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gerrit-public.fairphone.software / kernel / msm-4.9 / 3db9ab0b6d8a293435a78c048f877099e040f72c / . / arch / powerpc / kvm / book3s_xics.h
blob: 56ea44f9867fa6a59364e2c252bf57e4cbfc1da5 [file] [log] [blame]
Benjamin Herrenschmidtbc5ad3f2013-04-17 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 */
35struct ics_irq_state {
36 u32 number;
37 u32 server;
38 u8 priority;
Paul Mackerrasd19bd8622013-04-17 20:32:04 +0000[diff] [blame]39 u8 saved_priority;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]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 */
47union 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
62struct 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];
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]67
68 /* Real mode might find something too hard, here's the action
69 * it might request from virtual mode
70 */
71#define XICS_RM_KICK_VCPU 0x1
72#define XICS_RM_CHECK_RESEND 0x2
73#define XICS_RM_REJECT 0x4
Paul Mackerras25a2150b2014-06-30 20:51:14 +1000[diff] [blame]74#define XICS_RM_NOTIFY_EOI 0x8
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]75 u32 rm_action;
76 struct kvm_vcpu *rm_kick_target;
Suresh E. Warrier5b88cda2014-11-03 15:51:59 +1100[diff] [blame]77 struct kvmppc_icp *rm_resend_icp;
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]78 u32 rm_reject;
Paul Mackerras25a2150b2014-06-30 20:51:14 +1000[diff] [blame]79 u32 rm_eoied_irq;
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]80
Suresh E. Warrier878610f2015-03-20 20:39:45 +1100[diff] [blame]81 /* Counters for each reason we exited real mode */
82 unsigned long n_rm_kick_vcpu;
83 unsigned long n_rm_check_resend;
84 unsigned long n_rm_reject;
85 unsigned long n_rm_notify_eoi;
Suresh Warrier6e0365b2015-03-20 20:39:48 +1100[diff] [blame]86 /* Counters for handling ICP processing in real mode */
87 unsigned long n_check_resend;
88 unsigned long n_reject;
Suresh E. Warrier878610f2015-03-20 20:39:45 +1100[diff] [blame]89
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]90 /* Debug stuff for real mode */
91 union kvmppc_icp_state rm_dbgstate;
92 struct kvm_vcpu *rm_dbgtgt;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]93};
94
95struct kvmppc_ics {
Suresh Warrier34cb7952015-03-20 20:39:46 +1100[diff] [blame]96 arch_spinlock_t lock;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]97 u16 icsid;
98 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
99};
100
101struct kvmppc_xics {
102 struct kvm *kvm;
Paul Mackerras5975a2e2013-04-27 00:28:37 +0000[diff] [blame]103 struct kvm_device *dev;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]104 struct dentry *dentry;
105 u32 max_icsid;
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]106 bool real_mode;
107 bool real_mode_dbg;
Suresh Warrier6e0365b2015-03-20 20:39:48 +1100[diff] [blame]108 u32 err_noics;
109 u32 err_noicp;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]110 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
111};
112
113static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
114 u32 nr)
115{
116 struct kvm_vcpu *vcpu = NULL;
117 int i;
118
119 kvm_for_each_vcpu(i, vcpu, kvm) {
120 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
121 return vcpu->arch.icp;
122 }
123 return NULL;
124}
125
126static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
127 u32 irq, u16 *source)
128{
129 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
130 u16 src = irq & KVMPPC_XICS_SRC_MASK;
131 struct kvmppc_ics *ics;
132
133 if (source)
134 *source = src;
135 if (icsid > KVMPPC_XICS_MAX_ICS_ID)
136 return NULL;
137 ics = xics->ics[icsid];
138 if (!ics)
139 return NULL;
140 return ics;
141}
142
143
144#endif /* _KVM_PPC_BOOK3S_XICS_H */