diff options
Diffstat (limited to 'drivers/irqchip/irq-gic-v3.c')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3.c | 114 |
1 files changed, 101 insertions, 13 deletions
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 2cada42022ee..dd16a608a988 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -40,6 +40,7 @@ struct redist_region { void __iomem *redist_base; phys_addr_t phys_base; + bool single_redist; }; struct gic_chip_data { @@ -436,6 +437,9 @@ static int gic_populate_rdist(void) return 0; } + if (gic_data.redist_regions[i].single_redist) + break; + if (gic_data.redist_stride) { ptr += gic_data.redist_stride; } else { @@ -964,8 +968,21 @@ out_unmap_dist: IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init); #ifdef CONFIG_ACPI +static void __iomem *dist_base; static struct redist_region *redist_regs __initdata; static u32 nr_redist_regions __initdata; +static bool single_redist; + +static void __init +gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base) +{ + static int count = 0; + + redist_regs[count].phys_base = phys_base; + redist_regs[count].redist_base = redist_base; + redist_regs[count].single_redist = single_redist; + count++; +} static int __init gic_acpi_parse_madt_redist(struct acpi_subtable_header *header, @@ -974,7 +991,6 @@ gic_acpi_parse_madt_redist(struct acpi_subtable_header *header, struct acpi_madt_generic_redistributor *redist = (struct acpi_madt_generic_redistributor *)header; void __iomem *redist_base; - static int count = 0; redist_base = ioremap(redist->base_address, redist->length); if (!redist_base) { @@ -982,12 +998,49 @@ gic_acpi_parse_madt_redist(struct acpi_subtable_header *header, return -ENOMEM; } - redist_regs[count].phys_base = redist->base_address; - redist_regs[count].redist_base = redist_base; - count++; + gic_acpi_register_redist(redist->base_address, redist_base); return 0; } +static int __init +gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header, + const unsigned long end) +{ + struct acpi_madt_generic_interrupt *gicc = + (struct acpi_madt_generic_interrupt *)header; + u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK; + u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2; + void __iomem *redist_base; + + redist_base = ioremap(gicc->gicr_base_address, size); + if (!redist_base) + return -ENOMEM; + + gic_acpi_register_redist(gicc->gicr_base_address, redist_base); + return 0; +} + +static int __init gic_acpi_collect_gicr_base(void) +{ + acpi_tbl_entry_handler redist_parser; + enum acpi_madt_type type; + + if (single_redist) { + type = ACPI_MADT_TYPE_GENERIC_INTERRUPT; + redist_parser = gic_acpi_parse_madt_gicc; + } else { + type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR; + redist_parser = gic_acpi_parse_madt_redist; + } + + /* Collect redistributor base addresses in GICR entries */ + if (acpi_table_parse_madt(type, redist_parser, 0) > 0) + return 0; + + pr_info("No valid GICR entries exist\n"); + return -ENODEV; +} + static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header, const unsigned long end) { @@ -995,6 +1048,46 @@ static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header, return 0; } +static int __init gic_acpi_match_gicc(struct acpi_subtable_header *header, + const unsigned long end) +{ + struct acpi_madt_generic_interrupt *gicc = + (struct acpi_madt_generic_interrupt *)header; + + /* + * If GICC is enabled and has valid gicr base address, then it means + * GICR base is presented via GICC + */ + if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) + return 0; + + return -ENODEV; +} + +static int __init gic_acpi_count_gicr_regions(void) +{ + int count; + + /* + * Count how many redistributor regions we have. It is not allowed + * to mix redistributor description, GICR and GICC subtables have to be + * mutually exclusive. + */ + count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, + gic_acpi_match_gicr, 0); + if (count > 0) { + single_redist = false; + return count; + } + + count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, + gic_acpi_match_gicc, 0); + if (count > 0) + single_redist = true; + + return count; +} + static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header, struct acpi_probe_entry *ape) { @@ -1006,8 +1099,7 @@ static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header, return false; /* We need to do that exercise anyway, the sooner the better */ - count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, - gic_acpi_match_gicr, 0); + count = gic_acpi_count_gicr_regions(); if (count <= 0) return false; @@ -1022,8 +1114,7 @@ gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end) { struct acpi_madt_generic_distributor *dist; struct fwnode_handle *domain_handle; - void __iomem *dist_base; - int i, err, count; + int i, err; /* Get distributor base address */ dist = (struct acpi_madt_generic_distributor *)header; @@ -1046,12 +1137,9 @@ gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end) goto out_dist_unmap; } - count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, - gic_acpi_parse_madt_redist, 0); - if (count <= 0) { - err = -ENODEV; + err = gic_acpi_collect_gicr_base(); + if (err) goto out_redist_unmap; - } domain_handle = irq_domain_alloc_fwnode(dist_base); if (!domain_handle) { |