Re: cxl: Do adapter fence check before handling afu interrupt

On Wed, 2016-11-16 at 14:09:33 UTC, Vaibhav Jain wrote:

If an afu interrupt is in flight when an eeh error is triggered the
control still reaches the function native_irq_multiplexed and the
PE-Handle read from the CXL_PSL_PEHandle_An register is 0xffff. The
function then erroneously assumes that the interrupt belonged to a
detached context and generates a warning with full stack dump in the
kernel log complaining:

"Unable to demultiplex CXL PSL IRQ for PE 65535 DSISR ffffffff DAR
ffffffff. (Possible AFU HW issue - was a term/remove acked with
outstanding transactions"

To fix this the patch adds new code to the function
native_irq_multiplexed function to compares the read value of register
CXL_PSL_PEHandle_An to ~0ULL. If true then logs a warning message
saying that the interrupt is being ignored and returns IRQ_HANDLED from
the irq handler.

Reviewed-by: Andrew Donnellan <redacted>
Acked-by: Frederic Barrat <redacted>
Acked-by: Ian Munsie <redacted>
Signed-off-by: Vaibhav Jain <redacted>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/abf051be684be768c1ee079514f4d0

cheers