linux-kernel - [PATCH] xen: use PHYSDEVOP_get_free_pirq to implement find_unbound

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Date:	Fri, 19 Nov 2010 13:58:03 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	linux-kernel@...r.kernel.org
CC:	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
	xen-devel@...ts.xensource.com
Subject: [PATCH] xen: use PHYSDEVOP_get_free_pirq to implement
 find_unbound_pirq

Use PHYSDEVOP_get_free_pirq to implement find_unbound_pirq

Use the new hypercall PHYSDEVOP_get_free_pirq to ask Xen to allocate a
pirq. Remove the unsupported PHYSDEVOP_get_nr_pirqs hypercall to get the
amount of pirq available.

Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 321a0c8..ffd286e 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -382,12 +382,17 @@ 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)
+static int find_unbound_pirq(int type)
 {
-	int i;
-	for (i = nr_pirqs-1; i >= 0; i--) {
+	int rc, i;
+	struct physdev_get_free_pirq op_get_free_pirq;
+	op_get_free_pirq.type = type;
+
+	rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
+	if (!rc)
+		return op_get_free_pirq.pirq;
+
+	for (i = 16; i <= nr_pirqs-1; i++) {
 		if (pirq_to_irq[i] < 0)
 			return i;
 	}
@@ -669,7 +674,7 @@ void xen_allocate_pirq_msi(char *name, int *irq, int *pirq)
 	if (*irq == -1)
 		goto out;
 
-	*pirq = find_unbound_pirq();
+	*pirq = find_unbound_pirq(MAP_PIRQ_TYPE_MSI);
 	if (*pirq == -1)
 		goto out;
 
@@ -1504,23 +1509,12 @@ void xen_callback_vector(void) {}
 void __init xen_init_IRQ(void)
 {
 	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);
 
-	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;
-	}
+	nr_pirqs = nr_irqs;
 	pirq_to_irq = kcalloc(nr_pirqs, sizeof(*pirq_to_irq), GFP_KERNEL);
 	for (i = 0; i < nr_pirqs; i++)
 		pirq_to_irq[i] = -1;
diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h
index 2b2c66c..534cac8 100644
--- a/include/xen/interface/physdev.h
+++ b/include/xen/interface/physdev.h
@@ -188,6 +188,16 @@ struct physdev_nr_pirqs {
     uint32_t nr_pirqs;
 };
 
+/* type is MAP_PIRQ_TYPE_GSI or MAP_PIRQ_TYPE_MSI
+ * the hypercall returns a free pirq */
+#define PHYSDEVOP_get_free_pirq    23
+struct physdev_get_free_pirq {
+    /* IN */ 
+    int type;
+    /* OUT */
+    uint32_t pirq;
+};
+
 /*
  * Notify that some PIRQ-bound event channels have been unmasked.
  * ** This command is obsolete since interface version 0x00030202 and is **
--
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