kernel/linux.git/tools/perf/arch/arm/util, branch master

perf tools: Use calloc() where applicable

2026-04-09T02:21:05+00:00

Instead of using zalloc(nr_entries * sizeof_entry) that is what calloc() does. In some places where linux/zalloc.h isn't needed, remove it, add when needed and was getting it indirectly. Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

libperf cpumap: Make index and nr types unsigned

2026-04-01T21:50:53+00:00

The index into the cpumap array and the number of entries within the array can never be negative, so let's make them unsigned. This is prompted by reports that gcc 13 with -O6 is giving a alloc-size-larger-than errors. The change makes the cpumap changes and then updates the declaration of index variables throughout perf and libperf to be unsigned. The two things are hard to separate as compiler warnings about mixing signed and unsigned types breaks the build. Reported-by: Chingbin Li Closes: https://lore.kernel.org/lkml/20260212025127.841090-1-liqb365@163.com/ Tested-by: Chingbin Li Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf cs-etm: Finish removal of ETM_OPT_*

2026-03-10T12:50:44+00:00

These #defines have been removed from the kernel headers in favour of the string based PMU format attributes. Usages were previously removed from the recording side of cs-etm in Perf. Finish the removal by removing usages from the decode side too. It's a straight replacement of the old #defines with the new register bit definitions. Except cs_etm__setup_timeless_decoding() which wasn't looking at the saved metadata and was instead hard coding an access to 'attr.config'. This was vulnerable to the same issue of .config being moved to .config2 etc that the original removal of ETM_OPT_* tried to fix. So fix that too. Signed-off-by: James Clark Tested-by: Leo Yan Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf regs: Remove weak attributive archxxx_reg_mask() functions

2026-02-06T15:16:09+00:00

Currently, some architecture-specific perf-regs functions, such as arch__intr_reg_mask() and arch__user_reg_mask(), are defined with the __weak attribute. This approach ensures that only functions matching the architecture of the build/run host are compiled and executed, reducing build time and binary size. However, this __weak attribute restricts these functions to be called only on the same architecture, preventing cross-architecture functionality. For example, a perf.data file captured on x86 cannot be parsed on an ARM platform. To address this limitation, this patch removes the __weak attribute from these perf-regs functions. The architecture-specific code is moved from the arch/ directory to the util/perf-regs-arch/ directory. The appropriate architectural functions are then called based on the EM_HOST. No functional changes are intended. Suggested-by: Ian Rogers Reviewed-by: Ian Rogers Signed-off-by: Dapeng Mi Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Guo Ren Cc: Ingo Molnar Cc: James Clark Cc: John Garry Cc: Mike Leach Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Thomas Falcon Cc: Will Deacon Cc: Xudong Hao Cc: Zide Chen [ Fixed up somme fuzz with s390 and riscv Build files wrt removing perf_regs.o ] Signed-off-by: Arnaldo Carvalho de Melo

perf regs: Refactor use of arch__sample_reg_masks() to perf_reg_name()

2026-01-23T19:58:39+00:00

arch__sample_reg_masks isn't supported on ARM(32), csky, loongarch, MIPS, RISC-V and s390. The table returned by the function just has the name of a register paired with the corresponding sample_regs_user mask value. For a given perf register we can compute the name with perf_reg_name and the mask is just 1 left-shifted by the perf register number. Change __parse_regs to use this method for finding registers rather than arch__sample_reg_masks, thereby adding __parse_regs support for ARM(32), csky, loongarch, MIPS, RISC-V and s390. As arch__sample_reg_masks is then unused, remove the now unneeded declarations. Signed-off-by: Ian Rogers Tested-by: Thomas Richter Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dapeng Mi Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf unwind-libdw: Fix a cross-arch unwinding bug

2026-01-20T16:00:39+00:00

The set_initial_registers field of Dwfl_Thread_Callbacks needs to be set according to the arch of the stack samples being analyzed, not the arch that perf itself is built for. Currently perf fails to unwind stack samples collected from archs different from that of the host perf is running on. This patch moves the arch-specific implementations of set_initial_registers from tools/perf/arch to tools/perf/utli/unwind-libdw-arch, similar to the way the perf-regs-arch folder contains arch-specific functions related to registers, and chooses the implementation based on the arch of the data being processed. Reviewed-by: Ian Rogers Signed-off-by: Shimin Guo Acked-by: Namhyung Kim Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Ian Rogers Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Don't hard code config attribute when configuring the event

2026-01-15T02:16:32+00:00

These instances of hard coded config attributes are used for configuring and validating the event options. Use the config attribute that's published by the driver by replacing the open coded operations with evsel__get_config_val() and evsel__set_config_if_unset(). Reviewed-by: Ian Rogers Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Don't use hard coded config bits when setting up TRCCONFIGR

2026-01-15T02:16:22+00:00

Perf only looks at attr.config when determining what was programmed into TRCCONFIGR. These bits could theoretically be in any of the config fields. Use the evsel__get_config_val() helper so it's agnostic to which config field they are in. The kernel will also stop publishing the TRCCONFIGR register bits in a header [1] so preempt that by defining them here. [1]: https://lore.kernel.org/linux-arm-kernel/20251128-james-cs-syncfreq-v8-10-4d319764cc58@linaro.org/ Reviewed-by: Ian Rogers Reviewed-by: Leo Yan Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Don't use hard coded config bits when setting up ETMCR

2026-01-15T02:16:10+00:00

Perf only looks at attr.config when determining what was programmed into ETMCR. These bits could theoretically be in any of the config fields. Add a generic helper to find the value of any named format field in any config field and then use it to get the attributes relevant to ETMCR. The kernel will also stop publishing the ETMCR register bits in a header [1] so preempt that by defining them here. Move field_prep() to util.h so we can define it along side field_get(). Unfortunately FIELD_PREP() and FIELD_GET() from the kernel can't be used as they require the mask to be a compile time constant. [1]: https://lore.kernel.org/linux-arm-kernel/20251128-james-cs-syncfreq-v8-10-4d319764cc58@linaro.org/ Reviewed-by: Ian Rogers Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Make a helper to find the Coresight evsel

2026-01-15T02:16:01+00:00

This pattern occurs a few times and we'll add another one later, so add a helper function for it. Reviewed-by: Ian Rogers Reviewed-by: Leo Yan Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo