Re: [PATCH v7 05/13] coresight-tpdm: Initialize DSB subunit configuration
From: Suzuki K Poulose
Date: Mon Aug 07 2023 - 05:29:02 EST
On 25/07/2023 08:15, Tao Zhang wrote:
DSB is used for monitoring “events”. Events are something that
occurs at some point in time. It could be a state decode, the
act of writing/reading a particular address, a FIFO being empty,
etc. This decoding of the event desired is done outside TPDM.
DSB subunit need to be configured in enablement and disablement.
A struct that specifics associated to dsb dataset is needed. It
saves the configuration and parameters of the dsb datasets. This
change is to add this struct and initialize the configuration of
DSB subunit.
Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
---
drivers/hwtracing/coresight/coresight-tpdm.c | 55 ++++++++++++++++++++++++++--
drivers/hwtracing/coresight/coresight-tpdm.h | 18 +++++++++
2 files changed, 69 insertions(+), 4 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index abaff0b..52aa48a6 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -20,17 +20,46 @@
DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
+static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
+{
+ if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
Do we need a helper for this, we seem to be doing this more than once ?
tpdm_has_dsb_dataset(drvdata) ?
+ memset(drvdata->dsb, 0, sizeof(struct dsb_dataset));
+
+ drvdata->dsb->trig_ts = true;
+ drvdata->dsb->trig_type = false;
+ }
+}
+
static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
{
u32 val;
- /* Set the enable bit of DSB control register to 1 */
+ val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
+ /* Set trigger timestamp */
+ if (drvdata->dsb->trig_ts)
+ val |= TPDM_DSB_TIER_XTRIG_TSENAB;
+ else
+ val &= ~TPDM_DSB_TIER_XTRIG_TSENAB;
+ writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
+
val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
+ /* Set trigger type */
+ if (drvdata->dsb->trig_type)
+ val |= TPDM_DSB_CR_TRIG_TYPE;
+ else
+ val &= ~TPDM_DSB_CR_TRIG_TYPE;
+ /* Set the enable bit of DSB control register to 1 */
val |= TPDM_DSB_CR_ENA;
writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
}
-/* TPDM enable operations */
+/* TPDM enable operations
minor nit:
/*
* TPDM enable..
+ * The TPDM or Monitor serves as data collection component for various
+ * dataset types. It covers Basic Counts(BC), Tenure Counts(TC),
+ * Continuous Multi-Bit(CMB), Multi-lane CMB(MCMB) and Discrete Single
+ * Bit(DSB). This function will initialize the configuration according
+ * to the dataset type supported by the TPDM.
+ */
static void __tpdm_enable(struct tpdm_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
@@ -110,13 +139,24 @@ static const struct coresight_ops tpdm_cs_ops = {
.source_ops = &tpdm_source_ops,
};
-static void tpdm_init_default_data(struct tpdm_drvdata *drvdata)
+static int tpdm_datasets_setup(struct tpdm_drvdata *drvdata)
{
u32 pidr;
/* Get the datasets present on the TPDM. */
pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0);
drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0);
+
+ if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
+ if (!drvdata->dsb) {
This could be :
if (tpdm_has_dsb_dataset(drvdata) && !drvdata->dsb) {
+ drvdata->dsb = devm_kzalloc(drvdata->dev,
+ sizeof(*drvdata->dsb), GFP_KERNEL);
+ if (!drvdata->dsb)
+ return -ENOMEM;
}
+ }
+ }
Could we move the reset datasets here ?
tpdm_reset_datasets(drvdata);
+
+ return 0;
}
/*
@@ -179,6 +219,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
struct coresight_platform_data *pdata;
struct tpdm_drvdata *drvdata;
struct coresight_desc desc = { 0 };
+ int ret;
pdata = coresight_get_platform_data(dev);
if (IS_ERR(pdata))
@@ -198,6 +239,12 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
drvdata->base = base;
+ ret = tpdm_datasets_setup(drvdata);
+ if (ret)
+ return ret;
+
+ tpdm_reset_datasets(drvdata);
^^ We could move this to datasets_setup(), see above.
+
/* Set up coresight component description */
desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
if (!desc.name)
@@ -214,7 +261,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
return PTR_ERR(drvdata->csdev);
spin_lock_init(&drvdata->spinlock);
- tpdm_init_default_data(drvdata);
+
/* Decrease pm refcount when probe is done.*/
pm_runtime_put(&adev->dev);
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
index 5438540..92c34cd 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -11,8 +11,14 @@
/* DSB Subunit Registers */
#define TPDM_DSB_CR (0x780)
+#define TPDM_DSB_TIER (0x784)
+
/* Enable bit for DSB subunit */
#define TPDM_DSB_CR_ENA BIT(0)
+/* Enable bit for DSB subunit trigger type */
+#define TPDM_DSB_CR_TRIG_TYPE BIT(12)
+/* Enable bit for DSB subunit trigger timestamp */
+#define TPDM_DSB_TIER_XTRIG_TSENAB BIT(1)
/* TPDM integration test registers */
#define TPDM_ITATBCNTRL (0xEF0)
@@ -41,6 +47,16 @@
#define TPDM_PIDR0_DS_DSB BIT(1)
/**
+ * struct dsb_dataset - specifics associated to dsb dataset
+ * @trig_ts: Enable/Disable trigger timestamp.
+ * @trig_type: Enable/Disable trigger type.
+ */
+struct dsb_dataset {
+ bool trig_ts;
+ bool trig_type;
+};
+
+/**
* struct tpdm_drvdata - specifics associated to an TPDM component
* @base: memory mapped base address for this component.
* @dev: The device entity associated to this component.
@@ -48,6 +64,7 @@
* @spinlock: lock for the drvdata value.
* @enable: enable status of the component.
* @datasets: The datasets types present of the TPDM.
+ * @dsb Specifics associated to an TPDM component.
TPDM DSB related settings ?
Suzuki
*/
struct tpdm_drvdata {
@@ -57,6 +74,7 @@ struct tpdm_drvdata {
spinlock_t spinlock;
bool enable;
unsigned long datasets;
+ struct dsb_dataset *dsb;
};
#endif /* _CORESIGHT_CORESIGHT_TPDM_H */