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4 years, 6 months

[PATCH AUTOSEL 5.4 40/80] coresight: Make sysfs functional on topologies with per core sink

by Sasha Levin

From: Linu Cherian <lcherian(a)marvell.com> [ Upstream commit 6d578258b955fc8888e1bbd9a8fefe7b10065a84 ] Coresight driver assumes sink is common across all the ETMs, and tries to build a path between ETM and the first enabled sink found using bus based search. This breaks sysFS usage on implementations that has multiple per core sinks in enabled state. To fix this, coresight_get_enabled_sink API is updated to do a connection based search starting from the given source, instead of bus based search. With sink selection using sysfs depecrated for perf interface, provision for reset is removed as well in this API. Signed-off-by: Linu Cherian <lcherian(a)marvell.com> [Fixed indentation problem and removed obsolete comment] Signed-off-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-15-mathieu.poirier@linaro.… Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- drivers/hwtracing/coresight/coresight-priv.h | 3 +- drivers/hwtracing/coresight/coresight.c | 62 +++++++++----------- 2 files changed, 29 insertions(+), 36 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index 82e563cdc8794..dfd24b85a5775 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -147,7 +147,8 @@ static inline void coresight_write_reg_pair(void __iomem *addr, u64 val, void coresight_disable_path(struct list_head *path); int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data); struct coresight_device *coresight_get_sink(struct list_head *path); -struct coresight_device *coresight_get_enabled_sink(bool reset); +struct coresight_device * +coresight_get_enabled_sink(struct coresight_device *source); struct coresight_device *coresight_get_sink_by_id(u32 id); struct list_head *coresight_build_path(struct coresight_device *csdev, struct coresight_device *sink); diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 0bbce0d291582..90ecd04a2f20b 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -481,50 +481,46 @@ struct coresight_device *coresight_get_sink(struct list_head *path) return csdev; } -static int coresight_enabled_sink(struct device *dev, const void *data) +static struct coresight_device * +coresight_find_enabled_sink(struct coresight_device *csdev) { - const bool *reset = data; - struct coresight_device *csdev = to_coresight_device(dev); + int i; + struct coresight_device *sink; if ((csdev->type == CORESIGHT_DEV_TYPE_SINK || csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) && - csdev->activated) { - /* - * Now that we have a handle on the sink for this session, - * disable the sysFS "enable_sink" flag so that possible - * concurrent perf session that wish to use another sink don't - * trip on it. Doing so has no ramification for the current - * session. - */ - if (*reset) - csdev->activated = false; + csdev->activated) + return csdev; - return 1; + /* + * Recursively explore each port found on this element. + */ + for (i = 0; i < csdev->pdata->nr_outport; i++) { + struct coresight_device *child_dev; + + child_dev = csdev->pdata->conns[i].child_dev; + if (child_dev) + sink = coresight_find_enabled_sink(child_dev); + if (sink) + return sink; } - return 0; + return NULL; } /** - * coresight_get_enabled_sink - returns the first enabled sink found on the bus - * @deactivate: Whether the 'enable_sink' flag should be reset + * coresight_get_enabled_sink - returns the first enabled sink using + * connection based search starting from the source reference * - * When operated from perf the deactivate parameter should be set to 'true'. - * That way the "enabled_sink" flag of the sink that was selected can be reset, - * allowing for other concurrent perf sessions to choose a different sink. - * - * When operated from sysFS users have full control and as such the deactivate - * parameter should be set to 'false', hence mandating users to explicitly - * clear the flag. + * @source: Coresight source device reference */ -struct coresight_device *coresight_get_enabled_sink(bool deactivate) +struct coresight_device * +coresight_get_enabled_sink(struct coresight_device *source) { - struct device *dev = NULL; - - dev = bus_find_device(&coresight_bustype, NULL, &deactivate, - coresight_enabled_sink); + if (!source) + return NULL; - return dev ? to_coresight_device(dev) : NULL; + return coresight_find_enabled_sink(source); } static int coresight_sink_by_id(struct device *dev, const void *data) @@ -764,11 +760,7 @@ int coresight_enable(struct coresight_device *csdev) goto out; } - /* - * Search for a valid sink for this session but don't reset the - * "enable_sink" flag in sysFS. Users get to do that explicitly. - */ - sink = coresight_get_enabled_sink(false); + sink = coresight_get_enabled_sink(csdev); if (!sink) { ret = -EINVAL; goto out; -- 2.25.1

4 years, 6 months

[PATCH AUTOSEL 5.8 067/132] coresight: Make sysfs functional on topologies with per core sink

by Sasha Levin

From: Linu Cherian <lcherian(a)marvell.com> [ Upstream commit 6d578258b955fc8888e1bbd9a8fefe7b10065a84 ] Coresight driver assumes sink is common across all the ETMs, and tries to build a path between ETM and the first enabled sink found using bus based search. This breaks sysFS usage on implementations that has multiple per core sinks in enabled state. To fix this, coresight_get_enabled_sink API is updated to do a connection based search starting from the given source, instead of bus based search. With sink selection using sysfs depecrated for perf interface, provision for reset is removed as well in this API. Signed-off-by: Linu Cherian <lcherian(a)marvell.com> [Fixed indentation problem and removed obsolete comment] Signed-off-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-15-mathieu.poirier@linaro.… Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- drivers/hwtracing/coresight/coresight-priv.h | 3 +- drivers/hwtracing/coresight/coresight.c | 62 +++++++++----------- 2 files changed, 29 insertions(+), 36 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index 36c943ae94d52..e383bc72143d8 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -148,7 +148,8 @@ static inline void coresight_write_reg_pair(void __iomem *addr, u64 val, void coresight_disable_path(struct list_head *path); int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data); struct coresight_device *coresight_get_sink(struct list_head *path); -struct coresight_device *coresight_get_enabled_sink(bool reset); +struct coresight_device * +coresight_get_enabled_sink(struct coresight_device *source); struct coresight_device *coresight_get_sink_by_id(u32 id); struct list_head *coresight_build_path(struct coresight_device *csdev, struct coresight_device *sink); diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index f3efbb3b2b4d1..f834255b013f3 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -540,50 +540,46 @@ struct coresight_device *coresight_get_sink(struct list_head *path) return csdev; } -static int coresight_enabled_sink(struct device *dev, const void *data) +static struct coresight_device * +coresight_find_enabled_sink(struct coresight_device *csdev) { - const bool *reset = data; - struct coresight_device *csdev = to_coresight_device(dev); + int i; + struct coresight_device *sink; if ((csdev->type == CORESIGHT_DEV_TYPE_SINK || csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) && - csdev->activated) { - /* - * Now that we have a handle on the sink for this session, - * disable the sysFS "enable_sink" flag so that possible - * concurrent perf session that wish to use another sink don't - * trip on it. Doing so has no ramification for the current - * session. - */ - if (*reset) - csdev->activated = false; + csdev->activated) + return csdev; - return 1; + /* + * Recursively explore each port found on this element. + */ + for (i = 0; i < csdev->pdata->nr_outport; i++) { + struct coresight_device *child_dev; + + child_dev = csdev->pdata->conns[i].child_dev; + if (child_dev) + sink = coresight_find_enabled_sink(child_dev); + if (sink) + return sink; } - return 0; + return NULL; } /** - * coresight_get_enabled_sink - returns the first enabled sink found on the bus - * @deactivate: Whether the 'enable_sink' flag should be reset + * coresight_get_enabled_sink - returns the first enabled sink using + * connection based search starting from the source reference * - * When operated from perf the deactivate parameter should be set to 'true'. - * That way the "enabled_sink" flag of the sink that was selected can be reset, - * allowing for other concurrent perf sessions to choose a different sink. - * - * When operated from sysFS users have full control and as such the deactivate - * parameter should be set to 'false', hence mandating users to explicitly - * clear the flag. + * @source: Coresight source device reference */ -struct coresight_device *coresight_get_enabled_sink(bool deactivate) +struct coresight_device * +coresight_get_enabled_sink(struct coresight_device *source) { - struct device *dev = NULL; - - dev = bus_find_device(&coresight_bustype, NULL, &deactivate, - coresight_enabled_sink); + if (!source) + return NULL; - return dev ? to_coresight_device(dev) : NULL; + return coresight_find_enabled_sink(source); } static int coresight_sink_by_id(struct device *dev, const void *data) @@ -823,11 +819,7 @@ int coresight_enable(struct coresight_device *csdev) goto out; } - /* - * Search for a valid sink for this session but don't reset the - * "enable_sink" flag in sysFS. Users get to do that explicitly. - */ - sink = coresight_get_enabled_sink(false); + sink = coresight_get_enabled_sink(csdev); if (!sink) { ret = -EINVAL; goto out; -- 2.25.1

4 years, 6 months

[PATCH] coresight: add module license

by Arnd Bergmann

From: Arnd Bergmann <arnd(a)arndb.de> When built as a loadable module, coresight now causes a warning about missing license information. WARNING: modpost: missing MODULE_LICENSE() in drivers/hwtracing/coresight/coresight.o Fixes: 8e264c52e1da ("coresight: core: Allow the coresight core driver to be built as a module") Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- drivers/hwtracing/coresight/coresight-core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 6994c1309b2b..cc9e8025c533 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -1689,6 +1689,7 @@ static void __exit coresight_exit(void) module_init(coresight_init); module_exit(coresight_exit); +MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Pratik Patel <pratikp(a)codeaurora.org>"); MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier(a)linaro.org>"); MODULE_DESCRIPTION("Arm CoreSight tracer driver"); -- 2.27.0

4 years, 6 months

[PATCH 0/2] coresight: etf/etb: NULL Pointer dereference crash fixes

by Sai Prakash Ranjan

There was a report of NULL pointer dereference in ETF enable path for perf CS mode with PID monitoring. It is almost 100% reproducible when the process to monitor is something very active such as chrome and with ETF as the sink and not ETR. Currently in a bid to find the pid, the owner is dereferenced via task_pid_nr() call in tmc_enable_etf_sink_perf() and with owner being NULL, we get a NULL pointer dereference. Looking at the ETR and other places in the kernel, ETF and the ETB are the only places trying to dereference the task(owner) in tmc_enable_etf_sink_perf() which is also called from the sched_in path as in the call trace. Owner(task) is NULL even in the case of ETR in tmc_enable_etr_sink_perf(), but since we cache the PID in alloc_buffer() callback and it is done as part of etm_setup_aux() when allocating buffer for ETR sink, we never dereference this NULL pointer and we are safe. So lets do the same thing with ETF and ETB and cache the PID to which the cs_buffer belongs in alloc_buffer() callback for ETF and ETB as done for ETR. This will also remove the unnecessary function calls (task_pid_nr()) in tmc_enable_etr_sink_perf() and etb_enable_perf(). Easily reproducible running below: perf record -e cs_etm/@tmc_etf0/ -N -p <pid> Unable to handle kernel NULL pointer dereference at virtual address 0000000000000548 Mem abort info: ESR = 0x96000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 <snip>... Call trace: tmc_enable_etf_sink+0xe4/0x280 coresight_enable_path+0x168/0x1fc etm_event_start+0x8c/0xf8 etm_event_add+0x38/0x54 event_sched_in+0x194/0x2ac group_sched_in+0x54/0x12c flexible_sched_in+0xd8/0x120 visit_groups_merge+0x100/0x16c ctx_flexible_sched_in+0x50/0x74 ctx_sched_in+0xa4/0xa8 perf_event_sched_in+0x60/0x6c perf_event_context_sched_in+0x98/0xe0 __perf_event_task_sched_in+0x5c/0xd8 finish_task_switch+0x184/0x1cc schedule_tail+0x20/0xec ret_from_fork+0x4/0x18 Sai Prakash Ranjan (2): coresight: tmc-etf: Fix NULL ptr dereference in tmc_enable_etf_sink_perf() coresight: etb10: Fix possible NULL ptr dereference in etb_enable_perf() drivers/hwtracing/coresight/coresight-etb10.c | 4 +++- drivers/hwtracing/coresight/coresight-priv.h | 2 ++ drivers/hwtracing/coresight/coresight-tmc-etf.c | 4 +++- 3 files changed, 8 insertions(+), 2 deletions(-) base-commit: 3477326277451000bc667dfcc4fd0774c039184c -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

4 years, 6 months

Embedded Linux Conference Europe - 2020 Attendees List

by Laura Miller

Hi, Just writing to check if you would be interested in acquiring the attendees list of "Embedded Linux Conference Europe" Virtual|Oct 26th - 29th - 2020| Each record will contain details like: Contact Name, Title, Phone Number, Fax Number, Physical address, State/City, Company Name, Company URL, and most importantly verified email addresses. Let us know if you are interested and we will revert back with cost and other deliverables. Regards, Laura Miller| Sales Team| Email: laura(a)globaltradevisitors.com "If you don't wish to receive email from us please reply back with Opt Out"

4 years, 6 months

Bug report: lockdep warning for CTI probe

by Leo Yan

Hi all, After I enabled kernel configs CONFIG_LOCKDEP and CONFIG_LOCK_STAT on the mainline kernel, the kernel reports warning as below. Read a bit the code, the issue seems is related with the CTI's SysFS attribution: "cti_desc.groups = drvdata->ctidev.con_groups;", which might not initialize properly so cause this warning. [ 5.372901] coresight etm0: CPU0: ETM v4.0 initialized [ 5.376694] coresight etm1: CPU1: ETM v4.0 initialized [ 5.380785] coresight etm2: CPU2: ETM v4.0 initialized [ 5.385851] coresight etm3: CPU3: ETM v4.0 initialized [ 5.389808] BUG: key ffff00000564a798 has not been registered! [ 5.392456] ------------[ cut here ]------------ [ 5.398195] DEBUG_LOCKS_WARN_ON(1) [ 5.398233] WARNING: CPU: 1 PID: 32 at kernel/locking/lockdep.c:4623 lockdep_init_map_waits+0x14c/0x260 [ 5.406149] Modules linked in: [ 5.415411] CPU: 1 PID: 32 Comm: kworker/1:1 Not tainted 5.9.0-12034-gbbe85027ce80 #51 [ 5.418553] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) [ 5.426453] Workqueue: events amba_deferred_retry_func [ 5.433299] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--) [ 5.438252] pc : lockdep_init_map_waits+0x14c/0x260 [ 5.444410] lr : lockdep_init_map_waits+0x14c/0x260 [ 5.449007] sp : ffff800012bbb720 [ 5.453862] x29: ffff800012bbb720 x28: ffff00000564a680 [ 5.457342] x27: ffff00000564a780 x26: 0000000000001000 [ 5.462725] x25: 0000000000000000 x24: 0000000000000000 [ 5.468020] x23: ffff00000564a880 x22: 0000000000000000 [ 5.473315] x21: ffff800012a0f000 x20: ffff00000564a798 [ 5.478610] x19: ffff00000564f848 x18: ffffffffffffffff [ 5.483905] x17: 000000000000000e x16: ffff00000396ce91 [ 5.489200] x15: ffff800012231e08 x14: 0720072007200720 [ 5.494496] x13: 0720072007200720 x12: 0720072007200720 [ 5.499790] x11: 0720072007200720 x10: 0720072007200720 [ 5.505085] x9 : 00000035a0335c60 x8 : ffff8000122af890 [ 5.510380] x7 : 0000000000000001 x6 : ffff800012bbb330 [ 5.515676] x5 : 0000000000000000 x4 : ffff00000366d040 [ 5.520971] x3 : ffff800012232000 x2 : 0000000000000000 [ 5.526266] x1 : 8a612923d8958600 x0 : 0000000000000000 [ 5.531561] Call trace: [ 5.536847] lockdep_init_map_waits+0x14c/0x260 [ 5.539027] __kernfs_create_file+0xa8/0x1c8 [ 5.543539] sysfs_add_file_mode_ns+0xd0/0x208 [ 5.548054] internal_create_group+0x118/0x3c8 [ 5.552307] internal_create_groups+0x58/0xb8 [ 5.556733] sysfs_create_groups+0x2c/0x38 [ 5.561160] device_add+0x2d8/0x768 [ 5.565148] device_register+0x28/0x38 [ 5.568537] coresight_register+0xf8/0x320 [ 5.572358] cti_probe+0x1b0/0x3f0 [ 5.576433] amba_probe+0xc0/0x168 [ 5.579820] really_probe+0x118/0x408 [ 5.583207] driver_probe_device+0x5c/0xc0 [ 5.586940] __device_attach_driver+0x98/0xc8 [ 5.590933] bus_for_each_drv+0x80/0xe0 [ 5.595359] __device_attach+0xf4/0x158 [ 5.599006] device_initial_probe+0x24/0x30 [ 5.602825] bus_probe_device+0xa0/0xa8 [ 5.606992] device_add+0x47c/0x768 [ 5.610809] amba_device_try_add+0x1f4/0x310 [ 5.614284] amba_deferred_retry+0x54/0xb8 [ 5.618797] amba_deferred_retry_func+0x14/0x50 [ 5.622706] process_one_work+0x2b8/0x698 [ 5.627130] worker_thread+0x50/0x458 [ 5.631297] kthread+0x11c/0x150 Thanks, Leo

4 years, 6 months

[PATCH] coresight: etm4x: Skip setting LPOVERRIDE bit for qcom, skip-power-up

by Sai Prakash Ranjan

There is a bug on the systems supporting to skip power up (qcom,skip-power-up) where setting LPOVERRIDE bit(low-power state override behaviour) will result in CPU hangs/lockups even on the implementations which supports it. So skip setting the LPOVERRIDE bit for such platforms. Fixes: 02510a5aa78d ("coresight: etm4x: Add support to skip trace unit power up") Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan(a)codeaurora.org> --- 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 abd706b216ac..6096d7abf80d 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -779,7 +779,7 @@ static void etm4_init_arch_data(void *info) * LPOVERRIDE, bit[23] implementation supports * low-power state override */ - if (BMVAL(etmidr5, 23, 23)) + if (BMVAL(etmidr5, 23, 23) && (!drvdata->skip_power_up)) drvdata->lpoverride = true; else drvdata->lpoverride = false; base-commit: 3477326277451000bc667dfcc4fd0774c039184c -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

4 years, 6 months

Fwd: Servicio Tributaria - N� (356384)

by Notificacion Pendiente

4 years, 6 months

Arm DevSummit - 2020 Attendees List

by Holly Richard

Hi, I believe that you are one of the Exhibitors of "Arm DevSummit 2020". If you are interested in acquiring the attendees list of "Arm DevSummit 2020" please reply to this email and I shall revert back with pricing, counts. Each record will contain details like Contact Name, Number, Email Address, Company Name, URL, Physical Address, Phone etc.. and you basically get to own these Opt-in contacts. Let us know if you are interested and we will revert back with cost and other deliverables. Thank you and I look forward to hear from you soon. Regards, Holly Richard| Inside Sales, USA & Europe| Email: <mailto:holly@reachattendee.com> holly(a)reachattendee.com "If you don't wish to receive emails from us reply back with LEAVE OUT"

4 years, 7 months

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