coresight-tpdm: Add nodes to configure pattern match output

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>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/1695882586-10306-11-git-send-email-quic_taozha@quicinc.com

Author: Tao Zhang

Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm

@@ -107,4 +107,20 @@ Date:		March 2023
 KernelVersion	6.7
 Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
 Description:
-		Read a set of the edge control mask of the DSB in TPDM.
+		Read a set of the edge control mask of the DSB in TPDM.
+
+What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpr[0:7]
+Date:		March 2023
+KernelVersion	6.7
+Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
+Description:
+		(RW) Set/Get the value of the trigger pattern for the DSB
+		subunit TPDM.
+
+What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpmr[0:7]
+Date:		March 2023
+KernelVersion	6.7
+Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
+Description:
+		(RW) Set/Get the mask of the trigger pattern for the DSB
+		subunit TPDM.

drivers/hwtracing/coresight/coresight-tpdm.c

@@ -41,10 +41,58 @@ static ssize_t tpdm_simple_dataset_show(struct device *dev,
 			return -EINVAL;
 		return sysfs_emit(buf, "0x%x\n",
 			drvdata->dsb->edge_ctrl_mask[tpdm_attr->idx]);
+	case DSB_TRIG_PATT:
+		if (tpdm_attr->idx >= TPDM_DSB_MAX_PATT)
+			return -EINVAL;
+		return sysfs_emit(buf, "0x%x\n",
+			drvdata->dsb->trig_patt[tpdm_attr->idx]);
+	case DSB_TRIG_PATT_MASK:
+		if (tpdm_attr->idx >= TPDM_DSB_MAX_PATT)
+			return -EINVAL;
+		return sysfs_emit(buf, "0x%x\n",
+			drvdata->dsb->trig_patt_mask[tpdm_attr->idx]);
 	}
 	return -EINVAL;
 }
 
+/* Write dataset array member with the index number */
+static ssize_t tpdm_simple_dataset_store(struct device *dev,
+					 struct device_attribute *attr,
+					 const char *buf,
+					 size_t size)
+{
+	unsigned long val;
+	ssize_t ret = size;
+
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	struct tpdm_dataset_attribute *tpdm_attr =
+		container_of(attr, struct tpdm_dataset_attribute, attr);
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	switch (tpdm_attr->mem) {
+	case DSB_TRIG_PATT:
+		if (tpdm_attr->idx < TPDM_DSB_MAX_PATT)
+			drvdata->dsb->trig_patt[tpdm_attr->idx] = val;
+		else
+			ret = -EINVAL;
+		break;
+	case DSB_TRIG_PATT_MASK:
+		if (tpdm_attr->idx < TPDM_DSB_MAX_PATT)
+			drvdata->dsb->trig_patt_mask[tpdm_attr->idx] = val;
+		else
+			ret = -EINVAL;
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	spin_unlock(&drvdata->spinlock);
+
+	return ret;
+}
+
 static bool tpdm_has_dsb_dataset(struct tpdm_drvdata *drvdata)
 {
 	return (drvdata->datasets & TPDM_PIDR0_DS_DSB);
@@ -103,7 +151,12 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
 	for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++)
 		writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
 			   drvdata->base + TPDM_DSB_EDCMR(i));
-
+	for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
+		writel_relaxed(drvdata->dsb->trig_patt[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)
@@ -532,6 +585,26 @@ static struct attribute *tpdm_dsb_edge_attrs[] = {
 	NULL,
 };
 
+static struct attribute *tpdm_dsb_trig_patt_attrs[] = {
+	DSB_TRIG_PATT_ATTR(0),
+	DSB_TRIG_PATT_ATTR(1),
+	DSB_TRIG_PATT_ATTR(2),
+	DSB_TRIG_PATT_ATTR(3),
+	DSB_TRIG_PATT_ATTR(4),
+	DSB_TRIG_PATT_ATTR(5),
+	DSB_TRIG_PATT_ATTR(6),
+	DSB_TRIG_PATT_ATTR(7),
+	DSB_TRIG_PATT_MASK_ATTR(0),
+	DSB_TRIG_PATT_MASK_ATTR(1),
+	DSB_TRIG_PATT_MASK_ATTR(2),
+	DSB_TRIG_PATT_MASK_ATTR(3),
+	DSB_TRIG_PATT_MASK_ATTR(4),
+	DSB_TRIG_PATT_MASK_ATTR(5),
+	DSB_TRIG_PATT_MASK_ATTR(6),
+	DSB_TRIG_PATT_MASK_ATTR(7),
+	NULL,
+};
+
 static struct attribute *tpdm_dsb_attrs[] = {
 	&dev_attr_dsb_mode.attr,
 	&dev_attr_dsb_trig_ts.attr,
@@ -550,10 +623,17 @@ static struct attribute_group tpdm_dsb_edge_grp = {
 	.name = "dsb_edge",
 };
 
+static struct attribute_group tpdm_dsb_trig_patt_grp = {
+	.attrs = tpdm_dsb_trig_patt_attrs,
+	.is_visible = tpdm_dsb_is_visible,
+	.name = "dsb_trig_patt",
+};
+
 static const struct attribute_group *tpdm_attr_grps[] = {
 	&tpdm_attr_grp,
 	&tpdm_dsb_attr_grp,
 	&tpdm_dsb_edge_grp,
+	&tpdm_dsb_trig_patt_grp,
 	NULL,
 };
 

drivers/hwtracing/coresight/coresight-tpdm.h

@@ -12,6 +12,8 @@
 /* DSB Subunit Registers */
 #define TPDM_DSB_CR		(0x780)
 #define TPDM_DSB_TIER		(0x784)
+#define TPDM_DSB_XPR(n)		(0x7C8 + (n * 4))
+#define TPDM_DSB_XPMR(n)	(0x7E8 + (n * 4))
 #define TPDM_DSB_EDCR(n)	(0x808 + (n * 4))
 #define TPDM_DSB_EDCMR(n)	(0x848 + (n * 4))
 
@@ -80,6 +82,8 @@
 #define TPDM_DSB_MAX_EDCR	16
 /* MAX number of EDCMR registers */
 #define TPDM_DSB_MAX_EDCMR	8
+/* MAX number of DSB pattern */
+#define TPDM_DSB_MAX_PATT	8
 
 #define tpdm_simple_dataset_ro(name, mem, idx)			\
 	(&((struct tpdm_dataset_attribute[]) {			\
@@ -90,6 +94,16 @@
 	   }								\
 	})[0].attr.attr)
 
+#define tpdm_simple_dataset_rw(name, mem, idx)			\
+	(&((struct tpdm_dataset_attribute[]) {			\
+	   {								\
+		__ATTR(name, 0644, tpdm_simple_dataset_show,		\
+		tpdm_simple_dataset_store),		\
+		mem,							\
+		idx,							\
+	   }								\
+	})[0].attr.attr)
+
 #define DSB_EDGE_CTRL_ATTR(nr)					\
 		tpdm_simple_dataset_ro(edcr##nr,		\
 		DSB_EDGE_CTRL, nr)
@@ -98,12 +112,22 @@
 		tpdm_simple_dataset_ro(edcmr##nr,		\
 		DSB_EDGE_CTRL_MASK, nr)
 
+#define DSB_TRIG_PATT_ATTR(nr)					\
+		tpdm_simple_dataset_rw(xpr##nr,			\
+		DSB_TRIG_PATT, nr)
+
+#define DSB_TRIG_PATT_MASK_ATTR(nr)				\
+		tpdm_simple_dataset_rw(xpmr##nr,		\
+		DSB_TRIG_PATT_MASK, nr)
+
 /**
  * struct dsb_dataset - specifics associated to dsb dataset
  * @mode:             DSB programming mode
  * @edge_ctrl_idx     Index number of the edge control
  * @edge_ctrl:        Save value for edge control
  * @edge_ctrl_mask:   Save value for edge control mask
+ * @trig_patt:        Save value for trigger pattern
+ * @trig_patt_mask:   Save value for trigger pattern mask
  * @trig_ts:          Enable/Disable trigger timestamp.
  * @trig_type:        Enable/Disable trigger type.
  */
@@ -112,6 +136,8 @@ struct dsb_dataset {
 	u32			edge_ctrl_idx;
 	u32			edge_ctrl[TPDM_DSB_MAX_EDCR];
 	u32			edge_ctrl_mask[TPDM_DSB_MAX_EDCMR];
+	u32			trig_patt[TPDM_DSB_MAX_PATT];
+	u32			trig_patt_mask[TPDM_DSB_MAX_PATT];
 	bool			trig_ts;
 	bool			trig_type;
 };
@@ -141,6 +167,8 @@ struct tpdm_drvdata {
 enum dataset_mem {
 	DSB_EDGE_CTRL,
 	DSB_EDGE_CTRL_MASK,
+	DSB_TRIG_PATT,
+	DSB_TRIG_PATT_MASK,
 };
 
 /**