/* called when an rx buffer is used, and it's time to digest a message */
static void rpmsg_recv_done(struct virtqueue *rvq)
{
struct virtproc_info *vrp = rvq->vdev->priv;
struct device *dev = &rvq->vdev->dev;
struct rpmsg_hdr *msg;
unsigned int len, msgs_received = 0;
int err;
msg = virtqueue_get_buf(rvq, &len);
if (!msg) {
dev_err(dev, "uhm, incoming signal, but no used buffer ?\n");
return;
}
while (msg) {
err = rpmsg_recv_single(vrp, dev, msg, len);
if (err)
break;
msgs_received++;
msg = virtqueue_get_buf(rvq, &len);
};
dev_dbg(dev, "Received %u messages\n", msgs_received);
/* tell the remote processor we added another available rx buffer */
if (msgs_received)
virtqueue_kick(vrp->rvq);
}
VOID
BalloonInterruptDpc(
IN WDFINTERRUPT WdfInterrupt,
IN WDFOBJECT WdfDevice
)
{
unsigned int len;
PDEVICE_CONTEXT devCtx = GetDeviceContext(WdfDevice);
BOOLEAN bHostAck = FALSE;
UNREFERENCED_PARAMETER( WdfInterrupt );
TraceEvents(TRACE_LEVEL_INFORMATION, DBG_DPC, "--> %s\n", __FUNCTION__);
if (virtqueue_get_buf(devCtx->InfVirtQueue, &len))
{
bHostAck = TRUE;
}
if (virtqueue_get_buf(devCtx->DefVirtQueue, &len))
{
bHostAck = TRUE;
}
if(bHostAck)
{
KeSetEvent (&devCtx->HostAckEvent, IO_NO_INCREMENT, FALSE);
}
if (devCtx->StatVirtQueue &&
virtqueue_get_buf(devCtx->StatVirtQueue, &len))
{
WDFREQUEST request = devCtx->PendingWriteRequest;
devCtx->HandleWriteRequest = TRUE;
if ((request != NULL) &&
(WdfRequestUnmarkCancelable(request) != STATUS_CANCELLED))
{
NTSTATUS status;
PVOID buffer;
size_t length = 0;
devCtx->PendingWriteRequest = NULL;
status = WdfRequestRetrieveInputBuffer(request, 0, &buffer, &length);
if (!NT_SUCCESS(status))
{
length = 0;
}
WdfRequestCompleteWithInformation(request, status, length);
}
}
if(devCtx->Thread)
{
KeSetEvent(&devCtx->WakeUpThread, 0, FALSE);
}
}
static void req_done(struct virtqueue *vq)
{
struct virtio_chan *chan = vq->vdev->priv;
struct p9_fcall *rc;
unsigned int len;
struct p9_req_t *req;
unsigned long flags;
p9_debug(P9_DEBUG_TRANS, ": request done\n");
while (1) {
spin_lock_irqsave(&chan->lock, flags);
rc = virtqueue_get_buf(chan->vq, &len);
if (rc == NULL) {
spin_unlock_irqrestore(&chan->lock, flags);
break;
}
chan->ring_bufs_avail = 1;
spin_unlock_irqrestore(&chan->lock, flags);
/* Wakeup if anyone waiting for VirtIO ring space. */
wake_up(chan->vc_wq);
p9_debug(P9_DEBUG_TRANS, ": rc %p\n", rc);
p9_debug(P9_DEBUG_TRANS, ": lookup tag %d\n", rc->tag);
req = p9_tag_lookup(chan->client, rc->tag);
req->status = REQ_STATUS_RCVD;
p9_client_cb(chan->client, req);
}
}
static int virtio_crypto_alg_ablkcipher_close_session(
struct virtio_crypto_ablkcipher_ctx *ctx,
int encrypt)
{
struct scatterlist outhdr, status_sg, *sgs[2];
unsigned int tmp;
struct virtio_crypto_destroy_session_req *destroy_session;
struct virtio_crypto *vcrypto = ctx->vcrypto;
int err;
unsigned int num_out = 0, num_in = 0;
spin_lock(&vcrypto->ctrl_lock);
vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
/* Pad ctrl header */
vcrypto->ctrl.header.opcode =
cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
/* Set the default virtqueue id to 0 */
vcrypto->ctrl.header.queue_id = 0;
destroy_session = &vcrypto->ctrl.u.destroy_session;
if (encrypt)
destroy_session->session_id =
cpu_to_le64(ctx->enc_sess_info.session_id);
else
destroy_session->session_id =
cpu_to_le64(ctx->dec_sess_info.session_id);
sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
sgs[num_out++] = &outhdr;
/* Return status and session id back */
sg_init_one(&status_sg, &vcrypto->ctrl_status.status,
sizeof(vcrypto->ctrl_status.status));
sgs[num_out + num_in++] = &status_sg;
err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
num_in, vcrypto, GFP_ATOMIC);
if (err < 0) {
spin_unlock(&vcrypto->ctrl_lock);
return err;
}
virtqueue_kick(vcrypto->ctrl_vq);
while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
!virtqueue_is_broken(vcrypto->ctrl_vq))
cpu_relax();
if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
spin_unlock(&vcrypto->ctrl_lock);
pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
vcrypto->ctrl_status.status,
destroy_session->session_id);
return -EINVAL;
}
spin_unlock(&vcrypto->ctrl_lock);
return 0;
}
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);
}
/*
* Host sent us a control message.
* Called in interrupt context!
*/
static void control_in_intr(struct virtqueue *vq)
{
struct crypto_device *crdev;
struct crypto_vq_buffer *buf;
unsigned int len;
debug("Entering\n");
crdev = vq->vdev->priv;
while ((buf = virtqueue_get_buf(vq, &len))) {
buf->len = len;
buf->offset = 0;
handle_control_message(crdev, buf);
spin_lock_irq(&crdev->c_lock);
if (add_inbuf(crdev->c_ivq, buf) < 0) {
printk(KERN_WARNING "Error adding buffer to queue\n");
free_buf(buf);
}
spin_unlock_irq(&crdev->c_lock);
}
debug("Leaving\n");
}
static void virtblk_done(struct virtqueue *vq)
{
struct virtio_blk *vblk = vq->vdev->priv;
bool req_done = false;
int qid = vq->index;
struct virtblk_req *vbr;
unsigned long flags;
unsigned int len;
spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
do {
virtqueue_disable_cb(vq);
while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
blk_mq_complete_request(vbr->req, vbr->req->errors);
req_done = true;
}
if (unlikely(virtqueue_is_broken(vq)))
break;
} while (!virtqueue_enable_cb(vq));
/* In case queue is stopped waiting for more buffers. */
if (req_done)
blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
}
static void rpmsg_recv_done(struct virtqueue *rvq)
{
struct rpmsg_hdr *msg;
unsigned int len;
struct rpmsg_endpoint *ept;
struct scatterlist sg;
unsigned long offset;
void *sim_addr;
struct virtproc_info *vrp = rvq->vdev->priv;
struct device *dev = &rvq->vdev->dev;
int err;
/* if fail to acquire the lock, remove stage is happening, then just return */
if(!mutex_trylock(&vrp->rm_lock))
return;
/* make sure the descriptors are updated before reading */
rmb();
msg = virtqueue_get_buf(rvq, &len);
if (!msg) {
dev_err(dev, "uhm, incoming signal, but no used buffer ?\n");
return;
}
dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Unused: %d\n",
msg->src, msg->dst, msg->len,
msg->flags, msg->unused);
#if 0
print_hex_dump(KERN_DEBUG, "rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
msg, sizeof(*msg) + msg->len, true);
#endif
/* fetch the callback of the appropriate user */
spin_lock(&vrp->endpoints_lock);
ept = idr_find(&vrp->endpoints, msg->dst);
spin_unlock(&vrp->endpoints_lock);
if (ept && ept->cb)
ept->cb(ept->rpdev, msg->data, msg->len, ept->priv, msg->src);
else
dev_warn(dev, "msg received with no recepient\n");
/* add the buffer back to the remote processor's virtqueue */
offset = ((unsigned long) msg) - ((unsigned long) vrp->rbufs);
sim_addr = vrp->sim_base + offset;
sg_init_one(&sg, sim_addr, sizeof(*msg) + len);
err = virtqueue_add_buf_gfp(vrp->rvq, &sg, 0, 1, msg, GFP_KERNEL);
if (err < 0) {
dev_err(dev, "failed to add a virtqueue buffer: %d\n", err);
return;
}
/* descriptors must be written before kicking remote processor */
wmb();
/* tell the remote processor we added another available rx buffer */
virtqueue_kick(vrp->rvq);
mutex_unlock(&vrp->rm_lock);
}
static void random_recv_done(struct virtqueue *vq)
{
/* We can get spurious callbacks, e.g. shared IRQs + virtio_pci. */
if (!virtqueue_get_buf(vq, &data_avail))
return;
complete(&have_data);
}
/* called when an rx buffer is used, and it's time to digest a message */
static void rpmsg_recv_done(struct virtqueue *rvq)
{
struct rpmsg_hdr *msg;
unsigned int len;
struct rpmsg_endpoint *ept;
struct scatterlist sg;
struct virtproc_info *vrp = rvq->vdev->priv;
struct device *dev = &rvq->vdev->dev;
int err;
msg = virtqueue_get_buf(rvq, &len);
if (!msg) {
dev_err(dev, "uhm, incoming signal, but no used buffer ?\n");
return;
}
dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n",
msg->src, msg->dst, msg->len,
msg->flags, msg->reserved);
#if 0
print_hex_dump(KERN_DEBUG, "rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
msg, sizeof(*msg) + msg->len, true);
#endif
/*
* We currently use fixed-sized buffers, so trivially sanitize
* the reported payload length.
*/
if (len > RPMSG_BUF_SIZE ||
msg->len > (len - sizeof(struct rpmsg_hdr))) {
dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg->len);
return;
}
/* use the dst addr to fetch the callback of the appropriate user */
mutex_lock(&vrp->endpoints_lock);
ept = idr_find(&vrp->endpoints, msg->dst);
mutex_unlock(&vrp->endpoints_lock);
if (ept && ept->cb)
ept->cb(ept->rpdev, msg->data, msg->len, ept->priv, msg->src);
else
dev_warn(dev, "msg received with no recepient\n");
/* publish the real size of the buffer */
sg_init_one(&sg, msg, RPMSG_BUF_SIZE);
/* add the buffer back to the remote processor's virtqueue */
err = virtqueue_add_buf(vrp->rvq, &sg, 0, 1, msg, GFP_KERNEL);
if (err < 0) {
dev_err(dev, "failed to add a virtqueue buffer: %d\n", err);
return;
}
/* tell the remote processor we added another available rx buffer */
virtqueue_kick(vrp->rvq);
}
VOID VIOSerialReclaimConsumedBuffers(IN PVIOSERIAL_PORT Port)
{
WDFREQUEST request;
PSINGLE_LIST_ENTRY iter;
PVOID buffer;
UINT len;
struct virtqueue *vq = GetOutQueue(Port);
TraceEvents(TRACE_LEVEL_VERBOSE, DBG_QUEUEING, "--> %s\n", __FUNCTION__);
if (vq)
{
while ((buffer = virtqueue_get_buf(vq, &len)) != NULL)
{
if (Port->PendingWriteRequest != NULL)
{
request = Port->PendingWriteRequest;
Port->PendingWriteRequest = NULL;
if (WdfRequestUnmarkCancelable(request) != STATUS_CANCELLED)
{
WdfRequestCompleteWithInformation(request, STATUS_SUCCESS,
(size_t)WdfRequestGetInformation(request));
}
else
{
TraceEvents(TRACE_LEVEL_INFORMATION, DBG_QUEUEING,
"Request %p was cancelled.\n", request);
}
}
iter = &Port->WriteBuffersList;
while (iter->Next != NULL)
{
PWRITE_BUFFER_ENTRY entry = CONTAINING_RECORD(iter->Next,
WRITE_BUFFER_ENTRY, ListEntry);
if (buffer == entry->Buffer)
{
iter->Next = entry->ListEntry.Next;
ExFreePoolWithTag(buffer, VIOSERIAL_DRIVER_MEMORY_TAG);
ExFreePoolWithTag(entry, VIOSERIAL_DRIVER_MEMORY_TAG);
}
else
{
iter = iter->Next;
}
};
Port->OutVqFull = FALSE;
}
}
TraceEvents(TRACE_LEVEL_VERBOSE, DBG_QUEUEING, "<-- %s Full: %d\n",
__FUNCTION__, Port->OutVqFull);
}
static void random_recv_done(struct virtqueue *vq)
{
struct virtrng_info *vi = vq->vdev->priv;
/* We can get spurious callbacks, e.g. shared IRQs + virtio_pci. */
if (!virtqueue_get_buf(vi->vq, &vi->data_avail))
return;
complete(&vi->have_data);
}
/* Free consumed buffers. */
void reclaim_consumed_buffers(struct crypto_device *crdev)
{
void *buf;
unsigned int len;
debug("Entering\n");
while ((buf = virtqueue_get_buf(crdev->ovq, &len)))
kfree(buf);
debug("Leaving\n");
}
// 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)virtqueue_get_buf(vq, &len);
}
while (buf)
{
status = VIOSerialAddInBuf(vq, buf);
if(!NT_SUCCESS(status))
{
++ret;
VIOSerialFreeBuffer(buf);
}
buf = (PPORT_BUFFER)virtqueue_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__);
}
static void random_recv_done(struct virtqueue *vq)
{
unsigned int len;
/* We can get spurious callbacks, e.g. shared IRQs + virtio_pci. */
if (!virtqueue_get_buf(vq, &len))
return;
data_left += len;
complete(&have_data);
}
/* This is invoked whenever the remote processor completed processing
* a TX msg we just sent, and the buffer is put back to the used ring.
*/
static void cfv_release_used_buf(struct virtqueue *vq_tx)
{
struct cfv_info *cfv = vq_tx->vdev->priv;
unsigned long flags;
BUG_ON(vq_tx != cfv->vq_tx);
for (;;) {
unsigned int len;
struct buf_info *buf_info;
/* Get used buffer from used ring to recycle used descriptors */
spin_lock_irqsave(&cfv->tx_lock, flags);
buf_info = virtqueue_get_buf(vq_tx, &len);
spin_unlock_irqrestore(&cfv->tx_lock, flags);
/* Stop looping if there are no more buffers to free */
if (!buf_info)
break;
free_buf_info(cfv, buf_info);
/* watermark_tx indicates if we previously stopped the tx
* queues. If we have enough free stots in the virtio ring,
* re-establish memory reserved and open up tx queues.
*/
if (cfv->vq_tx->num_free <= cfv->watermark_tx)
continue;
/* Re-establish memory reserve */
if (cfv->reserved_mem == 0 && cfv->genpool)
cfv->reserved_mem =
gen_pool_alloc(cfv->genpool,
cfv->reserved_size);
/* Open up the tx queues */
if (cfv->reserved_mem) {
cfv->watermark_tx =
virtqueue_get_vring_size(cfv->vq_tx);
netif_tx_wake_all_queues(cfv->ndev);
/* Buffers are recycled in cfv_netdev_tx, so
* disable notifications when queues are opened.
*/
virtqueue_disable_cb(cfv->vq_tx);
++cfv->stats.tx_flow_on;
} else {
/* if no memory reserve, wait for more free slots */
WARN_ON(cfv->watermark_tx >
virtqueue_get_vring_size(cfv->vq_tx));
cfv->watermark_tx +=
virtqueue_get_vring_size(cfv->vq_tx) / 4;
}
}
}
static void virtinput_recv_status(struct virtqueue *vq)
{
struct virtio_input *vi = vq->vdev->priv;
struct virtio_input_event *stsbuf;
unsigned long flags;
unsigned int len;
spin_lock_irqsave(&vi->lock, flags);
while ((stsbuf = virtqueue_get_buf(vi->sts, &len)) != NULL)
kfree(stsbuf);
spin_unlock_irqrestore(&vi->lock, flags);
}
/*
* Send a buffer to the output virtqueue of the given crypto_device.
* If nonblock is false wait until the host acknowledges the data receive.
*/
ssize_t send_buf(struct crypto_device *crdev, void *in_buf, size_t in_count,
bool nonblock)
{
struct scatterlist sg[1];
struct virtqueue *out_vq;
ssize_t ret = 0;
unsigned int len;
debug("Entering\n");
out_vq = crdev->ovq;
/* Discard any consumed buffers. */
reclaim_consumed_buffers(crdev);
sg_init_one(sg, in_buf, in_count);
/* add sg list to virtqueue and notify host */
ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf);
if (ret < 0) {
debug("Oops! Error adding buffer to vqueue\n");
in_count = 0;
goto done;
}
if (ret == 0) {
printk(KERN_WARNING "ovq_full!!!!\n");
crdev->ovq_full = true;
}
virtqueue_kick(out_vq);
if (nonblock)
goto done;
/*
* if nonblock is false we wait until the host acknowledges it pushed
* out the data we sent.
*/
while (!virtqueue_get_buf(out_vq, &len))
cpu_relax();
debug("Leaving\n");
done:
/*
* We're expected to return the amount of data we wrote -- all
* of it
*/
return in_count;
}
static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
{
struct scatterlist sg;
unsigned int len;
sg_init_one(&sg, vb->pfns, sizeof(vb->pfns[0]) * vb->num_pfns);
/* We should always be able to add one buffer to an empty queue. */
virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL);
virtqueue_kick(vq);
/* When host has read buffer, this completes via balloon_ack */
wait_event(vb->acked, virtqueue_get_buf(vq, &len));
}
static void stats_handle_request(struct virtio_balloon *vb)
{
struct virtqueue *vq;
struct scatterlist sg;
unsigned int len, num_stats;
num_stats = update_balloon_stats(vb);
vq = vb->stats_vq;
if (!virtqueue_get_buf(vq, &len))
return;
sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats);
virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL);
virtqueue_kick(vq);
}
static int send_cmd_id_stop(struct virtio_balloon *vb)
{
struct scatterlist sg;
struct virtqueue *vq = vb->free_page_vq;
int err, unused;
/* Detach all the used buffers from the vq */
while (virtqueue_get_buf(vq, &unused))
;
sg_init_one(&sg, &vb->cmd_id_stop, sizeof(vb->cmd_id_stop));
err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_stop, GFP_KERNEL);
if (!err)
virtqueue_kick(vq);
return err;
}
/* minimal buf "allocator" that is just enough for now */
static void *get_a_buf(struct virtproc_info *vrp)
{
unsigned int len;
void *buf = NULL;
/* make sure the descriptors are updated before reading */
rmb();
/* either pick the next unused buffer */
if (vrp->last_sbuf < vrp->num_bufs / 2)
buf = vrp->sbufs + vrp->buf_size * vrp->last_sbuf++;
/* or recycle a used one */
else
buf = virtqueue_get_buf(vrp->svq, &len);
return buf;
}
/*
* Get a buffer from the ivq.
* If we already have one return it.
*/
struct crypto_vq_buffer *get_inbuf(struct crypto_device *crdev)
{
struct crypto_vq_buffer *buf;
unsigned int len;
debug("Entering\n");
if (crdev->inbuf)
return crdev->inbuf;
buf = virtqueue_get_buf(crdev->ivq, &len);
if (buf) {
buf->len = len;
buf->offset = 0;
}
debug("Leaving\n");
return buf;
}
//interrupt handler
//get available buffers from virtqueue and add them in list
static void vq_has_data(struct virtqueue *vq)
{
unsigned int len;
unsigned long flags, flags1;
struct wait_struct *tmp;
void *d;
while((d = virtqueue_get_buf(vq, &len))) {
tmp = (struct wait_struct *)kmalloc(sizeof(struct wait_struct), GFP_ATOMIC);
if (!tmp)
return;
tmp->data = d;
spin_lock_irqsave(&wait_data.lock, flags);
list_add(&(tmp->list), &(wait_data.list));
spin_unlock_irqrestore(&wait_data.lock, flags);
}
wake_up_interruptible_all(&cudrvdata.wq);
}
static int get_free_page_and_send(struct virtio_balloon *vb)
{
struct virtqueue *vq = vb->free_page_vq;
struct page *page;
struct scatterlist sg;
int err, unused;
void *p;
/* Detach all the used buffers from the vq */
while (virtqueue_get_buf(vq, &unused))
;
page = alloc_pages(VIRTIO_BALLOON_FREE_PAGE_ALLOC_FLAG,
VIRTIO_BALLOON_FREE_PAGE_ORDER);
/*
* When the allocation returns NULL, it indicates that we have got all
* the possible free pages, so return -EINTR to stop.
*/
if (!page)
return -EINTR;
p = page_address(page);
sg_init_one(&sg, p, VIRTIO_BALLOON_FREE_PAGE_SIZE);
/* There is always 1 entry reserved for the cmd id to use. */
if (vq->num_free > 1) {
err = virtqueue_add_inbuf(vq, &sg, 1, p, GFP_KERNEL);
if (unlikely(err)) {
free_pages((unsigned long)p,
VIRTIO_BALLOON_FREE_PAGE_ORDER);
return err;
}
virtqueue_kick(vq);
spin_lock_irq(&vb->free_page_list_lock);
balloon_page_push(&vb->free_page_list, page);
vb->num_free_page_blocks++;
spin_unlock_irq(&vb->free_page_list_lock);
} else {
/*
* The vq has no available entry to add this page block, so
* just free it.
*/
free_pages((unsigned long)p, VIRTIO_BALLOON_FREE_PAGE_ORDER);
}
return 0;
}
VOID
VIOSerialSendCtrlMsg(
IN WDFDEVICE Device,
IN ULONG id,
IN USHORT event,
IN USHORT value
)
{
struct VirtIOBufferDescriptor sg;
struct virtqueue *vq;
UINT len;
PPORTS_DEVICE pContext = GetPortsDevice(Device);
VIRTIO_CONSOLE_CONTROL cpkt;
if (!pContext->isHostMultiport)
{
return;
}
vq = pContext->c_ovq;
TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "--> %s vq = %p\n", __FUNCTION__, vq);
cpkt.id = id;
cpkt.event = event;
cpkt.value = value;
sg.physAddr = MmGetPhysicalAddress(&cpkt);
sg.length = sizeof(cpkt);
WdfWaitLockAcquire(pContext->COutVqLock, NULL);
if(0 <= virtqueue_add_buf(vq, &sg, 1, 0, &cpkt, NULL, 0))
{
virtqueue_kick(vq);
while(!virtqueue_get_buf(vq, &len))
{
LARGE_INTEGER interval;
interval.QuadPart = -1;
KeDelayExecutionThread(KernelMode, FALSE, &interval);
}
}
WdfWaitLockRelease(pContext->COutVqLock);
TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "<-- %s\n", __FUNCTION__);
}
static void *get_a_tx_buf(struct virtproc_info *vrp)
{
unsigned int len;
void *ret;
mutex_lock(&vrp->tx_lock);
if (vrp->last_sbuf < RPMSG_NUM_BUFS / 2)
ret = vrp->sbufs + RPMSG_BUF_SIZE * vrp->last_sbuf++;
else
ret = virtqueue_get_buf(vrp->svq, &len);
mutex_unlock(&vrp->tx_lock);
return ret;
}
static void virtinput_recv_events(struct virtqueue *vq)
{
struct virtio_input *vi = vq->vdev->priv;
struct virtio_input_event *event;
unsigned long flags;
unsigned int len;
spin_lock_irqsave(&vi->lock, flags);
if (vi->ready) {
while ((event = virtqueue_get_buf(vi->evt, &len)) != NULL) {
spin_unlock_irqrestore(&vi->lock, flags);
input_event(vi->idev,
le16_to_cpu(event->type),
le16_to_cpu(event->code),
le32_to_cpu(event->value));
spin_lock_irqsave(&vi->lock, flags);
virtinput_queue_evtbuf(vi, event);
}
virtqueue_kick(vq);
}
spin_unlock_irqrestore(&vi->lock, flags);
}
/* super simple buffer "allocator" that is just enough for now */
static void *get_a_tx_buf(struct virtproc_info *vrp)
{
unsigned int len;
void *ret;
/* support multiple concurrent senders */
mutex_lock(&vrp->tx_lock);
/*
* either pick the next unused tx buffer
* (half of our buffers are used for sending messages)
*/
if (vrp->last_sbuf < RPMSG_NUM_BUFS / 2)
ret = vrp->sbufs + RPMSG_BUF_SIZE * vrp->last_sbuf++;
/* or recycle a used one */
else
ret = virtqueue_get_buf(vrp->svq, &len);
mutex_unlock(&vrp->tx_lock);
return ret;
}
PVOID
VIOSerialGetInBuf(
IN PVIOSERIAL_PORT port
)
{
PPORT_BUFFER buf = NULL;
struct virtqueue *vq = GetInQueue(port);
UINT len;
TraceEvents(TRACE_LEVEL_VERBOSE, DBG_QUEUEING, "--> %s\n", __FUNCTION__);
if (vq)
{
buf = virtqueue_get_buf(vq, &len);
if (buf)
{
buf->len = len;
buf->offset = 0;
}
}
TraceEvents(TRACE_LEVEL_VERBOSE, DBG_QUEUEING, "<-- %s\n", __FUNCTION__);
return buf;
}
