[PATCH V11 0/4]perf/powerpc: Add ability to sample intr machine state in powerpc

[Anju T]

This short patch series adds the ability to sample the interrupted
machine state for each hardware sample.

To test this patchset,
Eg:

$ perf record -I?       # list supported registers

output:
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 perf.data 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 
  PERF_REG_POWERPC_GPR* to PERF_REG_POWERPC_R*.
- 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 
  tools/perf/arch/powerpc/include/perf_regs.h

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.
  ie #define PERF_REG_SP  PERF_REG_POWERPC_R1 should be #define PERF_REG_SP   PERF_REG_POWERPC_GPR1


Changes from V5:

- Enabled perf_sample_regs_user also in this patch set.Functions added in 
   arch/powerpc/perf/perf_regs.c
- 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
- PERF_REGS_POWERPC_RESULT is removed.

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

-- 
2.1.0