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ACPI: GTDT: Parse information related to the EL2 virtual timer

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Now that we have a way to identify GTDTv3, allow the information
related to the EL2 virtual timer to be retrieved by the interface
used by the architected timer driver.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://patch.msgid.link/20260523140242.586031-3-maz@kernel.org
This commit is contained in:
Marc Zyngier 2026-05-23 15:02:27 +01:00 committed by Daniel Lezcano
parent 002dcb3a89
commit fe15af3e75
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GPG Key ID: A832238A2A4FE84F
1 changed files with 20 additions and 0 deletions
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20
drivers/acpi/arm64/gtdt.c
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@ -41,6 +41,14 @@ struct gtdt_v3 {
static struct acpi_gtdt_descriptor acpi_gtdt_desc __initdata;
static __init struct acpi_gtdt_el2 *gtdt_to_el2_vtimer(struct acpi_table_gtdt *gtdt)
{
if (gtdt->header.revision < 3)
return NULL;
return &container_of(gtdt, struct gtdt_v3, gtdt_v2)->el2_vtimer;
}
static __init bool platform_timer_valid(void *platform_timer)
{
struct acpi_gtdt_header *gh = platform_timer;
@ -112,6 +120,7 @@ static int __init map_gt_gsi(u32 interrupt, u32 flags)
int __init acpi_gtdt_map_ppi(int type)
{
struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt;
struct acpi_gtdt_el2 *el2_vtimer = gtdt_to_el2_vtimer(gtdt);
switch (type) {
case ARCH_TIMER_PHYS_NONSECURE_PPI:
@ -124,6 +133,12 @@ int __init acpi_gtdt_map_ppi(int type)
case ARCH_TIMER_HYP_PPI:
return map_gt_gsi(gtdt->non_secure_el2_interrupt,
gtdt->non_secure_el2_flags);
case ARCH_TIMER_HYP_VIRT_PPI:
if (el2_vtimer && el2_vtimer->virtual_el2_timer_gsiv)
return map_gt_gsi(el2_vtimer->virtual_el2_timer_gsiv,
el2_vtimer->virtual_el2_timer_flags);
return 0;
default:
pr_err("Failed to map timer interrupt: invalid type.\n");
}
@ -141,6 +156,7 @@ int __init acpi_gtdt_map_ppi(int type)
bool __init acpi_gtdt_c3stop(int type)
{
struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt;
struct acpi_gtdt_el2 *el2_vtimer = gtdt_to_el2_vtimer(gtdt);
switch (type) {
case ARCH_TIMER_PHYS_NONSECURE_PPI:
@ -152,6 +168,10 @@ bool __init acpi_gtdt_c3stop(int type)
case ARCH_TIMER_HYP_PPI:
return !(gtdt->non_secure_el2_flags & ACPI_GTDT_ALWAYS_ON);
case ARCH_TIMER_HYP_VIRT_PPI:
return el2_vtimer && el2_vtimer->virtual_el2_timer_gsiv &&
!(el2_vtimer->virtual_el2_timer_flags & ACPI_GTDT_ALWAYS_ON);
default:
pr_err("Failed to get c3stop info: invalid type.\n");
}