Messages in this thread Patch in this message | | | From | Vineet Gupta <> | Subject | [PATCH] ARC: perf: don't bail setup if pct irq missing in device-tree | Date | Sun, 26 Jul 2020 22:13:45 -0700 |
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Current code inadventely bails if hardware supports sampling/overflow interrupts, but the irq is missing from device tree. This need not be as we can still do simple counting based perf stat.
This unborks perf on HSDK-4xD
Signed-off-by: Vineet Gupta <vgupta@synopsys.com> --- arch/arc/kernel/perf_event.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-)
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c index 661fd842ea97..79849f37e782 100644 --- a/arch/arc/kernel/perf_event.c +++ b/arch/arc/kernel/perf_event.c @@ -562,7 +562,7 @@ static int arc_pmu_device_probe(struct platform_device *pdev) { struct arc_reg_pct_build pct_bcr; struct arc_reg_cc_build cc_bcr; - int i, has_interrupts; + int i, has_interrupts, irq; int counter_size; /* in bits */ union cc_name { @@ -637,13 +637,7 @@ static int arc_pmu_device_probe(struct platform_device *pdev) .attr_groups = arc_pmu->attr_groups, }; - if (has_interrupts) { - int irq = platform_get_irq(pdev, 0); - - if (irq < 0) { - pr_err("Cannot get IRQ number for the platform\n"); - return -ENODEV; - } + if (has_interrupts && (irq = platform_get_irq(pdev, 0) >= 0)) { arc_pmu->irq = irq; @@ -652,9 +646,9 @@ static int arc_pmu_device_probe(struct platform_device *pdev) this_cpu_ptr(&arc_pmu_cpu)); on_each_cpu(arc_cpu_pmu_irq_init, &irq, 1); - - } else + } else { arc_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; + } /* * perf parser doesn't really like '-' symbol in events name, so let's -- 2.20.1
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