75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
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/*
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* Copyright (C) 2016,2017 ARM Limited, All Rights Reserved.
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/msi.h>
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#include <linux/sched.h>
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#include <linux/irqchip/arm-gic-v4.h>
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static struct irq_domain *gic_domain;
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static const struct irq_domain_ops *vpe_domain_ops;
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int its_alloc_vcpu_irqs(struct its_vm *vm)
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{
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int vpe_base_irq, i;
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vm->fwnode = irq_domain_alloc_named_id_fwnode("GICv4-vpe",
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task_pid_nr(current));
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if (!vm->fwnode)
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goto err;
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vm->domain = irq_domain_create_hierarchy(gic_domain, 0, vm->nr_vpes,
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vm->fwnode, vpe_domain_ops,
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vm);
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if (!vm->domain)
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goto err;
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for (i = 0; i < vm->nr_vpes; i++) {
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vm->vpes[i]->its_vm = vm;
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vm->vpes[i]->idai = true;
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}
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vpe_base_irq = __irq_domain_alloc_irqs(vm->domain, -1, vm->nr_vpes,
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NUMA_NO_NODE, vm,
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false, NULL);
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if (vpe_base_irq <= 0)
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goto err;
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for (i = 0; i < vm->nr_vpes; i++)
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vm->vpes[i]->irq = vpe_base_irq + i;
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return 0;
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err:
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if (vm->domain)
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irq_domain_remove(vm->domain);
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if (vm->fwnode)
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irq_domain_free_fwnode(vm->fwnode);
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return -ENOMEM;
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}
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void its_free_vcpu_irqs(struct its_vm *vm)
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{
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irq_domain_free_irqs(vm->vpes[0]->irq, vm->nr_vpes);
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irq_domain_remove(vm->domain);
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irq_domain_free_fwnode(vm->fwnode);
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}
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