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 void v3_init_interrupt_state(struct guest_info * info) {
  46
  47     info->intr_state.irq_pending = 0;
  48     info->intr_state.irq_started = 0;
  49     info->intr_state.irq_vector = 0;
  50
  51     INIT_LIST_HEAD(&(info->intr_state.controller_list));
  52
  53     v3_lock_init(&(info->intr_state.irq_lock));
  54
  55     memset((uchar_t *)(info->intr_state.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  56 }
  57
  58 void v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  59     struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
  60
  61     ctrlr->priv_data = state;
  62     ctrlr->ctrl_ops = ops;
  63
  64     list_add(&(ctrlr->ctrl_node), &(info->intr_state.controller_list));
  65
  66 }
  67
  68
  69
  70
  71 static inline struct v3_irq_hook * get_irq_hook(struct guest_info * info, uint_t irq) {
  72     V3_ASSERT(irq <= 256);
  73     return info->intr_state.hooks[irq];
  74 }
  75
  76
  77 int v3_hook_irq(struct guest_info * info,
  78                 uint_t irq,
  79                 int (*handler)(struct guest_info * info, struct v3_interrupt * intr, void * priv_data),
  80                 void  * priv_data)
  81 {
  82     struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
  83
  84     if (hook == NULL) {
  85         return -1;
  86     }
  87
  88     if (get_irq_hook(info, irq) != NULL) {
  89         PrintError("IRQ %d already hooked\n", irq);
  90         return -1;
  91     }
  92
  93     hook->handler = handler;
  94     hook->priv_data = priv_data;
  95
  96     info->intr_state.hooks[irq] = hook;
  97
  98     if (V3_Hook_Interrupt(info, irq)) {
  99         PrintError("hook_irq: failed to hook irq %d\n", irq);
 100         return -1;
 101     } else {
 102         PrintDebug("hook_irq: hooked irq %d\n", irq);
 103         return 0;
 104     }
 105 }
 106
 107
 108
 109 static int passthrough_irq_handler(struct guest_info * info, struct v3_interrupt * intr, void * priv_data) {
 110     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 111                intr->irq, (void *)info);
 112
 113     return v3_raise_irq(info, intr->irq);
 114 }
 115
 116 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq) {
 117     int rc = v3_hook_irq(info, irq, passthrough_irq_handler, NULL);
 118
 119     if (rc) {
 120         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 121         return -1;
 122     } else {
 123         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 124         return 0;
 125     }
 126 }
 127
 128
 129
 130
 131
 132 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 133     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 134
 135     struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 136
 137     if (hook == NULL) {
 138         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 139         return -1;
 140     }
 141
 142     return hook->handler(info, intr, hook->priv_data);
 143 }
 144
 145
 146
 147
 148
 149 int v3_raise_virq(struct guest_info * info, int irq) {
 150     struct v3_intr_state * intr_state = &(info->intr_state);
 151     int major = irq / 8;
 152     int minor = irq % 8;
 153
 154     intr_state->virq_map[major] |= (1 << minor);
 155
 156     return 0;
 157 }
 158
 159 int v3_lower_virq(struct guest_info * info, int irq) {
 160     struct v3_intr_state * intr_state = &(info->intr_state);
 161     int major = irq / 8;
 162     int minor = irq % 8;
 163
 164     intr_state->virq_map[major] &= ~(1 << minor);
 165
 166     return 0;
 167 }
 168
 169
 170 int v3_lower_irq(struct guest_info * info, int irq) {
 171     struct intr_controller * ctrl = NULL;
 172     struct v3_intr_state * intr_state = &(info->intr_state);
 173
 174     //    PrintDebug("[v3_lower_irq]\n");
 175     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 176
 177     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 178         ctrl->ctrl_ops->lower_intr(info, ctrl->priv_data, irq);
 179     }
 180
 181     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 182
 183     return 0;
 184 }
 185
 186 int v3_raise_irq(struct guest_info * info, int irq) {
 187     struct intr_controller * ctrl = NULL;
 188     struct v3_intr_state * intr_state = &(info->intr_state);
 189
 190     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 191     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 192
 193     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 194         ctrl->ctrl_ops->raise_intr(info, ctrl->priv_data, irq);
 195     }
 196
 197     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 198
 199     return 0;
 200 }
 201
 202
 203
 204 v3_intr_type_t v3_intr_pending(struct guest_info * info) {
 205     struct v3_intr_state * intr_state = &(info->intr_state);
 206     struct intr_controller * ctrl = NULL;
 207     int ret = V3_INVALID_INTR;
 208     int i = 0;
 209
 210     //  PrintDebug("[intr_pending]\n");
 211     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 212
 213     // VIRQs have priority
 214     for (i = 0; i < MAX_IRQ / 8; i++) {
 215         if (intr_state->virq_map[i] != 0) {
 216             ret = V3_VIRTUAL_IRQ;
 217             break;
 218         }
 219     }
 220
 221     if (ret == V3_INVALID_INTR) {
 222         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 223             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data) == 1) {
 224                 ret = V3_EXTERNAL_IRQ;
 225                 break;
 226             }
 227         }
 228     }
 229
 230     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 231
 232     return ret;
 233 }
 234
 235
 236 uint32_t v3_get_intr(struct guest_info * info) {
 237     struct v3_intr_state * intr_state = &(info->intr_state);
 238     struct intr_controller * ctrl = NULL;
 239     uint_t ret = 0;
 240     int i = 0;
 241     int j = 0;
 242
 243     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 244
 245     // virqs have priority
 246     for (i = 0; i < MAX_IRQ / 8; i++) {
 247         if (intr_state->virq_map[i] != 0) {
 248             for (j = 0; j < 8; j++) {
 249                 if (intr_state->virq_map[i] & (1 << j)) {
 250                     ret = (i * 8) + j;
 251                     break;
 252                 }
 253             }
 254             break;
 255         }
 256     }
 257
 258     if (!ret) {
 259         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 260             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data)) {
 261                 uint_t intr_num = ctrl->ctrl_ops->get_intr_number(info, ctrl->priv_data);
 262
 263                 //      PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 264                 ret = intr_num;
 265                 break;
 266             }
 267         }
 268     }
 269
 270     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 271
 272     return ret;
 273 }
 274
 275 /*
 276 intr_type_t v3_get_intr_type(struct guest_info * info) {
 277     struct v3_intr_state * intr_state = &(info->intr_state);
 278     struct intr_controller * ctrl = NULL;
 279     intr_type_t type = V3_INVALID_INTR;
 280
 281     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 282
 283     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 284         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 285             //PrintDebug("[get_intr_type] External_irq\n");
 286             type = V3_EXTERNAL_IRQ;
 287             break;
 288         }
 289     }
 290
 291 #ifdef CONFIG_DEBUG_INTERRUPTS
 292     if (type == V3_INVALID_INTR) {
 293         PrintError("[get_intr_type] Invalid_Intr\n");
 294     }
 295 #endif
 296
 297     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 298
 299     return type;
 300 }
 301 */
 302
 303
 304
 305
 306
 307 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, v3_intr_type_t type) {
 308     struct v3_intr_state * intr_state = &(info->intr_state);
 309
 310     if (type == V3_EXTERNAL_IRQ) {
 311         struct intr_controller * ctrl = NULL;
 312
 313         addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 314
 315         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 316         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 317             ctrl->ctrl_ops->begin_irq(info, ctrl->priv_data, intr_num);
 318         }
 319
 320         v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 321     }
 322
 323     return 0;
 324 }