[PATCH v2 09/16] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI
From: Shannon Zhao <hidden>
Date: 2016-01-15 07:00:15
Also in:
linux-devicetree, linux-efi, lkml, xen-devel
Subsystem:
arm port, the rest, xen hypervisor arm · Maintainers:
Russell King, Linus Torvalds, Stefano Stabellini
From: Shannon Zhao <redacted> When booting with ACPI, it could get the event-channel irq through HVM_PARAM_CALLBACK_IRQ. Signed-off-by: Shannon Zhao <redacted> --- 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