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[PATCH] arm: perf: Set affinity for PPI based PMUs

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  [PATCH] arm: perf: Set affinity for PPI based PMUs Stephen Boyd <sboyd@codeaurora.org> - 2015-06-30 00:00 +0200
    Re: [PATCH] arm: perf: Set affinity for PPI based PMUs Stephen Boyd <sboyd@codeaurora.org> - 2015-07-01 03:20 +0200

#1174133 — [PATCH] arm: perf: Set affinity for PPI based PMUs

For PPI based PMUs, we bail out early in of_pmu_irq_cfg() without
setting the PMU's supported_cpus bitmap. This causes the
smp_call_function_any() in armv7_probe_num_events() to fail. Set
the bitmap to be all CPUs so that we properly probe PMUs that use
PPIs.

Fixes: cc88116da0d1 ("arm: perf: treat PMUs as CPU affine")
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 arch/arm/kernel/perf_event.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 54272e0be713..7d5379c1c443 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -795,8 +795,10 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu)
 
 	/* Don't bother with PPIs; they're already affine */
 	irq = platform_get_irq(pdev, 0);
-	if (irq >= 0 && irq_is_percpu(irq))
+	if (irq >= 0 && irq_is_percpu(irq)) {
+		cpumask_setall(&pmu->supported_cpus);
 		return 0;
+	}
 
 	irqs = kcalloc(pdev->num_resources, sizeof(*irqs), GFP_KERNEL);
 	if (!irqs)
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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#1174859

On 06/30/2015 01:52 AM, Will Deacon wrote:
> Looks good to me as a fix, but I'm currently working on extending the
> interrupt-affinity property to work with both SPIs and PPIs so that we
> can use it to identify PMU affinity on multi-cluster systems.
>
>   https://git.kernel.org/cgit/linux/kernel/git/will/linux.git/commit/?h=perf/updates&id=633fa0b629d86e58d68aff295f92031877dd0294
>
> Any chance you could take that for a spin on your platform, please?
>

The patch you point to works fine on Krait based platforms when the
interrupt-affinity property isn't present in DT. We (luckily?) don't
have any multi-cluster Krait designs so we don't need to add the
interrupt-affinity property in those DTs. Feel free to add a

Tested-by: Stephen Boyd <sboyd@codeaurora.org> # Krait PMU

-- 
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a Linux Foundation Collaborative Project

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