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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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25a2150bee
This makes it possible to use IRQFDs on platforms that use the XICS interrupt controller. To do this we implement kvm_irq_map_gsi() and kvm_irq_map_chip_pin() in book3s_xics.c, so as to provide a 1-1 mapping between global interrupt numbers and XICS interrupt source numbers. For now, all interrupts are mapped as "IRQCHIP" interrupts, and no MSI support is provided. This means that kvm_set_irq can now get called with level == 0 or 1 as well as the powerpc-specific values KVM_INTERRUPT_SET, KVM_INTERRUPT_UNSET and KVM_INTERRUPT_SET_LEVEL. We change ics_deliver_irq() to accept all those values, and remove its report_status argument, as it is always false, given that we don't support KVM_IRQ_LINE_STATUS. This also adds support for interrupt ack notifiers to the XICS code so that the IRQFD resampler functionality can be supported. Signed-off-by: Paul Mackerras <paulus@samba.org> Tested-by: Eric Auger <eric.auger@linaro.org> Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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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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/*
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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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/* 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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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 asserted; /* Only for LSI */
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u8 exists;
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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_REJECT 0x4
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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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u32 rm_reject;
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u32 rm_eoied_irq;
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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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struct mutex 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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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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#endif /* _KVM_PPC_BOOK3S_XICS_H */
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