat /sys/devices/power/cpumask
> 0
> 
> Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@xxxxxxx>
> Fixes: 63edbaa48a57 ("x86/cpu/topology: Add support for the AMD 0x80000026 leaf")
> ---
> Changes in v4:
> * Invert the pkg scope check in init_rapl_pmus() (Peter)
> * Add comments to explain the pkg scope check (Peter)
> 
> PS: Scope check logic is still kept the same (i.e., all Intel systems being 
> considered as die scope), Rui will be modifying it to limit the die-scope 
> only to Cascadelake-AP in a future patch on top of this patchset.
> ---
>  arch/x86/events/rapl.c | 39 ++++++++++++++++++++++++++++++++++-----
>  1 file changed, 34 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
> index 0c5e7a7c43ac..df71f38ad98d 100644
> --- a/arch/x86/events/rapl.c
> +++ b/arch/x86/events/rapl.c
> @@ -103,6 +103,13 @@ static struct perf_pmu_events_attr event_attr_##v = {				\
>  	.event_str	= str,							\
>  };
>  
> +/*
> + * RAPL PMU scope for AMD is package whereas for Intel it is die.
> + */
> +#define rapl_pmu_is_pkg_scope()				\
> +	(boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||	\
> +	 boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
> +
>  struct rapl_pmu {
>  	raw_spinlock_t		lock;
>  	int			n_active;
> @@ -140,9 +147,25 @@ static unsigned int rapl_cntr_mask;
>  static u64 rapl_timer_ms;
>  static struct perf_msr *rapl_msrs;
>  
> +/*
> + * Helper functions to get the correct topology macros according to the
> + * RAPL PMU scope.
> + */
> +static inline unsigned int get_rapl_pmu_idx(int cpu)
> +{
> +	return rapl_pmu_is_pkg_scope() ? topology_logical_package_id(cpu) :
> +					 topology_logical_die_id(cpu);
> +}
> +
> +static inline const struct cpumask *get_rapl_pmu_cpumask(int cpu)
> +{
> +	return rapl_pmu_is_pkg_scope() ? topology_core_cpumask(cpu) :
> +					 topology_die_cpumask(cpu);
> +}
> +
>  static inline struct rapl_pmu *cpu_to_rapl_pmu(unsigned int cpu)
>  {
> -	unsigned int rapl_pmu_idx = topology_logical_die_id(cpu);
> +	unsigned int rapl_pmu_idx = get_rapl_pmu_idx(cpu);
>  
>  	/*
>  	 * The unsigned check also catches the '-1' return value for non
> @@ -543,6 +566,7 @@ static struct perf_msr amd_rapl_msrs[] = {
>  
>  static int rapl_cpu_offline(unsigned int cpu)
>  {
> +	const struct cpumask *rapl_pmu_cpumask = get_rapl_pmu_cpumask(cpu);
>  	struct rapl_pmu *pmu = cpu_to_rapl_pmu(cpu);
>  	int target;
>  
> @@ -552,7 +576,7 @@ static int rapl_cpu_offline(unsigned int cpu)
>  
>  	pmu->cpu = -1;
>  	/* Find a new cpu to collect rapl events */
> -	target = cpumask_any_but(topology_die_cpumask(cpu), cpu);
> +	target = cpumask_any_but(rapl_pmu_cpumask, cpu);
>  
>  	/* Migrate rapl events to the new target */
>  	if (target < nr_cpu_ids) {
> @@ -565,6 +589,8 @@ static int rapl_cpu_offline(unsigned int cpu)
>  
>  static int rapl_cpu_online(unsigned int cpu)
>  {
> +	unsigned int rapl_pmu_idx = get_rapl_pmu_idx(cpu);
> +	const struct cpumask *rapl_pmu_cpumask = get_rapl_pmu_cpumask(cpu);
>  	struct rapl_pmu *pmu = cpu_to_rapl_pmu(cpu);
>  	int target;
>  
> @@ -579,14 +605,14 @@ static int rapl_cpu_online(unsigned int cpu)
>  		pmu->timer_interval = ms_to_ktime(rapl_timer_ms);
>  		rapl_hrtimer_init(pmu);
>  
> -		rapl_pmus->pmus[topology_logical_die_id(cpu)] = pmu;
> +		rapl_pmus->pmus[rapl_pmu_idx] = pmu;
>  	}
>  
>  	/*
>  	 * Check if there is an online cpu in the package which collects rapl
>  	 * events already.
>  	 */
> -	target = cpumask_any_and(&rapl_cpu_mask, topology_die_cpumask(cpu));
> +	target = cpumask_any_and(&rapl_cpu_mask, rapl_pmu_cpumask);
>  	if (target < nr_cpu_ids)
>  		return 0;
>  
> @@ -675,7 +701,10 @@ static const struct attribute_group *rapl_attr_update[] = {
>  
>  static int __init init_rapl_pmus(void)
>  {
> -	int nr_rapl_pmu = topology_max_packages() * topology_max_dies_per_package();
> +	int nr_rapl_pmu = topology_max_packages();
> +
> +	if (!rapl_pmu_is_pkg_scope())
> +		nr_rapl_pmu *= topology_max_dies_per_package();
>  
>  	rapl_pmus = kzalloc(struct_size(rapl_pmus, pmus, nr_rapl_pmu), GFP_KERNEL);
>  	if (!rapl_pmus)