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arm_pmu: acpi: check for mismatched PPIs

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The arm_pmu platform code explicitly checks for mismatched PPIs at probe
time, while the ACPI code leaves this to the core code. Future
refactoring will make this difficult for the core code to check, so
let's have the ACPI code check this explicitly.

As before, upon a failure we'll continue on without an interrupt. Ho
hum.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland
2018-02-05 16:41:59 +00:00
committed by Will Deacon
parent 0dc1a1851a
commit 43fc9a2feb
3 changed files with 42 additions and 24 deletions
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42
drivers/perf/arm_pmu_acpi.c
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@@ -11,6 +11,8 @@
#include <linux/acpi.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/percpu.h>
#include <linux/perf/arm_pmu.h>
@@ -139,6 +141,35 @@ static struct arm_pmu *arm_pmu_acpi_find_alloc_pmu(void)
return pmu;
}
/*
* Check whether the new IRQ is compatible with those already associated with
* the PMU (e.g. we don't have mismatched PPIs).
*/
static bool pmu_irq_matches(struct arm_pmu *pmu, int irq)
{
struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
int cpu;
if (!irq)
return true;
for_each_cpu(cpu, &pmu->supported_cpus) {
int other_irq = per_cpu(hw_events->irq, cpu);
if (!other_irq)
continue;
if (irq == other_irq)
continue;
if (!irq_is_percpu_devid(irq) && !irq_is_percpu_devid(other_irq))
continue;
pr_warn("mismatched PPIs detected\n");
return false;
}
return true;
}
/*
* This must run before the common arm_pmu hotplug logic, so that we can
* associate a CPU and its interrupt before the common code tries to manage the
@@ -164,18 +195,21 @@ static int arm_pmu_acpi_cpu_starting(unsigned int cpu)
if (!pmu)
return -ENOMEM;
cpumask_set_cpu(cpu, &pmu->supported_cpus);
per_cpu(probed_pmus, cpu) = pmu;
if (pmu_irq_matches(pmu, irq)) {
hw_events = pmu->hw_events;
per_cpu(hw_events->irq, cpu) = irq;
}
cpumask_set_cpu(cpu, &pmu->supported_cpus);
/*
* Log and request the IRQ so the core arm_pmu code can manage it. In
* some situations (e.g. mismatched PPIs), we may fail to request the
* IRQ. However, it may be too late for us to do anything about it.
* The common ARM PMU code will log a warning in this case.
*/
hw_events = pmu->hw_events;
per_cpu(hw_events->irq, cpu) = irq;
armpmu_request_irq(pmu, cpu);
/*