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13 June 2022, 11:31:42 UTC
Revision c733cf83bbd2b0978456822cdac8c726085dcc14 authored by Preeti U Murthy on 02 July 2014, 03:49:35 UTC, committed by Benjamin Herrenschmidt on 11 July 2014, 02:55:06 UTC 
powerpc/powernv: Check for IRQHAPPENED before sleeping
 
Commit 8d6f7c5a: "powerpc/powernv: Make it possible to skip the IRQHAPPENED
check in power7_nap()" added code that prevents cpus from checking for
pending interrupts just before entering sleep state, which is wrong. These
interrupts are delivered during the soft irq disabled state of the cpu.

A cpu cannot enter any idle state with pending interrupts because they will
never be serviced until the next time the cpu is woken up by some other
interrupt. Its only then that the pending interrupts are replayed. This can result
in device timeouts or warnings about this cpu being stuck.

This patch fixes ths issue by ensuring that cpus check for pending interrupts
just before entering any idle state as long as they are not in the path of split
core operations.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
1 parent cd68098
History
Tip revision: c733cf83bbd2b0978456822cdac8c726085dcc14 authored by Preeti U Murthy on 02 July 2014, 03:49:35 UTC
powerpc/powernv: Check for IRQHAPPENED before sleeping
Tip revision: c733cf8
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