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x86/CPU/AMD: Calculate last level cache ID from number of sharing threads

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Last Level Cache ID can be calculated from the number of threads sharing
the cache, which is available from CPUID Fn0x8000001D (Cache Properties).
This is used to left-shift the APIC ID to derive LLC ID.

Therefore, default to this method unless the APIC ID enumeration does not
follow the scheme.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1524864877-111962-5-git-send-email-suravee.suthikulpanit@amd.com
This commit is contained in:
Suravee Suthikulpanit
2018-04-27 16:34:37 -05:00
committed by Thomas Gleixner
parent 1d200c078d
commit 68091ee7ac
3 changed files with 49 additions and 16 deletions
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7
arch/x86/include/asm/cacheinfo.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_CACHEINFO_H
#define _ASM_X86_CACHEINFO_H
void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c, int cpu, u8 node_id);
#endif /* _ASM_X86_CACHEINFO_H */