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x86/acpi: Add functions to setup and access the wakeup mailbox

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Systems that describe hardware using DeviceTree graphs may enumerate and
implement the wakeup mailbox as defined in the ACPI specification but do
not otherwise depend on ACPI. Expose functions to setup and access the
location of the wakeup mailbox from outside ACPI code.

The function acpi_setup_mp_wakeup_mailbox() stores the physical address of
the mailbox and updates the wakeup_secondary_cpu_64() APIC callback.

The function acpi_madt_multiproc_wakeup_mailbox() returns a pointer to the
mailbox.

Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Dexuan Cui <dexuan@kernel.org>
This commit is contained in:
Ricardo Neri 2026-03-04 15:41:13 -08:00 committed by Dexuan Cui
parent bdf5eb306c
commit a746607df2
2 changed files with 21 additions and 0 deletions
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10
arch/x86/include/asm/acpi.h
View File

@ -182,6 +182,9 @@ void __iomem *x86_acpi_os_ioremap(acpi_physical_address phys, acpi_size size);
#define acpi_os_ioremap acpi_os_ioremap
#endif
void acpi_setup_mp_wakeup_mailbox(u64 addr);
struct acpi_madt_multiproc_wakeup_mailbox *acpi_get_mp_wakeup_mailbox(void);
#else /* !CONFIG_ACPI */
#define acpi_lapic 0
@ -200,6 +203,13 @@ static inline u64 x86_default_get_root_pointer(void)
return 0;
}
static inline void acpi_setup_mp_wakeup_mailbox(u64 addr) { }
static inline struct acpi_madt_multiproc_wakeup_mailbox *acpi_get_mp_wakeup_mailbox(void)
{
return NULL;
}
#endif /* !CONFIG_ACPI */
#define ARCH_HAS_POWER_INIT 1

11
arch/x86/kernel/acpi/madt_wakeup.c
View File

@ -247,3 +247,14 @@ int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
return 0;
}
void __init acpi_setup_mp_wakeup_mailbox(u64 mailbox_paddr)
{
acpi_mp_wake_mailbox_paddr = mailbox_paddr;
apic_update_callback(wakeup_secondary_cpu_64, acpi_wakeup_cpu);
}
struct acpi_madt_multiproc_wakeup_mailbox *acpi_get_mp_wakeup_mailbox(void)
{
return acpi_mp_wake_mailbox;
}