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authorAlex Williamson <alex.williamson@redhat.com>2015-04-28 19:23:30 +0300
committerAlex Williamson <alex.williamson@redhat.com>2015-05-01 23:00:53 +0300
commit5f55d2ae699d1756ad6132786c7f9c27dc456b66 (patch)
treec04cd92c5ce7fa91c42d87fbd739b500bf046c51 /drivers/vfio
parentb787f68c36d49bb1d9236f403813641efa74a031 (diff)
downloadlinux-5f55d2ae699d1756ad6132786c7f9c27dc456b66.tar.xz
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>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/pci/vfio_pci.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 69fab0fd15ae..e9851add6f4e 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -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);