[PATCH v3 6/8] coresight-tpdm: Add timestamp control register support for the CMB
Tao Zhang
quic_taozha at quicinc.com
Mon Dec 18 18:43:19 PST 2023
On 12/18/2023 6:46 PM, Suzuki K Poulose wrote:
> On 21/11/2023 02:24, 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.
>>
>> Reviewed-by: James Clark <james.clark at arm.com>
>> Signed-off-by: Tao Zhang <quic_taozha at quicinc.com>
>> Signed-off-by: Jinlong Mao <quic_jinlmao at quicinc.com>
>> ---
>> .../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(-)
>>
>> diff --git
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 53662ce7c2d0..e0b77107be13 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -214,3 +214,38 @@ KernelVersion 6.7
>> Contact: Jinlong Mao (QUIC) <quic_jinlmao at quicinc.com>, Tao
>> Zhang (QUIC) <quic_taozha at quicinc.com>
>> 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 at quicinc.com>, Tao Zhang
>> (QUIC) <quic_taozha at quicinc.com>
>> +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 at quicinc.com>, Tao Zhang
>> (QUIC) <quic_taozha at quicinc.com>
>> +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 at quicinc.com>, Tao Zhang
>> (QUIC) <quic_taozha at quicinc.com>
>> +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 894d4309f1c7..f6cda5616e84 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;
>
> -- cut --
>> + else
>> + val &= ~TPDM_CMB_TIER_PATT_TSENAB;
>
>
> All the else cases in this function are superfluous. Please remove all
> of them.
I will update this in the next patch.
>
>> +
>> + /* 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);
>
> Why does this need to show two values ? This must only show ONE value.
> How you deduce that might be based on the availability of the feature
> set. Or store the TS value in the drvdata and use that instead for
> controlling CMB/DSB.
Since both of CMB/DSB need to have "enable_ts" SysFs file, can I
separate them
as "enable_dsb_ts" and "enable_cmb_ts"? The path will be like below.
tpdm0/dsb_patt/enable_dsb_ts
tpdm1/cmb_patt/enable_cmb_ts
Is this design appropriate?
>
> Also, the sysfs documentation needs update, if this is going to
> control the CMB.
Sure. I will update the SysFs documentation according to the
modification in the
next patch series.
Best,
Tao
>
> Suzuki
>
>
>> +
>> + 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 e90d008c1cb2..65b7ca6c4077 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;
>> };
>> /**
>
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