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/*
* GICv2m extension for MSI/MSI-x support with a GICv2-based system
*
* Copyright (C) 2015 Linaro, All rights reserved.
*
* Author: Christoffer Dall <christoffer.dall@linaro.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/* This file implements an emulated GICv2m widget as described in the ARM
* Server Base System Architecture (SBSA) specification Version 2.2
* (ARM-DEN-0029 v2.2) pages 35-39 without any optional implementation defined
* identification registers and with a single non-secure MSI register frame.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/sysbus.h"
#include "hw/irq.h"
#include "hw/pci/msi.h"
#include "hw/qdev-properties.h"
#include "system/kvm.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qom/object.h"
#define TYPE_ARM_GICV2M "arm-gicv2m"
OBJECT_DECLARE_SIMPLE_TYPE(ARMGICv2mState, ARM_GICV2M)
#define GICV2M_NUM_SPI_MAX 128
#define V2M_MSI_TYPER 0x008
#define V2M_MSI_SETSPI_NS 0x040
#define V2M_MSI_IIDR 0xFCC
#define V2M_IIDR0 0xFD0
#define V2M_IIDR11 0xFFC
#define PRODUCT_ID_QEMU 0x51 /* ASCII code Q */
struct ARMGICv2mState {
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq spi[GICV2M_NUM_SPI_MAX];
uint32_t base_spi;
uint32_t num_spi;
};
static void gicv2m_set_irq(void *opaque, int irq)
{
ARMGICv2mState *s = (ARMGICv2mState *)opaque;
qemu_irq_pulse(s->spi[irq]);
}
static uint64_t gicv2m_read(void *opaque, hwaddr offset,
unsigned size)
{
ARMGICv2mState *s = (ARMGICv2mState *)opaque;
uint32_t val;
if (size != 4) {
qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_read: bad size %u\n", size);
return 0;
}
switch (offset) {
case V2M_MSI_TYPER:
val = (s->base_spi + 32) << 16;
val |= s->num_spi;
return val;
case V2M_MSI_IIDR:
/* We don't have any valid implementor so we leave that field as zero
* and we return 0 in the arch revision as per the spec.
*/
return (PRODUCT_ID_QEMU << 20);
case V2M_IIDR0 ... V2M_IIDR11:
/* We do not implement any optional identification registers and the
* mandatory MSI_PIDR2 register reads as 0x0, so we capture all
* implementation defined registers here.
*/
return 0;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"gicv2m_read: Bad offset %x\n", (int)offset);
return 0;
}
}
static void gicv2m_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
ARMGICv2mState *s = (ARMGICv2mState *)opaque;
if (size != 2 && size != 4) {
qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_write: bad size %u\n", size);
return;
}
switch (offset) {
case V2M_MSI_SETSPI_NS: {
int spi;
spi = (value & 0x3ff) - (s->base_spi + 32);
if (spi >= 0 && spi < s->num_spi) {
gicv2m_set_irq(s, spi);
}
return;
}
default:
qemu_log_mask(LOG_GUEST_ERROR,
"gicv2m_write: Bad offset %x\n", (int)offset);
}
}
static const MemoryRegionOps gicv2m_ops = {
.read = gicv2m_read,
.write = gicv2m_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void gicv2m_realize(DeviceState *dev, Error **errp)
{
ARMGICv2mState *s = ARM_GICV2M(dev);
int i;
if (s->num_spi > GICV2M_NUM_SPI_MAX) {
error_setg(errp,
"requested %u SPIs exceeds GICv2m frame maximum %d",
s->num_spi, GICV2M_NUM_SPI_MAX);
return;
}
if (s->base_spi + 32 > 1020 - s->num_spi) {
error_setg(errp,
"requested base SPI %u+%u exceeds max. number 1020",
s->base_spi + 32, s->num_spi);
return;
}
for (i = 0; i < s->num_spi; i++) {
sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->spi[i]);
}
msi_nonbroken = true;
kvm_gsi_direct_mapping = true;
kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
}
static void gicv2m_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
ARMGICv2mState *s = ARM_GICV2M(obj);
memory_region_init_io(&s->iomem, OBJECT(s), &gicv2m_ops, s,
"gicv2m", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
}
static const Property gicv2m_properties[] = {
DEFINE_PROP_UINT32("base-spi", ARMGICv2mState, base_spi, 0),
DEFINE_PROP_UINT32("num-spi", ARMGICv2mState, num_spi, 64),
};
static void gicv2m_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_props(dc, gicv2m_properties);
dc->realize = gicv2m_realize;
}
static const TypeInfo gicv2m_info = {
.name = TYPE_ARM_GICV2M,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(ARMGICv2mState),
.instance_init = gicv2m_init,
.class_init = gicv2m_class_init,
};
static void gicv2m_register_types(void)
{
type_register_static(&gicv2m_info);
}
type_init(gicv2m_register_types)
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