From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF40730FA7 for ; Wed, 20 Sep 2023 12:27:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33E71C433C8; Wed, 20 Sep 2023 12:27:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695212823; bh=Gb7yHe4NrQj/Z2pggUi7Mq2gAFY3Onb69PNv9uFwsTs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IVzadv/tAmBAc712hT2FU+eLHSsupdmneoKEGn/pZaMJS2z5Oo0nR59lnrVekyAni NgbnGoh8VMoxRa6hyp8+CqXoG9vMzWm6qhhbqaseaSlnNbLTZkcTjSJqmJTENPiKi6 FVxeninZuw9vaEr1tfmp01BqkwrdeCt4NvW9RHyc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xu Yang , Frank Li , Will Deacon , Sasha Levin Subject: [PATCH 5.4 058/367] perf/imx_ddr: dont enable counter0 if none of 4 counters are used Date: Wed, 20 Sep 2023 13:27:15 +0200 Message-ID: <20230920112900.003705580@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112858.471730572@linuxfoundation.org> References: <20230920112858.471730572@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xu Yang [ Upstream commit f4e2bd91ddf5e8543cbe7ad80b3fba3d2dc63fa3 ] In current driver, counter0 will be enabled after ddr_perf_pmu_enable() is called even though none of the 4 counters are used. This will cause counter0 continue to count until ddr_perf_pmu_disabled() is called. If pmu is not disabled all the time, the pmu interrupt will be asserted from time to time due to counter0 will overflow and irq handler will clear it. It's not an expected behavior. This patch will not enable counter0 if none of 4 counters are used. Fixes: 9a66d36cc7ac ("drivers/perf: imx_ddr: Add DDR performance counter support to perf") Signed-off-by: Xu Yang Reviewed-by: Frank Li Link: https://lore.kernel.org/r/20230811015438.1999307-2-xu.yang_2@nxp.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- drivers/perf/fsl_imx8_ddr_perf.c | 24 +++++++++--------------- 1 file changed, 9 insertions(+), 15 deletions(-) diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c index 912a220a9db92..a0e45c726bbf0 100644 --- a/drivers/perf/fsl_imx8_ddr_perf.c +++ b/drivers/perf/fsl_imx8_ddr_perf.c @@ -77,6 +77,7 @@ struct ddr_pmu { const struct fsl_ddr_devtype_data *devtype_data; int irq; int id; + int active_counter; }; static ssize_t ddr_perf_cpumask_show(struct device *dev, @@ -353,6 +354,10 @@ static void ddr_perf_event_start(struct perf_event *event, int flags) ddr_perf_counter_enable(pmu, event->attr.config, counter, true); + if (!pmu->active_counter++) + ddr_perf_counter_enable(pmu, EVENT_CYCLES_ID, + EVENT_CYCLES_COUNTER, true); + hwc->state = 0; } @@ -407,6 +412,10 @@ static void ddr_perf_event_stop(struct perf_event *event, int flags) ddr_perf_counter_enable(pmu, event->attr.config, counter, false); ddr_perf_event_update(event); + if (!--pmu->active_counter) + ddr_perf_counter_enable(pmu, EVENT_CYCLES_ID, + EVENT_CYCLES_COUNTER, false); + hwc->state |= PERF_HES_STOPPED; } @@ -425,25 +434,10 @@ static void ddr_perf_event_del(struct perf_event *event, int flags) static void ddr_perf_pmu_enable(struct pmu *pmu) { - struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); - - /* enable cycle counter if cycle is not active event list */ - if (ddr_pmu->events[EVENT_CYCLES_COUNTER] == NULL) - ddr_perf_counter_enable(ddr_pmu, - EVENT_CYCLES_ID, - EVENT_CYCLES_COUNTER, - true); } static void ddr_perf_pmu_disable(struct pmu *pmu) { - struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); - - if (ddr_pmu->events[EVENT_CYCLES_COUNTER] == NULL) - ddr_perf_counter_enable(ddr_pmu, - EVENT_CYCLES_ID, - EVENT_CYCLES_COUNTER, - false); } static int ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base, -- 2.40.1