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/*
* Copyright 2012 Michael Ellerman, IBM Corporation.
* Copyright 2012 Benjamin Herrenschmidt, IBM Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*/
#ifndef _KVM_PPC_BOOK3S_XICS_H
#define _KVM_PPC_BOOK3S_XICS_H
/*
* We use a two-level tree to store interrupt source information.
* There are up to 1024 ICS nodes, each of which can represent
* 1024 sources.
*/
#define KVMPPC_XICS_MAX_ICS_ID 1023
#define KVMPPC_XICS_ICS_SHIFT 10
#define KVMPPC_XICS_IRQ_PER_ICS (1 << KVMPPC_XICS_ICS_SHIFT)
#define KVMPPC_XICS_SRC_MASK (KVMPPC_XICS_IRQ_PER_ICS - 1)
/*
* Interrupt source numbers below this are reserved, for example
* 0 is "no interrupt", and 2 is used for IPIs.
*/
#define KVMPPC_XICS_FIRST_IRQ 16
#define KVMPPC_XICS_NR_IRQS ((KVMPPC_XICS_MAX_ICS_ID + 1) * \
KVMPPC_XICS_IRQ_PER_ICS)
/* Priority value to use for disabling an interrupt */
#define MASKED 0xff
/* State for one irq source */
struct ics_irq_state {
u32 number;
u32 server;
u8 priority;
u8 saved_priority; /* currently unused */
u8 resend;
u8 masked_pending;
u8 asserted; /* Only for LSI */
u8 exists;
};
/* Atomic ICP state, updated with a single compare & swap */
union kvmppc_icp_state {
unsigned long raw;
struct {
u8 out_ee:1;
u8 need_resend:1;
u8 cppr;
u8 mfrr;
u8 pending_pri;
u32 xisr;
};
};
/* One bit per ICS */
#define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
struct kvmppc_icp {
struct kvm_vcpu *vcpu;
unsigned long server_num;
union kvmppc_icp_state state;
unsigned long resend_map[ICP_RESEND_MAP_SIZE];
};
struct kvmppc_ics {
struct mutex lock;
u16 icsid;
struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
};
struct kvmppc_xics {
struct kvm *kvm;
struct dentry *dentry;
u32 max_icsid;
struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
};
static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
u32 nr)
{
struct kvm_vcpu *vcpu = NULL;
int i;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
return vcpu->arch.icp;
}
return NULL;
}
static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
u32 irq, u16 *source)
{
u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
u16 src = irq & KVMPPC_XICS_SRC_MASK;
struct kvmppc_ics *ics;
if (source)
*source = src;
if (icsid > KVMPPC_XICS_MAX_ICS_ID)
return NULL;
ics = xics->ics[icsid];
if (!ics)
return NULL;
return ics;
}
#endif /* _KVM_PPC_BOOK3S_XICS_H */
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