static int hisi_ddrc_pmu_probe()

in hisilicon/hisi_uncore_ddrc_pmu.c [486:543]

• 50 lines of code
• 6 McCabe index (conditional complexity)

static int hisi_ddrc_pmu_probe(struct platform_device *pdev)
{
	struct hisi_pmu *ddrc_pmu;
	char *name;
	int ret;

	ddrc_pmu = devm_kzalloc(&pdev->dev, sizeof(*ddrc_pmu), GFP_KERNEL);
	if (!ddrc_pmu)
		return -ENOMEM;

	platform_set_drvdata(pdev, ddrc_pmu);

	ret = hisi_ddrc_pmu_dev_probe(pdev, ddrc_pmu);
	if (ret)
		return ret;

	ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
				       &ddrc_pmu->node);
	if (ret) {
		dev_err(&pdev->dev, "Error %d registering hotplug;\n", ret);
		return ret;
	}

	if (ddrc_pmu->identifier >= HISI_PMU_V2)
		name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
				      "hisi_sccl%u_ddrc%u_%u",
				      ddrc_pmu->sccl_id, ddrc_pmu->index_id,
				      ddrc_pmu->sub_id);
	else
		name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
				      "hisi_sccl%u_ddrc%u", ddrc_pmu->sccl_id,
				      ddrc_pmu->index_id);

	ddrc_pmu->pmu = (struct pmu) {
		.name		= name,
		.module		= THIS_MODULE,
		.task_ctx_nr	= perf_invalid_context,
		.event_init	= hisi_uncore_pmu_event_init,
		.pmu_enable	= hisi_uncore_pmu_enable,
		.pmu_disable	= hisi_uncore_pmu_disable,
		.add		= hisi_uncore_pmu_add,
		.del		= hisi_uncore_pmu_del,
		.start		= hisi_uncore_pmu_start,
		.stop		= hisi_uncore_pmu_stop,
		.read		= hisi_uncore_pmu_read,
		.attr_groups	= ddrc_pmu->pmu_events.attr_groups,
		.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,
	};

	ret = perf_pmu_register(&ddrc_pmu->pmu, name, -1);
	if (ret) {
		dev_err(ddrc_pmu->dev, "DDRC PMU register failed!\n");
		cpuhp_state_remove_instance_nocalls(
			CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, &ddrc_pmu->node);
	}

	return ret;
}