[PATCH v3 6/9] irqchip/gic-v3: Parse and export virtual GIC information

Julien Grall
2016-03-08T11:31:00Z

Fill up the recently introduced gic_kvm_info with the virtual GIC
information.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>

---
Changes in v3:
- Add ACPI support

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
---
drivers/irqchip/irq-gic-v3.c | 85 +++++++++++++++++++++++++++++++++-
include/linux/irqchip/arm-gic-common.h | 1 +
2 files changed, 85 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 50e87e6..6ae25120 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -28,6 +28,7 @@
#include <linux/slab.h>

#include <linux/irqchip.h>
+#include <linux/irqchip/arm-gic-common.h>
#include <linux/irqchip/arm-gic-v3.h>

#include <asm/cputype.h>
@@ -56,6 +57,8 @@ struct gic_chip_data {
static struct gic_chip_data gic_data __read_mostly;
static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;

+static struct gic_kvm_info gic_v3_kvm_info;
+
#define gic_data_rdist() (this_cpu_ptr(gic_data.rdists.rdist))
#define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
#define gic_data_rdist_sgi_base() (gic_data_rdist_rd_base() + SZ_64K)
@@ -901,6 +904,37 @@ static int __init gic_validate_dist_version(void __iomem *dist_base)
return 0;
}

+static void __init gic_of_setup_kvm_info(struct device_node *node)
+{
+ int ret;
+ struct resource r;
+ u32 gicv_idx;
+
+ gic_v3_kvm_info.type = GIC_V3;
+
+ gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
+
+ if (of_property_read_u32(node, "#redistributor-regions",
+ &gicv_idx))
+ gicv_idx = 1;
+
+ gicv_idx += 3; /* Also skip GICD, GICC, GICH */
+ ret = of_address_to_resource(node, gicv_idx, &r);
+ if (!ret) {
+ if (!PAGE_ALIGNED(r.start))
+ pr_warn("GICV physical address 0x%llx not page aligned\n",
+ (unsigned long long)r.start);
+ else if (!PAGE_ALIGNED(resource_size(&r)))
+ pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n",
+ (unsigned long long)resource_size(&r),
+ PAGE_SIZE);
+ else
+ gic_v3_kvm_info.vcpu = r;
+ }
+
+ gic_set_kvm_info(&gic_v3_kvm_info);
+}
+
static int __init gic_of_init(struct device_node *node, struct device_node *parent)
{
void __iomem *dist_base;
@@ -952,8 +986,10 @@ static int __init gic_of_init(struct device_node *node, struct device_node *pare

err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
redist_stride, &node->fwnode);
- if (!err)
+ if (!err) {
+ gic_of_setup_kvm_info(node);
return 0;
+ }

out_unmap_rdist:
for (i = 0; i < nr_redist_regions; i++)
@@ -974,6 +1010,10 @@ static struct
struct redist_region *redist_regs;
u32 nr_redist_regions;
bool single_redist;
+ u32 maint_irq;
+ int maint_irq_mode;
+ phys_addr_t vctrl_base;
+ phys_addr_t vcpu_base;
} acpi_data __initdata;

static void __init
@@ -1020,6 +1060,13 @@ gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header,
return -ENOMEM;

gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
+
+ acpi_data.maint_irq = gicc->vgic_interrupt;
+ acpi_data.maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
+ ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
+ acpi_data.vctrl_base = gicc->gich_base_address;
+ acpi_data.vcpu_base = gicc->gicv_base_address;
+
return 0;
}

@@ -1111,6 +1158,40 @@ static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
}

#define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
+#define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K)
+#define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K)
+
+static void __init gic_acpi_setup_kvm_info(void)
+{
+ int irq;
+
+ gic_v3_kvm_info.type = GIC_V3;
+
+ irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
+ acpi_data.maint_irq_mode,
+ ACPI_ACTIVE_HIGH);
+ if (irq > 0)
+ gic_v3_kvm_info.maint_irq = irq;
+
+ if (acpi_data.vctrl_base) {
+ struct resource *vctrl = &gic_v3_kvm_info.vctrl;
+
+ vctrl->flags = IORESOURCE_MEM;
+ vctrl->start = acpi_data.vctrl_base;
+ vctrl->end = vctrl->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1;
+ }
+
+ if (acpi_data.vcpu_base) {
+ struct resource *vcpu = &gic_v3_kvm_info.vcpu;
+
+ vcpu->flags = IORESOURCE_MEM;
+ vcpu->start = acpi_data.vcpu_base;
+ vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
+ }
+
+ gic_set_kvm_info(&gic_v3_kvm_info);
+}
+

static int __init
gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end)
@@ -1159,6 +1240,8 @@ gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end)
goto out_fwhandle_free;

acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
+ gic_acpi_setup_kvm_info();
+
return 0;

out_fwhandle_free:
diff --git a/include/linux/irqchip/arm-gic-common.h b/include/linux/irqchip/arm-gic-common.h
index f7723b9..15d68c6 100644
--- a/include/linux/irqchip/arm-gic-common.h
+++ b/include/linux/irqchip/arm-gic-common.h
@@ -15,6 +15,7 @@

enum gic_type {
GIC_V2,
+ GIC_V3,
};

struct gic_kvm_info {
--
1.9.1