Re: [PATCH v8 04/13] coresight-tpda: Add DSB dataset support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 22/08/2023 06:26, Tao Zhang wrote:
Read the DSB element size from the device tree. Set the register
bit that controls the DSB element size of the corresponding port.

Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
---
  drivers/hwtracing/coresight/coresight-tpda.c | 126 ++++++++++++++++++++++++---
  drivers/hwtracing/coresight/coresight-tpda.h |   2 +
  2 files changed, 118 insertions(+), 10 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index 8d2b9d2..0f21cd1 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -21,6 +21,80 @@
DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda"); +static bool coresight_device_is_tpdm(struct coresight_device *csdev)
+{
+	return (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
+			(csdev->subtype.source_subtype ==

minor nit: Please align

	return (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
	       (csdev->subtype.source_subtype ==
+			CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);


+}
+
+/*
+ * Read the DSB element size from the TPDM device
+ * Returns
+ *    The dsb element size read from the devicetree if available.
+ *    0 - Otherwise, with a warning once.
+ */
+static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
+{
+	int rc = 0;
+	u8 size = 0;
+
+	rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
+			"qcom,dsb-element-size", &size);
+	if (rc)
+		dev_warn_once(&csdev->dev,
+			"Failed to read TPDM DSB Element size: %d\n", rc);
+
+	return size;
+}
+
+/*
+ * Search and read element data size from the TPDM node in
+ * the devicetree. Each input port of TPDA is connected to
+ * a TPDM. Different TPDM supports different types of dataset,
+ * and some may support more than one type of dataset.
+ * Parameter "inport" is used to pass in the input port number
+ * of TPDA, and it is set to -1 in the recursize call.
+ */
+static int tpda_get_element_size(struct coresight_device *csdev,
+								 int inport)

nit: Again, please align.

static int tpda_get_element_size(struct coresight_device *csdev,
				 int inport)
{

	
+{
+	int dsb_size = -ENOENT;
+	int i, size;
+	struct coresight_device *in;
+
+	for (i = 0; i < csdev->pdata->nr_inconns; i++) {
+		in = csdev->pdata->in_conns[i]->src_dev;
+		if (!in)
+			continue;
+
+		/* Ignore the paths that do not match port */
+		if (inport > 0 &&
+			(csdev->pdata->in_conns[i]->dest_port != inport))

Align please :

		if (inport > 0 &&
		    (csdev->pdata->in_conns[i]->dest_port != inport))

+			continue;
+
+		if (coresight_device_is_tpdm(in)) {
+			size = tpdm_read_dsb_element_size(in);
+		} else {
+			/* Recurse down the path */
+			size = tpda_get_element_size(in, -1);
+		}
+
+		if (size < 0)
+			return size;
+
+		if (dsb_size < 0) {
+			/* Found a size, save it. */
+			dsb_size = size;
+		} else {
+			/* Found duplicate TPDMs */
+			return -EEXIST;
+		}
+	}
+
+	return dsb_size;
+}
+
  /* Settings pre enabling port control register */
  static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
  {
@@ -32,26 +106,55 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
  	writel_relaxed(val, drvdata->base + TPDA_CR);
  }
-static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
+static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
  {
  	u32 val;
+	int size;
val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
+	/*
+	 * Configure aggregator port n DSB data set element size
+	 * Set the bit to 0 if the size is 32
+	 * Set the bit to 1 if the size is 64
+	 */
+	size = tpda_get_element_size(drvdata->csdev, port);
+	switch (size) {
+	case 32:
+		val &= ~TPDA_Pn_CR_DSBSIZE;
+		break;
+	case 64:
+		val |= TPDA_Pn_CR_DSBSIZE;
+		break;
+	case 0:
+		return -EEXIST;
+	case -EEXIST:
+		dev_warn_once(&drvdata->csdev->dev,
+			"Detected multiple TPDMs on port %d", -EEXIST);
+		return -EEXIST;
+	default:
+		return -EINVAL;
+	}
+
  	/* Enable the port */
  	val |= TPDA_Pn_CR_ENA;
  	writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
+
+	return 0;
  }
-static void __tpda_enable(struct tpda_drvdata *drvdata, int port)
+static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
  {
+	int ret;
+
  	CS_UNLOCK(drvdata->base);
if (!drvdata->csdev->enable)
  		tpda_enable_pre_port(drvdata);
- tpda_enable_port(drvdata, port);
-
+	ret = tpda_enable_port(drvdata, port);
  	CS_LOCK(drvdata->base);
+
+	return ret;
  }
static int tpda_enable(struct coresight_device *csdev,
@@ -59,16 +162,19 @@ static int tpda_enable(struct coresight_device *csdev,
  		       struct coresight_connection *out)
  {
  	struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+	int ret;

As reported by the build robot, please initialise this to 0.

spin_lock(&drvdata->spinlock);
-	if (atomic_read(&in->dest_refcnt) == 0)
-		__tpda_enable(drvdata, in->dest_port);
+	if (atomic_read(&in->dest_refcnt) == 0) {
+		ret = __tpda_enable(drvdata, in->dest_port);
+		if (!ret) {
+			atomic_inc(&in->dest_refcnt);
+			dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
+		}
+	}
- atomic_inc(&in->dest_refcnt);
  	spin_unlock(&drvdata->spinlock);
-
-	dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
-	return 0;
+	return ret;
  }
static void __tpda_disable(struct tpda_drvdata *drvdata, int port)
diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
index 0399678..b3b38fd 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.h
+++ b/drivers/hwtracing/coresight/coresight-tpda.h
@@ -10,6 +10,8 @@
  #define TPDA_Pn_CR(n)		(0x004 + (n * 4))
  /* Aggregator port enable bit */
  #define TPDA_Pn_CR_ENA		BIT(0)
+/* Aggregator port DSB data set element size bit */
+#define TPDA_Pn_CR_DSBSIZE		BIT(8)
#define TPDA_MAX_INPORTS 32

Rest looks fine to me.

Suzuki




[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux