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  lsi;                /* level-sensitive interrupt */
  43         u8  asserted; /* Only for LSI */
  44         u8  exists;
  45 };
  46
  47 /* Atomic ICP state, updated with a single compare & swap */
  48 union kvmppc_icp_state {
  49         unsigned long raw;
  50         struct {
  51                 u8 out_ee:1;
  52                 u8 need_resend:1;
  53                 u8 cppr;
  54                 u8 mfrr;
  55                 u8 pending_pri;
  56                 u32 xisr;
  57         };
  58 };
  59
  60 /* One bit per ICS */
  61 #define ICP_RESEND_MAP_SIZE     (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
  62
  63 struct kvmppc_icp {
  64         struct kvm_vcpu *vcpu;
  65         unsigned long server_num;
  66         union kvmppc_icp_state state;
  67         unsigned long resend_map[ICP_RESEND_MAP_SIZE];
  68
  69         /* Real mode might find something too hard, here's the action
  70          * it might request from virtual mode
  71          */
  72 #define XICS_RM_KICK_VCPU       0x1
  73 #define XICS_RM_CHECK_RESEND    0x2
  74 #define XICS_RM_REJECT          0x4
  75 #define XICS_RM_NOTIFY_EOI      0x8
  76         u32 rm_action;
  77         struct kvm_vcpu *rm_kick_target;
  78         struct kvmppc_icp *rm_resend_icp;
  79         u32  rm_reject;
  80         u32  rm_eoied_irq;
  81
  82         /* Counters for each reason we exited real mode */
  83         unsigned long n_rm_kick_vcpu;
  84         unsigned long n_rm_check_resend;
  85         unsigned long n_rm_reject;
  86         unsigned long n_rm_notify_eoi;
  87         /* Counters for handling ICP processing in real mode */
  88         unsigned long n_check_resend;
  89         unsigned long n_reject;
  90
  91         /* Debug stuff for real mode */
  92         union kvmppc_icp_state rm_dbgstate;
  93         struct kvm_vcpu *rm_dbgtgt;
  94 };
  95
  96 struct kvmppc_ics {
  97         arch_spinlock_t lock;
  98         u16 icsid;
  99         struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
 100 };
 101
 102 struct kvmppc_xics {
 103         struct kvm *kvm;
 104         struct kvm_device *dev;
 105         struct dentry *dentry;
 106         u32 max_icsid;
 107         bool real_mode;
 108         bool real_mode_dbg;
 109         u32 err_noics;
 110         u32 err_noicp;
 111         struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
 112 };
 113
 114 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
 115                                                          u32 nr)
 116 {
 117         struct kvm_vcpu *vcpu = NULL;
 118         int i;
 119
 120         kvm_for_each_vcpu(i, vcpu, kvm) {
 121                 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
 122                         return vcpu->arch.icp;
 123         }
 124         return NULL;
 125 }
 126
 127 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
 128                                                       u32 irq, u16 *source)
 129 {
 130         u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
 131         u16 src = irq & KVMPPC_XICS_SRC_MASK;
 132         struct kvmppc_ics *ics;
 133
 134         if (source)
 135                 *source = src;
 136         if (icsid > KVMPPC_XICS_MAX_ICS_ID)
 137                 return NULL;
 138         ics = xics->ics[icsid];
 139         if (!ics)
 140                 return NULL;
 141         return ics;
 142 }
 143
 144
 145 #endif /* _KVM_PPC_BOOK3S_XICS_H */