| Message ID | 20241105123940.39602-4-quic_jinlmao@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add support to configure TPDM MCMB subunit | expand |
On 05/11/2024 12:39, Mao Jinlong wrote: > From: Tao Zhang <quic_taozha@quicinc.com> > > Add the sysfs file to set/get the enablement of the lane. For MCMB > configurations, the field "E_LN" in CMB_CR register is the > individual lane enables. MCMB lane N is enabled for trace > generation when M_CMB_CR.E=1 and M_CMB_CR.E_LN[N]=1. For lanes > that are not implemented on a given MCMB configuration, the > corresponding bits of this field read as 0 and ignore writes. > > Signed-off-by: Tao Zhang <quic_taozha@quicinc.com> > Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com> > --- > .../testing/sysfs-bus-coresight-devices-tpdm | 7 +++++ > drivers/hwtracing/coresight/coresight-tpdm.c | 29 +++++++++++++++++++ > drivers/hwtracing/coresight/coresight-tpdm.h | 3 ++ > 3 files changed, 39 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > index e833edfec79e..fcc2a8f1f17f 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > @@ -265,3 +265,10 @@ Contact: Tao Zhang (QUIC) <quic_taozha@quicinc.com> > Description: > (RW) Set/Get which lane participates in the output pattern > match cross trigger mechanism for the MCMB subunit TPDM. > + > +What: /sys/bus/coresight/devices/<tpdm-name>/mcmb_lanes_select > +Date: Nov 2024 > +KernelVersion 6.13 6.14 Suzuki > +Contact: Tao Zhang (QUIC) <quic_taozha@quicinc.com> > +Description: > + (RW) Set/Get the enablement of the individual lane. > diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c > index 2e4dc86b03ea..bb0d6505ec9f 100644 > --- a/drivers/hwtracing/coresight/coresight-tpdm.c > +++ b/drivers/hwtracing/coresight/coresight-tpdm.c > @@ -1063,6 +1063,34 @@ static ssize_t mcmb_trig_lane_store(struct device *dev, > } > static DEVICE_ATTR_RW(mcmb_trig_lane); > > +static ssize_t mcmb_lanes_select_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent); > + > + return sysfs_emit(buf, "%u\n", > + (unsigned int)drvdata->cmb->mcmb.lane_select); > +} > + > +static ssize_t mcmb_lanes_select_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 & ~TPDM_MCMB_E_LN_MASK)) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + drvdata->cmb->mcmb.lane_select = val & TPDM_MCMB_E_LN_MASK; > + > + return size; > +} > +static DEVICE_ATTR_RW(mcmb_lanes_select); > + > static struct attribute *tpdm_dsb_edge_attrs[] = { > &dev_attr_ctrl_idx.attr, > &dev_attr_ctrl_val.attr, > @@ -1227,6 +1255,7 @@ static struct attribute *tpdm_cmb_msr_attrs[] = { > > static struct attribute *tpdm_mcmb_attrs[] = { > &dev_attr_mcmb_trig_lane.attr, > + &dev_attr_mcmb_lanes_select.attr, > NULL, > }; > > diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h > index aa9746b2e77f..a80f3d680995 100644 > --- a/drivers/hwtracing/coresight/coresight-tpdm.h > +++ b/drivers/hwtracing/coresight/coresight-tpdm.h > @@ -48,6 +48,9 @@ > /* MAX lanes in the output pattern for MCMB configurations*/ > #define TPDM_MCMB_MAX_LANES 8 > > +/* Filter bit 0~7 from the value for CR_E_LN */ > +#define TPDM_MCMB_E_LN_MASK GENMASK(7, 0) > + > /* DSB Subunit Registers */ > #define TPDM_DSB_CR (0x780) > #define TPDM_DSB_TIER (0x784)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm index e833edfec79e..fcc2a8f1f17f 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm @@ -265,3 +265,10 @@ Contact: Tao Zhang (QUIC) <quic_taozha@quicinc.com> Description: (RW) Set/Get which lane participates in the output pattern match cross trigger mechanism for the MCMB subunit TPDM. + +What: /sys/bus/coresight/devices/<tpdm-name>/mcmb_lanes_select +Date: Nov 2024 +KernelVersion 6.13 +Contact: Tao Zhang (QUIC) <quic_taozha@quicinc.com> +Description: + (RW) Set/Get the enablement of the individual lane. diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c index 2e4dc86b03ea..bb0d6505ec9f 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.c +++ b/drivers/hwtracing/coresight/coresight-tpdm.c @@ -1063,6 +1063,34 @@ static ssize_t mcmb_trig_lane_store(struct device *dev, } static DEVICE_ATTR_RW(mcmb_trig_lane); +static ssize_t mcmb_lanes_select_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent); + + return sysfs_emit(buf, "%u\n", + (unsigned int)drvdata->cmb->mcmb.lane_select); +} + +static ssize_t mcmb_lanes_select_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 & ~TPDM_MCMB_E_LN_MASK)) + return -EINVAL; + + guard(spinlock)(&drvdata->spinlock); + drvdata->cmb->mcmb.lane_select = val & TPDM_MCMB_E_LN_MASK; + + return size; +} +static DEVICE_ATTR_RW(mcmb_lanes_select); + static struct attribute *tpdm_dsb_edge_attrs[] = { &dev_attr_ctrl_idx.attr, &dev_attr_ctrl_val.attr, @@ -1227,6 +1255,7 @@ static struct attribute *tpdm_cmb_msr_attrs[] = { static struct attribute *tpdm_mcmb_attrs[] = { &dev_attr_mcmb_trig_lane.attr, + &dev_attr_mcmb_lanes_select.attr, NULL, }; diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h index aa9746b2e77f..a80f3d680995 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.h +++ b/drivers/hwtracing/coresight/coresight-tpdm.h @@ -48,6 +48,9 @@ /* MAX lanes in the output pattern for MCMB configurations*/ #define TPDM_MCMB_MAX_LANES 8 +/* Filter bit 0~7 from the value for CR_E_LN */ +#define TPDM_MCMB_E_LN_MASK GENMASK(7, 0) + /* DSB Subunit Registers */ #define TPDM_DSB_CR (0x780) #define TPDM_DSB_TIER (0x784)