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#include "kvm/ioport.h"
#include "kvm/kvm.h"
#include "kvm/util.h"
#include "kvm/brlock.h"
#include "kvm/rbtree-interval.h"
#include "kvm/mutex.h"
#include <linux/kvm.h> /* for KVM_EXIT_* */
#include <linux/types.h>
#include <stdbool.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#define ioport_node(n) rb_entry(n, struct ioport, node)
DEFINE_MUTEX(ioport_mutex);
static u16 free_io_port_idx; /* protected by ioport_mutex */
static struct rb_root ioport_tree = RB_ROOT;
static u16 ioport__find_free_port(void)
{
u16 free_port;
mutex_lock(&ioport_mutex);
free_port = IOPORT_START + free_io_port_idx * IOPORT_SIZE;
free_io_port_idx++;
mutex_unlock(&ioport_mutex);
return free_port;
}
static struct ioport *ioport_search(struct rb_root *root, u64 addr)
{
struct rb_int_node *node;
node = rb_int_search_single(root, addr);
if (node == NULL)
return NULL;
return ioport_node(node);
}
static int ioport_insert(struct rb_root *root, struct ioport *data)
{
return rb_int_insert(root, &data->node);
}
static void ioport_remove(struct rb_root *root, struct ioport *data)
{
rb_int_erase(root, &data->node);
}
#ifdef CONFIG_HAS_LIBFDT
static void generate_ioport_fdt_node(void *fdt,
struct device_header *dev_hdr,
void (*generate_irq_prop)(void *fdt,
u8 irq,
enum irq_type))
{
struct ioport *ioport = container_of(dev_hdr, struct ioport, dev_hdr);
struct ioport_operations *ops = ioport->ops;
if (ops->generate_fdt_node)
ops->generate_fdt_node(ioport, fdt, generate_irq_prop);
}
#else
static void generate_ioport_fdt_node(void *fdt,
struct device_header *dev_hdr,
void (*generate_irq_prop)(void *fdt,
u8 irq,
enum irq_type))
{
die("Unable to generate device tree nodes without libfdt\n");
}
#endif
int ioport__register(struct kvm *kvm, u16 port, struct ioport_operations *ops, int count, void *param)
{
struct ioport *entry;
int r;
br_write_lock(kvm);
if (port == IOPORT_EMPTY)
port = ioport__find_free_port();
entry = ioport_search(&ioport_tree, port);
if (entry) {
pr_warning("ioport re-registered: %x", port);
rb_int_erase(&ioport_tree, &entry->node);
}
entry = malloc(sizeof(*entry));
if (entry == NULL)
return -ENOMEM;
*entry = (struct ioport) {
.node = RB_INT_INIT(port, port + count),
.ops = ops,
.priv = param,
.dev_hdr = (struct device_header) {
.bus_type = DEVICE_BUS_IOPORT,
.data = generate_ioport_fdt_node,
},
};
r = ioport_insert(&ioport_tree, entry);
if (r < 0) {
free(entry);
br_write_unlock(kvm);
return r;
}
device__register(&entry->dev_hdr);
br_write_unlock(kvm);
return port;
}
int ioport__unregister(struct kvm *kvm, u16 port)
{
struct ioport *entry;
int r;
br_write_lock(kvm);
r = -ENOENT;
entry = ioport_search(&ioport_tree, port);
if (!entry)
goto done;
ioport_remove(&ioport_tree, entry);
free(entry);
r = 0;
done:
br_write_unlock(kvm);
return r;
}
static void ioport__unregister_all(void)
{
struct ioport *entry;
struct rb_node *rb;
struct rb_int_node *rb_node;
rb = rb_first(&ioport_tree);
while (rb) {
rb_node = rb_int(rb);
entry = ioport_node(rb_node);
ioport_remove(&ioport_tree, entry);
free(entry);
rb = rb_first(&ioport_tree);
}
}
static const char *to_direction(int direction)
{
if (direction == KVM_EXIT_IO_IN)
return "IN";
else
return "OUT";
}
static void ioport_error(u16 port, void *data, int direction, int size, u32 count)
{
fprintf(stderr, "IO error: %s port=%x, size=%d, count=%u\n", to_direction(direction), port, size, count);
}
bool kvm__emulate_io(struct kvm_cpu *vcpu, u16 port, void *data, int direction, int size, u32 count)
{
struct ioport_operations *ops;
bool ret = false;
struct ioport *entry;
void *ptr = data;
struct kvm *kvm = vcpu->kvm;
br_read_lock();
entry = ioport_search(&ioport_tree, port);
if (!entry)
goto out;
ops = entry->ops;
while (count--) {
if (direction == KVM_EXIT_IO_IN && ops->io_in)
ret = ops->io_in(entry, vcpu, port, ptr, size);
else if (direction == KVM_EXIT_IO_OUT && ops->io_out)
ret = ops->io_out(entry, vcpu, port, ptr, size);
ptr += size;
}
out:
br_read_unlock();
if (ret)
return true;
if (kvm->cfg.ioport_debug)
ioport_error(port, data, direction, size, count);
return !kvm->cfg.ioport_debug;
}
int ioport__init(struct kvm *kvm)
{
ioport__setup_arch(kvm);
return 0;
}
dev_base_init(ioport__init);
int ioport__exit(struct kvm *kvm)
{
ioport__unregister_all();
return 0;
}
dev_base_exit(ioport__exit);
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