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SubjectNVMe Poll CQ on timeout
Date
Hi,

We are testing NVMe cards on ARM64 platform, the card uses legacy interrupts.
Intermittently we are hitting following case in drivers/nvme/host/pci.c
/*
* Did we miss an interrupt?
*/
if (__nvme_poll(nvmeq, req->tag)) {
dev_warn(dev->ctrl.device,
"I/O %d QID %d timeout, completion polled\n",
req->tag, nvmeq->qid);
return BLK_EH_HANDLED;
}

Can anyone tell when does nvme_timeout gets invoked ?
What does "Did we miss an interrupt mean" ? Does it mean host missing
to service a interrupt raised by EP card ?

Regards,
Bharat


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