linux-kernel - [PATCH 18/35] irqchip/gic-v4.1: Add VPE INVALL callback

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Message-Id: <20190923182606.32100-19-maz@kernel.org>
Date:   Mon, 23 Sep 2019 19:25:49 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Cc:     Eric Auger <eric.auger@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <Andrew.Murray@....com>
Subject: [PATCH 18/35] irqchip/gic-v4.1: Add VPE INVALL callback

GICv4.1 redistributors have a VPE-aware INVALL register. Progress!
We can now emulate a guest-requested INVALL without emiting a
VINVALL command.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/irq-gic-v3-its.c   | 14 ++++++++++++++
 include/linux/irqchip/arm-gic-v3.h |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 3079ce74def6..eda35e66237f 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3506,6 +3506,19 @@ static void its_vpe_4_1_deschedule(struct its_vpe *vpe,
 	}
 }
 
+static void its_vpe_4_1_invall(struct its_vpe *vpe)
+{
+	void __iomem *rdbase;
+	u64 val;
+
+	val  = GICR_INVLPIR_V;
+	val |= FIELD_PREP(GICR_INVLPIR_VPEID, vpe->vpe_id);
+
+	/* Target the redistributor this vPE is currently known on */
+	rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
+	gic_write_lpir(val, rdbase + GICR_INVALLR);
+}
+
 static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
 {
 	struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
@@ -3521,6 +3534,7 @@ static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
 		return 0;
 
 	case INVALL_VPE:
+		its_vpe_4_1_invall(vpe);
 		return 0;
 
 	default:
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 6fd89d77b2b2..b69f60792554 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -247,6 +247,9 @@
 #define GICR_TYPER_COMMON_LPI_AFF	GENMASK_ULL(25, 24)
 #define GICR_TYPER_AFFINITY		GENMASK_ULL(63, 32)
 
+#define GICR_INVLPIR_VPEID		GENMASK_ULL(47, 32)
+#define GICR_INVLPIR_V			GENMASK_ULL(63, 63)
+
 #define GIC_V3_REDIST_SIZE		0x20000
 
 #define LPI_PROP_GROUP1			(1 << 1)
-- 
2.20.1