Re: [PATCH v4 06/11] coresight-tpdm: Add node to set dsb programming mode

[Suzuki K Poulose <suzuki.poulose@arm.com>]

On 27/04/2023 10:00, 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.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 15 ++++++
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 62 ++++++++++++++++++++++
>   drivers/hwtracing/coresight/coresight-tpdm.h       | 16 ++++++
>   3 files changed, 93 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 77e67f2..348e167 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -45,3 +45,18 @@ Description:
>   		Accepts only one of the 2 values -  0 or 1.
>   		0 : Set the DSB trigger type to false
>   		1 : Set the DSB trigger type to true
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_mode
> +Date:		March 2023
> +KernelVersion	6.3
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		(Write) Set the mode of DSB tpdm. Read the mode of DSB
> +		tpdm.
> +
> +		Accepts the value needs to be greater than 0. What data
> +		bits do is listed below.
> +		Bit[0:1] : Test mode control bit for choosing the inputs.
> +		Bit[3] : Set to 0 for low performance mode.
> +				 Set to 1 for high performance mode.
> +		Bit[4:8] : Select byte lane for high performance mode.
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 14f4352..1bacaa5 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>
> @@ -43,6 +44,32 @@ static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>   	}
>   }
>   
> +static void set_dsb_test_mode(struct tpdm_drvdata *drvdata, u32 *val)
> +{
> +	u32 mode;
> +
> +	mode = TPDM_DSB_MODE_TEST(drvdata->dsb->mode);
> +	*val &= ~TPDM_DSB_TEST_MODE;
> +	*val |= FIELD_PREP(TPDM_DSB_TEST_MODE, mode);
> +}
> +
> +static void set_dsb_hpsel_mode(struct tpdm_drvdata *drvdata, u32 *val)
> +{
> +	u32 mode;
> +
> +	mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode);
> +	*val &= ~TPDM_DSB_HPSEL;
> +	*val |= FIELD_PREP(TPDM_DSB_HPSEL, mode);
> +}
> +
> +static void set_dsb_perf_mode(struct tpdm_drvdata *drvdata, u32 *val)
> +{
> +	if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF)
> +		*val |= TPDM_DSB_CR_MODE;
> +	else
> +		*val &= ~TPDM_DSB_CR_MODE;
> +}
> +
>   static void set_trigger_type(struct tpdm_drvdata *drvdata, u32 *val)
>   {
>   	if (drvdata->dsb->trig_type)
> @@ -64,6 +91,12 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   	writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>   
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
> +	/* Set the test accurate mode */
> +	set_dsb_test_mode(drvdata, &val);
> +	/* Set the byte lane for high-performance mode */
> +	set_dsb_hpsel_mode(drvdata, &val);
> +	/* Set the performance mode */
> +	set_dsb_perf_mode(drvdata, &val);
>   	/* Set trigger type */
>   	set_trigger_type(drvdata, &val);
>   	/* Set the enable bit of DSB control register to 1 */
> @@ -252,6 +285,34 @@ 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)
>   {
> @@ -323,6 +384,7 @@ 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 68f33bd..79df07e 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -15,11 +15,25 @@
>   
>   /* Enable bit for DSB subunit */
>   #define TPDM_DSB_CR_ENA		BIT(0)
> +/* Enable bit for DSB subunit perfmance mode */
> +#define TPDM_DSB_CR_MODE		BIT(1)
>   /* 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)
>   
> +/* DSB programming modes */
> +/* Test mode control bit*/
> +#define TPDM_DSB_MODE_TEST(val)	(val & GENMASK(1, 0))
> +/* Perforceman mode */

minor nit: typo ^^

> +#define TPDM_DSB_MODE_PERF		BIT(3)
> +/* High performance mode */
> +#define TPDM_DSB_MODE_HPBYTESEL(val)	(val & GENMASK(8, 4))
> +#define TPDM_MODE_ALL			(0xFFFFFFF)

GENMASK(27, 0) ?

Also, why do we cover bits 27-0 ?

Suzuki