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         int intr_cpu;
  46         u32 host_irq;
  47 };
  48
  49 /* Atomic ICP state, updated with a single compare & swap */
  50 union kvmppc_icp_state {
  51         unsigned long raw;
  52         struct {
  53                 u8 out_ee:1;
  54                 u8 need_resend:1;
  55                 u8 cppr;
  56                 u8 mfrr;
  57                 u8 pending_pri;
  58                 u32 xisr;
  59         };
  60 };
  61
  62 /* One bit per ICS */
  63 #define ICP_RESEND_MAP_SIZE     (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
  64
  65 struct kvmppc_icp {
  66         struct kvm_vcpu *vcpu;
  67         unsigned long server_num;
  68         union kvmppc_icp_state state;
  69         unsigned long resend_map[ICP_RESEND_MAP_SIZE];
  70
  71         /* Real mode might find something too hard, here's the action
  72          * it might request from virtual mode
  73          */
  74 #define XICS_RM_KICK_VCPU       0x1
  75 #define XICS_RM_CHECK_RESEND    0x2
  76 #define XICS_RM_REJECT          0x4
  77 #define XICS_RM_NOTIFY_EOI      0x8
  78         u32 rm_action;
  79         struct kvm_vcpu *rm_kick_target;
  80         struct kvmppc_icp *rm_resend_icp;
  81         u32  rm_reject;
  82         u32  rm_eoied_irq;
  83
  84         /* Counters for each reason we exited real mode */
  85         unsigned long n_rm_kick_vcpu;
  86         unsigned long n_rm_check_resend;
  87         unsigned long n_rm_reject;
  88         unsigned long n_rm_notify_eoi;
  89         /* Counters for handling ICP processing in real mode */
  90         unsigned long n_check_resend;
  91         unsigned long n_reject;
  92
  93         /* Debug stuff for real mode */
  94         union kvmppc_icp_state rm_dbgstate;
  95         struct kvm_vcpu *rm_dbgtgt;
  96 };
  97
  98 struct kvmppc_ics {
  99         arch_spinlock_t lock;
 100         u16 icsid;
 101         struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
 102 };
 103
 104 struct kvmppc_xics {
 105         struct kvm *kvm;
 106         struct kvm_device *dev;
 107         struct dentry *dentry;
 108         u32 max_icsid;
 109         bool real_mode;
 110         bool real_mode_dbg;
 111         u32 err_noics;
 112         u32 err_noicp;
 113         struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
 114 };
 115
 116 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
 117                                                          u32 nr)
 118 {
 119         struct kvm_vcpu *vcpu = NULL;
 120         int i;
 121
 122         kvm_for_each_vcpu(i, vcpu, kvm) {
 123                 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
 124                         return vcpu->arch.icp;
 125         }
 126         return NULL;
 127 }
 128
 129 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
 130                                                       u32 irq, u16 *source)
 131 {
 132         u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
 133         u16 src = irq & KVMPPC_XICS_SRC_MASK;
 134         struct kvmppc_ics *ics;
 135
 136         if (source)
 137                 *source = src;
 138         if (icsid > KVMPPC_XICS_MAX_ICS_ID)
 139                 return NULL;
 140         ics = xics->ics[icsid];
 141         if (!ics)
 142                 return NULL;
 143         return ics;
 144 }
 145
 146
 147 #endif /* _KVM_PPC_BOOK3S_XICS_H */