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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_ioapic *ioapic,
  47                                    union kvm_ioapic_redirect_entry *entry,
  48                                    unsigned long *deliver_bitmask)
  49 {
  50         struct kvm_vcpu *vcpu;
  51
  52         kvm_ioapic_get_delivery_bitmask(ioapic, entry->fields.dest_id,
  53                                         entry->fields.dest_mode,
  54                                         deliver_bitmask);
  55         switch (entry->fields.delivery_mode) {
  56         case IOAPIC_LOWEST_PRIORITY:
  57                 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
  58                                 entry->fields.vector, *deliver_bitmask);
  59                 *deliver_bitmask = 1 << vcpu->vcpu_id;
  60                 break;
  61         case IOAPIC_FIXED:
  62         case IOAPIC_NMI:
  63                 break;
  64         default:
  65                 if (printk_ratelimit())
  66                         printk(KERN_INFO "kvm: unsupported delivery mode %d\n",
  67                                 entry->fields.delivery_mode);
  68                 *deliver_bitmask = 0;
  69         }
  70 }
  71
  72 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
  73                        struct kvm *kvm, int level)
  74 {
  75         int vcpu_id, r = -1;
  76         struct kvm_vcpu *vcpu;
  77         struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
  78         union kvm_ioapic_redirect_entry entry;
  79         unsigned long deliver_bitmask;
  80
  81         BUG_ON(!ioapic);
  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
  98         kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
  99
 100         if (!deliver_bitmask) {
 101                 printk(KERN_WARNING "kvm: no destination for MSI delivery!");
 102                 return -1;
 103         }
 104         for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
 105                 if (!(deliver_bitmask & (1 << vcpu_id)))
 106                         continue;
 107                 deliver_bitmask &= ~(1 << vcpu_id);
 108                 vcpu = ioapic->kvm->vcpus[vcpu_id];
 109                 if (vcpu) {
 110                         if (r < 0)
 111                                 r = 0;
 112                         r += kvm_apic_set_irq(vcpu, entry.fields.vector,
 113                                               entry.fields.trig_mode);
 114                 }
 115         }
 116         return r;
 117 }
 118
 119 /* This should be called with the kvm->lock mutex held
 120  * Return value:
 121  *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 122  *  = 0   Interrupt was coalesced (previous irq is still pending)
 123  *  > 0   Number of CPUs interrupt was delivered to
 124  */
 125 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
 126 {
 127         struct kvm_kernel_irq_routing_entry *e;
 128         unsigned long *irq_state, sig_level;
 129         int ret = -1;
 130
 131         if (irq < KVM_IOAPIC_NUM_PINS) {
 132                 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
 133
 134                 /* Logical OR for level trig interrupt */
 135                 if (level)
 136                         set_bit(irq_source_id, irq_state);
 137                 else
 138                         clear_bit(irq_source_id, irq_state);
 139                 sig_level = !!(*irq_state);
 140         } else /* Deal with MSI/MSI-X */
 141                 sig_level = 1;
 142
 143         /* Not possible to detect if the guest uses the PIC or the
 144          * IOAPIC.  So set the bit in both. The guest will ignore
 145          * writes to the unused one.
 146          */
 147         list_for_each_entry(e, &kvm->irq_routing, link)
 148                 if (e->gsi == irq) {
 149                         int r = e->set(e, kvm, sig_level);
 150                         if (r < 0)
 151                                 continue;
 152
 153                         ret = r + ((ret < 0) ? 0 : ret);
 154                 }
 155         return ret;
 156 }
 157
 158 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
 159 {
 160         struct kvm_kernel_irq_routing_entry *e;
 161         struct kvm_irq_ack_notifier *kian;
 162         struct hlist_node *n;
 163         unsigned gsi = pin;
 164
 165         list_for_each_entry(e, &kvm->irq_routing, link)
 166                 if (e->irqchip.irqchip == irqchip &&
 167                     e->irqchip.pin == pin) {
 168                         gsi = e->gsi;
 169                         break;
 170                 }
 171
 172         hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
 173                 if (kian->gsi == gsi)
 174                         kian->irq_acked(kian);
 175 }
 176
 177 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 178                                    struct kvm_irq_ack_notifier *kian)
 179 {
 180         hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
 181 }
 182
 183 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
 184 {
 185         hlist_del_init(&kian->link);
 186 }
 187
 188 /* The caller must hold kvm->lock mutex */
 189 int kvm_request_irq_source_id(struct kvm *kvm)
 190 {
 191         unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
 192         int irq_source_id = find_first_zero_bit(bitmap,
 193                                 sizeof(kvm->arch.irq_sources_bitmap));
 194
 195         if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 196                 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
 197                 return -EFAULT;
 198         }
 199
 200         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 201         set_bit(irq_source_id, bitmap);
 202
 203         return irq_source_id;
 204 }
 205
 206 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 207 {
 208         int i;
 209
 210         ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
 211
 212         if (irq_source_id < 0 ||
 213             irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
 214                 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
 215                 return;
 216         }
 217         for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
 218                 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
 219         clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
 220 }
 221
 222 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
 223                                     struct kvm_irq_mask_notifier *kimn)
 224 {
 225         kimn->irq = irq;
 226         hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
 227 }
 228
 229 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 230                                       struct kvm_irq_mask_notifier *kimn)
 231 {
 232         hlist_del(&kimn->link);
 233 }
 234
 235 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
 236 {
 237         struct kvm_irq_mask_notifier *kimn;
 238         struct hlist_node *n;
 239
 240         hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
 241                 if (kimn->irq == irq)
 242                         kimn->func(kimn, mask);
 243 }
 244
 245 static void __kvm_free_irq_routing(struct list_head *irq_routing)
 246 {
 247         struct kvm_kernel_irq_routing_entry *e, *n;
 248
 249         list_for_each_entry_safe(e, n, irq_routing, link)
 250                 kfree(e);
 251 }
 252
 253 void kvm_free_irq_routing(struct kvm *kvm)
 254 {
 255         __kvm_free_irq_routing(&kvm->irq_routing);
 256 }
 257
 258 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
 259                                const struct kvm_irq_routing_entry *ue)
 260 {
 261         int r = -EINVAL;
 262         int delta;
 263
 264         e->gsi = ue->gsi;
 265         switch (ue->type) {
 266         case KVM_IRQ_ROUTING_IRQCHIP:
 267                 delta = 0;
 268                 switch (ue->u.irqchip.irqchip) {
 269                 case KVM_IRQCHIP_PIC_MASTER:
 270                         e->set = kvm_set_pic_irq;
 271                         break;
 272                 case KVM_IRQCHIP_PIC_SLAVE:
 273                         e->set = kvm_set_pic_irq;
 274                         delta = 8;
 275                         break;
 276                 case KVM_IRQCHIP_IOAPIC:
 277                                 e->set = kvm_set_ioapic_irq;
 278                         break;
 279                 default:
 280                         goto out;
 281                 }
 282                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
 283                 e->irqchip.pin = ue->u.irqchip.pin + delta;
 284                 break;
 285         case KVM_IRQ_ROUTING_MSI:
 286                 e->set = kvm_set_msi;
 287                 e->msi.address_lo = ue->u.msi.address_lo;
 288                 e->msi.address_hi = ue->u.msi.address_hi;
 289                 e->msi.data = ue->u.msi.data;
 290                 break;
 291         default:
 292                 goto out;
 293         }
 294         r = 0;
 295 out:
 296         return r;
 297 }
 298
 299
 300 int kvm_set_irq_routing(struct kvm *kvm,
 301                         const struct kvm_irq_routing_entry *ue,
 302                         unsigned nr,
 303                         unsigned flags)
 304 {
 305         struct list_head irq_list = LIST_HEAD_INIT(irq_list);
 306         struct list_head tmp = LIST_HEAD_INIT(tmp);
 307         struct kvm_kernel_irq_routing_entry *e = NULL;
 308         unsigned i;
 309         int r;
 310
 311         for (i = 0; i < nr; ++i) {
 312                 r = -EINVAL;
 313                 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
 314                         goto out;
 315                 if (ue->flags)
 316                         goto out;
 317                 r = -ENOMEM;
 318                 e = kzalloc(sizeof(*e), GFP_KERNEL);
 319                 if (!e)
 320                         goto out;
 321                 r = setup_routing_entry(e, ue);
 322                 if (r)
 323                         goto out;
 324                 ++ue;
 325                 list_add(&e->link, &irq_list);
 326                 e = NULL;
 327         }
 328
 329         mutex_lock(&kvm->lock);
 330         list_splice(&kvm->irq_routing, &tmp);
 331         INIT_LIST_HEAD(&kvm->irq_routing);
 332         list_splice(&irq_list, &kvm->irq_routing);
 333         INIT_LIST_HEAD(&irq_list);
 334         list_splice(&tmp, &irq_list);
 335         mutex_unlock(&kvm->lock);
 336
 337         r = 0;
 338
 339 out:
 340         kfree(e);
 341         __kvm_free_irq_routing(&irq_list);
 342         return r;
 343 }
 344
 345 #define IOAPIC_ROUTING_ENTRY(irq) \
 346         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 347           .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
 348 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
 349
 350 #ifdef CONFIG_X86
 351 #  define PIC_ROUTING_ENTRY(irq) \
 352         { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
 353           .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
 354 #  define ROUTING_ENTRY2(irq) \
 355         IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
 356 #else
 357 #  define ROUTING_ENTRY2(irq) \
 358         IOAPIC_ROUTING_ENTRY(irq)
 359 #endif
 360
 361 static const struct kvm_irq_routing_entry default_routing[] = {
 362         ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
 363         ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
 364         ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
 365         ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
 366         ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
 367         ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
 368         ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
 369         ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
 370         ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
 371         ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
 372         ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
 373         ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
 374 #ifdef CONFIG_IA64
 375         ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
 376         ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
 377         ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
 378         ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
 379         ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
 380         ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
 381         ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
 382         ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
 383         ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
 384         ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
 385         ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
 386         ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
 387 #endif
 388 };
 389
 390 int kvm_setup_default_irq_routing(struct kvm *kvm)
 391 {
 392         return kvm_set_irq_routing(kvm, default_routing,
 393                                    ARRAY_SIZE(default_routing), 0);
 394 }