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x86/topology: Add CPUID.1F multi-die/package support

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Some new systems have multiple software-visible die within each package.

Update Linux parsing of the Intel CPUID "Extended Topology Leaf" to handle
either CPUID.B, or the new CPUID.1F.

Add cpuinfo_x86.die_id and cpuinfo_x86.max_dies to store the result.

die_id will be non-zero only for multi-die/package systems.

Signed-off-by: Len Brown <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Ingo Molnar <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/7b23d2d26d717b8e14ba137c94b70943f1ae4b5c.1557769318.git.len.brown@intel.com
This commit is contained in:
Len Brown 2019-05-13 13:58:45 -04:00 • committed by Thomas Gleixner
commit 7745f03eb3
4 changed files with 75 additions and 20 deletions
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Documentation/x86/topology.rst
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@ -49,6 +49,10 @@ Package-related topology information in the kernel:
The number of cores in a package. This information is retrieved via CPUID.
- cpuinfo_x86.x86_max_dies:
The number of dies in a package. This information is retrieved via CPUID.
- cpuinfo_x86.phys_proc_id:
The physical ID of the package. This information is retrieved via CPUID