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Commit 5f55d2ae authored by Alex Williamson's avatar Alex Williamson
Browse files

vfio-pci: Log device requests more verbosely 



Log some clues indicating whether the user is receiving device
request interfaces or not listening.  This can help indicate why a
driver unbind is blocked or explain why QEMU automatically unplugged
a device from the VM.

Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent b787f68c

drivers/vfio/pci/vfio_pci.c

+7 −1
Original line number Diff line number Diff line
@@ -907,8 +907,14 @@ static void vfio_pci_request(void *device_data, unsigned int count) 
	mutex_lock(&vdev->igate);



	if (vdev->req_trigger) {

		dev_dbg(&vdev->pdev->dev, "Requesting device from user\n");

		if (!(count % 10))

			dev_notice_ratelimited(&vdev->pdev->dev,

				"Relaying device request to user (#%u)\n",

				count);

		eventfd_signal(vdev->req_trigger, 1);

	} else if (count == 0) {

		dev_warn(&vdev->pdev->dev,

			"No device request channel registered, blocked until released by user\n");

	}



	mutex_unlock(&vdev->igate);