The following commit has been merged into the perf/urgent branch of tip:
Commit-ID: 8d72eba1cf8cecd76a2b4c1dd7673c2dc775f514
Gitweb: https://git.kernel.org/tip/8d72eba1cf8cecd76a2b4c1dd7673c2dc775f514
Author: Dhananjay Ugwekar <Dhananjay.Ugwekar@xxxxxxx>
AuthorDate: Tue, 30 Jul 2024 04:49:18
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Thu, 05 Sep 2024 12:02:14 +02:00
perf/x86/rapl: Fix the energy-pkg event for AMD CPUs
After commit:
63edbaa48a57 ("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.
So, change the PMU scope for AMD and Hygon back to package.
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
[ mingo: Cleaned up the changelog ]
Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@xxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240904100934.3260-1-Dhananjay.Ugwekar@xxxxxxx
---
arch/x86/events/rapl.c | 47 ++++++++++++++++++++++++++++++++++++-----
1 file changed, 42 insertions(+), 5 deletions(-)
diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index b985ca7..a481a93 100644
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -103,6 +103,19 @@ static struct perf_pmu_events_attr event_attr_##v = { \
.event_str = str, \
};
+/*
+ * RAPL Package energy counter scope:
+ * 1. AMD/HYGON platforms have a per-PKG package energy counter
+ * 2. For Intel platforms
+ * 2.1. CLX-AP is multi-die and its RAPL MSRs are die-scope
+ * 2.2. Other Intel platforms are single die systems so the scope can be
+ * considered as either pkg-scope or die-scope, and we are considering
+ * them as die-scope.
+ */
+#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 +153,25 @@ 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
@@ -552,7 +581,7 @@ 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(get_rapl_pmu_cpumask(cpu), cpu);
/* Migrate rapl events to the new target */
if (target < nr_cpu_ids) {
@@ -565,6 +594,11 @@ static int rapl_cpu_offline(unsigned int cpu)
static int rapl_cpu_online(unsigned int cpu)
{
+ s32 rapl_pmu_idx = get_rapl_pmu_idx(cpu);
+ if (rapl_pmu_idx < 0) {
+ pr_err("topology_logical_(package/die)_id() returned a negative value");
+ return -EINVAL;
+ }
struct rapl_pmu *pmu = cpu_to_rapl_pmu(cpu);
int target;
@@ -579,14 +613,14 @@ 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, get_rapl_pmu_cpumask(cpu));
if (target < nr_cpu_ids)
return 0;
@@ -675,7 +709,10 @@ 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)
|