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author | Marc Zyngier <marc.zyngier@arm.com> | 2016-12-20 15:27:52 +0000 |
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committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-08-31 15:31:40 +0100 |
commit | 7de5c0af9c7c717f9052e6d75b24f90050e6a56e (patch) | |
tree | 639a0920ecfe324c46cfa44d9e7fe64c3ee6d754 /drivers/irqchip | |
parent | d51c4b4da7f8fae8c884e3b89fdab906f66da28a (diff) | |
download | linux-stable-7de5c0af9c7c717f9052e6d75b24f90050e6a56e.tar.gz linux-stable-7de5c0af9c7c717f9052e6d75b24f90050e6a56e.tar.bz2 linux-stable-7de5c0af9c7c717f9052e6d75b24f90050e6a56e.zip |
irqchip/gic-v4: Add per-VM VPE domain creation
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>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r-- | drivers/irqchip/irq-gic-v4.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v4.c b/drivers/irqchip/irq-gic-v4.c new file mode 100644 index 000000000000..3d4bedea4e78 --- /dev/null +++ b/drivers/irqchip/irq-gic-v4.c @@ -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); +} |