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platform/x86/intel: power-domains: Add interface to get Linux die ID

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The die ID in the Linux topology sysfs is a logical identifier that
differs from the one presented in CPUID leaf 0x1F or via MSR 0x54.

Introduce an interface that returns the Linux CPU die ID based on a
given package ID and power domain ID. This mapping is stored during the
CPU online callback in an array.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250508230250.1186619-4-srinivas.pandruvada@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada 2025-05-08 16:02:40 -07:00 • committed by Ilpo Järvinen
parent bfbe7729d6
commit e37be5d85c
No known key found for this signature in database
GPG key ID: 59AC4F6153E5CE31
2 changed files with 31 additions and 4 deletions
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34
drivers/platform/x86/intel/tpmi_power_domains.c
View file

@ -74,6 +74,8 @@ static enum cpuhp_state tpmi_hp_state __read_mostly;
static cpumask_t *tpmi_power_domain_mask;
static u16 *domain_die_map;
/* Lock to protect tpmi_power_domain_mask and tpmi_cpu_hash */
static DEFINE_MUTEX(tpmi_lock);
@ -152,6 +154,15 @@ cpumask_t *tpmi_get_power_domain_mask(int cpu_no)
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_power_domain_mask, "INTEL_TPMI_POWER_DOMAIN");
int tpmi_get_linux_die_id(int pkg_id, int domain_id)
{
if (pkg_id >= topology_max_packages() || domain_id >= MAX_POWER_DOMAINS)
return -EINVAL;
return domain_die_map[pkg_id * MAX_POWER_DOMAINS + domain_id];
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_linux_die_id, "INTEL_TPMI_POWER_DOMAIN");
static int tpmi_get_logical_id(unsigned int cpu, struct tpmi_cpu_info *info)
{
u64 data;
@ -189,6 +200,9 @@ static int tpmi_cpu_online(unsigned int cpu)
cpumask_set_cpu(cpu, &tpmi_power_domain_mask[index]);
hash_add(tpmi_cpu_hash, &info->hnode, info->punit_core_id);
domain_die_map[info->pkg_id * MAX_POWER_DOMAINS + info->punit_domain_id] =
topology_die_id(cpu);
return 0;
}
@ -212,17 +226,28 @@ static int __init tpmi_init(void)
if (!tpmi_power_domain_mask)
return -ENOMEM;
domain_die_map = kcalloc(size_mul(topology_max_packages(), MAX_POWER_DOMAINS),
sizeof(*domain_die_map), GFP_KERNEL);
if (!domain_die_map)
goto free_domain_mask;
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
"platform/x86/tpmi_power_domains:online",
tpmi_cpu_online, NULL);
if (ret < 0) {
kfree(tpmi_power_domain_mask);
return ret;
}
if (ret < 0)
goto free_domain_map;
tpmi_hp_state = ret;
return 0;
free_domain_map:
kfree(domain_die_map);
free_domain_mask:
kfree(tpmi_power_domain_mask);
return ret;
}
module_init(tpmi_init)
@ -230,6 +255,7 @@ static void __exit tpmi_exit(void)
{
cpuhp_remove_state(tpmi_hp_state);
kfree(tpmi_power_domain_mask);
kfree(domain_die_map);
}
module_exit(tpmi_exit)

1
drivers/platform/x86/intel/tpmi_power_domains.h
View file

@ -14,5 +14,6 @@ int tpmi_get_linux_cpu_number(int package_id, int die_id, int punit_core_id);
int tpmi_get_punit_core_number(int cpu_no);
int tpmi_get_power_domain_id(int cpu_no);
cpumask_t *tpmi_get_power_domain_mask(int cpu_no);
int tpmi_get_linux_die_id(int pkg_id, int domain_id);
#endif