| 1 |
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| 2 | |
| 3 | * Copyright (C) 2012,2013 - ARM Ltd
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| 4 | * Author: Marc Zyngier <[email protected]>
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| 5 |
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| 6 |
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| 7 | #ifndef __KVM_ARM_PSCI_H__
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| 8 | #define __KVM_ARM_PSCI_H__
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| 9 |
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| 10 | #include <linux/kvm_host.h>
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| 11 | #include <uapi/linux/psci.h>
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| 12 |
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| 13 | #define KVM_ARM_PSCI_0_1 PSCI_VERSION(0, 1)
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| 14 | #define KVM_ARM_PSCI_0_2 PSCI_VERSION(0, 2)
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| 15 | #define KVM_ARM_PSCI_1_0 PSCI_VERSION(1, 0)
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| 16 | #define KVM_ARM_PSCI_1_1 PSCI_VERSION(1, 1)
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| 17 | #define KVM_ARM_PSCI_1_2 PSCI_VERSION(1, 2)
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| 18 | #define KVM_ARM_PSCI_1_3 PSCI_VERSION(1, 3)
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| 19 |
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| 20 | #define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_3
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| 21 |
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| 22 | static inline int kvm_psci_version(struct kvm_vcpu *vcpu)
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| 23 | {
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| 24 | |
| 25 | * Our PSCI implementation stays the same across versions from
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| 26 | * v0.2 onward, only adding the few mandatory functions (such
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| 27 | * as FEATURES with 1.0) that are required by newer
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| 28 | * revisions. It is thus safe to return the latest, unless
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| 29 | * userspace has instructed us otherwise.
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| 30 |
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| 31 | if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2)) {
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| 32 | if (vcpu->kvm->arch.psci_version)
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| 33 | return vcpu->kvm->arch.psci_version;
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| 34 |
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| 35 | return KVM_ARM_PSCI_LATEST;
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| 36 | }
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| 37 |
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| 38 | return KVM_ARM_PSCI_0_1;
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| 39 | }
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| 40 |
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| 41 |
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| 42 | static inline void kvm_psci_narrow_to_32bit(struct kvm_vcpu *vcpu)
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| 43 | {
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| 44 | int i;
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| 45 |
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| 46 | |
| 47 | * Zero the input registers' upper 32 bits. They will be fully
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| 48 | * zeroed on exit, so we're fine changing them in place.
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| 49 |
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| 50 | for (i = 1; i < 4; i++)
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| 51 | vcpu_set_reg(vcpu, i, lower_32_bits(vcpu_get_reg(vcpu, i)));
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| 52 | }
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| 53 |
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| 54 | static inline bool kvm_psci_valid_affinity(struct kvm_vcpu *vcpu,
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| 55 | unsigned long affinity)
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| 56 | {
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| 57 | return !(affinity & ~MPIDR_HWID_BITMASK);
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| 58 | }
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| 59 |
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| 60 | static inline unsigned long kvm_psci_affinity_mask(unsigned long affinity_level)
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| 61 | {
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| 62 | if (affinity_level <= 3)
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| 63 | return MPIDR_HWID_BITMASK &
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| 64 | ~((0x1UL << (affinity_level * MPIDR_LEVEL_BITS)) - 1);
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| 65 |
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| 66 | return 0;
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| 67 | }
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| 68 |
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| 69 | int kvm_psci_call(struct kvm_vcpu *vcpu);
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| 70 |
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| 71 | #endif
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