C++ (Cpp) VIOSerialAddInBuf示例

示例#1

文件： Buffer.c 项目： bonzini/kvm-guest-drivers-windows

// this procedure must be called with port InBuf spinlock held
SSIZE_T
VIOSerialFillReadBufLocked(
    IN PVIOSERIAL_PORT port,
    IN PVOID outbuf,
    IN SIZE_T count
)
{
    PPORT_BUFFER buf;
    NTSTATUS  status = STATUS_SUCCESS;

    TraceEvents(TRACE_LEVEL_VERBOSE, DBG_QUEUEING, "--> %s\n", __FUNCTION__);

    if (!count || !VIOSerialPortHasDataLocked(port))
        return 0;

    buf = port->InBuf;
    count = min(count, buf->len - buf->offset);

    RtlCopyMemory(outbuf, (PVOID)((LONG_PTR)buf->va_buf + buf->offset), count);

    buf->offset += count;

    if (buf->offset == buf->len)
    {
        port->InBuf = NULL;

        status = VIOSerialAddInBuf(GetInQueue(port), buf);
        if (!NT_SUCCESS(status))
        {
            TraceEvents(TRACE_LEVEL_ERROR, DBG_QUEUEING, "%s::%d  VIOSerialAddInBuf failed\n", __FUNCTION__, __LINE__);
        }
    }
    TraceEvents(TRACE_LEVEL_VERBOSE, DBG_QUEUEING, "<-- %s\n", __FUNCTION__);
    return count;
}

示例#2

文件： Control.c 项目： daynix/kvm-guest-drivers-windows

VOID
VIOSerialCtrlWorkHandler(
    IN WDFDEVICE Device
)
{
    struct virtqueue *vq;
    PPORT_BUFFER buf;
    UINT len;
    NTSTATUS  status = STATUS_SUCCESS;
    PPORTS_DEVICE pContext = GetPortsDevice(Device);

    TraceEvents(TRACE_LEVEL_VERBOSE, DBG_PNP, "--> %s\n", __FUNCTION__);

    vq = pContext->c_ivq;
    ASSERT(vq);

    WdfSpinLockAcquire(pContext->CInVqLock);
    while ((buf = virtqueue_get_buf(vq, &len)))
    {
        WdfSpinLockRelease(pContext->CInVqLock);
        buf->len = len;
        buf->offset = 0;
        VIOSerialHandleCtrlMsg(Device, buf);

        WdfSpinLockAcquire(pContext->CInVqLock);
        status = VIOSerialAddInBuf(vq, buf);
        if (!NT_SUCCESS(status))
        {
           TraceEvents(TRACE_LEVEL_ERROR, DBG_PNP, "%s::%d Error adding buffer to queue\n", __FUNCTION__, __LINE__);
           VIOSerialFreeBuffer(buf);
        }
    }
    TraceEvents(TRACE_LEVEL_VERBOSE, DBG_PNP, "<-- %s\n", __FUNCTION__);
    WdfSpinLockRelease(pContext->CInVqLock);
}

示例#3

文件： Device.c 项目： xjtuwjp/kvm-guest-drivers-windows

NTSTATUS
VIOSerialFillQueue(
    IN struct virtqueue *vq,
    IN WDFSPINLOCK Lock
)
{
    NTSTATUS     status = STATUS_SUCCESS;
    PPORT_BUFFER buf = NULL;

    TraceEvents(TRACE_LEVEL_VERBOSE, DBG_INIT, "--> %s\n", __FUNCTION__);

    for (;;)
    {
        buf = VIOSerialAllocateBuffer(PAGE_SIZE);
        if(buf == NULL)
        {
           TraceEvents(TRACE_LEVEL_ERROR, DBG_INIT, "VIOSerialAllocateBuffer failed\n");
           return STATUS_INSUFFICIENT_RESOURCES;
        }

        WdfSpinLockAcquire(Lock);
        status = VIOSerialAddInBuf(vq, buf);
        if(!NT_SUCCESS(status))
        {
           VIOSerialFreeBuffer(buf);
           WdfSpinLockRelease(Lock);
           break;
        }
        WdfSpinLockRelease(Lock);
    }
    TraceEvents(TRACE_LEVEL_VERBOSE, DBG_INIT, "<-- %s\n", __FUNCTION__);
    return STATUS_SUCCESS;
}

示例#4

文件： Port.c 项目： koizumimizuki/kvm-guest-drivers-windows

// this procedure must be called with port InBuf spinlock held
VOID
VIOSerialDiscardPortDataLocked(
    IN PVIOSERIAL_PORT port
)
{
    struct virtqueue *vq;
    PPORT_BUFFER buf = NULL;
    UINT len;
    NTSTATUS  status = STATUS_SUCCESS;
    UINT ret = 0;

    TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "--> %s\n", __FUNCTION__);

    vq = GetInQueue(port);

    if (port->InBuf)
    {
        buf = port->InBuf;
    }
    else if (vq)
    {
        buf = (PPORT_BUFFER)vq->vq_ops->get_buf(vq, &len);
    }

    while (buf)
    {
        status = VIOSerialAddInBuf(vq, buf);
        if(!NT_SUCCESS(status))
        {
           ++ret;
           VIOSerialFreeBuffer(buf);
        }
        buf = (PPORT_BUFFER)vq->vq_ops->get_buf(vq, &len);
    }
    port->InBuf = NULL;
    if (ret > 0)
    {
        TraceEvents(TRACE_LEVEL_ERROR, DBG_PNP, "%s::%d Error adding %u buffers back to queue\n",
                      __FUNCTION__, __LINE__, ret);
    }
    TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP,"<-- %s\n", __FUNCTION__);
}