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  3. [PATCH v2 0/9] Add support to configure TPDM DSB subunit
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[PATCH v2 6/9] coresight-tpdm: Add node to set dsb programming mode

Tao Zhang posted 9 patches 2 years, 7 months ago
There is a newer version of this series
[PATCH v2 6/9] coresight-tpdm: Add node to set dsb programming mode
Posted by Tao Zhang 2 years, 7 months ago 
Add node to set and show programming mode for TPDM DSB subunit.
Once the DSB programming mode is set, it will be written to the
register DSB_CR. Bit[10:9] of the DSB_CR register is used to set
the DSB test mode.

Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Tao Zhang <taozha@qti.qualcomm.com>
---
 drivers/hwtracing/coresight/coresight-tpdm.c | 45 +++++++++++++++++++++++++++-
 drivers/hwtracing/coresight/coresight-tpdm.h | 12 ++++++++
 2 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 1dbb6c4..9126a37 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/amba/bus.h>
+#include <linux/bitfield.h>
 #include <linux/bitmap.h>
 #include <linux/coresight.h>
 #include <linux/coresight-pmu.h>
@@ -38,7 +39,7 @@ static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
 
 static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
 {
-	u32 val;
+	u32 val, mode;
 
 	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
 	/* Set trigger timestamp */
@@ -58,6 +59,19 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
 
 	/* Set the enable bit of DSB control register to 1 */
 	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
+	/* Set the cycle accurate mode */
+	mode = TPDM_DSB_MODE_CYCACC(drvdata->dsb->mode);
+	val &= ~TPDM_DSB_TEST_MODE;
+	val |= FIELD_PREP(TPDM_DSB_TEST_MODE, mode);
+	/* Set the byte lane for high-performance mode */
+	mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode);
+	val &= ~TPDM_DSB_HPSEL;
+	val |= FIELD_PREP(TPDM_DSB_HPSEL, mode);
+	/* Set the performance mode */
+	if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF)
+		val |= TPDM_DSB_MODE;
+	else
+		val &= ~TPDM_DSB_MODE;
 	val |= TPDM_DSB_CR_ENA;
 	writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
 }
@@ -257,6 +271,34 @@ static struct attribute_group tpdm_attr_grp = {
 	.attrs = tpdm_attrs,
 };
 
+static ssize_t dsb_mode_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	return sysfs_emit(buf, "%lx\n",
+			 (unsigned long)drvdata->dsb->mode);
+}
+
+static ssize_t dsb_mode_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)) || val < 0)
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	drvdata->dsb->mode = val & TPDM_MODE_ALL;
+	spin_unlock(&drvdata->spinlock);
+	return size;
+}
+static DEVICE_ATTR_RW(dsb_mode);
+
 static ssize_t dsb_trig_type_show(struct device *dev,
 				     struct device_attribute *attr,
 				     char *buf)
@@ -327,6 +369,7 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(dsb_trig_ts);
 static struct attribute *tpdm_dsb_attrs[] = {
+	&dev_attr_dsb_mode.attr,
 	&dev_attr_dsb_trig_ts.attr,
 	&dev_attr_dsb_trig_type.attr,
 	NULL,
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
index 3ad1be5..b3ecb9f 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -19,6 +19,16 @@
 #define TPDM_DSB_XTRIG_TSENAB		BIT(1)
 /* Enable bit for DSB subunit trigger type */
 #define TPDM_DSB_TRIG_TYPE		BIT(12)
+/* Enable bit for DSB subunit perfmance mode */
+#define TPDM_DSB_MODE		BIT(1)
+
+/* DSB programming modes */
+#define TPDM_DSB_MODE_CYCACC(val)	(val & GENMASK(2, 0))
+#define TPDM_DSB_MODE_PERF		BIT(3)
+#define TPDM_DSB_MODE_HPBYTESEL(val)	(val & GENMASK(8, 4))
+#define TPDM_MODE_ALL			(0xFFFFFFF)
+#define TPDM_DSB_TEST_MODE		GENMASK(11, 9)
+#define TPDM_DSB_HPSEL		GENMASK(6, 2)
 
 /* TPDM integration test registers */
 #define TPDM_ITATBCNTRL		(0xEF0)
@@ -48,10 +58,12 @@
 
 /**
  * struct dsb_dataset - specifics associated to dsb dataset
+ * @mode:             DSB programming mode
  * @trig_ts:          Enable/Disable trigger timestamp.
  * @trig_type:        Enable/Disable trigger type.
  */
 struct dsb_dataset {
+	u32				mode;
 	bool			trig_ts;
 	bool			trig_type;
 };
-- 
2.7.4
Re: [PATCH v2 6/9] coresight-tpdm: Add node to set dsb programming mode
Posted by Suzuki K Poulose 2 years, 6 months ago 
On 19/01/2023 07:41, Tao Zhang wrote:
> Add node to set and show programming mode for TPDM DSB subunit.
> Once the DSB programming mode is set, it will be written to the
> register DSB_CR. Bit[10:9] of the DSB_CR register is used to set
> the DSB test mode.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> Signed-off-by: Tao Zhang <taozha@qti.qualcomm.com>
> ---
>   drivers/hwtracing/coresight/coresight-tpdm.c | 45 +++++++++++++++++++++++++++-
>   drivers/hwtracing/coresight/coresight-tpdm.h | 12 ++++++++
>   2 files changed, 56 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 1dbb6c4..9126a37 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -4,6 +4,7 @@
>    */
>   
>   #include <linux/amba/bus.h>
> +#include <linux/bitfield.h>
>   #include <linux/bitmap.h>
>   #include <linux/coresight.h>
>   #include <linux/coresight-pmu.h>
> @@ -38,7 +39,7 @@ static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
>   
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
> -	u32 val;
> +	u32 val, mode;
>   
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>   	/* Set trigger timestamp */
> @@ -58,6 +59,19 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   
>   	/* Set the enable bit of DSB control register to 1 */
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
> +	/* Set the cycle accurate mode */
> +	mode = TPDM_DSB_MODE_CYCACC(drvdata->dsb->mode);
> +	val &= ~TPDM_DSB_TEST_MODE;
> +	val |= FIELD_PREP(TPDM_DSB_TEST_MODE, mode);
> +	/* Set the byte lane for high-performance mode */
> +	mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode);
> +	val &= ~TPDM_DSB_HPSEL;
> +	val |= FIELD_PREP(TPDM_DSB_HPSEL, mode);
> +	/* Set the performance mode */
> +	if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF)
> +		val |= TPDM_DSB_MODE;
> +	else
> +		val &= ~TPDM_DSB_MODE;

This looks a bit tricky to me. Please could you add documentation of
the values supported under Documentation/ABI/testing/sysfs-....-

Couldn't we provide separate handles for these "mode bits" ?

cycacc
perf
hpsel

Suzuki


>   	val |= TPDM_DSB_CR_ENA;
>   	writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
>   }
> @@ -257,6 +271,34 @@ static struct attribute_group tpdm_attr_grp = {
>   	.attrs = tpdm_attrs,
>   };
>   
> +static ssize_t dsb_mode_show(struct device *dev,
> +				  struct device_attribute *attr,
> +				  char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> +	return sysfs_emit(buf, "%lx\n",
> +			 (unsigned long)drvdata->dsb->mode);
> +}
> +
> +static ssize_t dsb_mode_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)) || val < 0)
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->mode = val & TPDM_MODE_ALL;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_mode);
> +
>   static ssize_t dsb_trig_type_show(struct device *dev,
>   				     struct device_attribute *attr,
>   				     char *buf)
> @@ -327,6 +369,7 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
>   }
>   static DEVICE_ATTR_RW(dsb_trig_ts);
>   static struct attribute *tpdm_dsb_attrs[] = {
> +	&dev_attr_dsb_mode.attr,
>   	&dev_attr_dsb_trig_ts.attr,
>   	&dev_attr_dsb_trig_type.attr,
>   	NULL,
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index 3ad1be5..b3ecb9f 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -19,6 +19,16 @@
>   #define TPDM_DSB_XTRIG_TSENAB		BIT(1)
>   /* Enable bit for DSB subunit trigger type */
>   #define TPDM_DSB_TRIG_TYPE		BIT(12)
> +/* Enable bit for DSB subunit perfmance mode */
> +#define TPDM_DSB_MODE		BIT(1)
> +
> +/* DSB programming modes */
> +#define TPDM_DSB_MODE_CYCACC(val)	(val & GENMASK(2, 0))
> +#define TPDM_DSB_MODE_PERF		BIT(3)
> +#define TPDM_DSB_MODE_HPBYTESEL(val)	(val & GENMASK(8, 4))
> +#define TPDM_MODE_ALL			(0xFFFFFFF)
> +#define TPDM_DSB_TEST_MODE		GENMASK(11, 9)
> +#define TPDM_DSB_HPSEL		GENMASK(6, 2)
>   
>   /* TPDM integration test registers */
>   #define TPDM_ITATBCNTRL		(0xEF0)
> @@ -48,10 +58,12 @@
>   
>   /**
>    * struct dsb_dataset - specifics associated to dsb dataset
> + * @mode:             DSB programming mode
>    * @trig_ts:          Enable/Disable trigger timestamp.
>    * @trig_type:        Enable/Disable trigger type.
>    */
>   struct dsb_dataset {
> +	u32				mode;
>   	bool			trig_ts;
>   	bool			trig_type;
>   };
Re: [PATCH v2 6/9] coresight-tpdm: Add node to set dsb programming mode
Posted by Tao Zhang 2 years, 6 months ago 
Hi Suzuki,

在 2/28/2023 7:35 PM, Suzuki K Poulose 写道:
> On 19/01/2023 07:41, Tao Zhang wrote:
>> Add node to set and show programming mode for TPDM DSB subunit.
>> Once the DSB programming mode is set, it will be written to the
>> register DSB_CR. Bit[10:9] of the DSB_CR register is used to set
>> the DSB test mode.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> Signed-off-by: Tao Zhang <taozha@qti.qualcomm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpdm.c | 45 
>> +++++++++++++++++++++++++++-
>>   drivers/hwtracing/coresight/coresight-tpdm.h | 12 ++++++++
>>   2 files changed, 56 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index 1dbb6c4..9126a37 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -4,6 +4,7 @@
>>    */
>>     #include <linux/amba/bus.h>
>> +#include <linux/bitfield.h>
>>   #include <linux/bitmap.h>
>>   #include <linux/coresight.h>
>>   #include <linux/coresight-pmu.h>
>> @@ -38,7 +39,7 @@ static umode_t tpdm_dsb_is_visible(struct kobject 
>> *kobj,
>>     static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>   {
>> -    u32 val;
>> +    u32 val, mode;
>>         val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>>       /* Set trigger timestamp */
>> @@ -58,6 +59,19 @@ static void tpdm_enable_dsb(struct tpdm_drvdata 
>> *drvdata)
>>         /* Set the enable bit of DSB control register to 1 */
>>       val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
>> +    /* Set the cycle accurate mode */
>> +    mode = TPDM_DSB_MODE_CYCACC(drvdata->dsb->mode);
>> +    val &= ~TPDM_DSB_TEST_MODE;
>> +    val |= FIELD_PREP(TPDM_DSB_TEST_MODE, mode);
>> +    /* Set the byte lane for high-performance mode */
>> +    mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode);
>> +    val &= ~TPDM_DSB_HPSEL;
>> +    val |= FIELD_PREP(TPDM_DSB_HPSEL, mode);
>> +    /* Set the performance mode */
>> +    if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF)
>> +        val |= TPDM_DSB_MODE;
>> +    else
>> +        val &= ~TPDM_DSB_MODE;
>
> This looks a bit tricky to me. Please could you add documentation of
> the values supported under Documentation/ABI/testing/sysfs-....-
>
> Couldn't we provide separate handles for these "mode bits" ?
>
> cycacc
> perf
> hpsel

Sure, I will update this according to your advice in the next version of 
the patch.

Tao

>
> Suzuki
>
>
>>       val |= TPDM_DSB_CR_ENA;
>>       writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
>>   }
>> @@ -257,6 +271,34 @@ static struct attribute_group tpdm_attr_grp = {
>>       .attrs = tpdm_attrs,
>>   };
>>   +static ssize_t dsb_mode_show(struct device *dev,
>> +                  struct device_attribute *attr,
>> +                  char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> +    return sysfs_emit(buf, "%lx\n",
>> +             (unsigned long)drvdata->dsb->mode);
>> +}
>> +
>> +static ssize_t dsb_mode_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)) || val < 0)
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    drvdata->dsb->mode = val & TPDM_MODE_ALL;
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_mode);
>> +
>>   static ssize_t dsb_trig_type_show(struct device *dev,
>>                        struct device_attribute *attr,
>>                        char *buf)
>> @@ -327,6 +369,7 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
>>   }
>>   static DEVICE_ATTR_RW(dsb_trig_ts);
>>   static struct attribute *tpdm_dsb_attrs[] = {
>> +    &dev_attr_dsb_mode.attr,
>>       &dev_attr_dsb_trig_ts.attr,
>>       &dev_attr_dsb_trig_type.attr,
>>       NULL,
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h 
>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>> index 3ad1be5..b3ecb9f 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>> @@ -19,6 +19,16 @@
>>   #define TPDM_DSB_XTRIG_TSENAB        BIT(1)
>>   /* Enable bit for DSB subunit trigger type */
>>   #define TPDM_DSB_TRIG_TYPE        BIT(12)
>> +/* Enable bit for DSB subunit perfmance mode */
>> +#define TPDM_DSB_MODE        BIT(1)
>> +
>> +/* DSB programming modes */
>> +#define TPDM_DSB_MODE_CYCACC(val)    (val & GENMASK(2, 0))
>> +#define TPDM_DSB_MODE_PERF        BIT(3)
>> +#define TPDM_DSB_MODE_HPBYTESEL(val)    (val & GENMASK(8, 4))
>> +#define TPDM_MODE_ALL            (0xFFFFFFF)
>> +#define TPDM_DSB_TEST_MODE        GENMASK(11, 9)
>> +#define TPDM_DSB_HPSEL        GENMASK(6, 2)
>>     /* TPDM integration test registers */
>>   #define TPDM_ITATBCNTRL        (0xEF0)
>> @@ -48,10 +58,12 @@
>>     /**
>>    * struct dsb_dataset - specifics associated to dsb dataset
>> + * @mode:             DSB programming mode
>>    * @trig_ts:          Enable/Disable trigger timestamp.
>>    * @trig_type:        Enable/Disable trigger type.
>>    */
>>   struct dsb_dataset {
>> +    u32                mode;
>>       bool            trig_ts;
>>       bool            trig_type;
>>   };
>

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