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;
39	u8  saved_priority;
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];
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
74#define XICS_RM_NOTIFY_EOI	0x8
75	u32 rm_action;
76	struct kvm_vcpu *rm_kick_target;
77	struct kvmppc_icp *rm_resend_icp;
78	u32  rm_reject;
79	u32  rm_eoied_irq;
80
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;
86	/* Counters for handling ICP processing in real mode */
87	unsigned long n_check_resend;
88	unsigned long n_reject;
89
90	/* Debug stuff for real mode */
91	union kvmppc_icp_state rm_dbgstate;
92	struct kvm_vcpu *rm_dbgtgt;
93};
94
95struct kvmppc_ics {
96	arch_spinlock_t lock;
97	u16 icsid;
98	struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
99};
100
101struct kvmppc_xics {
102	struct kvm *kvm;
103	struct kvm_device *dev;
104	struct dentry *dentry;
105	u32 max_icsid;
106	bool real_mode;
107	bool real_mode_dbg;
108	u32 err_noics;
109	u32 err_noicp;
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 */
145