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powerpc/smp: Factor out assign_threads()

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Factor out the for loop that assigns CPU numbers to threads of a core.
The function takes the next CPU number to use as input, and returns the
next available CPU number after the threads has been assigned.

This will allow a subsequent change to assign threads out of order.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231229120107.2281153-4-mpe@ellerman.id.au
This commit is contained in:
Michael Ellerman 2024-02-15 00:14:05 +11:00
parent dca79603fb
commit 9832de6544
1 changed files with 21 additions and 11 deletions
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32
arch/powerpc/kernel/setup-common.c
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@ -411,6 +411,25 @@ static void __init cpu_init_thread_core_maps(int tpc)
u32 *cpu_to_phys_id = NULL;
static int assign_threads(unsigned int cpu, unsigned int nthreads, bool present,
const __be32 *hw_ids)
{
for (int i = 0; i < nthreads && cpu < nr_cpu_ids; i++) {
__be32 hwid;
hwid = be32_to_cpu(hw_ids[i]);
DBG(" thread %d -> cpu %d (hard id %d)\n", i, cpu, hwid);
set_cpu_present(cpu, present);
set_cpu_possible(cpu, true);
cpu_to_phys_id[cpu] = hwid;
cpu++;
}
return cpu;
}
/**
* setup_cpu_maps - initialize the following cpu maps:
* cpu_possible_mask
@ -446,7 +465,7 @@ void __init smp_setup_cpu_maps(void)
for_each_node_by_type(dn, "cpu") {
const __be32 *intserv;
__be32 cpu_be;
int j, len;
int len;
DBG(" * %pOF...\n", dn);
@ -473,16 +492,7 @@ void __init smp_setup_cpu_maps(void)
avail = !of_property_match_string(dn,
"enable-method", "spin-table");
for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
DBG(" thread %d -> cpu %d (hard id %d)\n",
j, cpu, be32_to_cpu(intserv[j]));
set_cpu_present(cpu, avail);
set_cpu_possible(cpu, true);
cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
cpu++;
}
cpu = assign_threads(cpu, nthreads, avail, intserv);
if (cpu >= nr_cpu_ids) {
of_node_put(dn);