63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2025 Arm Ltd. */
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#include <asm/mpam.h>
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#include <linux/arm_mpam.h>
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#include <linux/cpu_pm.h>
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#include <linux/jump_label.h>
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#include <linux/percpu.h>
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DEFINE_STATIC_KEY_FALSE(mpam_enabled);
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DEFINE_PER_CPU(u64, arm64_mpam_default);
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DEFINE_PER_CPU(u64, arm64_mpam_current);
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u64 arm64_mpam_global_default;
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static int mpam_pm_notifier(struct notifier_block *self,
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unsigned long cmd, void *v)
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{
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u64 regval;
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int cpu = smp_processor_id();
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switch (cmd) {
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case CPU_PM_EXIT:
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/*
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* Don't use mpam_thread_switch() as the system register
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* value has changed under our feet.
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*/
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regval = READ_ONCE(per_cpu(arm64_mpam_current, cpu));
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write_sysreg_s(regval | MPAM1_EL1_MPAMEN, SYS_MPAM1_EL1);
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if (system_supports_sme()) {
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write_sysreg_s(regval & (MPAMSM_EL1_PARTID_D | MPAMSM_EL1_PMG_D),
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SYS_MPAMSM_EL1);
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}
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isb();
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write_sysreg_s(regval, SYS_MPAM0_EL1);
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return NOTIFY_OK;
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default:
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return NOTIFY_DONE;
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}
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}
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static struct notifier_block mpam_pm_nb = {
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.notifier_call = mpam_pm_notifier,
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};
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static int __init arm64_mpam_register_cpus(void)
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{
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u64 mpamidr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1);
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u16 partid_max = FIELD_GET(MPAMIDR_EL1_PARTID_MAX, mpamidr);
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u8 pmg_max = FIELD_GET(MPAMIDR_EL1_PMG_MAX, mpamidr);
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if (!system_supports_mpam())
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return 0;
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cpu_pm_register_notifier(&mpam_pm_nb);
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return mpam_register_requestor(partid_max, pmg_max);
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}
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/* Must occur before mpam_msc_driver_init() from subsys_initcall() */
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arch_initcall(arm64_mpam_register_cpus)
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