diff options
| -rw-r--r-- | drivers/acpi/arm64/iort.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 4bb6acbf881f..ddf83b59791d 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -19,9 +19,11 @@ #define pr_fmt(fmt) "ACPI: IORT: " fmt #include <linux/acpi_iort.h> +#include <linux/iommu.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/pci.h> +#include <linux/platform_device.h> #include <linux/slab.h> struct iort_its_msi_chip { @@ -457,6 +459,153 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id) return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI); } +struct iort_iommu_config { + const char *name; + int (*iommu_init)(struct acpi_iort_node *node); + bool (*iommu_is_coherent)(struct acpi_iort_node *node); + int (*iommu_count_resources)(struct acpi_iort_node *node); + void (*iommu_init_resources)(struct resource *res, + struct acpi_iort_node *node); +}; + +static __init +const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node) +{ + return NULL; +} + +/** + * iort_add_smmu_platform_device() - Allocate a platform device for SMMU + * @node: Pointer to SMMU ACPI IORT node + * + * Returns: 0 on success, <0 failure + */ +static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node) +{ + struct fwnode_handle *fwnode; + struct platform_device *pdev; + struct resource *r; + enum dev_dma_attr attr; + int ret, count; + const struct iort_iommu_config *ops = iort_get_iommu_cfg(node); + + if (!ops) + return -ENODEV; + + pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO); + if (!pdev) + return PTR_ERR(pdev); + + count = ops->iommu_count_resources(node); + + r = kcalloc(count, sizeof(*r), GFP_KERNEL); + if (!r) { + ret = -ENOMEM; + goto dev_put; + } + + ops->iommu_init_resources(r, node); + + ret = platform_device_add_resources(pdev, r, count); + /* + * Resources are duplicated in platform_device_add_resources, + * free their allocated memory + */ + kfree(r); + + if (ret) + goto dev_put; + + /* + * Add a copy of IORT node pointer to platform_data to + * be used to retrieve IORT data information. + */ + ret = platform_device_add_data(pdev, &node, sizeof(node)); + if (ret) + goto dev_put; + + /* + * We expect the dma masks to be equivalent for + * all SMMUs set-ups + */ + pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; + + fwnode = iort_get_fwnode(node); + + if (!fwnode) { + ret = -ENODEV; + goto dev_put; + } + + pdev->dev.fwnode = fwnode; + + attr = ops->iommu_is_coherent(node) ? + DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT; + + /* Configure DMA for the page table walker */ + acpi_dma_configure(&pdev->dev, attr); + + ret = platform_device_add(pdev); + if (ret) + goto dma_deconfigure; + + return 0; + +dma_deconfigure: + acpi_dma_deconfigure(&pdev->dev); +dev_put: + platform_device_put(pdev); + + return ret; +} + +static void __init iort_init_platform_devices(void) +{ + struct acpi_iort_node *iort_node, *iort_end; + struct acpi_table_iort *iort; + struct fwnode_handle *fwnode; + int i, ret; + + /* + * iort_table and iort both point to the start of IORT table, but + * have different struct types + */ + iort = (struct acpi_table_iort *)iort_table; + + /* Get the first IORT node */ + iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort, + iort->node_offset); + iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort, + iort_table->length); + + for (i = 0; i < iort->node_count; i++) { + if (iort_node >= iort_end) { + pr_err("iort node pointer overflows, bad table\n"); + return; + } + + if ((iort_node->type == ACPI_IORT_NODE_SMMU) || + (iort_node->type == ACPI_IORT_NODE_SMMU_V3)) { + + fwnode = acpi_alloc_fwnode_static(); + if (!fwnode) + return; + + iort_set_fwnode(iort_node, fwnode); + + ret = iort_add_smmu_platform_device(iort_node); + if (ret) { + iort_delete_fwnode(iort_node); + acpi_free_fwnode_static(fwnode); + return; + } + } + + iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node, + iort_node->length); + } +} + void __init acpi_iort_init(void) { acpi_status status; @@ -472,5 +621,7 @@ void __init acpi_iort_init(void) return; } + iort_init_platform_devices(); + acpi_probe_device_table(iort); } |