diff options
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v2m.c | 85 | ||||
| -rw-r--r-- | drivers/irqchip/irq-gic-v3.c | 3 |
2 files changed, 71 insertions, 17 deletions
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c index 3c77ab676e54..5356739d4799 100644 --- a/drivers/irqchip/irq-gic-v2m.c +++ b/drivers/irqchip/irq-gic-v2m.c @@ -56,6 +56,7 @@ /* List of flags for specific v2m implementation */ #define GICV2M_NEEDS_SPI_OFFSET 0x00000001 +#define GICV2M_GRAVITON_ADDRESS_ONLY 0x00000002 static LIST_HEAD(v2m_nodes); static DEFINE_SPINLOCK(v2m_lock); @@ -98,15 +99,26 @@ static struct msi_domain_info gicv2m_msi_domain_info = { .chip = &gicv2m_msi_irq_chip, }; +static phys_addr_t gicv2m_get_msi_addr(struct v2m_data *v2m, int hwirq) +{ + if (v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY) + return v2m->res.start | ((hwirq - 32) << 3); + else + return v2m->res.start + V2M_MSI_SETSPI_NS; +} + static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) { struct v2m_data *v2m = irq_data_get_irq_chip_data(data); - phys_addr_t addr = v2m->res.start + V2M_MSI_SETSPI_NS; + phys_addr_t addr = gicv2m_get_msi_addr(v2m, data->hwirq); msg->address_hi = upper_32_bits(addr); msg->address_lo = lower_32_bits(addr); - msg->data = data->hwirq; + if (v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY) + msg->data = 0; + else + msg->data = data->hwirq; if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET) msg->data -= v2m->spi_offset; @@ -188,7 +200,7 @@ static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, hwirq = v2m->spi_start + offset; err = iommu_dma_prepare_msi(info->desc, - v2m->res.start + V2M_MSI_SETSPI_NS); + gicv2m_get_msi_addr(v2m, hwirq)); if (err) return err; @@ -307,7 +319,7 @@ static int gicv2m_allocate_domains(struct irq_domain *parent) static int __init gicv2m_init_one(struct fwnode_handle *fwnode, u32 spi_start, u32 nr_spis, - struct resource *res) + struct resource *res, u32 flags) { int ret; struct v2m_data *v2m; @@ -320,6 +332,7 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode, INIT_LIST_HEAD(&v2m->entry); v2m->fwnode = fwnode; + v2m->flags = flags; memcpy(&v2m->res, res, sizeof(struct resource)); @@ -334,7 +347,14 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode, v2m->spi_start = spi_start; v2m->nr_spis = nr_spis; } else { - u32 typer = readl_relaxed(v2m->base + V2M_MSI_TYPER); + u32 typer; + + /* Graviton should always have explicit spi_start/nr_spis */ + if (v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY) { + ret = -EINVAL; + goto err_iounmap; + } + typer = readl_relaxed(v2m->base + V2M_MSI_TYPER); v2m->spi_start = V2M_MSI_TYPER_BASE_SPI(typer); v2m->nr_spis = V2M_MSI_TYPER_NUM_SPI(typer); @@ -355,18 +375,21 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode, * * Broadom NS2 GICv2m implementation has an erratum where the MSI data * is 'spi_number - 32' + * + * Reading that register fails on the Graviton implementation */ - switch (readl_relaxed(v2m->base + V2M_MSI_IIDR)) { - case XGENE_GICV2M_MSI_IIDR: - v2m->flags |= GICV2M_NEEDS_SPI_OFFSET; - v2m->spi_offset = v2m->spi_start; - break; - case BCM_NS2_GICV2M_MSI_IIDR: - v2m->flags |= GICV2M_NEEDS_SPI_OFFSET; - v2m->spi_offset = 32; - break; + if (!(v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY)) { + switch (readl_relaxed(v2m->base + V2M_MSI_IIDR)) { + case XGENE_GICV2M_MSI_IIDR: + v2m->flags |= GICV2M_NEEDS_SPI_OFFSET; + v2m->spi_offset = v2m->spi_start; + break; + case BCM_NS2_GICV2M_MSI_IIDR: + v2m->flags |= GICV2M_NEEDS_SPI_OFFSET; + v2m->spi_offset = 32; + break; + } } - v2m->bm = kcalloc(BITS_TO_LONGS(v2m->nr_spis), sizeof(long), GFP_KERNEL); if (!v2m->bm) { @@ -419,7 +442,8 @@ static int __init gicv2m_of_init(struct fwnode_handle *parent_handle, pr_info("DT overriding V2M MSI_TYPER (base:%u, num:%u)\n", spi_start, nr_spis); - ret = gicv2m_init_one(&child->fwnode, spi_start, nr_spis, &res); + ret = gicv2m_init_one(&child->fwnode, spi_start, nr_spis, + &res, 0); if (ret) { of_node_put(child); break; @@ -451,6 +475,25 @@ static struct fwnode_handle *gicv2m_get_fwnode(struct device *dev) return data->fwnode; } +static bool acpi_check_amazon_graviton_quirks(void) +{ + static struct acpi_table_madt *madt; + acpi_status status; + bool rc = false; + +#define ACPI_AMZN_OEM_ID "AMAZON" + + status = acpi_get_table(ACPI_SIG_MADT, 0, + (struct acpi_table_header **)&madt); + + if (ACPI_FAILURE(status) || !madt) + return rc; + rc = !memcmp(madt->header.oem_id, ACPI_AMZN_OEM_ID, ACPI_OEM_ID_SIZE); + acpi_put_table((struct acpi_table_header *)madt); + + return rc; +} + static int __init acpi_parse_madt_msi(union acpi_subtable_headers *header, const unsigned long end) @@ -460,6 +503,7 @@ acpi_parse_madt_msi(union acpi_subtable_headers *header, u32 spi_start = 0, nr_spis = 0; struct acpi_madt_generic_msi_frame *m; struct fwnode_handle *fwnode; + u32 flags = 0; m = (struct acpi_madt_generic_msi_frame *)header; if (BAD_MADT_ENTRY(m, end)) @@ -469,6 +513,13 @@ acpi_parse_madt_msi(union acpi_subtable_headers *header, res.end = m->base_address + SZ_4K - 1; res.flags = IORESOURCE_MEM; + if (acpi_check_amazon_graviton_quirks()) { + pr_info("applying Amazon Graviton quirk\n"); + res.end = res.start + SZ_8K - 1; + flags |= GICV2M_GRAVITON_ADDRESS_ONLY; + gicv2m_msi_domain_info.flags &= ~MSI_FLAG_MULTI_PCI_MSI; + } + if (m->flags & ACPI_MADT_OVERRIDE_SPI_VALUES) { spi_start = m->spi_base; nr_spis = m->spi_count; @@ -483,7 +534,7 @@ acpi_parse_madt_msi(union acpi_subtable_headers *header, return -EINVAL; } - ret = gicv2m_init_one(fwnode, spi_start, nr_spis, &res); + ret = gicv2m_init_one(fwnode, spi_start, nr_spis, &res, flags); if (ret) irq_domain_free_fwnode(fwnode); diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index f44cd89cfc40..1282f81696b2 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -1343,6 +1343,9 @@ static int __init gic_init_bases(void __iomem *dist_base, if (gic_dist_supports_lpis()) { its_init(handle, &gic_data.rdists, gic_data.domain); its_cpu_init(); + } else { + if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) + gicv2m_init(handle, gic_data.domain); } if (gic_prio_masking_enabled()) { |