drivers/perf: hisi: Support PMUs with no interrupt

We'll have PMUs don't have an interrupt to indicate the counter
overflow, but the Uncore PMU core assume all the PMUs have
interrupt. So handle this case in the core. The existing PMUs
won't be affected.

Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Yicong Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Yicong Yang

drivers/perf/hisilicon/hisi_uncore_pmu.c

@@ -510,7 +510,9 @@ int hisi_uncore_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
 			return 0;
 
 		hisi_pmu->on_cpu = cpumask_local_spread(0, dev_to_node(hisi_pmu->dev));
-		WARN_ON(irq_set_affinity(hisi_pmu->irq, cpumask_of(hisi_pmu->on_cpu)));
+		if (hisi_pmu->irq > 0)
+			WARN_ON(irq_set_affinity(hisi_pmu->irq,
+						 cpumask_of(hisi_pmu->on_cpu)));
 		return 0;
 	}
 
@@ -525,7 +527,8 @@ int hisi_uncore_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
 	hisi_pmu->on_cpu = cpu;
 
 	/* Overflow interrupt also should use the same CPU */
-	WARN_ON(irq_set_affinity(hisi_pmu->irq, cpumask_of(cpu)));
+	if (hisi_pmu->irq > 0)
+		WARN_ON(irq_set_affinity(hisi_pmu->irq, cpumask_of(cpu)));
 
 	return 0;
 }
@@ -560,7 +563,9 @@ int hisi_uncore_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
 	perf_pmu_migrate_context(&hisi_pmu->pmu, cpu, target);
 	/* Use this CPU for event counting */
 	hisi_pmu->on_cpu = target;
-	WARN_ON(irq_set_affinity(hisi_pmu->irq, cpumask_of(target)));
+
+	if (hisi_pmu->irq > 0)
+		WARN_ON(irq_set_affinity(hisi_pmu->irq, cpumask_of(target)));
 
 	return 0;
 }