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// SPDX-License-Identifier: GPL-2.0-only
/*
* Mapping of TPMI power domains CPU mapping
*
* Copyright (c) 2024, Intel Corporation.
*/
#include <linux/bitfield.h>
#include <linux/cleanup.h>
#include <linux/cpuhotplug.h>
#include <linux/cpumask.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/hashtable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/overflow.h>
#include <linux/slab.h>
#include <linux/topology.h>
#include <linux/types.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/msr.h>
#include "tpmi_power_domains.h"
#define MSR_PM_LOGICAL_ID 0x54
/*
* Struct of MSR 0x54
* [15:11] PM_DOMAIN_ID
* [10:3] MODULE_ID (aka IDI_AGENT_ID)
* [2:0] LP_ID
* For Atom:
* [2] Always 0
* [1:0] core ID within module
* For Core
* [2:1] Always 0
* [0] thread ID
*/
#define LP_ID_MASK GENMASK_ULL(2, 0)
#define MODULE_ID_MASK GENMASK_ULL(10, 3)
#define PM_DOMAIN_ID_MASK GENMASK_ULL(15, 11)
/**
* struct tpmi_cpu_info - Mapping information for a CPU
* @hnode: Used to add mapping information to hash list
* @linux_cpu: Linux CPU number
* @pkg_id: Package ID of this CPU
* @punit_thread_id: Punit thread id of this CPU
* @punit_core_id: Punit core id
* @punit_domain_id: Power domain id from Punit
*
* Structure to store mapping information for a Linux CPU
* to a Punit core, thread and power domain.
*/
struct tpmi_cpu_info {
struct hlist_node hnode;
int linux_cpu;
u8 pkg_id;
u8 punit_thread_id;
u8 punit_core_id;
u8 punit_domain_id;
};
static DEFINE_PER_CPU(struct tpmi_cpu_info, tpmi_cpu_info);
/* The dynamically assigned cpu hotplug state to free later */
static enum cpuhp_state tpmi_hp_state __read_mostly;
#define MAX_POWER_DOMAINS 8
static cpumask_t *tpmi_power_domain_mask;
/* Lock to protect tpmi_power_domain_mask and tpmi_cpu_hash */
static DEFINE_MUTEX(tpmi_lock);
static const struct x86_cpu_id tpmi_cpu_ids[] = {
X86_MATCH_VFM(INTEL_GRANITERAPIDS_X, NULL),
X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X, NULL),
X86_MATCH_VFM(INTEL_ATOM_CRESTMONT, NULL),
X86_MATCH_VFM(INTEL_GRANITERAPIDS_D, NULL),
X86_MATCH_VFM(INTEL_PANTHERCOVE_X, NULL),
{}
};
MODULE_DEVICE_TABLE(x86cpu, tpmi_cpu_ids);
static DECLARE_HASHTABLE(tpmi_cpu_hash, 8);
static bool tpmi_domain_is_valid(struct tpmi_cpu_info *info)
{
return info->pkg_id < topology_max_packages() &&
info->punit_domain_id < MAX_POWER_DOMAINS;
}
int tpmi_get_linux_cpu_number(int package_id, int domain_id, int punit_core_id)
{
struct tpmi_cpu_info *info;
int ret = -EINVAL;
guard(mutex)(&tpmi_lock);
hash_for_each_possible(tpmi_cpu_hash, info, hnode, punit_core_id) {
if (info->punit_domain_id == domain_id && info->pkg_id == package_id) {
ret = info->linux_cpu;
break;
}
}
return ret;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_linux_cpu_number, INTEL_TPMI_POWER_DOMAIN);
int tpmi_get_punit_core_number(int cpu_no)
{
if (cpu_no >= num_possible_cpus())
return -EINVAL;
return per_cpu(tpmi_cpu_info, cpu_no).punit_core_id;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_punit_core_number, INTEL_TPMI_POWER_DOMAIN);
int tpmi_get_power_domain_id(int cpu_no)
{
if (cpu_no >= num_possible_cpus())
return -EINVAL;
return per_cpu(tpmi_cpu_info, cpu_no).punit_domain_id;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_power_domain_id, INTEL_TPMI_POWER_DOMAIN);
cpumask_t *tpmi_get_power_domain_mask(int cpu_no)
{
struct tpmi_cpu_info *info;
cpumask_t *mask;
int index;
if (cpu_no >= num_possible_cpus())
return NULL;
info = &per_cpu(tpmi_cpu_info, cpu_no);
if (!tpmi_domain_is_valid(info))
return NULL;
index = info->pkg_id * MAX_POWER_DOMAINS + info->punit_domain_id;
guard(mutex)(&tpmi_lock);
mask = &tpmi_power_domain_mask[index];
return mask;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_power_domain_mask, INTEL_TPMI_POWER_DOMAIN);
static int tpmi_get_logical_id(unsigned int cpu, struct tpmi_cpu_info *info)
{
u64 data;
int ret;
ret = rdmsrl_safe(MSR_PM_LOGICAL_ID, &data);
if (ret)
return ret;
info->punit_domain_id = FIELD_GET(PM_DOMAIN_ID_MASK, data);
if (info->punit_domain_id >= MAX_POWER_DOMAINS)
return -EINVAL;
info->punit_thread_id = FIELD_GET(LP_ID_MASK, data);
info->punit_core_id = FIELD_GET(MODULE_ID_MASK, data);
info->pkg_id = topology_physical_package_id(cpu);
info->linux_cpu = cpu;
return 0;
}
static int tpmi_cpu_online(unsigned int cpu)
{
struct tpmi_cpu_info *info = &per_cpu(tpmi_cpu_info, cpu);
int ret, index;
/* Don't fail CPU online for some bad mapping of CPUs */
ret = tpmi_get_logical_id(cpu, info);
if (ret)
return 0;
index = info->pkg_id * MAX_POWER_DOMAINS + info->punit_domain_id;
guard(mutex)(&tpmi_lock);
cpumask_set_cpu(cpu, &tpmi_power_domain_mask[index]);
hash_add(tpmi_cpu_hash, &info->hnode, info->punit_core_id);
return 0;
}
static int __init tpmi_init(void)
{
const struct x86_cpu_id *id;
u64 data;
int ret;
id = x86_match_cpu(tpmi_cpu_ids);
if (!id)
return -ENODEV;
/* Check for MSR 0x54 presence */
ret = rdmsrl_safe(MSR_PM_LOGICAL_ID, &data);
if (ret)
return ret;
tpmi_power_domain_mask = kcalloc(size_mul(topology_max_packages(), MAX_POWER_DOMAINS),
sizeof(*tpmi_power_domain_mask), GFP_KERNEL);
if (!tpmi_power_domain_mask)
return -ENOMEM;
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;
}
tpmi_hp_state = ret;
return 0;
}
module_init(tpmi_init)
static void __exit tpmi_exit(void)
{
cpuhp_remove_state(tpmi_hp_state);
kfree(tpmi_power_domain_mask);
}
module_exit(tpmi_exit)
MODULE_DESCRIPTION("TPMI Power Domains Mapping");
MODULE_LICENSE("GPL");
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