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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/irqchip/irq-gic-v4.c
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@@ -1,18 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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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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6
 
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 #include <linux/interrupt.h>
..
..
@@ -96,6 +85,53 @@
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85
 
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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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+static const struct irq_domain_ops *sgi_domain_ops;
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+
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+static bool has_v4_1(void)
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+{
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+	return !!sgi_domain_ops;
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+}
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+
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+static int its_alloc_vcpu_sgis(struct its_vpe *vpe, int idx)
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+{
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+	char *name;
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+	int sgi_base;
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+
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+	if (!has_v4_1())
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+		return 0;
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+
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+	name = kasprintf(GFP_KERNEL, "GICv4-sgi-%d", task_pid_nr(current));
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+	if (!name)
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+		goto err;
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+
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+	vpe->fwnode = irq_domain_alloc_named_id_fwnode(name, idx);
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+	if (!vpe->fwnode)
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+		goto err;
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+
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+	kfree(name);
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+	name = NULL;
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+
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+	vpe->sgi_domain = irq_domain_create_linear(vpe->fwnode, 16,
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+						   sgi_domain_ops, vpe);
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+	if (!vpe->sgi_domain)
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+		goto err;
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+
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+	sgi_base = __irq_domain_alloc_irqs(vpe->sgi_domain, -1, 16,
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+					       NUMA_NO_NODE, vpe,
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+					       false, NULL);
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+	if (sgi_base <= 0)
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+		goto err;
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+
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+	return 0;
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+
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+err:
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+	if (vpe->sgi_domain)
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+		irq_domain_remove(vpe->sgi_domain);
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+	if (vpe->fwnode)
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+		irq_domain_free_fwnode(vpe->fwnode);
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+	kfree(name);
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+	return -ENOMEM;
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+}
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 int its_alloc_vcpu_irqs(struct its_vm *vm)
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 {
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@@ -123,8 +159,13 @@
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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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+	for (i = 0; i < vm->nr_vpes; i++) {
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+		int ret;
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 		vm->vpes[i]->irq = vpe_base_irq + i;
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+		ret = its_alloc_vcpu_sgis(vm->vpes[i], i);
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+		if (ret)
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+			goto err;
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+	}
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 	return 0;
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..
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@@ -137,8 +178,28 @@
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 	return -ENOMEM;
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 }
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180
 
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+static void its_free_sgi_irqs(struct its_vm *vm)
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+{
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+	int i;
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+
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+	if (!has_v4_1())
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+		return;
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+
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+	for (i = 0; i < vm->nr_vpes; i++) {
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+		unsigned int irq = irq_find_mapping(vm->vpes[i]->sgi_domain, 0);
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+
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+		if (WARN_ON(!irq))
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+			continue;
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+
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+		irq_domain_free_irqs(irq, 16);
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+		irq_domain_remove(vm->vpes[i]->sgi_domain);
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+		irq_domain_free_fwnode(vm->vpes[i]->fwnode);
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+	}
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+}
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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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+	its_free_sgi_irqs(vm);
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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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@@ -149,16 +210,72 @@
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 	return irq_set_vcpu_affinity(vpe->irq, info);
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 }
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-int its_schedule_vpe(struct its_vpe *vpe, bool on)
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+int its_make_vpe_non_resident(struct its_vpe *vpe, bool db)
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 {
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-	struct its_cmd_info info;
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+	struct irq_desc *desc = irq_to_desc(vpe->irq);
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+	struct its_cmd_info info = { };
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+	int ret;
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 	WARN_ON(preemptible());
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-	info.cmd_type = on ? SCHEDULE_VPE : DESCHEDULE_VPE;
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+	info.cmd_type = DESCHEDULE_VPE;
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+	if (has_v4_1()) {
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+		/* GICv4.1 can directly deal with doorbells */
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+		info.req_db = db;
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+	} else {
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+		/* Undo the nested disable_irq() calls... */
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+		while (db && irqd_irq_disabled(&desc->irq_data))
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+			enable_irq(vpe->irq);
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+	}
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-	return its_send_vpe_cmd(vpe, &info);
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+	ret = its_send_vpe_cmd(vpe, &info);
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+	if (!ret)
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+		vpe->resident = false;
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+
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+	vpe->ready = false;
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+
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+	return ret;
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 }
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+
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+int its_make_vpe_resident(struct its_vpe *vpe, bool g0en, bool g1en)
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+{
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+	struct its_cmd_info info = { };
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+	int ret;
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+
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+	WARN_ON(preemptible());
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+
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+	info.cmd_type = SCHEDULE_VPE;
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+	if (has_v4_1()) {
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+		info.g0en = g0en;
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+		info.g1en = g1en;
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+	} else {
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+		/* Disabled the doorbell, as we're about to enter the guest */
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+		disable_irq_nosync(vpe->irq);
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+	}
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+
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+	ret = its_send_vpe_cmd(vpe, &info);
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+	if (!ret)
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+		vpe->resident = true;
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+
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+	return ret;
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+}
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+
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+int its_commit_vpe(struct its_vpe *vpe)
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+{
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+	struct its_cmd_info info = {
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+		.cmd_type = COMMIT_VPE,
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+	};
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+	int ret;
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+
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+	WARN_ON(preemptible());
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+
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+	ret = its_send_vpe_cmd(vpe, &info);
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+	if (!ret)
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+		vpe->ready = true;
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+
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+	return ret;
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+}
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+
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 int its_invall_vpe(struct its_vpe *vpe)
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 {
..
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@@ -222,12 +339,28 @@
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 	return irq_set_vcpu_affinity(irq, &info);
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 }
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-int its_init_v4(struct irq_domain *domain, const struct irq_domain_ops *ops)
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+int its_prop_update_vsgi(int irq, u8 priority, bool group)
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+{
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+	struct its_cmd_info info = {
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+		.cmd_type = PROP_UPDATE_VSGI,
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+		{
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+			.priority	= priority,
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+			.group		= group,
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+		},
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+	};
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+
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+	return irq_set_vcpu_affinity(irq, &info);
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+}
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+
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+int its_init_v4(struct irq_domain *domain,
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+		const struct irq_domain_ops *vpe_ops,
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+		const struct irq_domain_ops *sgi_ops)
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 {
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 	if (domain) {
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 		pr_info("ITS: Enabling GICv4 support\n");
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 		gic_domain = domain;
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-		vpe_domain_ops = ops;
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+		vpe_domain_ops = vpe_ops;
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+		sgi_domain_ops = sgi_ops;
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 		return 0;
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 	}
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