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MIPS: CPS: Improve mips_cps_first_online_in_cluster()

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The initial implementation of this function goes through all the CPUs
in a cluster to determine if the current CPU is the only one
running. This process occurs every time the function is called.

However, during boot, we already perform this task, so let's take
advantage of this opportunity to create and fill a CPU bitmask that
can be easily and efficiently used later.

This patch modifies the function to allow providing the first
available online CPU when one already exists, which is necessary for
delay CPU calibration optimization.

Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
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
2025-07-11 11:54:20 +02:00
committed by Thomas Bogendoerfer
parent 07f8888ee7
commit c71085f2c0
4 changed files with 23 additions and 32 deletions
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5
arch/mips/kernel/smp-cps.c
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@@ -283,7 +283,7 @@ static void __init cps_smp_setup(void)
static void __init cps_prepare_cpus(unsigned int max_cpus)
{
unsigned int nclusters, ncores, core_vpes, c, cl, cca;
unsigned int nclusters, ncores, core_vpes, nvpe = 0, c, cl, cca;
bool cca_unsuitable, cores_limited;
struct cluster_boot_config *cluster_bootcfg;
struct core_boot_config *core_bootcfg;
@@ -356,10 +356,13 @@ static void __init cps_prepare_cpus(unsigned int max_cpus)
/* Allocate VPE boot configuration structs */
for (c = 0; c < ncores; c++) {
int v;
core_vpes = core_vpe_count(cl, c);
core_bootcfg[c].vpe_config = kcalloc(core_vpes,
sizeof(*core_bootcfg[c].vpe_config),
GFP_KERNEL);
for (v = 0; v < core_vpes; v++)
cpumask_set_cpu(nvpe++, &mips_cps_cluster_bootcfg[cl].cpumask);
if (!core_bootcfg[c].vpe_config)
goto err_out;
}