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| author | Shannon Zhao <shannon.zhao@linaro.org> | 2016-04-07 15:03:27 +0300 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2016-07-06 12:34:44 +0300 |
| commit | d22cbe651f6573f66c649d5ba91fb87552bbb297 (patch) | |
| tree | a326b6640de2fa8f996f573e89a0b69d4d81de26 /arch | |
| parent | 383ff518a79fe3dcece579b9d30be77b219d10f8 (diff) | |
| download | linux-d22cbe651f6573f66c649d5ba91fb87552bbb297.tar.xz | |
arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/xen/enlighten.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index d94f726adc8a..06bd61ac42cb 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -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; |