Re: [PATCH v4 08/10] coresight-tpdm: Add timestamp control register support for the CMB
From: Suzuki K Poulose
Date: Wed Jan 24 2024 - 07:12:43 EST
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@xxxxxxx>
Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
Signed-off-by: Jinlong Mao <quic_jinlmao@xxxxxxxxxxx>
---
.../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@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
Date and version change, as in the previous patch.
+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 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
/**