/*
* KVM in-kernel OpenPIC
*
* Copyright 2013 Freescale Semiconductor, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "cpu.h"
#include <sys/ioctl.h>
#include "exec/address-spaces.h"
#include "hw/hw.h"
#include "hw/ppc/openpic.h"
#include "hw/pci/msi.h"
#include "hw/sysbus.h"
#include "sysemu/kvm.h"
#include "qemu/log.h"
#define GCR_RESET 0x80000000
#define KVM_OPENPIC(obj) \
OBJECT_CHECK(KVMOpenPICState, (obj), TYPE_KVM_OPENPIC)
typedef struct KVMOpenPICState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion mem;
MemoryListener mem_listener;
uint32_t fd;
uint32_t model;
hwaddr mapped;
} KVMOpenPICState;
static void kvm_openpic_set_irq(void *opaque, int n_IRQ, int level)
{
kvm_set_irq(kvm_state, n_IRQ, level);
}
static void kvm_openpic_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
KVMOpenPICState *opp = opaque;
struct kvm_device_attr attr;
uint32_t val32 = val;
int ret;
attr.group = KVM_DEV_MPIC_GRP_REGISTER;
attr.attr = addr;
attr.addr = (uint64_t)(unsigned long)&val32;
ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
if (ret < 0) {
qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__,
strerror(errno), attr.attr);
}
}
static void kvm_openpic_reset(DeviceState *d)
{
KVMOpenPICState *opp = KVM_OPENPIC(d);
/* Trigger the GCR.RESET bit to reset the PIC */
kvm_openpic_write(opp, 0x1020, GCR_RESET, sizeof(uint32_t));
}
static uint64_t kvm_openpic_read(void *opaque, hwaddr addr, unsigned size)
{
KVMOpenPICState *opp = opaque;
struct kvm_device_attr attr;
uint32_t val = 0xdeadbeef;
int ret;
attr.group = KVM_DEV_MPIC_GRP_REGISTER;
attr.attr = addr;
attr.addr = (uint64_t)(unsigned long)&val;
ret = ioctl(opp->fd, KVM_GET_DEVICE_ATTR, &attr);
if (ret < 0) {
qemu_log_mask(LOG_UNIMP, "%s: %s %" PRIx64 "\n", __func__,
strerror(errno), attr.attr);
return 0;
}
return val;
}
static const MemoryRegionOps kvm_openpic_mem_ops = {
.write = kvm_openpic_write,
.read = kvm_openpic_read,
.endianness = DEVICE_BIG_ENDIAN,
.impl = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void kvm_openpic_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
KVMOpenPICState *opp = container_of(listener, KVMOpenPICState,
mem_listener);
struct kvm_device_attr attr;
uint64_t reg_base;
int ret;
if (section->fv != address_space_to_flatview(&address_space_memory)) {
abort();
}
/* Ignore events on regions that are not us */
if (section->mr != &opp->mem) {
return;
}
if (opp->mapped) {
/*
* We can only map the MPIC once. Since we are already mapped,
* the best we can do is ignore new maps.
*/
return;
}
reg_base = section->offset_within_address_space;
opp->mapped = reg_base;
attr.group = KVM_DEV_MPIC_GRP_MISC;
attr.attr = KVM_DEV_MPIC_BASE_ADDR;
attr.addr = (uint64_t)(unsigned long)®_base;
ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
if (ret < 0) {
fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__,
strerror(errno), reg_base);
}
}
static void kvm_openpic_region_del(MemoryListener *listener,
MemoryRegionSection *section)
{
KVMOpenPICState *opp = container_of(listener, KVMOpenPICState,
mem_listener);
struct kvm_device_attr attr;
uint64_t reg_base = 0;
int ret;
/* Ignore events on regions that are not us */
if (section->mr != &opp->mem) {
return;
}
if (section->offset_within_address_space != opp->mapped) {
/*
* We can only map the MPIC once. This mapping was a secondary
* one that we couldn't fulfill. Ignore it.
*/
return;
}
opp->mapped = 0;
attr.group = KVM_DEV_MPIC_GRP_MISC;
attr.attr = KVM_DEV_MPIC_BASE_ADDR;
attr.addr = (uint64_t)(unsigned long)®_base;
ret = ioctl(opp->fd, KVM_SET_DEVICE_ATTR, &attr);
if (ret < 0) {
fprintf(stderr, "%s: %s %" PRIx64 "\n", __func__,
strerror(errno), reg_base);
}
}
static void kvm_openpic_init(Object *obj)
{
KVMOpenPICState *opp = KVM_OPENPIC(obj);
memory_region_init_io(&opp->mem, OBJECT(opp), &kvm_openpic_mem_ops, opp,
"kvm-openpic", 0x40000);
}
static void kvm_openpic_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *d = SYS_BUS_DEVICE(dev);
KVMOpenPICState *opp = KVM_OPENPIC(dev);
KVMState *s = kvm_state;
int kvm_openpic_model;
struct kvm_create_device cd = {0};
int ret, i;
if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
error_setg(errp, "Kernel is lacking Device Control API");
return;
}
switch (opp->model) {
case OPENPIC_MODEL_FSL_MPIC_20:
kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_20;
break;
case OPENPIC_MODEL_FSL_MPIC_42:
kvm_openpic_model = KVM_DEV_TYPE_FSL_MPIC_42;
break;
default:
error_setg(errp, "Unsupported OpenPIC model %" PRIu32, opp->model);
return;
}
cd.type = kvm_openpic_model;
ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &cd);
if (ret < 0) {
error_setg(errp, "Can't create device %d: %s",
cd.type, strerror(errno));
return;
}
opp->fd = cd.fd;
sysbus_init_mmio(d, &opp->mem);
qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ);
opp->mem_listener.region_add = kvm_openpic_region_add;
opp->mem_listener.region_del = kvm_openpic_region_del;
memory_listener_register(&opp->mem_listener, &address_space_memory);
/* indicate pic capabilities */
msi_nonbroken = true;
kvm_kernel_irqchip = true;
kvm_async_interrupts_allowed = true;
/* set up irq routing */
kvm_init_irq_routing(kvm_state);
for (i = 0; i < 256; ++i) {
kvm_irqchip_add_irq_route(kvm_state, i, 0, i);
}
kvm_msi_via_irqfd_allowed = true;
kvm_gsi_routing_allowed = true;
kvm_irqchip_commit_routes(s);
}
int kvm_openpic_connect_vcpu(DeviceState *d, CPUState *cs)
{
KVMOpenPICState *opp = KVM_OPENPIC(d);
return kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_MPIC, 0, opp->fd,
kvm_arch_vcpu_id(cs));
}
static Property kvm_openpic_properties[] = {
DEFINE_PROP_UINT32("model", KVMOpenPICState, model,
OPENPIC_MODEL_FSL_MPIC_20),
DEFINE_PROP_END_OF_LIST(),
};
static void kvm_openpic_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = kvm_openpic_realize;
dc->props = kvm_openpic_properties;
dc->reset = kvm_openpic_reset;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static const TypeInfo kvm_openpic_info = {
.name = TYPE_KVM_OPENPIC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(KVMOpenPICState),
.instance_init = kvm_openpic_init,
.class_init = kvm_openpic_class_init,
};
static void kvm_openpic_register_types(void)
{
type_register_static(&kvm_openpic_info);
}
type_init(kvm_openpic_register_types)