Similar to of_iommu_for_each_id() this parses the IORT ACPI description and invokes a function over each entry in the table.
Have iort_iommu_configure_id() use the new function to call iort_iommu_xlate(). Signed-off-by: Jason Gunthorpe <[email protected]> --- drivers/acpi/arm64/iort.c | 118 ++++++++++++++++++++++++-------------- include/linux/acpi_iort.h | 12 ++++ 2 files changed, 86 insertions(+), 44 deletions(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index bdaf9256870d92..5c9b4c23f96a87 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -1218,9 +1218,10 @@ static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node) return pci_rc->ats_attribute & ACPI_IORT_ATS_SUPPORTED; } -static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, - u32 streamid) +static int iort_iommu_xlate(struct acpi_iort_node *node, u32 streamid, + void *info) { + struct device *dev = info; const struct iommu_ops *ops; struct fwnode_handle *iort_fwnode; @@ -1250,9 +1251,11 @@ static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, struct iort_pci_alias_info { struct device *dev; struct acpi_iort_node *node; + iort_for_each_fn fn; + void *info; }; -static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) +static int __for_each_pci_alias(struct pci_dev *pdev, u16 alias, void *data) { struct iort_pci_alias_info *info = data; struct acpi_iort_node *parent; @@ -1260,7 +1263,7 @@ static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) parent = iort_node_map_id(info->node, alias, &streamid, IORT_IOMMU_TYPE); - return iort_iommu_xlate(info->dev, parent, streamid); + return info->fn(parent, streamid, info->info); } static void iort_named_component_init(struct device *dev, @@ -1280,7 +1283,8 @@ static void iort_named_component_init(struct device *dev, dev_warn(dev, "Could not add device properties\n"); } -static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node) +static int __for_each_platform(struct acpi_iort_node *node, iort_for_each_fn fn, + void *info) { struct acpi_iort_node *parent; int err = -ENODEV, i = 0; @@ -1293,27 +1297,71 @@ static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node) i++); if (parent) - err = iort_iommu_xlate(dev, parent, streamid); + err = fn(parent, streamid, info); } while (parent && !err); return err; } -static int iort_nc_iommu_map_id(struct device *dev, - struct acpi_iort_node *node, - const u32 *in_id) +int iort_iommu_for_each_id(struct device *dev, const u32 *id_in, + struct iort_params *params, iort_for_each_fn fn, + void *info) { - struct acpi_iort_node *parent; - u32 streamid; + struct acpi_iort_named_component *nc; + struct acpi_iort_node *node; + int err = -ENODEV; - parent = iort_node_map_id(node, *in_id, &streamid, IORT_IOMMU_TYPE); - if (parent) - return iort_iommu_xlate(dev, parent, streamid); + memset(params, 0, sizeof(*params)); + if (dev_is_pci(dev)) { + struct pci_bus *bus = to_pci_dev(dev)->bus; + struct iort_pci_alias_info pci_info = { .dev = dev, + .fn = fn, + .info = info }; - return -ENODEV; + node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, + iort_match_node_callback, &bus->dev); + if (!node) + return -ENODEV; + + pci_info.node = node; + err = pci_for_each_dma_alias(to_pci_dev(dev), + __for_each_pci_alias, &pci_info); + + if (iort_pci_rc_supports_ats(node)) + params->pci_rc_ats = true; + return 0; + } + + node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, + iort_match_node_callback, dev); + if (!node) + return -ENODEV; + + if (id_in) { + struct acpi_iort_node *parent; + u32 streamid; + + parent = iort_node_map_id(node, *id_in, &streamid, + IORT_IOMMU_TYPE); + if (!parent) + return -ENODEV; + err = fn(parent, streamid, info); + } else { + err = __for_each_platform(node, fn, info); + } + if (err) + return err; + + nc = (struct acpi_iort_named_component *)node->node_data; + params->pasid_num_bits = FIELD_GET(ACPI_IORT_NC_PASID_BITS, + nc->node_flags); + if (nc->node_flags & ACPI_IORT_NC_STALL_SUPPORTED) + params->dma_can_stall = true; + + iort_named_component_init(dev, node); + return 0; } - /** * iort_iommu_configure_id - Set-up IOMMU configuration for a device. * @@ -1324,40 +1372,22 @@ static int iort_nc_iommu_map_id(struct device *dev, */ int iort_iommu_configure_id(struct device *dev, const u32 *id_in) { - struct acpi_iort_node *node; - int err = -ENODEV; + struct iort_params params; + int err; - if (dev_is_pci(dev)) { + err = iort_iommu_for_each_id(dev, id_in, ¶ms, &iort_iommu_xlate, + dev); + if (err) + return err; + + if (params.pci_rc_ats) { struct iommu_fwspec *fwspec; - struct pci_bus *bus = to_pci_dev(dev)->bus; - struct iort_pci_alias_info info = { .dev = dev }; - - node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, - iort_match_node_callback, &bus->dev); - if (!node) - return -ENODEV; - - info.node = node; - err = pci_for_each_dma_alias(to_pci_dev(dev), - iort_pci_iommu_init, &info); fwspec = dev_iommu_fwspec_get(dev); - if (fwspec && iort_pci_rc_supports_ats(node)) + if (fwspec) fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS; - } else { - node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, - iort_match_node_callback, dev); - if (!node) - return -ENODEV; - - err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) : - iort_nc_iommu_map(dev, node); - - if (!err) - iort_named_component_init(dev, node); } - - return err; + return 0; } #else diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index 1cb65592c95dd3..5423abff9b6b09 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -29,6 +29,18 @@ void iort_deregister_domain_token(int trans_id); struct fwnode_handle *iort_find_domain_token(int trans_id); int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); +struct iort_params { + unsigned int pasid_num_bits; + bool dma_can_stall : 1; + bool pci_rc_ats : 1; +}; + +typedef int (*iort_for_each_fn)(struct acpi_iort_node *iommu, u32 streamid, + void *info); +int iort_iommu_for_each_id(struct device *dev, const u32 *id_in, + struct iort_params *params, iort_for_each_fn fn, + void *info); + #ifdef CONFIG_ACPI_IORT u32 iort_msi_map_id(struct device *dev, u32 id); struct irq_domain *iort_get_device_domain(struct device *dev, u32 id, -- 2.42.0
