[Xen-devel] [PATCH v9 1/8] xen/arm: introduce handle_device_interrupts

[Stefano Stabellini <sstabellini@kernel.org>]

Move the interrupt handling code out of handle_device to a new function
so that it can be reused for dom0less VMs (it will be used in later
patches).

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
Acked-by: Julien Grall <julien.grall@arm.com>
---
Changes in v4:
- rename handle_interrupts to handle_device_interrupts
- improve in-code comment
- remove return 1 if mapping is done
- use unsigned

Changes in v3:
- add patch

The diff is hard to read but I just moved the interrupts related code
from handle_devices to a new function handle_device_interrupts, and very
little else.
---
 xen/arch/arm/domain_build.c | 100 ++++++++++++++++++++++--------------
 1 file changed, 61 insertions(+), 39 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 337a89e518..fb356603e2 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1238,6 +1238,62 @@ static int __init map_device_children(struct domain *d,
     return 0;
 }
 
+/*
+ * handle_device_interrupts retrieves the interrupts configuration from
+ * a device tree node and maps those interrupts to the target domain.
+ *
+ * Returns:
+ *   < 0 error
+ *   0   success
+ */
+static int __init handle_device_interrupts(struct domain *d,
+                                           struct dt_device_node *dev,
+                                           bool need_mapping)
+{
+    unsigned int i, nirq;
+    int res;
+    struct dt_raw_irq rirq;
+
+    nirq = dt_number_of_irq(dev);
+
+    /* Give permission and map IRQs */
+    for ( i = 0; i < nirq; i++ )
+    {
+        res = dt_device_get_raw_irq(dev, i, &rirq);
+        if ( res )
+        {
+            printk(XENLOG_ERR "Unable to retrieve irq %u for %s\n",
+                   i, dt_node_full_name(dev));
+            return res;
+        }
+
+        /*
+         * Don't map IRQ that have no physical meaning
+         * ie: IRQ whose controller is not the GIC
+         */
+        if ( rirq.controller != dt_interrupt_controller )
+        {
+            dt_dprintk("irq %u not connected to primary controller. Connected to %s\n",
+                      i, dt_node_full_name(rirq.controller));
+            continue;
+        }
+
+        res = platform_get_irq(dev, i);
+        if ( res < 0 )
+        {
+            printk(XENLOG_ERR "Unable to get irq %u for %s\n",
+                   i, dt_node_full_name(dev));
+            return res;
+        }
+
+        res = map_irq_to_domain(d, res, need_mapping, dt_node_name(dev));
+        if ( res )
+            return res;
+    }
+
+    return 0;
+}
+
 /*
  * For a given device node:
  *  - Give permission to the guest to manage IRQ and MMIO range
@@ -1250,19 +1306,16 @@ static int __init map_device_children(struct domain *d,
 static int __init handle_device(struct domain *d, struct dt_device_node *dev,
                                 p2m_type_t p2mt)
 {
-    unsigned int nirq;
     unsigned int naddr;
     unsigned int i;
     int res;
-    struct dt_raw_irq rirq;
     u64 addr, size;
     bool need_mapping = !dt_device_for_passthrough(dev);
 
-    nirq = dt_number_of_irq(dev);
     naddr = dt_number_of_address(dev);
 
-    dt_dprintk("%s passthrough = %d nirq = %d naddr = %u\n",
-               dt_node_full_name(dev), need_mapping, nirq, naddr);
+    dt_dprintk("%s passthrough = %d naddr = %u\n",
+               dt_node_full_name(dev), need_mapping, naddr);
 
     if ( need_mapping )
     {
@@ -1290,40 +1343,9 @@ static int __init handle_device(struct domain *d, struct dt_device_node *dev,
         }
     }
 
-    /* Give permission and map IRQs */
-    for ( i = 0; i < nirq; i++ )
-    {
-        res = dt_device_get_raw_irq(dev, i, &rirq);
-        if ( res )
-        {
-            printk(XENLOG_ERR "Unable to retrieve irq %u for %s\n",
-                   i, dt_node_full_name(dev));
-            return res;
-        }
-
-        /*
-         * Don't map IRQ that have no physical meaning
-         * ie: IRQ whose controller is not the GIC
-         */
-        if ( rirq.controller != dt_interrupt_controller )
-        {
-            dt_dprintk("irq %u not connected to primary controller. Connected to %s\n",
-                      i, dt_node_full_name(rirq.controller));
-            continue;
-        }
-
-        res = platform_get_irq(dev, i);
-        if ( res < 0 )
-        {
-            printk(XENLOG_ERR "Unable to get irq %u for %s\n",
-                   i, dt_node_full_name(dev));
-            return res;
-        }
-
-        res = map_irq_to_domain(d, res, need_mapping, dt_node_name(dev));
-        if ( res )
-            return res;
-    }
+    res = handle_device_interrupts(d, dev, need_mapping);
+    if ( res < 0 )
+        return res;
 
     /* Give permission and map MMIOs */
     for ( i = 0; i < naddr; i++ )
-- 
2.17.1


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