Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S938317AbcLVFmj (ORCPT ); Thu, 22 Dec 2016 00:42:39 -0500 Received: from szxga01-in.huawei.com ([58.251.152.64]:54888 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1764673AbcLVFmg (ORCPT ); Thu, 22 Dec 2016 00:42:36 -0500 From: Hanjun Guo To: Marc Zyngier , "Rafael J. Wysocki" , Lorenzo Pieralisi CC: , , , Thomas Gleixner , Greg KH , Tomasz Nowicki , Ma Jun , Kefeng Wang , "Agustin Vega-Frias" , Sinan Kaya , Charles Garcia-Tobin , , , , , Hanjun Guo Subject: [PATCH v5 10/14] ACPI: ARM64: IORT: rework iort_node_get_id() for NC->SMMU->ITS case Date: Thu, 22 Dec 2016 13:35:18 +0800 Message-ID: <1482384922-21507-11-git-send-email-guohanjun@huawei.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: <1482384922-21507-1-git-send-email-guohanjun@huawei.com> References: <1482384922-21507-1-git-send-email-guohanjun@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3322 Lines: 108 From: Hanjun Guo iort_node_get_id() for now only support NC(named componant)->SMMU or NC->ITS cases, we also have other device topology such NC-> SMMU->ITS, so rework iort_node_get_id() for those cases. Signed-off-by: Hanjun Guo Cc: Lorenzo Pieralisi --- drivers/acpi/arm64/iort.c | 59 ++++++++++++++++++++++++++--------------------- 1 file changed, 33 insertions(+), 26 deletions(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 6b72fcb..9b3f268 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -292,22 +292,28 @@ static acpi_status iort_match_node_callback(struct acpi_iort_node *node, return status; } -static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in, - u32 *rid_out) +static int iort_id_single_map(struct acpi_iort_id_mapping *map, u8 type, + u32 *rid_out) { /* Single mapping does not care for input id */ if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) { if (type == ACPI_IORT_NODE_NAMED_COMPONENT || type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) { - *rid_out = map->output_base; + if (rid_out) + *rid_out = map->output_base; return 0; } pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n", map, type); - return -ENXIO; } + return -ENXIO; +} + +static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in, + u32 *rid_out) +{ if (rid_in < map->input_base || (rid_in >= map->input_base + map->id_count)) return -ENXIO; @@ -324,33 +330,34 @@ struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node, 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); + while (node) { + if (!node->mapping_offset || !node->mapping_count || + index >= node->mapping_count) + return NULL; - /* 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; - } + map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node, + node->mapping_offset); - parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table, - map->output_reference); + /* 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; + } - if (!(IORT_TYPE_MASK(parent->type) & type_mask)) - return NULL; + parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table, + map->output_reference); - 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) { - if (id_out) - *id_out = map[index].output_base; - return parent; + /* go upstream to find its parent */ + if (!(IORT_TYPE_MASK(parent->type) & type_mask)) { + node = parent; + continue; } + + if (iort_id_single_map(&map[index], node->type, id_out)) + break; + + return parent; } return NULL; -- 1.7.12.4