FROMLIST: misc: fastrpc: fix ADSP duplicate session creation - #1027
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Vinayak Katoch (quic-vkatoch) wants to merge 3 commits into
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FROMLIST: misc: fastrpc: fix ADSP duplicate session creation#1027Vinayak Katoch (quic-vkatoch) wants to merge 3 commits into
Vinayak Katoch (quic-vkatoch) wants to merge 3 commits into
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…form_populate of_platform_populate() only guarantees that child devices are registered, not that their probes have completed before it returns. This creates a window where fastrpc_cb_init() may not have run for all context bank nodes, leaving the channel context partially initialised. Iterate over the child device tree nodes directly, initialising each qcom,fastrpc-compute-cb device synchronously. This ensures all context banks are fully initialised before fastrpc_rpmsg_probe() returns. Since fastrpc_cb_driver is no longer needed as an independent platform driver, remove it along with its match table and remove callback. Set OF_POPULATED_BUS on the rpmsg node so that of_platform_depopulate() correctly removes the manually created CB devices on teardown. Link: https://lore.kernel.org/all/20260826-dup-sessions-v4-1-35555d2bfed4@oss.qualcomm.com/ Signed-off-by: Vinayak Katoch <vinayak.katoch@oss.qualcomm.com>
…driver For ADSP, only a limited number of FastRPC context banks (CBs) are available. Each CB supports a single session, which means only a few processes can run on ADSP simultaneously. If all sessions are consumed by fastrpc daemons, no session remains available when a user application starts, causing the application to fail. To work around this, qcom,nsessions = <5> was set in DT to duplicate sessions inline during fastrpc_cb_init(). This policy does not belong in DT and should be handled at the driver level instead. Remove the qcom,nsessions DT property read and the per-CB duplication logic from fastrpc_cb_init(). After all context banks have been initialised in fastrpc_rpmsg_probe(), append FASTRPC_DUP_SESSIONS (4) copies of the last session for the ADSP domain. Link: https://lore.kernel.org/all/20260826-dup-sessions-v4-2-35555d2bfed4@oss.qualcomm.com/ Signed-off-by: Vinayak Katoch <vinayak.katoch@oss.qualcomm.com>
The qcom,nsessions property was used to duplicate FastRPC sessions inline during context bank initialisation. Session duplication is now handled at the driver level, making this DT property redundant. Mark it deprecated. Link: https://lore.kernel.org/all/20260826-dup-sessions-v4-3-35555d2bfed4@oss.qualcomm.com/ Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Signed-off-by: Vinayak Katoch <vinayak.katoch@oss.qualcomm.com>
Vinayak Katoch (quic-vkatoch)
requested review from
a team,
Komal Bajaj (Komal-Bajaj),
Mukesh Ojha (mukeshojha-linux) and
Rajendra (rrnayak)
August 27, 2026 10:53
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Link: https://lore.kernel.org/all/20260826-dup-sessions-v4-0-35555d2bfed4@oss.qualcomm.com/
CRs-Fixed: 4508505