diff options
author | Halil Pasic <pasic@linux.ibm.com> | 2018-06-25 14:21:30 +0200 |
---|---|---|
committer | Michael S. Tsirkin <mst@redhat.com> | 2018-10-19 17:29:28 -0400 |
commit | 9ded7d7d5edbd276264d513236ae6cbe32e62611 (patch) | |
tree | c067c968a46107345ee9d9883e13be2a5afc8ac1 /content.tex | |
parent | c47839298c3be62a64ab05caf2a08fd36f4cb61b (diff) | |
download | virtio-spec-9ded7d7d5edbd276264d513236ae6cbe32e62611.tar.gz |
pci: map common notifications terminology to PCI
The various notifications are introduced and specified in the common
(i.e. transport agnostic) portion of this specification. How
notifications are realised for a given transport is something each
transport has to specify.
Let's make the relationship between the PCI terms and the common
terms more obvious.
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'content.tex')
-rw-r--r-- | content.tex | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/content.tex b/content.tex index 4103aba..4dd751c 100644 --- a/content.tex +++ b/content.tex @@ -941,7 +941,7 @@ causes the device to de-assert the interrupt. In this way, driver read of ISR status causes the device to de-assert an interrupt. -See sections \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Virtqueue Interrupts From The Device} and \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes} for how this is used. +See sections \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Used Buffer Notifications} and \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes} for how this is used. \devicenormative{\paragraph}{ISR status capability}{Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / ISR status capability} @@ -1306,14 +1306,15 @@ enough to ensure that the separate parts of the virtqueue are on separate cache lines. }. There was no mechanism to negotiate the queue size. -\subsubsection{Notifying The Device}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notifying The Device} +\subsubsection{Available Buffer Notifications}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Available Buffer Notifications} -The driver notifies the device by writing the 16-bit virtqueue index +The driver sends an available buffer notification to the device by writing +the 16-bit virtqueue index of this virtqueue to the Queue Notify address. See \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Notification capability} for how to calculate this address. -\subsubsection{Virtqueue Interrupts From The Device}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Virtqueue Interrupts From The Device} +\subsubsection{Used Buffer Notifications}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Used Buffer Notifications} -If an interrupt is necessary for a virtqueue, the device would typically act as follows: +If a used buffer notification is necessary for a virtqueue, the device would typically act as follows: \begin{itemize} \item If MSI-X capability is disabled: @@ -1332,7 +1333,7 @@ If an interrupt is necessary for a virtqueue, the device would typically act as \end{enumerate} \end{itemize} -\devicenormative{\paragraph}{Virtqueue Interrupts From The Device}{Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Virtqueue Interrupts From The Device} +\devicenormative{\paragraph}{Used Buffer Notifications}{Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Used Buffer Notifications} If MSI-X capability is enabled and \field{queue_msix_vector} is NO_VECTOR for a virtqueue, the device MUST NOT deliver an interrupt |