Re: [PATCH v2 6/8] coresight-tpdm: Add timestamp control register support for the CMB

From: James Clark
Date: Mon Oct 30 2023 - 07:37:46 EST

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In reply to: Tao Zhang: "[PATCH v2 6/8] coresight-tpdm: Add timestamp control register support for the CMB"
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On 25/10/2023 03:53, Tao Zhang wrote:
> CMB_TIER register is CMB subunit timestamp insertion enable register.
> Bit 0 is PATT_TSENAB bit. Set this bit to 1 to request a timestamp
> following a CMB interface pattern match. Bit 1 is XTRIG_TSENAB bit.
> Set this bit to 1 to request a timestamp following a CMB CTI timestamp
> request. Bit 2 is TS_ALL bit. Set this bit to 1 to request timestamp
> for all packets.
>
> Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
> Signed-off-by: Jinlong Mao <quic_jinlmao@xxxxxxxxxxx>
> ---
> .../ABI/testing/sysfs-bus-coresight-devices-tpdm | 35 +++++++
> drivers/hwtracing/coresight/coresight-tpdm.c | 116 ++++++++++++++++++++-
> drivers/hwtracing/coresight/coresight-tpdm.h | 14 +++
> 3 files changed, 162 insertions(+), 3 deletions(-)
>

Reviewed-by: James Clark <james.clark@xxxxxxx>

> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index c17468f..d58b33ee 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -210,3 +210,38 @@ KernelVersion 6.7
> Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> Description:
> (RW) Set/Get the mask of the pattern for the CMB subunit TPDM.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/cmb_patt/enable_ts
> +Date: September 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> +Description:
> + (Write) Set the pattern timestamp of CMB tpdm. Read
> + the pattern timestamp of CMB tpdm.
> +
> + Accepts only one of the 2 values - 0 or 1.
> + 0 : Disable CMB pattern timestamp.
> + 1 : Enable CMB pattern timestamp.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_ts
> +Date: September 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> +Description:
> + (RW) Set/Get the trigger timestamp of the CMB for tpdm.
> +
> + Accepts only one of the 2 values - 0 or 1.
> + 0 : Set the CMB trigger type to false
> + 1 : Set the CMB trigger type to true
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/cmb_ts_all
> +Date: September 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> +Description:
> + (RW) Read or write the status of timestamp upon all interface.
> + Only value 0 and 1 can be written to this node. Set this node to 1 to requeset
> + timestamp to all trace packet.
> + Accepts only one of the 2 values - 0 or 1.
> + 0 : Disable the timestamp of all trace packets.
> + 1 : Enable the timestamp of all trace packets.
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 894d430..f6cda56 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -331,6 +331,36 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
> writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
> }
>
> +static void set_cmb_tier(struct tpdm_drvdata *drvdata)
> +{
> + u32 val;
> +
> + val = readl_relaxed(drvdata->base + TPDM_CMB_TIER);
> +
> + /* Clear all relevant fields */
> + val &= ~(TPDM_CMB_TIER_PATT_TSENAB | TPDM_CMB_TIER_TS_ALL |
> + TPDM_CMB_TIER_XTRIG_TSENAB);
> +
> + /* Set pattern timestamp type and enablement */
> + if (drvdata->cmb->patt_ts)
> + val |= TPDM_CMB_TIER_PATT_TSENAB;
> + else
> + val &= ~TPDM_CMB_TIER_PATT_TSENAB;
> +
> + /* Set trigger timestamp */
> + if (drvdata->cmb->trig_ts)
> + val |= TPDM_CMB_TIER_XTRIG_TSENAB;
> + else
> + val &= ~TPDM_CMB_TIER_XTRIG_TSENAB;
> +
> + /* Set all timestamp enablement*/
> + if (drvdata->cmb->ts_all)
> + val |= TPDM_CMB_TIER_TS_ALL;
> + else
> + val &= ~TPDM_CMB_TIER_TS_ALL;
> + writel_relaxed(val, drvdata->base + TPDM_CMB_TIER);
> +}
> +
> static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
> {
> u32 val, i;
> @@ -347,6 +377,8 @@ static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
> drvdata->base + TPDM_CMB_XPMR(i));
> }
>
> + set_cmb_tier(drvdata);
> +
> val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
> /*
> * Set to 0 for continuous CMB collection mode,
> @@ -695,9 +727,17 @@ static ssize_t enable_ts_show(struct device *dev,
> char *buf)
> {
> struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> + ssize_t size = 0;
>
> - return sysfs_emit(buf, "%u\n",
> - (unsigned int)drvdata->dsb->patt_ts);
> + if (tpdm_has_dsb_dataset(drvdata))
> + size = sysfs_emit(buf, "%u\n",
> + (unsigned int)drvdata->dsb->patt_ts);
> +
> + if (tpdm_has_cmb_dataset(drvdata))
> + size = sysfs_emit(buf, "%u\n",
> + (unsigned int)drvdata->cmb->patt_ts);
> +
> + return size;
> }
>
> /*
> @@ -715,8 +755,13 @@ static ssize_t enable_ts_store(struct device *dev,
> return -EINVAL;
>
> spin_lock(&drvdata->spinlock);
> - drvdata->dsb->patt_ts = !!val;
> + if (tpdm_has_dsb_dataset(drvdata))
> + drvdata->dsb->patt_ts = !!val;
> +
> + if (tpdm_has_cmb_dataset(drvdata))
> + drvdata->cmb->patt_ts = !!val;
> spin_unlock(&drvdata->spinlock);
> +
> return size;
> }
> static DEVICE_ATTR_RW(enable_ts);
> @@ -851,6 +896,68 @@ static ssize_t cmb_mode_store(struct device *dev,
> }
> static DEVICE_ATTR_RW(cmb_mode);
>
> +static ssize_t cmb_ts_all_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> + return sysfs_emit(buf, "%u\n",
> + (unsigned int)drvdata->cmb->ts_all);
> +}
> +
> +static ssize_t cmb_ts_all_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 val;
> +
> + if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
> + return -EINVAL;
> +
> + spin_lock(&drvdata->spinlock);
> + if (val)
> + drvdata->cmb->ts_all = true;
> + else
> + drvdata->cmb->ts_all = false;
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +static DEVICE_ATTR_RW(cmb_ts_all);
> +
> +static ssize_t cmb_trig_ts_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> + return sysfs_emit(buf, "%u\n",
> + (unsigned int)drvdata->cmb->trig_ts);
> +}
> +
> +static ssize_t cmb_trig_ts_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 val;
> +
> + if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
> + return -EINVAL;
> +
> + spin_lock(&drvdata->spinlock);
> + if (val)
> + drvdata->cmb->trig_ts = true;
> + else
> + drvdata->cmb->trig_ts = false;
> + spin_unlock(&drvdata->spinlock);
> + return size;
> +}
> +static DEVICE_ATTR_RW(cmb_trig_ts);
> +
> static struct attribute *tpdm_dsb_edge_attrs[] = {
> &dev_attr_ctrl_idx.attr,
> &dev_attr_ctrl_val.attr,
> @@ -973,6 +1080,7 @@ static struct attribute *tpdm_cmb_patt_attrs[] = {
> CMB_PATT_ATTR(1),
> CMB_PATT_MASK_ATTR(0),
> CMB_PATT_MASK_ATTR(1),
> + &dev_attr_enable_ts.attr,
> NULL,
> };
>
> @@ -985,6 +1093,8 @@ static struct attribute *tpdm_dsb_attrs[] = {
>
> static struct attribute *tpdm_cmb_attrs[] = {
> &dev_attr_cmb_mode.attr,
> + &dev_attr_cmb_ts_all.attr,
> + &dev_attr_cmb_trig_ts.attr,
> NULL,
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index e90d008c..65b7ca6 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -11,6 +11,8 @@
>
> /* CMB Subunit Registers */
> #define TPDM_CMB_CR (0xA00)
> +/*CMB subunit timestamp insertion enable register*/
> +#define TPDM_CMB_TIER (0xA04)
> /*CMB subunit timestamp pattern registers*/
> #define TPDM_CMB_TPR(n) (0xA08 + (n * 4))
> /*CMB subunit timestamp pattern mask registers*/
> @@ -24,6 +26,12 @@
> #define TPDM_CMB_CR_ENA BIT(0)
> /* Trace collection mode for CMB subunit */
> #define TPDM_CMB_CR_MODE BIT(1)
> +/* Timestamp control for pattern match */
> +#define TPDM_CMB_TIER_PATT_TSENAB BIT(0)
> +/* CMB CTI timestamp request */
> +#define TPDM_CMB_TIER_XTRIG_TSENAB BIT(1)
> +/* For timestamp fo all trace */
> +#define TPDM_CMB_TIER_TS_ALL BIT(2)
>
> /*Patten register number*/
> #define TPDM_CMB_MAX_PATT 2
> @@ -217,6 +225,9 @@ struct dsb_dataset {
> * @patt_mask: Save value for pattern mask
> * @trig_patt: Save value for trigger pattern
> * @trig_patt_mask: Save value for trigger pattern mask
> + * @patt_ts: Indicates if pattern match for timestamp is enabled.
> + * @trig_ts: Indicates if CTI trigger for timestamp is enabled.
> + * @ts_all: Indicates if timestamp is enabled for all packets.
> */
> struct cmb_dataset {
> u32 trace_mode;
> @@ -224,6 +235,9 @@ struct cmb_dataset {
> u32 patt_mask[TPDM_CMB_MAX_PATT];
> u32 trig_patt[TPDM_CMB_MAX_PATT];
> u32 trig_patt_mask[TPDM_CMB_MAX_PATT];
> + bool patt_ts;
> + bool trig_ts;
> + bool ts_all;
> };
>
> /**

Next message: Federico Vaga: "Re: [PATCH] docs: translations: add translations links when they exist"
Previous message: Bagas Sanjaya: "Re: [PATCH Resend] Fix line Length"
In reply to: Tao Zhang: "[PATCH v2 6/8] coresight-tpdm: Add timestamp control register support for the CMB"
Next in thread: Tao Zhang: "[PATCH v2 7/8] dt-bindings: arm: Add support for TPDM CMB MSR register"
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