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). Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> --- drivers/irqchip/irq-gic-v4.c | 111 +++++++++++++++++++++++++++++++++++++ include/linux/irqchip/arm-gic-v4.h | 3 + 2 files changed, 114 insertions(+) create mode 100644 drivers/irqchip/irq-gic-v4.c diff --git a/drivers/irqchip/irq-gic-v4.c b/drivers/irqchip/irq-gic-v4.c new file mode 100644 index 0000000..b9a0b34 --- /dev/null +++ b/drivers/irqchip/irq-gic-v4.c @@ -0,0 +1,111 @@ +/* + * Copyright (C) 2016 ARM Limited, All Rights Reserved. + * Author: Marc Zyngier <marc.zyngier@xxxxxxx> + * + * 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/irqchip/arm-gic-v4.h> + +static struct irq_domain *its_vpe_domain; + +static struct irq_chip its_vcpu_irq_chip = { + .name = "GICv4-vcpu", + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_eoi = irq_chip_eoi_parent, + .irq_set_affinity = irq_chip_set_affinity_parent, + .irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent, +}; + +static int its_vcpu_irq_domain_alloc(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs, void *args) +{ + msi_alloc_info_t info; + struct its_vpe **vpes = args; + int err, i; + + info.desc = NULL; + info.scratchpad[0].ptr = vpes; + + /* Allocate LPIs at the redistributor level */ + err = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &info); + if (err) + return err; + + for (i = 0; i < nr_irqs; i++) { + irq_domain_set_hwirq_and_chip(domain, virq + i, i, + &its_vcpu_irq_chip, vpes[i]); + } + + return 0; +} + +static void its_vcpu_irq_domain_free(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs) +{ + int i; + + for (i = 0; i < nr_irqs; i++) { + struct irq_data *data = irq_domain_get_irq_data(domain, + virq + i); + + irq_domain_reset_irq_data(data); + } + + irq_domain_free_irqs_parent(domain, virq, nr_irqs); +} + +static const struct irq_domain_ops vcpu_domain_ops = { + .alloc = its_vcpu_irq_domain_alloc, + .free = its_vcpu_irq_domain_free, +}; + +int its_alloc_vcpu_irqs(struct its_vm *vm, struct its_vpe **vpes, int nr_vpes) +{ + int vpe_base_irq, i; + + vm->domain = irq_domain_create_hierarchy(its_vpe_domain, 0, nr_vpes, + NULL, &vcpu_domain_ops, + vpes); + if (!vm->domain) + return -ENOMEM; + + for (i = 0; i < nr_vpes; i++) { + vpes[i]->its_vm = vm; + vpes[i]->idai = true; + } + + vpe_base_irq = __irq_domain_alloc_irqs(vm->domain, -1, nr_vpes, + NUMA_NO_NODE, vpes, + false, NULL); + return vpe_base_irq; +} + +void its_free_vcpu_irqs(struct its_vm *vm, int nr_vpes) +{ + unsigned int irq; + + irq = irq_find_mapping(vm->domain, 0); + if (!irq) + return; + + irq_domain_free_irqs(irq, nr_vpes); +} diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h index 6e9c2b3..2463d70 100644 --- a/include/linux/irqchip/arm-gic-v4.h +++ b/include/linux/irqchip/arm-gic-v4.h @@ -89,4 +89,7 @@ struct its_cmd_info { }; }; +int its_alloc_vcpu_irqs(struct its_vm *vm, struct its_vpe **vpes, int nr_vpes); +void its_free_vcpu_irqs(struct its_vm *vm, int nr_vpes); + #endif -- 2.1.4 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
