1 // SPDX-License-Identifier: GPL-2.0-only
3  * Intel Running Average Power Limit (RAPL) Driver via MSR interface
26 #include <asm/intel-family.h>
54 	.limits[RAPL_DOMAIN_PACKAGE] = BIT(POWER_LIMIT2),
55 	.limits[RAPL_DOMAIN_PLATFORM] = BIT(POWER_LIMIT2),
65 /* Handles CPU hotplug on multi-socket systems.
70  * per-domain level.
82 	cpumask_set_cpu(cpu, &rp->cpumask);  in rapl_cpu_online()
95 	cpumask_clear_cpu(cpu, &rp->cpumask);  in rapl_cpu_down_prep()
96 	lead_cpu = cpumask_first(&rp->cpumask);  in rapl_cpu_down_prep()
99 	else if (rp->lead_cpu == cpu)  in rapl_cpu_down_prep()
100 		rp->lead_cpu = lead_cpu;  in rapl_cpu_down_prep()
106 	if (rdmsrl_safe_on_cpu(cpu, ra->reg.msr, &ra->value)) {  in rapl_msr_read_raw()
107 		pr_debug("failed to read msr 0x%x on cpu %d\n", ra->reg.msr, cpu);  in rapl_msr_read_raw()
108 		return -EIO;  in rapl_msr_read_raw()
110 	ra->value &= ra->mask;  in rapl_msr_read_raw()
119 	ra->err = rdmsrl_safe(ra->reg.msr, &val);  in rapl_msr_update_func()
120 	if (ra->err)  in rapl_msr_update_func()
123 	val &= ~ra->mask;  in rapl_msr_update_func()
124 	val |= ra->value;  in rapl_msr_update_func()
126 	ra->err = wrmsrl_safe(ra->reg.msr, val);  in rapl_msr_update_func()
137 	return ra->err;  in rapl_msr_write_raw()
169 		pr_err("intel-rapl does not support CPU vendor %d\n", boot_cpu_data.x86_vendor);  in rapl_msr_probe()
170 		return -ENODEV;  in rapl_msr_probe()
172 	rapl_msr_priv->read_raw = rapl_msr_read_raw;  in rapl_msr_probe()
173 	rapl_msr_priv->write_raw = rapl_msr_write_raw;  in rapl_msr_probe()
176 		rapl_msr_priv->limits[RAPL_DOMAIN_PACKAGE] |= BIT(POWER_LIMIT4);  in rapl_msr_probe()
177 		rapl_msr_priv->regs[RAPL_DOMAIN_PACKAGE][RAPL_DOMAIN_REG_PL4].msr =  in rapl_msr_probe()
182 	rapl_msr_priv->control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);  in rapl_msr_probe()
183 	if (IS_ERR(rapl_msr_priv->control_type)) {  in rapl_msr_probe()
185 		return PTR_ERR(rapl_msr_priv->control_type);  in rapl_msr_probe()
192 	rapl_msr_priv->pcap_rapl_online = ret;  in rapl_msr_probe()
198 		powercap_unregister_control_type(rapl_msr_priv->control_type);  in rapl_msr_probe()
204 	cpuhp_remove_state(rapl_msr_priv->pcap_rapl_online);  in rapl_msr_remove()
205 	powercap_unregister_control_type(rapl_msr_priv->control_type);  in rapl_msr_remove()
225 MODULE_DESCRIPTION("Driver for Intel RAPL (Running Average Power Limit) control via MSR interface");