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Subject: [PATCH 1/1] virtio-ccw: clarifications
- further qualify bit numbering - specify summary indicator contents - drop early printk spec; it is only a hack that was never used upstream Reported-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> --- content.tex | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/content.tex b/content.tex index 803615d..0a94c07 100644 --- a/content.tex +++ b/content.tex @@ -2174,7 +2174,8 @@ summary_indicator contains the guest address of the 8 bit summary indicator. indicator contains the guest address of an area wherin the indicators for the devices are contained, starting at bit_nr, one bit per -virtqueue of the device. Bit numbers start at the left. +virtqueue of the device. Bit numbers start at the left, i.e. the most +significant bit in the first byte is assigned the bit number 0. isc contains the I/O interruption subclass to be used for the adapter I/O interrupt. It may be different from the isc used by the proxy virtio-ccw device's subchannel. @@ -2224,7 +2225,7 @@ host->guest notification about virtqueue activity. For notifying the driver of virtqueue buffers, the device sets the bit in the guest-provided indicator area at the corresponding offset. -The guest-provided summary indicator is also set. An adapter I/O +The guest-provided summary indicator is set to 0x01. An adapter I/O interrupt for the corresponding interruption subclass is generated. The device SHOULD only generate an adapter I/O interrupt if the summary indicator had not been set prior to notification. The driver @@ -2273,11 +2274,6 @@ should be passed in GPR4 for the next notification: info->cookie); \end{lstlisting} -\subsubsection{Early printk for Virtio Consoles}\label{sec:Virtio Transport Options / Virtio over channel I/O / Device Operation / Early printk for Virtio Consoles} - -For the early printk mechanism, diagnose 0x500 with subcode 0 is -used. - \subsubsection{Resetting Devices}\label{sec:Virtio Transport Options / Virtio over channel I/O / Device Operation / Resetting Devices} In order to reset a device, a driver sends the -- 1.7.9.5
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