fix: skip DSP_AudioPD when AudioPD FastRPC prerequisites are missing

[smuppand]

This PR improves DSP_AudioPD validation by adding an AudioPD FastRPC allocator pre-check before running adsprpcd validation.

Why this PR is needed:

• On targets such as qcs615-ride, the kernel exposes only the secure ADSP FastRPC device and does not provide the non-secure /dev/fastrpc-adsp path or ADSP RPC remote heap reserved-memory required for AudioPD validation.
• Running the existing test on such targets triggers repeated FastRPC kernel errors such as "dsp information is incorrect err: -1".
• The previous logic also used adsprpcd wchan as a hard PASS/FAIL gate, which can be flaky because the daemon may legitimately move between poll, epoll, or nanosleep states depending on timing.

Changes included:

• Add a pre-check for AudioPD FastRPC allocator prerequisites:
  • /dev/fastrpc-adsp must be present
  • ADSP remoteproc must be running
  • ADSP RPC remote heap reserved-memory must be available
• Mark the test SKIP when these prerequisites are missing instead of running AudioPD validation and producing kernel error spam.
• Keep existing adsprpcd validation for supported targets such as RB3GEN2.
• Treat unexpected adsprpcd wchan values as debug-only instead of failing the test.

[smuppand]

Here the results looks like on qcs615-ride and RB3GEN2

root@qcs615-ride:/tmp/Runner/suites/Multimedia/DSP_AudioPD# ./run.sh
[INFO] 1970-01-01 03:55:19 - -----------------------------------------------------------------------------------------
[INFO] 1970-01-01 03:55:19 - -------------------Starting DSP_AudioPD Testcase----------------------------
[INFO] 1970-01-01 03:55:19 - === Test Initialization ===
[INFO] 1970-01-01 03:55:19 - Checking dependencies: adsprpcd tr awk grep sleep find cat
[INFO] 1970-01-01 03:55:19 - === AudioPD FastRPC allocator pre-check ===
[WARN] 1970-01-01 03:55:19 - [audiopd] Non-secure ADSP FastRPC device missing: /dev/fastrpc-adsp
[INFO] 1970-01-01 03:55:19 - [audiopd] Secure-only ADSP FastRPC device present: /dev/fastrpc-adsp-secure
[INFO] 1970-01-01 03:55:19 - [audiopd] ADSP remoteproc: /sys/class/remoteproc/remoteproc1 state=running
[SKIP] 1970-01-01 03:55:19 - [audiopd] AudioPD requires /dev/fastrpc-adsp, but only secure/no ADSP FastRPC device is available.
[SKIP] 1970-01-01 03:55:19 - [audiopd] ADSP RPC remote heap reserved-memory is not available.
[SKIP] 1970-01-01 03:55:19 - DSP_AudioPD SKIP - AudioPD FastRPC allocator prerequisites are not available on this target
[INFO] 1970-01-01 03:55:19 - -------------------Completed DSP_AudioPD Testcase----------------------------
root@qcs615-ride:/tmp/Runner/suites/Multimedia/DSP_AudioPD#

root@rb3gen2-core-kit:/tmp/Runner/suites/Multimedia/DSP_AudioPD# ./run.sh
[INFO] 1970-01-01 00:09:54 - -----------------------------------------------------------------------------------------
[INFO] 1970-01-01 00:09:54 - -------------------Starting DSP_AudioPD Testcase----------------------------
[INFO] 1970-01-01 00:09:54 - === Test Initialization ===
[INFO] 1970-01-01 00:09:54 - Checking dependencies: adsprpcd tr awk grep sleep find cat
[INFO] 1970-01-01 00:09:54 - === AudioPD FastRPC allocator pre-check ===
[INFO] 1970-01-01 00:09:54 - [audiopd] Non-secure ADSP FastRPC device present: /dev/fastrpc-adsp
[INFO] 1970-01-01 00:09:54 - [audiopd] ADSP remoteproc: /sys/class/remoteproc/remoteproc1 state=running
[INFO] 1970-01-01 00:09:54 - [audiopd] ADSP RPC remote heap symbol present: /proc/device-tree/__symbols__/adsp_rpc_remote_heap_mem
[INFO] 1970-01-01 00:09:54 - [audiopd] ADSP RPC remote heap reserved-memory node: /proc/device-tree/reserved-memory/adsp-rpc-remote-heap@9cb80000
[INFO] 1970-01-01 00:09:54 - [audiopd] ADSP RPC remote heap reg property present: /proc/device-tree/reserved-memory/adsp-rpc-remote-heap@9cb80000/reg
[INFO] 1970-01-01 00:09:54 - [audiopd] ADSP RPC remote heap symbol present: /sys/firmware/devicetree/base/__symbols__/adsp_rpc_remote_heap_mem
[INFO] 1970-01-01 00:09:54 - [audiopd] ADSP RPC remote heap reserved-memory node: /sys/firmware/devicetree/base/reserved-memory/adsp-rpc-remote-heap@9cb80000
[INFO] 1970-01-01 00:09:54 - [audiopd] ADSP RPC remote heap reg property present: /sys/firmware/devicetree/base/reserved-memory/adsp-rpc-remote-heap@9cb80000/reg
[PASS] 1970-01-01 00:09:54 - [audiopd] AudioPD FastRPC allocator prerequisites are available.
[INFO] 1970-01-01 00:09:55 - Process 'adsprpcd' is running.
[INFO] 1970-01-01 00:09:55 - Process 'adsprpcd' instances: 684 685
[INFO] 1970-01-01 00:09:55 - Process 'adsprpcd' PID 684 cmdline: /usr/bin/adsprpcd
[INFO] 1970-01-01 00:09:55 - Process 'adsprpcd' PID 685 cmdline: /usr/bin/adsprpcd audiopd
[INFO] 1970-01-01 00:09:56 - PID is 684
[INFO] 1970-01-01 00:09:56 - adsprpcd PID 684 wchan='poll_schedule_timeout.constprop.0' (accepted)
[INFO] 1970-01-01 00:09:56 - adsprpcd PID 685 wchan='poll_schedule_timeout.constprop.0' (accepted)
[PASS] 1970-01-01 00:09:56 - DSP_AudioPD : Test Passed
[INFO] 1970-01-01 00:09:56 - -------------------Completed DSP_AudioPD Testcase----------------------------
root@rb3gen2-core-kit:/tmp/Runner/suites/Multimedia/DSP_AudioPD#

[smuppand]

qcs615-adp: https://lava.infra.foundries.io/scheduler/job/188891

[smuppand]

Please refer to the lava job on QCS615-ride https://lava.infra.foundries.io/scheduler/job/190885#L2132 that includes the recent changes, and review the stdout output.

[vnarapar]

LGTM