book3s_xics.h

  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 */
 36struct 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 */
 51union 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
 66struct 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
 97struct kvmppc_ics {
 98	arch_spinlock_t lock;
 99	u16 icsid;
100	struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
101};
102
103struct 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
115static 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
128static 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
145extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu);
146extern unsigned long xics_rm_h_xirr_x(struct kvm_vcpu *vcpu);
147extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
148			 unsigned long mfrr);
149extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr);
150extern 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 */