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| author | Thomas Gleixner <tglx@linutronix.de> | 2024-02-13 22:04:03 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-15 22:07:37 +0100 |
| commit | bda74aae20086c044b31ca0dcdab7deaaf23d0e8 (patch) | |
| tree | b52e4369d23cc3e8da3f945ddcbaacca515f5e16 /arch/x86/kernel/cpu/topology.h | |
| parent | x86/cpu: Provide cpu_init/parse_topology() (diff) | |
| download | linux-bda74aae20086c044b31ca0dcdab7deaaf23d0e8.tar.xz linux-bda74aae20086c044b31ca0dcdab7deaaf23d0e8.zip | |
x86/cpu: Add legacy topology parser
The legacy topology detection via CPUID leaf 4, which provides the number
of cores in the package and CPUID leaf 1 which provides the number of
logical CPUs in case that FEATURE_HT is enabled and the CMP_LEGACY feature
is not set, is shared for Intel, Centaur and Zhaoxin CPUs.
Lift the code from common.c without the early detection hack and provide it
as common fallback mechanism.
Will be utilized in later changes.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Wang Wendy <wendy.wang@intel.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://lore.kernel.org/r/20240212153624.644448852@linutronix.de
Diffstat (limited to 'arch/x86/kernel/cpu/topology.h')
| -rw-r--r-- | arch/x86/kernel/cpu/topology.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/topology.h b/arch/x86/kernel/cpu/topology.h index 99c94c519b5d..934a100b9fe6 100644 --- a/arch/x86/kernel/cpu/topology.h +++ b/arch/x86/kernel/cpu/topology.h @@ -6,6 +6,9 @@ struct topo_scan { struct cpuinfo_x86 *c; unsigned int dom_shifts[TOPO_MAX_DOMAIN]; unsigned int dom_ncpus[TOPO_MAX_DOMAIN]; + + /* Legacy CPUID[1]:EBX[23:16] number of logical processors */ + unsigned int ebx1_nproc_shift; }; bool topo_is_converted(struct cpuinfo_x86 *c); |