[PATCH v4 0/6] perf arm_spe: Dump IMPDEF events

[James Clark]

In the Arm SPE raw data dump, IMPDEF events aren't printed. Add the
ability to add names for some known events or print the raw event number
for unknown events.

For example:

  $ perf report -D

  ... ARM SPE data: size 0xd000 bytes
  00000000: b0 18 c6 32 80 00 80 ff a0  PC 0xff80008032c618 el1 ns=1
  00000009: 64 e7 42 00 00              CONTEXT 0x42e7 el1
  0000000e: 00 00 00 00 00              PAD
  00000013: 49 00                       LD GP-REG
  00000015: 52 16 10               	EV RETIRED L1D-ACCESS TLB-ACCESS

On N1 the event line becomes:

  00000015: 52 16 10                    EV RETIRED L1D-ACCESS TLB-ACCESS LATE-PREFETCH

Or on other cores it becomes:

  00000015: 52 16 10                    EV RETIRED L1D-ACCESS TLB-ACCESS IMPDEF:12

Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
---
Changes in v4:
- Change a pr_err() to pr_warning_once() to avoid spam (Sashiko)
- Link to v3: https://lore.kernel.org/r/20260414-james-spe-impdef-decode-v3-0-63baf9c893b1@xxxxxxxxxx

Changes in v3:
- Revert for_each_set_bit() back to a loop with BIT_ULL to fix both 32
  bit builds and decoding on big endian machines.
- Link to v2: https://lore.kernel.org/r/20260407-james-spe-impdef-decode-v2-0-55d3ef997c48@xxxxxxxxxx

Changes in v2:
- Put MIDR in arm_spe_pkt (Leo)
- Use for_each_set_bit() (Leo)
- Use BIT_ULL() to fix 32bit builds (Ian)
- Don't call strtol() with NULL (Ian)
- Link to v1: https://lore.kernel.org/r/20260401-james-spe-impdef-decode-v1-0-ad0d372c220c@xxxxxxxxxx

---
James Clark (6):
      perf arm_spe: Make a function to get the MIDR
      perf arm_spe: Handle missing CPU IDs
      perf arm_spe: Store MIDR in arm_spe_pkt
      perf arm_spe: Turn event name mappings into an array
      perf arm_spe: Decode Arm N1 IMPDEF events
      perf arm_spe: Print remaining IMPDEF event numbers

 tools/perf/util/arm-spe-decoder/Build              |   2 +
 tools/perf/util/arm-spe-decoder/arm-spe-decoder.c  |  17 ++-
 tools/perf/util/arm-spe-decoder/arm-spe-decoder.h  |   3 +-
 .../util/arm-spe-decoder/arm-spe-pkt-decoder.c     | 144 ++++++++++++++-------
 .../util/arm-spe-decoder/arm-spe-pkt-decoder.h     |   5 +-
 tools/perf/util/arm-spe.c                          |  62 ++++++---
 6 files changed, 158 insertions(+), 75 deletions(-)
---
base-commit: 4e03d6494f9504f8af46ba68a2a8b6877c196789
change-id: 20260331-james-spe-impdef-decode-d944f4fdcff7

Best regards,
-- 
James Clark <james.clark@xxxxxxxxxx>