kernel/git/next/linux-next.git/drivers/hwtracing/ptt, branch master

Merge tag 'char-misc-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2026-08-25T16:38:50+00:00

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 ...

hwtracing: hisi_ptt: Remove unnecessary trace buffer zeroing in trace_start()

2026-08-07T09:45:11+00:00

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 Reviewed-by: Yicong Yang Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20260414172451.14331-3-sanman.pradhan@hpe.com

hwtracing: hisi_ptt: Propagate DMA reset timeout in trace_start()

2026-08-07T09:45:11+00:00

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 Reviewed-by: Sizhe Liu Reviewed-by: Yicong Yang Tested-by: Sizhe Liu Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20260414172451.14331-2-sanman.pradhan@hpe.com

hwtracing: hisi_ptt: Use sysfs_emit() for cpumask show

2026-07-22T19:38:37+00:00

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

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

hwtracing: hisi_ptt: Assign parent for event_source device

2024-05-02T10:36:11+00:00

Currently the PMU device appears directly under /sys/devices/ Only root busses should appear there, so instead assign the pmu->dev parent to be the PCI device. Link: https://lore.kernel.org/linux-cxl/ZCLI9A40PJsyqAmq@kroah.com/ Cc: Suzuki K Poulose Reviewed-by: Yicong Yang Signed-off-by: Jonathan Cameron Acked-by: Suzuki K Poulose Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20240412161057.14099-31-Jonathan.Cameron@huawei.com

hwtracing: hisi_ptt: Move type check to the beginning of hisi_ptt_pmu_event_init()

2024-02-26T09:54:38+00:00

When perf_init_event() calls perf_try_init_event() to init pmu driver, searches for the next pmu driver only when the return value is -ENOENT. Therefore, hisi_ptt_pmu_event_init() needs to check the type at the beginning of the function. Otherwise, in the case of perf-task mode, perf_try_init_event() returns -EOPNOTSUPP and skips subsequent pmu drivers, causes perf_init_event() to fail. Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device") Signed-off-by: Yang Jihong Reviewed-by: Yicong Yang Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20240108121906.3514820-1-yangjihong1@huawei.com

hwtracing: hisi_ptt: Optimize the trace data committing

2023-11-16T11:36:33+00:00

In the current implementation, there're 4*4MiB trace buffer and hardware will fill the buffer one by one. The driver will get notified if one buffer is full and then copy data to the AUX buffer. If there's no enough room for the next trace buffer, we'll commit the AUX buffer to the perf core and try to apply a new one. In a typical configuration the AUX buffer will be 16MiB, so we'll commit the data after the whole AUX buffer is occupied. Then the driver cannot apply a new AUX buffer immediately until the committed data is consumed by userspace and then there's room in the AUX buffer again. This patch tries to optimize this by commit the data after one single trace buffer is filled. Since there's still room in the AUX buffer, driver can apply a new one without failure and don't need to wait for the userspace to consume the data. Signed-off-by: Yicong Yang Acked-by: Jonathan Cameron Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20231010084731.30450-4-yangyicong@huawei.com

hwtracing: hisi_ptt: Disable interrupt after trace end

2023-11-16T11:36:27+00:00

On trace end we disable the hardware but leave the interrupt unmasked. Mask the interrupt to make the process reverse to the start. No actual issue since hardware should send no interrupt after disabled. Signed-off-by: Yicong Yang Acked-by: Jonathan Cameron Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20231010084731.30450-2-yangyicong@huawei.com