linux-toradex.git/tools/perf/util/perf-regs-arch, branch master

perf record: Add support for arch_sdt_arg_parse_op() on s390

2026-03-26T21:38:54+00:00

commit e5e66adfe45a6 ("perf regs: Remove __weak attributive arch_sdt_arg_parse_op() function")
removes arch_sdt_arg_parse_op() functions and reveals missing s390 support.
The following warning is printed:

  Unknown ELF machine 22, standard arguments parse will be skipped.

ELF machine 22 is the EM_S390 host. This happens with command
  # ./perf record -v -- stress-ng -t 1s --matrix 0
when the event is not specified.

Add s390 specific __perf_sdt_arg_parse_op_s390() function to support
-architecture calls to arch_sdt_arg_parse_op() for s390.
The warning disappears.

Signed-off-by: Thomas Richter 
Reviewed-by: Ian Rogers 
Tested-by: Jan Polensky 
Cc: Dapeng Mi 
Signed-off-by: Namhyung Kim

perf regs: Remove __weak attributive arch_sdt_arg_parse_op() function

2026-02-06T15:16:12+00:00

In line with the previous patch, the __weak arch_sdt_arg_parse_op()
function is removed.

Architectural-specific implementations in the arch/ directory are now
converted into sub-functions within the util/perf-regs-arch/ directory.

The perf_sdt_arg_parse_op() function will call these sub-functions based
on the EM_HOST.

This change enables cross-architecture calls to arch_sdt_arg_parse_op().

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 powerpc and x86 Build files wrt removing perf_regs.o ]
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 perf_regs: Accurately compute register names for CSKY

2026-01-26T21:31:16+00:00

CSKY needs the e_flags to determine the ABI level and know whether
additional registers are encoded or not. Wire this up now that the
e_flags for a thread can be determined.

Signed-off-by: Ian Rogers 
Cc: Aditya Bodkhe 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Athira Rajeev 
Cc: Chun-Tse Shao 
Cc: Guo Ren 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Sergei Trofimovich 
Cc: Shimin Guo 
Cc: Stephen Brennan 
Cc: Swapnil Sapkal 
Cc: Tianyou Li 
[ Conditionally define EF_CSKY_ABIMASK and EF_CSKY_ABIV2 for older distros ]
Signed-off-by: Arnaldo Carvalho de Melo

perf util: Make util its own library

2024-06-26T18:07:42+00:00

Make the util directory into its own library. This is done to avoid
compiling code twice, once for the perf tool and once for the perf
python module. For convenience:
  arch/common.c
  scripts/perl/Perf-Trace-Util/Context.c
  scripts/python/Perf-Trace-Util/Context.c
are made part of this library.

Signed-off-by: Ian Rogers 
Reviewed-by: James Clark 
Cc: Suzuki K Poulose 
Cc: Kees Cook 
Cc: Palmer Dabbelt 
Cc: Albert Ou 
Cc: Nick Terrell 
Cc: Gary Guo 
Cc: Alex Gaynor 
Cc: Boqun Feng 
Cc: Wedson Almeida Filho 
Cc: Ze Gao 
Cc: Alice Ryhl 
Cc: Andrei Vagin 
Cc: Yicong Yang 
Cc: Jonathan Cameron 
Cc: Guo Ren 
Cc: Miguel Ojeda 
Cc: Will Deacon 
Cc: Mike Leach 
Cc: Leo Yan 
Cc: Oliver Upton 
Cc: John Garry 
Cc: Benno Lossin 
Cc: Björn Roy Baron 
Cc: Andreas Hindborg 
Cc: Paul Walmsley 
Signed-off-by: Namhyung Kim 
Link: https://lore.kernel.org/r/20240625214117.953777-7-irogers@google.com

perf parse-regs: Always build perf register functions

2024-02-15T21:48:20+00:00

Currently, the macro HAVE_PERF_REGS_SUPPORT is used as a switch to turn
on or turn off the code of perf registers. If any architecture cannot
support perf register, it disables the perf register parsing, for both
the native parsing and cross parsing for other architectures.

To support both the native parsing and cross parsing, the tool should
always build the perf regs functions. Thus, this patch removes
HAVE_PERF_REGS_SUPPORT from the perf regs files.

Signed-off-by: Leo Yan 
Reviewed-by: Ian Rogers 
Cc: James Clark 
Cc: Palmer Dabbelt 
Cc: Albert Ou 
Cc: Huacai Chen 
Cc: Guo Ren 
Cc: Will Deacon 
Cc: Mike Leach 
Cc: Kan Liang 
Cc: Ming Wang 
Cc: John Garry 
Cc: Paul Walmsley 
Cc: linux-csky@vger.kernel.org
Cc: linux-riscv@lists.infradead.org
Signed-off-by: Namhyung Kim 
Link: https://lore.kernel.org/r/20240214113947.240957-3-leo.yan@linux.dev

perf parse-regs: Introduce functions perf_arch_reg_{ip|sp}()

2023-08-16T11:46:45+00:00

The current code uses macros PERF_REG_IP and PERF_REG_SP for parsing
registers and we build perf with these macros statically, which means it
only can correctly analyze CPU registers for the native architecture and
fails to support cross analysis (e.g. we build perf on x86 and cannot
analyze Arm64's registers).

We need to generalize util/perf_regs.c for support multi architectures,
as a first step, this commit introduces new functions perf_arch_reg_ip()
and perf_arch_reg_sp(), these two functions dynamically return IP and SP
register index respectively according to the parameter "arch".

Every architecture has its own functions (like __perf_reg_ip_arm64 and
__perf_reg_sp_arm64), these architecture specific functions are defined
in each arch source file under folder util/perf-regs-arch; at the end
all of them are built into the tool for cross analysis.

Committer notes:

Make DWARF_MINIMAL_REGS() an inline function, so that we can use the
__maybe_unused attribute for the 'arch' parameter, as this will avoid a
build failure when that variable is unused in the callers. That happens
when building on unsupported architectures, the ones without
HAVE_PERF_REGS_SUPPORT defined.

Signed-off-by: Leo Yan 
Acked-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Eric Lin 
Cc: Fangrui Song 
Cc: Guo Ren 
Cc: Huacai Chen 
Cc: Ingo Molnar 
Cc: Ivan Babrou 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Kan Liang 
Cc: Mark Rutland 
Cc: Mike Leach 
Cc: Ming Wang 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Sandipan Das 
Cc: Will Deacon 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-csky@vger.kernel.org
Cc: linux-riscv@lists.infradead.org
Link: https://lore.kernel.org/r/20230606014559.21783-3-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

perf parse-regs: Refactor arch register parsing functions

2023-08-16T11:37:52+00:00

Every architecture has a specific register parsing function for
returning register name based on register index, to support cross
analysis (e.g. we use perf x86 binary to parse Arm64's perf data), we
build all these register parsing functions into the tool, this is why
we place all related functions into util/perf_regs.c.

Unfortunately, since util/perf_regs.c needs to include every arch's
perf_regs.h, this easily introduces duplicated definitions coming from
multiple headers, finally it's fragile for building and difficult for
maintenance.

We cannot simply move these register parsing functions into the
corresponding 'arch' folder, the folder is only conditionally built
based on the target architecture.

Therefore, this commit creates a new folder util/perf-regs-arch/ and
uses a dedicated source file to keep every architecture's register
parsing function to avoid definition conflicts.

This is only a refactoring, no functionality change is expected.

Committer notes:

Had to add util/perf-regs-arch/*.c to tools/perf/util/python-ext-sources
to keep 'perf test python' passing.

Signed-off-by: Leo Yan 
Acked-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Eric Lin 
Cc: Fangrui Song 
Cc: Guo Ren 
Cc: Huacai Chen 
Cc: Ingo Molnar 
Cc: Ivan Babrou 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Kan Liang 
Cc: Mark Rutland 
Cc: Mike Leach 
Cc: Ming Wang 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Sandipan Das 
Cc: Will Deacon 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-csky@vger.kernel.org
Cc: linux-riscv@lists.infradead.org
Link: https://lore.kernel.org/r/20230606014559.21783-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo