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SubjectRe: [PATCH v4 08/11] coresight-tpdm: Add nodes to configure pattern match output
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On 27/04/2023 10:00, Tao Zhang wrote:
> Add nodes to configure trigger pattern and trigger pattern mask.
> Each DSB subunit TPDM has maximum of n(n<7) XPR registers to
> configure trigger pattern match output. Eight 32 bit registers
> providing DSB interface trigger output pattern match comparison.
> And each DSB subunit TPDM has maximum of m(m<7) XPMR registers to
> configure trigger pattern mask match output. Eight 32 bit
> registers providing DSB interface trigger output pattern match
> mask.
>
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
> .../ABI/testing/sysfs-bus-coresight-devices-tpdm | 30 ++++++++
> drivers/hwtracing/coresight/coresight-tpdm.c | 85 ++++++++++++++++++++++
> drivers/hwtracing/coresight/coresight-tpdm.h | 8 ++
> 3 files changed, 123 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index a57f000..c04c735 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -92,3 +92,33 @@ Description:
> <integer1> : Start EDCMR register number
> <integer2> : End EDCMR register number
> <integer3> : The value need to be written
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_val
> +Date: March 2023
> +KernelVersion 6.3
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> + (Write) Set the trigger pattern value of DSB tpdm.
> + Read the trigger pattern value of DSB tpdm.
> +
> + Expected format is the following:
> + <integer1> <integer2>
> +
> + Where:
> + <integer1> : Index number of XPR register, the range is 0 to 7
> + <integer2> : The value need to be written

I assume the values written to the registers are not special and doesn't
have meaning and thus need not be documented ?

> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_mask
> +Date: March 2023
> +KernelVersion 6.3

Same as the previous one, 6.5 please

> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> + (Write) Set the trigger pattern mask of DSB tpdm.
> + Read the trigger pattern mask of DSB tpdm.
> +
> + Expected format is the following:
> + <integer1> <integer2>
> +
> + Where:
> + <integer1> : Index number of XPMR register, the range is 0 to 7
> + <integer2> : The value need to be written
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index a40e458..9387bdf 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -89,6 +89,13 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
> writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
> drvdata->base + TPDM_DSB_EDCMR(i));
>
> + for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {

Same as the previous, can we safely assume that write to these
registers won't trigger an Error if not impelemented ?

> + writel_relaxed(drvdata->dsb->trig_patt_val[i],
> + drvdata->base + TPDM_DSB_XPR(i));
> + writel_relaxed(drvdata->dsb->trig_patt_mask[i],
> + drvdata->base + TPDM_DSB_XPMR(i));
> + }
> +
> val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
> /* Set trigger timestamp */
> if (drvdata->dsb->trig_ts)
> @@ -444,6 +451,82 @@ static ssize_t dsb_edge_ctrl_mask_store(struct device *dev,
> }
> static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
>
> +static ssize_t dsb_trig_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;
> +
> + spin_lock(&drvdata->spinlock);
> + for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> + size += sysfs_emit_at(buf, size,
> + "Index: 0x%x Value: 0x%x\n", i,
> + drvdata->dsb->trig_patt_val[i]);

Please detect the return of 0 and break. Same below.


> + }
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +
> +static ssize_t dsb_trig_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 (index >= TPDM_DSB_MAX_PATT)
> + return -EPERM;
> +
> + spin_lock(&drvdata->spinlock);
> + drvdata->dsb->trig_patt_val[index] = val;
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +static DEVICE_ATTR_RW(dsb_trig_patt_val);
> +
> +static ssize_t dsb_trig_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;
> +
> + spin_lock(&drvdata->spinlock);
> + for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> + size += sysfs_emit_at(buf, size,
> + "Index: 0x%x Value: 0x%x\n", i,
> + drvdata->dsb->trig_patt_mask[i]);
> + }
> + spin_unlock(&drvdata->spinlock);
> + return size;

Suzuki

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