arch/powerpc/kvm/book3s_xics.h

   1 /*
   2  * Copyright 2012 Michael Ellerman, IBM Corporation.
   3  * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #ifndef _KVM_PPC_BOOK3S_XICS_H
  11 #define _KVM_PPC_BOOK3S_XICS_H
  12
  13 /*
  14  * We use a two-level tree to store interrupt source information.
  15  * There are up to 1024 ICS nodes, each of which can represent
  16  * 1024 sources.
  17  */
  18 #define KVMPPC_XICS_MAX_ICS_ID  1023
  19 #define KVMPPC_XICS_ICS_SHIFT   10
  20 #define KVMPPC_XICS_IRQ_PER_ICS (1 << KVMPPC_XICS_ICS_SHIFT)
  21 #define KVMPPC_XICS_SRC_MASK    (KVMPPC_XICS_IRQ_PER_ICS - 1)
  22
  23 /*
  24  * Interrupt source numbers below this are reserved, for example
  25  * 0 is "no interrupt", and 2 is used for IPIs.
  26  */
  27 #define KVMPPC_XICS_FIRST_IRQ   16
  28 #define KVMPPC_XICS_NR_IRQS     ((KVMPPC_XICS_MAX_ICS_ID + 1) * \
  29                                  KVMPPC_XICS_IRQ_PER_ICS)
  30
  31 /* Priority value to use for disabling an interrupt */
  32 #define MASKED  0xff
  33
  34 /* State for one irq source */
  35 struct ics_irq_state {
  36         u32 number;
  37         u32 server;
  38         u8  priority;
  39         u8  saved_priority;
  40         u8  resend;
  41         u8  masked_pending;
  42         u8  asserted; /* Only for LSI */
  43         u8  exists;
  44 };
  45
  46 /* Atomic ICP state, updated with a single compare & swap */
  47 union kvmppc_icp_state {
  48         unsigned long raw;
  49         struct {
  50                 u8 out_ee:1;
  51                 u8 need_resend:1;
  52                 u8 cppr;
  53                 u8 mfrr;
  54                 u8 pending_pri;
  55                 u32 xisr;
  56         };
  57 };
  58
  59 /* One bit per ICS */
  60 #define ICP_RESEND_MAP_SIZE     (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
  61
  62 struct kvmppc_icp {
  63         struct kvm_vcpu *vcpu;
  64         unsigned long server_num;
  65         union kvmppc_icp_state state;
  66         unsigned long resend_map[ICP_RESEND_MAP_SIZE];
  67
  68         /* Real mode might find something too hard, here's the action
  69          * it might request from virtual mode
  70          */
  71 #define XICS_RM_KICK_VCPU       0x1
  72 #define XICS_RM_CHECK_RESEND    0x2
  73 #define XICS_RM_REJECT          0x4
  74 #define XICS_RM_NOTIFY_EOI      0x8
  75         u32 rm_action;
  76         struct kvm_vcpu *rm_kick_target;
  77         struct kvmppc_icp *rm_resend_icp;
  78         u32  rm_reject;
  79         u32  rm_eoied_irq;
  80
  81         /* Counters for each reason we exited real mode */
  82         unsigned long n_rm_kick_vcpu;
  83         unsigned long n_rm_check_resend;
  84         unsigned long n_rm_reject;
  85         unsigned long n_rm_notify_eoi;
  86         /* Counters for handling ICP processing in real mode */
  87         unsigned long n_check_resend;
  88         unsigned long n_reject;
  89
  90         /* Debug stuff for real mode */
  91         union kvmppc_icp_state rm_dbgstate;
  92         struct kvm_vcpu *rm_dbgtgt;
  93 };
  94
  95 struct kvmppc_ics {
  96         arch_spinlock_t lock;
  97         u16 icsid;
  98         struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
  99 };
 100
 101 struct kvmppc_xics {
 102         struct kvm *kvm;
 103         struct kvm_device *dev;
 104         struct dentry *dentry;
 105         u32 max_icsid;
 106         bool real_mode;
 107         bool real_mode_dbg;
 108         u32 err_noics;
 109         u32 err_noicp;
 110         struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
 111 };
 112
 113 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
 114                                                          u32 nr)
 115 {
 116         struct kvm_vcpu *vcpu = NULL;
 117         int i;
 118
 119         kvm_for_each_vcpu(i, vcpu, kvm) {
 120                 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
 121                         return vcpu->arch.icp;
 122         }
 123         return NULL;
 124 }
 125
 126 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
 127                                                       u32 irq, u16 *source)
 128 {
 129         u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
 130         u16 src = irq & KVMPPC_XICS_SRC_MASK;
 131         struct kvmppc_ics *ics;
 132
 133         if (source)
 134                 *source = src;
 135         if (icsid > KVMPPC_XICS_MAX_ICS_ID)
 136                 return NULL;
 137         ics = xics->ics[icsid];
 138         if (!ics)
 139                 return NULL;
 140         return ics;
 141 }
 142
 143
 144 #endif /* _KVM_PPC_BOOK3S_XICS_H */