Commit-ID: 7de5c0af9c7c717f9052e6d75b24f90050e6a56e
Gitweb: http://git.kernel.org/tip/7de5c0af9c7c717f9052e6d75b24f90050e6a56e
Author: Marc Zyngier <marc.zyngier@xxxxxxx>
AuthorDate: Tue, 20 Dec 2016 15:27:52 +0000
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Thu, 31 Aug 2017 15:31:40 +0100
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@xxxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/irqchip/irq-gic-v4.c | 74 ++++++++++++++++++++++++++++++++++++++
include/linux/irqchip/arm-gic-v4.h | 3 ++
2 files changed, 77 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v4.c b/drivers/irqchip/irq-gic-v4.c
new file mode 100644
index 0000000..3d4bede
--- /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@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/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);
+}
diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h
index e7a93ad..3dc811d 100644
--- a/include/linux/irqchip/arm-gic-v4.h
+++ b/include/linux/irqchip/arm-gic-v4.h
@@ -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
--
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