drivers/kvm/ioapic.c

   1 /*
   2  *  Copyright (C) 2001  MandrakeSoft S.A.
   3  *
   4  *    MandrakeSoft S.A.
   5  *    43, rue d'Aboukir
   6  *    75002 Paris - France
   7  *    http://www.linux-mandrake.com/
   8  *    http://www.mandrakesoft.com/
   9  *
  10  *  This library is free software; you can redistribute it and/or
  11  *  modify it under the terms of the GNU Lesser General Public
  12  *  License as published by the Free Software Foundation; either
  13  *  version 2 of the License, or (at your option) any later version.
  14  *
  15  *  This library is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  Lesser General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU Lesser General Public
  21  *  License along with this library; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  *  Yunhong Jiang <yunhong.jiang@intel.com>
  25  *  Yaozu (Eddie) Dong <eddie.dong@intel.com>
  26  *  Based on Xen 3.1 code.
  27  */
  28
  29 #include "kvm.h"
  30 #include <linux/kvm.h>
  31 #include <linux/mm.h>
  32 #include <linux/highmem.h>
  33 #include <linux/smp.h>
  34 #include <linux/hrtimer.h>
  35 #include <linux/io.h>
  36 #include <asm/processor.h>
  37 #include <asm/msr.h>
  38 #include <asm/page.h>
  39 #include <asm/current.h>
  40 #include <asm/apicdef.h>
  41 #include <asm/io_apic.h>
  42 #include "irq.h"
  43 /* #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  44 #define ioapic_debug(fmt, arg...)
  45 static void ioapic_deliver(struct kvm_ioapic *vioapic, int irq);
  46
  47 static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
  48                                           unsigned long addr,
  49                                           unsigned long length)
  50 {
  51         unsigned long result = 0;
  52
  53         switch (ioapic->ioregsel) {
  54         case IOAPIC_REG_VERSION:
  55                 result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
  56                           | (IOAPIC_VERSION_ID & 0xff));
  57                 break;
  58
  59         case IOAPIC_REG_APIC_ID:
  60         case IOAPIC_REG_ARB_ID:
  61                 result = ((ioapic->id & 0xf) << 24);
  62                 break;
  63
  64         default:
  65                 {
  66                         u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
  67                         u64 redir_content;
  68
  69                         ASSERT(redir_index < IOAPIC_NUM_PINS);
  70
  71                         redir_content = ioapic->redirtbl[redir_index].bits;
  72                         result = (ioapic->ioregsel & 0x1) ?
  73                             (redir_content >> 32) & 0xffffffff :
  74                             redir_content & 0xffffffff;
  75                         break;
  76                 }
  77         }
  78
  79         return result;
  80 }
  81
  82 static void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
  83 {
  84         union ioapic_redir_entry *pent;
  85
  86         pent = &ioapic->redirtbl[idx];
  87
  88         if (!pent->fields.mask) {
  89                 ioapic_deliver(ioapic, idx);
  90                 if (pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
  91                         pent->fields.remote_irr = 1;
  92         }
  93         if (!pent->fields.trig_mode)
  94                 ioapic->irr &= ~(1 << idx);
  95 }
  96
  97 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
  98 {
  99         unsigned index;
 100
 101         switch (ioapic->ioregsel) {
 102         case IOAPIC_REG_VERSION:
 103                 /* Writes are ignored. */
 104                 break;
 105
 106         case IOAPIC_REG_APIC_ID:
 107                 ioapic->id = (val >> 24) & 0xf;
 108                 break;
 109
 110         case IOAPIC_REG_ARB_ID:
 111                 break;
 112
 113         default:
 114                 index = (ioapic->ioregsel - 0x10) >> 1;
 115
 116                 ioapic_debug("change redir index %x val %x", index, val);
 117                 if (index >= IOAPIC_NUM_PINS)
 118                         return;
 119                 if (ioapic->ioregsel & 1) {
 120                         ioapic->redirtbl[index].bits &= 0xffffffff;
 121                         ioapic->redirtbl[index].bits |= (u64) val << 32;
 122                 } else {
 123                         ioapic->redirtbl[index].bits &= ~0xffffffffULL;
 124                         ioapic->redirtbl[index].bits |= (u32) val;
 125                         ioapic->redirtbl[index].fields.remote_irr = 0;
 126                 }
 127                 if (ioapic->irr & (1 << index))
 128                         ioapic_service(ioapic, index);
 129                 break;
 130         }
 131 }
 132
 133 static void ioapic_inj_irq(struct kvm_ioapic *ioapic,
 134                            struct kvm_lapic *target,
 135                            u8 vector, u8 trig_mode, u8 delivery_mode)
 136 {
 137         ioapic_debug("irq %d trig %d deliv %d", vector, trig_mode,
 138                      delivery_mode);
 139
 140         ASSERT((delivery_mode == dest_Fixed) ||
 141                (delivery_mode == dest_LowestPrio));
 142
 143         kvm_apic_set_irq(target, vector, trig_mode);
 144 }
 145
 146 static u32 ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
 147                                        u8 dest_mode)
 148 {
 149         u32 mask = 0;
 150         int i;
 151         struct kvm *kvm = ioapic->kvm;
 152         struct kvm_vcpu *vcpu;
 153
 154         ioapic_debug("dest %d dest_mode %d", dest, dest_mode);
 155
 156         if (dest_mode == 0) {   /* Physical mode. */
 157                 if (dest == 0xFF) {     /* Broadcast. */
 158                         for (i = 0; i < KVM_MAX_VCPUS; ++i)
 159                                 if (kvm->vcpus[i] && kvm->vcpus[i]->apic)
 160                                         mask |= 1 << i;
 161                         return mask;
 162                 }
 163                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 164                         vcpu = kvm->vcpus[i];
 165                         if (!vcpu)
 166                                 continue;
 167                         if (kvm_apic_match_physical_addr(vcpu->apic, dest)) {
 168                                 if (vcpu->apic)
 169                                         mask = 1 << i;
 170                                 break;
 171                         }
 172                 }
 173         } else if (dest != 0)   /* Logical mode, MDA non-zero. */
 174                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 175                         vcpu = kvm->vcpus[i];
 176                         if (!vcpu)
 177                                 continue;
 178                         if (vcpu->apic &&
 179                             kvm_apic_match_logical_addr(vcpu->apic, dest))
 180                                 mask |= 1 << vcpu->vcpu_id;
 181                 }
 182         ioapic_debug("mask %x", mask);
 183         return mask;
 184 }
 185
 186 static void ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 187 {
 188         u8 dest = ioapic->redirtbl[irq].fields.dest_id;
 189         u8 dest_mode = ioapic->redirtbl[irq].fields.dest_mode;
 190         u8 delivery_mode = ioapic->redirtbl[irq].fields.delivery_mode;
 191         u8 vector = ioapic->redirtbl[irq].fields.vector;
 192         u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
 193         u32 deliver_bitmask;
 194         struct kvm_lapic *target;
 195         struct kvm_vcpu *vcpu;
 196         int vcpu_id;
 197
 198         ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
 199                      "vector=%x trig_mode=%x",
 200                      dest, dest_mode, delivery_mode, vector, trig_mode);
 201
 202         deliver_bitmask = ioapic_get_delivery_bitmask(ioapic, dest, dest_mode);
 203         if (!deliver_bitmask) {
 204                 ioapic_debug("no target on destination");
 205                 return;
 206         }
 207
 208         switch (delivery_mode) {
 209         case dest_LowestPrio:
 210                 target =
 211                     kvm_apic_round_robin(ioapic->kvm, vector, deliver_bitmask);
 212                 if (target != NULL)
 213                         ioapic_inj_irq(ioapic, target, vector,
 214                                        trig_mode, delivery_mode);
 215                 else
 216                         ioapic_debug("null round robin: "
 217                                      "mask=%x vector=%x delivery_mode=%x",
 218                                      deliver_bitmask, vector, dest_LowestPrio);
 219                 break;
 220         case dest_Fixed:
 221                 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
 222                         if (!(deliver_bitmask & (1 << vcpu_id)))
 223                                 continue;
 224                         deliver_bitmask &= ~(1 << vcpu_id);
 225                         vcpu = ioapic->kvm->vcpus[vcpu_id];
 226                         if (vcpu) {
 227                                 target = vcpu->apic;
 228                                 ioapic_inj_irq(ioapic, target, vector,
 229                                                trig_mode, delivery_mode);
 230                         }
 231                 }
 232                 break;
 233
 234                 /* TODO: NMI */
 235         default:
 236                 printk(KERN_WARNING "Unsupported delivery mode %d\n",
 237                        delivery_mode);
 238                 break;
 239         }
 240 }
 241
 242 void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
 243 {
 244         u32 old_irr = ioapic->irr;
 245         u32 mask = 1 << irq;
 246         union ioapic_redir_entry entry;
 247
 248         if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
 249                 entry = ioapic->redirtbl[irq];
 250                 level ^= entry.fields.polarity;
 251                 if (!level)
 252                         ioapic->irr &= ~mask;
 253                 else {
 254                         ioapic->irr |= mask;
 255                         if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
 256                             || !entry.fields.remote_irr)
 257                                 ioapic_service(ioapic, irq);
 258                 }
 259         }
 260 }
 261
 262 static int get_eoi_gsi(struct kvm_ioapic *ioapic, int vector)
 263 {
 264         int i;
 265
 266         for (i = 0; i < IOAPIC_NUM_PINS; i++)
 267                 if (ioapic->redirtbl[i].fields.vector == vector)
 268                         return i;
 269         return -1;
 270 }
 271
 272 void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
 273 {
 274         struct kvm_ioapic *ioapic = kvm->vioapic;
 275         union ioapic_redir_entry *ent;
 276         int gsi;
 277
 278         gsi = get_eoi_gsi(ioapic, vector);
 279         if (gsi == -1) {
 280                 printk(KERN_WARNING "Can't find redir item for %d EOI\n",
 281                        vector);
 282                 return;
 283         }
 284
 285         ent = &ioapic->redirtbl[gsi];
 286         ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
 287
 288         ent->fields.remote_irr = 0;
 289         if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
 290                 ioapic_deliver(ioapic, gsi);
 291 }
 292
 293 static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr)
 294 {
 295         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 296
 297         return ((addr >= ioapic->base_address &&
 298                  (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
 299 }
 300
 301 static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
 302                              void *val)
 303 {
 304         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 305         u32 result;
 306
 307         ioapic_debug("addr %lx", (unsigned long)addr);
 308         ASSERT(!(addr & 0xf));  /* check alignment */
 309
 310         addr &= 0xff;
 311         switch (addr) {
 312         case IOAPIC_REG_SELECT:
 313                 result = ioapic->ioregsel;
 314                 break;
 315
 316         case IOAPIC_REG_WINDOW:
 317                 result = ioapic_read_indirect(ioapic, addr, len);
 318                 break;
 319
 320         default:
 321                 result = 0;
 322                 break;
 323         }
 324         switch (len) {
 325         case 8:
 326                 *(u64 *) val = result;
 327                 break;
 328         case 1:
 329         case 2:
 330         case 4:
 331                 memcpy(val, (char *)&result, len);
 332                 break;
 333         default:
 334                 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
 335         }
 336 }
 337
 338 static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
 339                               const void *val)
 340 {
 341         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 342         u32 data;
 343
 344         ioapic_debug("ioapic_mmio_write addr=%lx len=%d val=%p\n",
 345                      addr, len, val);
 346         ASSERT(!(addr & 0xf));  /* check alignment */
 347         if (len == 4 || len == 8)
 348                 data = *(u32 *) val;
 349         else {
 350                 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
 351                 return;
 352         }
 353
 354         addr &= 0xff;
 355         switch (addr) {
 356         case IOAPIC_REG_SELECT:
 357                 ioapic->ioregsel = data;
 358                 break;
 359
 360         case IOAPIC_REG_WINDOW:
 361                 ioapic_write_indirect(ioapic, data);
 362                 break;
 363
 364         default:
 365                 break;
 366         }
 367 }
 368
 369 int kvm_ioapic_init(struct kvm *kvm)
 370 {
 371         struct kvm_ioapic *ioapic;
 372         int i;
 373
 374         ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
 375         if (!ioapic)
 376                 return -ENOMEM;
 377         kvm->vioapic = ioapic;
 378         for (i = 0; i < IOAPIC_NUM_PINS; i++)
 379                 ioapic->redirtbl[i].fields.mask = 1;
 380         ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
 381         ioapic->dev.read = ioapic_mmio_read;
 382         ioapic->dev.write = ioapic_mmio_write;
 383         ioapic->dev.in_range = ioapic_in_range;
 384         ioapic->dev.private = ioapic;
 385         ioapic->kvm = kvm;
 386         kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
 387         return 0;
 388 }