irqchip/gic-v2m: acpi: Introducing GICv2m ACPI support

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.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 779c3906a22ec990fe6992555cabeb37ee45be72..7e2975df447301c8106fe51b10c322324f79c714 100644 (file)
--- 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);
        }
 }
@@ -373,9 +382,11 @@ 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;
 
        for (child = of_find_matching_node(node, gicv2m_device_id); child;
@@ -411,3 +422,100 @@ 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)
+{
+       if (is_of_node(parent_handle))
+               return gicv2m_of_init(parent_handle, parent);
+
+       return gicv2m_acpi_init(parent);
+}

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index fcd327f49e8e3e5417575787b3113843a52b58e0..644e8bbe130c16874d0da0e8c3ffe61a1221da6a 100644 (file)
--- 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 bae69e5d693c3e60cea1a209fc06d2d33fdfb960..febc6c312e37a95d21da6738de3dbcab0875872a 100644 (file)
--- 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);