linux-kernel - [PATCH v6 23/23] KVM: arm64: GICv4.1: Expose HW-based SGIs in debugfs

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Date:   Fri, 20 Mar 2020 18:24:06 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Eric Auger <eric.auger@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v6 23/23] KVM: arm64: GICv4.1: Expose HW-based SGIs in debugfs

The vgic-state debugfs file could do with showing the pending state
of the HW-backed SGIs. Plug it into the low-level code.

Signed-off-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>
Link: https://lore.kernel.org/r/20200304203330.4967-24-maz@kernel.org
---
 virt/kvm/arm/vgic/vgic-debug.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic-debug.c b/virt/kvm/arm/vgic/vgic-debug.c
index cc12fe9b2df3..b13a9e3f99dd 100644
--- a/virt/kvm/arm/vgic/vgic-debug.c
+++ b/virt/kvm/arm/vgic/vgic-debug.c
@@ -178,6 +178,8 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
 			    struct kvm_vcpu *vcpu)
 {
 	char *type;
+	bool pending;
+
 	if (irq->intid < VGIC_NR_SGIS)
 		type = "SGI";
 	else if (irq->intid < VGIC_NR_PRIVATE_IRQS)
@@ -190,6 +192,16 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
 	if (irq->intid ==0 || irq->intid == VGIC_NR_PRIVATE_IRQS)
 		print_header(s, irq, vcpu);
 
+	pending = irq->pending_latch;
+	if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+		int err;
+
+		err = irq_get_irqchip_state(irq->host_irq,
+					    IRQCHIP_STATE_PENDING,
+					    &pending);
+		WARN_ON_ONCE(err);
+	}
+
 	seq_printf(s, "       %s %4d "
 		      "    %2d "
 		      "%d%d%d%d%d%d%d "
@@ -201,7 +213,7 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
 		      "\n",
 			type, irq->intid,
 			(irq->target_vcpu) ? irq->target_vcpu->vcpu_id : -1,
-			irq->pending_latch,
+			pending,
 			irq->line_level,
 			irq->active,
 			irq->enabled,
-- 
2.20.1