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// SPDX-License-Identifier: GPL-2.0-only
/*
* processor thermal device RFIM control
* Copyright (c) 2020, Intel Corporation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include "processor_thermal_device.h"
static struct rapl_if_priv rapl_mmio_priv;
static const struct rapl_mmio_regs rapl_mmio_default = {
.reg_unit = 0x5938,
.regs[RAPL_DOMAIN_PACKAGE] = { 0x59a0, 0x593c, 0x58f0, 0, 0x5930},
.regs[RAPL_DOMAIN_DRAM] = { 0x58e0, 0x58e8, 0x58ec, 0, 0},
.limits[RAPL_DOMAIN_PACKAGE] = 2,
.limits[RAPL_DOMAIN_DRAM] = 2,
};
static int rapl_mmio_cpu_online(unsigned int cpu)
{
struct rapl_package *rp;
/* mmio rapl supports package 0 only for now */
if (topology_physical_package_id(cpu))
return 0;
rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
if (!rp) {
rp = rapl_add_package(cpu, &rapl_mmio_priv);
if (IS_ERR(rp))
return PTR_ERR(rp);
}
cpumask_set_cpu(cpu, &rp->cpumask);
return 0;
}
static int rapl_mmio_cpu_down_prep(unsigned int cpu)
{
struct rapl_package *rp;
int lead_cpu;
rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
if (!rp)
return 0;
cpumask_clear_cpu(cpu, &rp->cpumask);
lead_cpu = cpumask_first(&rp->cpumask);
if (lead_cpu >= nr_cpu_ids)
rapl_remove_package(rp);
else if (rp->lead_cpu == cpu)
rp->lead_cpu = lead_cpu;
return 0;
}
static int rapl_mmio_read_raw(int cpu, struct reg_action *ra)
{
if (!ra->reg)
return -EINVAL;
ra->value = readq((void __iomem *)ra->reg);
ra->value &= ra->mask;
return 0;
}
static int rapl_mmio_write_raw(int cpu, struct reg_action *ra)
{
u64 val;
if (!ra->reg)
return -EINVAL;
val = readq((void __iomem *)ra->reg);
val &= ~ra->mask;
val |= ra->value;
writeq(val, (void __iomem *)ra->reg);
return 0;
}
int proc_thermal_rapl_add(struct pci_dev *pdev, struct proc_thermal_device *proc_priv)
{
const struct rapl_mmio_regs *rapl_regs = &rapl_mmio_default;
enum rapl_domain_reg_id reg;
enum rapl_domain_type domain;
int ret;
if (!rapl_regs)
return 0;
for (domain = RAPL_DOMAIN_PACKAGE; domain < RAPL_DOMAIN_MAX; domain++) {
for (reg = RAPL_DOMAIN_REG_LIMIT; reg < RAPL_DOMAIN_REG_MAX; reg++)
if (rapl_regs->regs[domain][reg])
rapl_mmio_priv.regs[domain][reg] =
(u64)proc_priv->mmio_base +
rapl_regs->regs[domain][reg];
rapl_mmio_priv.limits[domain] = rapl_regs->limits[domain];
}
rapl_mmio_priv.reg_unit = (u64)proc_priv->mmio_base + rapl_regs->reg_unit;
rapl_mmio_priv.read_raw = rapl_mmio_read_raw;
rapl_mmio_priv.write_raw = rapl_mmio_write_raw;
rapl_mmio_priv.control_type = powercap_register_control_type(NULL, "intel-rapl-mmio", NULL);
if (IS_ERR(rapl_mmio_priv.control_type)) {
pr_debug("failed to register powercap control_type.\n");
return PTR_ERR(rapl_mmio_priv.control_type);
}
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online",
rapl_mmio_cpu_online, rapl_mmio_cpu_down_prep);
if (ret < 0) {
powercap_unregister_control_type(rapl_mmio_priv.control_type);
rapl_mmio_priv.control_type = NULL;
return ret;
}
rapl_mmio_priv.pcap_rapl_online = ret;
return 0;
}
EXPORT_SYMBOL_GPL(proc_thermal_rapl_add);
void proc_thermal_rapl_remove(void)
{
if (IS_ERR_OR_NULL(rapl_mmio_priv.control_type))
return;
cpuhp_remove_state(rapl_mmio_priv.pcap_rapl_online);
powercap_unregister_control_type(rapl_mmio_priv.control_type);
}
EXPORT_SYMBOL_GPL(proc_thermal_rapl_remove);
MODULE_LICENSE("GPL v2");
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