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152 lines
3.6 KiB
152 lines
3.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright 2012 Michael Ellerman, IBM Corporation. |
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* Copyright 2012 Benjamin Herrenschmidt, IBM Corporation |
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*/ |
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#ifndef _KVM_PPC_BOOK3S_XICS_H |
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#define _KVM_PPC_BOOK3S_XICS_H |
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#ifdef CONFIG_KVM_XICS |
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/* |
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* We use a two-level tree to store interrupt source information. |
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* There are up to 1024 ICS nodes, each of which can represent |
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* 1024 sources. |
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*/ |
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#define KVMPPC_XICS_MAX_ICS_ID 1023 |
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#define KVMPPC_XICS_ICS_SHIFT 10 |
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#define KVMPPC_XICS_IRQ_PER_ICS (1 << KVMPPC_XICS_ICS_SHIFT) |
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#define KVMPPC_XICS_SRC_MASK (KVMPPC_XICS_IRQ_PER_ICS - 1) |
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/* |
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* Interrupt source numbers below this are reserved, for example |
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* 0 is "no interrupt", and 2 is used for IPIs. |
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*/ |
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#define KVMPPC_XICS_FIRST_IRQ 16 |
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#define KVMPPC_XICS_NR_IRQS ((KVMPPC_XICS_MAX_ICS_ID + 1) * \ |
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KVMPPC_XICS_IRQ_PER_ICS) |
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/* Priority value to use for disabling an interrupt */ |
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#define MASKED 0xff |
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#define PQ_PRESENTED 1 |
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#define PQ_QUEUED 2 |
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/* State for one irq source */ |
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struct ics_irq_state { |
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u32 number; |
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u32 server; |
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u32 pq_state; |
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u8 priority; |
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u8 saved_priority; |
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u8 resend; |
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u8 masked_pending; |
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u8 lsi; /* level-sensitive interrupt */ |
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u8 exists; |
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int intr_cpu; |
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u32 host_irq; |
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}; |
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/* Atomic ICP state, updated with a single compare & swap */ |
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union kvmppc_icp_state { |
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unsigned long raw; |
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struct { |
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u8 out_ee:1; |
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u8 need_resend:1; |
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u8 cppr; |
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u8 mfrr; |
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u8 pending_pri; |
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u32 xisr; |
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}; |
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}; |
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/* One bit per ICS */ |
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#define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1) |
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struct kvmppc_icp { |
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struct kvm_vcpu *vcpu; |
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unsigned long server_num; |
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union kvmppc_icp_state state; |
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unsigned long resend_map[ICP_RESEND_MAP_SIZE]; |
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/* Real mode might find something too hard, here's the action |
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* it might request from virtual mode |
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*/ |
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#define XICS_RM_KICK_VCPU 0x1 |
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#define XICS_RM_CHECK_RESEND 0x2 |
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#define XICS_RM_NOTIFY_EOI 0x8 |
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u32 rm_action; |
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struct kvm_vcpu *rm_kick_target; |
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struct kvmppc_icp *rm_resend_icp; |
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u32 rm_reject; |
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u32 rm_eoied_irq; |
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/* Counters for each reason we exited real mode */ |
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unsigned long n_rm_kick_vcpu; |
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unsigned long n_rm_check_resend; |
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unsigned long n_rm_notify_eoi; |
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/* Counters for handling ICP processing in real mode */ |
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unsigned long n_check_resend; |
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unsigned long n_reject; |
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/* Debug stuff for real mode */ |
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union kvmppc_icp_state rm_dbgstate; |
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struct kvm_vcpu *rm_dbgtgt; |
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}; |
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struct kvmppc_ics { |
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arch_spinlock_t lock; |
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u16 icsid; |
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struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; |
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}; |
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struct kvmppc_xics { |
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struct kvm *kvm; |
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struct kvm_device *dev; |
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struct dentry *dentry; |
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u32 max_icsid; |
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bool real_mode; |
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bool real_mode_dbg; |
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u32 err_noics; |
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u32 err_noicp; |
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struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1]; |
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}; |
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static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm, |
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u32 nr) |
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{ |
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struct kvm_vcpu *vcpu = NULL; |
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int i; |
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kvm_for_each_vcpu(i, vcpu, kvm) { |
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if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num) |
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return vcpu->arch.icp; |
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} |
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return NULL; |
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} |
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static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics, |
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u32 irq, u16 *source) |
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{ |
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u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT; |
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u16 src = irq & KVMPPC_XICS_SRC_MASK; |
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struct kvmppc_ics *ics; |
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if (source) |
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*source = src; |
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if (icsid > KVMPPC_XICS_MAX_ICS_ID) |
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return NULL; |
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ics = xics->ics[icsid]; |
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if (!ics) |
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return NULL; |
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return ics; |
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} |
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extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu); |
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extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server, |
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unsigned long mfrr); |
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extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr); |
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extern int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr); |
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#endif /* CONFIG_KVM_XICS */ |
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#endif /* _KVM_PPC_BOOK3S_XICS_H */
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