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#include <stdlib.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/kvm.h>
#include <errno.h>
#include "kvm/kvm.h"
#include "kvm/irq.h"
#include "kvm/kvm-arch.h"
static u8 next_line = KVM_IRQ_OFFSET;
static int allocated_gsis = 0;
int next_gsi;
struct msi_routing_ops irq__default_routing_ops;
struct msi_routing_ops *msi_routing_ops = &irq__default_routing_ops;
struct kvm_irq_routing *irq_routing = NULL;
int irq__alloc_line(void)
{
return next_line++;
}
int irq__get_nr_allocated_lines(void)
{
return next_line - KVM_IRQ_OFFSET;
}
int irq__allocate_routing_entry(void)
{
size_t table_size = sizeof(struct kvm_irq_routing);
size_t old_size = table_size;
int nr_entries = 0;
if (irq_routing)
nr_entries = irq_routing->nr;
if (nr_entries < allocated_gsis)
return 0;
old_size += sizeof(struct kvm_irq_routing_entry) * allocated_gsis;
allocated_gsis = ALIGN(nr_entries + 1, 32);
table_size += sizeof(struct kvm_irq_routing_entry) * allocated_gsis;
irq_routing = realloc(irq_routing, table_size);
if (irq_routing == NULL)
return -ENOMEM;
memset((void *)irq_routing + old_size, 0, table_size - old_size);
irq_routing->nr = nr_entries;
irq_routing->flags = 0;
return 0;
}
static bool check_for_irq_routing(struct kvm *kvm)
{
static int has_irq_routing = 0;
if (has_irq_routing == 0) {
if (kvm__supports_extension(kvm, KVM_CAP_IRQ_ROUTING))
has_irq_routing = 1;
else
has_irq_routing = -1;
}
return has_irq_routing > 0;
}
static int irq__update_msix_routes(struct kvm *kvm,
struct kvm_irq_routing_entry *entry)
{
return ioctl(kvm->vm_fd, KVM_SET_GSI_ROUTING, irq_routing);
}
static bool irq__default_can_signal_msi(struct kvm *kvm)
{
return kvm__supports_extension(kvm, KVM_CAP_SIGNAL_MSI);
}
static int irq__default_signal_msi(struct kvm *kvm, struct kvm_msi *msi)
{
return ioctl(kvm->vm_fd, KVM_SIGNAL_MSI, msi);
}
struct msi_routing_ops irq__default_routing_ops = {
.update_route = irq__update_msix_routes,
.signal_msi = irq__default_signal_msi,
.can_signal_msi = irq__default_can_signal_msi,
};
bool irq__can_signal_msi(struct kvm *kvm)
{
return msi_routing_ops->can_signal_msi(kvm);
}
int irq__signal_msi(struct kvm *kvm, struct kvm_msi *msi)
{
return msi_routing_ops->signal_msi(kvm, msi);
}
int irq__add_msix_route(struct kvm *kvm, struct msi_msg *msg, u32 device_id)
{
int r;
struct kvm_irq_routing_entry *entry;
if (!check_for_irq_routing(kvm))
return -ENXIO;
r = irq__allocate_routing_entry();
if (r)
return r;
entry = &irq_routing->entries[irq_routing->nr];
*entry = (struct kvm_irq_routing_entry) {
.gsi = next_gsi,
.type = KVM_IRQ_ROUTING_MSI,
.u.msi.address_hi = msg->address_hi,
.u.msi.address_lo = msg->address_lo,
.u.msi.data = msg->data,
};
if (kvm->msix_needs_devid) {
entry->flags = KVM_MSI_VALID_DEVID;
entry->u.msi.devid = device_id;
}
irq_routing->nr++;
r = msi_routing_ops->update_route(kvm, entry);
if (r)
return r;
return next_gsi++;
}
static bool update_data(u32 *ptr, u32 newdata)
{
if (*ptr == newdata)
return false;
*ptr = newdata;
return true;
}
void irq__update_msix_route(struct kvm *kvm, u32 gsi, struct msi_msg *msg)
{
struct kvm_irq_routing_msi *entry;
unsigned int i;
bool changed;
for (i = 0; i < irq_routing->nr; i++)
if (gsi == irq_routing->entries[i].gsi)
break;
if (i == irq_routing->nr)
return;
entry = &irq_routing->entries[i].u.msi;
changed = update_data(&entry->address_hi, msg->address_hi);
changed |= update_data(&entry->address_lo, msg->address_lo);
changed |= update_data(&entry->data, msg->data);
if (!changed)
return;
if (msi_routing_ops->update_route(kvm, &irq_routing->entries[i]))
die_perror("KVM_SET_GSI_ROUTING");
}
int irq__common_add_irqfd(struct kvm *kvm, unsigned int gsi, int trigger_fd,
int resample_fd)
{
struct kvm_irqfd irqfd = {
.fd = trigger_fd,
.gsi = gsi,
.flags = resample_fd > 0 ? KVM_IRQFD_FLAG_RESAMPLE : 0,
.resamplefd = resample_fd,
};
/* If we emulate MSI routing, translate the MSI to the corresponding IRQ */
if (msi_routing_ops->translate_gsi)
irqfd.gsi = msi_routing_ops->translate_gsi(kvm, gsi);
return ioctl(kvm->vm_fd, KVM_IRQFD, &irqfd);
}
void irq__common_del_irqfd(struct kvm *kvm, unsigned int gsi, int trigger_fd)
{
struct kvm_irqfd irqfd = {
.fd = trigger_fd,
.gsi = gsi,
.flags = KVM_IRQFD_FLAG_DEASSIGN,
};
if (msi_routing_ops->translate_gsi)
irqfd.gsi = msi_routing_ops->translate_gsi(kvm, gsi);
ioctl(kvm->vm_fd, KVM_IRQFD, &irqfd);
}
int __attribute__((weak)) irq__exit(struct kvm *kvm)
{
free(irq_routing);
return 0;
}
dev_base_exit(irq__exit);
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