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| 3 |
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| 4 | #include <asm/mpam.h>
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| 5 |
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| 6 | #include <linux/arm_mpam.h>
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| 7 | #include <linux/cpu_pm.h>
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| 8 | #include <linux/jump_label.h>
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| 9 | #include <linux/percpu.h>
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| 10 |
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| 11 | DEFINE_STATIC_KEY_FALSE(mpam_enabled);
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| 12 | DEFINE_PER_CPU(u64, arm64_mpam_default);
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| 13 | DEFINE_PER_CPU(u64, arm64_mpam_current);
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| 14 |
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| 15 | u64 arm64_mpam_global_default;
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| 16 |
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| 17 | static int mpam_pm_notifier(struct notifier_block *self,
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| 18 | unsigned long cmd, void *v)
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| 19 | {
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| 20 | u64 regval;
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| 21 | int cpu = smp_processor_id();
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| 22 |
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| 23 | switch (cmd) {
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| 24 | case CPU_PM_EXIT:
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| 25 | |
| 26 | * Don't use mpam_thread_switch() as the system register
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| 27 | * value has changed under our feet.
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| 28 |
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| 29 | regval = READ_ONCE(per_cpu(arm64_mpam_current, cpu));
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| 30 | write_sysreg_s(regval | MPAM1_EL1_MPAMEN, SYS_MPAM1_EL1);
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| 31 | if (system_supports_sme()) {
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| 32 | write_sysreg_s(regval & (MPAMSM_EL1_PARTID_D | MPAMSM_EL1_PMG_D),
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| 33 | SYS_MPAMSM_EL1);
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| 34 | }
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| 35 | isb();
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| 36 |
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| 37 | write_sysreg_s(regval, SYS_MPAM0_EL1);
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| 38 |
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| 39 | return NOTIFY_OK;
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| 40 | default:
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| 41 | return NOTIFY_DONE;
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| 42 | }
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| 43 | }
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| 44 |
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| 45 | static struct notifier_block mpam_pm_nb = {
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| 46 | .notifier_call = mpam_pm_notifier,
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| 47 | };
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| 48 |
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| 49 | static int __init arm64_mpam_register_cpus(void)
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| 50 | {
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| 51 | u64 mpamidr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1);
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| 52 | u16 partid_max = FIELD_GET(MPAMIDR_EL1_PARTID_MAX, mpamidr);
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| 53 | u8 pmg_max = FIELD_GET(MPAMIDR_EL1_PMG_MAX, mpamidr);
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| 54 |
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| 55 | if (!system_supports_mpam())
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| 56 | return 0;
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| 57 |
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| 58 | cpu_pm_register_notifier(&mpam_pm_nb);
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| 59 | return mpam_register_requestor(partid_max, pmg_max);
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| 60 | }
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| 61 |
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| 62 | arch_initcall(arm64_mpam_register_cpus)
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