linux-kernel - [RFC PATCH 30/33] irqchip/gic-v4: Add VPE command interface

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Date:   Tue, 17 Jan 2017 10:20:51 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu
Cc:     Christoffer Dall <christoffer.dall@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Eric Auger <eric.auger@...hat.com>
Subject: [RFC PATCH 30/33] irqchip/gic-v4: Add VPE command interface

Add the required interfaces to schedule a VPE and perform a
VINVALL command.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 drivers/irqchip/irq-gic-v4.c       | 31 +++++++++++++++++++++++++++++++
 include/linux/irqchip/arm-gic-v4.h |  2 ++
 2 files changed, 33 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v4.c b/drivers/irqchip/irq-gic-v4.c
index b9a0b34..7d74089 100644
--- a/drivers/irqchip/irq-gic-v4.c
+++ b/drivers/irqchip/irq-gic-v4.c
@@ -109,3 +109,34 @@ void its_free_vcpu_irqs(struct its_vm *vm, int nr_vpes)
 
 	irq_domain_free_irqs(irq, nr_vpes);
 }
+
+static int its_send_vpe_cmd(struct its_vpe *vpe, struct its_cmd_info *info)
+{
+	unsigned int irq;
+	irq_hw_number_t hwirq;
+
+	WARN_ON(preemptible());
+
+	hwirq = vpe->vpe_db_lpi - vpe->its_vm->db_lpi_base;
+	irq = irq_find_mapping(vpe->its_vm->domain, hwirq);
+
+	return irq_set_vcpu_affinity(irq, info);
+}
+
+int its_schedule_vpe(struct its_vpe *vpe, bool on)
+{
+	struct its_cmd_info info;
+
+	info.cmd_type = on ? SCHEDULE_VPE : DESCHEDULE_VPE;
+
+	return its_send_vpe_cmd(vpe, &info);
+}
+
+int its_invall_vpe(struct its_vpe *vpe)
+{
+	struct its_cmd_info info = {
+		.cmd_type = INVALL_VPE,
+	};
+
+	return its_send_vpe_cmd(vpe, &info);
+}
diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h
index 2463d70..1c58add 100644
--- a/include/linux/irqchip/arm-gic-v4.h
+++ b/include/linux/irqchip/arm-gic-v4.h
@@ -91,5 +91,7 @@ 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);
+int its_schedule_vpe(struct its_vpe *vpe, bool on);
+int its_invall_vpe(struct its_vpe *vpe);
 
 #endif
-- 
2.1.4