git.oblomov.eu Git - linux-2.6/blob - virt/kvm/irq_comm.c

   1 /*
   2  * irq_comm.c: Common API for in kernel interrupt controller
   3  * Copyright (c) 2007, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  * Authors:
  18  *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
  19  *
  20  */
  21
  22 #include <linux/kvm_host.h>
  23
  24 #include <asm/msidef.h>
  25
  26 #include "irq.h"
  27
  28 #include "ioapic.h"
  29
  30 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
  31                            struct kvm *kvm, int level)
  32 {
  33 #ifdef CONFIG_X86
  34         return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
  35 #else
  36         return -1;
  37 #endif
  38 }
  39
  40 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
  41                               struct kvm *kvm, int level)
  42 {
  43         return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
  44 }
  45
  46 void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
  47                 int dest_id, int dest_mode, bool low_prio, int short_hand,
  48                 unsigned long *deliver_bitmask)
  49 {
  50         int i;
  51         struct kvm_vcpu *vcpu;
  52
  53         if (dest_mode == 0 && dest_id == 0xff && low_prio)
  54                 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
  55
  56         bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
  57         for (i = 0; i < KVM_MAX_VCPUS; i++) {
  58                 vcpu = kvm->vcpus[i];
  59
  60                 if (!vcpu || !kvm_apic_present(vcpu))
  61                         continue;
  62
  63                 if (!kvm_apic_match_dest(vcpu, src, short_hand, dest_id,
  64                                         dest_mode))
  65                         continue;
  66
  67                 __set_bit(i, deliver_bitmask);
  68         }
  69
  70         if (low_prio) {
  71                 vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
  72                 bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
  73                 if (vcpu)
  74                         __set_bit(vcpu->vcpu_id, deliver_bitmask);
  75         }
  76 }
  77
  78 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
  79                        struct kvm *kvm, int level)
  80 {
  81         union kvm_ioapic_redirect_entry entry;
  82
  83         entry.bits = 0;
  84         entry.fields.dest_id = (e->msi.address_lo &
  85                         MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
  86         entry.fields.vector = (e->msi.data &
  87                         MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
  88         entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
  89                         (unsigned long *)&e->msi.address_lo);
  90         entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
  91                         (unsigned long *)&e->msi.data);
  92         entry.fields.delivery_mode = test_bit(
  93                         MSI_DATA_DELIVERY_MODE_SHIFT,
  94                         (unsigned long *)&e->msi.data);
  95
  96         /* TODO Deal with RH bit of MSI message address */
  97         return ioapic_deliver_entry(kvm, &entry);
  98 }
  99
 100 /* This should be called with the kvm->lock mutex held
 101  * Return value:
 102  *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 103  *  = 0   Interrupt was coalesced (previous irq is still pending)
 104  *  > 0   Number of CPUs interrupt was delivered to
 105  */
 106 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
 107 {
 108         struct kvm_kernel_irq_routing_entry *e;
 109         unsigned long *irq_state, sig_level;
 110         int ret = -1;
 111
 112         if (irq < KVM_IOAPIC_NUM_PINS) {
 113                 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
 114
 115                 /* Logical OR for level trig interrupt */
 116                 if (level)
 117                         set_bit(irq_source_id, irq_state);
 118                 else
 119                         clear_bit(irq_source_id, irq_state);
 120                 sig_level = !!(*irq_state);
 121         } else /* Deal with MSI/MSI-X */
 122                 sig_level = 1;
 123
 124         /* Not possible to detect if the guest uses the PIC or the
 125          * IOAPIC.  So set the bit in both. The guest will ignore
 126          * writes to the unused one.
 127          */
 128         list_for_each_entry(e, &kvm->irq_routing, link)
 129                 if (e->gsi == irq) {
 130                         int r = e->set(e, kvm, sig_level);
 131                         if (r < 0)
 132                                 continue;
 133
 134                         ret = r + ((ret < 0) ? 0 : ret);
 135                 }
 136         return ret;
 137 }
 138
 139 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
 140 {
 141         struct kvm_kernel_irq_routing_entry *e;
 142         struct kvm_irq_ack_notifier *kian;
 143         struct hlist_node *n;
 144         unsigned gsi = pin;
 145
 146         list_for_each_entry(e, &kvm->irq_routing, link)
 147                 if (e->irqchip.irqchip == irqchip &&
 148                     e->irqchip.pin == pin) {
 149                         gsi = e->gsi;
 150                         break;
 151                 }
 152
 153         hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
 154                 if (kian->gsi == gsi)
 155                         kian->irq_acked(kian);
 156 }
 157
 158 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 159                                    struct kvm_irq_ack_notifier *kian)
 160 {
 161         hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
 162 }
 163
 164 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
 165 {
 166         hlist_del_init(&kian->link);
 167 }
 168
 169 /* The caller must hold kvm->lock mutex */
 170 int kvm_request_irq_source_id(struct kvm *kvm)
 171 {
 172         unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
 173         int irq_source_id = find_first_zero_bit(bitmap,
 174                                 sizeof(kvm->arch.irq_sources_bitmap));
 175
 176         if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 177                 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
 178                 return -EFAULT;
 179         }
 180
 181         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 182         set_bit(irq_source_id, bitmap);
 183
 184         return irq_source_id;
 185 }
 186
 187 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 188 {
 189         int i;
 190
 191         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 192
 193         if (irq_source_id < 0 ||
 194             irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 195                 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
 196                 return;
 197         }
 198         for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
 199                 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
 200         clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
 201 }
 202
 203 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 204                                     struct kvm_irq_mask_notifier *kimn)
 205 {
 206         kimn->irq = irq;
 207         hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
 208 }
 209
 210 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 211                                       struct kvm_irq_mask_notifier *kimn)
 212 {
 213         hlist_del(&kimn->link);
 214 }
 215
 216 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
 217 {
 218         struct kvm_irq_mask_notifier *kimn;
 219         struct hlist_node *n;
 220
 221         hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
 222                 if (kimn->irq == irq)
 223                         kimn->func(kimn, mask);
 224 }
 225
 226 static void __kvm_free_irq_routing(struct list_head *irq_routing)
 227 {
 228         struct kvm_kernel_irq_routing_entry *e, *n;
 229
 230         list_for_each_entry_safe(e, n, irq_routing, link)
 231                 kfree(e);
 232 }
 233
 234 void kvm_free_irq_routing(struct kvm *kvm)
 235 {
 236         __kvm_free_irq_routing(&kvm->irq_routing);
 237 }
 238
 239 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
 240                                const struct kvm_irq_routing_entry *ue)
 241 {
 242         int r = -EINVAL;
 243         int delta;
 244
 245         e->gsi = ue->gsi;
 246         switch (ue->type) {
 247         case KVM_IRQ_ROUTING_IRQCHIP:
 248                 delta = 0;
 249                 switch (ue->u.irqchip.irqchip) {
 250                 case KVM_IRQCHIP_PIC_MASTER:
 251                         e->set = kvm_set_pic_irq;
 252                         break;
 253                 case KVM_IRQCHIP_PIC_SLAVE:
 254                         e->set = kvm_set_pic_irq;
 255                         delta = 8;
 256                         break;
 257                 case KVM_IRQCHIP_IOAPIC:
 258                                 e->set = kvm_set_ioapic_irq;
 259                         break;
 260                 default:
 261                         goto out;
 262                 }
 263                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
 264                 e->irqchip.pin = ue->u.irqchip.pin + delta;
 265                 break;
 266         case KVM_IRQ_ROUTING_MSI:
 267                 e->set = kvm_set_msi;
 268                 e->msi.address_lo = ue->u.msi.address_lo;
 269                 e->msi.address_hi = ue->u.msi.address_hi;
 270                 e->msi.data = ue->u.msi.data;
 271                 break;
 272         default:
 273                 goto out;
 274         }
 275         r = 0;
 276 out:
 277         return r;
 278 }
 279
 280
 281 int kvm_set_irq_routing(struct kvm *kvm,
 282                         const struct kvm_irq_routing_entry *ue,
 283                         unsigned nr,
 284                         unsigned flags)
 285 {
 286         struct list_head irq_list = LIST_HEAD_INIT(irq_list);
 287         struct list_head tmp = LIST_HEAD_INIT(tmp);
 288         struct kvm_kernel_irq_routing_entry *e = NULL;
 289         unsigned i;
 290         int r;
 291
 292         for (i = 0; i < nr; ++i) {
 293                 r = -EINVAL;
 294                 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
 295                         goto out;
 296                 if (ue->flags)
 297                         goto out;
 298                 r = -ENOMEM;
 299                 e = kzalloc(sizeof(*e), GFP_KERNEL);
 300                 if (!e)
 301                         goto out;
 302                 r = setup_routing_entry(e, ue);
 303                 if (r)
 304                         goto out;
 305                 ++ue;
 306                 list_add(&e->link, &irq_list);
 307                 e = NULL;
 308         }
 309
 310         mutex_lock(&kvm->lock);
 311         list_splice(&kvm->irq_routing, &tmp);
 312         INIT_LIST_HEAD(&kvm->irq_routing);
 313         list_splice(&irq_list, &kvm->irq_routing);
 314         INIT_LIST_HEAD(&irq_list);
 315         list_splice(&tmp, &irq_list);
 316         mutex_unlock(&kvm->lock);
 317
 318         r = 0;
 319
 320 out:
 321         kfree(e);
 322         __kvm_free_irq_routing(&irq_list);
 323         return r;
 324 }
 325
 326 #define IOAPIC_ROUTING_ENTRY(irq) \
 327         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 328           .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
 329 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
 330
 331 #ifdef CONFIG_X86
 332 #  define PIC_ROUTING_ENTRY(irq) \
 333         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 334           .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
 335 #  define ROUTING_ENTRY2(irq) \
 336         IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
 337 #else
 338 #  define ROUTING_ENTRY2(irq) \
 339         IOAPIC_ROUTING_ENTRY(irq)
 340 #endif
 341
 342 static const struct kvm_irq_routing_entry default_routing[] = {
 343         ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
 344         ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
 345         ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
 346         ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
 347         ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
 348         ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
 349         ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
 350         ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
 351         ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
 352         ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
 353         ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
 354         ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
 355 #ifdef CONFIG_IA64
 356         ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
 357         ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
 358         ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
 359         ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
 360         ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
 361         ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
 362         ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
 363         ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
 364         ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
 365         ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
 366         ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
 367         ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
 368 #endif
 369 };
 370
 371 int kvm_setup_default_irq_routing(struct kvm *kvm)
 372 {
 373         return kvm_set_irq_routing(kvm, default_routing,
 374                                    ARRAY_SIZE(default_routing), 0);
 375 }