linux-kernel - [PATCH v3 11/32] irqchip/gic-v4.1: Add VPE residency callback

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Date:   Tue, 24 Dec 2019 11:10:34 +0000
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>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Robert Richter <rrichter@...vell.com>
Subject: [PATCH v3 11/32] irqchip/gic-v4.1: Add VPE residency callback

Making a VPE resident on GICv4.1 is pretty simple, as it is just a
single write to the local redistributor. We just need extra information
about which groups to enable, which the KVM code will have to provide.

Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/irq-gic-v3-its.c   | 17 +++++++++++++++++
 include/linux/irqchip/arm-gic-v3.h |  9 +++++++++
 include/linux/irqchip/arm-gic-v4.h |  5 +++++
 3 files changed, 31 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0da6baa48153..49850297fe56 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3625,12 +3625,29 @@ static void its_vpe_4_1_unmask_irq(struct irq_data *d)
 	its_vpe_4_1_send_inv(d);
 }
 
+static void its_vpe_4_1_schedule(struct its_vpe *vpe,
+				 struct its_cmd_info *info)
+{
+	void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
+	u64 val = 0;
+
+	/* Schedule the VPE */
+	val |= GICR_VPENDBASER_Valid;
+	val |= info->g0en ? GICR_VPENDBASER_4_1_VGRP0EN : 0;
+	val |= info->g1en ? GICR_VPENDBASER_4_1_VGRP1EN : 0;
+	val |= FIELD_PREP(GICR_VPENDBASER_4_1_VPEID, vpe->vpe_id);
+
+	gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
+}
+
 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);
 	struct its_cmd_info *info = vcpu_info;
 
 	switch (info->cmd_type) {
 	case SCHEDULE_VPE:
+		its_vpe_4_1_schedule(vpe, info);
 		return 0;
 
 	case DESCHEDULE_VPE:
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 33519b7c96cf..1c91dede7663 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -329,6 +329,15 @@
 #define GICR_VPENDBASER_IDAI		(1ULL << 62)
 #define GICR_VPENDBASER_Valid		(1ULL << 63)
 
+/*
+ * GICv4.1 VPENDBASER, used for VPE residency. On top of these fields,
+ * also use the above Valid, PendingLast and Dirty.
+ */
+#define GICR_VPENDBASER_4_1_DB		(1ULL << 62)
+#define GICR_VPENDBASER_4_1_VGRP0EN	(1ULL << 59)
+#define GICR_VPENDBASER_4_1_VGRP1EN	(1ULL << 58)
+#define GICR_VPENDBASER_4_1_VPEID	GENMASK_ULL(15, 0)
+
 /*
  * ITS registers, offsets from ITS_base
  */
diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h
index 498e523085a7..d9c34968467a 100644
--- a/include/linux/irqchip/arm-gic-v4.h
+++ b/include/linux/irqchip/arm-gic-v4.h
@@ -100,6 +100,11 @@ struct its_cmd_info {
 	union {
 		struct its_vlpi_map	*map;
 		u8			config;
+		bool			req_db;
+		struct {
+			bool		g0en;
+			bool		g1en;
+		};
 	};
 };
 
-- 
2.20.1