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Subject: [PATCH] pci: use msix_config instead of config_msix_vector
The struct virtio_pci_common_cfg field is called msix_config but the text refers to this field as config_msix_vector. This is confusing. Rename config_msix_vector to msix_config. Although config_msix_vector is arguably a clearer name, existing code using Linux virtio_pci.h uses msix_config so let's stick with that. Fixes: https://github.com/oasis-tcs/virtio-spec/issues/41 Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- Note that Paolo already submitted a patch for the other approach and I even reviewed it: https://lists.oasis-open.org/archives/virtio/201903/msg00073.html Either way, let's merge a fix! --- content.tex | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/content.tex b/content.tex index 679391e..ae0b790 100644 --- a/content.tex +++ b/content.tex @@ -843,7 +843,7 @@ \subsubsection{Common configuration structure layout}\label{sec:Virtio Transport The driver writes this to accept feature bits offered by the device. Driver Feature Bits selected by \field{driver_feature_select}. -\item[\field{config_msix_vector}] +\item[\field{msix_config}] The driver sets the Configuration Vector for MSI-X. \item[\field{num_queues}] @@ -1202,7 +1202,7 @@ \subsubsection{Legacy Interfaces: A Note on PCI Device Layout}\label{sec:Virtio \hline Read/Write & R+W & R+W \\ \hline -Purpose (MSI-X) & \field{config_msix_vector} & \field{queue_msix_vector} \\ +Purpose (MSI-X) & \field{msix_config} & \field{queue_msix_vector} \\ \hline \end{tabular} @@ -1323,11 +1323,11 @@ \subsubsection{Device Initialization}\label{sec:Virtio Transport Options / Virti \paragraph{MSI-X Vector Configuration}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / MSI-X Vector Configuration} When MSI-X capability is present and enabled in the device -(through standard PCI configuration space) \field{config_msix_vector} and \field{queue_msix_vector} are used to map configuration change and queue +(through standard PCI configuration space) \field{msix_config} and \field{queue_msix_vector} are used to map configuration change and queue interrupts to MSI-X vectors. In this case, the ISR Status is unused. Writing a valid MSI-X Table entry number, 0 to 0x7FF, to -\field{config_msix_vector}/\field{queue_msix_vector} maps interrupts triggered +\field{msix_config}/\field{queue_msix_vector} maps interrupts triggered by the configuration change/selected queue events respectively to the corresponding MSI-X vector. To disable interrupts for an event type, the driver unmaps this event by writing a special NO_VECTOR @@ -1359,7 +1359,7 @@ \subsubsection{Device Initialization}\label{sec:Virtio Transport Options / Virti Device MUST support unmapping any event type. The device MUST return vector mapped to a given event, -(NO_VECTOR if unmapped) on read of \field{config_msix_vector}/\field{queue_msix_vector}. +(NO_VECTOR if unmapped) on read of \field{msix_config}/\field{queue_msix_vector}. The device MUST have all queue and configuration change events are unmapped upon reset. @@ -1367,7 +1367,7 @@ \subsubsection{Device Initialization}\label{sec:Virtio Transport Options / Virti unless it is impossible for the device to satisfy the mapping request. Devices MUST report mapping failures by returning the NO_VECTOR value when the relevant -\field{config_msix_vector}/\field{queue_msix_vector} field is read. +\field{msix_config}/\field{queue_msix_vector} field is read. \drivernormative{\subparagraph}{MSI-X Vector Configuration}{Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / MSI-X Vector Configuration} @@ -1485,9 +1485,9 @@ \subsubsection{Notification of Device Configuration Changes}\label{sec:Virtio Tr \item If MSI-X capability is enabled: \begin{enumerate} - \item If \field{config_msix_vector} is not NO_VECTOR, + \item If \field{msix_config} is not NO_VECTOR, request the appropriate MSI-X interrupt message for the - device, \field{config_msix_vector} sets the MSI-X Table entry + device, \field{msix_config} sets the MSI-X Table entry number. \end{enumerate} \end{itemize} @@ -1497,7 +1497,7 @@ \subsubsection{Notification of Device Configuration Changes}\label{sec:Virtio Tr \devicenormative{\paragraph}{Notification of Device Configuration Changes}{Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes} -If MSI-X capability is enabled and \field{config_msix_vector} is +If MSI-X capability is enabled and \field{msix_config} is NO_VECTOR, the device MUST NOT deliver an interrupt for device configuration space changes. @@ -1527,7 +1527,7 @@ \subsubsection{Driver Handling Interrupts}\label{sec:Virtio Transport Options / device, to see if any progress has been made by the device which requires servicing. \item - If the MSI-X vector is equal to \field{config_msix_vector}, + If the MSI-X vector is equal to \field{msix_config}, re-examine the configuration space to see what changed. \end{itemize} \end{itemize} -- 2.21.0
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