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authorLinus Torvalds <torvalds@linux-foundation.org>2024-09-18 15:00:50 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2024-09-18 15:00:50 +0200
commit941c122da5c8355335dc16011c1c291a32cd1118 (patch)
treefd6c32985e5b665479645d3d9f6b1d043a62f6d3 /arch
parent9f39757957c11677ceb4600c81888db12b2fef5d (diff)
parentef493f4b122d6b14a6de111d1acac1eab1d673b0 (diff)
Merge tag 'perf-urgent-2024-09-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf event fixes from Ingo Molnar: "Left over from the v6.11 cycle: - Fix energy-pkg event enumeration on certain AMD CPUs - Set up the LBR branch stack for BPF counting events too" * tag 'perf-urgent-2024-09-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel: Allow to setup LBR for counting event for BPF perf/x86/rapl: Fix the energy-pkg event for AMD CPUs
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/events/intel/core.c8
-rw-r--r--arch/x86/events/rapl.c47
2 files changed, 48 insertions, 7 deletions
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 9e519d8a810a..d879478db3f5 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3972,8 +3972,12 @@ static int intel_pmu_hw_config(struct perf_event *event)
x86_pmu.pebs_aliases(event);
}
- if (needs_branch_stack(event) && is_sampling_event(event))
- event->hw.flags |= PERF_X86_EVENT_NEEDS_BRANCH_STACK;
+ if (needs_branch_stack(event)) {
+ /* Avoid branch stack setup for counting events in SAMPLE READ */
+ if (is_sampling_event(event) ||
+ !(event->attr.sample_type & PERF_SAMPLE_READ))
+ event->hw.flags |= PERF_X86_EVENT_NEEDS_BRANCH_STACK;
+ }
if (branch_sample_counters(event)) {
struct perf_event *leader, *sibling;
diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index b985ca79cf97..a481a939862e 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)