[PATCH v6 4/4] gicv2m: acpi: Introducing GICv2m ACPI support
From: Suravee Suthikulpanit
Date: Wed Dec 09 2015 - 14:25:16 EST
This patch introduces gicv2m_acpi_init(), which uses information
in MADT GIC MSI frames structure to initialize GICv2m driver.
It also exposes gicv2m_init() function, which simplifies callers
to a single GICv2m init function.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
drivers/irqchip/irq-gic-v2m.c | 114 +++++++++++++++++++++++++++++++++++++++-
drivers/irqchip/irq-gic.c | 6 ++-
include/linux/irqchip/arm-gic.h | 3 +-
3 files changed, 120 insertions(+), 3 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 779c390..e01a495 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -15,9 +15,11 @@
#define pr_fmt(fmt) "GICv2m: " fmt
+#include <linux/acpi.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
+#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/slab.h>
@@ -138,6 +140,11 @@ static int gicv2m_irq_gic_domain_alloc(struct irq_domain *domain,
fwspec.param[0] = 0;
fwspec.param[1] = hwirq - 32;
fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
+ } else if (is_fwnode_irqchip(domain->parent->fwnode)) {
+ fwspec.fwnode = domain->parent->fwnode;
+ fwspec.param_count = 2;
+ fwspec.param[0] = hwirq;
+ fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
} else {
return -EINVAL;
}
@@ -255,6 +262,8 @@ static void gicv2m_teardown(void)
kfree(v2m->bm);
iounmap(v2m->base);
of_node_put(to_of_node(v2m->fwnode));
+ if (is_fwnode_irqchip(v2m->fwnode))
+ irq_domain_free_fwnode(v2m->fwnode);
kfree(v2m);
}
}
@@ -373,11 +382,16 @@ static struct of_device_id gicv2m_device_id[] = {
{},
};
-int __init gicv2m_of_init(struct device_node *node, struct irq_domain *parent)
+static int __init gicv2m_of_init(struct fwnode_handle *parent_handle,
+ struct irq_domain *parent)
{
int ret = 0;
+ struct device_node *node = to_of_node(parent_handle);
struct device_node *child;
+ if (!node)
+ return -EINVAL;
+
for (child = of_find_matching_node(node, gicv2m_device_id); child;
child = of_find_matching_node(child, gicv2m_device_id)) {
u32 spi_start = 0, nr_spis = 0;
@@ -411,3 +425,101 @@ int __init gicv2m_of_init(struct device_node *node, struct irq_domain *parent)
gicv2m_teardown();
return ret;
}
+
+#ifdef CONFIG_ACPI
+static int acpi_num_msi;
+
+static struct fwnode_handle *gicv2m_get_fwnode(struct device *dev)
+{
+ struct v2m_data *data;
+
+ if (WARN_ON(acpi_num_msi <= 0))
+ return NULL;
+
+ /* We only return the fwnode of the first MSI frame. */
+ data = list_first_entry_or_null(&v2m_nodes, struct v2m_data, entry);
+ if (!data)
+ return NULL;
+
+ return data->fwnode;
+}
+
+static int __init
+acpi_parse_madt_msi(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ int ret;
+ struct resource res;
+ u32 spi_start = 0, nr_spis = 0;
+ struct acpi_madt_generic_msi_frame *m;
+ struct fwnode_handle *fwnode;
+
+ m = (struct acpi_madt_generic_msi_frame *)header;
+ if (BAD_MADT_ENTRY(m, end))
+ return -EINVAL;
+
+ res.start = m->base_address;
+ res.end = m->base_address + SZ_4K;
+
+ if (m->flags & ACPI_MADT_OVERRIDE_SPI_VALUES) {
+ spi_start = m->spi_base;
+ nr_spis = m->spi_count;
+
+ pr_info("ACPI overriding V2M MSI_TYPER (base:%u, num:%u)\n",
+ spi_start, nr_spis);
+ }
+
+ fwnode = irq_domain_alloc_fwnode((void *)m->base_address);
+ if (!fwnode) {
+ pr_err("Unable to allocate GICv2m domain token\n");
+ return -EINVAL;
+ }
+
+ ret = gicv2m_init_one(fwnode, spi_start, nr_spis, &res);
+ if (ret)
+ irq_domain_free_fwnode(fwnode);
+
+ return ret;
+}
+
+static int __init gicv2m_acpi_init(struct irq_domain *parent)
+{
+ int ret;
+
+ if (acpi_num_msi > 0)
+ return 0;
+
+ acpi_num_msi = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_MSI_FRAME,
+ acpi_parse_madt_msi, 0);
+
+ if (acpi_num_msi <= 0)
+ goto err_out;
+
+ ret = gicv2m_allocate_domains(parent);
+ if (ret)
+ goto err_out;
+
+ pci_msi_register_fwnode_provider(&gicv2m_get_fwnode);
+
+ return 0;
+
+err_out:
+ gicv2m_teardown();
+ return -EINVAL;
+}
+#else /* CONFIG_ACPI */
+static int __init gicv2m_acpi_init(struct irq_domain *parent)
+{
+ return -EINVAL;
+}
+#endif /* CONFIG_ACPI */
+
+int __init gicv2m_init(struct fwnode_handle *parent_handle,
+ struct irq_domain *parent)
+{
+ int ret = gicv2m_of_init(parent_handle, parent);
+
+ if (ret)
+ ret = gicv2m_acpi_init(parent);
+ return ret;
+}
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index fcd327f..644e8bb 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1234,7 +1234,7 @@ gic_of_init(struct device_node *node, struct device_node *parent)
}
if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
- gicv2m_of_init(node, gic_data[gic_cnt].domain);
+ gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
gic_cnt++;
return 0;
@@ -1359,6 +1359,10 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
__gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
+
+ if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
+ gicv2m_init(NULL, gic_data[0].domain);
+
return 0;
}
IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index bae69e5..febc6c3 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -106,7 +106,8 @@ int gic_cpu_if_down(unsigned int gic_nr);
void gic_init(unsigned int nr, int start,
void __iomem *dist , void __iomem *cpu);
-int gicv2m_of_init(struct device_node *node, struct irq_domain *parent);
+int gicv2m_init(struct fwnode_handle *parent_handle,
+ struct irq_domain *parent);
void gic_send_sgi(unsigned int cpu_id, unsigned int irq);
int gic_get_cpu_id(unsigned int cpu);
--
2.1.0
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