| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright 2012 Michael Ellerman, IBM Corporation. |
| * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation |
| */ |
| |
| #ifndef _KVM_PPC_BOOK3S_XICS_H |
| #define _KVM_PPC_BOOK3S_XICS_H |
| |
| #ifdef CONFIG_KVM_XICS |
| /* |
| * 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 |
| |
| #define PQ_PRESENTED 1 |
| #define PQ_QUEUED 2 |
| |
| /* State for one irq source */ |
| struct ics_irq_state { |
| u32 number; |
| u32 server; |
| u32 pq_state; |
| u8 priority; |
| u8 saved_priority; |
| u8 resend; |
| u8 masked_pending; |
| u8 lsi; /* level-sensitive interrupt */ |
| u8 exists; |
| int intr_cpu; |
| u32 host_irq; |
| }; |
| |
| /* 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]; |
| |
| /* Real mode might find something too hard, here's the action |
| * it might request from virtual mode |
| */ |
| #define XICS_RM_KICK_VCPU 0x1 |
| #define XICS_RM_CHECK_RESEND 0x2 |
| #define XICS_RM_NOTIFY_EOI 0x8 |
| u32 rm_action; |
| struct kvm_vcpu *rm_kick_target; |
| struct kvmppc_icp *rm_resend_icp; |
| u32 rm_reject; |
| u32 rm_eoied_irq; |
| |
| /* Counters for each reason we exited real mode */ |
| unsigned long n_rm_kick_vcpu; |
| unsigned long n_rm_check_resend; |
| unsigned long n_rm_notify_eoi; |
| /* Counters for handling ICP processing in real mode */ |
| unsigned long n_check_resend; |
| unsigned long n_reject; |
| |
| /* Debug stuff for real mode */ |
| union kvmppc_icp_state rm_dbgstate; |
| struct kvm_vcpu *rm_dbgtgt; |
| }; |
| |
| struct kvmppc_ics { |
| arch_spinlock_t lock; |
| u16 icsid; |
| struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; |
| }; |
| |
| struct kvmppc_xics { |
| struct kvm *kvm; |
| struct kvm_device *dev; |
| struct dentry *dentry; |
| u32 max_icsid; |
| bool real_mode; |
| bool real_mode_dbg; |
| u32 err_noics; |
| u32 err_noicp; |
| 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; |
| unsigned long 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; |
| } |
| |
| extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu); |
| extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server, |
| unsigned long mfrr); |
| extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr); |
| extern int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr); |
| |
| #endif /* CONFIG_KVM_XICS */ |
| #endif /* _KVM_PPC_BOOK3S_XICS_H */ |