Message-Id: <1457436573-6180-9-git-send-email-julien.grall@arm.com>
Date:	Tue,  8 Mar 2016 11:29:32 +0000
From:	Julien Grall <julien.grall@....com>
To:	kvmarm@...ts.cs.columbia.edu
Cc:	christoffer.dall@...aro.org, marc.zyngier@....com,
	fu.wei@...aro.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	wei@...hat.com, al.stone@...aro.org,
	Julien Grall <julien.grall@....com>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH v3 8/9] KVM: arm/arm64: vgic: Rely on the GIC driver to parse the firmware tables

Currenlty, the firmware tables are parsed 2 times: once in the GIC
drivers, the other time when initializing the vGIC. It means code
duplication and make more tedious to add the support for another
firmware table (like ACPI).

Use the recently introduced helper gic_get_kvm_info() to get
information about the virtual GIC.

With this change, the virtual GIC becomes agnostic to the firmware
table and KVM will be able to initialize the vGIC on ACPI.

Signed-off-by: Julien Grall <julien.grall@....com>

---
Cc: Christoffer Dall <christoffer.dall@...aro.org>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Gleb Natapov <gleb@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>

    Changes in v2:
        - Use 0 rather than a negative value to know when the maintenance IRQ
        is not present.
        - Use resource for vcpu and vctrl
---
 include/kvm/arm_vgic.h |  7 +++---
 virt/kvm/arm/vgic-v2.c | 67 ++++++++++++++++++--------------------------------
 virt/kvm/arm/vgic-v3.c | 45 ++++++++++-----------------------
 virt/kvm/arm/vgic.c    | 50 ++++++++++++++++++++-----------------
 4 files changed, 68 insertions(+), 101 deletions(-)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 13a3d53..ed62772 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -25,6 +25,7 @@
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <kvm/iodev.h>
+#include <linux/irqchip/arm-gic-common.h>
 
 #define VGIC_NR_IRQS_LEGACY	256
 #define VGIC_NR_SGIS		16
@@ -357,15 +358,15 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, struct irq_phys_map *map);
 #define vgic_initialized(k)	(!!((k)->arch.vgic.nr_cpus))
 #define vgic_ready(k)		((k)->arch.vgic.ready)
 
-int vgic_v2_probe(struct device_node *vgic_node,
+int vgic_v2_probe(const struct gic_kvm_info *gic_kvm_info,
 		  const struct vgic_ops **ops,
 		  const struct vgic_params **params);
 #ifdef CONFIG_KVM_ARM_VGIC_V3
-int vgic_v3_probe(struct device_node *vgic_node,
+int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
 		  const struct vgic_ops **ops,
 		  const struct vgic_params **params);
 #else
-static inline int vgic_v3_probe(struct device_node *vgic_node,
+static inline int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
 				const struct vgic_ops **ops,
 				const struct vgic_params **params)
 {
diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c
index ff02f08..3598cd4 100644
--- a/virt/kvm/arm/vgic-v2.c
+++ b/virt/kvm/arm/vgic-v2.c
@@ -20,9 +20,6 @@
 #include <linux/kvm_host.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
 
 #include <linux/irqchip/arm-gic.h>
 
@@ -177,38 +174,38 @@ static const struct vgic_ops vgic_v2_ops = {
 static struct vgic_params vgic_v2_params;
 
 /**
- * vgic_v2_probe - probe for a GICv2 compatible interrupt controller in DT
- * @node:	pointer to the DT node
- * @ops: 	address of a pointer to the GICv2 operations
- * @params:	address of a pointer to HW-specific parameters
+ * vgic_v2_probe - probe for a GICv2 compatible interrupt controller
+ * @gic_kvm_info:	pointer to the GIC description
+ * @ops:		address of a pointer to the GICv2 operations
+ * @params:		address of a pointer to HW-specific parameters
  *
  * Returns 0 if a GICv2 has been found, with the low level operations
  * in *ops and the HW parameters in *params. Returns an error code
  * otherwise.
  */
-int vgic_v2_probe(struct device_node *vgic_node,
-		  const struct vgic_ops **ops,
-		  const struct vgic_params **params)
+int vgic_v2_probe(const struct gic_kvm_info *gic_kvm_info,
+		   const struct vgic_ops **ops,
+		   const struct vgic_params **params)
 {
 	int ret;
-	struct resource vctrl_res;
-	struct resource vcpu_res;
 	struct vgic_params *vgic = &vgic_v2_params;
+	resource_size_t vctrl_size = resource_size(&gic_kvm_info->vctrl);
 
-	vgic->maint_irq = irq_of_parse_and_map(vgic_node, 0);
-	if (!vgic->maint_irq) {
-		kvm_err("error getting vgic maintenance irq from DT\n");
+	if (!gic_kvm_info->maint_irq) {
+		kvm_err("error getting vgic maintenance irq\n");
 		ret = -ENXIO;
 		goto out;
 	}
+	vgic->maint_irq = gic_kvm_info->maint_irq;
 
-	ret = of_address_to_resource(vgic_node, 2, &vctrl_res);
-	if (ret) {
-		kvm_err("Cannot obtain GICH resource\n");
+	if (!gic_kvm_info->vctrl.start) {
+		kvm_err("GICH not present in the firmware table\n");
+		ret = -ENXIO;
 		goto out;
 	}
 
-	vgic->vctrl_base = of_iomap(vgic_node, 2);
+	vgic->vctrl_base = ioremap(gic_kvm_info->vctrl.start,
+				   resource_size(&gic_kvm_info->vctrl));
 	if (!vgic->vctrl_base) {
 		kvm_err("Cannot ioremap GICH\n");
 		ret = -ENOMEM;
@@ -219,30 +216,15 @@ int vgic_v2_probe(struct device_node *vgic_node,
 	vgic->nr_lr = (vgic->nr_lr & 0x3f) + 1;
 
 	ret = create_hyp_io_mappings(vgic->vctrl_base,
-				     vgic->vctrl_base + resource_size(&vctrl_res),
-				     vctrl_res.start);
+				     vgic->vctrl_base + vctrl_size,
+				     gic_kvm_info->vctrl.start);
 	if (ret) {
-		kvm_err("Cannot map VCTRL into hyp\n");
-		goto out_unmap;
-	}
-
-	if (of_address_to_resource(vgic_node, 3, &vcpu_res)) {
-		kvm_err("Cannot obtain GICV resource\n");
-		ret = -ENXIO;
-		goto out_unmap;
-	}
-
-	if (!PAGE_ALIGNED(vcpu_res.start)) {
-		kvm_err("GICV physical address 0x%llx not page aligned\n",
-			(unsigned long long)vcpu_res.start);
-		ret = -ENXIO;
+		kvm_err("Cannot map VCTLR into hyp\n");
 		goto out_unmap;
 	}
 
-	if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
-		kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n",
-			(unsigned long long)resource_size(&vcpu_res),
-			PAGE_SIZE);
+	if (!gic_kvm_info->vcpu.start) {
+		kvm_err("GICV not present in the firmware table\n");
 		ret = -ENXIO;
 		goto out_unmap;
 	}
@@ -250,10 +232,10 @@ int vgic_v2_probe(struct device_node *vgic_node,
 	vgic->can_emulate_gicv2 = true;
 	kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2);
 
-	vgic->vcpu_base = vcpu_res.start;
+	vgic->vcpu_base = gic_kvm_info->vcpu.start;
 
-	kvm_info("%s@...x IRQ%d\n", vgic_node->name,
-		 vctrl_res.start, vgic->maint_irq);
+	kvm_info("GICH base=0x%llx, GICV base=0x%llx, IRQ=%d\n",
+		 gic_kvm_info->vctrl.start, vgic->vcpu_base, vgic->maint_irq);
 
 	vgic->type = VGIC_V2;
 	vgic->max_gic_vcpus = VGIC_V2_MAX_CPUS;
@@ -264,6 +246,5 @@ int vgic_v2_probe(struct device_node *vgic_node,
 out_unmap:
 	iounmap(vgic->vctrl_base);
 out:
-	of_node_put(vgic_node);
 	return ret;
 }
diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c
index 453eafd..92c1f04 100644
--- a/virt/kvm/arm/vgic-v3.c
+++ b/virt/kvm/arm/vgic-v3.c
@@ -20,11 +20,9 @@
 #include <linux/kvm_host.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
 
 #include <linux/irqchip/arm-gic-v3.h>
+#include <linux/irqchip/arm-gic-common.h>
 
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_arm.h>
@@ -217,30 +215,28 @@ static const struct vgic_ops vgic_v3_ops = {
 static struct vgic_params vgic_v3_params;
 
 /**
- * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT
- * @node:	pointer to the DT node
- * @ops: 	address of a pointer to the GICv3 operations
- * @params:	address of a pointer to HW-specific parameters
+ * vgic_v3_probe - probe for a GICv3 compatible interrupt controller
+ * @gic_kvm_info:	pointer to the GIC description
+ * @ops:		address of a pointer to the GICv3 operations
+ * @params:		address of a pointer to HW-specific parameters
  *
  * Returns 0 if a GICv3 has been found, with the low level operations
  * in *ops and the HW parameters in *params. Returns an error code
  * otherwise.
  */
-int vgic_v3_probe(struct device_node *vgic_node,
+int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
 		  const struct vgic_ops **ops,
 		  const struct vgic_params **params)
 {
 	int ret = 0;
-	u32 gicv_idx;
-	struct resource vcpu_res;
 	struct vgic_params *vgic = &vgic_v3_params;
 
-	vgic->maint_irq = irq_of_parse_and_map(vgic_node, 0);
-	if (!vgic->maint_irq) {
-		kvm_err("error getting vgic maintenance irq from DT\n");
+	if (!gic_kvm_info->maint_irq) {
+		kvm_err("error getting vgic maintenance irq\n");
 		ret = -ENXIO;
 		goto out;
 	}
+	vgic->maint_irq = gic_kvm_info->maint_irq;
 
 	ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);
 
@@ -251,24 +247,11 @@ int vgic_v3_probe(struct device_node *vgic_node,
 	vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1;
 	vgic->can_emulate_gicv2 = false;
 
-	if (of_property_read_u32(vgic_node, "#redistributor-regions", &gicv_idx))
-		gicv_idx = 1;
-
-	gicv_idx += 3; /* Also skip GICD, GICC, GICH */
-	if (of_address_to_resource(vgic_node, gicv_idx, &vcpu_res)) {
+	if (!gic_kvm_info->vcpu.start) {
 		kvm_info("GICv3: no GICV resource entry\n");
 		vgic->vcpu_base = 0;
-	} else if (!PAGE_ALIGNED(vcpu_res.start)) {
-		pr_warn("GICV physical address 0x%llx not page aligned\n",
-			(unsigned long long)vcpu_res.start);
-		vgic->vcpu_base = 0;
-	} else if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
-		pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n",
-			(unsigned long long)resource_size(&vcpu_res),
-			PAGE_SIZE);
-		vgic->vcpu_base = 0;
 	} else {
-		vgic->vcpu_base = vcpu_res.start;
+		vgic->vcpu_base = gic_kvm_info->vcpu.start;
 		vgic->can_emulate_gicv2 = true;
 		kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
 					KVM_DEV_TYPE_ARM_VGIC_V2);
@@ -281,13 +264,11 @@ int vgic_v3_probe(struct device_node *vgic_node,
 	vgic->type = VGIC_V3;
 	vgic->max_gic_vcpus = VGIC_V3_MAX_CPUS;
 
-	kvm_info("%s@...x IRQ%d\n", vgic_node->name,
-		 vcpu_res.start, vgic->maint_irq);
-
+	kvm_info("GICV base=0x%llx, IRQ=%d\n",
+		 vgic->vcpu_base, vgic->maint_irq);
 	*ops = &vgic_v3_ops;
 	*params = vgic;
 
 out:
-	of_node_put(vgic_node);
 	return ret;
 }
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 00429b3..60668a7 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -21,9 +21,7 @@
 #include <linux/kvm_host.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
+#include <linux/irq.h>
 #include <linux/rculist.h>
 #include <linux/uaccess.h>
 
@@ -33,6 +31,7 @@
 #include <trace/events/kvm.h>
 #include <asm/kvm.h>
 #include <kvm/iodev.h>
+#include <linux/irqchip/arm-gic-common.h>
 
 #define CREATE_TRACE_POINTS
 #include "trace.h"
@@ -2389,33 +2388,38 @@ static struct notifier_block vgic_cpu_nb = {
 	.notifier_call = vgic_cpu_notify,
 };
 
-static const struct of_device_id vgic_ids[] = {
-	{ .compatible = "arm,cortex-a15-gic",	.data = vgic_v2_probe, },
-	{ .compatible = "arm,cortex-a7-gic",	.data = vgic_v2_probe, },
-	{ .compatible = "arm,gic-400",		.data = vgic_v2_probe, },
-	{ .compatible = "arm,gic-v3",		.data = vgic_v3_probe, },
-	{},
-};
-
-int kvm_vgic_hyp_init(void)
+static int kvm_vgic_probe(void)
 {
-	const struct of_device_id *matched_id;
-	const int (*vgic_probe)(struct device_node *,const struct vgic_ops **,
-				const struct vgic_params **);
-	struct device_node *vgic_node;
+	const struct gic_kvm_info *gic_kvm_info;
 	int ret;
 
-	vgic_node = of_find_matching_node_and_match(NULL,
-						    vgic_ids, &matched_id);
-	if (!vgic_node) {
-		kvm_err("error: no compatible GIC node found\n");
+	gic_kvm_info = gic_get_kvm_info();
+	if (!gic_kvm_info)
 		return -ENODEV;
+
+	switch (gic_kvm_info->type) {
+	case GIC_V2:
+		ret = vgic_v2_probe(gic_kvm_info, &vgic_ops, &vgic);
+		break;
+	case GIC_V3:
+		ret = vgic_v3_probe(gic_kvm_info, &vgic_ops, &vgic);
+		break;
+	default:
+		ret = -ENODEV;
 	}
 
-	vgic_probe = matched_id->data;
-	ret = vgic_probe(vgic_node, &vgic_ops, &vgic);
-	if (ret)
+	return ret;
+}
+
+int kvm_vgic_hyp_init(void)
+{
+	int ret;
+
+	ret = kvm_vgic_probe();
+	if (ret) {
+		kvm_err("error: KVM vGIC probing failed\n");
 		return ret;
+	}
 
 	ret = request_percpu_irq(vgic->maint_irq, vgic_maintenance_handler,
 				 "vgic", kvm_get_running_vcpus());
-- 
1.9.1

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