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Date: Wed, 9 Nov 2016 14:19:47 +0000 From: Lorenzo Pieralisi <lorenzo.pieralisi@....com> To: iommu@...ts.linux-foundation.org Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Hanjun Guo <hanjun.guo@...aro.org>, Tomasz Nowicki <tn@...ihalf.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Will Deacon <will.deacon@....com>, Marc Zyngier <marc.zyngier@....com>, Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>, Jon Masters <jcm@...hat.com>, Eric Auger <eric.auger@...hat.com>, Sinan Kaya <okaya@...eaurora.org>, Nate Watterson <nwatters@...eaurora.org>, Prem Mallappa <prem.mallappa@...adcom.com>, Dennis Chen <dennis.chen@....com>, linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: [PATCH v7 15/16] drivers: acpi: iort: add single mapping function The current IORT id mapping API requires components to provide an input requester ID (a Bus-Device-Function (BDF) identifier for PCI devices) to translate an input identifier to an output identifier through an IORT range mapping. Named components do not have an identifiable source ID therefore their respective input/output mapping can only be defined in IORT tables through single mappings, that provide a translation that does not require any input identifier. Current IORT interface for requester id mappings (iort_node_map_rid()) is not suitable for components that do not provide a requester id, so it cannot be used for IORT named components. Add an interface to the IORT API to enable retrieval of id by allowing an indexed walk of the single mappings array for a given component, therefore completing the IORT mapping API. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com> Tested-by: Hanjun Guo <hanjun.guo@...aro.org> Tested-by: Tomasz Nowicki <tn@...ihalf.com> Cc: Hanjun Guo <hanjun.guo@...aro.org> Cc: Tomasz Nowicki <tn@...ihalf.com> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net> --- drivers/acpi/arm64/iort.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 62057c6..7d30605 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -318,6 +318,45 @@ static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in, return 0; } +static +struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node, + u32 *id_out, u8 type_mask, + int index) +{ + struct acpi_iort_node *parent; + struct acpi_iort_id_mapping *map; + + if (!node->mapping_offset || !node->mapping_count || + index >= node->mapping_count) + return NULL; + + map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node, + node->mapping_offset); + + /* Firmware bug! */ + if (!map->output_reference) { + pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n", + node, node->type); + return NULL; + } + + parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table, + map->output_reference); + + if (!(IORT_TYPE_MASK(parent->type) & type_mask)) + return NULL; + + if (map[index].flags & ACPI_IORT_ID_SINGLE_MAPPING) { + if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT || + node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) { + *id_out = map[index].output_base; + return parent; + } + } + + return NULL; +} + static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node, u32 rid_in, u32 *rid_out, u8 type_mask) -- 2.10.0
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