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path: root/drivers/xen/events.c
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Diffstat (limited to 'drivers/xen/events.c')
-rw-r--r--drivers/xen/events.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 018a96275ee4..07e56e5a5d2d 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -102,6 +102,7 @@ struct irq_info
static struct irq_info *irq_info;
static int *pirq_to_irq;
+static int nr_pirqs;
static int *evtchn_to_irq;
struct cpu_evtchn_s {
@@ -378,10 +379,12 @@ static int get_nr_hw_irqs(void)
return ret;
}
+/* callers of this function should make sure that PHYSDEVOP_get_nr_pirqs
+ * succeeded otherwise nr_pirqs won't hold the right value */
static int find_unbound_pirq(void)
{
int i;
- for (i = 0; i < nr_irqs; i++) {
+ for (i = nr_pirqs-1; i >= 0; i--) {
if (pirq_to_irq[i] < 0)
return i;
}
@@ -602,6 +605,13 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
spin_lock(&irq_mapping_update_lock);
+ if ((pirq > nr_pirqs) || (gsi > nr_irqs)) {
+ printk(KERN_WARNING "xen_map_pirq_gsi: %s %s is incorrect!\n",
+ pirq > nr_pirqs ? "nr_pirqs" :"",
+ gsi > nr_irqs ? "nr_irqs" : "");
+ goto out;
+ }
+
irq = find_irq_by_gsi(gsi);
if (irq != -1) {
printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n",
@@ -1349,14 +1359,26 @@ void xen_callback_vector(void) {}
void __init xen_init_IRQ(void)
{
- int i;
+ int i, rc;
+ struct physdev_nr_pirqs op_nr_pirqs;
cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s),
GFP_KERNEL);
irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL);
- pirq_to_irq = kcalloc(nr_irqs, sizeof(*pirq_to_irq), GFP_KERNEL);
- for (i = 0; i < nr_irqs; i++)
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_nr_pirqs, &op_nr_pirqs);
+ if (rc < 0) {
+ nr_pirqs = nr_irqs;
+ if (rc != -ENOSYS)
+ printk(KERN_WARNING "PHYSDEVOP_get_nr_pirqs returned rc=%d\n", rc);
+ } else {
+ if (xen_pv_domain() && !xen_initial_domain())
+ nr_pirqs = max((int)op_nr_pirqs.nr_pirqs, nr_irqs);
+ else
+ nr_pirqs = op_nr_pirqs.nr_pirqs;
+ }
+ pirq_to_irq = kcalloc(nr_pirqs, sizeof(*pirq_to_irq), GFP_KERNEL);
+ for (i = 0; i < nr_pirqs; i++)
pirq_to_irq[i] = -1;
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),