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   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, lowest = -1;
  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                 if (!low_prio) {
  68                         __set_bit(i, deliver_bitmask);
  69                 } else {
  70                         if (lowest < 0)
  71                                 lowest = i;
  72                         if (kvm_apic_compare_prio(vcpu, kvm->vcpus[lowest]) < 0)
  73                                 lowest = i;
  74                 }
  75         }
  76
  77         if (lowest != -1)
  78                 __set_bit(lowest, deliver_bitmask);
  79 }
  80
  81 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
  82                        struct kvm *kvm, int level)
  83 {
  84         union kvm_ioapic_redirect_entry entry;
  85
  86         entry.bits = 0;
  87         entry.fields.dest_id = (e->msi.address_lo &
  88                         MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
  89         entry.fields.vector = (e->msi.data &
  90                         MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
  91         entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
  92                         (unsigned long *)&e->msi.address_lo);
  93         entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
  94                         (unsigned long *)&e->msi.data);
  95         entry.fields.delivery_mode = test_bit(
  96                         MSI_DATA_DELIVERY_MODE_SHIFT,
  97                         (unsigned long *)&e->msi.data);
  98
  99         /* TODO Deal with RH bit of MSI message address */
 100         return ioapic_deliver_entry(kvm, &entry);
 101 }
 102
 103 /* This should be called with the kvm->lock mutex held
 104  * Return value:
 105  *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 106  *  = 0   Interrupt was coalesced (previous irq is still pending)
 107  *  > 0   Number of CPUs interrupt was delivered to
 108  */
 109 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
 110 {
 111         struct kvm_kernel_irq_routing_entry *e;
 112         unsigned long *irq_state, sig_level;
 113         int ret = -1;
 114
 115         if (irq < KVM_IOAPIC_NUM_PINS) {
 116                 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
 117
 118                 /* Logical OR for level trig interrupt */
 119                 if (level)
 120                         set_bit(irq_source_id, irq_state);
 121                 else
 122                         clear_bit(irq_source_id, irq_state);
 123                 sig_level = !!(*irq_state);
 124         } else /* Deal with MSI/MSI-X */
 125                 sig_level = 1;
 126
 127         /* Not possible to detect if the guest uses the PIC or the
 128          * IOAPIC.  So set the bit in both. The guest will ignore
 129          * writes to the unused one.
 130          */
 131         list_for_each_entry(e, &kvm->irq_routing, link)
 132                 if (e->gsi == irq) {
 133                         int r = e->set(e, kvm, sig_level);
 134                         if (r < 0)
 135                                 continue;
 136
 137                         ret = r + ((ret < 0) ? 0 : ret);
 138                 }
 139         return ret;
 140 }
 141
 142 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
 143 {
 144         struct kvm_kernel_irq_routing_entry *e;
 145         struct kvm_irq_ack_notifier *kian;
 146         struct hlist_node *n;
 147         unsigned gsi = pin;
 148
 149         list_for_each_entry(e, &kvm->irq_routing, link)
 150                 if (e->irqchip.irqchip == irqchip &&
 151                     e->irqchip.pin == pin) {
 152                         gsi = e->gsi;
 153                         break;
 154                 }
 155
 156         hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
 157                 if (kian->gsi == gsi)
 158                         kian->irq_acked(kian);
 159 }
 160
 161 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 162                                    struct kvm_irq_ack_notifier *kian)
 163 {
 164         hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
 165 }
 166
 167 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
 168 {
 169         hlist_del_init(&kian->link);
 170 }
 171
 172 /* The caller must hold kvm->lock mutex */
 173 int kvm_request_irq_source_id(struct kvm *kvm)
 174 {
 175         unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
 176         int irq_source_id = find_first_zero_bit(bitmap,
 177                                 sizeof(kvm->arch.irq_sources_bitmap));
 178
 179         if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 180                 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
 181                 return -EFAULT;
 182         }
 183
 184         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 185         set_bit(irq_source_id, bitmap);
 186
 187         return irq_source_id;
 188 }
 189
 190 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 191 {
 192         int i;
 193
 194         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 195
 196         if (irq_source_id < 0 ||
 197             irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 198                 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
 199                 return;
 200         }
 201         for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
 202                 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
 203         clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
 204 }
 205
 206 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 207                                     struct kvm_irq_mask_notifier *kimn)
 208 {
 209         kimn->irq = irq;
 210         hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
 211 }
 212
 213 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 214                                       struct kvm_irq_mask_notifier *kimn)
 215 {
 216         hlist_del(&kimn->link);
 217 }
 218
 219 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
 220 {
 221         struct kvm_irq_mask_notifier *kimn;
 222         struct hlist_node *n;
 223
 224         hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
 225                 if (kimn->irq == irq)
 226                         kimn->func(kimn, mask);
 227 }
 228
 229 static void __kvm_free_irq_routing(struct list_head *irq_routing)
 230 {
 231         struct kvm_kernel_irq_routing_entry *e, *n;
 232
 233         list_for_each_entry_safe(e, n, irq_routing, link)
 234                 kfree(e);
 235 }
 236
 237 void kvm_free_irq_routing(struct kvm *kvm)
 238 {
 239         __kvm_free_irq_routing(&kvm->irq_routing);
 240 }
 241
 242 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
 243                                const struct kvm_irq_routing_entry *ue)
 244 {
 245         int r = -EINVAL;
 246         int delta;
 247
 248         e->gsi = ue->gsi;
 249         switch (ue->type) {
 250         case KVM_IRQ_ROUTING_IRQCHIP:
 251                 delta = 0;
 252                 switch (ue->u.irqchip.irqchip) {
 253                 case KVM_IRQCHIP_PIC_MASTER:
 254                         e->set = kvm_set_pic_irq;
 255                         break;
 256                 case KVM_IRQCHIP_PIC_SLAVE:
 257                         e->set = kvm_set_pic_irq;
 258                         delta = 8;
 259                         break;
 260                 case KVM_IRQCHIP_IOAPIC:
 261                                 e->set = kvm_set_ioapic_irq;
 262                         break;
 263                 default:
 264                         goto out;
 265                 }
 266                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
 267                 e->irqchip.pin = ue->u.irqchip.pin + delta;
 268                 break;
 269         case KVM_IRQ_ROUTING_MSI:
 270                 e->set = kvm_set_msi;
 271                 e->msi.address_lo = ue->u.msi.address_lo;
 272                 e->msi.address_hi = ue->u.msi.address_hi;
 273                 e->msi.data = ue->u.msi.data;
 274                 break;
 275         default:
 276                 goto out;
 277         }
 278         r = 0;
 279 out:
 280         return r;
 281 }
 282
 283
 284 int kvm_set_irq_routing(struct kvm *kvm,
 285                         const struct kvm_irq_routing_entry *ue,
 286                         unsigned nr,
 287                         unsigned flags)
 288 {
 289         struct list_head irq_list = LIST_HEAD_INIT(irq_list);
 290         struct list_head tmp = LIST_HEAD_INIT(tmp);
 291         struct kvm_kernel_irq_routing_entry *e = NULL;
 292         unsigned i;
 293         int r;
 294
 295         for (i = 0; i < nr; ++i) {
 296                 r = -EINVAL;
 297                 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
 298                         goto out;
 299                 if (ue->flags)
 300                         goto out;
 301                 r = -ENOMEM;
 302                 e = kzalloc(sizeof(*e), GFP_KERNEL);
 303                 if (!e)
 304                         goto out;
 305                 r = setup_routing_entry(e, ue);
 306                 if (r)
 307                         goto out;
 308                 ++ue;
 309                 list_add(&e->link, &irq_list);
 310                 e = NULL;
 311         }
 312
 313         mutex_lock(&kvm->lock);
 314         list_splice(&kvm->irq_routing, &tmp);
 315         INIT_LIST_HEAD(&kvm->irq_routing);
 316         list_splice(&irq_list, &kvm->irq_routing);
 317         INIT_LIST_HEAD(&irq_list);
 318         list_splice(&tmp, &irq_list);
 319         mutex_unlock(&kvm->lock);
 320
 321         r = 0;
 322
 323 out:
 324         kfree(e);
 325         __kvm_free_irq_routing(&irq_list);
 326         return r;
 327 }
 328
 329 #define IOAPIC_ROUTING_ENTRY(irq) \
 330         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 331           .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
 332 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
 333
 334 #ifdef CONFIG_X86
 335 #  define PIC_ROUTING_ENTRY(irq) \
 336         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 337           .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
 338 #  define ROUTING_ENTRY2(irq) \
 339         IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
 340 #else
 341 #  define ROUTING_ENTRY2(irq) \
 342         IOAPIC_ROUTING_ENTRY(irq)
 343 #endif
 344
 345 static const struct kvm_irq_routing_entry default_routing[] = {
 346         ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
 347         ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
 348         ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
 349         ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
 350         ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
 351         ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
 352         ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
 353         ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
 354         ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
 355         ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
 356         ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
 357         ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
 358 #ifdef CONFIG_IA64
 359         ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
 360         ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
 361         ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
 362         ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
 363         ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
 364         ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
 365         ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
 366         ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
 367         ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
 368         ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
 369         ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
 370         ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
 371 #endif
 372 };
 373
 374 int kvm_setup_default_irq_routing(struct kvm *kvm)
 375 {
 376         return kvm_set_irq_routing(kvm, default_routing,
 377                                    ARRAY_SIZE(default_routing), 0);
 378 }