Re: [PATCH 5/7] dt-bindings: remoteproc: qcom,pas: Add hwlocks

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On 5/19/2024 10:36 AM, Krzysztof Kozlowski wrote:
On 17/05/2024 00:58, Chris Lew wrote:
Add hwlocks property to describe the hwspinlock that remoteproc can try
to bust on behalf of the remoteproc's smem.

Sorry, as you wrote, the lock is part of smem, not here. Drivers do not
crash, so if your crashes as you imply in the cover letter, then first
fix the driver.


Hi Krzysztof,

Sorry for the confusion, I dont think I meant that the smem driver will ever crash. The referred to crash in the cover letter is a crash in the firmware running on the remoteproc. The remoteproc could crash for any unexpected reason, related or unrelated to smem, while holding the tcsr mutex. I want to ensure that all resources that a remoteproc might be using are released as part of remoteproc stop.

The SMEM driver manages the lock/unlock operations on the tcsr mutex from the Linux CPU's perspective. This case is for cleaning up from the remote side's perspective.

In this case it's the hwspinlock used to synchronize SMEM, but it's conceivable that firmware running on the remoteproc has additional locks that need to be busted in order for the system to continue executing until the firmware is reinitialized.

We did consider tying this to the SMEM instance, but the entitiy relating to firmware is the remoteproc instance.

Best regards,
Krzysztof





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