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Subject[PATCH V11 0/4]perf/powerpc: Add ability to sample intr machine state in powerpc
This short patch series adds the ability to sample the interrupted
machine state for each hardware sample.

To test this patchset,

$ perf record -I? # list supported registers

available registers: r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15 r16 r17 r18 r19 r20 r21 r22 r23 r24 r25 r26 r27 r28 r29 r30 r31 nip msr orig_r3 ctr link xer ccr softe trap dar dsisr

usage: perf record [<options>] [<command>]
or: perf record [<options>] -- <command> [<options>]

-I, --intr-regs[=<any register>]
sample selected machine registers on interrupt, use -I ? to list register names

$ perf record -I ls # record machine state at interrupt
$ perf script -D # read the file

Sample output obtained for this patchset/ output looks like as follows:

496768515470 0x1988 [0x188]: PERF_RECORD_SAMPLE(IP, 0x1): 4522/4522: 0xc0000000001e538c period: 1 addr: 0
... intr regs: mask 0x7ffffffffff ABI 64-bit
.... r0 0xc0000000001e5e34
.... r1 0xc000000fe733f9a0
.... r2 0xc000000001523100
.... r3 0xc000000ffaadeb60
.... r4 0xc000000003456800
.... r5 0x73a9b5e000
.... r6 0x1e000000
.... r7 0x0
.... r8 0x0
.... r9 0x0
.... r10 0x1
.... r11 0x0
.... r12 0x24022822
.... r13 0xc00000000feec180
.... r14 0x0
.... r15 0xc000001e4be18800
.... r16 0x0
.... r17 0xc000000ffaac5000
.... r18 0xc000000fe733f8a0
.... r19 0xc000000001523100
.... r20 0xc00000000009fd1c
.... r21 0xc000000fcaa69000
.... r22 0xc0000000001e4968
.... r23 0xc000000001523100
.... r24 0xc000000fe733f850
.... r25 0xc000000fcaa69000
.... r26 0xc000000003b8fcf0
.... r27 0xfffffffffffffead
.... r28 0x0
.... r29 0xc000000fcaa69000
.... r30 0x1
.... r31 0x0
.... nip 0xc0000000001dd320
.... msr 0x9000000000009032
.... orig_r3 0xc0000000001e538c
.... ctr 0xc00000000009d550
.... link 0xc0000000001e5e34
.... xer 0x0
.... ccr 0x84022882
.... softe 0x0
.... trap 0xf01
.... dar 0x0
.... dsisr 0xf00040060000004
... thread: :4522:4522
...... dso: /root/.debug/.build-id/b0/ef11b1a1629e62ac9de75199117ee5ef9469e9
:4522 4522 496.768515: 1 cycles: c0000000001e538c .perf_event_context_sched_in (/boot/vmlinux)

Changes from v10:

- Included SOFTE as suggested by mpe
- The name of registers displayed is changed from
gpr* to r* also the macro names changed from
- The conflict in returning the ABI is resolved.
- #define PERF_REG_SP is again changed to PERF_REG_POWERPC_R1
- Comment in tools/perf/config/Makefile is updated.
- removed the "Reviewed-By" tag as the patch has logic changes.

Changes from V9:

- Changed the name displayed for link register from "lnk" to "link" in

changes from V8:

- Corrected the indentation issue in the Makefile mentioned in 3rd patch

Changes from V7:

- Addressed the new line issue in 3rd patch.

Changes from V6:

- Corrected the typo in patch tools/perf: Map the ID values with register names.

Changes from V5:

- Enabled perf_sample_regs_user also in this patch set.Functions added in
- Added Maddy's patch to this patchset for enabling -I? option which will
list the supported register names.

Changes from V4:

- Removed the softe and MQ from all patches
- Switch case is replaced with an array in the 3rd patch

Changes from V3:

- Addressed the comments by Sukadev regarding the nits in the descriptions.
- Modified the subject of first patch.
- Included the sample output in the 3rd patch also.

Changes from V2:

- tools/perf/config/Makefile is moved to the patch tools/perf.
- The patchset is reordered.
- perf_regs_load() function is used for the dwarf unwind test.Since it is not required here,
it is removed from tools/perf/arch/powerpc/include/perf_regs.h

Changes from V1:

- Solved the name missmatch issue in the from and signed-off field of the patch series.
- Added necessary comments in the 3rd patch ie perf/powerpc ,as suggested by Maddy.

Anju T (3):
perf/powerpc: assign an id to each powerpc register
perf/powerpc: add support for sampling intr machine state
tools/perf: Map the ID values with register names

Madhavan Srinivasan (1):
tool/perf: Add sample_reg_mask to include all perf_regs regs

arch/powerpc/Kconfig | 1 +
arch/powerpc/include/uapi/asm/perf_regs.h | 50 ++++++++++++++++
arch/powerpc/perf/Makefile | 1 +
arch/powerpc/perf/perf_regs.c | 91 +++++++++++++++++++++++++++++
tools/perf/arch/powerpc/include/perf_regs.h | 69 ++++++++++++++++++++++
tools/perf/arch/powerpc/util/Build | 1 +
tools/perf/arch/powerpc/util/perf_regs.c | 49 ++++++++++++++++
tools/perf/config/Makefile | 5 ++
8 files changed, 267 insertions(+)
create mode 100644 arch/powerpc/include/uapi/asm/perf_regs.h
create mode 100644 arch/powerpc/perf/perf_regs.c
create mode 100644 tools/perf/arch/powerpc/include/perf_regs.h
create mode 100644 tools/perf/arch/powerpc/util/perf_regs.c


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