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 91BE8C47DDC for ; Tue, 23 Jan 2024 11:35:18 +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=Jp+TMTGXE3/vG+1BbcSuIp+RtTB4JhVXZyVksxqbJYU=; b=TnvISp+0QTFKBc YmUfxZC+pRHyv1eaHplqkCTfJBuaUyw1EHLbklX/ywmk+lJzUNn/59f6iPnjTwSZZyhvcqwDzdJNR iVIHi0eBM9EEWuobGXJOLx4+L5lhNaC8PjVRhszkmZfxUBplOhVR7gH8vr0jptqRtgI3wzLD9HeKy ERQywJO6Uy4DL4PGDZnu/l/yCJC0AWrVgTuNMF6fZo2Y9v1d1PxcbxPvgDZJUeoA3zzoDTVoLKpF9 AJDsnMDV8voy7rpynSpwOXMgQJ7jR9oGIs+WXEggdhayumtCJgqj0+c4mR8fZzQ7VWE6rPl+NHLWq P4ORIdh8qGcVy2Icka9A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rSF3H-00GDpg-05; Tue, 23 Jan 2024 11:34:47 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rSF3D-00GDmP-1I for linux-arm-kernel@lists.infradead.org; Tue, 23 Jan 2024 11:34:45 +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 40622106F; Tue, 23 Jan 2024 03:35:27 -0800 (PST) Received: from e126817.. (e126817.cambridge.arm.com [10.2.3.5]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 130203F762; Tue, 23 Jan 2024 03:34:39 -0800 (PST) From: Ben Gainey To: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: peterz@infradead.org, mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, will@kernel.org, Ben Gainey Subject: [RFC PATCH 2/2] arm_pmuv3: Add config bits for sample period strobing Date: Tue, 23 Jan 2024 11:34:20 +0000 Message-ID: <20240123113420.1928154-3-ben.gainey@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240123113420.1928154-1-ben.gainey@arm.com> References: <20240123113420.1928154-1-ben.gainey@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240123_033443_498167_CAFCDD36 X-CRM114-Status: GOOD ( 11.59 ) 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 To expose the ability to alternate between sample periods to tools. The field `strobe_period` is defined for config2 to hold the alternate sample period. A non-zero value will enable strobing. Signed-off-by: Ben Gainey --- drivers/perf/arm_pmuv3.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c index 23fa6c5da82c4..66b0219111bb8 100644 --- a/drivers/perf/arm_pmuv3.c +++ b/drivers/perf/arm_pmuv3.c @@ -318,6 +318,9 @@ static const struct attribute_group armv8_pmuv3_events_attr_group = { #define ATTR_CFG_FLD_threshold_CFG config1 /* PMEVTYPER.TH */ #define ATTR_CFG_FLD_threshold_LO 5 #define ATTR_CFG_FLD_threshold_HI 16 +#define ATTR_CFG_FLD_strobe_period_CFG config2 +#define ATTR_CFG_FLD_strobe_period_LO 0 +#define ATTR_CFG_FLD_strobe_period_HI 31 GEN_PMU_FORMAT_ATTR(event); GEN_PMU_FORMAT_ATTR(long); @@ -325,6 +328,7 @@ GEN_PMU_FORMAT_ATTR(rdpmc); GEN_PMU_FORMAT_ATTR(threshold_count); GEN_PMU_FORMAT_ATTR(threshold_compare); GEN_PMU_FORMAT_ATTR(threshold); +GEN_PMU_FORMAT_ATTR(strobe_period); static int sysctl_perf_user_access __read_mostly; @@ -352,6 +356,16 @@ static u8 armv8pmu_event_threshold_control(struct perf_event_attr *attr) return (th_compare << 1) | th_count; } +static inline u32 armv8pmu_event_strobe_period(struct perf_event *event) +{ + return ATTR_CFG_GET_FLD(&event->attr, strobe_period); +} + +static inline bool armv8pmu_event_want_strobe(struct perf_event *event) +{ + return armv8pmu_event_strobe_period(event) != 0; +} + static struct attribute *armv8_pmuv3_format_attrs[] = { &format_attr_event.attr, &format_attr_long.attr, @@ -359,6 +373,7 @@ static struct attribute *armv8_pmuv3_format_attrs[] = { &format_attr_threshold.attr, &format_attr_threshold_compare.attr, &format_attr_threshold_count.attr, + &format_attr_strobe_period.attr, NULL, }; @@ -1125,6 +1140,16 @@ static int __armv8_pmuv3_map_event(struct perf_event *event, if (armv8pmu_event_is_64bit(event)) event->hw.flags |= ARMPMU_EVT_64BIT; + /* + * Support alternating between two sample periods + */ + if (armv8pmu_event_want_strobe(event)) { + u32 strobe_period = armv8pmu_event_strobe_period(event); + armpmu_set_strobe_period(&(event->hw), strobe_period); + } else { + armpmu_set_strobe_period(&(event->hw), 0); + } + /* * User events must be allocated into a single counter, and so * must not be chained. -- 2.43.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel