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 X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0659AC433DB for ; Sat, 30 Jan 2021 07:17:20 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C128464DDC for ; Sat, 30 Jan 2021 07:17:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C128464DDC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-ID:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=nkwcjkuOZqGkaHidxflggeAdykDC3YtMeJXBsiRmijA=; b=FxZtyQqAyBol6gJqBn2gabdnd c6E1DktYqS0DGcy99/saUtoXnBuDU4orhcmqCegQdzntsxoVbTLZJk/OhwB6DS6wbOJqt4MRmlCiu mSPGO5k3vTc2CTqXOqxEaeE3lFpG6rkxiuFxoWmIfFYbdaOluMEeA4RutjJf7wsrWCDD1GT6nlkp0 46vP5AbzRvath7JAdNEHMdcElckeJqy07L5WsMSZJ2q6K1TMIqY9JyTZAU0jdKfzkOCDXHMjbJYNI /ezqI3H+c5CcXkx+NB0i+4DTJpat/zNUGA6hQ+CvumUJvW5QluUxWY2Hn53psAFdPwuW77p7p1WiC i0npyRZNQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l5kUR-0004gA-Id; Sat, 30 Jan 2021 07:16:15 +0000 Received: from szxga04-in.huawei.com ([45.249.212.190]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l5kUG-0004dP-0I for linux-arm-kernel@lists.infradead.org; Sat, 30 Jan 2021 07:16:08 +0000 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4DSQSc3558z161cG; Sat, 30 Jan 2021 15:14:40 +0800 (CST) Received: from thunder-town.china.huawei.com (10.174.176.220) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.498.0; Sat, 30 Jan 2021 15:15:46 +0800 From: Zhen Lei To: Will Deacon , Robin Murphy , "Mark Rutland" , Joerg Roedel , linux-arm-kernel , iommu , linux-kernel Subject: [PATCH v4 1/2] perf/smmuv3: Don't reserve the PMCG register spaces Date: Sat, 30 Jan 2021 15:14:13 +0800 Message-ID: <20210130071414.1575-2-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.26.0.windows.1 In-Reply-To: <20210130071414.1575-1-thunder.leizhen@huawei.com> References: <20210130071414.1575-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.176.220] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210130_021604_399009_D5AB6224 X-CRM114-Status: GOOD ( 12.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jean-Philippe Brucker , Shameer Kolothum , Zhen Lei 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 According to the SMMUv3 specification: Each PMCG counter group is represented by one 4KB page (Page 0) with one optional additional 4KB page (Page 1), both of which are at IMPLEMENTATION DEFINED base addresses. This means that the PMCG register spaces may be within the 64KB pages of the SMMUv3 register space. When both the SMMU and PMCG drivers reserve their own resources, a resource conflict occurs. To avoid this conflict, don't reserve the PMCG regions. Suggested-by: Robin Murphy Signed-off-by: Zhen Lei --- drivers/perf/arm_smmuv3_pmu.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index 74474bb322c3f26..5e894f957c7b935 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -793,17 +793,30 @@ static int smmu_pmu_probe(struct platform_device *pdev) .capabilities = PERF_PMU_CAP_NO_EXCLUDE, }; - smmu_pmu->reg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res_0); - if (IS_ERR(smmu_pmu->reg_base)) - return PTR_ERR(smmu_pmu->reg_base); + /* + * The register spaces of the PMCG may be in the register space of + * other devices. For example, SMMU. Therefore, the PMCG resources are + * not reserved to avoid resource conflicts with other drivers. + */ + res_0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res_0) + return ERR_PTR(-EINVAL); + smmu_pmu->reg_base = devm_ioremap(dev, res_0->start, resource_size(res_0)); + if (!smmu_pmu->reg_base) + return ERR_PTR(-ENOMEM); cfgr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CFGR); /* Determine if page 1 is present */ if (cfgr & SMMU_PMCG_CFGR_RELOC_CTRS) { - smmu_pmu->reloc_base = devm_platform_ioremap_resource(pdev, 1); - if (IS_ERR(smmu_pmu->reloc_base)) - return PTR_ERR(smmu_pmu->reloc_base); + struct resource *res_1; + + res_1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res_1) + return ERR_PTR(-EINVAL); + smmu_pmu->reloc_base = devm_ioremap(dev, res_1->start, resource_size(res_1)); + if (!smmu_pmu->reloc_base) + return ERR_PTR(-ENOMEM); } else { smmu_pmu->reloc_base = smmu_pmu->reg_base; } -- 1.8.3 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel