[Xen-devel] [PATCH v2 09/16] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

When booting with ACPI, it could get the event-channel irq through
HVM_PARAM_CALLBACK_IRQ.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 arch/arm/xen/enlighten.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 6d90a62..4e78c49 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -29,6 +29,7 @@
 #include <linux/time64.h>
 #include <linux/timekeeping.h>
 #include <linux/timekeeper_internal.h>
+#include <linux/acpi.h>
 
 #include <linux/mm.h>
 
@@ -270,7 +271,34 @@ static int __init xen_guest_init(void)
        if (!xen_domain())
                return 0;
 
-       xen_events_irq = irq_of_parse_and_map(xen_node, 0);
+       if (!acpi_disabled) {
+#ifdef CONFIG_ACPI
+               struct xen_hvm_param a;
+               int interrupt, trigger, polarity;
+
+               a.domid = DOMID_SELF;
+               a.index = HVM_PARAM_CALLBACK_IRQ;
+               xen_events_irq = 0;
+               if (!HYPERVISOR_hvm_op(HVMOP_get_param, &a)) {
+                       if ((a.value >> 56) == 3) {
+                               interrupt = a.value & 0xff;
+                               trigger = ((a.value >> 8) & 0x1)
+                                         ? ACPI_EDGE_SENSITIVE
+                                         : ACPI_LEVEL_SENSITIVE;
+                               polarity = ((a.value >> 8) & 0x2)
+                                         ? ACPI_ACTIVE_LOW
+                                         : ACPI_ACTIVE_HIGH;
+                               xen_events_irq = acpi_register_gsi(NULL,
+                                                                  interrupt,
+                                                                  trigger,
+                                                                  polarity);
+                       }
+               }
+#endif
+       } else {
+               xen_events_irq = irq_of_parse_and_map(xen_node, 0);
+       }
+
        if (!xen_events_irq) {
                pr_err("Xen event channel interrupt not found\n");
                return -ENODEV;
-- 
2.0.4



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