CoreSight

coresight@lists.linaro.org

6 participants
2566 discussions

by Mathieu Poirier

Hi David, I am CC'ing the coresight mailing list as it is the best way to get coresight related support on various issues. I have also included Sai who has worked on coresight on the dragon board 845. Regarding autoFDO, Mike Leach recently posted a patchset [1] that automatically configures autoFDO on a platform. You can either work with that patchset or use a scripted solution that Al Grant and Robert Walker have been using. Thanks, Mathieu [1]. https://lists.linaro.org/pipermail/coresight/2020-June/004078.html ---------- Forwarded message --------- From: David Cunado <David.Cunado(a)arm.com> Date: Mon, 29 Jun 2020 at 05:14 Subject: Coresight - help To: Mathieu Poirier <mathieu.poirier(a)linaro.org>, Dave Rodgman <dave.rodgman(a)arm.com> Cc: bill.fletcher(a)linaro.org <bill.fletcher(a)linaro.org> Hi Mathieu, James King passed me your details as you have had expensive experience with Coresight support in many platforms. One of our OSS teams here at Arm is working with Google to try to get Auto FDO working on DragonBoard 845 – do you know whether Coresight is ‘usable’ on this board and if so, if there are any tips on getting it to work? I’ve CC’ed Dave Rodgman, the Tech Lead for the team, who can provide additional technical details. Thanks! David david cunado | open source software group | Arm tel: +44 1223 404112 | mob: +44 7827 230 654 IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

5 years, 5 months

[PATCH v5 0/5] Update CoreSight infrastructure to select a default sink.

by Mike Leach

This patchset provides an infrastructure to allow for the automatic selection of a sink during CoreSight tracing operations. Currently starting tracing using perf requires a sink selection on the command line:- sudo ./perf record -e cs_etm/@tmc_etr0/ --per-thread uname -a After this set (and the follow-up perf change set) the infrastructure will be able to select a default sink:- sudo ./perf record -e cs_etm// --per-thread uname -a This matches with the default operation provided with perf and intelpt. Where no sink is specified at the start of a trace session, the CoreSight system will walk the connection graph from the source ETM, to find a suitable sink using the first encountered highest priority device. The CoreSight infrastructure is updated to define sink sub_types to differentiate between sinks with built in buffers (ETB / ETF) - BUFFER type, and those that use system memory (ETR) - SYSMEM - types. SYSMEM types are considered higher priority. When two sinks are found of equal priority, then the closest sink to the source in terms of connection nodes is chosen. The automatic sink selection will also operate if an ETM is enabled using sysfs commands, and no sink is currently enabled. A last_sink attribute is added to trace sources that is set to the value of the sink used when a source is enabled via sysfs. This is set in both default and user enabled sink scenarios. Applies to Linux 5.8-rc1 Tested on Dragonboard DB410c. Changes since v4: 1) Added reviewed-by etc that were missing from previous sets. 2) Added last_sink attribute to source devices. 3) Added documentation patch to update docs for default sinks. 4) Moved comment fix patch into separate misc fixes set. Mike Leach (5): coresight: Add default sink selection to CoreSight base. coresight: tmc: Update sink types for default selection. coresight: etm: perf: Add default sink selection to etm perf. coresight: sysfs: Allow select default sink on source enable. documentation: coresight: Update CoreSight document for default sink. Documentation/trace/coresight/coresight.rst | 48 ++-- .../hwtracing/coresight/coresight-etm-perf.c | 17 +- drivers/hwtracing/coresight/coresight-priv.h | 2 + drivers/hwtracing/coresight/coresight-tmc.c | 3 +- drivers/hwtracing/coresight/coresight.c | 205 +++++++++++++++++- include/linux/coresight.h | 6 + 6 files changed, 261 insertions(+), 20 deletions(-) -- 2.17.1

5 years, 5 months

[PATCH v2] coresight: etmv4: Fix CPU power management setup in probe() function.

by Mike Leach

The current probe() function calls a pair of cpuhp_xxx API functions to setup CPU hotplug handling. The hotplug lock is held for the duration of the two calls and other CPU related code using cpus_read_lock() / cpus_read_unlock() calls. The problem is that on error states, goto: statements bypass the cpus_read_unlock() call. This code has increased in complexity as the driver has developed. This patch introduces a pair of helper functions etm4_pm_setup_cpuslocked() and etm4_pm_clear() which correct the issues above and group the PM code a little better. The two functions etm4_cpu_pm_register() and etm4_cpu_pm_unregister() are dropped as these call cpu_pm_register_notifier() / ..unregister_notifier() dependent on CONFIG_CPU_PM - but this define is used to nop these functions out in the pm headers - so the wrapper functions are superfluous. Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states") Fixes: e9f5d63f84fe ("hwtracing/coresight-etm4x: Use cpuhp_setup_state_nocalls_cpuslocked()") Fixes: 58eb457be028 ("etm4x: Convert to hotplug state machine") Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- drivers/hwtracing/coresight/coresight-etm4x.c | 82 ++++++++++++------- 1 file changed, 53 insertions(+), 29 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 82fc2fab072a..2d732af8b3e7 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -1398,18 +1398,57 @@ static struct notifier_block etm4_cpu_pm_nb = { .notifier_call = etm4_cpu_pm_notify, }; -static int etm4_cpu_pm_register(void) +/* Setup PM. Called with cpus locked. Deals with error conditions and counts */ +static int etm4_pm_setup_cpuslocked(void) { - if (IS_ENABLED(CONFIG_CPU_PM)) - return cpu_pm_register_notifier(&etm4_cpu_pm_nb); + int ret; - return 0; + if (etm4_count++) + return 0; + + ret = cpu_pm_register_notifier(&etm4_cpu_pm_nb); + if (ret) + goto reduce_count; + + ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING, + "arm/coresight4:starting", + etm4_starting_cpu, etm4_dying_cpu); + + if (ret) + goto unregister_notifier; + + ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, + "arm/coresight4:online", + etm4_online_cpu, NULL); + + /* HP dyn state ID returned in ret on success */ + if (ret > 0) { + hp_online = ret; + return 0; + } + + /* failed dyn state - remove others */ + cpuhp_remove_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING); + +unregister_notifier: + cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); + +reduce_count: + --etm4_count; + return ret; } -static void etm4_cpu_pm_unregister(void) +static void etm4_pm_clear(void) { - if (IS_ENABLED(CONFIG_CPU_PM)) - cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); + if (--etm4_count != 0) + return; + + cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); + cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); + if (hp_online) { + cpuhp_remove_state_nocalls(hp_online); + hp_online = 0; + } } static int etm4_probe(struct amba_device *adev, const struct amba_id *id) @@ -1466,24 +1505,15 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) etm4_init_arch_data, drvdata, 1)) dev_err(dev, "ETM arch init failed\n"); - if (!etm4_count++) { - cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING, - "arm/coresight4:starting", - etm4_starting_cpu, etm4_dying_cpu); - ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, - "arm/coresight4:online", - etm4_online_cpu, NULL); - if (ret < 0) - goto err_arch_supported; - hp_online = ret; + ret = etm4_pm_setup_cpuslocked(); + cpus_read_unlock(); - ret = etm4_cpu_pm_register(); - if (ret) - goto err_arch_supported; + /* etm4_pm_setup_cpuslocked() does its own cleanup - exit on error */ + if (ret) { + etmdrvdata[drvdata->cpu] = NULL; + return ret; } - cpus_read_unlock(); - if (etm4_arch_supported(drvdata->arch) == false) { ret = -EINVAL; goto err_arch_supported; @@ -1530,13 +1560,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) err_arch_supported: etmdrvdata[drvdata->cpu] = NULL; - if (--etm4_count == 0) { - etm4_cpu_pm_unregister(); - - cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); - if (hp_online) - cpuhp_remove_state_nocalls(hp_online); - } + etm4_pm_clear(); return ret; } -- 2.17.1

5 years, 5 months

[PATCH] coresight: etmv4: Fix CPU power management setup in probe() function.

by Mike Leach

The current probe() function calls a pair of cpuhp_xxx API functions to setup CPU hotplug handling. The hotplug lock is held for the duration of the two calls and other CPU related code using cpus_read_lock() / cpus_read_unlock() calls. The problem is that on error states, goto: statements bypass the cpus_read_unlock() call. This code has increased in complexity as the driver has developed. This patch introduces a pair of helper functions etm4_pm_setup() and etm4_pm_clear() which correct the issues above and group the PM code a little better. The two functions etm4_cpu_pm_register() and etm4_cpu_pm_unregister() are dropped as these call cpu_pm_register_notifier() / ..unregister_notifier() dependent on CONFIG_CPU_PM - but this define is used to nop these functions out in the pm headers - so the wrapper functions are superfluous. Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states") Fixes: e9f5d63f84fe ("hwtracing/coresight-etm4x: Use cpuhp_setup_state_nocalls_cpuslocked()") Fixes: 58eb457be028 ("etm4x: Convert to hotplug state machine") Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- drivers/hwtracing/coresight/coresight-etm4x.c | 79 ++++++++++++------- 1 file changed, 51 insertions(+), 28 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 919b76fa49c4..4dd59de440de 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -1407,18 +1407,56 @@ static struct notifier_block etm4_cpu_pm_nb = { .notifier_call = etm4_cpu_pm_notify, }; -static int etm4_cpu_pm_register(void) +/* Setup PM. Called with cpus locked. Deals with error conditions and counts */ +static int etm4_pm_setup_cpuslocked(void) { - if (IS_ENABLED(CONFIG_CPU_PM)) - return cpu_pm_register_notifier(&etm4_cpu_pm_nb); + int ret; - return 0; + if (etm4_count++) + return 0; + + ret = cpu_pm_register_notifier(&etm4_cpu_pm_nb); + if (ret) + goto reduce_count; + + ret = cpuhp_setup_state_nocalls_cpuslocked( + CPUHP_AP_ARM_CORESIGHT_STARTING, "arm/coresight4:starting", + etm4_starting_cpu, etm4_dying_cpu); + + if (ret) + goto unregister_notifier; + + ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, + "arm/coresight4:online", + etm4_online_cpu, NULL); + + /* HP dyn state ID returned in ret on success */ + if (ret > 0) { + hp_online = ret; + return 0; + } + + /* failed dyn state - remove others */ + cpuhp_remove_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING); + +unregister_notifier: + cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); + +reduce_count: + --etm4_count; + return ret; } -static void etm4_cpu_pm_unregister(void) +static void etm4_pm_clear(void) { - if (IS_ENABLED(CONFIG_CPU_PM)) + if (--etm4_count == 0) { cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); + cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); + if (hp_online) { + cpuhp_remove_state_nocalls(hp_online); + hp_online = 0; + } + } } static int etm4_probe(struct amba_device *adev, const struct amba_id *id) @@ -1475,24 +1513,15 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) etm4_init_arch_data, drvdata, 1)) dev_err(dev, "ETM arch init failed\n"); - if (!etm4_count++) { - cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING, - "arm/coresight4:starting", - etm4_starting_cpu, etm4_dying_cpu); - ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, - "arm/coresight4:online", - etm4_online_cpu, NULL); - if (ret < 0) - goto err_arch_supported; - hp_online = ret; + ret = etm4_pm_setup_cpuslocked(); + cpus_read_unlock(); - ret = etm4_cpu_pm_register(); - if (ret) - goto err_arch_supported; + /* etm4_pm_setup does its own cleanup - just exit on error here */ + if (ret) { + etmdrvdata[drvdata->cpu] = NULL; + return ret; } - cpus_read_unlock(); - if (etm4_arch_supported(drvdata->arch) == false) { ret = -EINVAL; goto err_arch_supported; @@ -1544,13 +1573,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) err_arch_supported: etmdrvdata[drvdata->cpu] = NULL; - if (--etm4_count == 0) { - etm4_cpu_pm_unregister(); - - cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); - if (hp_online) - cpuhp_remove_state_nocalls(hp_online); - } + etm4_pm_clear(); return ret; } -- 2.17.1

5 years, 5 months

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5 years, 5 months

[PATCHv3] coresight: tmc: Add shutdown callback for TMC ETR

by Sai Prakash Ranjan

Implement a shutdown callback to ensure ETR hardware is properly shutdown in reboot/shutdown path. This is required for ETR which has SMMU address translation enabled like on SC7180 SoC and few others. If the hardware is still accessing memory after SMMU translation is disabled as part of SMMU shutdown callback in system reboot or shutdown path, then IOVAs(I/O virtual address) which it was using will go on the bus as the physical addresses which might result in unknown crashes (NoC/interconnect errors). So we make sure from this shutdown callback that the ETR is shutdown before SMMU translation is disabled and device_link in SMMU driver will take care of ordering of shutdown callbacks such that SMMU shutdown callback is not called before any of its consumer shutdown callbacks. Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan(a)codeaurora.org> --- Changes since v2: * Remove ETF/ETB disable as suggested by Mathieu and Mike since they are not really affected. * Remove coresight and misc device unregister since it is not required for shutdown callback unlike remove callback and userspace is long gone by this time. Changes since v1: * Use mode flag and drop enable flag as Mike suggested. * Use spinlock before tmc hw disable as Mike suggested. --- .../hwtracing/coresight/coresight-tmc-etr.c | 2 +- drivers/hwtracing/coresight/coresight-tmc.c | 23 +++++++++++++++++++ drivers/hwtracing/coresight/coresight-tmc.h | 1 + 3 files changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 625882bc8b08..b29c2db94d96 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1110,7 +1110,7 @@ static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) } -static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) +void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) { __tmc_etr_disable_hw(drvdata); /* Disable CATU device if this ETR is connected to one */ diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c index 39fba1d16e6e..b13ce0daa572 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.c +++ b/drivers/hwtracing/coresight/coresight-tmc.c @@ -538,6 +538,28 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) return ret; } +static void tmc_shutdown(struct amba_device *adev) +{ + unsigned long flags; + struct tmc_drvdata *drvdata = amba_get_drvdata(adev); + + spin_lock_irqsave(&drvdata->spinlock, flags); + + if (drvdata->mode == CS_MODE_DISABLED) + goto out; + + if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) + tmc_etr_disable_hw(drvdata); + + /* + * We do not care about coresight unregister here unlike remove + * callback which is required for making coresight modular since + * the system is going down after this. + */ +out: + spin_unlock_irqrestore(&drvdata->spinlock, flags); +} + static const struct amba_id tmc_ids[] = { CS_AMBA_ID(0x000bb961), /* Coresight SoC 600 TMC-ETR/ETS */ @@ -556,6 +578,7 @@ static struct amba_driver tmc_driver = { .suppress_bind_attrs = true, }, .probe = tmc_probe, + .shutdown = tmc_shutdown, .id_table = tmc_ids, }; builtin_amba_driver(tmc_driver); diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h index 71de978575f3..6e8d2dc33d17 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -268,6 +268,7 @@ ssize_t tmc_etb_get_sysfs_trace(struct tmc_drvdata *drvdata, /* ETR functions */ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata); int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata); +void tmc_etr_disable_hw(struct tmc_drvdata *drvdata); extern const struct coresight_ops tmc_etr_cs_ops; ssize_t tmc_etr_get_sysfs_trace(struct tmc_drvdata *drvdata, loff_t pos, size_t len, char **bufpp); base-commit: 059e38815950dbec65beafe03757bce9436e89a4 -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

5 years, 5 months

[PATCH] coresight: tmc: Fix TMC mode read in tmc_read_unprepare_etb()

by Sai Prakash Ranjan

Reading TMC mode register without proper coresight power management can lead to exceptions like the one in the call trace below in tmc_read_unprepare_etb() when the trace data is read after the sink is disabled. So fix this by having a check for coresight sysfs mode before reading TMC mode management register in tmc_read_unprepare_etb() similar to tmc_read_prepare_etb(). SError Interrupt on CPU6, code 0xbe000411 -- SError pstate: 80400089 (Nzcv daIf +PAN -UAO) pc : tmc_read_unprepare_etb+0x74/0x108 lr : tmc_read_unprepare_etb+0x54/0x108 sp : ffffff80d9507c30 x29: ffffff80d9507c30 x28: ffffff80b3569a0c x27: 0000000000000000 x26: 00000000000a0001 x25: ffffff80cbae9550 x24: 0000000000000010 x23: ffffffd07296b0f0 x22: ffffffd0109ee028 x21: 0000000000000000 x20: ffffff80d19e70e0 x19: ffffff80d19e7080 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: dfffffd000000001 x9 : 0000000000000000 x8 : 0000000000000002 x7 : ffffffd071d0fe78 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffffffd071d0fe98 x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001 Kernel panic - not syncing: Asynchronous SError Interrupt Fixes: 4525412a5046 ("coresight: tmc: making prepare/unprepare functions generic") Reported-by: Mike Leach <mike.leach(a)linaro.org> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan(a)codeaurora.org> --- drivers/hwtracing/coresight/coresight-tmc-etf.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index 36cce2bfb744..6375504ba8b0 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -639,15 +639,14 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata) spin_lock_irqsave(&drvdata->spinlock, flags); - /* There is no point in reading a TMC in HW FIFO mode */ - mode = readl_relaxed(drvdata->base + TMC_MODE); - if (mode != TMC_MODE_CIRCULAR_BUFFER) { - spin_unlock_irqrestore(&drvdata->spinlock, flags); - return -EINVAL; - } - /* Re-enable the TMC if need be */ if (drvdata->mode == CS_MODE_SYSFS) { + /* There is no point in reading a TMC in HW FIFO mode */ + mode = readl_relaxed(drvdata->base + TMC_MODE); + if (mode != TMC_MODE_CIRCULAR_BUFFER) { + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return -EINVAL; + } /* * The trace run will continue with the same allocated trace * buffer. As such zero-out the buffer so that we don't end base-commit: 3d439a6c349778f129de19595db564a8366c3634 -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

5 years, 5 months

Flushing PTM traces manually.

by Mounir NASR ALLAH

Hi all, I am currently facing a problem about manually flushing traces. The traced user application runs on a Linux distribution with an FPGA Board based on a Zynq-7000 SoC. I am setting up coresight components for tracing only the user application PID and his address space, and I exclude tracing kernel. All traces are exported to a monitor present in the FPGA. The flow of the traces: ————————————— ——————— ————————— | | | | | | | ARM Cortex A9 (Core 0) | ==> | TPIU | ==> | FPGA Monitor | | / PTM | | | | | ————————————— ——————— ————————— When there is a syscall on the user application, I have the traces below: … 16274 (a waypoint update packet) ffff0008 (the exception branch address) 16278 .. The relative addresses/assembly instructions extracted from the ELF file are : 16270: e89c0078 ldm ip, {r3, r4, r5, r6} 16274: ef000000 svc 0x00000000 16278: e8bd00f0 pop {r4, r5, r6, r7} During the execution of the syscall (on the Kernel side), the kernel needs to receive a response from the FPGA Monitor and wait actively for it. This response depends on calculations relative to all PTM traces before the syscall (SVC instruction at 16274). That’s why I need to flush all traces during the syscall, I tried to flush traces by setting the FOnMan_W of the Formatter and Flush Control Register (FFCR) into coresight-tpiu.c but that’s not working. Do you have an idea of how correctly flushing all traces to the FPGA Monitor on the kernel? Best regards, Mounir

5 years, 5 months

Re: [Bug] OpenCSD STM infinite loop

by Mike Leach

Thanks for the snapshot. A patch has been sent to the Coresight Mailing list. Please let me know if this solves your problem. Thanks Mike On Wed, 17 Jun 2020 at 12:01, subhasish Karmakar <subhasish.k2301(a)gmail.com> wrote: > > Hello Mike, > > Sorry for the late reply. I missed your email. > Please find the configuration and binary file attached. > > Thanks alot for your support, > Subhasish > > On Fri, Jun 12, 2020 at 9:32 PM Mike Leach <mike.leach(a)linaro.org> wrote: >> >> Hi Subhasish, >> >> Can you provide a reproducer in the form of a trace snapshot for this. >> This would be some binary STM data + config files that can be >> processed by the library test program trc_pkt_lister. >> See opencsd/decoder/tests/snapshots/stm_only for an example of a >> snapshot with STM data. >> >> Thanks >> >> Mike >> >> On Thu, 11 Jun 2020 at 07:38, subhasish Karmakar >> <subhasish.k2301(a)gmail.com> wrote: >> > >> > Hi All, >> > >> > I am seeing this bug in STM decoder. >> > Where STM decoder is going into an infinite loop and never comes out of it. >> > >> > I have pasted the debug patch and log excerpts for your reference. >> > Read "Bug Description" from Step-1 to Step-6 for detailed explanation. >> > Please help me with a fix. >> > >> > Debug Patch: >> > -------------------------------------- >> > diff --git a/decoder/source/stm/trc_pkt_proc_stm.cpp b/decoder/source/stm/trc_pkt_proc_stm.cpp >> > index b39a053..3bc754f 100644 >> > --- a/decoder/source/stm/trc_pkt_proc_stm.cpp >> > +++ b/decoder/source/stm/trc_pkt_proc_stm.cpp >> > @@ -81,7 +81,10 @@ ocsd_datapath_resp_t TrcPktProcStm::processData( const ocsd_trc_index_t index, >> > m_p_data_in = pDataBlock; >> > m_data_in_size = dataBlockSize; >> > m_data_in_used = 0; >> > - >> > + >> > + printf("while-entry (m_data_in_used[%d] < m_data_in_size[%d]) || m_nibble_2nd_valid[%d] || (m_proc_state[%d] == SEND_PKT)\n", >> > + m_data_in_used,m_data_in_size,m_nibble_2nd_valid,m_proc_state); >> > + >> > // while there is data and a continue response on the data path >> > while( dataToProcess() && OCSD_DATA_RESP_IS_CONT(resp) ) >> > { >> > @@ -141,6 +144,8 @@ ocsd_datapath_resp_t TrcPktProcStm::processData( const ocsd_trc_index_t index, >> > fatal.setMessage("Unknown System Error decoding trace."); >> > LogError(fatal); >> > } >> > + >> > + /*** Bug Description Step-4: m_data_in_used = 12 < m_data_in_size = 14, exit condition does not satisfy in processData(). >> > + Control enters into waitForSync() again ***/ >> > + >> > + printf("while-exit (m_data_in_used[%d] < m_data_in_size[%d]) || m_nibble_2nd_valid[%d] || (m_proc_state[%d] == SEND_PKT)\n", >> > + m_data_in_used,m_data_in_size,m_nibble_2nd_valid,m_proc_state); >> > } >> > >> > *numBytesProcessed = m_data_in_used; >> > @@ -249,9 +254,12 @@ void TrcPktProcStm::waitForSync(const ocsd_trc_index_t blk_st_index) >> > >> > m_bWaitSyncSaveSuppressed = true; // no need to save bytes until we want to send data. >> > >> > + /*** Bug Description Step-1: m_data_in_used = 0 and m_data_in_size = 14 for first time entry. ***/ >> > + /*** Bug Description Step-5: m_data_in_used = 12 and m_data_in_size = 14 for second time entry. >> > + But m_is_sync = TRUE, control does not enter into while loop . readNibble() is not called. ***/ >> > + >> > + printf("(bGotData[%d] && !m_is_sync[%d])\n", bGotData, m_is_sync); >> > while(bGotData && !m_is_sync) >> > { >> > bGotData = readNibble(); // read until we have a sync or run out of data >> > + >> > + /*** Bug Description Step-2: m_data_in_used = 12 and m_is_sync = TRUE, when we have found sync packet. ***/ >> > + >> > + printf("m_data_in_used[%d], m_nibble_2nd_valid[%d], m_num_nibbles[%d], m_is_sync[%d]\n", >> > + m_data_in_used, m_nibble_2nd_valid, m_num_nibbles, m_is_sync); >> > } >> > >> > m_bWaitSyncSaveSuppressed = false; >> > @@ -272,7 +280,7 @@ void TrcPktProcStm::waitForSync(const ocsd_trc_index_t blk_st_index) >> > { >> > // for a), b), c) send the none sync data then re-enter >> > // if out of data, or sync with some previous data, this is sent as unsynced. >> > - >> > + >> > + /*** Bug Description Step-3: m_data_in_used = 12 and m_data_in_size = 14 NOTSYNC packet sent ***/ >> > + /*** Bug Description Step-6: step 3 to 6 creates an infinite loop. ***/ >> > + >> > + printf("(!bGotData[%d] || m_num_nibbles[%d] > 22)\n", bGotData, m_num_nibbles); >> > m_curr_packet.setPacketType(STM_PKT_NOTSYNC,false); >> > if(mon_in_use.usingMonitor()) >> > { >> > >> > Log With Debug Patch: >> > ------------------------------------------ >> > while-entry (m_data_in_used[0] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[0] == SEND_PKT) >> > (bGotData[1] && !m_is_sync[0]) >> > m_data_in_used[1], m_nibble_2nd_valid[1], m_num_nibbles[1], m_is_sync[0] >> > m_data_in_used[1], m_nibble_2nd_valid[0], m_num_nibbles[2], m_is_sync[0] >> > m_data_in_used[2], m_nibble_2nd_valid[1], m_num_nibbles[3], m_is_sync[0] >> > m_data_in_used[2], m_nibble_2nd_valid[0], m_num_nibbles[4], m_is_sync[0] >> > m_data_in_used[3], m_nibble_2nd_valid[1], m_num_nibbles[5], m_is_sync[0] >> > m_data_in_used[3], m_nibble_2nd_valid[0], m_num_nibbles[6], m_is_sync[0] >> > m_data_in_used[4], m_nibble_2nd_valid[1], m_num_nibbles[7], m_is_sync[0] >> > m_data_in_used[4], m_nibble_2nd_valid[0], m_num_nibbles[8], m_is_sync[0] >> > m_data_in_used[5], m_nibble_2nd_valid[1], m_num_nibbles[9], m_is_sync[0] >> > m_data_in_used[5], m_nibble_2nd_valid[0], m_num_nibbles[10], m_is_sync[0] >> > m_data_in_used[6], m_nibble_2nd_valid[1], m_num_nibbles[11], m_is_sync[0] >> > m_data_in_used[6], m_nibble_2nd_valid[0], m_num_nibbles[12], m_is_sync[0] >> > m_data_in_used[7], m_nibble_2nd_valid[1], m_num_nibbles[13], m_is_sync[0] >> > m_data_in_used[7], m_nibble_2nd_valid[0], m_num_nibbles[14], m_is_sync[0] >> > m_data_in_used[8], m_nibble_2nd_valid[1], m_num_nibbles[15], m_is_sync[0] >> > m_data_in_used[8], m_nibble_2nd_valid[0], m_num_nibbles[16], m_is_sync[0] >> > m_data_in_used[9], m_nibble_2nd_valid[1], m_num_nibbles[17], m_is_sync[0] >> > m_data_in_used[9], m_nibble_2nd_valid[0], m_num_nibbles[18], m_is_sync[0] >> > m_data_in_used[10], m_nibble_2nd_valid[1], m_num_nibbles[19], m_is_sync[0] >> > m_data_in_used[10], m_nibble_2nd_valid[0], m_num_nibbles[20], m_is_sync[0] >> > m_data_in_used[11], m_nibble_2nd_valid[1], m_num_nibbles[21], m_is_sync[0] >> > m_data_in_used[11], m_nibble_2nd_valid[0], m_num_nibbles[22], m_is_sync[0] >> > m_data_in_used[12], m_nibble_2nd_valid[1], m_num_nibbles[23], m_is_sync[0] >> > m_data_in_used[12], m_nibble_2nd_valid[0], m_num_nibbles[24], m_is_sync[1] >> > (!bGotData[1] || m_num_nibbles[24] > 22) >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[3] == SEND_PKT) >> > Idx:0;[ 0xF1 ];NOTSYNC:STM not synchronised >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[0] == SEND_PKT) >> > (bGotData[1] && !m_is_sync[1]) >> > (!bGotData[1] || m_num_nibbles[23] > 22) >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[3] == SEND_PKT) >> > Idx:12;[ 0x0F ];NOTSYNC:STM not synchronised >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[0] == SEND_PKT) >> > (bGotData[1] && !m_is_sync[1]) >> > (!bGotData[1] || m_num_nibbles[23] > 22) >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[3] == SEND_PKT) >> > Idx:12;[ 0x0F ];NOTSYNC:STM not synchronised >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[0] == SEND_PKT) >> > (bGotData[1] && !m_is_sync[1]) >> > (!bGotData[1] || m_num_nibbles[23] > 22) >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[3] == SEND_PKT) >> > Idx:12;[ 0x0F ];NOTSYNC:STM not synchronised >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[0] == SEND_PKT) >> > (bGotData[1] && !m_is_sync[1]) >> > (!bGotData[1] || m_num_nibbles[23] > 22) >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[3] == SEND_PKT) >> > Idx:12;[ 0x0F ];NOTSYNC:STM not synchronised >> > while-exit (m_data_in_used[12] < m_data_in_size[14]) || m_nibble_2nd_valid[0] || (m_proc_state[0] == SEND_PKT) >> > (bGotData[1] && !m_is_sync[1]) >> > (!bGotData[1] || m_num_nibbles[23] > 22) >> > >> > >> > Thank alot for your support, >> > Subhasish >> > _______________________________________________ >> > CoreSight mailing list >> > CoreSight(a)lists.linaro.org >> > https://lists.linaro.org/mailman/listinfo/coresight >> >> >> >> -- >> Mike Leach >> Principal Engineer, ARM Ltd. >> Manchester Design Centre. UK -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

5 years, 5 months

[PATCH] opencsd: stm: Fix Async detection bug.

by Mike Leach

Issue with ASYNC detection caused infinite loop if a 21x 0xF 1x 0x0 async was preceded by one or more 0xF nibbles. Patch ensures 0xF sync nibble count capped at 21. Reported by subhasish.k2301(a)gmail.com. Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- decoder/include/opencsd/stm/trc_pkt_proc_stm.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/decoder/include/opencsd/stm/trc_pkt_proc_stm.h b/decoder/include/opencsd/stm/trc_pkt_proc_stm.h index 909ac0c..bc4391b 100644 --- a/decoder/include/opencsd/stm/trc_pkt_proc_stm.h +++ b/decoder/include/opencsd/stm/trc_pkt_proc_stm.h @@ -239,7 +239,8 @@ inline void TrcPktProcStm::checkSyncNibble() if((m_nibble == 0) && (m_num_F_nibbles >= 21)) { - m_is_sync = true; //this nibble marks a sync sequence - keep the F nibble count + m_is_sync = true; //this nibble marks a sync sequence + m_num_F_nibbles = 21; // set the F nibble count - lose any extra as unsynced data. } else { -- 2.17.1

5 years, 5 months

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