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2020-09-28coresight: Use IS_ENABLED for CONFIGs that may be modulesKim Phillips2-2/+2
Checking for ifdef CONFIG_x fails if CONFIG_x=m. Use IS_ENABLED that is true for both built-ins and modules, instead. Required when building coresight components as modules. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Russell King <linux@armlinux.org.uk> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Kim Phillips <kim.phillips@arm.com> Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200928163513.70169-4-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-28coresight: cpu_debug: Define MODULE_DEVICE_TABLETingwei Zhang1-0/+2
Define a MODULE_DEVICE_TABLE for cpu_debug so module can be auto loaded on boot. Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200928163513.70169-3-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-28coresight: cpu_debug: Add module name in KconfigTingwei Zhang1-0/+3
Provide name of cpu_debug module in Kconfig help section. Tested-by: Mike Leach <mike.leach@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200928163513.70169-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Fix number of resources check for ETM 4.3 and aboveMike Leach2-1/+10
The initialisation code checks TRCIDR4 to determine the number of resource selectors available on the system. Since ETM v 4.3, the value 0 has a different meaning. This patch takes into account this change. Signed-off-by: Mike Leach <mike.leach@linaro.org> [Removed '.' in patch title, added stable] Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-17-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Fix mis-usage of nr_resource in sysfs interfaceJonathan Zhou1-3/+6
The member @nr_resource represents how many resource selector pairs, and the pair 0 is always implemented and reserved. So let's multiply by 2 when resetting the selector configuration. And also update the validation of the input @idx. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Shaokun Zhang <zhangshaokun@hisilicon.com> Signed-off-by: Jonathan Zhou <jonathan.zhouwen@huawei.com> [Fixed typographical error in changelog, added stable] Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-16-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: Make sysfs functional on topologies with per core sinkLinu Cherian2-36/+29
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@marvell.com> [Fixed indentation problem and removed obsolete comment] Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-15-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm: perf: Sink selection using sysfs is deprecatedLinu Cherian1-2/+0
When using the perf interface, sink selection using sysfs is deprecated. Signed-off-by: Linu Cherian <lcherian@marvell.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-14-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Fix issues on trcseqevr accessJonathan Zhou1-2/+2
The TRCSEQEVR(3) is reserved, using '@nrseqstate - 1' instead to avoid accessing the reserved register. Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states") Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Shaokun Zhang <zhangshaokun@hisilicon.com> Signed-off-by: Jonathan Zhou <jonathan.zhouwen@huawei.com> [Fixed capital letter in title] Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-12-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Handle unreachable sink in perf modeSuzuki K Poulose1-0/+10
If the specified/hinted sink is not reachable from a subset of the CPUs, we could end up unable to trace the event on those CPUs. This is the best effort we could do until we support 1:1 configurations. Fail gracefully in such cases avoiding a WARN_ON, which can be easily triggered by the user on certain platforms (Arm N1SDP), with the following trace paths : CPU0 \ -- Funnel0 --> ETF0 --> / \ CPU1 \ MainFunnel CPU2 / \ / -- Funnel1 --> ETF1 --> / CPU1 $ perf record --per-thread -e cs_etm/@ETF0/u -- <app> could trigger the following WARNING, when the event is scheduled on CPU2. [10919.513250] ------------[ cut here ]------------ [10919.517861] WARNING: CPU: 2 PID: 24021 at drivers/hwtracing/coresight/coresight-etm-perf.c:316 etm_event_start+0xf8/0x100 ... [10919.564403] CPU: 2 PID: 24021 Comm: perf Not tainted 5.8.0+ #24 [10919.570308] pstate: 80400089 (Nzcv daIf +PAN -UAO BTYPE=--) [10919.575865] pc : etm_event_start+0xf8/0x100 [10919.580034] lr : etm_event_start+0x80/0x100 [10919.584202] sp : fffffe001932f940 [10919.587502] x29: fffffe001932f940 x28: fffffc834995f800 [10919.592799] x27: 0000000000000000 x26: fffffe0011f3ced0 [10919.598095] x25: fffffc837fce244c x24: fffffc837fce2448 [10919.603391] x23: 0000000000000002 x22: fffffc8353529c00 [10919.608688] x21: fffffc835bb31000 x20: 0000000000000000 [10919.613984] x19: fffffc837fcdcc70 x18: 0000000000000000 [10919.619281] x17: 0000000000000000 x16: 0000000000000000 [10919.624577] x15: 0000000000000000 x14: 00000000000009f8 [10919.629874] x13: 00000000000009f8 x12: 0000000000000018 [10919.635170] x11: 0000000000000000 x10: 0000000000000000 [10919.640467] x9 : fffffe00108cd168 x8 : 0000000000000000 [10919.645763] x7 : 0000000000000020 x6 : 0000000000000001 [10919.651059] x5 : 0000000000000002 x4 : 0000000000000001 [10919.656356] x3 : 0000000000000000 x2 : 0000000000000000 [10919.661652] x1 : fffffe836eb40000 x0 : 0000000000000000 [10919.666949] Call trace: [10919.669382] etm_event_start+0xf8/0x100 [10919.673203] etm_event_add+0x40/0x60 [10919.676765] event_sched_in.isra.134+0xcc/0x210 [10919.681281] merge_sched_in+0xb0/0x2a8 [10919.685017] visit_groups_merge.constprop.140+0x15c/0x4b8 [10919.690400] ctx_sched_in+0x15c/0x170 [10919.694048] perf_event_sched_in+0x6c/0xa0 [10919.698130] ctx_resched+0x60/0xa0 [10919.701517] perf_event_exec+0x288/0x2f0 [10919.705425] begin_new_exec+0x4c8/0xf58 [10919.709247] load_elf_binary+0x66c/0xf30 [10919.713155] exec_binprm+0x15c/0x450 [10919.716716] __do_execve_file+0x508/0x748 [10919.720711] __arm64_sys_execve+0x40/0x50 [10919.724707] do_el0_svc+0xf4/0x1b8 [10919.728095] el0_sync_handler+0xf8/0x124 [10919.732003] el0_sync+0x140/0x180 Even though we don't support using separate sinks for the ETMs yet (e.g, for 1:1 configurations), we should at least honor the user's choice and handle the limitations gracefully, by simply skipping the tracing on ETMs which can't reach the requested sink. Fixes: f9d81a657bb8 ("coresight: perf: Allow tracing on hotplugged CPUs") Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Reported-by: Jeremy Linton <jeremy.linton@arm.com> Tested-by: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-11-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: cti: Write regsiters directly in cti_enable_hw()Tingwei Zhang1-19/+5
Deadlock as below is triggered by one CPU holds drvdata->spinlock and calls cti_enable_hw(). Smp_call_function_single() is called in cti_enable_hw() and tries to let another CPU write CTI registers. That CPU is trying to get drvdata->spinlock in cti_cpu_pm_notify() and doesn't response to IPI from smp_call_function_single(). [ 988.335937] CPU: 6 PID: 10258 Comm: sh Tainted: G W L 5.8.0-rc6-mainline-16783-gc38daa79b26b-dirty #1 [ 988.346364] Hardware name: Thundercomm Dragonboard 845c (DT) [ 988.352073] pstate: 20400005 (nzCv daif +PAN -UAO BTYPE=--) [ 988.357689] pc : smp_call_function_single+0x158/0x1b8 [ 988.362782] lr : smp_call_function_single+0x124/0x1b8 ... [ 988.451638] Call trace: [ 988.454119] smp_call_function_single+0x158/0x1b8 [ 988.458866] cti_enable+0xb4/0xf8 [coresight_cti] [ 988.463618] coresight_control_assoc_ectdev+0x6c/0x128 [coresight] [ 988.469855] coresight_enable+0x1f0/0x364 [coresight] [ 988.474957] enable_source_store+0x5c/0x9c [coresight] [ 988.480140] dev_attr_store+0x14/0x28 [ 988.483839] sysfs_kf_write+0x38/0x4c [ 988.487532] kernfs_fop_write+0x1c0/0x2b0 [ 988.491585] vfs_write+0xfc/0x300 [ 988.494931] ksys_write+0x78/0xe0 [ 988.498283] __arm64_sys_write+0x18/0x20 [ 988.502240] el0_svc_common+0x98/0x160 [ 988.506024] do_el0_svc+0x78/0x80 [ 988.509377] el0_sync_handler+0xd4/0x270 [ 988.513337] el0_sync+0x164/0x180 This change write CTI registers directly in cti_enable_hw(). Config->hw_powered has been checked to be true with spinlock holded. CTI is powered and can be programmed until spinlock is released. Fixes: 6a0953ce7de9 ("coresight: cti: Add CPU idle pm notifer to CTI devices") Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> [Re-ordered variable declaration] Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-10-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Fix issues within reset interface of sysfsJonathan Zhou1-1/+1
The member @nr_addr_cmp is not a bool value, using operator '>' instead to avoid unexpected failure. Fixes: a77de2637c9e ("coresight: etm4x: moving sysFS entries to a dedicated file") Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Shaokun Zhang <zhangshaokun@hisilicon.com> Signed-off-by: Jonathan Zhou <jonathan.zhouwen@huawei.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-9-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Ensure default perf settings filter user/kernelMike Leach2-10/+25
Moving from using an address filter to trace the default "all addresses" range to no filtering to acheive the same result, has caused the perf filtering of kernel/user address spaces from not working unless an explicit address filter was used. This is due to the original code using a side-effect of the address filtering rather than setting the global TRCVICTLR exception level filtering. The use of the mode sysfs file is also similarly affected. A helper function is added to fix both instances. Fixes: ae2041510d5d ("coresight: etmv4: Update default filter and initialisation") Reported-by: Leo Yan <leo.yan@linaro.org> Tested-by: Leo Yan <leo.yan@linaro.org> Reviewed-by: Leo Yan <leo.yan@linaro.org> Signed-off-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-8-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: cti: remove pm_runtime_get_sync() from CPU hotplugTingwei Zhang1-3/+0
Below BUG is triggered by call pm_runtime_get_sync() in cti_cpuhp_enable_hw(). It's in CPU hotplug callback with interrupt disabled. Pm_runtime_get_sync() calls clock driver to enable clock which could sleep. Remove pm_runtime_get_sync() in cti_cpuhp_enable_hw() since pm_runtime_get_sync() is called in cti_enabld and pm_runtime_put() is called in cti_disabled. No need to increase pm count when CPU gets online since it's not decreased when CPU is offline. [ 105.800279] BUG: scheduling while atomic: swapper/1/0/0x00000002 [ 105.800290] Modules linked in: [ 105.800327] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 5.9.0-rc1-gff1304be0a05-dirty #21 [ 105.800337] Hardware name: Thundercomm Dragonboard 845c (DT) [ 105.800353] Call trace: [ 105.800414] dump_backtrace+0x0/0x1d4 [ 105.800439] show_stack+0x14/0x1c [ 105.800462] dump_stack+0xc0/0x100 [ 105.800490] __schedule_bug+0x58/0x74 [ 105.800523] __schedule+0x590/0x65c [ 105.800538] schedule+0x78/0x10c [ 105.800553] schedule_timeout+0x188/0x250 [ 105.800585] qmp_send.constprop.10+0x12c/0x1b0 [ 105.800599] qmp_qdss_clk_prepare+0x18/0x20 [ 105.800622] clk_core_prepare+0x48/0xd4 [ 105.800639] clk_prepare+0x20/0x34 [ 105.800663] amba_pm_runtime_resume+0x54/0x90 [ 105.800695] __rpm_callback+0xdc/0x138 [ 105.800709] rpm_callback+0x24/0x78 [ 105.800724] rpm_resume+0x328/0x47c [ 105.800739] __pm_runtime_resume+0x50/0x74 [ 105.800768] cti_starting_cpu+0x40/0xa4 [ 105.800795] cpuhp_invoke_callback+0x84/0x1e0 [ 105.800814] notify_cpu_starting+0x9c/0xb8 [ 105.800834] secondary_start_kernel+0xd8/0x164 [ 105.800933] CPU1: Booted secondary processor 0x0000000100 [0x517f803c] Fixes: e9b880581d55 ("coresight: cti: Add CPU Hotplug handling to CTI driver") Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-7-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: cti: disclaim device only when it's claimedTingwei Zhang1-1/+2
Coresight_claim_device() is called in cti_starting_cpu() only when CTI is enabled while coresight_disclaim_device() is called uncontionally in cti_dying_cpu(). This triggered below WARNING. Only call disclaim device when CTI device is enabled to fix it. [ 75.989643] WARNING: CPU: 1 PID: 14 at kernel/drivers/hwtracing/coresight/coresight.c:209 coresight_disclaim_device_unlocked+0x10/0x24 [ 75.989697] CPU: 1 PID: 14 Comm: migration/1 Not tainted 5.9.0-rc1-gff1304be0a05-dirty #21 [ 75.989709] Hardware name: Thundercomm Dragonboard 845c (DT) [ 75.989737] pstate: 80c00085 (Nzcv daIf +PAN +UAO BTYPE=--) [ 75.989758] pc : coresight_disclaim_device_unlocked+0x10/0x24 [ 75.989775] lr : coresight_disclaim_device+0x24/0x38 [ 75.989783] sp : ffff800011cd3c90 . [ 75.990018] Call trace: [ 75.990041] coresight_disclaim_device_unlocked+0x10/0x24 [ 75.990066] cti_dying_cpu+0x34/0x4c [ 75.990101] cpuhp_invoke_callback+0x84/0x1e0 [ 75.990121] take_cpu_down+0x90/0xe0 [ 75.990154] multi_cpu_stop+0x134/0x160 [ 75.990171] cpu_stopper_thread+0xb0/0x13c [ 75.990196] smpboot_thread_fn+0x1c4/0x270 [ 75.990222] kthread+0x128/0x154 [ 75.990251] ret_from_fork+0x10/0x18 Fixes: e9b880581d55 ("coresight: cti: Add CPU Hotplug handling to CTI driver") Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-6-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Add Support for HiSilicon ETM deviceQi Liu1-0/+2
Add ETMv4 periperhal ID for HiSilicon Hip08 and Hip09 platform. Hip08 contains ETMv4.2 device and Hip09 contains ETMv4.5 device. Acked-by: Suzuki K Poulose <suzuki.oulose@arm.com> Signed-off-by: Qi Liu <liuqi115@huawei.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-5-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: fix offset by one error in counting portsMian Yousaf Kaukab1-5/+5
Since port-numbers start from 0, add 1 to port-number to get the port count. Fix following crash when Coresight is enabled on ACPI based systems: [ 61.061736] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 ... [ 61.135494] pc : acpi_coresight_parse_graph+0x1c4/0x37c [ 61.140705] lr : acpi_coresight_parse_graph+0x160/0x37c [ 61.145915] sp : ffff800012f4ba40 [ 61.145917] x29: ffff800012f4ba40 x28: ffff00becce62f98 [ 61.159896] x27: 0000000000000005 x26: ffff00becd8a7c88 [ 61.165195] x25: ffff00becd8a7d88 x24: ffff00becce62f80 [ 61.170492] x23: ffff800011ef99c0 x22: ffff009efb8bc010 [ 61.175790] x21: 0000000000000018 x20: 0000000000000005 [ 61.181087] x19: ffff00becce62e80 x18: 0000000000000020 [ 61.186385] x17: 0000000000000001 x16: 00000000000002a8 [ 61.191682] x15: ffff000838648550 x14: ffffffffffffffff [ 61.196980] x13: 0000000000000000 x12: ffff00becce62d87 [ 61.202277] x11: 00000000ffffff76 x10: 000000000000002e [ 61.207575] x9 : ffff8000107e1a68 x8 : ffff00becce63000 [ 61.212873] x7 : 0000000000000018 x6 : 000000000000003f [ 61.218170] x5 : 0000000000000000 x4 : 0000000000000000 [ 61.223467] x3 : 0000000000000000 x2 : 0000000000000000 [ 61.228764] x1 : ffff00becce62f80 x0 : 0000000000000000 [ 61.234062] Call trace: [ 61.236497] acpi_coresight_parse_graph+0x1c4/0x37c [ 61.241361] coresight_get_platform_data+0xdc/0x130 [ 61.246225] tmc_probe+0x138/0x2dc [ 61.246227] amba_probe+0xdc/0x220 [ 61.255779] really_probe+0xe8/0x49c [ 61.255781] driver_probe_device+0xec/0x140 [ 61.255782] device_driver_attach+0xc8/0xd0 [ 61.255785] __driver_attach+0xac/0x180 [ 61.265857] bus_for_each_dev+0x78/0xcc [ 61.265859] driver_attach+0x2c/0x40 [ 61.265861] bus_add_driver+0x150/0x244 [ 61.265863] driver_register+0x80/0x13c [ 61.273591] amba_driver_register+0x60/0x70 [ 61.273594] tmc_driver_init+0x20/0x2c [ 61.281582] do_one_initcall+0x50/0x230 [ 61.281585] do_initcalls+0x104/0x144 [ 61.291831] kernel_init_freeable+0x168/0x1dc [ 61.291834] kernel_init+0x1c/0x120 [ 61.299215] ret_from_fork+0x10/0x18 [ 61.299219] Code: b9400022 f9400660 9b277c42 8b020000 (f9400404) [ 61.307381] ---[ end trace 63c6c3d7ec6a9b7c ]--- [ 61.315225] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Fixes: d375b356e687 ("coresight: Fix support for sparsely populated ports") Reported-by: Ruediger Oertel <ro@suse.com> Tested-by: Jeremy Linton <jeremy.linton@arm.com> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-4-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: stm: Support marked packetTingwei Zhang1-4/+7
STP_PACKET_MARKED is not supported by STM currently. Add STM_FLAG_MARKED to support marked packet in STM. Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-3-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-17coresight: etm4x: Fix etm4_count race by moving cpuhp callbacks to initSai Prakash Ranjan1-34/+31
etm4_count keeps track of number of ETMv4 registered and on some systems, a race is observed on etm4_count variable which can lead to multiple calls to cpuhp_setup_state_nocalls_cpuslocked(). This function internally calls cpuhp_store_callbacks() which prevents multiple registrations of callbacks for a given state and due to this race, it returns -EBUSY leading to ETM probe failures like below. coresight-etm4x: probe of 7040000.etm failed with error -16 This race can easily be triggered with async probe by setting probe type as PROBE_PREFER_ASYNCHRONOUS and with ETM power management property "arm,coresight-loses-context-with-cpu". Prevent this race by moving cpuhp callbacks to etm driver init since the cpuhp callbacks doesn't have to depend on the etm4_count and can be once setup during driver init. Similarly we move cpu_pm notifier registration to driver init and completely remove etm4_count usage. Also now we can use non cpuslocked version of cpuhp callbacks with this movement. Fixes: 9b6a3f3633a5 ("coresight: etmv4: Fix CPU power management setup in probe() function") Fixes: 58eb457be028 ("hwtracing/coresight-etm4x: Convert to hotplug state machine") Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com> Tested-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200916191737.4001561-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-23treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva4-7/+4
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-07-21coresight: etm4x: Fix save/restore during cpu idleSuzuki K Poulose2-9/+9
The ETM state save/restore incorrectly reads/writes some of the 64bit registers (e.g, address comparators, vmid/cid comparators etc.) using 32bit accesses. Ensure we use the appropriate width accessors for the registers. Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states") Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-18-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: etm: perf: Add default sink selection to etm perfMike Leach1-3/+14
Add default sink selection to the perf trace handling in the etm driver. Uses the select default sink infrastructure to select a sink for the perf session, if no other sink is specified. Signed-off-by: Mike Leach <mike.leach@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-17-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: tmc: Update sink types for default selectionMike Leach1-1/+2
An additional sink subtype is added to differentiate ETB/ETF buffer sinks and ETR type system memory sinks. This allows the prioritised selection of default sinks. Signed-off-by: Mike Leach <mike.leach@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-16-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: Add default sink selection to CoreSight baseMike Leach2-0/+168
Adds a method to select a suitable sink connected to a given source. In cases where no sink is defined, the coresight_find_default_sink routine can search from a given source, through the child connections until a suitable sink is found. The suitability is defined in by the sink coresight_dev_subtype on the CoreSight device, and the distance from the source by counting connections. Higher value subtype is preferred - where these are equal, shorter distance from source is used as a tie-break. This allows for default sink to be discovered were none is specified (e.g. perf command line) Signed-off-by: Mike Leach <mike.leach@linaro.org> Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Leo Yan <leo.yan@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-15-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: tmc: Fix TMC mode read in tmc_read_unprepare_etb()Sai Prakash Ranjan1-7/+6
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@linaro.org> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Tested-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-14-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: tmc: Add shutdown callback for TMC ETRSai Prakash Ranjan3-1/+25
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@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-13-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: etmv4: Counter values not saved on disableMike Leach1-0/+6
The counter value registers change during operation, however this change is not reflected in the values seen by the user in sysfs. This fixes the issue by reading back the values on disable. Signed-off-by: Mike Leach <mike.leach@linaro.org> Fixes: 2e1cdfe184b52 ("coresight-etm4x: Adding CoreSight ETM4x driver") Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-11-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: etmv4: Fix resource selector constantMike Leach1-2/+2
ETMv4 max resource selector constant incorrectly set to 16. Updated to the correct 32 value, and adjustments made to limited code using it. Signed-off-by: Mike Leach <mike.leach@linaro.org> Fixes: 2e1cdfe184b52 ("coresight-etm4x: Adding CoreSight ETM4x driver") Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-10-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: Drop double check for ACPI companion deviceAndy Shevchenko1-2/+0
acpi_dev_get_resources() does perform the NULL pointer check against ACPI companion device which is given as function parameter. Thus, there is no need to duplicate this check in the caller. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-9-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: Use devm_kcalloc() in coresight_alloc_conns()Xu Wang1-3/+2
A multiplication for the size determination of a memory allocation indicated that an array data structure should be processed. Thus use the corresponding function "devm_kcalloc". Signed-off-by: Xu Wang <vulab@iscas.ac.cn> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-8-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: replicator: Reset replicator if context is lostSai Prakash Ranjan1-17/+38
On some QCOM SoCs, replicators in Always-On domain loses its context as soon as the clock is disabled. Currently as a part of pm_runtime workqueue, clock is disabled after the replicator is initialized by amba_pm_runtime_suspend assuming that context is not lost which is not true for replicators with such limitations. So add a new property "qcom,replicator-loses-context" to identify such replicators and reset them. Suggested-by: Mike Leach <mike.leach@linaro.org> Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-6-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: etm4x: Add support to skip trace unit power upTingwei Zhang2-10/+20
On some Qualcomm Technologies Inc. SoCs like SC7180, there exists a hardware errata where the APSS (Application Processor SubSystem)/CPU watchdog counter is stopped when the trace unit power up ETM register is set (TRCPDCR.PU = 1). Since the ETMs share the same power domain as that of respective CPU cores, they are powered on when the CPU core is powered on. So we can skip powering up of trace unit after checking for this errata via new property called "qcom,skip-power-up". Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Co-developed-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-4-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: catu: Use CS_AMBA_ID macro for id tableSai Prakash Ranjan1-4/+1
Use CS_AMBA_ID macro for coresight catu AMBA id table instead of open coding. Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-3-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-21coresight: replicator: Use CS_AMBA_ID macro for id tableSai Prakash Ranjan1-10/+3
Use CS_AMBA_ID macro for dynamic replicator AMBA id table instead of open coding. Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-10intel_th: Fix a NULL dereference when hub driver is not loadedAlexander Shishkin2-6/+19
Connecting master to an output port when GTH driver module is not loaded triggers a NULL dereference: > RIP: 0010:intel_th_set_output+0x35/0x70 [intel_th] > Call Trace: > ? sth_stm_link+0x12/0x20 [intel_th_sth] > stm_source_link_store+0x164/0x270 [stm_core] > dev_attr_store+0x17/0x30 > sysfs_kf_write+0x3e/0x50 > kernfs_fop_write+0xda/0x1b0 > __vfs_write+0x1b/0x40 > vfs_write+0xb9/0x1a0 > ksys_write+0x67/0xe0 > __x64_sys_write+0x1a/0x20 > do_syscall_64+0x57/0x1d0 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 Make sure the module in question is loaded and return an error if not. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Fixes: 39f4034693b7c ("intel_th: Add driver infrastructure for Intel(R) Trace Hub devices") Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reported-by: Ammy Yi <ammy.yi@intel.com> Tested-by: Ammy Yi <ammy.yi@intel.com> Cc: stable@vger.kernel.org # v4.4 Link: https://lore.kernel.org/r/20200706161339.55468-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-10intel_th: pci: Add Emmitsburg PCH supportAlexander Shishkin1-0/+5
This adds support for the Trace Hub in Emmitsburg PCH. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org # v4.14+ Link: https://lore.kernel.org/r/20200706161339.55468-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-10intel_th: pci: Add Tiger Lake PCH-H supportAlexander Shishkin1-0/+5
This adds support for the Trace Hub in Tiger Lake PCH-H. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org # v4.14+ Link: https://lore.kernel.org/r/20200706161339.55468-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-10intel_th: pci: Add Jasper Lake CPU supportAlexander Shishkin1-0/+5
This adds support for the Trace Hub in Jasper Lake CPU. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org # v4.14+ Link: https://lore.kernel.org/r/20200706161339.55468-2-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-01coresight: etmv4: Fix CPU power management setup in probe() functionMike Leach1-29/+53
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 ("hwtracing/coresight-etm4x: Convert to hotplug state machine") Signed-off-by: Mike Leach <mike.leach@linaro.org> Cc: stable <stable@vger.kernel.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200701160852.2782823-3-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-01coresight: cti: Fix error handling in probeDan Carpenter1-42/+54
There were a couple problems with error handling in the probe function: 1) If the "drvdata" allocation failed then it lead to a NULL dereference. 2) On several error paths we decremented "nr_cti_cpu" before it was incremented which lead to a reference counting bug. There were also some parts of the error handling which were not bugs but were messy. The error handling was confusing to read. It printed some unnecessary error messages. The simplest way to fix these problems was to create a cti_pm_setup() function that did all the power management setup in one go. That way when we call cti_pm_release() we don't have to deal with the complications of a partially configured power management config. I reversed the "if (drvdata->ctidev.cpu >= 0)" condition in cti_pm_release() so that it mirros the new cti_pm_setup() function. Fixes: 6a0953ce7de9 ("coresight: cti: Add CPU idle pm notifer to CTI devices") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Mike Leach <mike.leach@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200701160852.2782823-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-06-15stm class: Replace zero-length array with flexible-arrayGustavo A. R. Silva2-3/+3
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://github.com/KSPP/linux/issues/21 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-06-07Merge tag 'char-misc-5.8-rc1' of ↵Linus Torvalds15-106/+619
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc driver updates from Greg KH: "Here is the large set of char/misc driver patches for 5.8-rc1 Included in here are: - habanalabs driver updates, loads - mhi bus driver updates - extcon driver updates - clk driver updates (approved by the clock maintainer) - firmware driver updates - fpga driver updates - gnss driver updates - coresight driver updates - interconnect driver updates - parport driver updates (it's still alive!) - nvmem driver updates - soundwire driver updates - visorbus driver updates - w1 driver updates - various misc driver updates In short, loads of different driver subsystem updates along with the drivers as well. All have been in linux-next for a while with no reported issues" * tag 'char-misc-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (233 commits) habanalabs: correctly cast u64 to void* habanalabs: initialize variable to default value extcon: arizona: Fix runtime PM imbalance on error extcon: max14577: Add proper dt-compatible strings extcon: adc-jack: Fix an error handling path in 'adc_jack_probe()' extcon: remove redundant assignment to variable idx w1: omap-hdq: print dev_err if irq flags are not cleared w1: omap-hdq: fix interrupt handling which did show spurious timeouts w1: omap-hdq: fix return value to be -1 if there is a timeout w1: omap-hdq: cleanup to add missing newline for some dev_dbg /dev/mem: Revoke mappings when a driver claims the region misc: xilinx-sdfec: convert get_user_pages() --> pin_user_pages() misc: xilinx-sdfec: cleanup return value in xsdfec_table_write() misc: xilinx-sdfec: improve get_user_pages_fast() error handling nvmem: qfprom: remove incorrect write support habanalabs: handle MMU cache invalidation timeout habanalabs: don't allow hard reset with open processes habanalabs: GAUDI does not support soft-reset habanalabs: add print for soft reset due to event habanalabs: improve MMU cache invalidation code ...
2020-06-01Merge tag 'docs-5.8' of git://git.lwn.net/linuxLinus Torvalds1-1/+1
Pull documentation updates from Jonathan Corbet: "A fair amount of stuff this time around, dominated by yet another massive set from Mauro toward the completion of the RST conversion. I *really* hope we are getting close to the end of this. Meanwhile, those patches reach pretty far afield to update document references around the tree; there should be no actual code changes there. There will be, alas, more of the usual trivial merge conflicts. Beyond that we have more translations, improvements to the sphinx scripting, a number of additions to the sysctl documentation, and lots of fixes" * tag 'docs-5.8' of git://git.lwn.net/linux: (130 commits) Documentation: fixes to the maintainer-entry-profile template zswap: docs/vm: Fix typo accept_threshold_percent in zswap.rst tracing: Fix events.rst section numbering docs: acpi: fix old http link and improve document format docs: filesystems: add info about efivars content Documentation: LSM: Correct the basic LSM description mailmap: change email for Ricardo Ribalda docs: sysctl/kernel: document unaligned controls Documentation: admin-guide: update bug-hunting.rst docs: sysctl/kernel: document ngroups_max nvdimm: fixes to maintainter-entry-profile Documentation/features: Correct RISC-V kprobes support entry Documentation/features: Refresh the arch support status files Revert "docs: sysctl/kernel: document ngroups_max" docs: move locking-specific documents to locking/ docs: move digsig docs to the security book docs: move the kref doc into the core-api book docs: add IRQ documentation at the core-api book docs: debugging-via-ohci1394.txt: add it to the core-api book docs: fix references for ipmi.rst file ...
2020-05-19coresight: cti: Add CPU idle pm notifer to CTI devicesMike Leach1-0/+69
Adds a notify callback for CPU PM events to the CTI driver - for CPU bound CTI devices. Signed-off-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-24-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-19coresight: cti: Add CPU Hotplug handling to CTI driverMike Leach1-0/+92
Adds registration of CPU start and stop functions to CPU hotplug mechanisms - for any CPU bound CTI. Sets CTI powered flag according to state. Will enable CTI on CPU start if there are existing enable requests. Signed-off-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-23-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-19coresight: etm4x: Fix use-after-free of per-cpu etm drvdataSuzuki K Poulose1-0/+1
etm probe could be deferred due to the dependency in the trace path chain and may be retried. We need to clear the per-cpu etmdrvdata entry for the etm in case of a failure to avoid use-after-free cases as reported below: KASAN use-after-free bug in etm4_cpu_pm_notify(): [ 8.574566] coresight etm0: CPU0: ETM v4.2 initialized [ 8.581920] BUG: KASAN: use-after-free in etm4_cpu_pm_notify+0x580/0x2024 [ 8.581925] Read of size 8 at addr ffffff813304f8c8 by task swapper/3/0 [ 8.581927] [ 8.581934] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G S W 5.4.28 #314 [ 8.587775] coresight etm1: CPU1: ETM v4.2 initialized [ 8.594195] Call trace: [ 8.594205] dump_backtrace+0x0/0x188 [ 8.594209] show_stack+0x20/0x2c [ 8.594216] dump_stack+0xdc/0x144 [ 8.594227] print_address_description+0x3c/0x494 [ 8.594232] __kasan_report+0x144/0x168 [ 8.601598] coresight etm2: CPU2: ETM v4.2 initialized [ 8.602563] kasan_report+0x10/0x18 [ 8.602568] check_memory_region+0x1a4/0x1b4 [ 8.602572] __kasan_check_read+0x18/0x24 [ 8.602577] etm4_cpu_pm_notify+0x580/0x2024 [ 8.665945] notifier_call_chain+0x5c/0x90 [ 8.670166] __atomic_notifier_call_chain+0x90/0xf8 [ 8.675182] cpu_pm_notify+0x40/0x6c [ 8.678858] cpu_pm_enter+0x38/0x80 [ 8.682451] psci_enter_idle_state+0x34/0x70 [ 8.686844] cpuidle_enter_state+0xb8/0x20c [ 8.691143] cpuidle_enter+0x38/0x4c [ 8.694820] call_cpuidle+0x3c/0x68 [ 8.698408] do_idle+0x1a0/0x280 [ 8.701729] cpu_startup_entry+0x24/0x28 [ 8.705768] secondary_start_kernel+0x15c/0x170 [ 8.710423] [ 8.711972] Allocated by task 242: [ 8.715473] __kasan_kmalloc+0xf0/0x1ac [ 8.719426] kasan_slab_alloc+0x14/0x1c [ 8.723375] __kmalloc_track_caller+0x23c/0x388 [ 8.728040] devm_kmalloc+0x38/0x94 [ 8.731632] etm4_probe+0x48/0x3c8 [ 8.735140] amba_probe+0xbc/0x158 [ 8.738645] really_probe+0x144/0x408 [ 8.742412] driver_probe_device+0x70/0x140 [ 8.746716] __device_attach_driver+0x9c/0x110 [ 8.751287] bus_for_each_drv+0x90/0xd8 [ 8.755236] __device_attach+0xb4/0x164 [ 8.759188] device_initial_probe+0x20/0x2c [ 8.763490] bus_probe_device+0x34/0x94 [ 8.767436] device_add+0x34c/0x3e0 [ 8.771029] amba_device_try_add+0x68/0x440 [ 8.775332] amba_deferred_retry_func+0x48/0xc8 [ 8.779997] process_one_work+0x344/0x648 [ 8.784127] worker_thread+0x2ac/0x47c [ 8.787987] kthread+0x128/0x138 [ 8.791313] ret_from_fork+0x10/0x18 [ 8.794993] [ 8.796532] Freed by task 242: [ 8.799684] __kasan_slab_free+0x15c/0x22c [ 8.803897] kasan_slab_free+0x10/0x1c [ 8.807761] kfree+0x25c/0x4bc [ 8.810913] release_nodes+0x240/0x2b0 [ 8.814767] devres_release_all+0x3c/0x54 [ 8.818887] really_probe+0x178/0x408 [ 8.822661] driver_probe_device+0x70/0x140 [ 8.826963] __device_attach_driver+0x9c/0x110 [ 8.831539] bus_for_each_drv+0x90/0xd8 [ 8.835487] __device_attach+0xb4/0x164 [ 8.839431] device_initial_probe+0x20/0x2c [ 8.843732] bus_probe_device+0x34/0x94 [ 8.847678] device_add+0x34c/0x3e0 [ 8.851274] amba_device_try_add+0x68/0x440 [ 8.855576] amba_deferred_retry_func+0x48/0xc8 [ 8.860240] process_one_work+0x344/0x648 [ 8.864366] worker_thread+0x2ac/0x47c [ 8.868228] kthread+0x128/0x138 [ 8.871557] ret_from_fork+0x10/0x18 [ 8.875231] [ 8.876782] The buggy address belongs to the object at ffffff813304f800 [ 8.876782] which belongs to the cache kmalloc-1k of size 1024 [ 8.889632] The buggy address is located 200 bytes inside of [ 8.889632] 1024-byte region [ffffff813304f800, ffffff813304fc00) [ 8.901761] The buggy address belongs to the page: [ 8.906695] page:ffffffff04ac1200 refcount:1 mapcount:0 mapping:ffffff8146c03800 index:0x0 compound_mapcount: 0 [ 8.917047] flags: 0x4000000000010200(slab|head) [ 8.921799] raw: 4000000000010200 dead000000000100 dead000000000122 ffffff8146c03800 [ 8.929753] raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 [ 8.937703] page dumped because: kasan: bad access detected [ 8.943433] [ 8.944974] Memory state around the buggy address: [ 8.949903] ffffff813304f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 8.957320] ffffff813304f800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 8.964742] >ffffff813304f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 8.972157] ^ [ 8.977886] ffffff813304f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 8.985298] ffffff813304f980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 8.992713] ================================================================== Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states") Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-22-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-19coresight: Avoid casting void pointersStephen Boyd1-3/+6
We don't need to cast void pointers, such as the amba_id data. Assign to a local variable to make the code prettier and also return NULL instead of 0 to make sparse happy. Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Reviewed-by: Joe Perches <joe@perches.com> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-21-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-19coresight: Include required headers in C filesStephen Boyd4-2/+33
We should include headers that C files use in the C files that use them and avoid relying on implicit includes as much as possible. This helps avoid compiler errors in the future about missing declarations when header files change includes in the future. Cc: Douglas Anderson <dianders@chromium.org> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-20-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-19coresight: Initialize arg in sparse friendly wayStephen Boyd2-2/+2
Sparse gets annoyed when this initializer is 0 but the first struct member is a pointer. Just use { } to initialize instead so that sparse is quiet. Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-19-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-19coresight: Don't initialize variables unnecessarilyStephen Boyd1-4/+4
These variables are assigned again before they're used. Leave them unassigned at first so that the compiler can detect problems in the future with use before initialization. Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-18-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-19coresight: Mark some functions staticStephen Boyd4-6/+5
These functions aren't used outside the file they're in. Mark them static to indicate as such and silence tools like sparse. Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> [Dropped changes in coresight-cti.c and coresight-etb10.c] Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200518180242.7916-17-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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