[Xen-devel] [PATCH v4 15/21] arm/gic: Add ACPI support for GIC preinit

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Since ACPI 6.0 defines that GIC Distributor Structure contains the GIC
version filed, it could get GIC version from that. Then call acpi device
initializing function to preinit GIC device.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
V4: use ACPI_MADT_GIC_VERSION_V* instead of GICv*
---
 xen/arch/arm/gic.c | 37 +++++++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 43e6fa2..840075f 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -27,6 +27,7 @@
 #include <xen/softirq.h>
 #include <xen/list.h>
 #include <xen/device_tree.h>
+#include <xen/acpi.h>
 #include <asm/p2m.h>
 #include <asm/domain.h>
 #include <asm/platform.h>
@@ -34,6 +35,7 @@
 #include <asm/io.h>
 #include <asm/gic.h>
 #include <asm/vgic.h>
+#include <asm/acpi.h>
 
 static void gic_restore_pending_irqs(struct vcpu *v);
 
@@ -228,10 +230,7 @@ int gic_irq_xlate(const u32 *intspec, unsigned int intsize,
     return 0;
 }
 
-/* Find the interrupt controller and set up the callback to translate
- * device tree IRQ.
- */
-void __init gic_preinit(void)
+static void __init gic_dt_preinit(void)
 {
     int rc;
     struct dt_device_node *node;
@@ -261,6 +260,36 @@ void __init gic_preinit(void)
     dt_device_set_used_by(node, DOMID_XEN);
 }
 
+#ifdef CONFIG_ACPI
+static void __init gic_acpi_preinit(void)
+{
+    struct acpi_subtable_header *header;
+    struct acpi_madt_generic_distributor *dist;
+
+    header = acpi_table_get_entry_madt(ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 0);
+    if ( !header )
+        panic("No valid GICD entries exists");
+
+    dist = container_of(header, struct acpi_madt_generic_distributor, header);
+
+    if ( acpi_device_init(DEVICE_GIC, NULL, dist->version) )
+        panic("Unable to find compatible GIC in the ACPI table");
+}
+#else
+static void __init gic_acpi_preinit(void) {}
+#endif
+
+/* Find the interrupt controller and set up the callback to translate
+ * device tree or ACPI IRQ.
+ */
+void __init gic_preinit(void)
+{
+    if ( acpi_disabled )
+        gic_dt_preinit();
+    else
+        gic_acpi_preinit();
+}
+
 /* Set up the GIC */
 void __init gic_init(void)
 {
-- 
2.0.4



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