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iommu/vt-d: Clean up cpumask and hotplug for perfmon

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The iommu PMU is system-wide scope, which is supported by the generic
perf_event subsystem now.

Set the scope for the iommu PMU and remove all the cpumask and hotplug
codes.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20240802151643.1691631-5-kan.liang@linux.intel.com
This commit is contained in:
Kan Liang 2024-08-02 08:16:40 -07:00 committed by Peter Zijlstra
parent 08155c7f2a
commit a8c73b82f7
2 changed files with 2 additions and 111 deletions
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2
drivers/iommu/intel/iommu.h
View File

@ -687,8 +687,6 @@ struct iommu_pmu {
DECLARE_BITMAP(used_mask, IOMMU_PMU_IDX_MAX);
struct perf_event *event_list[IOMMU_PMU_IDX_MAX];
unsigned char irq_name[16];
struct hlist_node cpuhp_node;
int cpu;
};
#define IOMMU_IRQ_ID_OFFSET_PRQ (DMAR_UNITS_SUPPORTED)

111
drivers/iommu/intel/perfmon.c
View File

@ -34,28 +34,9 @@ static struct attribute_group iommu_pmu_events_attr_group = {
.attrs = attrs_empty,
};
static cpumask_t iommu_pmu_cpu_mask;
static ssize_t
cpumask_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return cpumap_print_to_pagebuf(true, buf, &iommu_pmu_cpu_mask);
}
static DEVICE_ATTR_RO(cpumask);
static struct attribute *iommu_pmu_cpumask_attrs[] = {
&dev_attr_cpumask.attr,
NULL
};
static struct attribute_group iommu_pmu_cpumask_attr_group = {
.attrs = iommu_pmu_cpumask_attrs,
};
static const struct attribute_group *iommu_pmu_attr_groups[] = {
&iommu_pmu_format_attr_group,
&iommu_pmu_events_attr_group,
&iommu_pmu_cpumask_attr_group,
NULL
};
@ -565,6 +546,7 @@ static int __iommu_pmu_register(struct intel_iommu *iommu)
iommu_pmu->pmu.attr_groups = iommu_pmu_attr_groups;
iommu_pmu->pmu.attr_update = iommu_pmu_attr_update;
iommu_pmu->pmu.capabilities = PERF_PMU_CAP_NO_EXCLUDE;
iommu_pmu->pmu.scope = PERF_PMU_SCOPE_SYS_WIDE;
iommu_pmu->pmu.module = THIS_MODULE;
return perf_pmu_register(&iommu_pmu->pmu, iommu_pmu->pmu.name, -1);
@ -773,89 +755,6 @@ static void iommu_pmu_unset_interrupt(struct intel_iommu *iommu)
iommu->perf_irq = 0;
}
static int iommu_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
{
struct iommu_pmu *iommu_pmu = hlist_entry_safe(node, typeof(*iommu_pmu), cpuhp_node);
if (cpumask_empty(&iommu_pmu_cpu_mask))
cpumask_set_cpu(cpu, &iommu_pmu_cpu_mask);
if (cpumask_test_cpu(cpu, &iommu_pmu_cpu_mask))
iommu_pmu->cpu = cpu;
return 0;
}
static int iommu_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node)
{
struct iommu_pmu *iommu_pmu = hlist_entry_safe(node, typeof(*iommu_pmu), cpuhp_node);
int target = cpumask_first(&iommu_pmu_cpu_mask);
/*
* The iommu_pmu_cpu_mask has been updated when offline the CPU
* for the first iommu_pmu. Migrate the other iommu_pmu to the
* new target.
*/
if (target < nr_cpu_ids && target != iommu_pmu->cpu) {
perf_pmu_migrate_context(&iommu_pmu->pmu, cpu, target);
iommu_pmu->cpu = target;
return 0;
}
if (!cpumask_test_and_clear_cpu(cpu, &iommu_pmu_cpu_mask))
return 0;
target = cpumask_any_but(cpu_online_mask, cpu);
if (target < nr_cpu_ids)
cpumask_set_cpu(target, &iommu_pmu_cpu_mask);
else
return 0;
perf_pmu_migrate_context(&iommu_pmu->pmu, cpu, target);
iommu_pmu->cpu = target;
return 0;
}
static int nr_iommu_pmu;
static enum cpuhp_state iommu_cpuhp_slot;
static int iommu_pmu_cpuhp_setup(struct iommu_pmu *iommu_pmu)
{
int ret;
if (!nr_iommu_pmu) {
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
"driver/iommu/intel/perfmon:online",
iommu_pmu_cpu_online,
iommu_pmu_cpu_offline);
if (ret < 0)
return ret;
iommu_cpuhp_slot = ret;
}
ret = cpuhp_state_add_instance(iommu_cpuhp_slot, &iommu_pmu->cpuhp_node);
if (ret) {
if (!nr_iommu_pmu)
cpuhp_remove_multi_state(iommu_cpuhp_slot);
return ret;
}
nr_iommu_pmu++;
return 0;
}
static void iommu_pmu_cpuhp_free(struct iommu_pmu *iommu_pmu)
{
cpuhp_state_remove_instance(iommu_cpuhp_slot, &iommu_pmu->cpuhp_node);
if (--nr_iommu_pmu)
return;
cpuhp_remove_multi_state(iommu_cpuhp_slot);
}
void iommu_pmu_register(struct intel_iommu *iommu)
{
struct iommu_pmu *iommu_pmu = iommu->pmu;
@ -866,17 +765,12 @@ void iommu_pmu_register(struct intel_iommu *iommu)
if (__iommu_pmu_register(iommu))
goto err;
if (iommu_pmu_cpuhp_setup(iommu_pmu))
goto unregister;
/* Set interrupt for overflow */
if (iommu_pmu_set_interrupt(iommu))
goto cpuhp_free;
goto unregister;
return;
cpuhp_free:
iommu_pmu_cpuhp_free(iommu_pmu);
unregister:
perf_pmu_unregister(&iommu_pmu->pmu);
err:
@ -892,6 +786,5 @@ void iommu_pmu_unregister(struct intel_iommu *iommu)
return;
iommu_pmu_unset_interrupt(iommu);
iommu_pmu_cpuhp_free(iommu_pmu);
perf_pmu_unregister(&iommu_pmu->pmu);
}