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Code Issues Releases Wiki Activity

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: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2015-04-28 10:23:30 -06:00
parent b787f68c36
commit 5f55d2ae69
1 changed files with 7 additions and 1 deletions
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8
drivers/vfio/pci/vfio_pci.c
View File

@ -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);