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 /include | |
| 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 'include')
| -rw-r--r-- | include/acpi/actbl2.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h index fa63362469aa..e27958ef8264 100644 --- a/include/acpi/actbl2.h +++ b/include/acpi/actbl2.h @@ -1197,8 +1197,20 @@ struct acpi_madt_multiproc_wakeup { u16 version; u32 reserved; /* reserved - must be zero */ u64 mailbox_address; + u64 reset_vector; }; +/* Values for Version field above */ + +enum acpi_madt_multiproc_wakeup_version { + ACPI_MADT_MP_WAKEUP_VERSION_NONE = 0, + ACPI_MADT_MP_WAKEUP_VERSION_V1 = 1, + ACPI_MADT_MP_WAKEUP_VERSION_RESERVED = 2, /* 2 and greater are reserved */ +}; + +#define ACPI_MADT_MP_WAKEUP_SIZE_V0 16 +#define ACPI_MADT_MP_WAKEUP_SIZE_V1 24 + #define ACPI_MULTIPROC_WAKEUP_MB_OS_SIZE 2032 #define ACPI_MULTIPROC_WAKEUP_MB_FIRMWARE_SIZE 2048 @@ -1211,7 +1223,8 @@ struct acpi_madt_multiproc_wakeup_mailbox { u8 reserved_firmware[ACPI_MULTIPROC_WAKEUP_MB_FIRMWARE_SIZE]; /* reserved for firmware use */ }; -#define ACPI_MP_WAKE_COMMAND_WAKEUP 1 +#define ACPI_MP_WAKE_COMMAND_WAKEUP 1 +#define ACPI_MP_WAKE_COMMAND_TEST 2 /* 17: CPU Core Interrupt Controller (ACPI 6.5) */ |