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perf/marvell: cn10k DDR perf event core ownership

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As DDR perf event counters are not per core, so they should be accessed
only by one core at a time. Select new core when previously owning core
is going offline.

Signed-off-by: Bharat Bhushan <bbhushan2@marvell.com>
Reviewed-by: Bhaskara Budiredla <bbudiredla@marvell.com>
Link: https://lore.kernel.org/r/20220211045346.17894-5-bbhushan2@marvell.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Bharat Bhushan 2022-02-11 10:23:46 +05:30 committed by Will Deacon
parent 35a43326a9
commit 68fa55f0e0
3 changed files with 56 additions and 2 deletions
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7
drivers/perf/Kconfig
View file

@ -148,4 +148,11 @@ config MARVELL_CN10K_TAD_PMU
source "drivers/perf/hisilicon/Kconfig"
config MARVELL_CN10K_DDR_PMU
tristate "Enable MARVELL CN10K DRAM Subsystem(DSS) PMU Support"
depends on ARM64 || (COMPILE_TEST && 64BIT)
help
Enable perf support for Marvell DDR Performance monitoring
event on CN10K platform.
endmenu

50
drivers/perf/marvell_cn10k_ddr_pmu.c
View file

@ -129,6 +129,7 @@ struct cn10k_ddr_pmu {
int active_events;
struct perf_event *events[DDRC_PERF_NUM_COUNTERS];
struct hrtimer hrtimer;
struct hlist_node node;
};
#define to_cn10k_ddr_pmu(p) container_of(p, struct cn10k_ddr_pmu, pmu)
@ -610,6 +611,24 @@ static enum hrtimer_restart cn10k_ddr_pmu_timer_handler(struct hrtimer *hrtimer)
return HRTIMER_RESTART;
}
static int cn10k_ddr_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
{
struct cn10k_ddr_pmu *pmu = hlist_entry_safe(node, struct cn10k_ddr_pmu,
node);
unsigned int target;
if (cpu != pmu->cpu)
return 0;
target = cpumask_any_but(cpu_online_mask, cpu);
if (target >= nr_cpu_ids)
return 0;
perf_pmu_migrate_context(&pmu->pmu, cpu, target);
pmu->cpu = target;
return 0;
}
static int cn10k_ddr_perf_probe(struct platform_device *pdev)
{
struct cn10k_ddr_pmu *ddr_pmu;
@ -661,18 +680,31 @@ static int cn10k_ddr_perf_probe(struct platform_device *pdev)
hrtimer_init(&ddr_pmu->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
ddr_pmu->hrtimer.function = cn10k_ddr_pmu_timer_handler;
cpuhp_state_add_instance_nocalls(
CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
&ddr_pmu->node);
ret = perf_pmu_register(&ddr_pmu->pmu, name, -1);
if (ret)
return ret;
goto error;
pr_info("CN10K DDR PMU Driver for ddrc@%llx\n", res->start);
return 0;
error:
cpuhp_state_remove_instance_nocalls(
CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
&ddr_pmu->node);
return ret;
}
static int cn10k_ddr_perf_remove(struct platform_device *pdev)
{
struct cn10k_ddr_pmu *ddr_pmu = platform_get_drvdata(pdev);
cpuhp_state_remove_instance_nocalls(
CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
&ddr_pmu->node);
perf_pmu_unregister(&ddr_pmu->pmu);
return 0;
}
@ -697,12 +729,26 @@ static struct platform_driver cn10k_ddr_pmu_driver = {
static int __init cn10k_ddr_pmu_init(void)
{
return platform_driver_register(&cn10k_ddr_pmu_driver);
int ret;
ret = cpuhp_setup_state_multi(
CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
"perf/marvell/cn10k/ddr:online", NULL,
cn10k_ddr_pmu_offline_cpu);
if (ret)
return ret;
ret = platform_driver_register(&cn10k_ddr_pmu_driver);
if (ret)
cpuhp_remove_multi_state(
CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE);
return ret;
}
static void __exit cn10k_ddr_pmu_exit(void)
{
platform_driver_unregister(&cn10k_ddr_pmu_driver);
cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE);
}
module_init(cn10k_ddr_pmu_init);

1
include/linux/cpuhotplug.h
View file

@ -231,6 +231,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,