From patchwork Sun Jan 10 22:48:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suzuki K Poulose X-Patchwork-Id: 12009553 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,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 3E0D2C433E0 for ; Sun, 10 Jan 2021 23:02:54 +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 F2169229CA for ; Sun, 10 Jan 2021 23:02:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F2169229CA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.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=bxmE7JXmS41sRdMkGYoqQ3TdFcwLGZQ1wIlAXEZB5HQ=; b=FrLoWXLzKvSq3VX7VqHkdcpTv F8DCLcAdRHdSn7NcjKRr7O4kQmwdkwamWvELY4ywt+/KrIK4WzUJ0umrafEL4iMskY6CUUIRYmN60 gkCp2zhDl+1IPY5EnRLDNFdOm3+BdzDrqanqC61DrUC6uDX8dylNFo2sEhq7D3QXd0imxyJkzdDg0 W9+WnCqdrUldFee2dsvUaGTJdzMUbz9jZRtygxkM8mnrehuE0GirI6UaXCTbrv0pYmPk8jMLS8wWg 0Uane9VfEQxRh8GpuHYzkCtgeUT5MFPBwavfp91v2i7XpeF1GqUtNsObLxXY3coGb0wl2mc6cyZmu p10/Qa/EQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kyjhx-0004D2-7H; Sun, 10 Jan 2021 23:01:13 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kyjWw-00071t-Iv for linux-arm-kernel@lists.infradead.org; Sun, 10 Jan 2021 22:49:51 +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 4E12515DB; Sun, 10 Jan 2021 14:49:46 -0800 (PST) Received: from ewhatever.cambridge.arm.com (ewhatever.cambridge.arm.com [10.1.197.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D8C213F719; Sun, 10 Jan 2021 14:49:44 -0800 (PST) From: Suzuki K Poulose To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v7 28/28] coresight: Add support for v8.4 SelfHosted tracing Date: Sun, 10 Jan 2021 22:48:50 +0000 Message-Id: <20210110224850.1880240-29-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20210110224850.1880240-1-suzuki.poulose@arm.com> References: <20210110224850.1880240-1-suzuki.poulose@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210110_174950_727205_1CEE663D X-CRM114-Status: GOOD ( 13.43 ) 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: mathieu.poirier@linaro.org, anshuman.khandual@arm.com, catalin.marinas@arm.com, coresight@lists.linaro.org, Suzuki K Poulose , linux-kernel@vger.kernel.org, leo.yan@linaro.org, Will Deacon , jonathan.zhouwen@huawei.com, mike.leach@linaro.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Jonathan Zhou v8.4 tracing extensions added support for trace filtering controlled by TRFCR_ELx. This must be programmed to allow tracing at EL1/EL2 and EL0. The timestamp used is the virtual time. Also enable CONTEXIDR_EL2 tracing if we are running the kernel at EL2. Cc: Catalin Marinas Cc: Mike Leach Cc: Will Deacon Reviewed-by: Mathieu Poirier Signed-off-by: Jonathan Zhou [ Move the trace filtering setup etm_init_arch_data() and clean ups] Signed-off-by: Suzuki K Poulose --- .../coresight/coresight-etm4x-core.c | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 3d3165dd09d4..18c1a80abab8 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -859,6 +859,30 @@ static bool etm4_init_csdev_access(struct etmv4_drvdata *drvdata, return false; } +static void cpu_enable_tracing(void) +{ + u64 dfr0 = read_sysreg(id_aa64dfr0_el1); + u64 trfcr; + + if (!cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_TRACE_FILT_SHIFT)) + return; + + /* + * If the CPU supports v8.4 SelfHosted Tracing, enable + * tracing at the kernel EL and EL0, forcing to use the + * virtual time as the timestamp. + */ + trfcr = (TRFCR_ELx_TS_VIRTUAL | + TRFCR_ELx_ExTRE | + TRFCR_ELx_E0TRE); + + /* If we are running at EL2, allow tracing the CONTEXTIDR_EL2. */ + if (is_kernel_in_hyp_mode()) + trfcr |= TRFCR_EL2_CX; + + write_sysreg_s(trfcr, SYS_TRFCR_EL1); +} + static void etm4_init_arch_data(void *info) { u32 etmidr0; @@ -1044,6 +1068,7 @@ static void etm4_init_arch_data(void *info) /* NUMCNTR, bits[30:28] number of counters available for tracing */ drvdata->nr_cntr = BMVAL(etmidr5, 28, 30); etm4_cs_lock(drvdata, csa); + cpu_enable_tracing(); } static inline u32 etm4_get_victlr_access_type(struct etmv4_config *config)