From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 59E43249EB for ; Fri, 19 Dec 2025 10:33:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766140403; cv=none; b=ers1RUn5hIxVWScimqMGjdcTP4AdHgQMX6C3dPJzJRRGkD6+0QQeyjrtFRcoksYHeLJdl7DeAxzds9NMQilpYh+KrDfI9yVKPoyCfoy7xC/5vEH6b7k4d7hsRN9V4l9CWbbSPUAxefsQ2heGDcjMQJm/aQ5UkkyP2lT0O3tHPZo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766140403; c=relaxed/simple; bh=UMH1nQ7fJ5IlzNQ8/kX1aOFGTv6ZBMUIOI+3iUsUEhs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=msliKt0+nwx75FFJAG974VM5qZq5XvNsDJjkKj3nrCU7fVWAMgj2RObE0L8nCKa3UN+dDc0PIXDU6KLS+5Oys7cadi7ODS8FKeHe8hGWKSxlpi2RmxvjqmG7bC2fd+SPCtZ/BbJkDQq6CPd1EpZBJ6gKJBxtHNSzE6mweelY6Lk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 AB5F8FEC; Fri, 19 Dec 2025 02:33:14 -0800 (PST) Received: from [10.1.197.1] (ewhatever.cambridge.arm.com [10.1.197.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id ABD953F5CA; Fri, 19 Dec 2025 02:33:20 -0800 (PST) Message-ID: Date: Fri, 19 Dec 2025 10:33:19 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 3/3] coresight: tpda: add sysfs node to flush specific port To: Jie Gan , Mike Leach , James Clark , Alexander Shishkin , Tingwei Zhang Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Tao Zhang References: <20251219-add_sysfs_nodes_to_configure_tpda-v5-0-ca93ddfe9d30@oss.qualcomm.com> <20251219-add_sysfs_nodes_to_configure_tpda-v5-3-ca93ddfe9d30@oss.qualcomm.com> Content-Language: en-US From: Suzuki K Poulose In-Reply-To: <20251219-add_sysfs_nodes_to_configure_tpda-v5-3-ca93ddfe9d30@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 19/12/2025 10:04, Jie Gan wrote: > From: Tao Zhang > > Setting bit i in the TPDA_FLUSH_CR register initiates a flush request > for port i, forcing the data to synchronize and be transmitted to the > sink device. > > Signed-off-by: Tao Zhang > Reviewed-by: James Clark > Co-developed-by: Jie Gan > Signed-off-by: Jie Gan > --- > .../ABI/testing/sysfs-bus-coresight-devices-tpda | 7 ++++ > drivers/hwtracing/coresight/coresight-tpda.c | 49 ++++++++++++++++++++++ > drivers/hwtracing/coresight/coresight-tpda.h | 1 + > 3 files changed, 57 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > index a7855922328e..ef2804f87d1e 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > @@ -41,3 +41,10 @@ Contact: Jinlong Mao , Tao Zhang Description: > (RW) Configure the CMB/MCMB channel mode for all enabled ports. > Value 0 means raw channel mapping mode. Value 1 means channel pair marking mode. > + > +What: /sys/bus/coresight/devices//port_flush_req > +Date: December 2025 > +KernelVersion: 6.19 > +Contact: Jinlong Mao , Tao Zhang , Jie Gan > +Description: > + (RW) Configure the bit i to requests a flush operation of port i on the TPDA. > diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c > index d378ff8ad77d..5b4a9e41b067 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.c > +++ b/drivers/hwtracing/coresight/coresight-tpda.c > @@ -375,6 +375,45 @@ static ssize_t tpda_trig_sysfs_store(struct device *dev, > return ret; > } > > +static ssize_t port_flush_req_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (!drvdata->csdev->refcnt) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + val = readl_relaxed(drvdata->base + TPDA_FLUSH_CR); > + > + return sysfs_emit(buf, "0x%lx\n", val); > +} > + > +static ssize_t port_flush_req_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + u32 val; > + > + if (kstrtou32(buf, 0, &val)) > + return -EINVAL; > + > + if (!drvdata->csdev->refcnt || !val) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + CS_UNLOCK(drvdata->base); > + writel_relaxed(val, drvdata->base + TPDA_FLUSH_CR); > + CS_LOCK(drvdata->base); > + > + return size; > +} > +static DEVICE_ATTR_RW(port_flush_req); > + > static struct attribute *tpda_global_cr_attrs[] = { > tpda_trig_sysfs_rw(global_flush_req, FLREQ), > tpda_trig_sysfs_rw(freq_ts_enable, FREQTS), > @@ -385,13 +424,23 @@ static struct attribute *tpda_global_cr_attrs[] = { > NULL, > }; > > +static struct attribute *tpda_attrs[] = { > + &dev_attr_port_flush_req.attr, > + NULL, > +}; > + But why ? Why can't this be a part of the tpda_global_cr_attrs[] ? For that matter, why is tpda_global_cr_attrs named as such and why not tpda_attrs ? Suzuki > static struct attribute_group tpda_global_cr_attr_grp = { > .attrs = tpda_global_cr_attrs, > .name = "global_cr", > }; > > +static struct attribute_group tpda_attr_grp = { > + .attrs = tpda_attrs, > +}; > + > static const struct attribute_group *tpda_attr_grps[] = { > &tpda_global_cr_attr_grp, > + &tpda_attr_grp, > NULL, > }; > > diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h > index 97e2729c15c9..ec93f9cb9648 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.h > +++ b/drivers/hwtracing/coresight/coresight-tpda.h > @@ -10,6 +10,7 @@ > #define TPDA_Pn_CR(n) (0x004 + (n * 4)) > #define TPDA_FPID_CR (0x084) > #define TPDA_SYNCR (0x08C) > +#define TPDA_FLUSH_CR (0x090) > > /* Cross trigger Global (all ports) flush request bit */ > #define TPDA_CR_FLREQ BIT(0) >