CoreSight July 2025

coresight@lists.linaro.org

9 participants
39 discussions

Re: [PATCH v4] coresight: Replace scnprintf() with sysfs_emit() in sysfs show functions

by Suzuki K Poulose

On 19/07/2025 23:45, Chelsy Ratnawat wrote: > Documentation/filesystems/sysfs.rst mentions that show() should only > use sysfs_emit() or sysfs_emit_at() when formating the value to be > returned to user space. So replace scnprintf() with sysfs_emit(). > > Signed-off-by: Chelsy Ratnawat <chelsyratnawat2001(a)gmail.com> > --- > Changes in v4: > - Applied changes to 5 more files to replace sprintf/scnprintf with > sysfs_emit() and sysfs_emit_at() Please could you rebase this on coresight tree "next" branch ? There are conflicts. https://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git/log/?h=… Suzuki

1 day, 13 hours

[PATCH v2 0/3] Coresight TMC-ETR some bugfixes and cleanups

by Junhao He

This patchset builds upon Yicong's previous patches [1]. Introducing fix two race issues found by using TMC-ETR and CATU, Two cleanups found when debugging the issues. [1] https://lore.kernel.org/linux-arm-kernel/20241202092419.11777-1-yangyicong@… --- Changes in v2: - Updated the commit of patch2. - Rebase to v6.16-rc1 Junhao He (1): coresight: tmc: refactor the tmc-etr mode setting to avoid race conditions Yicong Yang (2): coresight: tmc: Add missing doc of tmc_drvdata::reading coresight: tmc: Decouple the perf buffer allocation from sysfs mode .../hwtracing/coresight/coresight-tmc-etr.c | 102 +++++++++--------- drivers/hwtracing/coresight/coresight-tmc.h | 1 + 2 files changed, 53 insertions(+), 50 deletions(-) -- 2.33.0

1 day, 15 hours

[PATCH v3 0/6] Refactoring finding CPU phandles in DT

by Alireza Sanaee

This series refactor the way CPU IDs are retrieved from the device tree. Usually, there is a for loop that goes over every single CPU that can be avoided. This also reduces the amount of NULL pointer checks in drivers. I have abstracted away that loop and introduced a new function (of_cpu_node_to_id) for this. This patchset is a subset of [1], where I removed content and patches relevant to hyper-threaded cores for DT. Based on the discussion, the code refactor is still useful, hence this patchset. [1] https://lore.kernel.org/all/20250512080715.82-1-alireza.sanaee@huawei.co Changes since v2: - Addressed Jonathan Cameron's comments. - Added reviewed-by tags. - Added a new commit where I suggest simplfing the code in arch_topology.c to remove the use of cpu_node on failure path. - Improve documentation. - Caught a bug in patch 1. - Commit message fixed for patch 2. Changes since v1: - Rebased on top of the latest mainline. - Addressed Krzysztof Kozlowski's comments -- Hopefully :-) - Addressed Jonathan Cameron's comments. Alireza Sanaee (6): of: add infra for finding CPU id from phandle arch_topology: drop the use of cpu_node in the pr_info arch_topology: update CPU map to use of_cpu_phandle_to_id coresight: cti: Use of_cpu_phandle_to_id for grabbing CPU id coresight: Use of_cpu_phandle_to_id for grabbing CPU ID perf/arm-dsu: refactor cpu id retrieval via new API of_cpu_phandle_to_id drivers/base/arch_topology.c | 22 ++++----- .../coresight/coresight-cti-platform.c | 13 +---- .../hwtracing/coresight/coresight-platform.c | 15 +----- drivers/of/cpu.c | 49 +++++++++++++++++++ drivers/perf/arm_dsu_pmu.c | 7 +-- include/linux/of.h | 9 ++++ 6 files changed, 72 insertions(+), 43 deletions(-) -- 2.43.0

4 days, 8 hours

Re: [PATCH next] coresight: Fix a NULL vs IS_ERR() bug in probe

by Mike Leach

On Wed, 16 Jul 2025 at 20:38, Dan Carpenter <dan.carpenter(a)linaro.org> wrote: > > The devm_ioremap_resource() function returns error pointers on error. > It never returns NULL. Update the error checking to match. > > Fixes: 26e20622a8ae ("coresight: add coresight Trace Network On Chip driver") > Signed-off-by: Dan Carpenter <dan.carpenter(a)linaro.org> > --- > drivers/hwtracing/coresight/coresight-tnoc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c > index 0e4164707eea..d542df46ea39 100644 > --- a/drivers/hwtracing/coresight/coresight-tnoc.c > +++ b/drivers/hwtracing/coresight/coresight-tnoc.c > @@ -183,8 +183,8 @@ static int trace_noc_probe(struct amba_device *adev, const struct amba_id *id) > dev_set_drvdata(dev, drvdata); > > drvdata->base = devm_ioremap_resource(dev, &adev->res); > - if (!drvdata->base) > - return -ENOMEM; > + if (IS_ERR(drvdata->base)) > + return PTR_ERR(drvdata->base); > > spin_lock_init(&drvdata->spinlock); > > -- > 2.47.2 > Reviewed-by: Mike Leach <mike.leach(a)linaro.org> -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

4 days, 8 hours

Re: [PATCH v3 RESEND 02/10] coresight: core: add a new API to retrieve the helper device

by Mike Leach

Hi, On Mon, 14 Jul 2025 at 07:31, Jie Gan <jie.gan(a)oss.qualcomm.com> wrote: > > Retrieving the helper device of the specific coresight device based on > its helper_subtype because a single coresight device may has multiple types > of the helper devices. > > Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > --- > drivers/hwtracing/coresight/coresight-core.c | 30 ++++++++++++++++++++ > drivers/hwtracing/coresight/coresight-priv.h | 2 ++ > 2 files changed, 32 insertions(+) > > diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c > index 5297a5ff7921..76e10c36a8a1 100644 > --- a/drivers/hwtracing/coresight/coresight-core.c > +++ b/drivers/hwtracing/coresight/coresight-core.c > @@ -580,6 +580,36 @@ struct coresight_device *coresight_get_sink(struct coresight_path *path) > } > EXPORT_SYMBOL_GPL(coresight_get_sink); > > +/** > + * coresight_get_helper: find the helper device of the assigned csdev. > + * > + * @csdev: The csdev the helper device is conntected to. > + * @type: helper_subtype of the expected helper device. > + * > + * Retrieve the helper device for the specific csdev based on its > + * helper_subtype. > + * > + * Return: the helper's csdev upon success or NULL for fail. > + */ > +struct coresight_device *coresight_get_helper(struct coresight_device *csdev, > + int type) > +{ > + int i; > + struct coresight_device *helper; > + > + for (i = 0; i < csdev->pdata->nr_outconns; ++i) { > + helper = csdev->pdata->out_conns[i]->dest_dev; > + if (!helper || !coresight_is_helper(helper)) > + continue; > + Manipulating the connections list almost certainly requires some locking. See other functions in this file Mike > + if (helper->subtype.helper_subtype == type) > + return helper; > + } > + > + return NULL; > +} > +EXPORT_SYMBOL_GPL(coresight_get_helper); > + > /** > * coresight_get_port_helper: get the in-port number of the helper device > * that is connected to the csdev. > diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h > index 07a5f03de81d..5b912eb60401 100644 > --- a/drivers/hwtracing/coresight/coresight-priv.h > +++ b/drivers/hwtracing/coresight/coresight-priv.h > @@ -158,6 +158,8 @@ void coresight_path_assign_trace_id(struct coresight_path *path, > enum cs_mode mode); > int coresight_get_port_helper(struct coresight_device *csdev, > struct coresight_device *helper); > +struct coresight_device *coresight_get_helper(struct coresight_device *csdev, > + int type); > > #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM3X) > int etm_readl_cp14(u32 off, unsigned int *val); > -- > 2.34.1 > -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

4 days, 13 hours

[PATCH v9 0/2] coresight: Add label sysfs node support

by Mao Jinlong

Change since V8: 1. Add label in all documentations of coresight components. 2. Add control of the visibility of the label sysfs attribute. V8 link: https://lkml.org/lkml/2025/7/3/985 Change since V7: 1. Update the conflict when apply to coresight next. 2. Update the Date and version in ABI file. V7 link: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20250226121926.… Change since V6: 1. Update the date and verison in ABI file. Change since V5: 1. Update the kernel version of ABI files. 2. Add link of different patch versions. V5 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20241210122253.319… Change since V4: 1. Add label in DT and add label sysfs node for each coresight device. V4 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20240703122340.268… Change since V3: 1. Change device-name to arm,cs-dev-name. 2. Add arm,cs-dev-name to only CTI and sources' dt-binding. V3 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20240131082628.628… Change since V2: 1. Fix the error in coresight core. drivers/hwtracing/coresight/coresight-core.c:1775:7: error: assigning to 'char *' from 'const char *' discards qualifiers 2. Fix the warning when run dtbinding check. Documentation/devicetree/bindings/arm/arm,coresight-cpu-debug.yaml: device-name: missing type definition V2 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20240115164252.265… Change since V1: 1. Change coresight-name to device name. 2. Add the device-name in coresight dt bindings. V1 link: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20230208110716.… Mao Jinlong (2): dt-bindings: arm: Add label in the coresight components coresight: Add label sysfs node support .../testing/sysfs-bus-coresight-devices-cti | 6 ++ .../sysfs-bus-coresight-devices-dummy-source | 6 ++ .../testing/sysfs-bus-coresight-devices-etb10 | 6 ++ .../testing/sysfs-bus-coresight-devices-etm3x | 6 ++ .../testing/sysfs-bus-coresight-devices-etm4x | 6 ++ .../sysfs-bus-coresight-devices-funnel | 6 ++ .../testing/sysfs-bus-coresight-devices-stm | 6 ++ .../testing/sysfs-bus-coresight-devices-tmc | 6 ++ .../testing/sysfs-bus-coresight-devices-tpdm | 6 ++ .../testing/sysfs-bus-coresight-devices-trbe | 6 ++ .../bindings/arm/arm,coresight-cti.yaml | 4 ++ .../arm/arm,coresight-dummy-sink.yaml | 4 ++ .../arm/arm,coresight-dummy-source.yaml | 4 ++ .../arm/arm,coresight-dynamic-funnel.yaml | 4 ++ .../arm/arm,coresight-dynamic-replicator.yaml | 4 ++ .../bindings/arm/arm,coresight-etb10.yaml | 4 ++ .../bindings/arm/arm,coresight-etm.yaml | 4 ++ .../arm/arm,coresight-static-funnel.yaml | 4 ++ .../arm/arm,coresight-static-replicator.yaml | 4 ++ .../bindings/arm/arm,coresight-tmc.yaml | 4 ++ .../bindings/arm/arm,coresight-tpiu.yaml | 4 ++ .../bindings/arm/qcom,coresight-ctcu.yaml | 4 ++ .../arm/qcom,coresight-remote-etm.yaml | 4 ++ .../bindings/arm/qcom,coresight-tpda.yaml | 4 ++ .../bindings/arm/qcom,coresight-tpdm.yaml | 4 ++ drivers/hwtracing/coresight/coresight-sysfs.c | 71 ++++++++++++++++++- 26 files changed, 189 insertions(+), 2 deletions(-) -- 2.25.1

5 days, 8 hours

[PATCH v8 0/2] coresight: Add label sysfs node support

by Mao Jinlong

Change since V7: 1. Update the conflict when apply to coresight next. 2. Update the Date and version in ABI file. V7 link: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20250226121926.… Change since V6: 1. Update the date and verison in ABI file. Change since V5: 1. Update the kernel version of ABI files. 2. Add link of different patch versions. V5 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20241210122253.319… Change since V4: 1. Add label in DT and add label sysfs node for each coresight device. V4 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20240703122340.268… Change since V3: 1. Change device-name to arm,cs-dev-name. 2. Add arm,cs-dev-name to only CTI and sources' dt-binding. V3 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20240131082628.628… Change since V2: 1. Fix the error in coresight core. drivers/hwtracing/coresight/coresight-core.c:1775:7: error: assigning to 'char *' from 'const char *' discards qualifiers 2. Fix the warning when run dtbinding check. Documentation/devicetree/bindings/arm/arm,coresight-cpu-debug.yaml: device-name: missing type definition V2 link: https://patchwork.kernel.org/project/linux-arm-msm/cover/20240115164252.265… Change since V1: 1. Change coresight-name to device name. 2. Add the device-name in coresight dt bindings. V1 link: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20230208110716.… Mao Jinlong (2): dt-bindings: arm: Add label in the coresight components coresight: Add label sysfs node support .../testing/sysfs-bus-coresight-devices-cti | 6 ++++ .../sysfs-bus-coresight-devices-funnel | 6 ++++ .../testing/sysfs-bus-coresight-devices-tpdm | 6 ++++ .../bindings/arm/arm,coresight-cti.yaml | 6 ++++ .../arm/arm,coresight-dummy-sink.yaml | 6 ++++ .../arm/arm,coresight-dummy-source.yaml | 6 ++++ .../arm/arm,coresight-dynamic-funnel.yaml | 6 ++++ .../arm/arm,coresight-dynamic-replicator.yaml | 6 ++++ .../arm/arm,coresight-static-funnel.yaml | 6 ++++ .../arm/arm,coresight-static-replicator.yaml | 6 ++++ .../bindings/arm/arm,coresight-tmc.yaml | 6 ++++ .../bindings/arm/qcom,coresight-tpda.yaml | 6 ++++ .../bindings/arm/qcom,coresight-tpdm.yaml | 6 ++++ drivers/hwtracing/coresight/coresight-sysfs.c | 32 +++++++++++++++++++ 14 files changed, 110 insertions(+) -- 2.17.1

5 days, 18 hours

Re: [PATCH v3 RESEND 01/10] coresight: core: Refactoring ctcu_get_active_port and make it generic

by Mike Leach

Hi, On Mon, 14 Jul 2025 at 07:31, Jie Gan <jie.gan(a)oss.qualcomm.com> wrote: > > Remove ctcu_get_active_port from CTCU module and add it to the core > framework. > > The port number is crucial for the CTCU device to identify which ETR > it serves. With the port number we can correctly get required parameters > of the CTCU device in TMC module. > > Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > --- > drivers/hwtracing/coresight/coresight-core.c | 24 +++++++++++++++++++ > .../hwtracing/coresight/coresight-ctcu-core.c | 19 +-------------- > drivers/hwtracing/coresight/coresight-priv.h | 2 ++ > 3 files changed, 27 insertions(+), 18 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c > index 1accd7cbd54b..5297a5ff7921 100644 > --- a/drivers/hwtracing/coresight/coresight-core.c > +++ b/drivers/hwtracing/coresight/coresight-core.c > @@ -580,6 +580,30 @@ struct coresight_device *coresight_get_sink(struct coresight_path *path) > } > EXPORT_SYMBOL_GPL(coresight_get_sink); > > +/** > + * coresight_get_port_helper: get the in-port number of the helper device > + * that is connected to the csdev. > + * As written this looks at all connections, not just those that are helpers. That is fine, so perhaps rename as such. e.g. coresight_get_in_port_dest and name the input parameters src , dest respectively. > + * @csdev: csdev of the device that is connected to helper. > + * @helper: csdev of the helper device. > + * > + * Return: port number upson success or -EINVAL for fail. sp: upon/upson > + */ > +int coresight_get_port_helper(struct coresight_device *csdev, > + struct coresight_device *helper) > +{ > + struct coresight_platform_data *pdata = helper->pdata; > + int i; > + > + for (i = 0; i < pdata->nr_inconns; ++i) { > + if (pdata->in_conns[i]->src_dev == csdev) > + return pdata->in_conns[i]->dest_port; > + } > + > + return -EINVAL; > +} > +EXPORT_SYMBOL_GPL(coresight_get_port_helper); > + > u32 coresight_get_sink_id(struct coresight_device *csdev) > { > if (!csdev->ea) > diff --git a/drivers/hwtracing/coresight/coresight-ctcu-core.c b/drivers/hwtracing/coresight/coresight-ctcu-core.c > index c6bafc96db96..28ea4a216345 100644 > --- a/drivers/hwtracing/coresight/coresight-ctcu-core.c > +++ b/drivers/hwtracing/coresight/coresight-ctcu-core.c > @@ -118,23 +118,6 @@ static int __ctcu_set_etr_traceid(struct coresight_device *csdev, u8 traceid, in > return 0; > } > > -/* > - * Searching the sink device from helper's view in case there are multiple helper devices > - * connected to the sink device. > - */ > -static int ctcu_get_active_port(struct coresight_device *sink, struct coresight_device *helper) > -{ > - struct coresight_platform_data *pdata = helper->pdata; > - int i; > - > - for (i = 0; i < pdata->nr_inconns; ++i) { > - if (pdata->in_conns[i]->src_dev == sink) > - return pdata->in_conns[i]->dest_port; > - } > - > - return -EINVAL; > -} > - > static int ctcu_set_etr_traceid(struct coresight_device *csdev, struct coresight_path *path, > bool enable) > { > @@ -147,7 +130,7 @@ static int ctcu_set_etr_traceid(struct coresight_device *csdev, struct coresight > return -EINVAL; > } > > - port_num = ctcu_get_active_port(sink, csdev); > + port_num = coresight_get_port_helper(sink, csdev); > if (port_num < 0) > return -EINVAL; > > diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h > index 33e22b1ba043..07a5f03de81d 100644 > --- a/drivers/hwtracing/coresight/coresight-priv.h > +++ b/drivers/hwtracing/coresight/coresight-priv.h > @@ -156,6 +156,8 @@ void coresight_remove_links(struct coresight_device *orig, > u32 coresight_get_sink_id(struct coresight_device *csdev); > void coresight_path_assign_trace_id(struct coresight_path *path, > enum cs_mode mode); > +int coresight_get_port_helper(struct coresight_device *csdev, > + struct coresight_device *helper); > rename here too > #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM3X) > int etm_readl_cp14(u32 off, unsigned int *val); > -- > 2.34.1 > regards Mike -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

6 days, 11 hours

Re: [PATCH v3] coresight: Replace scnprintf() with sysfs_emit() in sysfs show functions

by Mike Leach

Hi, If this change is to be made, which is a high degree of churn for no functional difference, then it should be comprehensive. The sysfs _show() functions in coresight_ /cti_sysfs.c / tmc_core.c / trbe.c / funnel.c, which all use sprintf in the show() function should be included On Wed, 9 Jul 2025 at 18:17, Chelsy Ratnawat <chelsyratnawat2001(a)gmail.com> wrote: > > Documentation/filesystems/sysfs.rst mentions that show() should only > use sysfs_emit() or sysfs_emit_at() when formating the value to be > returned to user space. So replace scnprintf() with sysfs_emit(). > > Signed-off-by: Chelsy Ratnawat <chelsyratnawat2001(a)gmail.com> > Reviewed-by: James Clark <james.clark(a)linaro.org> > --- > Changes in v3: > - fixed warnings from checkpatch.pl > > .../hwtracing/coresight/coresight-etm-perf.c | 4 +- > .../coresight/coresight-etm3x-sysfs.c | 2 +- > .../coresight/coresight-etm4x-sysfs.c | 118 +++++++++--------- > drivers/hwtracing/coresight/coresight-stm.c | 8 +- > drivers/hwtracing/coresight/coresight-sysfs.c | 4 +- > 5 files changed, 68 insertions(+), 68 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c > index f1551c08ecb2..8cfdcbc2f8f6 100644 > --- a/drivers/hwtracing/coresight/coresight-etm-perf.c > +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c > @@ -851,7 +851,7 @@ static ssize_t etm_perf_sink_name_show(struct device *dev, > struct dev_ext_attribute *ea; > > ea = container_of(dattr, struct dev_ext_attribute, attr); > - return scnprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)(ea->var)); > + return sysfs_emit(buf, "0x%lx\n", (unsigned long)(ea->var)); > } > > static struct dev_ext_attribute * > @@ -943,7 +943,7 @@ static ssize_t etm_perf_cscfg_event_show(struct device *dev, > struct dev_ext_attribute *ea; > > ea = container_of(dattr, struct dev_ext_attribute, attr); > - return scnprintf(buf, PAGE_SIZE, "configid=0x%lx\n", (unsigned long)(ea->var)); > + return sysfs_emit(buf, "configid=0x%lx\n", (unsigned long)(ea->var)); > } > > int etm_perf_add_symlink_cscfg(struct device *dev, struct cscfg_config_desc *config_desc) > diff --git a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c > index 762109307b86..4868eb05a312 100644 > --- a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c > +++ b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c > @@ -1182,7 +1182,7 @@ static ssize_t cpu_show(struct device *dev, > struct etm_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->cpu; > - return scnprintf(buf, PAGE_SIZE, "%d\n", val); > + return sysfs_emit(buf, "%d\n", val); > > } > static DEVICE_ATTR_RO(cpu); > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > index ab251865b893..4ddc0d344b61 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > @@ -63,7 +63,7 @@ static ssize_t nr_pe_cmp_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->nr_pe_cmp; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(nr_pe_cmp); > > @@ -75,7 +75,7 @@ static ssize_t nr_addr_cmp_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->nr_addr_cmp; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(nr_addr_cmp); > > @@ -87,7 +87,7 @@ static ssize_t nr_cntr_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->nr_cntr; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(nr_cntr); > > @@ -99,7 +99,7 @@ static ssize_t nr_ext_inp_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->nr_ext_inp; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(nr_ext_inp); > > @@ -111,7 +111,7 @@ static ssize_t numcidc_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->numcidc; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(numcidc); > > @@ -123,7 +123,7 @@ static ssize_t numvmidc_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->numvmidc; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(numvmidc); > > @@ -135,7 +135,7 @@ static ssize_t nrseqstate_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->nrseqstate; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(nrseqstate); > > @@ -147,7 +147,7 @@ static ssize_t nr_resource_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->nr_resource; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(nr_resource); > > @@ -159,7 +159,7 @@ static ssize_t nr_ss_cmp_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->nr_ss_cmp; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(nr_ss_cmp); > > @@ -287,7 +287,7 @@ static ssize_t mode_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->mode; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t mode_store(struct device *dev, > @@ -453,7 +453,7 @@ static ssize_t pe_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->pe_sel; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t pe_store(struct device *dev, > @@ -488,7 +488,7 @@ static ssize_t event_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->eventctrl0; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t event_store(struct device *dev, > @@ -537,7 +537,7 @@ static ssize_t event_instren_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = FIELD_GET(TRCEVENTCTL1R_INSTEN_MASK, config->eventctrl1); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t event_instren_store(struct device *dev, > @@ -593,7 +593,7 @@ static ssize_t event_ts_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->ts_ctrl; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t event_ts_store(struct device *dev, > @@ -623,7 +623,7 @@ static ssize_t syncfreq_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->syncfreq; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t syncfreq_store(struct device *dev, > @@ -653,7 +653,7 @@ static ssize_t cyc_threshold_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->ccctlr; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t cyc_threshold_store(struct device *dev, > @@ -686,7 +686,7 @@ static ssize_t bb_ctrl_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->bb_ctrl; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t bb_ctrl_store(struct device *dev, > @@ -726,7 +726,7 @@ static ssize_t event_vinst_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = FIELD_GET(TRCVICTLR_EVENT_MASK, config->vinst_ctrl); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t event_vinst_store(struct device *dev, > @@ -758,7 +758,7 @@ static ssize_t s_exlevel_vinst_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = FIELD_GET(TRCVICTLR_EXLEVEL_S_MASK, config->vinst_ctrl); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t s_exlevel_vinst_store(struct device *dev, > @@ -793,7 +793,7 @@ static ssize_t ns_exlevel_vinst_show(struct device *dev, > > /* EXLEVEL_NS, bits[23:20] */ > val = FIELD_GET(TRCVICTLR_EXLEVEL_NS_MASK, config->vinst_ctrl); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t ns_exlevel_vinst_store(struct device *dev, > @@ -827,7 +827,7 @@ static ssize_t addr_idx_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->addr_idx; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t addr_idx_store(struct device *dev, > @@ -866,11 +866,11 @@ static ssize_t addr_instdatatype_show(struct device *dev, > raw_spin_lock(&drvdata->spinlock); > idx = config->addr_idx; > val = FIELD_GET(TRCACATRn_TYPE_MASK, config->addr_acc[idx]); > - len = scnprintf(buf, PAGE_SIZE, "%s\n", > - val == TRCACATRn_TYPE_ADDR ? "instr" : > - (val == TRCACATRn_TYPE_DATA_LOAD_ADDR ? "data_load" : > - (val == TRCACATRn_TYPE_DATA_STORE_ADDR ? "data_store" : > - "data_load_store"))); > + len = sysfs_emit(buf, "%s\n", > + val == TRCACATRn_TYPE_ADDR ? "instr" : > + (val == TRCACATRn_TYPE_DATA_LOAD_ADDR ? "data_load" : > + (val == TRCACATRn_TYPE_DATA_STORE_ADDR ? "data_store" : > + "data_load_store"))); > raw_spin_unlock(&drvdata->spinlock); > return len; > } > @@ -918,7 +918,7 @@ static ssize_t addr_single_show(struct device *dev, > } > val = (unsigned long)config->addr_val[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t addr_single_store(struct device *dev, > @@ -974,7 +974,7 @@ static ssize_t addr_range_show(struct device *dev, > val1 = (unsigned long)config->addr_val[idx]; > val2 = (unsigned long)config->addr_val[idx + 1]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx %#lx\n", val1, val2); > + return sysfs_emit(buf, "%#lx %#lx\n", val1, val2); > } > > static ssize_t addr_range_store(struct device *dev, > @@ -1049,7 +1049,7 @@ static ssize_t addr_start_show(struct device *dev, > > val = (unsigned long)config->addr_val[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t addr_start_store(struct device *dev, > @@ -1104,7 +1104,7 @@ static ssize_t addr_stop_show(struct device *dev, > > val = (unsigned long)config->addr_val[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t addr_stop_store(struct device *dev, > @@ -1152,7 +1152,7 @@ static ssize_t addr_ctxtype_show(struct device *dev, > idx = config->addr_idx; > /* CONTEXTTYPE, bits[3:2] */ > val = FIELD_GET(TRCACATRn_CONTEXTTYPE_MASK, config->addr_acc[idx]); > - len = scnprintf(buf, PAGE_SIZE, "%s\n", val == ETM_CTX_NONE ? "none" : > + len = sysfs_emit(buf, "%s\n", val == ETM_CTX_NONE ? "none" : > (val == ETM_CTX_CTXID ? "ctxid" : > (val == ETM_CTX_VMID ? "vmid" : "all"))); > raw_spin_unlock(&drvdata->spinlock); > @@ -1219,7 +1219,7 @@ static ssize_t addr_context_show(struct device *dev, > /* context ID comparator bits[6:4] */ > val = FIELD_GET(TRCACATRn_CONTEXT_MASK, config->addr_acc[idx]); > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t addr_context_store(struct device *dev, > @@ -1262,7 +1262,7 @@ static ssize_t addr_exlevel_s_ns_show(struct device *dev, > idx = config->addr_idx; > val = FIELD_GET(TRCACATRn_EXLEVEL_MASK, config->addr_acc[idx]); > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t addr_exlevel_s_ns_store(struct device *dev, > @@ -1325,8 +1325,8 @@ static ssize_t addr_cmp_view_show(struct device *dev, > } > raw_spin_unlock(&drvdata->spinlock); > if (addr_type) { > - size = scnprintf(buf, PAGE_SIZE, "addr_cmp[%i] %s %#lx", idx, > - addr_type_names[addr_type], addr_v); > + size = sysfs_emit(buf, "addr_cmp[%i] %s %#lx", idx, > + addr_type_names[addr_type], addr_v); > if (addr_type == ETM_ADDR_TYPE_RANGE) { > size += scnprintf(buf + size, PAGE_SIZE - size, > " %#lx %s", addr_v2, > @@ -1335,7 +1335,7 @@ static ssize_t addr_cmp_view_show(struct device *dev, > size += scnprintf(buf + size, PAGE_SIZE - size, > " ctrl(%#lx)\n", addr_ctrl); > } else { > - size = scnprintf(buf, PAGE_SIZE, "addr_cmp[%i] unused\n", idx); > + size = sysfs_emit(buf, "addr_cmp[%i] unused\n", idx); > } > return size; > } > @@ -1352,7 +1352,7 @@ static ssize_t vinst_pe_cmp_start_stop_show(struct device *dev, > if (!drvdata->nr_pe_cmp) > return -EINVAL; > val = config->vipcssctlr; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static ssize_t vinst_pe_cmp_start_stop_store(struct device *dev, > struct device_attribute *attr, > @@ -1383,7 +1383,7 @@ static ssize_t seq_idx_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->seq_idx; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t seq_idx_store(struct device *dev, > @@ -1419,7 +1419,7 @@ static ssize_t seq_state_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->seq_state; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t seq_state_store(struct device *dev, > @@ -1453,7 +1453,7 @@ static ssize_t seq_event_show(struct device *dev, > idx = config->seq_idx; > val = config->seq_ctrl[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t seq_event_store(struct device *dev, > @@ -1486,7 +1486,7 @@ static ssize_t seq_reset_event_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->seq_rst; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t seq_reset_event_store(struct device *dev, > @@ -1516,7 +1516,7 @@ static ssize_t cntr_idx_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->cntr_idx; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t cntr_idx_store(struct device *dev, > @@ -1556,7 +1556,7 @@ static ssize_t cntrldvr_show(struct device *dev, > idx = config->cntr_idx; > val = config->cntrldvr[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t cntrldvr_store(struct device *dev, > @@ -1594,7 +1594,7 @@ static ssize_t cntr_val_show(struct device *dev, > idx = config->cntr_idx; > val = config->cntr_val[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t cntr_val_store(struct device *dev, > @@ -1632,7 +1632,7 @@ static ssize_t cntr_ctrl_show(struct device *dev, > idx = config->cntr_idx; > val = config->cntr_ctrl[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t cntr_ctrl_store(struct device *dev, > @@ -1664,7 +1664,7 @@ static ssize_t res_idx_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->res_idx; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t res_idx_store(struct device *dev, > @@ -1708,7 +1708,7 @@ static ssize_t res_ctrl_show(struct device *dev, > idx = config->res_idx; > val = config->res_ctrl[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t res_ctrl_store(struct device *dev, > @@ -1746,7 +1746,7 @@ static ssize_t sshot_idx_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->ss_idx; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t sshot_idx_store(struct device *dev, > @@ -1780,7 +1780,7 @@ static ssize_t sshot_ctrl_show(struct device *dev, > raw_spin_lock(&drvdata->spinlock); > val = config->ss_ctrl[config->ss_idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t sshot_ctrl_store(struct device *dev, > @@ -1815,7 +1815,7 @@ static ssize_t sshot_status_show(struct device *dev, > raw_spin_lock(&drvdata->spinlock); > val = config->ss_status[config->ss_idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > static DEVICE_ATTR_RO(sshot_status); > > @@ -1830,7 +1830,7 @@ static ssize_t sshot_pe_ctrl_show(struct device *dev, > raw_spin_lock(&drvdata->spinlock); > val = config->ss_pe_cmp[config->ss_idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t sshot_pe_ctrl_store(struct device *dev, > @@ -1864,7 +1864,7 @@ static ssize_t ctxid_idx_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->ctxid_idx; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t ctxid_idx_store(struct device *dev, > @@ -1911,7 +1911,7 @@ static ssize_t ctxid_pid_show(struct device *dev, > idx = config->ctxid_idx; > val = (unsigned long)config->ctxid_pid[idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t ctxid_pid_store(struct device *dev, > @@ -1972,7 +1972,7 @@ static ssize_t ctxid_masks_show(struct device *dev, > val1 = config->ctxid_mask0; > val2 = config->ctxid_mask1; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx %#lx\n", val1, val2); > + return sysfs_emit(buf, "%#lx %#lx\n", val1, val2); > } > > static ssize_t ctxid_masks_store(struct device *dev, > @@ -2090,7 +2090,7 @@ static ssize_t vmid_idx_show(struct device *dev, > struct etmv4_config *config = &drvdata->config; > > val = config->vmid_idx; > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t vmid_idx_store(struct device *dev, > @@ -2135,7 +2135,7 @@ static ssize_t vmid_val_show(struct device *dev, > raw_spin_lock(&drvdata->spinlock); > val = (unsigned long)config->vmid_val[config->vmid_idx]; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t vmid_val_store(struct device *dev, > @@ -2187,7 +2187,7 @@ static ssize_t vmid_masks_show(struct device *dev, > val1 = config->vmid_mask0; > val2 = config->vmid_mask1; > raw_spin_unlock(&drvdata->spinlock); > - return scnprintf(buf, PAGE_SIZE, "%#lx %#lx\n", val1, val2); > + return sysfs_emit(buf, "%#lx %#lx\n", val1, val2); > } > > static ssize_t vmid_masks_store(struct device *dev, > @@ -2303,7 +2303,7 @@ static ssize_t cpu_show(struct device *dev, > struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); > > val = drvdata->cpu; > - return scnprintf(buf, PAGE_SIZE, "%d\n", val); > + return sysfs_emit(buf, "%d\n", val); > > } > static DEVICE_ATTR_RO(cpu); > @@ -2461,7 +2461,7 @@ static ssize_t coresight_etm4x_reg_show(struct device *dev, > val = etmv4_cross_read(drvdata, offset); > pm_runtime_put_sync(dev->parent); > > - return scnprintf(buf, PAGE_SIZE, "0x%x\n", val); > + return sysfs_emit(buf, "0x%x\n", val); > } > > static bool > diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c > index e45c6c7204b4..fa09a43889d7 100644 > --- a/drivers/hwtracing/coresight/coresight-stm.c > +++ b/drivers/hwtracing/coresight/coresight-stm.c > @@ -470,7 +470,7 @@ static ssize_t hwevent_enable_show(struct device *dev, > struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); > unsigned long val = drvdata->stmheer; > > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t hwevent_enable_store(struct device *dev, > @@ -499,7 +499,7 @@ static ssize_t hwevent_select_show(struct device *dev, > struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); > unsigned long val = drvdata->stmhebsr; > > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t hwevent_select_store(struct device *dev, > @@ -534,7 +534,7 @@ static ssize_t port_select_show(struct device *dev, > spin_unlock(&drvdata->spinlock); > } > > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t port_select_store(struct device *dev, > @@ -581,7 +581,7 @@ static ssize_t port_enable_show(struct device *dev, > spin_unlock(&drvdata->spinlock); > } > > - return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); > + return sysfs_emit(buf, "%#lx\n", val); > } > > static ssize_t port_enable_store(struct device *dev, > diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/hwtracing/coresight/coresight-sysfs.c > index feadaf065b53..547f4970e1e5 100644 > --- a/drivers/hwtracing/coresight/coresight-sysfs.c > +++ b/drivers/hwtracing/coresight/coresight-sysfs.c > @@ -315,7 +315,7 @@ static ssize_t enable_sink_show(struct device *dev, > { > struct coresight_device *csdev = to_coresight_device(dev); > > - return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->sysfs_sink_activated); > + return sysfs_emit(buf, "%u\n", csdev->sysfs_sink_activated); > } > > static ssize_t enable_sink_store(struct device *dev, > @@ -343,7 +343,7 @@ static ssize_t enable_source_show(struct device *dev, > struct coresight_device *csdev = to_coresight_device(dev); > > guard(mutex)(&coresight_mutex); > - return scnprintf(buf, PAGE_SIZE, "%u\n", > + return sysfs_emit(buf, "%u\n", > coresight_get_mode(csdev) == CS_MODE_SYSFS); > } > > -- > 2.47.1 > Regards Mike -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

1 week

[PATCH v2 00/28] CoreSight: Address CPU Power Management Issues

by Leo Yan

This series addresses CPU power management issues in the CoreSight drivers. For easier review, the patches are organized into two categories: o Patches 01 ~ 10 focus on CPU power management within the ETM drivers. These patches fix SMP-safe access to the mode, correct context synchronization, and refactor the CPU suspend/resume flows. o Patches 11 ~ 28 extend CPU power management to cover activated paths, including helpers, links, and sinks. These changes move CPU PM and hotplug notifiers from the ETMv4 driver into the CoreSight core layer. Summary of Changes: - Patches 01 ~ 03: Fix device mode access in the SMP mode. - Patch 04 : A minor fix for polling bit. - Patches 05 ~ 07: Improve the context synchronization based on the ETM specification (IHI0064H.b) and Arm ARM (ARM DDI 0487 L.a). - Patches 08 ~ 10: Refactor the context save/restore flow in the ETMv4 driver, in the end, the CPU PM callbacks reuse the normal enabling and disabling flows. - Patches 11 ~ 17: Move CPU PM code from ETMv4 driver to the core layer. - Patches 18 ~ 25: Enhance device mode handling in the CTI driver, distinguishes debug mode from trace modes (Perf or SysFS mode). Extend support activated paths during CPU idle. Support save and restore context for per-CPU sink (TRBE). - Patches 26 ~ 28: Move CPU hotplug notifier from the ETMv4 driver to the core layer. The full path is now managed in CPU hotplug. Verification: This series has been verified on the following platforms: - Hikey960, Juno-r0 and Juno-r2: Note that the firmware on Hikey960 and Juno-r0 is unstable. While no CoreSight failures were observed, but the CPU hotplug or CPU idle itself may fail intermittently. Juno-r2 is much stable and can pass 24+ hours stress test. - FVP RevC: Verified TRBE changes. Stress test script: #!/usr/bin/bash echo 1 > /sys/bus/coresight/devices/tmc_etr0/enable_sink while true; do echo 0 > /sys/devices/system/cpu/cpu2/online; echo 1 > /sys/devices/system/cpu/cpu2/online; done & while true; do echo 1 > /sys/bus/coresight/devices/etm2/enable_source; echo 0 > /sys/bus/coresight/devices/etm2/enable_source; done & --- Changes in v2: - Refactored ETMv4 suspend and resume for reusing the normal enabling and disabling flows (James). - Used a per-CPU structure to maintain path pointers (James). - Supported helpers in CPU PM flows (James). - Fixed the SMP-safe access to device mode. - Fixed the context synchronization in ETMv4x driver. - Link to v1: https://lore.kernel.org/linux-arm-kernel/20250516160742.1200904-1-leo.yan@a… Signed-off-by: Leo Yan <leo.yan(a)arm.com> --- Leo Yan (27): coresight: Change device mode to atomic type coresight: etm4x: Always set tracer's device mode on target CPU coresight: etm3x: Always set tracer's device mode on target CPU coresight: etm4x: Correct polling IDLE bit coresight: etm4x: Ensure context synchronization is not ignored coresight: etm4x: Add context synchronization before enabling trace coresight: etm4x: Properly control filter in CPU idle with FEAT_TRF coresight: etm4x: Remove the state_needs_restore flag coresight: etm4x: Add flag to control single-shot restart coresight: etm4x: Reuse normal enable and disable logic in CPU idle coresight: Populate CPU ID into the coresight_device structure coresight: sysfs: Validate CPU online status for per-CPU sources coresight: Set per CPU source pointer coresight: Register CPU PM notifier in core layer coresight: etm4x: Hook CPU PM callbacks coresight: Add callback to determine if context save/restore is needed coresight: etm4x: Remove redundant condition checks in save and restore coresight: cti: Fix race condition by using device mode coresight: cti: Introduce CS_MODE_DEBUG mode coresight: cti: Properly handle modes in CPU PM notifiers coresight: Add per-CPU path pointer coresight: Add 'in_idle' argument to path enable/disable functions coresight: Control path during CPU idle coresight: Add PM callbacks for percpu sink coresight: Take hotplug lock in enable_source_store() for Sysfs mode coresight: Move CPU hotplug callbacks to core layer coresight: Manage activated path during CPU hotplug Yabin Cui (1): coresight: trbe: Save and restore state across CPU low power state drivers/hwtracing/coresight/coresight-catu.c | 1 + drivers/hwtracing/coresight/coresight-core.c | 337 ++++++++++++-- drivers/hwtracing/coresight/coresight-ctcu-core.c | 1 + drivers/hwtracing/coresight/coresight-cti-core.c | 40 +- drivers/hwtracing/coresight/coresight-cti-sysfs.c | 2 +- drivers/hwtracing/coresight/coresight-dummy.c | 1 + drivers/hwtracing/coresight/coresight-etb10.c | 1 + drivers/hwtracing/coresight/coresight-etm3x-core.c | 61 ++- drivers/hwtracing/coresight/coresight-etm4x-core.c | 488 ++++++--------------- drivers/hwtracing/coresight/coresight-etm4x.h | 62 --- drivers/hwtracing/coresight/coresight-funnel.c | 1 + drivers/hwtracing/coresight/coresight-replicator.c | 1 + drivers/hwtracing/coresight/coresight-stm.c | 1 + drivers/hwtracing/coresight/coresight-sysfs.c | 10 + drivers/hwtracing/coresight/coresight-tmc-core.c | 1 + drivers/hwtracing/coresight/coresight-tpda.c | 1 + drivers/hwtracing/coresight/coresight-tpdm.c | 1 + drivers/hwtracing/coresight/coresight-tpiu.c | 1 + drivers/hwtracing/coresight/coresight-trbe.c | 85 ++++ drivers/hwtracing/coresight/ultrasoc-smb.c | 1 + include/linux/coresight.h | 55 ++- 21 files changed, 665 insertions(+), 487 deletions(-) --- base-commit: 66701750d5565c574af42bef0b789ce0203e3071 change-id: 20250611-arm_cs_pm_fix_v3-f4ae29bb7d81 Best regards, -- Leo Yan <leo.yan(a)arm.com>

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CoreSight July 2025