CoreSight

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2607 discussions

Re: [PATCH v2] coresight-etm4x: Conditionally access register TRCEXTINSELR

by Suzuki K Poulose

On Tue, 12 Aug 2025 01:24:45 -0700, Yuanfang Zhang wrote: > The TRCEXTINSELR is only implemented if TRCIDR5.NUMEXTINSEL > 0. > To avoid invalid accesses, introduce a check on numextinsel > (derived from TRCIDR5[11:9]) before reading or writing to this register. > > The patch looks good to me. May be we could expose this via sysfs, like we do for the other fields. That can be a separate patch without the Fixes tag. I have applied this patch to -next, thanks! [1/1] coresight-etm4x: Conditionally access register TRCEXTINSELR https://git.kernel.org/coresight/c/fa71e9cb4cfa Best regards, -- Suzuki K Poulose <suzuki.poulose(a)arm.com>

4 months, 2 weeks

[PATCH v3 0/3] coresight-tnoc: Add support for Interconnect TNOC

by Yuanfang Zhang

This patch series adds support for the Qualcomm CoreSight Interconnect TNOC (Trace Network On Chip) block, which acts as a CoreSight graph link forwarding trace data from subsystems to the Aggregator TNOC. Unlike the Aggregator TNOC, this block does not support aggregation or ATID assignment. Signed-off-by: Yuanfang Zhang <yuanfang.zhang(a)oss.qualcomm.com> --- Changes in v3: - Add detail for changes in V2. - Remove '#address-cells' and '#size-cells' properties from in-ports field. - Fix comment indentation for packet description. - Link to v2: https://lore.kernel.org/r/20250819-itnoc-v2-0-2d0e6be44e2f@oss.qualcomm.com Changes in v2: - Removed the trailing '|' after the description in qcom,coresight-itnoc.yaml. - Dropped the 'select' section from the YAML file. - Updated node name to use a more generic naming convention. - Removed the 'items' property from the compatible field. - Deleted the description for the reg property. - Dropped clock-names and adjusted the order of clock-names and clocks. - Moved additionalProperties to follow the $ref of out-ports. - Change "atid" type from u32 to int, set it as "-EOPNOTSUPP" for non-AMBA device. - Link to v1: https://lore.kernel.org/r/20250815-itnoc-v1-0-62c8e4f7ad32@oss.qualcomm.com --- Yuanfang Zhang (3): dt-bindings: arm: qcom: Add Coresight Interconnect TNOC coresight-tnoc: add platform driver to support Interconnect TNOC coresight-tnoc: Add runtime PM support for Interconnect TNOC .../bindings/arm/qcom,coresight-itnoc.yaml | 90 +++++++++++++ drivers/hwtracing/coresight/coresight-tnoc.c | 139 +++++++++++++++++++-- 2 files changed, 216 insertions(+), 13 deletions(-) --- base-commit: 2b52cf338d39d684a1c6af298e8204902c026aca change-id: 20250815-itnoc-460273d1b80c Best regards, -- Yuanfang Zhang <yuanfang.zhang(a)oss.qualcomm.com>

4 months, 2 weeks

Re: [PATCH v3 0/3] add sysfs nodes to configure TPDA's registers

by James Clark

On 27/08/2025 11:55 am, Jie Gan wrote: > Patchset 1 introduces configuration of the cross-trigger registers with > appropriate values to enable proper generation of cross-trigger packets. > > Patchset 2 introduces a logic to configure the TPDA_SYNCR register, > which determines the frequency of ASYNC packet generation. These packets > assist userspace tools in accurately identifying each valid packet. > > Patchset 3 introduces a sysfs node to initiate a flush request for the > specific port, forcing the data to synchronize and be transmitted to the > sink device. > > Changes in V3: > 1. Optimizing codes according to James's comment. > Link to V2 - https://lore.kernel.org/all/20250827042042.6786-1-jie.gan@oss.qualcomm.com/ > > Changes in V2: > 1. Refactoring the code based on James's comment for optimization. > Link to V1 - https://lore.kernel.org/all/20250826070150.5603-1-jie.gan@oss.qualcomm.com/ > > Tao Zhang (3): > coresight: tpda: add sysfs nodes for tpda cross-trigger configuration > coresight: tpda: add logic to configure TPDA_SYNCR register > coresight: tpda: add sysfs node to flush specific port > > .../testing/sysfs-bus-coresight-devices-tpda | 50 ++++ > drivers/hwtracing/coresight/coresight-tpda.c | 278 ++++++++++++++++++ > drivers/hwtracing/coresight/coresight-tpda.h | 33 ++- > 3 files changed, 360 insertions(+), 1 deletion(-) > create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > Reviewed-by: James Clark <james.clark(a)linaro.org>

4 months, 3 weeks

Re: [PATCH v2 3/3] coresight: tpda: add sysfs node to flush specific port

by James Clark

On 27/08/2025 10:48 am, Jie Gan wrote: > > > On 8/27/2025 5:17 PM, James Clark wrote: >> >> >> On 27/08/2025 5:20 am, Jie Gan wrote: >>> From: Tao Zhang <tao.zhang(a)oss.qualcomm.com> >>> >>> Setting bit i in the TPDA_FLUSH_CR register initiates a flush request >>> for port i, forcing the data to synchronize and be transmitted to the >>> sink device. >>> >>> Signed-off-by: Tao Zhang <tao.zhang(a)oss.qualcomm.com> >>> Co-developed-by: Jie Gan <jie.gan(a)oss.qualcomm.com> >>> Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> >>> --- >>> .../testing/sysfs-bus-coresight-devices-tpda | 7 ++++ >>> drivers/hwtracing/coresight/coresight-tpda.c | 42 +++++++++++++++++++ >>> drivers/hwtracing/coresight/coresight-tpda.h | 2 + >>> 3 files changed, 51 insertions(+) >>> >>> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices- >>> tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>> index fb651aebeb31..2cf2dcfc13c8 100644 >>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>> @@ -41,3 +41,10 @@ Contact: Jinlong Mao >>> <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qu >>> Description: >>> (RW) Configure the CMB/MCMB channel mode for all enabled >>> ports. >>> Value 0 means raw channel mapping mode. Value 1 means >>> channel pair marking mode. >>> + >>> +What: /sys/bus/coresight/devices/<tpda-name>/port_flush_req >>> +Date: August 2025 >>> +KernelVersion: 6.17 >>> +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang >>> <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> >>> +Description: >>> + (RW) Configure the bit i to requests a flush operation of >>> port i on the TPDA. >>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/ >>> hwtracing/coresight/coresight-tpda.c >>> index 430f76c559f2..8b1fe128881d 100644 >>> --- a/drivers/hwtracing/coresight/coresight-tpda.c >>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c >>> @@ -487,6 +487,47 @@ static ssize_t cmbchan_mode_store(struct device >>> *dev, >>> } >>> static DEVICE_ATTR_RW(cmbchan_mode); >>> +static ssize_t port_flush_req_show(struct device *dev, >>> + struct device_attribute *attr, >>> + char *buf) >>> +{ >>> + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); >>> + unsigned long val; >>> + >>> + if (!drvdata->csdev->refcnt) >>> + return -EINVAL; >>> + >>> + guard(spinlock)(&drvdata->spinlock); >>> + CS_UNLOCK(drvdata->base); >>> + val = readl_relaxed(drvdata->base + TPDA_FLUSH_CR); >>> + CS_LOCK(drvdata->base); >>> + return sysfs_emit(buf, "%lx\n", val); >> >> Still missing the 0x prefix > > Will re-check rest of the codes and add prefix. Sorry I missed it during > the review process. > >> >>> +} >>> + >>> +static ssize_t port_flush_req_store(struct device *dev, >>> + struct device_attribute *attr, >>> + const char *buf, >>> + size_t size) >>> +{ >>> + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); >>> + unsigned long val; >>> + >>> + if (kstrtoul(buf, 0, &val)) >>> + return -EINVAL; >>> + >>> + if (!drvdata->csdev->refcnt || !val) >>> + return -EINVAL; >>> + >>> + val |= FIELD_PREP(TPDA_MAX_INPORTS_MASK, val); >> >> Using FIELD_PREP() now that it's the full width of the register makes >> less sense. Especially when there is no corresponding FIELD_FIT() >> check, which is fine because everything always fits. But if you >> didn't know the mask was the full width you'd wonder if the check is >> missing. >> >> I would just write val directly to TPDA_FLUSH_CR so it's simpler. >> >> It should also have been val = FIELD_PREP(...) > > Yeah, it should have been val = FIELD_PREP(...) here... sorry for the > mistake here.. > > I was thinking the unsigned long here could be 64 or 32 bits and we only > need the value of the lower 32 bits. So that's why I am using val = > FIELD_PREP(...) here. We shouldn't write a value greater than UINT32_MAX > to the register. > > Thanks, > Jie > writel_relaxed() is always 32 bits though so it is a bit confusing if you truncate the user value without an error. Also a reason to use u32 instead of unsigned long types. Are you trying to support arm and arm64 with tpda? Or just arm64? For it to be consistent you can use kstrtou32(), or use kstrtoull() and then FIELD_FIT() to error on truncation. kstrtou32() is probably the cleanest. >> >>> + guard(spinlock)(&drvdata->spinlock); >>> + CS_UNLOCK(drvdata->base); >>> + writel_relaxed(val, drvdata->base + TPDA_FLUSH_CR); >>> + CS_LOCK(drvdata->base); >>> + >>> + return size; >>> +} >>> +static DEVICE_ATTR_RW(port_flush_req); >>> + >>> static struct attribute *tpda_attrs[] = { >>> &dev_attr_trig_async_enable.attr, >>> &dev_attr_trig_flag_ts_enable.attr, >>> @@ -494,6 +535,7 @@ static struct attribute *tpda_attrs[] = { >>> &dev_attr_freq_ts_enable.attr, >>> &dev_attr_global_flush_req.attr, >>> &dev_attr_cmbchan_mode.attr, >>> + &dev_attr_port_flush_req.attr, >>> NULL, >>> }; >>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/ >>> hwtracing/coresight/coresight-tpda.h >>> index 8e1b66115ad1..56d3ad293e46 100644 >>> --- a/drivers/hwtracing/coresight/coresight-tpda.h >>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h >>> @@ -10,6 +10,7 @@ >>> #define TPDA_Pn_CR(n) (0x004 + (n * 4)) >>> #define TPDA_FPID_CR (0x084) >>> #define TPDA_SYNCR (0x08C) >>> +#define TPDA_FLUSH_CR (0x090) >>> /* Cross trigger FREQ packets timestamp bit */ >>> #define TPDA_CR_FREQTS BIT(2) >>> @@ -35,6 +36,7 @@ >>> #define TPDA_SYNCR_MAX_COUNTER_VAL (0xFFF) >>> #define TPDA_MAX_INPORTS 32 >>> +#define TPDA_MAX_INPORTS_MASK GENMASK(31, 0) >>> /* Bits 6 ~ 12 is for atid value */ >>> #define TPDA_CR_ATID GENMASK(12, 6) >> >> >

4 months, 3 weeks

Re: [PATCH v2 2/3] coresight: tpda: add logic to configure TPDA_SYNCR register

by James Clark

On 27/08/2025 5:20 am, Jie Gan wrote: > From: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > > The TPDA_SYNCR register defines the frequency at which TPDA generates > ASYNC packets, enabling userspace tools to accurately parse each valid > packet. > > Signed-off-by: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > Co-developed-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > --- > drivers/hwtracing/coresight/coresight-tpda.c | 7 +++++++ > drivers/hwtracing/coresight/coresight-tpda.h | 6 ++++++ > 2 files changed, 13 insertions(+) > > diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c > index 647ab49a98d7..430f76c559f2 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.c > +++ b/drivers/hwtracing/coresight/coresight-tpda.c > @@ -187,6 +187,13 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata) > */ > if (drvdata->trig_flag_ts) > writel_relaxed(0x0, drvdata->base + TPDA_FPID_CR); > + > + /* Program the counter value for TPDA_SYNCR */ > + val = readl_relaxed(drvdata->base + TPDA_SYNCR); > + /* Clear the mode */ > + val &= ~TPDA_SYNCR_MODE_CTRL; > + val |= FIELD_PREP(TPDA_SYNCR_COUNTER_MASK, TPDA_SYNCR_MAX_COUNTER_VAL); Just use the mask directly if you want to set all the bits. This makes it seem like the MAX_COUNTER_VAL is something different. val |= TPDA_SYNCR_COUNTER_MASK > + writel_relaxed(val, drvdata->base + TPDA_SYNCR); > } > > static int tpda_enable_port(struct tpda_drvdata *drvdata, int port) > diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h > index 0be625fb52fd..8e1b66115ad1 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.h > +++ b/drivers/hwtracing/coresight/coresight-tpda.h > @@ -9,6 +9,7 @@ > #define TPDA_CR (0x000) > #define TPDA_Pn_CR(n) (0x004 + (n * 4)) > #define TPDA_FPID_CR (0x084) > +#define TPDA_SYNCR (0x08C) > > /* Cross trigger FREQ packets timestamp bit */ > #define TPDA_CR_FREQTS BIT(2) > @@ -27,6 +28,11 @@ > #define TPDA_Pn_CR_CMBSIZE GENMASK(7, 6) > /* Aggregator port DSB data set element size bit */ > #define TPDA_Pn_CR_DSBSIZE BIT(8) > +/* TPDA_SYNCR mode control bit */ > +#define TPDA_SYNCR_MODE_CTRL BIT(12) > +/* TPDA_SYNCR counter mask */ > +#define TPDA_SYNCR_COUNTER_MASK GENMASK(11, 0) > +#define TPDA_SYNCR_MAX_COUNTER_VAL (0xFFF) No need to define a numeric value that's the same as the mask. It also opens the possibility of making a mistake. > > #define TPDA_MAX_INPORTS 32 >

4 months, 3 weeks

Re: [PATCH v2 3/3] coresight: tpda: add sysfs node to flush specific port

by James Clark

On 27/08/2025 5:20 am, Jie Gan wrote: > From: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > > Setting bit i in the TPDA_FLUSH_CR register initiates a flush request > for port i, forcing the data to synchronize and be transmitted to the > sink device. > > Signed-off-by: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > Co-developed-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > --- > .../testing/sysfs-bus-coresight-devices-tpda | 7 ++++ > drivers/hwtracing/coresight/coresight-tpda.c | 42 +++++++++++++++++++ > drivers/hwtracing/coresight/coresight-tpda.h | 2 + > 3 files changed, 51 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > index fb651aebeb31..2cf2dcfc13c8 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > @@ -41,3 +41,10 @@ Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qu > Description: > (RW) Configure the CMB/MCMB channel mode for all enabled ports. > Value 0 means raw channel mapping mode. Value 1 means channel pair marking mode. > + > +What: /sys/bus/coresight/devices/<tpda-name>/port_flush_req > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Configure the bit i to requests a flush operation of port i on the TPDA. > diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c > index 430f76c559f2..8b1fe128881d 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.c > +++ b/drivers/hwtracing/coresight/coresight-tpda.c > @@ -487,6 +487,47 @@ static ssize_t cmbchan_mode_store(struct device *dev, > } > static DEVICE_ATTR_RW(cmbchan_mode); > > +static ssize_t port_flush_req_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (!drvdata->csdev->refcnt) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + CS_UNLOCK(drvdata->base); > + val = readl_relaxed(drvdata->base + TPDA_FLUSH_CR); > + CS_LOCK(drvdata->base); > + return sysfs_emit(buf, "%lx\n", val); Still missing the 0x prefix > +} > + > +static ssize_t port_flush_req_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (kstrtoul(buf, 0, &val)) > + return -EINVAL; > + > + if (!drvdata->csdev->refcnt || !val) > + return -EINVAL; > + > + val |= FIELD_PREP(TPDA_MAX_INPORTS_MASK, val); Using FIELD_PREP() now that it's the full width of the register makes less sense. Especially when there is no corresponding FIELD_FIT() check, which is fine because everything always fits. But if you didn't know the mask was the full width you'd wonder if the check is missing. I would just write val directly to TPDA_FLUSH_CR so it's simpler. It should also have been val = FIELD_PREP(...) > + guard(spinlock)(&drvdata->spinlock); > + CS_UNLOCK(drvdata->base); > + writel_relaxed(val, drvdata->base + TPDA_FLUSH_CR); > + CS_LOCK(drvdata->base); > + > + return size; > +} > +static DEVICE_ATTR_RW(port_flush_req); > + > static struct attribute *tpda_attrs[] = { > &dev_attr_trig_async_enable.attr, > &dev_attr_trig_flag_ts_enable.attr, > @@ -494,6 +535,7 @@ static struct attribute *tpda_attrs[] = { > &dev_attr_freq_ts_enable.attr, > &dev_attr_global_flush_req.attr, > &dev_attr_cmbchan_mode.attr, > + &dev_attr_port_flush_req.attr, > NULL, > }; > > diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h > index 8e1b66115ad1..56d3ad293e46 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.h > +++ b/drivers/hwtracing/coresight/coresight-tpda.h > @@ -10,6 +10,7 @@ > #define TPDA_Pn_CR(n) (0x004 + (n * 4)) > #define TPDA_FPID_CR (0x084) > #define TPDA_SYNCR (0x08C) > +#define TPDA_FLUSH_CR (0x090) > > /* Cross trigger FREQ packets timestamp bit */ > #define TPDA_CR_FREQTS BIT(2) > @@ -35,6 +36,7 @@ > #define TPDA_SYNCR_MAX_COUNTER_VAL (0xFFF) > > #define TPDA_MAX_INPORTS 32 > +#define TPDA_MAX_INPORTS_MASK GENMASK(31, 0) > > /* Bits 6 ~ 12 is for atid value */ > #define TPDA_CR_ATID GENMASK(12, 6)

4 months, 3 weeks

Re: [PATCH v2 1/3] coresight: tpda: add sysfs nodes for tpda cross-trigger configuration

by James Clark

On 27/08/2025 5:20 am, Jie Gan wrote: > From: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > > Introduce sysfs nodes to configure cross-trigger parameters for TPDA. > These registers define the characteristics of cross-trigger packets, > including generation frequency and flag values. > > Signed-off-by: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > Co-developed-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > --- > .../testing/sysfs-bus-coresight-devices-tpda | 43 ++++ > drivers/hwtracing/coresight/coresight-tpda.c | 227 ++++++++++++++++++ > drivers/hwtracing/coresight/coresight-tpda.h | 27 ++- > 3 files changed, 296 insertions(+), 1 deletion(-) > create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > new file mode 100644 > index 000000000000..fb651aebeb31 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > @@ -0,0 +1,43 @@ > +What: /sys/bus/coresight/devices/<tpda-name>/trig_async_enable > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Enable/disable cross trigger synchronization sequence interface. > + > +What: /sys/bus/coresight/devices/<tpda-name>/trig_flag_ts_enable > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Enable/disable cross trigger FLAG packet request interface. > + > +What: /sys/bus/coresight/devices/<tpda-name>/trig_freq_enable > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Enable/disable cross trigger FREQ packet request interface. > + > +What: /sys/bus/coresight/devices/<tpda-name>/freq_ts_enable > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Enable/disable the timestamp for all FREQ packets. > + > +What: /sys/bus/coresight/devices/<tpda-name>/global_flush_req > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Set global (all ports) flush request bit. The bit remains set until a > + global flush request sequence completes. > + > +What: /sys/bus/coresight/devices/<tpda-name>/cmbchan_mode > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Configure the CMB/MCMB channel mode for all enabled ports. > + Value 0 means raw channel mapping mode. Value 1 means channel pair marking mode. > diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c > index 4e93fa5bace4..647ab49a98d7 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.c > +++ b/drivers/hwtracing/coresight/coresight-tpda.c > @@ -156,9 +156,37 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata) > u32 val; > > val = readl_relaxed(drvdata->base + TPDA_CR); > + val &= ~TPDA_CR_MID; > val &= ~TPDA_CR_ATID; > val |= FIELD_PREP(TPDA_CR_ATID, drvdata->atid); > + if (drvdata->trig_async) > + val |= TPDA_CR_SRIE; > + else > + val &= ~TPDA_CR_SRIE; > + if (drvdata->trig_flag_ts) > + val |= TPDA_CR_FLRIE; > + else > + val &= ~TPDA_CR_FLRIE; > + if (drvdata->trig_freq) > + val |= TPDA_CR_FRIE; > + else > + val &= ~TPDA_CR_FRIE; > + if (drvdata->freq_ts) > + val |= TPDA_CR_FREQTS; > + else > + val &= ~TPDA_CR_FREQTS; > + if (drvdata->cmbchan_mode) > + val |= TPDA_CR_CMBCHANMODE; > + else > + val &= ~TPDA_CR_CMBCHANMODE; > writel_relaxed(val, drvdata->base + TPDA_CR); > + > + /* > + * If FLRIE bit is set, set the master and channel > + * id as zero > + */ > + if (drvdata->trig_flag_ts) > + writel_relaxed(0x0, drvdata->base + TPDA_FPID_CR); > } > > static int tpda_enable_port(struct tpda_drvdata *drvdata, int port) > @@ -274,6 +302,203 @@ static const struct coresight_ops tpda_cs_ops = { > .link_ops = &tpda_link_ops, > }; > > +static ssize_t trig_async_enable_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + > + return sysfs_emit(buf, "%u\n", (unsigned int)drvdata->trig_async); > +} > + > +static ssize_t trig_async_enable_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (kstrtoul(buf, 0, &val)) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + drvdata->trig_async = !!val; > + > + return size; > +} > +static DEVICE_ATTR_RW(trig_async_enable); > + > +static ssize_t trig_flag_ts_enable_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + > + return sysfs_emit(buf, "%u\n", (unsigned int)drvdata->trig_flag_ts); > +} > + > +static ssize_t trig_flag_ts_enable_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (kstrtoul(buf, 0, &val)) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + drvdata->trig_flag_ts = !!val; > + > + return size; > +} > +static DEVICE_ATTR_RW(trig_flag_ts_enable); > + > +static ssize_t trig_freq_enable_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + > + return sysfs_emit(buf, "%u\n", (unsigned int)drvdata->trig_freq); > +} > + > +static ssize_t trig_freq_enable_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (kstrtoul(buf, 0, &val)) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + drvdata->trig_freq = !!val; > + > + return size; > +} > +static DEVICE_ATTR_RW(trig_freq_enable); > + > +static ssize_t freq_ts_enable_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + > + return sysfs_emit(buf, "%u\n", (unsigned int)drvdata->freq_ts); > +} > + > +static ssize_t freq_ts_enable_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (kstrtoul(buf, 0, &val)) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + drvdata->freq_ts = !!val; > + > + return size; > +} > +static DEVICE_ATTR_RW(freq_ts_enable); > + > +static ssize_t global_flush_req_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (!drvdata->csdev->refcnt) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + CS_UNLOCK(drvdata->base); > + val = readl_relaxed(drvdata->base + TPDA_CR); > + CS_LOCK(drvdata->base); > + > + return sysfs_emit(buf, "%lx\n", val); I know in practice it's probably only either 0 or 1, but this should either be decimal or have the 0x prefix otherwise it looks like a mistake. > +} > + > +static ssize_t global_flush_req_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (kstrtoul(buf, 0, &val)) > + return -EINVAL; > + > + if (!drvdata->csdev->refcnt || !val) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + CS_UNLOCK(drvdata->base); > + val = readl_relaxed(drvdata->base + TPDA_CR); > + val |= BIT(0); If you only set bit 0 do you only want to show bit 0 in global_flush_req_show() above? The sysfs files should be divided up by function rather than dumping the whole register, otherwise tools need their own copy of the fields to interperet them.

4 months, 3 weeks

Re: [PATCH v1 3/3] coresight: tpda: add sysfs node to flush specific port

by James Clark

On 26/08/2025 1:11 pm, Jie Gan wrote: > > > On 8/26/2025 5:54 PM, James Clark wrote: >> >> >> On 26/08/2025 10:39 am, Jie Gan wrote: >>> >>> >>> On 8/26/2025 5:27 PM, James Clark wrote: >>>> >>>> >>>> On 26/08/2025 8:01 am, Jie Gan wrote: >>>>> From: Tao Zhang <tao.zhang(a)oss.qualcomm.com> >>>>> >>>>> Setting bit i in the TPDA_FLUSH_CR register initiates a flush request >>>>> for port i, forcing the data to synchronize and be transmitted to the >>>>> sink device. >>>>> >>>>> Signed-off-by: Tao Zhang <tao.zhang(a)oss.qualcomm.com> >>>>> Co-developed-by: Jie Gan <jie.gan(a)oss.qualcomm.com> >>>>> Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> >>>>> --- >>>>> .../testing/sysfs-bus-coresight-devices-tpda | 7 +++ >>>>> drivers/hwtracing/coresight/coresight-tpda.c | 45 ++++++++++++++ >>>>> + ++++ >>>>> drivers/hwtracing/coresight/coresight-tpda.h | 1 + >>>>> 3 files changed, 53 insertions(+) >>>>> >>>>> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices- >>>>> tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>>>> index e827396a0fa1..8803158ba42f 100644 >>>>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>>>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>>>> @@ -41,3 +41,10 @@ Contact: Jinlong Mao >>>>> <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qu >>>>> Description: >>>>> (RW) Configure the CMB/MCMB channel mode for all enabled >>>>> ports. >>>>> Value 0 means raw channel mapping mode. Value 1 means >>>>> channel pair marking mode. >>>>> + >>>>> +What: /sys/bus/coresight/devices/<tpda-name>/port_flush_req >>>>> +Date: August 2025 >>>>> +KernelVersion: 6.17 >>>>> +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang >>>>> <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> >>>>> +Description: >>>>> + (RW) Configure the bit i to requests a flush operation of >>>>> port i on the TPDA. >>>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/ >>>>> drivers/ hwtracing/coresight/coresight-tpda.c >>>>> index 9e623732d1e7..c5f169facc51 100644 >>>>> --- a/drivers/hwtracing/coresight/coresight-tpda.c >>>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c >>>>> @@ -509,6 +509,50 @@ static ssize_t cmbchan_mode_store(struct >>>>> device *dev, >>>>> } >>>>> static DEVICE_ATTR_RW(cmbchan_mode); >>>>> +static ssize_t port_flush_req_show(struct device *dev, >>>>> + struct device_attribute *attr, >>>>> + char *buf) >>>>> +{ >>>>> + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); >>>>> + unsigned long val; >>>>> + >>>>> + guard(spinlock)(&drvdata->spinlock); >>>>> + if (!drvdata->csdev->refcnt) >>>>> + return -EPERM; >>>>> + >>>>> + val = readl_relaxed(drvdata->base + TPDA_FLUSH_CR); >>>>> + return sysfs_emit(buf, "%lx\n", val); >>>> >>>> Decimal would be better for a port number that goes from 0 - 127. If >>>> you really want to use hex then don't you need to prefix it with 0x? >>>> Otherwise you can't tell the difference between decimal 10 and hex >>>> 10, and it's not documented that it's hex either. >>>> >>> >>> Got it. I will fix the code here, and update the description in >>> document. >>> >>>>> +} >>>>> + >>>>> +static ssize_t port_flush_req_store(struct device *dev, >>>>> + struct device_attribute *attr, >>>>> + const char *buf, >>>>> + size_t size) >>>>> +{ >>>>> + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); >>>>> + unsigned long val; >>>>> + >>>>> + if (kstrtoul(buf, 0, &val)) >>>>> + return -EINVAL; >>>>> + >>>>> + /* The valid value ranges from 0 to 127 */ >>>>> + if (val > 127) >>>>> + return -EINVAL; >>>>> + >>>>> + guard(spinlock)(&drvdata->spinlock); >>>>> + if (!drvdata->csdev->refcnt) >>>>> + return -EPERM; >>>>> + >>>>> + if (val) { >>>> >>>> If 0 - 127 are valid don't you want to write 0 too? >>> >>> It's 1-127 here. 0 may leads to an unexpected issue here. >>> >>> Thanks, >>> Jie >>> >> >> Then can't the above be this: >> >> /* The valid value ranges from 1 to 127 */ >> if (val < 1 || val > 127) >> return -EINVAL; >> >> But I'm wondering how you flush port 0? >> > > BIT(0) represents port 0 with value 1 and the default value 0 means > nothing will be triggered here. > >> Isn't the default value 0? So if you never write to port_flush_req >> then you'd flush port 0, but why can't you change it back to 0 after >> writing a different value? > > We can change the value back to 0 but I think we shouldn't do this > although I haven't suffer issue after I changed it back to 0(for bit). > Because the document mentioned: "Once set, the bit remains set until the > flush operation on port i completes and the bit then clears to 0". So I > think we should let the flush operation finish as expected and clear the > bit by itself? Or may suffer unexpected error when try to interrupt the > flush operation? > > Thanks, > Jie Oh I see, I thought this was a port number, not a bit for each port. That changes this and my other comment about changing the output to be decimal then. Hex is probably better but it needs the 0x prefix. I would also treat 0 as EINVAL. It doesn't do anything different to any other out of range request so it should be treated the same way. Then comparing to 127 isn't that obvious either. Something like FIELD_FITS() more clearly states that values have to fit into a bitfield rather than be less than some value: if (!val || !FIELD_FIT(TPDA_FLUSH_CR_PORTNUM, val)) return -EINVAL; > >>> >>>>> + CS_UNLOCK(drvdata->base); >>>>> + writel_relaxed(val, drvdata->base + TPDA_FLUSH_CR); >>>>> + CS_LOCK(drvdata->base); >>>>> + } >>>>> + >>>>> + return size; >>>>> +} >>>>> +static DEVICE_ATTR_RW(port_flush_req); >>>>> + >>>>> static struct attribute *tpda_attrs[] = { >>>>> &dev_attr_trig_async_enable.attr, >>>>> &dev_attr_trig_flag_ts_enable.attr, >>>>> @@ -516,6 +560,7 @@ static struct attribute *tpda_attrs[] = { >>>>> &dev_attr_freq_ts_enable.attr, >>>>> &dev_attr_global_flush_req.attr, >>>>> &dev_attr_cmbchan_mode.attr, >>>>> + &dev_attr_port_flush_req.attr, >>>>> NULL, >>>>> }; >>>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/ >>>>> drivers/ hwtracing/coresight/coresight-tpda.h >>>>> index 00d146960d81..55a18d718357 100644 >>>>> --- a/drivers/hwtracing/coresight/coresight-tpda.h >>>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h >>>>> @@ -10,6 +10,7 @@ >>>>> #define TPDA_Pn_CR(n) (0x004 + (n * 4)) >>>>> #define TPDA_FPID_CR (0x084) >>>>> #define TPDA_SYNCR (0x08C) >>>>> +#define TPDA_FLUSH_CR (0x090) >>>>> /* Cross trigger FREQ packets timestamp bit */ >>>>> #define TPDA_CR_FREQTS BIT(2) >>>> >>>> >>> >> >> >

4 months, 3 weeks

Re: [PATCH v1 3/3] coresight: tpda: add sysfs node to flush specific port

by James Clark

On 26/08/2025 10:39 am, Jie Gan wrote: > > > On 8/26/2025 5:27 PM, James Clark wrote: >> >> >> On 26/08/2025 8:01 am, Jie Gan wrote: >>> From: Tao Zhang <tao.zhang(a)oss.qualcomm.com> >>> >>> Setting bit i in the TPDA_FLUSH_CR register initiates a flush request >>> for port i, forcing the data to synchronize and be transmitted to the >>> sink device. >>> >>> Signed-off-by: Tao Zhang <tao.zhang(a)oss.qualcomm.com> >>> Co-developed-by: Jie Gan <jie.gan(a)oss.qualcomm.com> >>> Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> >>> --- >>> .../testing/sysfs-bus-coresight-devices-tpda | 7 +++ >>> drivers/hwtracing/coresight/coresight-tpda.c | 45 +++++++++++++++++++ >>> drivers/hwtracing/coresight/coresight-tpda.h | 1 + >>> 3 files changed, 53 insertions(+) >>> >>> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices- >>> tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>> index e827396a0fa1..8803158ba42f 100644 >>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda >>> @@ -41,3 +41,10 @@ Contact: Jinlong Mao >>> <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qu >>> Description: >>> (RW) Configure the CMB/MCMB channel mode for all enabled >>> ports. >>> Value 0 means raw channel mapping mode. Value 1 means >>> channel pair marking mode. >>> + >>> +What: /sys/bus/coresight/devices/<tpda-name>/port_flush_req >>> +Date: August 2025 >>> +KernelVersion: 6.17 >>> +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang >>> <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> >>> +Description: >>> + (RW) Configure the bit i to requests a flush operation of >>> port i on the TPDA. >>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/ >>> hwtracing/coresight/coresight-tpda.c >>> index 9e623732d1e7..c5f169facc51 100644 >>> --- a/drivers/hwtracing/coresight/coresight-tpda.c >>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c >>> @@ -509,6 +509,50 @@ static ssize_t cmbchan_mode_store(struct device >>> *dev, >>> } >>> static DEVICE_ATTR_RW(cmbchan_mode); >>> +static ssize_t port_flush_req_show(struct device *dev, >>> + struct device_attribute *attr, >>> + char *buf) >>> +{ >>> + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); >>> + unsigned long val; >>> + >>> + guard(spinlock)(&drvdata->spinlock); >>> + if (!drvdata->csdev->refcnt) >>> + return -EPERM; >>> + >>> + val = readl_relaxed(drvdata->base + TPDA_FLUSH_CR); >>> + return sysfs_emit(buf, "%lx\n", val); >> >> Decimal would be better for a port number that goes from 0 - 127. If >> you really want to use hex then don't you need to prefix it with 0x? >> Otherwise you can't tell the difference between decimal 10 and hex 10, >> and it's not documented that it's hex either. >> > > Got it. I will fix the code here, and update the description in document. > >>> +} >>> + >>> +static ssize_t port_flush_req_store(struct device *dev, >>> + struct device_attribute *attr, >>> + const char *buf, >>> + size_t size) >>> +{ >>> + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); >>> + unsigned long val; >>> + >>> + if (kstrtoul(buf, 0, &val)) >>> + return -EINVAL; >>> + >>> + /* The valid value ranges from 0 to 127 */ >>> + if (val > 127) >>> + return -EINVAL; >>> + >>> + guard(spinlock)(&drvdata->spinlock); >>> + if (!drvdata->csdev->refcnt) >>> + return -EPERM; >>> + >>> + if (val) { >> >> If 0 - 127 are valid don't you want to write 0 too? > > It's 1-127 here. 0 may leads to an unexpected issue here. > > Thanks, > Jie > Then can't the above be this: /* The valid value ranges from 1 to 127 */ if (val < 1 || val > 127) return -EINVAL; But I'm wondering how you flush port 0? Isn't the default value 0? So if you never write to port_flush_req then you'd flush port 0, but why can't you change it back to 0 after writing a different value? >> >>> + CS_UNLOCK(drvdata->base); >>> + writel_relaxed(val, drvdata->base + TPDA_FLUSH_CR); >>> + CS_LOCK(drvdata->base); >>> + } >>> + >>> + return size; >>> +} >>> +static DEVICE_ATTR_RW(port_flush_req); >>> + >>> static struct attribute *tpda_attrs[] = { >>> &dev_attr_trig_async_enable.attr, >>> &dev_attr_trig_flag_ts_enable.attr, >>> @@ -516,6 +560,7 @@ static struct attribute *tpda_attrs[] = { >>> &dev_attr_freq_ts_enable.attr, >>> &dev_attr_global_flush_req.attr, >>> &dev_attr_cmbchan_mode.attr, >>> + &dev_attr_port_flush_req.attr, >>> NULL, >>> }; >>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/ >>> hwtracing/coresight/coresight-tpda.h >>> index 00d146960d81..55a18d718357 100644 >>> --- a/drivers/hwtracing/coresight/coresight-tpda.h >>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h >>> @@ -10,6 +10,7 @@ >>> #define TPDA_Pn_CR(n) (0x004 + (n * 4)) >>> #define TPDA_FPID_CR (0x084) >>> #define TPDA_SYNCR (0x08C) >>> +#define TPDA_FLUSH_CR (0x090) >>> /* Cross trigger FREQ packets timestamp bit */ >>> #define TPDA_CR_FREQTS BIT(2) >> >> >

4 months, 3 weeks

Re: [PATCH v1 3/3] coresight: tpda: add sysfs node to flush specific port

by James Clark

On 26/08/2025 8:01 am, Jie Gan wrote: > From: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > > Setting bit i in the TPDA_FLUSH_CR register initiates a flush request > for port i, forcing the data to synchronize and be transmitted to the > sink device. > > Signed-off-by: Tao Zhang <tao.zhang(a)oss.qualcomm.com> > Co-developed-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > --- > .../testing/sysfs-bus-coresight-devices-tpda | 7 +++ > drivers/hwtracing/coresight/coresight-tpda.c | 45 +++++++++++++++++++ > drivers/hwtracing/coresight/coresight-tpda.h | 1 + > 3 files changed, 53 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > index e827396a0fa1..8803158ba42f 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda > @@ -41,3 +41,10 @@ Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qu > Description: > (RW) Configure the CMB/MCMB channel mode for all enabled ports. > Value 0 means raw channel mapping mode. Value 1 means channel pair marking mode. > + > +What: /sys/bus/coresight/devices/<tpda-name>/port_flush_req > +Date: August 2025 > +KernelVersion: 6.17 > +Contact: Jinlong Mao <jinlong.mao(a)oss.qualcomm.com>, Tao Zhang <tao.zhang(a)oss.qualcomm.com>, Jie Gan <jie.gan(a)oss.qualcomm.com> > +Description: > + (RW) Configure the bit i to requests a flush operation of port i on the TPDA. > diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c > index 9e623732d1e7..c5f169facc51 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.c > +++ b/drivers/hwtracing/coresight/coresight-tpda.c > @@ -509,6 +509,50 @@ static ssize_t cmbchan_mode_store(struct device *dev, > } > static DEVICE_ATTR_RW(cmbchan_mode); > > +static ssize_t port_flush_req_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + guard(spinlock)(&drvdata->spinlock); > + if (!drvdata->csdev->refcnt) > + return -EPERM; > + > + val = readl_relaxed(drvdata->base + TPDA_FLUSH_CR); > + return sysfs_emit(buf, "%lx\n", val); Decimal would be better for a port number that goes from 0 - 127. If you really want to use hex then don't you need to prefix it with 0x? Otherwise you can't tell the difference between decimal 10 and hex 10, and it's not documented that it's hex either. > +} > + > +static ssize_t port_flush_req_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t size) > +{ > + struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent); > + unsigned long val; > + > + if (kstrtoul(buf, 0, &val)) > + return -EINVAL; > + > + /* The valid value ranges from 0 to 127 */ > + if (val > 127) > + return -EINVAL; > + > + guard(spinlock)(&drvdata->spinlock); > + if (!drvdata->csdev->refcnt) > + return -EPERM; > + > + if (val) { If 0 - 127 are valid don't you want to write 0 too? > + CS_UNLOCK(drvdata->base); > + writel_relaxed(val, drvdata->base + TPDA_FLUSH_CR); > + CS_LOCK(drvdata->base); > + } > + > + return size; > +} > +static DEVICE_ATTR_RW(port_flush_req); > + > static struct attribute *tpda_attrs[] = { > &dev_attr_trig_async_enable.attr, > &dev_attr_trig_flag_ts_enable.attr, > @@ -516,6 +560,7 @@ static struct attribute *tpda_attrs[] = { > &dev_attr_freq_ts_enable.attr, > &dev_attr_global_flush_req.attr, > &dev_attr_cmbchan_mode.attr, > + &dev_attr_port_flush_req.attr, > NULL, > }; > > diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h > index 00d146960d81..55a18d718357 100644 > --- a/drivers/hwtracing/coresight/coresight-tpda.h > +++ b/drivers/hwtracing/coresight/coresight-tpda.h > @@ -10,6 +10,7 @@ > #define TPDA_Pn_CR(n) (0x004 + (n * 4)) > #define TPDA_FPID_CR (0x084) > #define TPDA_SYNCR (0x08C) > +#define TPDA_FLUSH_CR (0x090) > > /* Cross trigger FREQ packets timestamp bit */ > #define TPDA_CR_FREQTS BIT(2)

4 months, 3 weeks

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