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Date: Fri, 19 Jan 2024 11:53:51 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Tao Zhang <quic_taozha@...cinc.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Konrad Dybcio <konradybcio@...il.com>, Mike Leach <mike.leach@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: Jinlong Mao <quic_jinlmao@...cinc.com>, Leo Yan <leo.yan@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Tingwei Zhang <quic_tingweiz@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>, Song Chai <quic_songchai@...cinc.com>,
linux-arm-msm@...r.kernel.org, andersson@...nel.org
Subject: Re: [PATCH v4 06/10] coresight-tpdm: Add support to configure CMB
On 19/01/2024 03:22, Tao Zhang wrote:
> TPDM CMB subunits support two forms of CMB data set element creation:
> continuous and trace-on-change collection mode. Continuous change
> creates CMB data set elements on every CMBCLK edge. Trace-on-change
> creates CMB data set elements only when a new data set element differs
> in value from the previous element in a CMB data set. Set CMB_CR.MODE
> to 0 for continuous CMB collection mode. Set CMB_CR.MODE to 1 for
> trace-on-change CMB collection mode.
>
> Reviewed-by: James Clark <james.clark@....com>
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> Signed-off-by: Jinlong Mao <quic_jinlmao@...cinc.com>
> ---
> .../testing/sysfs-bus-coresight-devices-tpdm | 14 +++++
> drivers/hwtracing/coresight/coresight-tpdm.c | 61 +++++++++++++++++++
> drivers/hwtracing/coresight/coresight-tpdm.h | 12 ++++
> 3 files changed, 87 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 4dd49b159543..3ae21ccf3f29 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -170,3 +170,17 @@ Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_t
> Description:
> (RW) Set/Get the MSR(mux select register) for the DSB subunit
> TPDM.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/cmb_mode
> +Date: March 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
> +Description: (Write) Set the data collection mode of CMB tpdm. Continuous
> + change creates CMB data set elements on every CMBCLK edge.
> + Trace-on-change creates CMB data set elements only when a new
> + data set element differs in value from the previous element
> + in a CMB data set.
> +
> + Accepts only one of the 2 values - 0 or 1.
> + 0 : Continuous CMB collection mode.
> + 1 : Trace-on-change CMB collection mode.
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 424a2f724d82..b55aee65a856 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -137,6 +137,18 @@ static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
> return 0;
> }
>
> +static umode_t tpdm_cmb_is_visible(struct kobject *kobj,
> + struct attribute *attr, int n)
> +{
> + struct device *dev = kobj_to_dev(kobj);
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> + if (drvdata && tpdm_has_cmb_dataset(drvdata))
> + return attr->mode;
> +
> + return 0;
> +}
> +
> static umode_t tpdm_dsb_msr_is_visible(struct kobject *kobj,
> struct attribute *attr, int n)
> {
> @@ -161,6 +173,9 @@ static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
> drvdata->dsb->trig_ts = true;
> drvdata->dsb->trig_type = false;
> }
> +
> + if (tpdm_has_cmb_dataset(drvdata))
This could simply be gated on drvdata->cmb for extra safety ?
if (drvdata->cmb)
> + memset(drvdata->cmb, 0, sizeof(struct cmb_dataset));
> }
>
> static void set_dsb_mode(struct tpdm_drvdata *drvdata, u32 *val)
> @@ -389,6 +404,12 @@ static int tpdm_datasets_setup(struct tpdm_drvdata *drvdata)
> if (!drvdata->dsb)
> return -ENOMEM;
> }
> + if (tpdm_has_cmb_dataset(drvdata) && (!drvdata->cmb)) {
> + drvdata->cmb = devm_kzalloc(drvdata->dev,
> + sizeof(*drvdata->cmb), GFP_KERNEL);
> + if (!drvdata->cmb)
> + return -ENOMEM;
> + }
> tpdm_reset_datasets(drvdata);
>
> return 0;
> @@ -727,6 +748,35 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
> }
> static DEVICE_ATTR_RW(dsb_trig_ts);
>
> +static ssize_t cmb_mode_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> + return sysfs_emit(buf, "%x\n",
> + drvdata->cmb->trace_mode);
minor nit: Don't need to split the line here. Also, for completeness,
you need to read it under spinlock, use guard() to unlock implicitly.
> +
> +}
> +
> +static ssize_t cmb_mode_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t size)
> +{
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> + unsigned long trace_mode;
> +
> + if ((kstrtoul(buf, 0, &trace_mode)) || (trace_mode & ~1UL))
minor nit: drop () around kstrtoul()
Rest looks fine.
Suzuki
> + return -EINVAL;
> +
> + spin_lock(&drvdata->spinlock);
> + drvdata->cmb->trace_mode = trace_mode;
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +static DEVICE_ATTR_RW(cmb_mode);
> +
> static struct attribute *tpdm_dsb_edge_attrs[] = {
> &dev_attr_ctrl_idx.attr,
> &dev_attr_ctrl_val.attr,
> @@ -843,6 +893,11 @@ static struct attribute *tpdm_dsb_attrs[] = {
> NULL,
> };
>
> +static struct attribute *tpdm_cmb_attrs[] = {
> + &dev_attr_cmb_mode.attr,
> + NULL,
> +};
> +
> static struct attribute_group tpdm_dsb_attr_grp = {
> .attrs = tpdm_dsb_attrs,
> .is_visible = tpdm_dsb_is_visible,
> @@ -872,6 +927,11 @@ static struct attribute_group tpdm_dsb_msr_grp = {
> .name = "dsb_msr",
> };
>
> +static struct attribute_group tpdm_cmb_attr_grp = {
> + .attrs = tpdm_cmb_attrs,
> + .is_visible = tpdm_cmb_is_visible,
> +};
> +
> static const struct attribute_group *tpdm_attr_grps[] = {
> &tpdm_attr_grp,
> &tpdm_dsb_attr_grp,
> @@ -879,6 +939,7 @@ static const struct attribute_group *tpdm_attr_grps[] = {
> &tpdm_dsb_trig_patt_grp,
> &tpdm_dsb_patt_grp,
> &tpdm_dsb_msr_grp,
> + &tpdm_cmb_attr_grp,
> NULL,
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index a442d9c6e4ac..2af92c270ed1 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -14,6 +14,8 @@
>
> /* Enable bit for CMB subunit */
> #define TPDM_CMB_CR_ENA BIT(0)
> +/* Trace collection mode for CMB subunit */
> +#define TPDM_CMB_CR_MODE BIT(1)
>
> /* DSB Subunit Registers */
> #define TPDM_DSB_CR (0x780)
> @@ -181,6 +183,14 @@ struct dsb_dataset {
> bool trig_type;
> };
>
> +/**
> + * struct cmb_dataset
> + * @trace_mode: Dataset collection mode
> + */
> +struct cmb_dataset {
> + u32 trace_mode;
> +};
> +
> /**
> * struct tpdm_drvdata - specifics associated to an TPDM component
> * @base: memory mapped base address for this component.
> @@ -190,6 +200,7 @@ struct dsb_dataset {
> * @enable: enable status of the component.
> * @datasets: The datasets types present of the TPDM.
> * @dsb Specifics associated to TPDM DSB.
> + * @cmb Specifics associated to TPDM CMB.
> * @dsb_msr_num Number of MSR supported by DSB TPDM
> */
>
> @@ -201,6 +212,7 @@ struct tpdm_drvdata {
> bool enable;
> unsigned long datasets;
> struct dsb_dataset *dsb;
> + struct cmb_dataset *cmb;
> u32 dsb_msr_num;
> };
>
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