linux-kernel - Re: [PATCH v5 2/2] perf: Fujitsu: Add the Uncore PCI PMU driver

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Message-ID: <20250617103618.GT1613376@noisy.programming.kicks-ass.net>
Date: Tue, 17 Jun 2025 12:36:18 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Koichi Okuno <fj2767dz@...itsu.com>
Cc: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Jonathan Corbet <corbet@....net>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Bjorn Andersson <quic_bjorande@...cinc.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Nícolas F. R. A. Prado <nfraprado@...labora.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] perf: Fujitsu: Add the Uncore PCI PMU driver

On Tue, Jun 17, 2025 at 07:27:50PM +0900, Koichi Okuno wrote:
> +	pcipmu->pmu = (struct pmu) {
> +		.parent		= dev,
> +		.task_ctx_nr	= perf_invalid_context,
> +
> +		.pmu_enable	= fujitsu_pci__pmu_enable,
> +		.pmu_disable	= fujitsu_pci__pmu_disable,
> +		.event_init	= fujitsu_pci__event_init,
> +		.add		= fujitsu_pci__event_add,
> +		.del		= fujitsu_pci__event_del,
> +		.start		= fujitsu_pci__event_start,
> +		.stop		= fujitsu_pci__event_stop,
> +		.read		= fujitsu_pci__event_read,
> +
> +		.attr_groups	= fujitsu_pci_pmu_attr_grps,
> +		.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,

Should these drivers not also have PERF_PMU_CAP_NO_INTERRUPT ? Per them
being uncore they cannot generate samples.

> +	};