palacios/src/palacios/vmm_intr.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20
  21 #include <palacios/vmm_intr.h>
  22 #include <palacios/vmm.h>
  23
  24 #include <palacios/vm_guest.h>
  25 #include <palacios/vmm_ctrl_regs.h>
  26
  27 #include <palacios/vmm_lock.h>
  28
  29 #ifndef CONFIG_DEBUG_INTERRUPTS
  30 #undef PrintDebug
  31 #define PrintDebug(fmt, args...)
  32 #endif
  33
  34
  35
  36
  37 struct intr_controller {
  38     struct intr_ctrl_ops * ctrl_ops;
  39
  40     void * priv_data;
  41     struct list_head ctrl_node;
  42 };
  43
  44
  45 struct intr_router {
  46     struct intr_router_ops * router_ops;
  47
  48     void * priv_data;
  49     struct list_head router_node;
  50
  51 };
  52
  53 void v3_init_intr_controllers(struct guest_info * info) {
  54     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
  55
  56     intr_state->irq_pending = 0;
  57     intr_state->irq_started = 0;
  58     intr_state->irq_vector = 0;
  59
  60     INIT_LIST_HEAD(&(intr_state->controller_list));
  61 }
  62
  63 void v3_init_intr_routers(struct v3_vm_info * vm) {
  64
  65     INIT_LIST_HEAD(&(vm->intr_routers.router_list));
  66
  67     v3_lock_init(&(vm->intr_routers.irq_lock));
  68
  69     memset((uchar_t *)(vm->intr_routers.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  70 }
  71
  72
  73 int v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * priv_data) {
  74     struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
  75
  76     ctrlr->priv_data = priv_data;
  77     ctrlr->ctrl_ops = ops;
  78
  79     list_add(&(ctrlr->ctrl_node), &(info->intr_core_state.controller_list));
  80
  81     return 0;
  82 }
  83
  84 int v3_register_intr_router(struct v3_vm_info * vm, struct intr_router_ops * ops, void * priv_data) {
  85     struct intr_router * router = (struct intr_router *)V3_Malloc(sizeof(struct intr_router));
  86
  87     router->priv_data = priv_data;
  88     router->router_ops = ops;
  89
  90     list_add(&(router->router_node), &(vm->intr_routers.router_list));
  91
  92     return 0;
  93 }
  94
  95
  96
  97 static inline struct v3_irq_hook * get_irq_hook(struct v3_vm_info * vm, uint_t irq) {
  98     V3_ASSERT(irq <= 256);
  99     return vm->intr_routers.hooks[irq];
 100 }
 101
 102
 103 int v3_hook_irq(struct v3_vm_info * vm,
 104                 uint_t irq,
 105                 int (*handler)(struct v3_vm_info * vm, struct v3_interrupt * intr, void * priv_data),
 106                 void  * priv_data)
 107 {
 108     struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
 109
 110     if (hook == NULL) {
 111         return -1;
 112     }
 113
 114     if (get_irq_hook(vm, irq) != NULL) {
 115         PrintError("IRQ %d already hooked\n", irq);
 116         return -1;
 117     }
 118
 119     hook->handler = handler;
 120     hook->priv_data = priv_data;
 121
 122     vm->intr_routers.hooks[irq] = hook;
 123
 124     if (V3_Hook_Interrupt(vm, irq)) {
 125         PrintError("hook_irq: failed to hook irq %d\n", irq);
 126         return -1;
 127     } else {
 128         PrintDebug("hook_irq: hooked irq %d\n", irq);
 129         return 0;
 130     }
 131 }
 132
 133
 134
 135 static int passthrough_irq_handler(struct v3_vm_info * vm, struct v3_interrupt * intr, void * priv_data) {
 136     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 137                intr->irq, (void *)vm);
 138
 139     return v3_raise_irq(vm, intr->irq);
 140 }
 141
 142 int v3_hook_passthrough_irq(struct v3_vm_info * vm, uint_t irq) {
 143     int rc = v3_hook_irq(vm, irq, passthrough_irq_handler, NULL);
 144
 145     if (rc) {
 146         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)vm);
 147         return -1;
 148     } else {
 149         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)vm);
 150         return 0;
 151     }
 152 }
 153
 154
 155
 156
 157
 158 int v3_deliver_irq(struct v3_vm_info * vm, struct v3_interrupt * intr) {
 159     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 160
 161     struct v3_irq_hook * hook = get_irq_hook(vm, intr->irq);
 162
 163     if (hook == NULL) {
 164         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 165         return -1;
 166     }
 167
 168     return hook->handler(vm, intr, hook->priv_data);
 169 }
 170
 171
 172
 173
 174
 175 int v3_raise_virq(struct guest_info * info, int irq) {
 176     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 177     int major = irq / 8;
 178     int minor = irq % 8;
 179
 180     intr_state->virq_map[major] |= (1 << minor);
 181
 182     return 0;
 183 }
 184
 185 int v3_lower_virq(struct guest_info * info, int irq) {
 186     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 187     int major = irq / 8;
 188     int minor = irq % 8;
 189
 190     intr_state->virq_map[major] &= ~(1 << minor);
 191
 192     return 0;
 193 }
 194
 195
 196 int v3_lower_irq(struct v3_vm_info * vm, int irq) {
 197     struct intr_router * router = NULL;
 198     struct v3_intr_routers * routers = &(vm->intr_routers);
 199
 200     //    PrintDebug("[v3_lower_irq]\n");
 201     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 202
 203     list_for_each_entry(router, &(routers->router_list), router_node) {
 204         router->router_ops->lower_intr(vm, router->priv_data, irq);
 205     }
 206
 207     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 208
 209     return 0;
 210 }
 211
 212 int v3_raise_irq(struct v3_vm_info * vm, int irq) {
 213     struct intr_router * router = NULL;
 214     struct v3_intr_routers * routers = &(vm->intr_routers);
 215
 216     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 217     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 218
 219     list_for_each_entry(router, &(routers->router_list), router_node) {
 220         router->router_ops->raise_intr(vm, router->priv_data, irq);
 221     }
 222
 223     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 224
 225     return 0;
 226 }
 227
 228
 229
 230 v3_intr_type_t v3_intr_pending(struct guest_info * info) {
 231     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 232     struct intr_controller * ctrl = NULL;
 233     int ret = V3_INVALID_INTR;
 234     int i = 0;
 235
 236     //  PrintDebug("[intr_pending]\n");
 237     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 238
 239     // VIRQs have priority
 240     for (i = 0; i < MAX_IRQ / 8; i++) {
 241         if (intr_state->virq_map[i] != 0) {
 242             ret = V3_VIRTUAL_IRQ;
 243             break;
 244         }
 245     }
 246
 247     if (ret == V3_INVALID_INTR) {
 248         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 249             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data) == 1) {
 250                 ret = V3_EXTERNAL_IRQ;
 251                 break;
 252             }
 253         }
 254     }
 255
 256     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 257
 258     return ret;
 259 }
 260
 261
 262 uint32_t v3_get_intr(struct guest_info * info) {
 263     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 264     struct intr_controller * ctrl = NULL;
 265     uint_t ret = 0;
 266     int i = 0;
 267     int j = 0;
 268
 269     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 270
 271     // virqs have priority
 272     for (i = 0; i < MAX_IRQ / 8; i++) {
 273         if (intr_state->virq_map[i] != 0) {
 274             for (j = 0; j < 8; j++) {
 275                 if (intr_state->virq_map[i] & (1 << j)) {
 276                     ret = (i * 8) + j;
 277                     break;
 278                 }
 279             }
 280             break;
 281         }
 282     }
 283
 284     if (!ret) {
 285         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 286             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data)) {
 287                 uint_t intr_num = ctrl->ctrl_ops->get_intr_number(info, ctrl->priv_data);
 288
 289                 //      PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 290                 ret = intr_num;
 291                 break;
 292             }
 293         }
 294     }
 295
 296     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 297
 298     return ret;
 299 }
 300
 301 /*
 302 intr_type_t v3_get_intr_type(struct guest_info * info) {
 303     struct v3_intr_state * intr_state = &(info->intr_state);
 304     struct intr_controller * ctrl = NULL;
 305     intr_type_t type = V3_INVALID_INTR;
 306
 307     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 308
 309     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 310         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 311             //PrintDebug("[get_intr_type] External_irq\n");
 312             type = V3_EXTERNAL_IRQ;
 313             break;
 314         }
 315     }
 316
 317 #ifdef CONFIG_DEBUG_INTERRUPTS
 318     if (type == V3_INVALID_INTR) {
 319         PrintError("[get_intr_type] Invalid_Intr\n");
 320     }
 321 #endif
 322
 323     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 324
 325     return type;
 326 }
 327 */
 328
 329
 330
 331
 332
 333 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, v3_intr_type_t type) {
 334     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 335
 336     if (type == V3_EXTERNAL_IRQ) {
 337         struct intr_controller * ctrl = NULL;
 338
 339         addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 340
 341         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 342         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 343             ctrl->ctrl_ops->begin_irq(info, ctrl->priv_data, intr_num);
 344         }
 345
 346         v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 347     }
 348
 349     return 0;
 350 }