perf riscv: Remove dwarf-regs.c and add dwarf-regs-table.h

The file just provides the function get_arch_regstr, however, if in
the only caller get_dwarf_regstr EM_HOST is used for the EM_NONE case,

perf riscv: Remove dwarf-regs.c and add dwarf-regs-table.h

The file just provides the function get_arch_regstr, however, if in
the only caller get_dwarf_regstr EM_HOST is used for the EM_NONE case,
and the register table is provided in a header file, the function can
never be called. So remove as dead code. Tidy up the EM_NONE cases for
riscv in dwarf-regs.c.

Reviewed-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Shenlin Liang <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Guilherme Amadio <[email protected]>
Cc: Steinar H. Gunderson <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Alexander Lobakin <[email protected]>
Cc: Przemek Kitszel <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: James Clark <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Chen Pei <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Aditya Gupta <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Bibo Mao <[email protected]>
Cc: John Garry <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Dima Kogan <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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perf build: Rename CONFIG_DWARF to CONFIG_LIBDW

In Makefile.config for unwinding the name dwarf implies either
libunwind or libdw. Make it clearer that CONFIG_DWARF is really just
defined when libdw

perf build: Rename CONFIG_DWARF to CONFIG_LIBDW

In Makefile.config for unwinding the name dwarf implies either
libunwind or libdw. Make it clearer that CONFIG_DWARF is really just
defined when libdw is present by renaming to CONFIG_LIBDW.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Tested-by: Leo Yan <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Shenlin Liang <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Guilherme Amadio <[email protected]>
Cc: Steinar H. Gunderson <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Alexander Lobakin <[email protected]>
Cc: Przemek Kitszel <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Masami Hiramatsu (Google) <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: James Clark <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Chen Pei <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Aditya Gupta <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Bibo Mao <[email protected]>
Cc: John Garry <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Dima Kogan <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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perf util: Make util its own library

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 conveni

perf util: Make util its own library

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

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perf kvm/riscv: Port perf kvm stat to RISC-V

'perf kvm stat report/record' generates a statistical analysis of KVM
events and can be used to analyze guest exit reasons.

"report" reports statistical

perf kvm/riscv: Port perf kvm stat to RISC-V

'perf kvm stat report/record' generates a statistical analysis of KVM
events and can be used to analyze guest exit reasons.

"report" reports statistical analysis of guest exit events.

To record kvm events on the host:
# perf kvm stat record -a

To report kvm VM EXIT events:
# perf kvm stat report --event=vmexit

Signed-off-by: Shenlin Liang <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
Tested-by: Atish Patra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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perf tools riscv: Add support for get_cpuid_str function

The get_cpuid_str function returns the string that contains values of
MVENDORID, MARCHID and MIMPID in hex format separated by coma.

The val

perf tools riscv: Add support for get_cpuid_str function

The get_cpuid_str function returns the string that contains values of
MVENDORID, MARCHID and MIMPID in hex format separated by coma.

The values themselves are taken from first cpu entry in "/proc/cpuid"
that contains "mvendorid", "marchid" and "mimpid".

Signed-off-by: Nikita Shubin <[email protected]>
Tested-by: Kautuk Consul <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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perf tools: Avoid 'sample_reg_masks' being const + weak

Being const + weak breaks with some compilers that constant-propagate
from the weak symbol. This behavior is outside of the specification, but

perf tools: Avoid 'sample_reg_masks' being const + weak

Being const + weak breaks with some compilers that constant-propagate
from the weak symbol. This behavior is outside of the specification, but
in LLVM is chosen to match GCC's behavior.

LLVM's implementation was set in this patch:

https://github.com/llvm/llvm-project/commit/f49573d1eedcf1e44893d5a062ac1b72c8419646

A const + weak symbol is set to be weak_odr:

https://llvm.org/docs/LangRef.html

ODR is one definition rule, and given there is one constant definition
constant-propagation is possible. It is possible to get this code to
miscompile with LLVM when applying link time optimization. As compilers
become more aggressive, this is likely to break in more instances.

Move the definition of sample_reg_masks to the conditional part of
perf_regs.h and guard usage with HAVE_PERF_REGS_SUPPORT. This avoids the
weak symbol.

Fix an issue when HAVE_PERF_REGS_SUPPORT isn't defined from patch v1.
In v3, add perf_regs.c for architectures that HAVE_PERF_REGS_SUPPORT but
don't declare sample_regs_masks.

Further notes:

Jiri asked:

"Is this just a precaution or you actualy saw some breakage?"

Ian answered:

"We saw a breakage with clang with thinlto enabled for linking. Our
compiler team had recently seen, and were surprised by, a similar issue
and were able to dig out the weak ODR issue."

Signed-off-by: Ian Rogers <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alexey Budankov <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: [email protected]
Cc: Guo Ren <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: [email protected]
Cc: Mao Han <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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riscv: Add support for libdw

This patch adds support for DWARF register mappings and libdw registers
initialization, which is used by perf callchain analyzing when
--call-graph=dwarf is given.

Sign

riscv: Add support for libdw

This patch adds support for DWARF register mappings and libdw registers
initialization, which is used by perf callchain analyzing when
--call-graph=dwarf is given.

Signed-off-by: Mao Han <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Greentime Hu <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: linux-riscv <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Guo Ren <[email protected]>
Tested-by: Greentime Hu <[email protected]>
Signed-off-by: Paul Walmsley <[email protected]>

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