include/kvm/arm_vgic.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   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  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  */
  18
  19 #ifndef __ASM_ARM_KVM_VGIC_H
  20 #define __ASM_ARM_KVM_VGIC_H
  21
  22 #include <linux/kernel.h>
  23 #include <linux/kvm.h>
  24 #include <linux/irqreturn.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/types.h>
  27 #include <linux/irqchip/arm-gic.h>
  28
  29 #define VGIC_NR_IRQS            256
  30 #define VGIC_NR_SGIS            16
  31 #define VGIC_NR_PPIS            16
  32 #define VGIC_NR_PRIVATE_IRQS    (VGIC_NR_SGIS + VGIC_NR_PPIS)
  33 #define VGIC_NR_SHARED_IRQS     (VGIC_NR_IRQS - VGIC_NR_PRIVATE_IRQS)
  34 #define VGIC_MAX_CPUS           KVM_MAX_VCPUS
  35 #define VGIC_MAX_LRS            (1 << 6)
  36
  37 /* Sanity checks... */
  38 #if (VGIC_MAX_CPUS > 8)
  39 #error  Invalid number of CPU interfaces
  40 #endif
  41
  42 #if (VGIC_NR_IRQS & 31)
  43 #error "VGIC_NR_IRQS must be a multiple of 32"
  44 #endif
  45
  46 #if (VGIC_NR_IRQS > 1024)
  47 #error "VGIC_NR_IRQS must be <= 1024"
  48 #endif
  49
  50 /*
  51  * The GIC distributor registers describing interrupts have two parts:
  52  * - 32 per-CPU interrupts (SGI + PPI)
  53  * - a bunch of shared interrupts (SPI)
  54  */
  55 struct vgic_bitmap {
  56         union {
  57                 u32 reg[VGIC_NR_PRIVATE_IRQS / 32];
  58                 DECLARE_BITMAP(reg_ul, VGIC_NR_PRIVATE_IRQS);
  59         } percpu[VGIC_MAX_CPUS];
  60         union {
  61                 u32 reg[VGIC_NR_SHARED_IRQS / 32];
  62                 DECLARE_BITMAP(reg_ul, VGIC_NR_SHARED_IRQS);
  63         } shared;
  64 };
  65
  66 struct vgic_bytemap {
  67         u32 percpu[VGIC_MAX_CPUS][VGIC_NR_PRIVATE_IRQS / 4];
  68         u32 shared[VGIC_NR_SHARED_IRQS  / 4];
  69 };
  70
  71 struct vgic_dist {
  72 #ifdef CONFIG_KVM_ARM_VGIC
  73         spinlock_t              lock;
  74         bool                    ready;
  75
  76         /* Virtual control interface mapping */
  77         void __iomem            *vctrl_base;
  78
  79         /* Distributor and vcpu interface mapping in the guest */
  80         phys_addr_t             vgic_dist_base;
  81         phys_addr_t             vgic_cpu_base;
  82
  83         /* Distributor enabled */
  84         u32                     enabled;
  85
  86         /* Interrupt enabled (one bit per IRQ) */
  87         struct vgic_bitmap      irq_enabled;
  88
  89         /* Interrupt 'pin' level */
  90         struct vgic_bitmap      irq_state;
  91
  92         /* Level-triggered interrupt in progress */
  93         struct vgic_bitmap      irq_active;
  94
  95         /* Interrupt priority. Not used yet. */
  96         struct vgic_bytemap     irq_priority;
  97
  98         /* Level/edge triggered */
  99         struct vgic_bitmap      irq_cfg;
 100
 101         /* Source CPU per SGI and target CPU */
 102         u8                      irq_sgi_sources[VGIC_MAX_CPUS][VGIC_NR_SGIS];
 103
 104         /* Target CPU for each IRQ */
 105         u8                      irq_spi_cpu[VGIC_NR_SHARED_IRQS];
 106         struct vgic_bitmap      irq_spi_target[VGIC_MAX_CPUS];
 107
 108         /* Bitmap indicating which CPU has something pending */
 109         unsigned long           irq_pending_on_cpu;
 110 #endif
 111 };
 112
 113 struct vgic_cpu {
 114 #ifdef CONFIG_KVM_ARM_VGIC
 115         /* per IRQ to LR mapping */
 116         u8              vgic_irq_lr_map[VGIC_NR_IRQS];
 117
 118         /* Pending interrupts on this VCPU */
 119         DECLARE_BITMAP( pending_percpu, VGIC_NR_PRIVATE_IRQS);
 120         DECLARE_BITMAP( pending_shared, VGIC_NR_SHARED_IRQS);
 121
 122         /* Bitmap of used/free list registers */
 123         DECLARE_BITMAP( lr_used, VGIC_MAX_LRS);
 124
 125         /* Number of list registers on this CPU */
 126         int             nr_lr;
 127
 128         /* CPU vif control registers for world switch */
 129         u32             vgic_hcr;
 130         u32             vgic_vmcr;
 131         u32             vgic_misr;      /* Saved only */
 132         u32             vgic_eisr[2];   /* Saved only */
 133         u32             vgic_elrsr[2];  /* Saved only */
 134         u32             vgic_apr;
 135         u32             vgic_lr[VGIC_MAX_LRS];
 136 #endif
 137 };
 138
 139 #define LR_EMPTY        0xff
 140
 141 struct kvm;
 142 struct kvm_vcpu;
 143 struct kvm_run;
 144 struct kvm_exit_mmio;
 145
 146 #ifdef CONFIG_KVM_ARM_VGIC
 147 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
 148 int kvm_vgic_hyp_init(void);
 149 int kvm_vgic_init(struct kvm *kvm);
 150 int kvm_vgic_create(struct kvm *kvm);
 151 int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu);
 152 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
 153 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
 154 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
 155                         bool level);
 156 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
 157 bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
 158                       struct kvm_exit_mmio *mmio);
 159
 160 #define irqchip_in_kernel(k)    (!!((k)->arch.vgic.vctrl_base))
 161 #define vgic_initialized(k)     ((k)->arch.vgic.ready)
 162
 163 #else
 164 static inline int kvm_vgic_hyp_init(void)
 165 {
 166         return 0;
 167 }
 168
 169 static inline int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
 170 {
 171         return 0;
 172 }
 173
 174 static inline int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
 175 {
 176         return -ENXIO;
 177 }
 178
 179 static inline int kvm_vgic_init(struct kvm *kvm)
 180 {
 181         return 0;
 182 }
 183
 184 static inline int kvm_vgic_create(struct kvm *kvm)
 185 {
 186         return 0;
 187 }
 188
 189 static inline int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
 190 {
 191         return 0;
 192 }
 193
 194 static inline void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) {}
 195 static inline void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) {}
 196
 197 static inline int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid,
 198                                       unsigned int irq_num, bool level)
 199 {
 200         return 0;
 201 }
 202
 203 static inline int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
 204 {
 205         return 0;
 206 }
 207
 208 static inline bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
 209                                     struct kvm_exit_mmio *mmio)
 210 {
 211         return false;
 212 }
 213
 214 static inline int irqchip_in_kernel(struct kvm *kvm)
 215 {
 216         return 0;
 217 }
 218
 219 static inline bool vgic_initialized(struct kvm *kvm)
 220 {
 221         return true;
 222 }
 223 #endif
 224
 225 #endif