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arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI

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The kernel will get the event-channel IRQ through
HVM_PARAM_CALLBACK_IRQ.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Julien Grall <julien.grall@arm.com>
Tested-by: Julien Grall <julien.grall@arm.com>
This commit is contained in:
Shannon Zhao
2016-04-07 20:03:27 +08:00
committed by David Vrabel
parent 383ff518a7
commit d22cbe651f
1 changed files with 35 additions and 1 deletions
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36
arch/arm/xen/enlighten.c
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@ -30,6 +30,7 @@
#include <linux/time64.h>
#include <linux/timekeeping.h>
#include <linux/timekeeper_internal.h>
#include <linux/acpi.h>
#include <linux/mm.h>
@ -278,6 +279,35 @@ void __init xen_early_init(void)
add_preferred_console("hvc", 0, NULL);
}
static void __init xen_acpi_guest_init(void)
{
#ifdef CONFIG_ACPI
struct xen_hvm_param a;
int interrupt, trigger, polarity;
a.domid = DOMID_SELF;
a.index = HVM_PARAM_CALLBACK_IRQ;
if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
|| (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
xen_events_irq = 0;
return;
}
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
}
static void __init xen_dt_guest_init(void)
{
xen_events_irq = irq_of_parse_and_map(xen_node, 0);
}
static int __init xen_guest_init(void)
{
struct xen_add_to_physmap xatp;
@ -286,7 +316,11 @@ 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)
xen_acpi_guest_init();
else
xen_dt_guest_init();
if (!xen_events_irq) {
pr_err("Xen event channel interrupt not found\n");
return -ENODEV;