coresight: tpda: add logic to configure TPDA_SYNCR register

The TPDA_SYNC counter tracks the number of bytes transferred from the
aggregator. When this count reaches the value programmed in the
TPDA_SYNCR register, an ASYNC request is triggered, allowing userspace
tools to accurately parse each valid packet.

Signed-off-by: Tao Zhang <tao.zhang@oss.qualcomm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Co-developed-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
[ Fix kernel version in Documentation ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20251223-add_sysfs_nodes_to_configure_tpda-v8-3-4c95db608b62@oss.qualcomm.com

diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda
index acd354d7bdfa7183d43d3269e10905a59e054cca..bd86e6fd961da08342e71e60f79ead74c1241fd3 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda
@@ -41,3 +41,21 @@ Contact:     Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qu
 Description:
                (RW) Set global (all ports) flush request bit. The bit remains set until a
                global flush request sequence completes.
+
+What:          /sys/bus/coresight/devices/<tpda-name>/syncr_mode
+Date:          December 2025
+KernelVersion: 6.20
+Contact:       Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qualcomm.com>, Jie Gan <jie.gan@oss.qualcomm.com>
+Description:
+               (RW) Set mode the of the syncr counter.
+               mode 0 - COUNT[11:0] value represents the approximate number of bytes moved between two ASYNC packet requests
+               mode 1 - the bits COUNT[11:7] are used as a power of 2. for example, we could insert an async packet every 8K
+                        data by writing a value 13 to the COUNT[11:7] field.
+
+What:          /sys/bus/coresight/devices/<tpda-name>/syncr_count
+Date:          December 2025
+KernelVersion: 6.20
+Contact:       Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qualcomm.com>, Jie Gan <jie.gan@oss.qualcomm.com>
+Description:
+               (RW) Set value the of the syncr counter.
+               Range: 0-4095

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index d24a9098f1b1b40923edb5f5a292d52d9c80f6b5..deb5a646a04caf0d54a10be5f6b1b9588b7276be 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -163,6 +163,20 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
         */
        if (drvdata->trig_flag_ts)
                writel_relaxed(0x0, drvdata->base + TPDA_FPID_CR);
+
+       /* Initialize with a value of 0 */
+       val = 0;
+       if (drvdata->syncr_mode)
+               val |= TPDA_SYNCR_MODE_CTRL_MASK;
+
+       if (drvdata->syncr_count > 0 &&
+           drvdata->syncr_count < TPDA_SYNCR_COUNT_MASK)
+               val |= drvdata->syncr_count;
+       else
+               /* Program the count to its MAX value by default */
+               val |= TPDA_SYNCR_COUNT_MASK;
+
+       writel_relaxed(val, drvdata->base + TPDA_SYNCR);
 }
 
 static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
@@ -385,8 +399,84 @@ static ssize_t global_flush_req_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(global_flush_req);
 
+static ssize_t syncr_mode_show(struct device *dev,
+                              struct device_attribute *attr,
+                              char *buf)
+{
+       struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
+       unsigned long val, syncr_val;
+
+       if (!drvdata->csdev->refcnt)
+               return -EINVAL;
+
+       guard(spinlock)(&drvdata->spinlock);
+       syncr_val = readl_relaxed(drvdata->base + TPDA_SYNCR);
+       val = FIELD_GET(TPDA_SYNCR_MODE_CTRL_MASK, syncr_val);
+
+       return sysfs_emit(buf, "%lu\n", val);
+}
+
+static ssize_t syncr_mode_store(struct device *dev,
+                               struct device_attribute *attr,
+                               const char *buf,
+                               size_t size)
+{
+       struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
+       unsigned long val;
+
+       if (kstrtoul(buf, 0, &val))
+               return -EINVAL;
+
+       guard(spinlock)(&drvdata->spinlock);
+       /* set the mode when first enabling the device */
+       drvdata->syncr_mode = !!val;
+
+       return size;
+}
+static DEVICE_ATTR_RW(syncr_mode);
+
+static ssize_t syncr_count_show(struct device *dev,
+                               struct device_attribute *attr,
+                               char *buf)
+{
+       struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
+       unsigned long val;
+
+       if (!drvdata->csdev->refcnt)
+               return -EINVAL;
+
+       guard(spinlock)(&drvdata->spinlock);
+       val = readl_relaxed(drvdata->base + TPDA_SYNCR);
+       val &= TPDA_SYNCR_COUNT_MASK;
+
+       return sysfs_emit(buf, "%lu\n", val);
+}
+
+static ssize_t syncr_count_store(struct device *dev,
+                                struct device_attribute *attr,
+                                const char *buf,
+                                size_t size)
+{
+       struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
+       unsigned long val;
+
+       if (kstrtoul(buf, 0, &val))
+               return -EINVAL;
+
+       if (val > TPDA_SYNCR_COUNT_MASK)
+               return -EINVAL;
+
+       guard(spinlock)(&drvdata->spinlock);
+       drvdata->syncr_count = val;
+
+       return size;
+}
+static DEVICE_ATTR_RW(syncr_count);
+
 static struct attribute *tpda_attrs[] = {
        &dev_attr_global_flush_req.attr,
+       &dev_attr_syncr_mode.attr,
+       &dev_attr_syncr_count.attr,
        tpda_trig_sysfs_rw(freq_ts_enable, FREQTS),
        tpda_trig_sysfs_rw(trig_freq_enable, FRIE),
        tpda_trig_sysfs_rw(trig_flag_ts_enable, FLRIE),

diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
index 1cc9253293ec4199244808fc528735cd86187deb..56d35697303a2995a2a49414bcfe9a52fc5d004c 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tpda.h
+++ b/drivers/hwtracing/coresight/coresight-tpda.h
@@ -9,6 +9,7 @@
 #define TPDA_CR                        (0x000)
 #define TPDA_Pn_CR(n)          (0x004 + (n * 4))
 #define TPDA_FPID_CR           (0x084)
+#define TPDA_SYNCR             (0x08C)
 
 /* Cross trigger global (all ports) flush request bit */
 #define TPDA_CR_FLREQ          BIT(0)
@@ -36,6 +37,11 @@
 /* Aggregator port DSB data set element size bit */
 #define TPDA_Pn_CR_DSBSIZE             BIT(8)
 
+/* TPDA_SYNCR count mask */
+#define TPDA_SYNCR_COUNT_MASK          GENMASK(11, 0)
+/* TPDA_SYNCR mode control bit */
+#define TPDA_SYNCR_MODE_CTRL_MASK      GENMASK(12, 12)
+
 #define TPDA_MAX_INPORTS       32
 
 /**
@@ -52,6 +58,8 @@
  * @trig_freq: Enable/disable cross trigger FREQ packet request interface.
  * @freq_ts:   Enable/disable the timestamp for all FREQ packets.
  * @cmbchan_mode: Configure the CMB/MCMB channel mode.
+ * @syncr_mode:        Setting the mode for counting packets.
+ * @syncr_count: Setting the value of the count.
  */
 struct tpda_drvdata {
        void __iomem            *base;
@@ -66,6 +74,8 @@ struct tpda_drvdata {
        bool                    trig_freq;
        bool                    freq_ts;
        bool                    cmbchan_mode;
+       bool                    syncr_mode;
+       u32                     syncr_count;
 };
 
 /* Enumerate members of global control register(cr) */