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[ Upstream commit 028c221ed1 ]
AMD systems provide a "NodeId" value that represents a global ID
indicating to which "Node" a logical CPU belongs. The "Node" is a
physical structure equivalent to a Die, and it should not be confused
with logical structures like NUMA nodes. Logical nodes can be adjusted
based on firmware or other settings whereas the physical nodes/dies are
fixed based on hardware topology.
The NodeId value can be used when a physical ID is needed by software.
Save the AMD NodeId to struct cpuinfo_x86.cpu_die_id. Use the value
from CPUID or MSR as appropriate. Default to phys_proc_id otherwise.
Do so for both AMD and Hygon systems.
Drop the node_id parameter from cacheinfo_*_init_llc_id() as it is no
longer needed.
Update the x86 topology documentation.
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201109210659.754018-2-Yazen.Ghannam@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
9 lines
263 B
C
9 lines
263 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_CACHEINFO_H
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#define _ASM_X86_CACHEINFO_H
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void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c, int cpu);
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void cacheinfo_hygon_init_llc_id(struct cpuinfo_x86 *c, int cpu);
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#endif /* _ASM_X86_CACHEINFO_H */
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