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x86/itmt: Add debugfs file to show core priorities 

Multiple drivers can report priorities to ITMT. To aid in debugging
any issues with the values reported by drivers introduce a debugfs
file to read out the values.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/20250609200518.3616080-14-superm1@kernel.org
This commit is contained in:
Mario Limonciello 2025-06-09 15:05:18 -05:00 committed by Borislav Petkov (AMD)
parent 13bc67a96e
commit f126821482
1 changed files with 23 additions and 0 deletions
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23
arch/x86/kernel/itmt.c
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@ -59,6 +59,18 @@ static ssize_t sched_itmt_enabled_write(struct file *filp,
return result;
}
static int sched_core_priority_show(struct seq_file *s, void *unused)
{
int cpu;
seq_puts(s, "CPU #\tPriority\n");
for_each_possible_cpu(cpu)
seq_printf(s, "%d\t%d\n", cpu, arch_asym_cpu_priority(cpu));
return 0;
}
DEFINE_SHOW_ATTRIBUTE(sched_core_priority);
static const struct file_operations dfs_sched_itmt_fops = {
.read = debugfs_read_file_bool,
.write = sched_itmt_enabled_write,
@ -67,6 +79,7 @@ static const struct file_operations dfs_sched_itmt_fops = {
};
static struct dentry *dfs_sched_itmt;
static struct dentry *dfs_sched_core_prio;
/**
* sched_set_itmt_support() - Indicate platform supports ITMT
@ -102,6 +115,14 @@ int sched_set_itmt_support(void)
return -ENOMEM;
}
dfs_sched_core_prio = debugfs_create_file("sched_core_priority", 0644,
arch_debugfs_dir, NULL,
&sched_core_priority_fops);
if (IS_ERR_OR_NULL(dfs_sched_core_prio)) {
dfs_sched_core_prio = NULL;
return -ENOMEM;
}
sched_itmt_capable = true;
sysctl_sched_itmt_enabled = 1;
@ -133,6 +154,8 @@ void sched_clear_itmt_support(void)
debugfs_remove(dfs_sched_itmt);
dfs_sched_itmt = NULL;
debugfs_remove(dfs_sched_core_prio);
dfs_sched_core_prio = NULL;
if (sysctl_sched_itmt_enabled) {
/* disable sched_itmt if we are no longer ITMT capable */