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

/*

 * 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);

}

	};

};

int its_alloc_vcpu_irqs(struct its_vm *vm);

void its_free_vcpu_irqs(struct its_vm *vm);

#endif