[PATCH v4 08/10] coresight-tpdm: Add timestamp control register support for the CMB
Suzuki K Poulose
suzuki.poulose at arm.com
Wed Jan 24 04:07:57 PST 2024
On 19/01/2024 03:23, 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 | 123 +++++++++++++++++-
> drivers/hwtracing/coresight/coresight-tpdm.h | 31 +++++
> 3 files changed, 182 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 898aee81e20d..2199ea9d731e 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
Date and version change, as in the previous patch.
> +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 079c875ad667..184711c946f1 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -321,6 +321,31 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
> }
> }
>
> +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;
> +
> + /* Set trigger timestamp */
> + if (drvdata->cmb->trig_ts)
> + val |= TPDM_CMB_TIER_XTRIG_TSENAB;
> +
> + /* Set all timestamp enablement*/
> + if (drvdata->cmb->ts_all)
> + 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;
> @@ -338,6 +363,8 @@ 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,
> @@ -687,9 +714,20 @@ static ssize_t enable_ts_show(struct device *dev,
> char *buf)
> {
> struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> + struct tpdm_dataset_attribute *tpdm_attr =
> + container_of(attr, struct tpdm_dataset_attribute, attr);
> + ssize_t size = 0;
super minor nit:
ssize_t size = -EINVAL;
> +
> + if (tpdm_attr->mem == DSB_PATT)
> + size = sysfs_emit(buf, "%u\n",
> + (unsigned int)drvdata->dsb->patt_ts);
> + else if (tpdm_attr->mem == CMB_PATT)
> + size = sysfs_emit(buf, "%u\n",
> + (unsigned int)drvdata->cmb->patt_ts);
and drop the below.
--- cut here ---
> + else
> + return -EINVAL;
>
--- end ---
> - return sysfs_emit(buf, "%u\n",
> - (unsigned int)drvdata->dsb->patt_ts);
> + return size;
> }
>
> /*
> @@ -701,17 +739,23 @@ static ssize_t enable_ts_store(struct device *dev,
> size_t size)
> {
> struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> + struct tpdm_dataset_attribute *tpdm_attr =
> + container_of(attr, struct tpdm_dataset_attribute, attr);
> unsigned long val;
>
> if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
> return -EINVAL;
>
> - spin_lock(&drvdata->spinlock);
> - drvdata->dsb->patt_ts = !!val;
> - spin_unlock(&drvdata->spinlock);
> + guard(spinlock)(&drvdata->spinlock);
> + if (tpdm_attr->mem == DSB_PATT)
> + drvdata->dsb->patt_ts = !!val;
> + else if (tpdm_attr->mem == CMB_PATT)
> + drvdata->cmb->patt_ts = !!val;
> + else
> + return -EINVAL;
> +
> return size;
> }
> -static DEVICE_ATTR_RW(enable_ts);
>
> static ssize_t set_type_show(struct device *dev,
> struct device_attribute *attr,
> @@ -843,6 +887,68 @@ 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);
minor nit: Use guard(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);
minor nit: Use guard(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,
> @@ -911,7 +1017,7 @@ static struct attribute *tpdm_dsb_patt_attrs[] = {
> DSB_PATT_MASK_ATTR(5),
> DSB_PATT_MASK_ATTR(6),
> DSB_PATT_MASK_ATTR(7),
> - &dev_attr_enable_ts.attr,
> + DSB_PATT_ENABLE_TS,
> &dev_attr_set_type.attr,
> NULL,
> };
> @@ -965,6 +1071,7 @@ static struct attribute *tpdm_cmb_patt_attrs[] = {
> CMB_PATT_ATTR(1),
> CMB_PATT_MASK_ATTR(0),
> CMB_PATT_MASK_ATTR(1),
> + CMB_PATT_ENABLE_TS,
> NULL,
> };
>
> @@ -977,6 +1084,8 @@ 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 8cb8a9b35384..a49a4215ba63 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
> @@ -134,6 +142,15 @@
> } \
> })[0].attr.attr)
>
> +#define tpdm_patt_enable_ts_rw(name, mem) \
minor nit: you could drop _rw
> + (&((struct tpdm_dataset_attribute[]) { \
> + { \
> + __ATTR(name, 0644, enable_ts_show, \
> + enable_ts_store), \
> + mem, \
> + } \
> + })[0].attr.attr)
> +
> #define DSB_EDGE_CTRL_ATTR(nr) \
> tpdm_simple_dataset_ro(edcr##nr, \
> DSB_EDGE_CTRL, nr)
> @@ -158,6 +175,10 @@
> tpdm_simple_dataset_rw(tpmr##nr, \
> DSB_PATT_MASK, nr)
>
> +#define DSB_PATT_ENABLE_TS \
> + tpdm_patt_enable_ts_rw(enable_ts, \
> + DSB_PATT)
> +
> #define DSB_MSR_ATTR(nr) \
> tpdm_simple_dataset_rw(msr##nr, \
> DSB_MSR, nr)
> @@ -178,6 +199,10 @@
> tpdm_simple_dataset_rw(tpmr##nr, \
> CMB_PATT_MASK, nr)
>
> +#define CMB_PATT_ENABLE_TS \
> + tpdm_patt_enable_ts_rw(enable_ts, \
> + CMB_PATT)
> +
> /**
> * struct dsb_dataset - specifics associated to dsb dataset
> * @mode: DSB programming mode
> @@ -217,6 +242,9 @@ 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 +252,9 @@ 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;
> };
Rest looks fine to me
Suzuki
>
> /**
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