From 643b8e4d86f8b1a62cf5cd9ea221e9bc0d531d18 Mon Sep 17 00:00:00 2001 From: Lorenzo Pieralisi Date: Mon, 21 Nov 2016 10:01:48 +0000 Subject: ACPI/IORT: Introduce iort_iommu_configure DT based systems have a generic kernel API to configure IOMMUs for devices (ie of_iommu_configure()). On ARM based ACPI systems, the of_iommu_configure() equivalent can be implemented atop ACPI IORT kernel API, with the corresponding functions to map device identifiers to IOMMUs and retrieve the corresponding IOMMU operations necessary for DMA operations set-up. By relying on the iommu_fwspec generic kernel infrastructure, implement the IORT based IOMMU configuration for ARM ACPI systems and hook it up in the ACPI kernel layer that implements DMA configuration for a device. Signed-off-by: Lorenzo Pieralisi Acked-by: Rafael J. Wysocki [ACPI core] Reviewed-by: Tomasz Nowicki Tested-by: Hanjun Guo Tested-by: Tomasz Nowicki Cc: Hanjun Guo Cc: Tomasz Nowicki Cc: "Rafael J. Wysocki" Signed-off-by: Will Deacon --- drivers/acpi/arm64/iort.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) (limited to 'drivers/acpi/arm64') diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 6aae49c35a95..47bace8eafb6 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -28,6 +28,8 @@ #define IORT_TYPE_MASK(type) (1 << (type)) #define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP) +#define IORT_IOMMU_TYPE ((1 << ACPI_IORT_NODE_SMMU) | \ + (1 << ACPI_IORT_NODE_SMMU_V3)) struct iort_its_msi_chip { struct list_head list; @@ -501,6 +503,102 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id) return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI); } +static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data) +{ + u32 *rid = data; + + *rid = alias; + return 0; +} + +static int arm_smmu_iort_xlate(struct device *dev, u32 streamid, + struct fwnode_handle *fwnode, + const struct iommu_ops *ops) +{ + int ret = iommu_fwspec_init(dev, fwnode, ops); + + if (!ret) + ret = iommu_fwspec_add_ids(dev, &streamid, 1); + + return ret; +} + +static const struct iommu_ops *iort_iommu_xlate(struct device *dev, + struct acpi_iort_node *node, + u32 streamid) +{ + const struct iommu_ops *ops = NULL; + int ret = -ENODEV; + struct fwnode_handle *iort_fwnode; + + if (node) { + iort_fwnode = iort_get_fwnode(node); + if (!iort_fwnode) + return NULL; + + ops = iommu_get_instance(iort_fwnode); + if (!ops) + return NULL; + + ret = arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops); + } + + return ret ? NULL : ops; +} + +/** + * iort_iommu_configure - Set-up IOMMU configuration for a device. + * + * @dev: device to configure + * + * Returns: iommu_ops pointer on configuration success + * NULL on configuration failure + */ +const struct iommu_ops *iort_iommu_configure(struct device *dev) +{ + struct acpi_iort_node *node, *parent; + const struct iommu_ops *ops = NULL; + u32 streamid = 0; + + if (dev_is_pci(dev)) { + struct pci_bus *bus = to_pci_dev(dev)->bus; + u32 rid; + + pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid, + &rid); + + node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, + iort_match_node_callback, &bus->dev); + if (!node) + return NULL; + + parent = iort_node_map_rid(node, rid, &streamid, + IORT_IOMMU_TYPE); + + ops = iort_iommu_xlate(dev, parent, streamid); + + } else { + int i = 0; + + node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, + iort_match_node_callback, dev); + if (!node) + return NULL; + + parent = iort_node_get_id(node, &streamid, + IORT_IOMMU_TYPE, i++); + + while (parent) { + ops = iort_iommu_xlate(dev, parent, streamid); + + parent = iort_node_get_id(node, &streamid, + IORT_IOMMU_TYPE, i++); + } + } + + return ops; +} + static void __init acpi_iort_register_irq(int hwirq, const char *name, int trigger, struct resource *res) -- cgit v1.2.3