| Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2012 Michael Ellerman, IBM Corporation. |
| 3 | * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2, as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #ifndef _KVM_PPC_BOOK3S_XICS_H |
| 11 | #define _KVM_PPC_BOOK3S_XICS_H |
| 12 | |
| 13 | /* |
| 14 | * We use a two-level tree to store interrupt source information. |
| 15 | * There are up to 1024 ICS nodes, each of which can represent |
| 16 | * 1024 sources. |
| 17 | */ |
| 18 | #define KVMPPC_XICS_MAX_ICS_ID 1023 |
| 19 | #define KVMPPC_XICS_ICS_SHIFT 10 |
| 20 | #define KVMPPC_XICS_IRQ_PER_ICS (1 << KVMPPC_XICS_ICS_SHIFT) |
| 21 | #define KVMPPC_XICS_SRC_MASK (KVMPPC_XICS_IRQ_PER_ICS - 1) |
| 22 | |
| 23 | /* |
| 24 | * Interrupt source numbers below this are reserved, for example |
| 25 | * 0 is "no interrupt", and 2 is used for IPIs. |
| 26 | */ |
| 27 | #define KVMPPC_XICS_FIRST_IRQ 16 |
| 28 | #define KVMPPC_XICS_NR_IRQS ((KVMPPC_XICS_MAX_ICS_ID + 1) * \ |
| 29 | KVMPPC_XICS_IRQ_PER_ICS) |
| 30 | |
| 31 | /* Priority value to use for disabling an interrupt */ |
| 32 | #define MASKED 0xff |
| 33 | |
| 34 | /* State for one irq source */ |
| 35 | struct ics_irq_state { |
| 36 | u32 number; |
| 37 | u32 server; |
| 38 | u8 priority; |
| 39 | u8 saved_priority; /* currently unused */ |
| 40 | u8 resend; |
| 41 | u8 masked_pending; |
| 42 | u8 asserted; /* Only for LSI */ |
| 43 | u8 exists; |
| 44 | }; |
| 45 | |
| 46 | /* Atomic ICP state, updated with a single compare & swap */ |
| 47 | union kvmppc_icp_state { |
| 48 | unsigned long raw; |
| 49 | struct { |
| 50 | u8 out_ee:1; |
| 51 | u8 need_resend:1; |
| 52 | u8 cppr; |
| 53 | u8 mfrr; |
| 54 | u8 pending_pri; |
| 55 | u32 xisr; |
| 56 | }; |
| 57 | }; |
| 58 | |
| 59 | /* One bit per ICS */ |
| 60 | #define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1) |
| 61 | |
| 62 | struct kvmppc_icp { |
| 63 | struct kvm_vcpu *vcpu; |
| 64 | unsigned long server_num; |
| 65 | union kvmppc_icp_state state; |
| 66 | unsigned long resend_map[ICP_RESEND_MAP_SIZE]; |
| 67 | }; |
| 68 | |
| 69 | struct kvmppc_ics { |
| 70 | struct mutex lock; |
| 71 | u16 icsid; |
| 72 | struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; |
| 73 | }; |
| 74 | |
| 75 | struct kvmppc_xics { |
| 76 | struct kvm *kvm; |
| 77 | struct dentry *dentry; |
| 78 | u32 max_icsid; |
| 79 | struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1]; |
| 80 | }; |
| 81 | |
| 82 | static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm, |
| 83 | u32 nr) |
| 84 | { |
| 85 | struct kvm_vcpu *vcpu = NULL; |
| 86 | int i; |
| 87 | |
| 88 | kvm_for_each_vcpu(i, vcpu, kvm) { |
| 89 | if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num) |
| 90 | return vcpu->arch.icp; |
| 91 | } |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics, |
| 96 | u32 irq, u16 *source) |
| 97 | { |
| 98 | u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT; |
| 99 | u16 src = irq & KVMPPC_XICS_SRC_MASK; |
| 100 | struct kvmppc_ics *ics; |
| 101 | |
| 102 | if (source) |
| 103 | *source = src; |
| 104 | if (icsid > KVMPPC_XICS_MAX_ICS_ID) |
| 105 | return NULL; |
| 106 | ics = xics->ics[icsid]; |
| 107 | if (!ics) |
| 108 | return NULL; |
| 109 | return ics; |
| 110 | } |
| 111 | |
| 112 | |
| 113 | #endif /* _KVM_PPC_BOOK3S_XICS_H */ |