Re: [PATCH 9/9] coresight-tpdm: Add nodes for timestamp request

Suzuki K Poulose
2022-10-25T10:07:21Z

On 08/09/2022 09:45, Tao Zhang wrote:
> Add nodes to configure the timestamp request based on input
> pattern match. Each TPDM that support DSB subunit has n(0-7) TPR
> registers to configure value for timestamp request based on input
> pattern match, and has m(0-7) TPMR registers to configure pattern
> mask for timestamp request.
> Add nodes to enable/disable pattern timestamp and set pattern
> timestamp type.
>
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
> drivers/hwtracing/coresight/coresight-tpdm.c | 189 +++++++++++++++++++++++++++
> drivers/hwtracing/coresight/coresight-tpdm.h | 14 ++
> 2 files changed, 203 insertions(+)
>
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 648bbe6..4212ff4 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -32,6 +32,13 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
> drvdata->base + TPDM_DSB_EDCMR(i));
>
> for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> + writel_relaxed(drvdata->dsb->patt_val[i],
> + drvdata->base + TPDM_DSB_TPR(i));
> + writel_relaxed(drvdata->dsb->patt_mask[i],
> + drvdata->base + TPDM_DSB_TPMR(i));
> + }
> +
> + for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> writel_relaxed(drvdata->dsb->trig_patt_val[i],
> drvdata->base + TPDM_DSB_XPR(i));
> writel_relaxed(drvdata->dsb->trig_patt_mask[i],
> @@ -39,6 +46,16 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
> }
>
> val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
> + /* Set pattern timestamp type and enablement */
> + if (drvdata->dsb->patt_ts) {
> + val |= TPDM_DSB_PATT_TSENAB;
> + if (drvdata->dsb->patt_type)
> + val |= TPDM_DSB_PATT_TYPE;
> + else
> + val &= ~TPDM_DSB_PATT_TYPE;
> + } else {
> + val &= ~TPDM_DSB_PATT_TSENAB;
> + }
> /* Set trigger timestamp */
> if (drvdata->dsb->trig_ts)
> val |= TPDM_DSB_XTRIG_TSENAB;
> @@ -411,6 +428,174 @@ static ssize_t dsb_edge_ctrl_mask_store(struct device *dev,
> }
> static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
>
> +static ssize_t dsb_patt_val_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> + ssize_t size = 0;
> + int i = 0;
> +
> + if (!(drvdata->datasets & TPDM_PIDR0_DS_DSB))
> + return -EPERM;
> +
> + spin_lock(&drvdata->spinlock);
> + for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> + size += scnprintf(buf + size, PAGE_SIZE - size,
> + "Index: 0x%x Value: 0x%x\n", i,
> + drvdata->dsb->patt_val[i]);
> + }
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +
> +/*
> + * value 1: Index of TPR register
> + * value 2: Value need to be written
> + */
> +static ssize_t dsb_patt_val_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 index, val;
> +
> + if (sscanf(buf, "%lx %lx", &index, &val) != 2)
> + return -EINVAL;
> + if (!(drvdata->datasets & TPDM_PIDR0_DS_DSB) ||
> + index >= TPDM_DSB_MAX_PATT)
> + return -EPERM;
> +
> + spin_lock(&drvdata->spinlock);
> + drvdata->dsb->patt_val[index] = val;
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +static DEVICE_ATTR_RW(dsb_patt_val);
> +
> +static ssize_t dsb_patt_mask_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> + ssize_t size = 0;
> + int i = 0;
> +
> + if (!(drvdata->datasets & TPDM_PIDR0_DS_DSB))
> + return -EPERM;
> +
> + spin_lock(&drvdata->spinlock);
> + for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> + size += scnprintf(buf + size, PAGE_SIZE - size,
> + "Index: 0x%x Value: 0x%x\n", i,
> + drvdata->dsb->patt_mask[i]);
> + }
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +
> +/*
> + * value 1: Index of TPMR register
> + * value 2: Value need to be written
> + */
> +static ssize_t dsb_patt_mask_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 index, val;
> +
> + if (sscanf(buf, "%lx %lx", &index, &val) != 2)
> + return -EINVAL;
> + if (!(drvdata->datasets & TPDM_PIDR0_DS_DSB) ||
> + index >= TPDM_DSB_MAX_PATT)
> + return -EPERM;
> +
> + spin_lock(&drvdata->spinlock);
> + drvdata->dsb->patt_mask[index] = val;
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +static DEVICE_ATTR_RW(dsb_patt_mask);
> +
> +static ssize_t dsb_patt_ts_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> + if (!(drvdata->datasets & TPDM_PIDR0_DS_DSB))
> + return -EPERM;
> +
> + return scnprintf(buf, PAGE_SIZE, "%u\n",
> + (unsigned int)drvdata->dsb->patt_ts);

Please use sysfs_emit() everywhere (in the previous patches too)
for such operations.

I have finished reviewing this series.

Suzuki