xref: /openbmc/linux/arch/powerpc/kvm/book3s_xics.h (revision a784101f)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright 2012 Michael Ellerman, IBM Corporation.
4  * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation
5  */
6 
7 #ifndef _KVM_PPC_BOOK3S_XICS_H
8 #define _KVM_PPC_BOOK3S_XICS_H
9 
10 #ifdef CONFIG_KVM_XICS
11 /*
12  * We use a two-level tree to store interrupt source information.
13  * There are up to 1024 ICS nodes, each of which can represent
14  * 1024 sources.
15  */
16 #define KVMPPC_XICS_MAX_ICS_ID	1023
17 #define KVMPPC_XICS_ICS_SHIFT	10
18 #define KVMPPC_XICS_IRQ_PER_ICS	(1 << KVMPPC_XICS_ICS_SHIFT)
19 #define KVMPPC_XICS_SRC_MASK	(KVMPPC_XICS_IRQ_PER_ICS - 1)
20 
21 /*
22  * Interrupt source numbers below this are reserved, for example
23  * 0 is "no interrupt", and 2 is used for IPIs.
24  */
25 #define KVMPPC_XICS_FIRST_IRQ	16
26 #define KVMPPC_XICS_NR_IRQS	((KVMPPC_XICS_MAX_ICS_ID + 1) * \
27 				 KVMPPC_XICS_IRQ_PER_ICS)
28 
29 /* Priority value to use for disabling an interrupt */
30 #define MASKED	0xff
31 
32 #define PQ_PRESENTED	1
33 #define PQ_QUEUED	2
34 
35 /* State for one irq source */
36 struct ics_irq_state {
37 	u32 number;
38 	u32 server;
39 	u32 pq_state;
40 	u8  priority;
41 	u8  saved_priority;
42 	u8  resend;
43 	u8  masked_pending;
44 	u8  lsi;		/* level-sensitive interrupt */
45 	u8  exists;
46 	int intr_cpu;
47 	u32 host_irq;
48 };
49 
50 /* Atomic ICP state, updated with a single compare & swap */
51 union kvmppc_icp_state {
52 	unsigned long raw;
53 	struct {
54 		u8 out_ee:1;
55 		u8 need_resend:1;
56 		u8 cppr;
57 		u8 mfrr;
58 		u8 pending_pri;
59 		u32 xisr;
60 	};
61 };
62 
63 /* One bit per ICS */
64 #define ICP_RESEND_MAP_SIZE	(KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
65 
66 struct kvmppc_icp {
67 	struct kvm_vcpu *vcpu;
68 	unsigned long server_num;
69 	union kvmppc_icp_state state;
70 	unsigned long resend_map[ICP_RESEND_MAP_SIZE];
71 
72 	/* Real mode might find something too hard, here's the action
73 	 * it might request from virtual mode
74 	 */
75 #define XICS_RM_KICK_VCPU	0x1
76 #define XICS_RM_CHECK_RESEND	0x2
77 #define XICS_RM_NOTIFY_EOI	0x8
78 	u32 rm_action;
79 	struct kvm_vcpu *rm_kick_target;
80 	struct kvmppc_icp *rm_resend_icp;
81 	u32  rm_reject;
82 	u32  rm_eoied_irq;
83 
84 	/* Counters for each reason we exited real mode */
85 	unsigned long n_rm_kick_vcpu;
86 	unsigned long n_rm_check_resend;
87 	unsigned long n_rm_notify_eoi;
88 	/* Counters for handling ICP processing in real mode */
89 	unsigned long n_check_resend;
90 	unsigned long n_reject;
91 
92 	/* Debug stuff for real mode */
93 	union kvmppc_icp_state rm_dbgstate;
94 	struct kvm_vcpu *rm_dbgtgt;
95 };
96 
97 struct kvmppc_ics {
98 	arch_spinlock_t lock;
99 	u16 icsid;
100 	struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
101 };
102 
103 struct kvmppc_xics {
104 	struct kvm *kvm;
105 	struct kvm_device *dev;
106 	struct dentry *dentry;
107 	u32 max_icsid;
108 	bool real_mode;
109 	bool real_mode_dbg;
110 	u32 err_noics;
111 	u32 err_noicp;
112 	struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
113 };
114 
kvmppc_xics_find_server(struct kvm * kvm,u32 nr)115 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
116 							 u32 nr)
117 {
118 	struct kvm_vcpu *vcpu = NULL;
119 	unsigned long i;
120 
121 	kvm_for_each_vcpu(i, vcpu, kvm) {
122 		if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
123 			return vcpu->arch.icp;
124 	}
125 	return NULL;
126 }
127 
kvmppc_xics_find_ics(struct kvmppc_xics * xics,u32 irq,u16 * source)128 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
129 						      u32 irq, u16 *source)
130 {
131 	u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
132 	u16 src = irq & KVMPPC_XICS_SRC_MASK;
133 	struct kvmppc_ics *ics;
134 
135 	if (source)
136 		*source = src;
137 	if (icsid > KVMPPC_XICS_MAX_ICS_ID)
138 		return NULL;
139 	ics = xics->ics[icsid];
140 	if (!ics)
141 		return NULL;
142 	return ics;
143 }
144 
145 extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu);
146 extern unsigned long xics_rm_h_xirr_x(struct kvm_vcpu *vcpu);
147 extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
148 			 unsigned long mfrr);
149 extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr);
150 extern int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr);
151 
152 #endif /* CONFIG_KVM_XICS */
153 #endif /* _KVM_PPC_BOOK3S_XICS_H */
154