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End-of-interrupt (EOI) handling is missing for RAS interrupts
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Resolved: I agree with comment by odeprez; the EOI belongs in the INDIVIDUAL RAS error handler since not all RAS errors involve the interrupt controller (as in a CPU exception).

Question: where does the EOI belong for a RAS interrupt? Does it belong In the [common] RAS priority handler or in the [individual] RAS error handler?
Currently, the RAS priority handler, 'ras_interrupt_handler()', does not perform EOI processing (i.e. it does not invoke 'plat_ic_end_of_interrupt()' after calling the [individual] RAS error handler).

I am encountering a problem when I dispatch an SDEI event from a RAS error handler. Although the SDEI event completes and returns to the RAS error handler, the system subsequently hangs.
If I invoke 'plat_ic_end_of_interrupt()' after the RAS error handler completes, the system operates normally.
I would expect that the platform EOI processing be invoked from the [common] RAS priority handler, rather than requiring it to be included in each and every RAS error handler.

Event Timeline

rickdic created this task.Dec 23 2019, 6:32 PM

Hi,

I'm not too much versed into RAS error handling, so please take my explanation below with care.
I suggest you send the question to the TF-A ML to get more sensible insights.

From what I understand, EOI should be done from the platform RAS handler (or "individual handler" as you mention) .

When looking at the platform sample plat/arm/css/sgi/sgi_ras.c,
plat_ic_end_of_interrupt is called from sgi_ras_intr_handler.

I suspect not all RAS errors require EOI, such as when the generated error is a CPU exception.
And so a reason EOI might not be done from common RAS handler.

Regards,
Olivier.

HI Rickdic,
Could you please send this query to the TF-A mailing list ?

rickdic closed this task as Resolved.Feb 15 2020, 10:01 PM
rickdic updated the task description. (Show Details)

To overcome this problem, it is necessary to determine the cause of the lack of EOI processing for the RAS interrupt and correct the error in the corresponding software or hardware. This often requires thorough examination and analysis of the source code, interrupt handlers and related systems. aa route planner

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sumannn650 added a comment.EditedOct 13 2023, 12:50 PM

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