LOCAL void mcd_event_put_request(struct domain *d, mcd_event_request_t *req)
{
mcd_event_front_ring_t *front_ring;
RING_IDX req_prod;
my_trace()
mcd_event_ring_lock(d);
front_ring = &d->mcd_event.front_ring;
req_prod = front_ring->req_prod_pvt;
/* Copy request */
memcpy(RING_GET_REQUEST(front_ring, req_prod), req, sizeof(*req));
req_prod++;
/* Update ring */
front_ring->req_prod_pvt = req_prod;
RING_PUSH_REQUESTS(front_ring);
mcd_event_ring_unlock(d);
my_trace()
// TODO check whether I have to use notifying through channel or just ring.. ???
notify_via_xen_event_channel(d, d->mcd_event.xen_port);
}
/*
* This must be preceded by a call to claim_slot(), and is guaranteed to
* succeed. As a side-effect however, the vCPU may be paused if the ring is
* overly full and its continued execution would cause stalling and excessive
* waiting. The vCPU will be automatically unpaused when the ring clears.
*/
void vm_event_put_request(struct domain *d,
struct vm_event_domain *ved,
vm_event_request_t *req)
{
vm_event_front_ring_t *front_ring;
int free_req;
unsigned int avail_req;
RING_IDX req_prod;
if ( current->domain != d )
{
req->flags |= VM_EVENT_FLAG_FOREIGN;
#ifndef NDEBUG
if ( !(req->flags & VM_EVENT_FLAG_VCPU_PAUSED) )
gdprintk(XENLOG_G_WARNING, "d%dv%d was not paused.\n",
d->domain_id, req->vcpu_id);
#endif
}
req->version = VM_EVENT_INTERFACE_VERSION;
vm_event_ring_lock(ved);
/* Due to the reservations, this step must succeed. */
front_ring = &ved->front_ring;
free_req = RING_FREE_REQUESTS(front_ring);
ASSERT(free_req > 0);
/* Copy request */
req_prod = front_ring->req_prod_pvt;
memcpy(RING_GET_REQUEST(front_ring, req_prod), req, sizeof(*req));
req_prod++;
/* Update ring */
front_ring->req_prod_pvt = req_prod;
RING_PUSH_REQUESTS(front_ring);
/* We've actually *used* our reservation, so release the slot. */
vm_event_release_slot(d, ved);
/* Give this vCPU a black eye if necessary, on the way out.
* See the comments above wake_blocked() for more information
* on how this mechanism works to avoid waiting. */
avail_req = vm_event_ring_available(ved);
if( current->domain == d && avail_req < d->max_vcpus )
vm_event_mark_and_pause(current, ved);
vm_event_ring_unlock(ved);
notify_via_xen_event_channel(d, ved->xen_port);
}
/*
* This must be preceded by a call to claim_slot(), and is guaranteed to
* succeed. As a side-effect however, the vCPU may be paused if the ring is
* overly full and its continued execution would cause stalling and excessive
* waiting. The vCPU will be automatically unpaused when the ring clears.
*/
void mem_event_put_request(struct domain *d,
struct mem_event_domain *med,
mem_event_request_t *req)
{
mem_event_front_ring_t *front_ring;
int free_req;
unsigned int avail_req;
RING_IDX req_prod;
if ( current->domain != d )
{
req->flags |= MEM_EVENT_FLAG_FOREIGN;
ASSERT( !(req->flags & MEM_EVENT_FLAG_VCPU_PAUSED) );
}
mem_event_ring_lock(med);
/* Due to the reservations, this step must succeed. */
front_ring = &med->front_ring;
free_req = RING_FREE_REQUESTS(front_ring);
ASSERT(free_req > 0);
/* Copy request */
req_prod = front_ring->req_prod_pvt;
memcpy(RING_GET_REQUEST(front_ring, req_prod), req, sizeof(*req));
req_prod++;
/* Update ring */
front_ring->req_prod_pvt = req_prod;
RING_PUSH_REQUESTS(front_ring);
/* We've actually *used* our reservation, so release the slot. */
mem_event_release_slot(d, med);
/* Give this vCPU a black eye if necessary, on the way out.
* See the comments above wake_blocked() for more information
* on how this mechanism works to avoid waiting. */
avail_req = mem_event_ring_available(med);
if( current->domain == d && avail_req < d->max_vcpus )
mem_event_mark_and_pause(current, med);
mem_event_ring_unlock(med);
notify_via_xen_event_channel(d, med->xen_port);
}
void mem_event_put_request(struct domain *d, mem_event_request_t *req)
{
mem_event_front_ring_t *front_ring;
RING_IDX req_prod;
mem_event_ring_lock(d);
front_ring = &d->mem_event.front_ring;
req_prod = front_ring->req_prod_pvt;
/* Copy request */
memcpy(RING_GET_REQUEST(front_ring, req_prod), req, sizeof(*req));
req_prod++;
/* Update ring */
front_ring->req_prod_pvt = req_prod;
RING_PUSH_REQUESTS(front_ring);
mem_event_ring_unlock(d);
notify_via_xen_event_channel(d, d->mem_event.xen_port);
}
static uint8_t vpl011_read_data(struct domain *d)
{
unsigned long flags;
uint8_t data = 0;
struct vpl011 *vpl011 = &d->arch.vpl011;
struct xencons_interface *intf = vpl011->ring_buf;
XENCONS_RING_IDX in_cons, in_prod;
VPL011_LOCK(d, flags);
in_cons = intf->in_cons;
in_prod = intf->in_prod;
smp_rmb();
/*
* It is expected that there will be data in the ring buffer when this
* function is called since the guest is expected to read the data register
* only if the TXFE flag is not set.
* If the guest still does read when TXFE bit is set then 0 will be returned.
*/
if ( xencons_queued(in_prod, in_cons, sizeof(intf->in)) > 0 )
{
unsigned int fifo_level;
data = intf->in[xencons_mask(in_cons, sizeof(intf->in))];
in_cons += 1;
smp_mb();
intf->in_cons = in_cons;
fifo_level = xencons_queued(in_prod, in_cons, sizeof(intf->in));
/* If the FIFO is now empty, we clear the receive timeout interrupt. */
if ( fifo_level == 0 )
{
vpl011->uartfr |= RXFE;
vpl011->uartris &= ~RTI;
}
/* If the FIFO is more than half empty, we clear the RX interrupt. */
if ( fifo_level < sizeof(intf->in) - SBSA_UART_FIFO_LEVEL )
vpl011->uartris &= ~RXI;
vpl011_update_interrupt_status(d);
}
else
gprintk(XENLOG_ERR, "vpl011: Unexpected IN ring buffer empty\n");
/*
* We have consumed a character or the FIFO was empty, so clear the
* "FIFO full" bit.
*/
vpl011->uartfr &= ~RXFF;
VPL011_UNLOCK(d, flags);
/*
* Send an event to console backend to indicate that data has been
* read from the IN ring buffer.
*/
notify_via_xen_event_channel(d, vpl011->evtchn);
return data;
}
static void vpl011_write_data(struct domain *d, uint8_t data)
{
unsigned long flags;
struct vpl011 *vpl011 = &d->arch.vpl011;
struct xencons_interface *intf = vpl011->ring_buf;
XENCONS_RING_IDX out_cons, out_prod;
VPL011_LOCK(d, flags);
out_cons = intf->out_cons;
out_prod = intf->out_prod;
smp_mb();
/*
* It is expected that the ring is not full when this function is called
* as the guest is expected to write to the data register only when the
* TXFF flag is not set.
* In case the guest does write even when the TXFF flag is set then the
* data will be silently dropped.
*/
if ( xencons_queued(out_prod, out_cons, sizeof(intf->out)) !=
sizeof (intf->out) )
{
unsigned int fifo_level;
intf->out[xencons_mask(out_prod, sizeof(intf->out))] = data;
out_prod += 1;
smp_wmb();
intf->out_prod = out_prod;
fifo_level = xencons_queued(out_prod, out_cons, sizeof(intf->out));
if ( fifo_level == sizeof(intf->out) )
{
vpl011->uartfr |= TXFF;
/*
* This bit is set only when FIFO becomes full. This ensures that
* the SBSA UART driver can write the early console data as fast as
* possible, without waiting for the BUSY bit to get cleared before
* writing each byte.
*/
vpl011->uartfr |= BUSY;
}
vpl011_update_tx_fifo_status(vpl011, fifo_level);
vpl011_update_interrupt_status(d);
}
else
gprintk(XENLOG_ERR, "vpl011: Unexpected OUT ring buffer full\n");
vpl011->uartfr &= ~TXFE;
VPL011_UNLOCK(d, flags);
/*
* Send an event to console backend to indicate that there is
* data in the OUT ring buffer.
*/
notify_via_xen_event_channel(d, vpl011->evtchn);
}
