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https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
# Conflicts:
# MAINTAINERS
# drivers/android/binder/thread.rs
# drivers/android/binder_alloc.c
# drivers/android/binderfs.c
# rust/kernel/miscdevice.rs
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git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull hardening updates from Kees Cook:
- Provide kmalloc_obj*-style API for devm_kmalloc()
- Improve seq_buf API for saner C String handling with several bug
fixes along the way (Kees Cook, Bill Wendling)
- Overflow helper readability improvements (Bill Wendling)
- Unexport native_write_cr4() (Dennis Chen)
- um: fix CONFIG_GCOV for built-in code (Johannes Berg)
- Improve stackinit test coverage (Justin Stitt)
- KMSAN: fix memset() when using fortify-source, again (Arnd Bergmann)
- lkdtm: use kmalloc() instead of __get_free_page (Mahad Ibrahim)
- signalfd: don't dequeue the forced fatal signals (Oleg Nesterov)
- Fix randstruct to recognize new container_of() behavior
- coccinelle: kmalloc_obj: Convert multi-byte integral allocations too
- Fix a couple remaining allocation return type mismatches
* tag 'hardening-v7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (29 commits)
overflow: Match arithmetic in both parts of __builtin_choose_expr
lkdtm: Make UNSET_SMEP built-in-only and unexport native_write_cr4()
extcon: realtek: Remove const from type_c_cfg allocation type
coresight: cti: Add const to con_groups allocation type
docs: core-api: Document the seq_buf API
nvdimm: ndtest: Return the string length from flags_show()
powerpc/papr_scm: Return the string length from the sysfs show functions
seq_buf: Add seq_buf_init_append()
bpf: Remove dead newline stripping from format_disasm_line()
seq_buf: Add seq_buf_terminate()
seq_buf: Add seq_buf_strlen()
seq_buf: Clear what a writer did not claim when a seq_buf overflows
seq_buf: Copy what fits when seq_buf_puts() and seq_buf_putmem() overflow
scsi: lpfc: Print rx monitor records straight into the seq_buf
seq_buf: Do not pop from an overflowed seq_buf
seq_buf: Do not print an empty line from an overflowed seq_buf_do_printk()
.get_maintainer.ignore: Add Kees Cook
devres: Provide kmalloc_obj*-style API for devm_kmalloc
mm: Move default_gfp() into gfp_types.h
kunit/stackinit: Clean up XFAIL under instrumentation
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In preparation for making the devm_kmalloc family of allocators type
aware, we need to make sure that the returned type from the allocation
matches the type of the variable being assigned. (Before, the allocator
would always return "void *", which can be implicitly cast to any
pointer type.)
The assigned type is "const struct attribute_group **", but the
converted allocation type would be "struct attribute_group **", which is
the same type without the const qualifier. As there is no general way to
safely add const qualifiers, take the size from the assignment target
instead. No change in allocation size results.
Build tested ARCH=arm64 allmodconfig with GCC aarch64-linux-gnu 16.1.0:
drivers/hwtracing/coresight/coresight-cti-sysfs.o
Assisted-by: LLM coccinelle
Reviewed-by: Mike Leach <mike.leach@arm.com>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Link: https://patch.msgid.link/20260917211428.i.947-kees@kernel.org
Signed-off-by: Kees Cook <kees+treewide@kernel.org>
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Static 'struct amba_id' table is not modified so can be changed to const
for more safety.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260705171934.116425-2-krzysztof.kozlowski@oss.qualcomm.com
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PERF_RECORD_ITRACE_START establishes the initial thread context at the
beginning of a trace. Afterwards, decoders track the thread context using
context packets.
Call perf_event_itrace_started() after successfully starting the event
to prevent perf core from emitting redundant PERF_RECORD_ITRACE_START
records when the event is scheduled in again.
When per-thread mode traces multiple child threads, tooling should
enable context ID tracing instead to identify each thread.
Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
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drvdata->config is used only by the sysfs interface.
Rename it to sysfs_config to clarify its purpose.
For readability, also rename local config variables to sysfs_config
where they refer to drvdata->sysfs_config.
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-14-5d8a29aead95@arm.com
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drvdata->curr_config
For readability, rename the local config variable to curr_config in
places where it refers to drvdata->curr_config.
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-13-5d8a29aead95@arm.com
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Introduce struct etm_caps to describe ETMv3 capabilities
and move capabilities information into it.
Since drvdata->etmccr and drvdata->etmccer are used to check
whether it supports fifofull logic and timestamping,
remove etmccr and etmccer field from drvdata and add relevant fields
in etm_caps structure.
Reviewed-by: Mike Leach <mike.leach@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-12-5d8a29aead95@arm.com
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drvdata->config is used only by the sysfs interface.
Rename it to sysfs_config to clarify its purpose.
For readability, also rename local config variables to sysfs_config
where they refer to drvdata->sysfs_config.
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-11-5d8a29aead95@arm.com
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drvdata->curr_config
For readability, rename the local config variable to curr_config in
places where it refers to drvdata->curr_config.
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-10-5d8a29aead95@arm.com
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s_ex_level is a hardware capability rather than a configurable parameter.
As such, it should not be stored in the configuration structure.
Remove s_ex_level from the config structure and pass etm4_caps to the
functions that need to access this capability.
Reviewed-by: Mike Leach <mike.leach@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-9-5d8a29aead95@arm.com
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The purpose of TRCSSCSRn register is to show status of
the corresponding Single-shot Comparator Control and input supports.
That means writable field's purpose for reset or restore from idle status
not for configuration.
Therefore, exclude ss_status from drvdata->config and move it to drvdata.
Before this patch, clearing the PENDING and STATUS bits when enabling
a perf session could trigger multiple single-shot events within
the same session. This issue will be addressed in a future patch;
this patch intentionally preserves the existing behavior.
Reviewed-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Mike Leach <mike.leach@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-8-5d8a29aead95@arm.com
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Introduce struct etm4_caps to describe ETMv4 capabilities
and move capabilities information into it.
Reviewed-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Mike LEach <mike.leach@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-7-5d8a29aead95@arm.com
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cpu online() check is done in coresight_validate_source_sysfs() already.
and smp_call_function_single() will fail when cpu is offline.
Therefore, remove redundant check in etm_enable_sysfs().
Reviewed-by: Mike Leach <mike.leach@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-6-5d8a29aead95@arm.com
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The current ETM3x configuration via sysfs can lead to the following
inconsistencies:
- If a configuration is modified via sysfs while a perf session is
active, the running configuration may differ between before
a sched-out and after a subsequent sched-in.
To resolve these issues, separate the configuration into:
- curr_config: the configuration applied to the current session
- config: the configuration set via sysfs
Additionally:
- Since curr_config and related fields are accessed only by the local CPU
in etm_enable/disable_sysfs_smp_call() (similar to perf enable/disable),
remove the lock/unlock from the sysfs enable/disable path and
starting/dying_cpu path except when to access config fields only.
- Some of sysfs interface read etm register directly. To reduce lock
scope while the etm_enable_hw()/etm_disable_hw(), handle it via
IPI so that registers could be read from on proper CPU.
Fixes: 1925a470ce69 ("coresight: etm3x: splitting struct etm_drvdata")
Tested-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-5-5d8a29aead95@arm.com
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The current ETM4x configuration via sysfs can lead to
several inconsistencies:
- If the configuration is modified via sysfs while a perf session is
active, the running configuration may differ before a sched-out and
after a subsequent sched-in.
- If a perf session and a sysfs session enable tracing concurrently,
the configuration from configfs may become corrupted.
- There is a risk of corrupting drvdata->config if a perf session enables
tracing while cscfg_csdev_disable_active_config() is being handled in
etm4_disable_sysfs().
To resolve these issues, separate the configuration into:
- curr_config: the configuration applied to the current session
- config: the configuration set via sysfs
Additionally:
- Apply the configuration from configfs after taking the appropriate
mode.
- Since curr_config and related fields are accessed only by the local CPU
in etm4_enable/disable_sysfs_smp_call() (similar to perf enable/disable),
remove the lock/unlock from the sysfs enable/disable path and
startup/dying_cpu except when to access config fields.
As the curr_config is used for cfg-configfs, etmv4 doesn't need to set
its lock for the cfg-configfs since the curr_config is proceted by cs_mode
otherwise it would make a possible cpu-stall when it get interrupt while
setting the sysfs configuration.
Therefore, set the drv_spinlock for cfg-configfs as NULL and
let the cfg-configfs disable irq without grap drv_spinlock when it is NULL.
Fixes: 54ff892b76c6 ("coresight: etm4x: splitting struct etmv4_drvdata")
Tested-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-4-5d8a29aead95@arm.com
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cntr_val are overwritten with the values read from the corresponding
registers by etm_disable_hw() when the session is disabled.
This means that any changes to this value made while the session is
enabled would be lost when the session is disabled.
Also, reset shouldn't be called while session is enabled.
Therefore, prohibit modifying cntr_val and reset while the session is
enabled.
Reviewed-by: Mike Leach <mike.leach@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-3-5d8a29aead95@arm.com
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cntr_val is overwritten with the values read from the corresponding
registers by etm4_disable_hw() when the session is disabled.
This means that any changes to these values made while the session is
enabled would be lost when the session is disabled.
Therefore, prohibit modifying cntr_val while the session is enabled.
Tested-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-2-5d8a29aead95@arm.com
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TRCSEQSTR can be changed by the ETM while a session is active. Its value
therefore needs to be preserved when a sysfs session is disabled so that
users can read the current sequence state after the session ends.
This means that any changes made to TRCSEQSTR while the sysfs-session is
active would be lost when the session is disabled.
Copy the TRCSEQSTR value when disabling a sysfs session, and prohibit
modifying seq_state while the session is active.
Suggested-by: Mike Leach <mike.leach@arm.com>
Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20261003-separate_etm_cfg_v2-v13-1-5d8a29aead95@arm.com
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TRBE doesn't support sysfs mode, but the enable_sink file can still be
successfully written to enable the device, and only attempting to enable
the source would later fail.
Avoid misleading users by adding a flag that devices can use to hide
either the enable_sink or enable_source files, and set it for TRBE.
Don't set it for ETE as it's possible that ETE could appear on the
legacy bus and work with sysfs, and writing to enable_source already
reports EINVAL if the device doesn't support sysfs mode.
Signed-off-by: James Clark <james.clark@linaro.org>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260807-james-cs-hide-trbe-enable-v2-1-0b2af223feed@linaro.org
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This is another run of the Coccinelle script for converting kmalloc()
family of allocations to kmalloc_obj() via the existing rules in
scripts/coccinelle/api/kmalloc_objs.cocci
This catches both the set of kmalloc() uses added since the first
kmalloc_obj() conversions in v7.0 and adds a large group missed in the
first pass due to Coccinelle not interacting well with the cleanup.h
scoped_...() family of macros[1]. I worked around this with spatch's
"--macro-file" argument to a file with all the scoped_...() macros mapped
to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control
flow indicator I could find.
Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc,
riscv, and s390 with no new warnings.
Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1]
Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2]
Signed-off-by: Kees Cook <kees+treewide@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc/IIO/etc driver updates from Greg KH:
"Here is the big set of char, misc, iio, counter, fpga, and other small
driver subsystems for 7.3-rc1.
Overall, due to some driver removals we only added a bit more code
than removed, which was a nice change. Highlights in this merge
request are:
- Loads of IIO driver updates and additions
- binder driver updates (more on that below...)
- Removal of the SGI XP and GRU drivers as they are not used anymore
and turn out to be pretty insecure overall
- Removal of the obsolete ibmasm driver as it's not being used
anymore
- Coresight driver updates and additions
- Mei driver udpates
- Counter driver updates
- FPGA driver updates
- ICC driver updates
- lots and lots of other tiny driver updates to resolve reported
issues
All of these have been in linux-next for a while"
* tag 'char-misc-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (513 commits)
iio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF
iio: adc: pac1921: fix wrong channel used in trigger handler read
iio: light: gp2ap002: re-enable irq if runtime suspend fails
iio: light: gp2ap002: Fix unbalanced runtime PM on repeated event writes
iio: light: apds9306: fix PM reference leak in apds9306_read_data()
iio: gyro: mpu3050: fix sign of raw angular velocity readings
iio: srf04: fix pm_runtime handling on probe error path
iio: adc: ad4080: configure backend data size
iio: adc: adi-axi-adc: add data size support for AD408X backend
iio: chemical: atlas-sensor: fix PM reference leak in buffer postenable
iio: dac: ad5446: fix OF module device table
iio: light: opt4001: Fix reversed GENMASK() arguments in fault count mask
iio: light: opt4001: Reject integration times with a non-zero seconds part
iio: light: opt4001: Fix incompatible pointer type passed to div_u64_rem()
iio: light: opt4001: Fix power down clearing bits of the wrong register
iio: light: opt4060: Fix incorrect register name in threshold read error message
iio: light: opt4060: Fix pointer type passed to div_u64_rem()
iio: light: opt4060: Reject integration times with a non-zero seconds part
iio: light: ltrf216a: fix runtime PM reference leak in error path
iio: pressure: dps310: fix NULL pointer dereference on ACPI probe
...
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Pull bitmap updates from Yury Norov:
"The usual set of fixes, cleanups and performance improvements together
with a couple of new tests:
- bitmap_find_next_zero_area_off() optimization (Sunyi)
- bitmap_find_next_zero_area_off(): return size when no zero area is
found (Yury)
- bitmap vs IDA vs Maple Tree performance test (Yury)
- get rid of cpumap_print_to_pagebuf() (Yury)
- use nr_node_ids in __nodemask_pr_numnodes() (Li RongQing)
- bitops: make the *_bit_le functions use unsigned long (Benjamin)
- bitmap scatter & gather test fix (Christophe)
- use __ASSEMBLER__ in bitmap header files (Thomas)"
* tag 'bitmap-for-7.3' of https://github.com/norov/linux: (25 commits)
lib: test bitmap vs IDA vs Maple Tree performance for region allocations
bitmap: Return size when no zero area is found
media: s5p-mfc: Treat bitmap size as allocation failure
crypto: ccp: Treat bitmap size as allocation failure
powerpc/msi: Treat bitmap size as allocation failure
ARM: dma-mapping: Treat bitmap size as allocation failure
bitmap: drop bitmap_next_set_region()
nodemask: reduce bitmap width to nr_node_ids in __nodemask_pr_numnodes()
bitmap: Properly initialise destination bitmap for scatter & gather test
lib/bitmap-str: get rid of cpumap_print_to_pagebuf()
perf: Use sysfs_emit() for cpumask show callbacks
PCI/sysfs: Use sysfs_emit() for cpumask show callbacks
RDMA/hfi1: Use sysfs_emit() for cpumask show helper
hwtracing: hisi_ptt: Use sysfs_emit() for cpumask show
fpga: dfl-fme-perf: Use sysfs_emit() for cpumask show
devfreq: Use sysfs_emit() for cpumask show callbacks
cpu: Use sysfs_emit() for cpumask show callback
x86/events: Use sysfs_emit() for cpumask show callbacks
powerpc: Use sysfs_emit() for cpumask show callbacks
arm: Use sysfs_emit() for cpumask show callbacks
...
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ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/coresight/linux into char-misc-next
Suzuki writes:
coresight: Updates for Linux v7.3
This is relatively smaller update for CoreSight/hwtracing subsystem updates.
- MAINTAINERS update for HiSilicon PCI Trace & Tune drivers
- Minor fixes to hisi_ptt driver
- Various fixes to the coresight etm4x dirvers
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
* tag 'coresight-next-v7.3' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/coresight/linux:
coresight: etm4x: remove redundant fields in etmv4_save_state
coresight: etm4x: missing cscfg_csdev_disable_active_config() in perf enable
coresight: etm4x: fix leaked trace id
coresight: etm4x: fix underflow for usage of (nrseqstate - 1)
coresight: etm4x: fix wrong check of etm4x_sspcicrn_present()
hwtracing: hisi_ptt: Remove unnecessary trace buffer zeroing in trace_start()
hwtracing: hisi_ptt: Propagate DMA reset timeout in trace_start()
MAINTAINERS: Update HiSilicon PCI Trace and Tune maintainer
coresight: etm3x: Fix cntr_val_show() to match cntr_val_store() behavior
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Some of fields are redundant in etmv4_save_state and never used:
ss_status => trcsscsr
seq_state => trcseqstr
cntr_val => trccntvr
vinst_ctrl => trcvictlr
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260725113645.57519-13-yeoreum.yun@arm.com
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In the perf enable path, there are missing cases where
cscfg_csdev_disable_active_config() is not called:
- Branch broadcast is selected but not supported by the hardware
- etm4_enable_hw() fails
This can lead to a leak of config_desc->active_cnt.
Fix this by properly calling cscfg_csdev_disable_active_config()
in these error paths.
Fixes: 810ac401db1f ("coresight: etm4x: Add complex configuration handlers to etmv4")
Suggested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260725113645.57519-6-yeoreum.yun@arm.com
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If etm4_enable_sysfs() fails in cscfg_csdev_enable_active_config(),
the trace ID may be leaked because it is not released.
To address this, call etm4_release_trace_id() when etm4_enable_sysfs()
fails in cscfg_csdev_enable_active_config().
Fixes: 7ebd0ec6cf94 ("coresight: configfs: Allow configfs to activate configuration")
Reviewed-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260725113645.57519-4-yeoreum.yun@arm.com
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According to IHI006H Embedded Trace Macrocell Architecture
Specification[0], TRCSEQEVR<n> is implemented only when
TRCIDR5.NUMSEQSTATE is 0b100, in which case n ranges from 0 to 2;
otherwise, TRCIDR5.NUMSEQSTATE is 0b000.
IOW, the number of usage in the initialisation or setting
TRCSEQEVR<n> with drvdata->nrseqstate - 1 in the loop could make
underflow issue when TRCIDR5.NUMSEQSTATE is 0b000.
Therefore, introduce nr_seq_ctrls field and untie it from nrseqstate.
As part of this introduce ETM_MAX_SEQ_TRANSITIONS macro and
apply nr_seq_ctrls and above macro to TRCSEQEVR<n> relevant fields setup.
Link: https://developer.arm.com/documentation/ihi0064/latest/ [0]
Fixes: 2e1cdfe184b5 ("coresight-etm4x: Adding CoreSight ETM4x driver")
Suggested-by: Leo Yan <leo.yan@arm.com>
Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260725113645.57519-3-yeoreum.yun@arm.com
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According to Embedded Trace Macrocell Architecture Specification
ETMv4.0 to ETM4.6 [0], TRCSSPCICR<n> is present only if all of
the following are true:
- TRCIDR4.NUMSSCC > n.
- TRCIDR4.NUMPC > 0b0000.
- TRCSSCSR<n>.PC == 0b1.
Comment for etm4x_sspcicrn_present() is align with the specification.
However, the check should use drvdata->nr_pe_cmp to check TRCIDR4.NUMPC
not nr_pe.
Link: https://developer.arm.com/documentation/ihi0064/latest/ [0]
Fixes: f6a18f354c58 ("coresight: etm4x: Handle access to TRCSSPCICRn")
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260725113645.57519-2-yeoreum.yun@arm.com
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hisi_ptt_trace_start() clears all four trace buffers before enabling
tracing.
This is unnecessary. On trace stop, hisi_ptt_update_aux() copies only
the number of bytes reported in HISI_PTT_TRACE_WR_STS. On buffer-full
interrupts, it copies a full completed buffer. In both cases the driver
only consumes data written by hardware.
Remove the buffer clearing from the trace start path.
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
Reviewed-by: Yicong Yang <yangyccccc@gmail.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260414172451.14331-3-sanman.pradhan@hpe.com
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hisi_ptt_wait_dma_reset_done() discards the return value of
readl_poll_timeout_atomic(). If the DMA engine does not complete its
reset within the timeout, hisi_ptt_trace_start() proceeds to start
tracing regardless.
Return a bool from hisi_ptt_wait_dma_reset_done(), consistent with the
other wait helpers in this driver. On timeout, log an error, de-assert
the reset bit, and return -ETIMEDOUT. Move ctrl->started to the
successful path so a failed start does not leave the trace marked as
active.
Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device")
Cc: stable@vger.kernel.org
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
Reviewed-by: Sizhe Liu <liusizhe5@huawei.com>
Reviewed-by: Yicong Yang <yangyccccc@gmail.com>
Tested-by: Sizhe Liu <liusizhe5@huawei.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260414172451.14331-2-sanman.pradhan@hpe.com
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The cntr_val_show() function was intended to print the values of all
counters using a loop. However, due to a buffer overwrite issue with
sprintf(), it effectively only displayed the value of the last counter.
The companion function, cntr_val_store(), allows users to modify a
specific counter selected by 'cntr_idx'. To maintain consistency
between read and write operations and to align with the ETM4x driver
behavior, modify cntr_val_show() to report only the value of the
currently selected counter.
This change removes the loop and the "counter %d:" prefix, printing
only the hexadecimal value. It also adopts sysfs_emit() for standard
sysfs output formatting.
Fixes: a939fc5a71ad ("coresight-etm: add CoreSight ETM/PTM driver")
Cc: stable@vger.kernel.org
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20251202082613.3265761-1-visitorckw@gmail.com
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cpumask_show() is a sysfs show callback. Use sysfs_emit() and
cpumask_pr_args() to emit the mask.
This prepares for removing cpumap_print_to_pagebuf().
Signed-off-by: Yury Norov <ynorov@nvidia.com>
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intel_th_output_open() looks up the output device with
bus_find_device_by_devt(), which returns the device with a reference that
must be dropped after use.
commit 95fc36a234da ("intel_th: fix device leak on output open()")
attempted to drop the reference from intel_th_output_release(). However,
a successful open replaces file->f_op with the output driver file
operations before returning, so close runs the output driver release
callback instead.
For MSC outputs, close runs intel_th_msc_release(), which only removes
the per-file iterator and does not drop the device reference taken by
intel_th_output_open(). Consequently, every successful MSC output open
leaks one device reference.
Drop the device reference from intel_th_msc_release(), which is the
release path actually used for MSC output files. Remove the now-unused
intel_th_output_release() callback from intel_th_output_fops.
Fixes: 95fc36a234da ("intel_th: fix device leak on output open()")
Cc: stable <stable@kernel.org>
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260715070851.2077965-1-lgs201920130244@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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files)
Replace the #include of <linux/mod_devicetable.h> by the more specific
<linux/device-id/*.h> where applicable. For most cases the include
can be dropped completely, only a few drivers need one or two headers
added.
Acked-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/1a3f2007c5c5dcf555c09a4035ce3ae8ef1b6c49.1782808461.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull misc driver updates from Greg KH:
"Here is the big set of char, misc, iio, fpga, and other small driver
subsystems changes for 7.2-rc1.
Lots of little stuff in here, the majority being of course the IIO
driver updates, as a list they are:
- IIO driver updates and additions
- GPIB driver bugfixes and cleanups
- Android binder driver updates (rust and C version)
- counter driver updates
- MHI driver updates
- mei driver updates
- w1 driver updates
- interconnect driver updates
- Comedi driver fixes and updates
- some obsolete char drivers removed (applicom and dtlk)
- hwtracing driver updates
- other tiny driver updates
All of these have been in linux-next for a while with no reported
issues"
* tag 'char-misc-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (406 commits)
w1: ds2482: Use named initializers for arrays of i2c_device_data
firmware: stratix10-svc: Add support to query Arm Trusted Firmware (ATF) version
firmware: stratix10-rsu: avoid blocking reboot_image sysfs when busy
coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer()
iio: adc: nxp-sar-adc: harden buffer ISR against per-channel read failure
iio: chemical: scd30: Replace manual locking with RAII locking
iio: light: tsl2591: remove unneeded tsl2591_compatible_als_persist_cycle()
iio: dac: ad5686: create bus ops struct
iio: dac: ad5686: cleanup doc header of local structs
iio: dac: ad5686: add control_sync() for single-channel devices
iio: dac: ad5686: add helpers to handle powerdown masks
iio: dac: ad5686: add of_match table to the spi driver
iio: dac: ad5686: drop enum id
iio: dac: ad5686: remove redundant register definition
iio: dac: ad5686: refactor include headers
iio: adc: ad4080: fix AD4880 chip ID
iio: light: veml3328: add support for new device
dt-bindings: iio: light: veml6030: add veml3328
fpga: microchip-spi: fix zero header_size OOB read in mpf_ops_parse_header()
fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()
...
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Pass KBUILD_MODNAME through the driver registration macro so that the
driver core can create the module symlink in sysfs for built-in drivers,
and fixup all callers.
The Rust platform adapter is updated to pass the module name through to
the new parameter.
Tested on qemu with:
- x86 defconfig + CONFIG_RUST
- arm64 defconfig + CONFIG_RUST + CONFIG_CORESIGHT stuff
Examples after this patch:
/sys/bus/platform/drivers/...
coresight-itnoc/module -> coresight_tnoc
coresight-static-tpdm/module -> coresight_tpdm
coresight-catu-platform/module -> coresight_catu
serial8250/module -> 8250
acpi-ged/module -> acpi
vmclock/module -> ptp_vmclock
Co-developed-by: Rahul Bukte <rahul.bukte@sony.com>
Signed-off-by: Rahul Bukte <rahul.bukte@sony.com>
Signed-off-by: Shashank Balaji <shashank.mahadasyam@sony.com>
Link: https://patch.msgid.link/20260518-acpi_mod_name-v5-4-705ccc430885@sony.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
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Rename coresight_init_driver() to coresight_init_driver_with_owner() and
replace it with a macro wrapper that passes THIS_MODULE implicitly. This
is in line with what other buses do.
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Co-developed-by: Rahul Bukte <rahul.bukte@sony.com>
Signed-off-by: Rahul Bukte <rahul.bukte@sony.com>
Signed-off-by: Shashank Balaji <shashank.mahadasyam@sony.com>
Link: https://patch.msgid.link/20260518-acpi_mod_name-v5-3-705ccc430885@sony.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
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When the SMB sink is used as a perf AUX sink, smb_update_buffer() calls
smb_sync_perf_buffer() to copy hardware trace data into the perf AUX ring
buffer pages. It derives pg_idx = head >> PAGE_SHIFT from @head, which is
handle->head, and indexes dst_pages[pg_idx]. The pg_idx %= nr_pages
normalization is only applied after the first loop iteration.
This leaves the initial page index underived from the buffer size, which
can result in an out-of-bounds write past dst_pages[] when head exceeds
the AUX buffer size.
Normalize head modulo the AUX buffer size before deriving the page index
and offset, mirroring tmc_etr_sync_perf_buffer().
Fixes: 06f5c2926aaa ("drivers/coresight: Add UltraSoc System Memory Buffer driver")
Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/SYBPR01MB788156B3380A36835DB22290AF102@SYBPR01MB7881.ausprd01.prod.outlook.com
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The etb10 miscdevice uses drvdata->reading as a shared exclusivity gate
for userspace buffer access. etb_open() claims that gate with
local_cmpxchg(), and etb_release() clears it with local_set().
That gate is shared per-device state rather than CPU-local state. A
running system can reach it whenever /dev/<etb> is opened, closed, and
reopened by different tasks while the device remains registered, so the
same drvdata->reading variable may be claimed on one CPU and later
cleared on another.
This code used to use atomic_t for the same gate, but commit
27b10da8fff2 ("coresight: etb10: moving to local atomic operations")
changed it to local_t even though the access pattern remained cross-task
and cross-CPU. Restore atomic_t together with atomic_cmpxchg() and
atomic_set() so the exclusivity gate again uses a primitive intended
for shared state.
The issue was found on Linux v6.18.21 by our static analysis tool while
scanning surviving local_t-on-shared-state sites, and then manually
reviewed against the live etb10 file-op path.
It was runtime-validated with a reproducible QEMU no-device KCSAN PoC
that kept the same report-local contract:
1. use one shared struct etb_drvdata carrier and its
drvdata->reading gate;
2. call etb_open() and etb_release() sequentially on that gate to
confirm the original claim/clear path;
3. bind the open side to CPU0 and the release side to CPU1 for the
same gate to show cross-CPU ownership;
4. run bound workers that repeatedly race etb_open() and
etb_release() on the same gate until KCSAN reports a target hit.
The harness recorded:
L1 passed open=1 release=1
reading_after_open=1 reading_after_release=0
L2 passed open_cpu=0 release_cpu=1
cross_cpu_release=1 reading_after=0 open_ret=0
Representative KCSAN excerpt from the no-device validation run:
BUG: KCSAN: data-race in etb_open.constprop.0.isra.0 [vuln_msv]
write to 0xffffffffc0003810 of 4 bytes by task 216 on cpu 1:
etb_open.constprop.0.isra.0+0x38/0x80 [vuln_msv]
l3_worker_thread_fn+0x4f/0xf0 [vuln_msv]
kthread+0x17e/0x1c0
ret_from_fork+0x22/0x30
read to 0xffffffffc0003810 of 4 bytes by task 215 on cpu 0:
etb_open.constprop.0.isra.0+0x18/0x80 [vuln_msv]
l3_worker_thread_fn+0x4f/0xf0 [vuln_msv]
kthread+0x17e/0x1c0
ret_from_fork+0x22/0x30
value changed: 0x00000000 -> 0x00000001
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 215 Comm: etb10_l3_a Tainted: G O 6.1.66 #2
This no-device harness is not a real ETB10 hardware end-to-end run, but
it preserves the same shared drvdata->reading gate and the same
etb_open()/etb_release() claim/clear contract. No real ETB10 hardware
was available for runtime testing.
Build-tested with:
make olddefconfig
make -j"$(nproc)" drivers/hwtracing/coresight/coresight-etb10.o
Fixes: 27b10da8fff2 ("coresight: etb10: moving to local atomic operations")
Cc: stable@vger.kernel.org
Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260528165201.319452-1-runyu.xiao@seu.edu.cn
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coresight_add_out_conn() increments nr_outconns before calling
devm_krealloc_array() and again before devm_kmalloc(). If either
allocation fails, the counter is already bumped while the corresponding
array entry is NULL or uninitialized garbage.
coresight_add_in_conn() has the same problem with nr_inconns and
devm_krealloc_array().
In both cases the probe returns -ENOMEM, which causes
coresight_get_platform_data() to call coresight_release_platform_data()
for cleanup. That function iterates up to nr_outconns (or nr_inconns)
entries and dereferences each pointer unconditionally, hitting the NULL
or garbage entry and panicking instead of failing gracefully.
Fix by moving the counter increments to after all allocations succeed,
so the struct is always consistent on any error path.
Fixes: 3d4ff657e454 ("coresight: Dynamically add connections")
Fixes: e3f4e68797a9 ("coresight: Store in-connections as well as out-connections")
Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260511-fix-ref-count-issue-v1-1-99d647810d3c@oss.qualcomm.com
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The current SysFS flow first enables the links and sink, then rolls back
to disable them if the source fails to enable. This failure can occur if
the associated CPU is offline, which causes the SMP call to fail.
Validate whether the associated CPU is online for a per-CPU tracer.
If the CPU is offline, return -ENODEV and bail out.
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-28-f88c4a3ecfe9@arm.com
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This commit moves CPU hotplug callbacks from ETMv4 driver to core layer.
The motivation is the core layer can control all components on an
activated path rather but not only managing tracer in ETMv4 driver.
The perf event layer will disable CoreSight PMU event 'cs_etm' when
hotplug off a CPU. That means a perf mode will be always converted to
disabled mode in CPU hotplug. Arm CoreSight CPU hotplug callbacks only
need to handle the Sysfs mode and ignore the perf mode.
Add a 'mode' argument to coresight_pm_get_active_path() so it only
returns active paths for the relevant mode. Define the enum with bit
flags so it is safe for bitwise operations.
Change CPUHP_AP_ARM_CORESIGHT_STARTING to CPUHP_AP_ARM_CORESIGHT_ONLINE
so that the CPU hotplug callback runs in the online state and thread
context, allowing coresight_disable_sysfs() to be called directly to
disable the path.
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-27-f88c4a3ecfe9@arm.com
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Except for software sources (e.g. STM), other sources treat multiple
enables as equivalent to a single enable. The device mode already
tracks the binary state, so it is redundant to operate refcount.
Introduce a helper coresight_is_software_source() for check software
source. Refactor to maintain the refcount only for software sources.
This simplifies future CPU PM handling without refcount logic.
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-26-f88c4a3ecfe9@arm.com
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TRBE context can be lost when a CPU enters low power states. If a trace
source is restored while TRBE is not, tracing may run without an active
sink, which can lead to hangs on some devices (e.g., Pixel 9).
The save and restore flows are described in the section K5.5 "Context
switching" of Arm ARM (ARM DDI 0487 L.a). This commit adds save and
restore callbacks with following the software usages defined in the
architecture manual.
During the restore flow, since TRBLIMITR_EL1.E resets to 0 on a warm
reset, the trace buffer unit is disabled when idle resume, it is safe to
restore base/pointer/status registers first and program TRBLIMITR_EL1
last.
Signed-off-by: Yabin Cui <yabinc@google.com>
Co-developed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-25-f88c4a3ecfe9@arm.com
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Unlike system level sinks, per-CPU sinks may lose power during CPU idle
states. Currently, this applies specifically to TRBE. This commit
invokes save and restore callbacks for the sink in the CPU PM notifier.
If the sink provides PM callbacks but the source does not, this is
unsafe because the sink cannot be disabled safely unless the source
can also be controlled, so veto low power entry to avoid lockups.
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-24-f88c4a3ecfe9@arm.com
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Extend the CPU PM flow to control the path: disable from source up to
the node before the sink, then re-enable the same range on restore.
To avoid latency, control it up to the node before the sink.
Track per-CPU PM restore failures using percpu_pm_failed. Once a CPU
hits a restore failure, set the percpu_pm_failed and return NOTIFY_BAD
on subsequent notifications to avoid repeating half-completed
transitions.
Setting percpu_pm_failed permanently blocks CPU PM on that CPU. Such
failures are typically seen during development; disabling PM operations
simplifies the implementation, and a warning highlights the issue.
Clear this flag when the source device is unregistered.
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-23-f88c4a3ecfe9@arm.com
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Since the path pointer is stored in the source's structure, retrieve it
directly when disabling the path.
As a result, the global variables used for caching path pointers are no
longer needed. Remove them to simplify the code.
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-22-f88c4a3ecfe9@arm.com
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Set the path pointer on the target CPU during ETM enable and disable.
This ensures the device mode and path pointer are updated together and
observed atomically by the CPU PM notifier.
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-21-f88c4a3ecfe9@arm.com
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Set the path pointer on the target CPU during ETM enable and disable.
This ensures the device mode and path pointer are updated together and
observed atomically by the CPU PM notifier.
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-20-f88c4a3ecfe9@arm.com
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