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/*
* Copyright (C) 2016,2017 ARM Limited, All Rights Reserved.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/sched.h>
#include <linux/irqchip/arm-gic-v4.h>
static struct irq_domain *gic_domain;
static const struct irq_domain_ops *vpe_domain_ops;
int its_alloc_vcpu_irqs(struct its_vm *vm)
{
int vpe_base_irq, i;
vm->fwnode = irq_domain_alloc_named_id_fwnode("GICv4-vpe",
task_pid_nr(current));
if (!vm->fwnode)
goto err;
vm->domain = irq_domain_create_hierarchy(gic_domain, 0, vm->nr_vpes,
vm->fwnode, vpe_domain_ops,
vm);
if (!vm->domain)
goto err;
for (i = 0; i < vm->nr_vpes; i++) {
vm->vpes[i]->its_vm = vm;
vm->vpes[i]->idai = true;
}
vpe_base_irq = __irq_domain_alloc_irqs(vm->domain, -1, vm->nr_vpes,
NUMA_NO_NODE, vm,
false, NULL);
if (vpe_base_irq <= 0)
goto err;
for (i = 0; i < vm->nr_vpes; i++)
vm->vpes[i]->irq = vpe_base_irq + i;
return 0;
err:
if (vm->domain)
irq_domain_remove(vm->domain);
if (vm->fwnode)
irq_domain_free_fwnode(vm->fwnode);
return -ENOMEM;
}
void its_free_vcpu_irqs(struct its_vm *vm)
{
irq_domain_free_irqs(vm->vpes[0]->irq, vm->nr_vpes);
irq_domain_remove(vm->domain);
irq_domain_free_fwnode(vm->fwnode);
}
static int its_send_vpe_cmd(struct its_vpe *vpe, struct its_cmd_info *info)
{
return irq_set_vcpu_affinity(vpe->irq, info);
}
int its_schedule_vpe(struct its_vpe *vpe, bool on)
{
struct its_cmd_info info;
WARN_ON(preemptible());
info.cmd_type = on ? SCHEDULE_VPE : DESCHEDULE_VPE;
return its_send_vpe_cmd(vpe, &info);
}
int its_invall_vpe(struct its_vpe *vpe)
{
struct its_cmd_info info = {
.cmd_type = INVALL_VPE,
};
return its_send_vpe_cmd(vpe, &info);
}
int its_map_vlpi(int irq, struct its_vlpi_map *map)
{
struct its_cmd_info info = {
.cmd_type = MAP_VLPI,
.map = map,
};
/*
* The host will never see that interrupt firing again, so it
* is vital that we don't do any lazy masking.
*/
irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY);
return irq_set_vcpu_affinity(irq, &info);
}
int its_get_vlpi(int irq, struct its_vlpi_map *map)
{
struct its_cmd_info info = {
.cmd_type = GET_VLPI,
.map = map,
};
return irq_set_vcpu_affinity(irq, &info);
}
int its_unmap_vlpi(int irq)
{
irq_clear_status_flags(irq, IRQ_DISABLE_UNLAZY);
return irq_set_vcpu_affinity(irq, NULL);
}
int its_prop_update_vlpi(int irq, u8 config, bool inv)
{
struct its_cmd_info info = {
.cmd_type = inv ? PROP_UPDATE_AND_INV_VLPI : PROP_UPDATE_VLPI,
.config = config,
};
return irq_set_vcpu_affinity(irq, &info);
}
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