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MIPS: SMP: Implement parallel CPU bring up for EyeQ

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Added support for starting CPUs in parallel on EyeQ to speed up boot time.

On EyeQ5, booting 8 CPUs is now ~90ms faster.
On EyeQ6, booting 32 CPUs is now ~650ms faster.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Gregory CLEMENT
2025-04-13 21:12:32 +02:00
committed by Thomas Bogendoerfer
parent 0f4ae7c6ec
commit 76c43eb507
4 changed files with 25 additions and 0 deletions
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2
arch/mips/kernel/smp-cps.c
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@@ -236,6 +236,7 @@ static void __init cps_smp_setup(void)
/* Use the number of VPEs in cluster 0 core 0 for smp_num_siblings */
if (!cl && !c)
smp_num_siblings = core_vpes;
cpumask_set_cpu(nvpes, &__cpu_primary_thread_mask);
for (v = 0; v < min_t(int, core_vpes, NR_CPUS - nvpes); v++) {
cpu_set_cluster(&cpu_data[nvpes + v], cl);
@@ -364,6 +365,7 @@ static void __init cps_prepare_cpus(unsigned int max_cpus)
cl = cpu_cluster(&current_cpu_data);
c = cpu_core(&current_cpu_data);
cluster_bootcfg = &mips_cps_cluster_bootcfg[cl];
cpu_smt_set_num_threads(core_vpes, core_vpes);
core_bootcfg = &cluster_bootcfg->core_config[c];
bitmap_set(cluster_bootcfg->core_power, cpu_core(&current_cpu_data), 1);
atomic_set(&core_bootcfg->vpe_mask, 1 << cpu_vpe_id(&current_cpu_data));