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pc: Add x86_topo_ids_from_apicid()

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It's reverse of apicid_from_topo_ids() and will be used in follow up
patches to fill in data structures for query-hotpluggable-cpus and
for user friendly error reporting.

Backports commit 9f3aab58539b4cc716e42e772be8116dc2e7d159 from qemu
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Igor Mammedov 2018-02-25 20:31:35 -05:00 committed by Lioncash
parent bc8dbd862d
commit 95cced34fb
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1 changed files with 15 additions and 0 deletions
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15
qemu/target-i386/topology.h
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@ -92,6 +92,21 @@ static inline unsigned apicid_pkg_offset(unsigned nr_cores, unsigned nr_threads)
apicid_core_width(nr_cores, nr_threads);
}
/* Calculate thread/core/package IDs for a specific topology,
* based on APIC ID
*/
static inline void x86_topo_ids_from_apicid(apic_id_t apicid,
unsigned nr_cores,
unsigned nr_threads,
X86CPUTopoInfo *topo)
{
topo->smt_id = apicid &
~(0xFFFFFFFFUL << apicid_smt_width(nr_cores, nr_threads));
topo->core_id = (apicid >> apicid_core_offset(nr_cores, nr_threads)) &
~(0xFFFFFFFFUL << apicid_core_width(nr_cores, nr_threads));
topo->pkg_id = apicid >> apicid_pkg_offset(nr_cores, nr_threads);
}
/* Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID
*
* The caller must make sure core_id < nr_cores and smt_id < nr_threads.