CoreSight

coresight@lists.linaro.org

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2448 discussions

[GIT PULL] coresight: hwtracing: subsystem updates for v6.6

by Suzuki K Poulose

The following changes since commit 6eaae198076080886b9e7d57f4ae06fa782f90ef: Linux 6.5-rc3 (2023-07-23 15:24:10 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git tags/coresight-next-v6.6 for you to fetch changes up to c0a232f1e19e378c5c4e5973a996392942c80090: coresight: trbe: Fix TRBE potential sleep in atomic context (2023-08-18 16:42:26 +0100) ---------------------------------------------------------------- coresigh: Updates for v6.6 Coresight and hwtracing subsystem updates for Linux v6.6 includes: - ACPI support for CoreSight ETMv4x via system instructions and Arm ETE (v9.x). - Fix potential sleeping in atomic context for TRBE driver - Fix memory leak in ACPI platform parsing code - Fix all warnings with W=1 - Fix warning with double free attempt for TRBE platform data - Miscellaneous cleanups and fixes Signed-off-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> ---------------------------------------------------------------- Anshuman Khandual (6): coresight: etm4x: Allocate and device assign 'struct etmv4_drvdata' earlier coresight: etm4x: Drop iomem 'base' argument from etm4_probe() coresight: etm4x: Drop pid argument from etm4_probe() coresight: etm4x: Change etm4_platform_driver driver for MMIO devices coresight: trbe: Directly use ID_AA64DFR0_EL1_TraceBuffer_IMP coresight: etm4x: Ensure valid drvdata and clock before clk_put() James Clark (1): coresight: Fix all W=1 build warnings Junhao He (2): coresight: Fix memory leak in acpi_buffer->pointer coresight: trbe: Fix TRBE potential sleep in atomic context Rob Herring (1): hwtracing: coresight: Explicitly include correct DT includes Ruidong Tian (1): coresight: tmc: Explicit type conversions to prevent integer overflow Suzuki K Poulose (3): coresight: platform: acpi: Ignore the absence of graph coresight: etm4x: Add ACPI support in platform driver coresight: trbe: Allocate platform data per device Xiongfeng Wang (1): hwtracing: hisi_ptt: Use pci_dev_id() to simplify the code Yang Yingliang (1): coresight: dummy: simplify the code with module_platform_driver drivers/acpi/acpi_amba.c | 1 - drivers/hwtracing/coresight/coresight-core.c | 2 +- drivers/hwtracing/coresight/coresight-cti-core.c | 2 +- drivers/hwtracing/coresight/coresight-dummy.c | 12 +-- drivers/hwtracing/coresight/coresight-etm4x-cfg.c | 4 +- drivers/hwtracing/coresight/coresight-etm4x-core.c | 118 +++++++++++++++++---- drivers/hwtracing/coresight/coresight-etm4x.h | 4 + drivers/hwtracing/coresight/coresight-platform.c | 46 +++++--- drivers/hwtracing/coresight/coresight-tmc-etf.c | 2 +- drivers/hwtracing/coresight/coresight-tmc-etr.c | 5 +- drivers/hwtracing/coresight/coresight-tmc.h | 2 +- drivers/hwtracing/coresight/coresight-trbe.c | 43 ++++---- drivers/hwtracing/coresight/coresight-trbe.h | 2 +- drivers/hwtracing/ptt/hisi_ptt.c | 8 +- include/linux/coresight.h | 59 +++++++++++ 15 files changed, 225 insertions(+), 85 deletions(-)

2 years

[PATCH V3] coresight: trbe: Fix TRBE potential sleep in atomic context

by Junhao He

smp_call_function_single() will allocate an IPI interrupt vector to the target processor and send a function call request to the interrupt vector. After the target processor receives the IPI interrupt, it will execute arm_trbe_remove_coresight_cpu() call request in the interrupt handler. According to the device_unregister() stack information, if other process is useing the device, the down_write() may sleep, and trigger deadlocks or unexpected errors. arm_trbe_remove_coresight_cpu coresight_unregister device_unregister device_del kobject_del __kobject_del sysfs_remove_dir kernfs_remove down_write ---------> it may sleep Add a helper arm_trbe_disable_cpu() to disable TRBE precpu irq and reset per TRBE. Simply call arm_trbe_remove_coresight_cpu() directly without useing the smp_call_function_single(), which is the same as registering the TRBE coresight device. Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver") Signed-off-by: Junhao He <hejunhao3(a)huawei.com> Link: https://lore.kernel.org/r/20230814093813.19152-2-hejunhao3@huawei.com [ Remove duplicate cpumask checks during removal ] Signed-off-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> [ v3 - Remove the operation of assigning NULL to cpudata->drvdata ] --- drivers/hwtracing/coresight/coresight-trbe.c | 32 +++++++++++--------- 1 file changed, 17 insertions(+), 15 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c index 8e4eb37e66e8..e20c1c6acc73 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.c +++ b/drivers/hwtracing/coresight/coresight-trbe.c @@ -1225,6 +1225,16 @@ static void arm_trbe_enable_cpu(void *info) enable_percpu_irq(drvdata->irq, IRQ_TYPE_NONE); } +static void arm_trbe_disable_cpu(void *info) +{ + struct trbe_drvdata *drvdata = info; + struct trbe_cpudata *cpudata = this_cpu_ptr(drvdata->cpudata); + + disable_percpu_irq(drvdata->irq); + trbe_reset_local(cpudata); +} + + static void arm_trbe_register_coresight_cpu(struct trbe_drvdata *drvdata, int cpu) { struct trbe_cpudata *cpudata = per_cpu_ptr(drvdata->cpudata, cpu); @@ -1329,18 +1339,12 @@ static void arm_trbe_probe_cpu(void *info) cpumask_clear_cpu(cpu, &drvdata->supported_cpus); } -static void arm_trbe_remove_coresight_cpu(void *info) +static void arm_trbe_remove_coresight_cpu(struct trbe_drvdata *drvdata, int cpu) { - int cpu = smp_processor_id(); - struct trbe_drvdata *drvdata = info; - struct trbe_cpudata *cpudata = per_cpu_ptr(drvdata->cpudata, cpu); struct coresight_device *trbe_csdev = coresight_get_percpu_sink(cpu); - disable_percpu_irq(drvdata->irq); - trbe_reset_local(cpudata); if (trbe_csdev) { coresight_unregister(trbe_csdev); - cpudata->drvdata = NULL; coresight_set_percpu_sink(cpu, NULL); } } @@ -1369,8 +1373,10 @@ static int arm_trbe_remove_coresight(struct trbe_drvdata *drvdata) { int cpu; - for_each_cpu(cpu, &drvdata->supported_cpus) - smp_call_function_single(cpu, arm_trbe_remove_coresight_cpu, drvdata, 1); + for_each_cpu(cpu, &drvdata->supported_cpus) { + smp_call_function_single(cpu, arm_trbe_disable_cpu, drvdata, 1); + arm_trbe_remove_coresight_cpu(drvdata, cpu); + } free_percpu(drvdata->cpudata); return 0; } @@ -1409,12 +1415,8 @@ static int arm_trbe_cpu_teardown(unsigned int cpu, struct hlist_node *node) { struct trbe_drvdata *drvdata = hlist_entry_safe(node, struct trbe_drvdata, hotplug_node); - if (cpumask_test_cpu(cpu, &drvdata->supported_cpus)) { - struct trbe_cpudata *cpudata = per_cpu_ptr(drvdata->cpudata, cpu); - - disable_percpu_irq(drvdata->irq); - trbe_reset_local(cpudata); - } + if (cpumask_test_cpu(cpu, &drvdata->supported_cpus)) + arm_trbe_disable_cpu(drvdata); return 0; } -- 2.33.0

2 years

[PATCH 0/2] Fix memory leak in coresight drivers

by Junhao He

When build kernel with CONFIG_KASAN=y there are reports of memory leaks, like: ... unreferenced object 0xffff2020510fe200 (size 64): comm "insmod", pid 4642, jiffies 4295983961 (age 46049.752s) hex dump (first 32 bytes): 10 20 40 06 28 20 ff ff 10 40 7f 06 20 20 ff ff . @.( ...@.. .. 10 20 bb 8a 20 00 ff ff 10 e0 c7 8a 20 00 ff ff . .. ....... ... backtrace: [<0000000034ec4724>] __kmem_cache_alloc_node+0x2f8/0x348 [<0000000057fbc15d>] __kmalloc_node_track_caller+0x5c/0x110 [<0000000055d5e34b>] krealloc+0x8c/0x178 [<00000000a4635beb>] coresight_alloc_device_name+0x128/0x188 [coresight] [<000000000ce9d17b>] smb_probe+0x268/0x478 [ultrasoc_smb] ... unreferenced object 0xffff00213c141000 (size 1024): comm "systemd-udevd", pid 2123, jiffies 4294909467 (age 6062.160s) hex dump (first 32 bytes): 04 00 00 00 02 00 00 00 18 10 14 3c 21 00 ff ff ...........<!... 00 00 00 00 00 00 00 00 03 00 00 00 10 00 00 00 ................ backtrace: [<000000004b7c9001>] __kmem_cache_alloc_node+0x2f8/0x348 [<00000000b0fc7ceb>] __kmalloc+0x58/0x108 [<0000000064ff4695>] acpi_os_allocate+0x2c/0x68 [<000000007d57d116>] acpi_ut_initialize_buffer+0x54/0xe0 [<0000000024583908>] acpi_evaluate_object+0x388/0x438 [<0000000017b2e72b>] acpi_evaluate_object_typed+0xe8/0x240 [<000000005df0eac2>] coresight_get_platform_data+0x1b4/0x988 [coresight] ... The patchset based on "coresight: platform: acpi: Ignore the absence of graph" https://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git/commit/… Junhao He (2): coresight: Fix memory leak in acpi_buffer->pointer coresight: core: fix memory leak in dict->fwnode_list drivers/hwtracing/coresight/coresight-core.c | 20 +++++++++- .../hwtracing/coresight/coresight-platform.c | 40 ++++++++++++------- 2 files changed, 45 insertions(+), 15 deletions(-) -- 2.33.0

2 years

[PATCH V3 0/3] coresight: etm: Make cycle count threshold user configurable

by Anshuman Khandual

This series makes ETM TRCCCCTRL based 'cc_threshold' user configurable via the perf event attribute. But first, this implements an errata work around affecting ETM TRCIDR3.CCITMIN value on certain cpus, overriding the field. This series applies on v6.5-rc5. Cc: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Will Deacon <will(a)kernel.org> Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: James Clark <james.clark(a)arm.com> Cc: Leo Yan <leo.yan(a)linaro.org> Cc: Jonathan Corbet <corbet(a)lwn.net> Cc: linux-doc(a)vger.kernel.org Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Changes in V3: - Added errata work around affecting TRCIDR3.CCITMIN - Split the document update into a separate patch Changes in V2: https://lore.kernel.org/all/20230808074533.380537-1-anshuman.khandual@arm.c… - s/treshhold/threshold Changes in V1: https://lore.kernel.org/all/20230804044720.1478900-1-anshuman.khandual@arm.… Anshuman Khandual (3): coresight: etm: Override TRCIDR3.CCITMIN on errata affected cpus coresight: etm: Make cycle count threshold user configurable Documentation: coresight: Add cc_threshold tunable Documentation/arch/arm64/silicon-errata.rst | 10 ++++ Documentation/trace/coresight/coresight.rst | 4 ++ .../hwtracing/coresight/coresight-etm-perf.c | 2 + .../coresight/coresight-etm4x-core.c | 49 ++++++++++++++++++- 4 files changed, 63 insertions(+), 2 deletions(-) -- 2.25.1

2 years

Re: How to debug SysReg access to ETE causing system crash

by Suzuki K Poulose

Hi Yabin On 17/08/2023 22:06, Yabin Cui wrote: > Hi coresight driver maintainers, > > I am from the Android toolchain team. I am trying to use ETE (Embedded > Trace Extension). But on my device, the system crashes when the ETM > driver is trying to read TRCDEVARCH via sysreg interface. When you say crashes, what exactly is reported ? Does the kernel get an exception ? Or system hangs completely ? I suspect : 1) You are running some hyp at EL2, which doesn't allow accessing the TRC* registers and injects a Illegal instruction ? 2) If not the above, the ETE is not powered (very unlikely) Suzuki > In > https://github.com/torvalds/linux/blob/master/drivers/hwtracing/coresight/c… <https://github.com/torvalds/linux/blob/master/drivers/hwtracing/coresight/c…> : > > static bool etm4_init_sysreg_access(struct etmv4_drvdata *drvdata, > struct csdev_access *csa) > { > u32 devarch; > > if (!cpu_supports_sysreg_trace()) <- this returns true > return false; > > /* > * ETMs implementing sysreg access must implement TRCDEVARCH. > */ > devarch = read_etm4x_sysreg_const_offset(TRCDEVARCH); <- never see the > message logged immediately after this line, so should abort here. > ... > } > > Do you have any suggestions on how I can debug the problem? Is there any > other place making sysreg interface to ETE not accessible? Or can the > ETE sysreg interface not be implemented? > I tried the memory mapped register interface of ETE, it works fine. The > only change I need is to bypass the devarch version check > in etm4_init_iomem_access, in in > https://github.com/torvalds/linux/blob/master/drivers/hwtracing/coresight/c… <https://github.com/torvalds/linux/blob/master/drivers/hwtracing/coresight/c…> > I wonder if we can allow iomem access for ETE if the sysreg access > doesn't work on some devices. > > Thanks, > Yabin

2 years

[PATCH] coresight: tmc: Make etr buffer mode user configurable from sysfs

by Anshuman Khandual

Currently TMC-ETR automatically selects the buffer mode from all available methods in the following sequentially fallback manner - also in that order. 1. FLAT mode with or without IOMMU 2. TMC-ETR-SG (scatter gather) mode when available 3. CATU mode when available But this order might not be ideal for all situations. For example if there is a CATU connected to ETR, it may be better to use TMC-ETR scatter gather method, rather than CATU. But hard coding such order changes will prevent us from testing or using a particular mode. This change provides following new sysfs tunables for the user to control TMC-ETR buffer mode explicitly, if required. /sys/bus/coresight/devices/tmc_etr<N>/etr_buf_modes_available /sys/bus/coresight/devices/tmc_etr<N>/etr_buf_mode_current $ cat etr_buf_modes_available auto flat tmc-sg catu ------------------> Supported TMC-ETR buffer modes $ echo catu > etr_buf_mode_current -------> Explicit buffer mode request But explicit user request has to be within supported ETR buffer modes only. These sysfs interface files are exclussive to ETR, and hence not available for other TMC devices such as ETB or ETF etc. This required separating out new 'coresight_etr_groups' from common 'coresight_tmc_groups'. This adds a new element 'etr_mode' in 'struct tmc_drvdata' which will track such explicit user directives. 'auto' mode has been added to help fallback to the existing default behaviour. ETR_MODE_FLAT mode availability follows existing logic as in tmc_alloc_etr_buf() creating a common helper function i.e etr_supports_flat_mode(). Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: James Clark <james.clark(a)arm.com> Cc: Leo Yan <leo.yan(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual(a)arm.com> --- .../testing/sysfs-bus-coresight-devices-tmc | 16 +++ .../hwtracing/coresight/coresight-tmc-core.c | 103 +++++++++++++++++- .../hwtracing/coresight/coresight-tmc-etr.c | 27 +++-- drivers/hwtracing/coresight/coresight-tmc.h | 10 ++ 4 files changed, 143 insertions(+), 13 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc index 6aa527296c71..956a2f090950 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc @@ -91,3 +91,19 @@ Contact: Mathieu Poirier <mathieu.poirier(a)linaro.org> Description: (RW) Size of the trace buffer for TMC-ETR when used in SYSFS mode. Writable only for TMC-ETR configurations. The value should be aligned to the kernel pagesize. + +What: /sys/bus/coresight/devices/<memory_map>.tmc/etr_buf_modes_available +Date: July 2023 +KernelVersion: 6.6 +Contact: Anshuman Khandual <anshuman.khandual(a)arm.com> +Description: (Read) Shows all supported Coresight TMC-ETR buffer modes available + for the users to configure explicitly. This file is avaialble only + for TMC ETR devices. + +What: /sys/bus/coresight/devices/<memory_map>.tmc/etr_buf_mode_current +Date: July 2023 +KernelVersion: 6.6 +Contact: Anshuman Khandual <anshuman.khandual(a)arm.com> +Description: (RW) Current Coresight TMC-ETR buffer mode selected. But user could + only provide a mode which is supported for a given ETR device. This + file is available only for TMC ETR devices. diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c index c106d142e632..ce97ff5e0997 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-core.c +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c @@ -10,6 +10,7 @@ #include <linux/device.h> #include <linux/idr.h> #include <linux/io.h> +#include <linux/iommu.h> #include <linux/err.h> #include <linux/fs.h> #include <linux/miscdevice.h> @@ -329,6 +330,85 @@ static ssize_t buffer_size_store(struct device *dev, static DEVICE_ATTR_RW(buffer_size); +static const char *const buf_modes_str[] = { + [ETR_MODE_FLAT] = "flat", + [ETR_MODE_ETR_SG] = "tmc-sg", + [ETR_MODE_CATU] = "catu", + [ETR_MODE_AUTO] = "auto", +}; + +void get_etr_buf_hw(struct device *dev, struct etr_buf_hw *buf_hw) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + + buf_hw->has_iommu = iommu_get_domain_for_dev(dev->parent); + buf_hw->has_etr_sg = tmc_etr_has_cap(drvdata, TMC_ETR_SG); + buf_hw->has_catu = !!tmc_etr_get_catu_device(drvdata); +} + +bool etr_supports_flat_mode(struct etr_buf_hw *buf_hw, ssize_t etr_buf_size) +{ + bool has_sg = buf_hw->has_catu || buf_hw->has_etr_sg; + + return !has_sg || buf_hw->has_iommu || etr_buf_size < SZ_1M; +} + +static ssize_t etr_buf_modes_available_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + struct etr_buf_hw buf_hw; + ssize_t size = 0; + + get_etr_buf_hw(dev, &buf_hw); + size += sysfs_emit(buf, "%s ", buf_modes_str[ETR_MODE_AUTO]); + if (etr_supports_flat_mode(&buf_hw, drvdata->size)) + size += sysfs_emit_at(buf, size, "%s ", buf_modes_str[ETR_MODE_FLAT]); + + if (buf_hw.has_etr_sg) + size += sysfs_emit_at(buf, size, "%s ", buf_modes_str[ETR_MODE_ETR_SG]); + + if (buf_hw.has_catu) + size += sysfs_emit_at(buf, size, "%s ", buf_modes_str[ETR_MODE_CATU]); + + size += sysfs_emit_at(buf, size, "\n"); + return size; +} +static DEVICE_ATTR_RO(etr_buf_modes_available); + +static ssize_t etr_buf_mode_current_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + + return sysfs_emit(buf, "%s\n", buf_modes_str[drvdata->etr_mode]); +} + +static ssize_t etr_buf_mode_current_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + struct etr_buf_hw buf_hw; + + get_etr_buf_hw(dev, &buf_hw); + if (sysfs_streq(buf, buf_modes_str[ETR_MODE_FLAT]) && + etr_supports_flat_mode(&buf_hw, drvdata->size)) + drvdata->etr_mode = ETR_MODE_FLAT; + else if (sysfs_streq(buf, buf_modes_str[ETR_MODE_ETR_SG]) && buf_hw.has_etr_sg) + drvdata->etr_mode = ETR_MODE_ETR_SG; + else if (sysfs_streq(buf, buf_modes_str[ETR_MODE_CATU]) && buf_hw.has_catu) + drvdata->etr_mode = ETR_MODE_CATU; + else if (sysfs_streq(buf, buf_modes_str[ETR_MODE_AUTO])) + drvdata->etr_mode = ETR_MODE_AUTO; + else + return -EINVAL; + + return size; + +} +static DEVICE_ATTR_RW(etr_buf_mode_current); + static struct attribute *coresight_tmc_attrs[] = { &dev_attr_trigger_cntr.attr, &dev_attr_buffer_size.attr, @@ -350,6 +430,24 @@ static const struct attribute_group *coresight_tmc_groups[] = { NULL, }; +static struct attribute *coresight_etr_attrs[] = { + &dev_attr_trigger_cntr.attr, + &dev_attr_buffer_size.attr, + &dev_attr_etr_buf_modes_available.attr, + &dev_attr_etr_buf_mode_current.attr, + NULL, +}; + +static const struct attribute_group coresight_etr_group = { + .attrs = coresight_etr_attrs, +}; + +static const struct attribute_group *coresight_etr_groups[] = { + &coresight_etr_group, + &coresight_tmc_mgmt_group, + NULL, +}; + static inline bool tmc_etr_can_use_sg(struct device *dev) { return fwnode_property_present(dev->fwnode, "arm,scatter-gather"); @@ -465,6 +563,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) drvdata->memwidth = tmc_get_memwidth(devid); /* This device is not associated with a session */ drvdata->pid = -1; + drvdata->etr_mode = ETR_MODE_AUTO; if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) { drvdata->size = tmc_etr_get_default_buffer_size(dev); @@ -474,16 +573,17 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) } desc.dev = dev; - desc.groups = coresight_tmc_groups; switch (drvdata->config_type) { case TMC_CONFIG_TYPE_ETB: + desc.groups = coresight_tmc_groups; desc.type = CORESIGHT_DEV_TYPE_SINK; desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; desc.ops = &tmc_etb_cs_ops; dev_list = &etb_devs; break; case TMC_CONFIG_TYPE_ETR: + desc.groups = coresight_etr_groups; desc.type = CORESIGHT_DEV_TYPE_SINK; desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM; desc.ops = &tmc_etr_cs_ops; @@ -496,6 +596,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) dev_list = &etr_devs; break; case TMC_CONFIG_TYPE_ETF: + desc.groups = coresight_tmc_groups; desc.type = CORESIGHT_DEV_TYPE_LINKSINK; desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO; diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 766325de0e29..d48455188243 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -841,23 +841,27 @@ static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata, int node, void **pages) { int rc = -ENOMEM; - bool has_etr_sg, has_iommu; - bool has_sg, has_catu; struct etr_buf *etr_buf; + struct etr_buf_hw buf_hw; struct device *dev = &drvdata->csdev->dev; - has_etr_sg = tmc_etr_has_cap(drvdata, TMC_ETR_SG); - has_iommu = iommu_get_domain_for_dev(dev->parent); - has_catu = !!tmc_etr_get_catu_device(drvdata); - - has_sg = has_catu || has_etr_sg; - + get_etr_buf_hw(dev, &buf_hw); etr_buf = kzalloc(sizeof(*etr_buf), GFP_KERNEL); if (!etr_buf) return ERR_PTR(-ENOMEM); etr_buf->size = size; + /* If there is user directive for buffer mode, try that first */ + if (drvdata->etr_mode != ETR_MODE_AUTO) { + rc = tmc_etr_mode_alloc_buf(drvdata->etr_mode, drvdata, + etr_buf, node, pages); + if (rc) { + kfree(etr_buf); + return ERR_PTR(rc); + } + } + /* * If we have to use an existing list of pages, we cannot reliably * use a contiguous DMA memory (even if we have an IOMMU). Otherwise, @@ -870,14 +874,13 @@ static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata, * Fallback to available mechanisms. * */ - if (!pages && - (!has_sg || has_iommu || size < SZ_1M)) + if (!pages && etr_supports_flat_mode(&buf_hw, size)) rc = tmc_etr_mode_alloc_buf(ETR_MODE_FLAT, drvdata, etr_buf, node, pages); - if (rc && has_etr_sg) + if (rc && buf_hw.has_etr_sg) rc = tmc_etr_mode_alloc_buf(ETR_MODE_ETR_SG, drvdata, etr_buf, node, pages); - if (rc && has_catu) + if (rc && buf_hw.has_catu) rc = tmc_etr_mode_alloc_buf(ETR_MODE_CATU, drvdata, etr_buf, node, pages); if (rc) { diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h index b97da39652d2..ca15ccb1d807 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -135,6 +135,13 @@ enum etr_mode { ETR_MODE_FLAT, /* Uses contiguous flat buffer */ ETR_MODE_ETR_SG, /* Uses in-built TMC ETR SG mechanism */ ETR_MODE_CATU, /* Use SG mechanism in CATU */ + ETR_MODE_AUTO, /* Use the default mechanism */ +}; + +struct etr_buf_hw { + bool has_iommu; + bool has_etr_sg; + bool has_catu; }; struct etr_buf_operations; @@ -207,6 +214,7 @@ struct tmc_drvdata { enum tmc_mem_intf_width memwidth; u32 trigger_cntr; u32 etr_caps; + enum etr_mode etr_mode; struct idr idr; struct mutex idr_mutex; struct etr_buf *sysfs_buf; @@ -334,5 +342,7 @@ void tmc_etr_set_catu_ops(const struct etr_buf_operations *catu); void tmc_etr_remove_catu_ops(void); struct etr_buf *tmc_etr_get_buffer(struct coresight_device *csdev, enum cs_mode mode, void *data); +void get_etr_buf_hw(struct device *dev, struct etr_buf_hw *buf_hw); +bool etr_supports_flat_mode(struct etr_buf_hw *buf_hw, ssize_t etr_buf_size); #endif -- 2.25.1

2 years

[PATCH V2] coresight: etm4x: Ensure valid drvdata and clock before clk_put()

by Anshuman Khandual

This validates 'drvdata' and 'drvdata->pclk' clock before calling clk_put() in etm4_remove_platform_dev(). The problem was detected using Smatch static checker as reported. Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: James Clark <james.clark(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Reported-by: Dan Carpenter <dan.carpenter(a)linaro.org> Closes: https://lists.linaro.org/archives/list/coresight@lists.linaro.org/thread/G4… Reviewed-by: James Clark <james.clark(a)arm.com> Reviewed-by: Mike Leach <mike.leach(a)lnaro.org> Signed-off-by: Anshuman Khandual <anshuman.khandual(a)arm.com> --- This applies on coresight-next Changes in V2: - Dropped drvdata->pclk check for non-NULL - Replaced IS_ERR() with IS_ERR_OR_NULL() for drvdata->pclk Changes in V1: https://lore.kernel.org/all/20230811062738.1066787-1-anshuman.khandual@arm.… drivers/hwtracing/coresight/coresight-etm4x-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 703b6fcbb6a5..77b0271ce6eb 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -2269,7 +2269,7 @@ static int __exit etm4_remove_platform_dev(struct platform_device *pdev) etm4_remove_dev(drvdata); pm_runtime_disable(&pdev->dev); - if (drvdata->pclk) + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) clk_put(drvdata->pclk); return 0; -- 2.25.1

2 years

[PATCH 0/2] Fix some issues with TRBE building as a module

by Junhao He

The TRBE driver support is build as a module, we found some driver issues based on the patchset [1] and set CONFIG_CORESIGHT_TRBE=m. 1. TRBE driver potential sleep in atomic context when unregister device 2. Multiple free the platform data resource when rmmod coresight TRBE driver [1] "coresight: trbe: Enable ACPI based devices" https://lore.kernel.org/all/20230808082247.383405-1-anshuman.khandual@arm.c… Junhao He (2): coresight: trbe: Fix TRBE potential sleep in atomic context coresight: core: Fix multiple free TRBE platform data resource drivers/hwtracing/coresight/coresight-core.c | 7 ++-- drivers/hwtracing/coresight/coresight-trbe.c | 35 +++++++++++--------- 2 files changed, 24 insertions(+), 18 deletions(-) -- 2.33.0

2 years

[PATCH V5 0/4] coresight: trbe: Enable ACPI based devices

by Anshuman Khandual

This series enables detection of ACPI based TRBE devices via a stand alone purpose built representative platform device. But as a pre-requisite this changes coresight_platform_data structure assignment for the TRBE device. This series is based on v6.5-rc5 kernel, is also dependent on the following EDK2 changes posted earlier by Sami. https://edk2.groups.io/g/devel/message/107239 https://edk2.groups.io/g/devel/message/107241 Changes in V5: - Detected zeroed parsed GSI as a mismatch but handled all zero scenario - Changed condition check from 'if (ret < 0)' into a 'if (ret)' - Dropped pr_warn() message after platform_device_register() Changes in V4: https://lore.kernel.org/all/20230808082247.383405-1-anshuman.khandual@arm.c… - Added in-code comment for arm_trbe_device_probe() - Reverted back using IS_ENABLED() for SPE PMU platform device - Replaced #ifdef with IS_ENABLED() for TRBE platform device - Protected arm_trbe_acpi_match with ACPI_PTR() - preventing a build failure when CONFIG_ACPI is not enabled - Added __maybe_unused for arm_acpi_register_pmu_device() and dropped config checks with IS_ENABLED() Changes in V3: https://lore.kernel.org/all/20230803055652.1322801-1-anshuman.khandual@arm.… - Changed ARMV8_TRBE_PDEV_NAME from "arm-trbe-acpi" into "arm,trbe" - Dropped local variable 'matched' - Replaced 'matched' with 'valid gsi' as being already matched once - Moved find_acpi_cpu_topology_hetero_id() outside conditional check Changes in V2: https://lore.kernel.org/all/20230801094052.750416-1-anshuman.khandual@arm.c… - Refactored arm_spe_acpi_register_device() in a separate patch - Renamed trbe_acpi_resources as trbe_resources - Renamed trbe_acpi_dev as trbe_dev Changes in V1: https://lore.kernel.org/all/20230728112733.359620-1-anshuman.khandual@arm.c… Cc: Sami Mujawar <sami.mujawar(a)arm.com> Cc: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Will Deacon <will(a)kernel.org> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Leo Yan <leo.yan(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: James Clark <james.clark(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Anshuman Khandual (4): arm_pmu: acpi: Refactor arm_spe_acpi_register_device() arm_pmu: acpi: Add a representative platform device for TRBE coresight: trbe: Add a representative coresight_platform_data for TRBE coresight: trbe: Enable ACPI based TRBE devices arch/arm64/include/asm/acpi.h | 3 + drivers/hwtracing/coresight/coresight-trbe.c | 26 +++- drivers/hwtracing/coresight/coresight-trbe.h | 2 + drivers/perf/arm_pmu_acpi.c | 142 ++++++++++++++----- include/linux/perf/arm_pmu.h | 1 + 5 files changed, 132 insertions(+), 42 deletions(-) -- 2.25.1

2 years

Re: [PATCH v5 5/6] perf vendor events arm64: Update stall_slot workaround for N2 r0p3

by James Clark

On 15/08/2023 10:40, John Garry wrote: > On 11/08/2023 15:39, James Clark wrote: >> N2 r0p3 doesn't require the workaround [1], so gating on (#slots - 5) no >> longer works because all N2s have 5 slots. Add a new expression builtin >> that allows calling strcmp_cpuid_str() and comparing CPUIDs in metric >> formulas. >> >> In this case, the commented formula looks like this: >> >> strcmp_cpuid_str(0x410fd493) # greater than or equal to N2 r0p3 >> | strcmp_cpuid_str(0x410fd490) ^ 1 # OR NOT any version of N2 >> >> [1]:https://urldefense.com/v3/__https://gitlab.arm.com/telemetry-solution/te… Signed-off-by: James Clark<james.clark(a)arm.com> >> --- >> tools/perf/arch/arm64/util/pmu.c | 18 +----------------- >> .../arch/arm64/arm/neoverse-n2-v2/metrics.json | 8 ++++---- >> tools/perf/pmu-events/metric.py | 17 +++++++++++++++-- >> tools/perf/util/expr.c | 18 ++++++++++++++++++ >> tools/perf/util/expr.h | 1 + >> tools/perf/util/expr.l | 1 + >> tools/perf/util/expr.y | 8 +++++++- >> tools/perf/util/pmu.c | 17 +++++++++++++++++ >> tools/perf/util/pmu.h | 1 + >> 9 files changed, 65 insertions(+), 24 deletions(-) > > This patch looks ok, but I think that it would be better to separate out > the metrics.json change into a separate patch. > Yep I thought about doing that, I can change it in the next version. > Thanks, > John

2 years

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