This patchset extend the perf sample regs infrastructure to include architecture specific regs. Current perf_sample_regs_intr exports only registers in the pt_regs to perf.data using PERF_SAMPLE_REGS_INTR sample type. But sometimes we end up looking for or prefer raw register values at the interrupt during debug.
This patchset extends the perf_regs to include arch specific struct, and makes perf_sample_regs_intr in kernel/event/core.c as __weak__ function. This way, an arch specific implementation of perf_sample_regs_intr() can update the arch specific data to the perf_regs. First patch defines a new structure arch_misc_reg and updates the same in the struct perf_regs. Patch also modifies the perf_reg_value() and perf_output_sample_regs() to take perf_regs parameter instead of pt_regs. Second patch updates struct arch_misc_reg for arch/powerpc with pmu registers and adds offsetof macro for the same. It extends perf_reg_value() to use reg idx to decide on struct to return value from. Third patch adds arch specific perf_sample_regs_intr() in arch/powerpc to hook up the arch_misc_regs to perf_regs. This patchset depends on the recent posting by Anju T in linuxppc-dev@lists.ozlabs.org to enable PERF_SAMPLE_REGS_INTR support in arch/powerpc. https://patchwork.ozlabs.org/patch/539242/ https://patchwork.ozlabs.org/patch/539243/ https://patchwork.ozlabs.org/patch/539244/ Would appreciate comments and feedback. Signed-off-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Ingo Molnar <mi...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Jiri Olsa <jo...@kernel.org> Cc: Arnaldo Carvalho de Melo <a...@kernel.org> Cc: Stephane Eranian <eran...@gmail.com> Cc: Russell King <li...@arm.linux.org.uk> Cc: Catalin Marinas <catalin.mari...@arm.com> Cc: Will Deacon <will.dea...@arm.com> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: Michael Ellerman <m...@ellerman.id.au> Cc: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com> Madhavan Srinivasan (3): perf/core: extend perf_regs to include arch specific regs perf/powerpc: update macros and add regs to arch_misc_reg struct perf/powerpc: Functions to update arch_misc_regs arch/arm/include/asm/ptrace.h | 2 ++ arch/arm/kernel/perf_regs.c | 4 +++- arch/arm64/include/asm/ptrace.h | 2 ++ arch/arm64/kernel/perf_regs.c | 4 +++- arch/powerpc/include/uapi/asm/perf_regs.h | 10 ++++++++++ arch/powerpc/include/uapi/asm/ptrace.h | 11 +++++++++++ arch/powerpc/perf/core-book3s.c | 29 +++++++++++++++++++++++++++++ arch/powerpc/perf/perf_regs.c | 28 ++++++++++++++++++++++++++-- arch/x86/include/asm/ptrace.h | 2 ++ arch/x86/kernel/perf_regs.c | 4 +++- include/linux/perf_regs.h | 5 +++-- kernel/events/core.c | 8 ++++---- tools/perf/arch/powerpc/include/perf_regs.h | 16 ++++++++++++++++ 13 files changed, 114 insertions(+), 11 deletions(-) -- 1.9.1 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
