This patch adds ACPI support for AL-MSIx driver. The AL-MSIx controller is not standard, is not included in the UEFI specification, and will not be added. The driver ACPI binding is performed when the following conditions are true: - OEM ID is AMAZON - MADT table type is 0x80 (part of the OEM reserved range).
Signed-off-by: Hanna Hawa <[email protected]> Co-developed-by: Vladimir Aerov <[email protected]> Signed-off-by: Vladimir Aerov <[email protected]> --- drivers/irqchip/irq-al-msi.c | 118 ++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 111 insertions(+), 7 deletions(-) diff --git a/drivers/irqchip/irq-al-msi.c b/drivers/irqchip/irq-al-msi.c index ec27455..cb80c1e 100644 --- a/drivers/irqchip/irq-al-msi.c +++ b/drivers/irqchip/irq-al-msi.c @@ -9,6 +9,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/acpi.h> #include <linux/dma-iommu.h> #include <linux/irqchip.h> #include <linux/irqchip/arm-gic.h> @@ -126,14 +127,20 @@ static int al_msix_gic_domain_alloc(struct irq_domain *domain, struct irq_data *d; int ret; - if (!is_of_node(domain->parent->fwnode)) + if (is_of_node(domain->parent->fwnode)) { + fwspec.fwnode = domain->parent->fwnode; + fwspec.param_count = 3; + fwspec.param[0] = 0; + fwspec.param[1] = spi; + 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] = spi + 32; + fwspec.param[1] = IRQ_TYPE_EDGE_RISING; + } else { return -EINVAL; - - fwspec.fwnode = domain->parent->fwnode; - fwspec.param_count = 3; - fwspec.param[0] = 0; - fwspec.param[1] = spi; - fwspec.param[2] = IRQ_TYPE_EDGE_RISING; + } ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); if (ret) @@ -304,3 +311,100 @@ static int al_msix_init(struct device_node *node, struct device_node *parent) } IRQCHIP_DECLARE(alpine_msix, "al,alpine-msix", al_msix_init); IRQCHIP_DECLARE(al_msix, "amazon,al-msix", al_msix_init); + +#ifdef CONFIG_ACPI +static struct al_msix_data *priv; + +#define ACPI_AMZN_MADT_OEM_TYPE 0x80 +#define ACPI_AMZN_OEM_ID "AMAZON" + +struct acpi_madt_msix_oem_frame { + struct acpi_subtable_header header; + u64 base_address; + u32 base_address_len; + u16 spi_count; + u16 spi_base; +}; + +static struct fwnode_handle *al_msi_get_fwnode(struct device *dev) +{ + return priv->msi_domain_handle; +} + +static int __init al_msix_acpi_probe(struct acpi_subtable_header *header, + const unsigned long end) +{ + struct irq_domain *gic_domain; + struct fwnode_handle *gic_domain_handle; + struct acpi_madt_msix_oem_frame *m; + int ret; + + m = container_of(header, struct acpi_madt_msix_oem_frame, header); + if (BAD_MADT_ENTRY(m, end)) + return -EINVAL; + + gic_domain_handle = acpi_get_gsi_domain_id(); + if (!gic_domain_handle) { + pr_err("Failed to find the GIC domain handle\n"); + return -ENXIO; + } + + gic_domain = irq_find_matching_fwnode(gic_domain_handle, + DOMAIN_BUS_ANY); + if (!gic_domain) { + pr_err("Failed to find the GIC domain\n"); + return -ENXIO; + } + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->spi_first = m->spi_base; + priv->num_spis = m->spi_count; + + priv->msi_domain_handle = irq_domain_alloc_fwnode((void *) + m->base_address); + if (!priv->msi_domain_handle) { + pr_err("Unable to allocate msi domain token\n"); + ret = -EINVAL; + goto err_acpi_priv; + } + + ret = al_msix_init_common(priv, m->base_address); + if (ret) + goto err_acpi_priv; + + ret = al_msix_init_domains(priv, gic_domain); + if (ret) + goto err_acpi_map; + + pci_msi_register_fwnode_provider(&al_msi_get_fwnode); + + return 0; + +err_acpi_map: + kfree(priv->msi_map); +err_acpi_priv: + kfree(priv); + return ret; +} + +static int __init al_msix_acpi_init(void) +{ + static struct acpi_table_madt *madt; + acpi_status status; + + /* if ACPI MADT table is not Amazon defined return */ + status = acpi_get_table(ACPI_SIG_MADT, 0, + (struct acpi_table_header **)&madt); + if (ACPI_FAILURE(status) || (madt && memcmp(madt->header.oem_id, + ACPI_AMZN_OEM_ID, + ACPI_OEM_ID_SIZE))) + return -ENODEV; + + return acpi_table_parse_madt(ACPI_AMZN_MADT_OEM_TYPE, + al_msix_acpi_probe, 0); +} +early_initcall(al_msix_acpi_init); +#endif /* CONFIG_ACPI */ -- 2.7.4
