xen/events: Add the hypervisor interface for the FIFO-based event channels

Add the hypercall sub-ops and the structures for the shared data used
in the FIFO-based event channel ABI.

The design document for this new ABI is available here:

    http://xenbits.xen.org/people/dvrabel/event-channels-H.pdf

In summary, events are reported using a per-domain shared event array
of event words.  Each event word has PENDING, LINKED and MASKED bits
and a LINK field for pointing to the next event in the event queue.

There are 16 event queues (with different priorities) per-VCPU.

Key advantages of this new ABI include:

- Support for over 100,000 events (2^17).
- 16 different event priorities.
- Improved fairness in event latency through the use of FIFOs.

The ABI is available in Xen 4.4 and later.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
index ecb402a149e3..d7ff91757307 100644
--- a/drivers/xen/events/events_2l.c
+++ b/drivers/xen/events/events_2l.c
@@ -38,12 +38,12 @@
 /* Find the first set bit in a evtchn mask */
 #define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
 
-static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
+static DEFINE_PER_CPU(xen_ulong_t [EVTCHN_2L_NR_CHANNELS/BITS_PER_EVTCHN_WORD],
                       cpu_evtchn_mask);
 
 static unsigned evtchn_2l_max_channels(void)
 {
-        return NR_EVENT_CHANNELS;
+        return EVTCHN_2L_NR_CHANNELS;
 }
 
 static void evtchn_2l_bind_to_cpu(struct irq_info *info, unsigned cpu)
@@ -316,7 +316,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
                        i % 8 == 0 ? "\n   " : " ");
 
         printk("\nlocal cpu%d mask:\n   ", cpu);
-        for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
+        for (i = (EVTCHN_2L_NR_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
                 printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
                        cpu_evtchn[i],
                        i % 8 == 0 ? "\n   " : " ");
@@ -332,7 +332,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
         }
 
         printk("\npending list:\n");
-        for (i = 0; i < NR_EVENT_CHANNELS; i++) {
+        for (i = 0; i < EVTCHN_2L_NR_CHANNELS; i++) {
                 if (sync_test_bit(i, BM(sh->evtchn_pending))) {
                         int word_idx = i / BITS_PER_EVTCHN_WORD;
                         printk("  %d: event %d -> irq %d%s%s%s\n",