From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E11E3CCA47F for ; Mon, 13 Jun 2022 10:07:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QezAbE05wF/UyJnY5sUNbGa/3K+vubwu8jEQkP0w6pY=; b=IAdoDVahEnKB3/ J5Sbj00GBpDaYkQanDzDKmP+Twi6z1ehCs1bHDSj17jWiyiB2aiUhjzI2tuiS4QodxCsL8B7Q5s8S VKQhJhbR/oLoa6zpQKPMIRRARMQqFyNy2HnY6ZWznWtJRHw3Z2nZuS/bzEPyC9LzLTkZ8I/O6DZ9O AC/VEMUlOxnnl1ly9D/ZqJ4MeUuQBLrWiSLmLS+BINF/IcWXZ1nZqSEwHJv2EyUzldqOW3VXOU63v UIeiq2ZdBQL34wUJJcVj+ItwDnSTc/+LCzn7q64fmk6Aw8AJqJTLOUbiC9jOBJj15URxSoK73pNPa MriGIZ73ig7UBk4vlZKQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o0gxQ-002m1w-Ah; Mon, 13 Jun 2022 10:06:04 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o0gtc-002kLY-Vw for linux-arm-kernel@lists.infradead.org; Mon, 13 Jun 2022 10:02:10 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1AE781042; Mon, 13 Jun 2022 03:02:08 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.38.134]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EBE383F66F; Mon, 13 Jun 2022 03:02:01 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peterz@infradead.org, acme@kernel.org, mark.rutland@arm.com, will@kernel.org Cc: Anshuman Khandual , Catalin Marinas , James Clark , Rob Herring , Marc Zyngier , Ingo Molnar , linux-perf-users@vger.kernel.org Subject: [PATCH 5/8] driver/perf/arm_pmu_platform: Add support for BRBE attributes detection Date: Mon, 13 Jun 2022 15:31:16 +0530 Message-Id: <20220613100119.684673-6-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220613100119.684673-1-anshuman.khandual@arm.com> References: <20220613100119.684673-1-anshuman.khandual@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220613_030209_146600_2DDEF507 X-CRM114-Status: GOOD ( 14.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This adds arm pmu infrastrure to probe BRBE implementation's attributes via driver exported callbacks later. The actual BRBE feature detection will be added by the driver itself. CPU specific BRBE entries, cycle count, format support gets detected during PMU init. This information gets saved in per-cpu struct pmu_hw_events which later helps in operating BRBE during a perf event context. Cc: Will Deacon Cc: Mark Rutland Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- drivers/perf/arm_pmu_platform.c | 34 +++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/drivers/perf/arm_pmu_platform.c b/drivers/perf/arm_pmu_platform.c index 513de1f54e2d..800e4a6e8bc3 100644 --- a/drivers/perf/arm_pmu_platform.c +++ b/drivers/perf/arm_pmu_platform.c @@ -172,6 +172,36 @@ static int armpmu_request_irqs(struct arm_pmu *armpmu) return err; } +static void arm_brbe_probe_cpu(void *info) +{ + struct pmu_hw_events *hw_events; + struct arm_pmu *armpmu = info; + + /* + * Return from here, if BRBE driver has not been + * implemented for this PMU. This helps prevent + * kernel crash later when brbe_probe() will be + * called on the PMU. + */ + if (!armpmu->brbe_probe) + return; + + hw_events = per_cpu_ptr(armpmu->hw_events, smp_processor_id()); + armpmu->brbe_probe(hw_events); +} + +static int armpmu_request_brbe(struct arm_pmu *armpmu) +{ + int cpu, err = 0; + + for_each_cpu(cpu, &armpmu->supported_cpus) { + err = smp_call_function_single(cpu, arm_brbe_probe_cpu, armpmu, 1); + if (err) + return err; + } + return err; +} + static void armpmu_free_irqs(struct arm_pmu *armpmu) { int cpu; @@ -229,6 +259,10 @@ int arm_pmu_device_probe(struct platform_device *pdev, if (ret) goto out_free_irqs; + ret = armpmu_request_brbe(pmu); + if (ret) + goto out_free_irqs; + ret = armpmu_register(pmu); if (ret) { dev_err(dev, "failed to register PMU devices!\n"); -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel