Build per-domain DSP search path cache with ARCH_VER

[Vinayak Katoch (quic-vkatoch)]

Replace the global DSP_LIBS_LOCATION in get_dsp_search_path() with a per-domain DSP_SEARCH_PATHS_CACHE[], built lazily in domain_init().

Search path preference order for each domain:

1. ADSP_LIBRARY_PATH env (user/container, prepended at open-time)
2. Arch-specific path (CONFIG_BASE_DIR/hexagon/v<XY>)
   • Resolved via fastrpc_get_cap(ARCH_VER) low byte on modern targets
   • Falls back to per-domain YAML key (ADSP_ARCH..GDSP1_ARCH) on legacy targets where the capability API is not supported
3. DSP_LIBS_LOCATION (board-specific YAML path + generic fallback)

Add optional *_ARCH keys to the config schema and parse them into DSP_ARCH_FROM_YAML[] in fastrpc_config_parser.c, exposed via get_dsp_arch_from_yaml().

CRs-Fixed: 4608348

[github-actions]

qualcomm/fastrpc.triage This pull request has been marked as stale due to 30 days of inactivity.

[anankulk]

_{Pre-merge CI results — patch a74618a99ce6}

Validated On

• fastrpc baseline (development): 9d409211527f
• kernel baseline (qcom-next (reference)): 6548ba1da927

Kernel: 7.1.0-01274-g19b282f41758-dirty

Test Matrix

Targets	Domain	PD Type	Tests	Result
lemans-evk	ADSP	Signed	3/3	✅ Pass
lemans-evk	CDSP	Signed	3/3	✅ Pass
lemans-evk	CDSP	Unsigned	3/3	✅ Pass
lemans-evk	CDSP1	Signed	3/3	✅ Pass
lemans-evk	CDSP1	Unsigned	3/3	✅ Pass
qcs615-ride	ADSP	Signed	3/3	✅ Pass
qcs615-ride	CDSP	Signed	3/3	✅ Pass
qcs615-ride	CDSP	Unsigned	3/3	✅ Pass
qcs6490-rb3gen2	ADSP	Signed	3/3	✅ Pass
qcs6490-rb3gen2	CDSP	Signed	3/3	✅ Pass
qcs6490-rb3gen2	CDSP	Unsigned	3/3	✅ Pass
qcs8300-ride	ADSP	Signed	3/3	✅ Pass
qcs8300-ride	CDSP	Signed	3/3	✅ Pass
qcs8300-ride	CDSP	Unsigned	3/3	✅ Pass
sm8750-mtp	ADSP	Signed	3/3	✅ Pass
sm8750-mtp	CDSP	Signed	3/3	✅ Pass
sm8750-mtp	CDSP	Unsigned	3/3	✅ Pass

✅ Verification Note: Results verified on respective targets via automated LAVA testing (17/17 invocations passed, 51/51 tests passed).

LAVA Jobs:

• lemans-evk — LAVA Job
• qcs615-ride — LAVA Job
• qcs6490-rb3gen2 — LAVA Job
• qcs8300-ride — LAVA Job
• sm8750-mtp — LAVA Job

_{CI run: https://github.com/qualcomm-linux-stg/fastrpc-config/actions/runs/29328415887}