diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2024-06-14 12:59:03 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-17 17:46:25 +0200 |
| commit | 1ceebe2e46720de02af4cf626dc847ecc4a263fd (patch) | |
| tree | 2c6ae79b7a52723c4a680951b3ec9e246c157a6e /arch/x86/include/asm/acpi.h | |
| parent | d88e7b3e35cff2c318042990d70828f64c3ae296 (diff) | |
| download | linux-1ceebe2e46720de02af4cf626dc847ecc4a263fd.tar.gz linux-1ceebe2e46720de02af4cf626dc847ecc4a263fd.tar.bz2 linux-1ceebe2e46720de02af4cf626dc847ecc4a263fd.zip | |
x86/acpi: Add support for CPU offlining for ACPI MADT wakeup method
MADT Multiprocessor Wakeup structure version 1 brings support for CPU offlining:
BIOS provides a reset vector where the CPU has to jump to for offlining itself.
The new TEST mailbox command can be used to test whether the CPU offlined itself
which means the BIOS has control over the CPU and can online it again via the
ACPI MADT wakeup method.
Add CPU offlining support for the ACPI MADT wakeup method by implementing custom
cpu_die(), play_dead() and stop_this_cpu() SMP operations.
CPU offlining makes it possible to hand over secondary CPUs over kexec, not
limiting the second kernel to a single CPU.
The change conforms to the approved ACPI spec change proposal. See the Link.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Kai Huang <kai.huang@intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Tao Liu <ltao@redhat.com>
Link: https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher
Link: https://lore.kernel.org/r/20240614095904.1345461-19-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/include/asm/acpi.h')
| -rw-r--r-- | arch/x86/include/asm/acpi.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index ceacac2b335d..21bc53f5ed0c 100644 --- a/arch/x86/include/asm/acpi.h +++ b/arch/x86/include/asm/acpi.h @@ -83,6 +83,8 @@ union acpi_subtable_headers; int __init acpi_parse_mp_wake(union acpi_subtable_headers *header, const unsigned long end); +void asm_acpi_mp_play_dead(u64 reset_vector, u64 pgd_pa); + /* * Check if the CPU can handle C2 and deeper */ |