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qemu/hw/intc/grlib_irqmp.c
Clément Chigot c9ee67c3c6 hw/intc/grlib_irqmp: abort realize when ncpus value is out of range 
Even if the error is set, the build is not aborted when the ncpus value
is wrong, the return is missing.

Signed-off-by: Clément Chigot <chigot@adacore.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Fixes: 6bf1478543 ("hw/intc/grlib_irqmp: add ncpus property")
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240308152719.591232-1-chigot@adacore.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2024-03-09 19:17:01 +01:00

406 lines
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/*
* QEMU GRLIB IRQMP Emulator
*
* (Extended interrupt not supported)
*
* SPDX-License-Identifier: MIT
*
* Copyright (c) 2010-2024 AdaCore
*
* 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 "hw/irq.h"
#include "hw/sysbus.h"
#include "hw/qdev-properties.h"
#include "hw/intc/grlib_irqmp.h"
#include "trace.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "qom/object.h"
#define IRQMP_MAX_CPU 16
#define IRQMP_REG_SIZE 256 /* Size of memory mapped registers */
/* Memory mapped register offsets */
#define LEVEL_OFFSET 0x00
#define PENDING_OFFSET 0x04
#define FORCE0_OFFSET 0x08
#define CLEAR_OFFSET 0x0C
#define MP_STATUS_OFFSET 0x10
#define BROADCAST_OFFSET 0x14
#define MASK_OFFSET 0x40
#define FORCE_OFFSET 0x80
#define EXTENDED_OFFSET 0xC0
/* Multiprocessor Status Register */
#define MP_STATUS_CPU_STATUS_MASK ((1 << IRQMP_MAX_CPU)-2)
#define MP_STATUS_NCPU_SHIFT 28
#define MAX_PILS 16
OBJECT_DECLARE_SIMPLE_TYPE(IRQMP, GRLIB_IRQMP)
typedef struct IRQMPState IRQMPState;
struct IRQMP {
SysBusDevice parent_obj;
MemoryRegion iomem;
unsigned int ncpus;
IRQMPState *state;
qemu_irq start_signal[IRQMP_MAX_CPU];
qemu_irq irq[IRQMP_MAX_CPU];
};
struct IRQMPState {
uint32_t level;
uint32_t pending;
uint32_t clear;
uint32_t mpstatus;
uint32_t broadcast;
uint32_t mask[IRQMP_MAX_CPU];
uint32_t force[IRQMP_MAX_CPU];
uint32_t extended[IRQMP_MAX_CPU];
IRQMP *parent;
};
static void grlib_irqmp_check_irqs(IRQMPState *state)
{
int i;
assert(state != NULL);
assert(state->parent != NULL);
for (i = 0; i < state->parent->ncpus; i++) {
uint32_t pend = (state->pending | state->force[i]) & state->mask[i];
uint32_t level0 = pend & ~state->level;
uint32_t level1 = pend & state->level;
trace_grlib_irqmp_check_irqs(state->pending, state->force[i],
state->mask[i], level1, level0);
/* Trigger level1 interrupt first and level0 if there is no level1 */
qemu_set_irq(state->parent->irq[i], level1 ?: level0);
}
}
static void grlib_irqmp_ack_mask(IRQMPState *state, unsigned int cpu,
uint32_t mask)
{
/* Clear registers */
state->pending &= ~mask;
state->force[cpu] &= ~mask;
grlib_irqmp_check_irqs(state);
}
void grlib_irqmp_ack(DeviceState *dev, unsigned int cpu, int intno)
{
IRQMP *irqmp = GRLIB_IRQMP(dev);
IRQMPState *state;
uint32_t mask;
state = irqmp->state;
assert(state != NULL);
intno &= 15;
mask = 1 << intno;
trace_grlib_irqmp_ack(intno);
grlib_irqmp_ack_mask(state, cpu, mask);
}
static void grlib_irqmp_set_irq(void *opaque, int irq, int level)
{
IRQMP *irqmp = GRLIB_IRQMP(opaque);
IRQMPState *s;
int i = 0;
s = irqmp->state;
assert(s != NULL);
assert(s->parent != NULL);
if (level) {
trace_grlib_irqmp_set_irq(irq);
if (s->broadcast & 1 << irq) {
/* Broadcasted IRQ */
for (i = 0; i < IRQMP_MAX_CPU; i++) {
s->force[i] |= 1 << irq;
}
} else {
s->pending |= 1 << irq;
}
grlib_irqmp_check_irqs(s);
}
}
static uint64_t grlib_irqmp_read(void *opaque, hwaddr addr,
unsigned size)
{
IRQMP *irqmp = opaque;
IRQMPState *state;
assert(irqmp != NULL);
state = irqmp->state;
assert(state != NULL);
addr &= 0xff;
/* global registers */
switch (addr) {
case LEVEL_OFFSET:
return state->level;
case PENDING_OFFSET:
return state->pending;
case FORCE0_OFFSET:
/* This register is an "alias" for the force register of CPU 0 */
return state->force[0];
case CLEAR_OFFSET:
/* Always read as 0 */
return 0;
case MP_STATUS_OFFSET:
return state->mpstatus;
case BROADCAST_OFFSET:
return state->broadcast;
default:
break;
}
/* mask registers */
if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
int cpu = (addr - MASK_OFFSET) / 4;
assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
return state->mask[cpu];
}
/* force registers */
if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
int cpu = (addr - FORCE_OFFSET) / 4;
assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
return state->force[cpu];
}
/* extended (not supported) */
if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
int cpu = (addr - EXTENDED_OFFSET) / 4;
assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
return state->extended[cpu];
}
trace_grlib_irqmp_readl_unknown(addr);
return 0;
}
static void grlib_irqmp_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
IRQMP *irqmp = opaque;
IRQMPState *state;
int i;
assert(irqmp != NULL);
state = irqmp->state;
assert(state != NULL);
addr &= 0xff;
/* global registers */
switch (addr) {
case LEVEL_OFFSET:
value &= 0xFFFF << 1; /* clean up the value */
state->level = value;
return;
case PENDING_OFFSET:
/* Read Only */
return;
case FORCE0_OFFSET:
/* This register is an "alias" for the force register of CPU 0 */
value &= 0xFFFE; /* clean up the value */
state->force[0] = value;
grlib_irqmp_check_irqs(irqmp->state);
return;
case CLEAR_OFFSET:
value &= ~1; /* clean up the value */
for (i = 0; i < irqmp->ncpus; i++) {
grlib_irqmp_ack_mask(state, i, value);
}
return;
case MP_STATUS_OFFSET:
/*
* Writing and reading operations are reversed for the CPU status.
* Writing "1" will start the CPU, but reading "1" means that the CPU
* is power-down.
*/
value &= MP_STATUS_CPU_STATUS_MASK;
for (i = 0; i < irqmp->ncpus; i++) {
if ((value >> i) & 1) {
qemu_set_irq(irqmp->start_signal[i], 1);
state->mpstatus &= ~(1 << i);
}
}
return;
case BROADCAST_OFFSET:
value &= 0xFFFE; /* clean up the value */
state->broadcast = value;
return;
default:
break;
}
/* mask registers */
if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
int cpu = (addr - MASK_OFFSET) / 4;
assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
value &= ~1; /* clean up the value */
state->mask[cpu] = value;
grlib_irqmp_check_irqs(irqmp->state);
return;
}
/* force registers */
if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
int cpu = (addr - FORCE_OFFSET) / 4;
assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
uint32_t force = value & 0xFFFE;
uint32_t clear = (value >> 16) & 0xFFFE;
uint32_t old = state->force[cpu];
state->force[cpu] = (old | force) & ~clear;
grlib_irqmp_check_irqs(irqmp->state);
return;
}
/* extended (not supported) */
if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
int cpu = (addr - EXTENDED_OFFSET) / 4;
assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
value &= 0xF; /* clean up the value */
state->extended[cpu] = value;
return;
}
trace_grlib_irqmp_writel_unknown(addr, value);
}
static const MemoryRegionOps grlib_irqmp_ops = {
.read = grlib_irqmp_read,
.write = grlib_irqmp_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void grlib_irqmp_reset(DeviceState *d)
{
IRQMP *irqmp = GRLIB_IRQMP(d);
assert(irqmp->state != NULL);
memset(irqmp->state, 0, sizeof *irqmp->state);
irqmp->state->parent = irqmp;
irqmp->state->mpstatus = ((irqmp->ncpus - 1) << MP_STATUS_NCPU_SHIFT) |
((1 << irqmp->ncpus) - 2);
}
static void grlib_irqmp_realize(DeviceState *dev, Error **errp)
{
IRQMP *irqmp = GRLIB_IRQMP(dev);
if ((!irqmp->ncpus) || (irqmp->ncpus > IRQMP_MAX_CPU)) {
error_setg(errp, "Invalid ncpus properties: "
"%u, must be 0 < ncpus =< %u.", irqmp->ncpus,
IRQMP_MAX_CPU);
return;
}
qdev_init_gpio_in(dev, grlib_irqmp_set_irq, MAX_PILS);
/*
* Transitionning from 0 to 1 starts the CPUs. The opposite can't
* happen.
*/
qdev_init_gpio_out_named(dev, irqmp->start_signal, "grlib-start-cpu",
IRQMP_MAX_CPU);
qdev_init_gpio_out_named(dev, irqmp->irq, "grlib-irq", irqmp->ncpus);
memory_region_init_io(&irqmp->iomem, OBJECT(dev), &grlib_irqmp_ops, irqmp,
"irqmp", IRQMP_REG_SIZE);
irqmp->state = g_malloc0(sizeof *irqmp->state);
sysbus_init_mmio(SYS_BUS_DEVICE(dev), &irqmp->iomem);
}
static Property grlib_irqmp_properties[] = {
DEFINE_PROP_UINT32("ncpus", IRQMP, ncpus, 1),
DEFINE_PROP_END_OF_LIST(),
};
static void grlib_irqmp_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = grlib_irqmp_realize;
dc->reset = grlib_irqmp_reset;
device_class_set_props(dc, grlib_irqmp_properties);
}
static const TypeInfo grlib_irqmp_info = {
.name = TYPE_GRLIB_IRQMP,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(IRQMP),
.class_init = grlib_irqmp_class_init,
};
static void grlib_irqmp_register_types(void)
{
type_register_static(&grlib_irqmp_info);
}
type_init(grlib_irqmp_register_types)
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