Re: [PATCH v7 10/13] coresight-tpdm: Add nodes to configure pattern match output
From: Suzuki K Poulose
Date: Mon Aug 07 2023 - 07:24:21 EST
On 25/07/2023 08:15, Tao Zhang wrote:
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@xxxxxxxxxxx>
---
.../ABI/testing/sysfs-bus-coresight-devices-tpdm | 34 +++++-
drivers/hwtracing/coresight/coresight-tpdm.c | 118 +++++++++++++++++++++
drivers/hwtracing/coresight/coresight-tpdm.h | 10 ++
3 files changed, 161 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
index a4550c5..66f9582 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
@@ -98,4 +98,36 @@ Description:
should be written first to configure the index number of the edge
detection which needs to be masked.
- Accepts only one of the 2 values - 0 or 1.
\ No newline at end of file
+ Accepts only one of the 2 values - 0 or 1.
+
+What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_idx
+Date: March 2023
+KernelVersion 6.5
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
+Description:
+ Read/Write the index number of the trigger pattern value of DSB
+ tpdm. Since there are at most 8 XPR and XPMR registers for the
+ trigger parttern, this value ranges from 0 to 7.
+
+What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_val
+Date: March 2023
+KernelVersion 6.5
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
+Description:
+ Read a set of the trigger pattern values of the DSB TPDM.
+ Write a data to configure the trigger pattern corresponding to
+ the index number. Before writing data to this sysfs file,
+ "dsb_trig_patt_idx" should be written first to configure the
+ index number of the trigger pattern which needs to be configured.
+
+What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_mask
+Date: March 2023
+KernelVersion 6.5
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
+Description:
+ Read a set of the trigger pattern mask of the DSB TPDM.
+ Write a data to configure the trigger pattern mask corresponding
+ to the index number. Before writing data to this sysfs file,
+ "dsb_trig_patt_idx" should be written first to configure the
+ index number of the trigger pattern mask which needs to be
+ configured.
\ No newline at end of file
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 98fd6ab..1c32d27 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -80,6 +80,13 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
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)
@@ -455,6 +462,114 @@ static ssize_t dsb_edge_ctrl_mask_store(struct device *dev,
}
static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
+static ssize_t dsb_trig_patt_idx_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->dsb->trig_patt_idx);
+}
+
+static ssize_t dsb_trig_patt_idx_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 index;
+
+ if (kstrtoul(buf, 0, &index))
+ return -EINVAL;
+ if (index >= TPDM_DSB_MAX_PATT)
+ return -EPERM;
+
+ spin_lock(&drvdata->spinlock);
+ drvdata->dsb->trig_patt_idx = index;
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(dsb_trig_patt_idx);
+
+static ssize_t dsb_trig_patt_val_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ ssize_t size = 0;
+ unsigned long bytes;
+ int i = 0;
+
+ spin_lock(&drvdata->spinlock);
+ for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
+ bytes = sysfs_emit_at(buf, size,
+ "Value: 0x%x\n", drvdata->dsb->trig_patt[i]);
+ if (bytes <= 0)
+ break;
+ size += bytes;
+ }
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+
+static ssize_t dsb_trig_patt_val_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))
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ drvdata->dsb->trig_patt[drvdata->dsb->trig_patt_idx] = val;
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(dsb_trig_patt_val);
+
+static ssize_t dsb_trig_patt_mask_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ ssize_t size = 0;
+ unsigned long bytes;
+ int i = 0;
+
+ spin_lock(&drvdata->spinlock);
+ for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
+ bytes = sysfs_emit_at(buf, size,
+ "Value: 0x%x\n", drvdata->dsb->trig_patt_mask[i]);
As mentioned above, please stick to single value. In this case, we could
simply expose :
dsb_trig_patt_mask0..7 as RW and directly let the user set/get the
values and get rid of the idx.
You may be able to use an device_ext_attribute to store the index and
use a single function to support all registers.
Suzuki