cxl: Ensure PSL interrupt is configured for contexts with no AFU IRQs

Michael Ellerman mpe at
Wed May 11 07:48:41 AEST 2016

On Wed, 2016-04-05 at 04:52:58 UTC, Ian Munsie wrote:
> From: Ian Munsie <imunsie at>
> In the cxl kernel API, it is possible to create a context and start it
> without allocating any interrupts. Since we assign or allocate the PSL
> interrupt when allocating AFU interrupts this will lead to a situation
> where we start the context with no means to take any faults.
> The user API is not affected as it always goes through the cxl interrupt
> allocation code paths and will have the PSL interrupt allocated or
> assigned, even if no AFU interrupts were requested.
> This checks that at least one interrupt is configured at the time of
> attach, and if not it will assign the multiplexed PSL interrupt for
> powernv, or allocate a single interrupt for PowerVM.
> Signed-off-by: Ian Munsie <imunsie at>
> Reviewed-by: Frederic Barrat <fbarrat at>

Applied to powerpc next, thanks.


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