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irqchip/gic-v4: Add per-VM VPE domain creation

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When creating a VM, it is very convenient to have an irq domain
containing all the doorbell interrupts associated with that VM
(each interrupt representing a VPE).

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-12-20 15:27:52 +00:00
parent d51c4b4da7
commit 7de5c0af9c
2 changed files with 77 additions and 0 deletions
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74
drivers/irqchip/irq-gic-v4.c Normal file
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@ -0,0 +1,74 @@
/*
* 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);
}

3
include/linux/irqchip/arm-gic-v4.h
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@ -91,4 +91,7 @@ struct its_cmd_info {
};
};
int its_alloc_vcpu_irqs(struct its_vm *vm);
void its_free_vcpu_irqs(struct its_vm *vm);
#endif