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authorDavid Vrabel <david.vrabel@citrix.com>2013-03-15 10:55:41 +0000
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-01-06 10:07:52 -0500
commitbf2bbe07f13846a90d4447521d87566d6f87bc0e (patch)
tree930d312f8d74a5892fb37429969de6016cc3eb6a /drivers/xen
parent0dc0064add422bc0ef5165ebe9ece3052bbd457d (diff)
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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/events/events_2l.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
index ecb402a149e..d7ff9175730 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",