iommu/arm-smmu-v3: disable stall for quiet_cd

In the stall model, invalid transactions were expected to be
stalled and aborted by the IOPF handler.

However, when killing a test case with a huge amount of data, the
accelerator streamline can not stop until all data is consumed
even if the page fault handler reports errors. As a result, the
kill may take a long time, about 10 seconds with numerous iopf
interrupts.

So disable stall for quiet_cd in the non-force stall model, since
force stall model (STALL_MODEL==0b10) requires CD.S must be 1.

Signed-off-by: Zhangfei Gao <[email protected]>
Signed-off-by: Wenkai Lin <[email protected]>
Suggested-by: Jean-Philippe Brucker <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Jean-Philippe Brucker <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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