153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
/*
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* Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/platform/tegra/tegra18_cpu_map.h>
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#include <linux/platform/tegra/tegra-cpu.h>
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#include <linux/cpuhotplug.h>
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enum cputype_t {
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INVALID = 0x00,
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CARMEL = 0x1,
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DENVER,
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A57,
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OTHERS,
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CPUTYPE_MAX = OTHERS + 1,
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CPUTYPE_FORCE_U32 = 0xFFFFFFFF
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};
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static struct kobject *tegra_cpu_type;
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static struct kobject *tegra_cpu[CPUTYPE_MAX];
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static enum cputype_t cpu_to_type[NR_CPUS];
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static enum cpuhp_state assigned_cpu_state;
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static struct kobject *create_dir(const char *name, struct kobject *parent)
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{
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pr_debug("%s: about to create %s with parent %s\n",
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__func__, name, kobject_name(parent));
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return kobject_create_and_add(name, parent);
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}
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static void remove_dir(struct kobject *obj)
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{
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if (!obj)
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return;
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pr_debug("%s: removing %s\n", __func__, kobject_name(obj));
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kobject_put(obj);
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}
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static int tegra_cpu_prepare_down(unsigned int cpu)
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{
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char name[8];
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int i;
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enum cputype_t cpu_type;
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pr_debug("%s: cpu = %d\n", __func__, cpu);
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cpu_type = cpu_to_type[cpu];
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if (!tegra_cpu[cpu_type])
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return -ENODEV;
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snprintf(name, sizeof(name), "cpu%d", cpu);
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sysfs_remove_link(tegra_cpu[cpu_type], name);
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cpu_to_type[cpu] = INVALID;
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for_each_possible_cpu(i) {
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if (cpu_to_type[i] == cpu_type)
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return 0;
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}
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remove_dir(tegra_cpu[cpu_type]);
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return 0;
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}
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static int tegra_cpu_online(unsigned int cpu)
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{
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struct device *target;
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enum cputype_t cpu_type;
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char *cpu_type_str;
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int ret;
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pr_debug("%s: cpu = %d\n", __func__, cpu);
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target = get_cpu_device(cpu);
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if (!target)
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return -ENODEV;
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if (tegra_is_cpu_carmel(cpu)) {
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cpu_type = CARMEL;
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cpu_type_str = "carmel";
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} else if (tegra18_is_cpu_denver(cpu)) {
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cpu_type = DENVER;
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cpu_type_str = "denver";
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} else if (tegra18_is_cpu_arm(cpu)) {
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cpu_type = A57;
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cpu_type_str = "a57";
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} else {
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cpu_type = OTHERS;
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cpu_type_str = "others";
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}
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if (!tegra_cpu[cpu_type]) {
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tegra_cpu[cpu_type] = create_dir(cpu_type_str, tegra_cpu_type);
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if (tegra_cpu[cpu_type] == NULL)
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return -ENOMEM;
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}
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ret = sysfs_create_link(tegra_cpu[cpu_type],
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&target->kobj, dev_name(target));
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if (ret)
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return ret;
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cpu_to_type[cpu] = cpu_type;
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return 0;
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}
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static int __init tegra_cpu_sysfs_init(void)
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{
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int ret = -ENOMEM;
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tegra_cpu_type = create_dir("tegra_cpu_type",
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get_cpu_device(smp_processor_id())->kobj.parent);
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if (!tegra_cpu_type)
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goto err;
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ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
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"cpu/tegra_cpu_sysfs:online", tegra_cpu_online, tegra_cpu_prepare_down);
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if (ret < 0) {
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remove_dir(tegra_cpu_type);
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goto err;
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}
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assigned_cpu_state = ret;
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ret = 0;
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err:
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return ret;
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}
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module_init(tegra_cpu_sysfs_init);
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static void __exit tegra_cpu_sysfs_exit(void)
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{
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cpuhp_remove_state(assigned_cpu_state);
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remove_dir(tegra_cpu_type);
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}
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module_exit(tegra_cpu_sysfs_exit);
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MODULE_AUTHOR("Achal Verma <achalv@nvidia.com>");
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MODULE_DESCRIPTION("Tegra CPU Topology sysfs");
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MODULE_LICENSE("GPL v2");
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