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[45.79.221.244]) by smtp.gmail.com with ESMTPSA id w206sm276464ywc.51.2019.08.27.20.37.00 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 27 Aug 2019 20:37:06 -0700 (PDT) Date: Wed, 28 Aug 2019 11:36:54 +0800 From: Leo Yan To: Mike Leach Subject: Re: [PATCH 5/8] coresight: etm4x: Improve usability of sysfs API. Message-ID: <20190828033654.GE26133@leoy-ThinkPad-X240s> References: <20190819205720.24457-1-mike.leach@linaro.org> <20190819205720.24457-6-mike.leach@linaro.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190819205720.24457-6-mike.leach@linaro.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190827_203708_622848_E1054AD4 X-CRM114-Status: GOOD ( 25.77 ) 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: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, mathieu.poirier@linaro.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Aug 19, 2019 at 09:57:17PM +0100, Mike Leach wrote: > Some changes to make the sysfs programming more intuitive. > > 1) Setting include / exclude on a range had to be done by setting > the bit in 'mode' before setting the range. However, setting this > bit also had the effect of altering the current range as well. > > Changed to only set include / exclude setting of a range at the point of > setting that range. Either use a 3rd input parameter as the include exclude > value, or if not present use the current value of 'mode'. Do not change > current range when 'mode' changes. > > 2) Context ID and VM ID masks required 2 value inputs, even when the > second value is ignored as insufficient CID / VMID comparators are > implemented. > Permit a single value to be used if that is sufficient to cover all > implemented comparators. > > Signed-off-by: Mike Leach > --- > .../coresight/coresight-etm4x-sysfs.c | 24 +++++++++++++------ > 1 file changed, 17 insertions(+), 7 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > index 3bcc260c9e55..baac5b48b7ac 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > @@ -297,8 +297,6 @@ static ssize_t mode_store(struct device *dev, > > spin_lock(&drvdata->spinlock); > config->mode = val & ETMv4_MODE_ALL; > - etm4_set_mode_exclude(drvdata, > - config->mode & ETM_MODE_EXCLUDE ? true : false); > > if (drvdata->instrp0 == true) { > /* start by clearing instruction P0 field */ > @@ -972,8 +970,12 @@ static ssize_t addr_range_store(struct device *dev, > unsigned long val1, val2; > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > struct etmv4_config *config = &drvdata->config; > + int elements, exclude; > > - if (sscanf(buf, "%lx %lx", &val1, &val2) != 2) > + elements = sscanf(buf, "%lx %lx %x", &val1, &val2, &exclude); > + > + /* exclude is optional, but need at least two parameter */ > + if (elements < 2) > return -EINVAL; > /* lower address comparator cannot have a higher address value */ > if (val1 > val2) > @@ -1001,9 +1003,11 @@ static ssize_t addr_range_store(struct device *dev, > /* > * Program include or exclude control bits for vinst or vdata > * whenever we change addr comparators to ETM_ADDR_TYPE_RANGE > + * use supplied value, or default to bit set in 'mode' > */ > - etm4_set_mode_exclude(drvdata, > - config->mode & ETM_MODE_EXCLUDE ? true : false); > + if (elements != 3) > + exclude = config->mode & ETM_MODE_EXCLUDE; > + etm4_set_mode_exclude(drvdata, exclude ? true : false); > > spin_unlock(&drvdata->spinlock); > return size; > @@ -1787,6 +1791,7 @@ static ssize_t ctxid_masks_store(struct device *dev, > unsigned long val1, val2, mask; > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > struct etmv4_config *config = &drvdata->config; > + int nr_inputs; > > /* > * Don't use contextID tracing if coming from a PID namespace. See > @@ -1802,7 +1807,9 @@ static ssize_t ctxid_masks_store(struct device *dev, > */ > if (!drvdata->ctxid_size || !drvdata->numcidc) > return -EINVAL; > - if (sscanf(buf, "%lx %lx", &val1, &val2) != 2) > + /* one mask if < 4 comparators, two for up to 8 */ One maks is <= 4 comparators. > + nr_inputs = sscanf(buf, "%lx %lx", &val1, &val2); > + if ((drvdata->numcidc > 4) && (nr_inputs != 2)) > return -EINVAL; > > spin_lock(&drvdata->spinlock); > @@ -1976,6 +1983,7 @@ static ssize_t vmid_masks_store(struct device *dev, > unsigned long val1, val2, mask; > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > struct etmv4_config *config = &drvdata->config; > + int nr_inputs; > > /* > * only implemented when vmid tracing is enabled, i.e. at least one > @@ -1983,7 +1991,9 @@ static ssize_t vmid_masks_store(struct device *dev, > */ > if (!drvdata->vmid_size || !drvdata->numvmidc) > return -EINVAL; > - if (sscanf(buf, "%lx %lx", &val1, &val2) != 2) > + /* one mask if < 4 comparators, two for up to 8 */ One maks is <= 4 comparators. > + nr_inputs = sscanf(buf, "%lx %lx", &val1, &val2); > + if ((drvdata->numvmidc > 4) && (nr_inputs != 2)) > return -EINVAL; > > spin_lock(&drvdata->spinlock); > -- > 2.17.1 > > _______________________________________________ > CoreSight mailing list > CoreSight@lists.linaro.org > https://lists.linaro.org/mailman/listinfo/coresight _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel