Ankit Soni d2a0cac105
iommu/amd: move wait_on_sem() out of spinlock ...
With iommu.strict=1, the existing completion wait path can cause soft
lockups under stressed environment, as wait_on_sem() busy-waits under the
spinlock with interrupts disabled.
Move the completion wait in iommu_completion_wait() out of the spinlock.
wait_on_sem() only polls the hardware-updated cmd_sem and does not require
iommu->lock, so holding the lock during the busy wait unnecessarily
increases contention and extends the time with interrupts disabled.
Signed-off-by: Ankit Soni <Ankit.Soni@amd.com >
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com >
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com >
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d2a0cac105