From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9C32C56202 for ; Tue, 27 Oct 2020 11:28:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76BAA22263 for ; Tue, 27 Oct 2020 11:28:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1749880AbgJ0L2M (ORCPT ); Tue, 27 Oct 2020 07:28:12 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:6000 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1749895AbgJ0L2K (ORCPT ); Tue, 27 Oct 2020 07:28:10 -0400 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4CL8Zz4nPpzhcP9; Tue, 27 Oct 2020 19:28:11 +0800 (CST) Received: from S00345302A-PC.china.huawei.com (10.47.24.15) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.487.0; Tue, 27 Oct 2020 19:27:59 +0800 From: Shameer Kolothum To: , , , CC: , , , , , , Subject: [RFC PATCH 2/4] ACPI/IORT: Add support for RMR node parsing Date: Tue, 27 Oct 2020 11:26:44 +0000 Message-ID: <20201027112646.44680-3-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20201027112646.44680-1-shameerali.kolothum.thodi@huawei.com> References: <20201027112646.44680-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [10.47.24.15] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add support for parsing RMR node information from ACPI. Find associated stream ids and smmu node info from the RMR node and populate a linked list with RMR memory descriptors. Signed-off-by: Shameer Kolothum --- drivers/acpi/arm64/iort.c | 119 +++++++++++++++++++++++++++++++++++++- 1 file changed, 118 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 9929ff50c0c0..b32cd53cca08 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -40,6 +40,25 @@ struct iort_fwnode { static LIST_HEAD(iort_fwnode_list); static DEFINE_SPINLOCK(iort_fwnode_lock); +struct iort_rmr_id { + u32 sid; + struct acpi_iort_node *smmu; +}; + +/* + * One entry for IORT RMR. + */ +struct iort_rmr_entry { + struct list_head list; + + unsigned int rmr_ids_num; + struct iort_rmr_id *rmr_ids; + + struct acpi_iort_rmr_desc *rmr_desc; +}; + +static LIST_HEAD(iort_rmr_list); /* list of RMR regions from ACPI */ + /** * iort_set_fwnode() - Create iort_fwnode and use it to register * iommu data in the iort_fwnode_list @@ -393,7 +412,8 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node, if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT || node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX || node->type == ACPI_IORT_NODE_SMMU_V3 || - node->type == ACPI_IORT_NODE_PMCG) { + node->type == ACPI_IORT_NODE_PMCG || + node->type == ACPI_IORT_NODE_RMR) { *id_out = map->output_base; return parent; } @@ -1647,6 +1667,100 @@ static void __init iort_enable_acs(struct acpi_iort_node *iort_node) #else static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { } #endif +static int iort_rmr_desc_valid(struct acpi_iort_rmr_desc *desc) +{ + struct iort_rmr_entry *e; + u64 end, start = desc->base_address, length = desc->length; + + if ((!IS_ALIGNED(start, SZ_64K)) || (length % SZ_64K != 0)) + return -EINVAL; + + end = start + length - 1; + + /* Check for address overlap */ + list_for_each_entry(e, &iort_rmr_list, list) { + u64 e_start = e->rmr_desc->base_address; + u64 e_end = e_start + e->rmr_desc->length - 1; + + if (start <= e_end && end >= e_start) + return -EINVAL; + } + + return 0; +} + +static int __init iort_parse_rmr(struct acpi_iort_node *iort_node) +{ + struct iort_rmr_id *rmr_ids, *ids; + struct iort_rmr_entry *e; + struct acpi_iort_rmr *rmr; + struct acpi_iort_rmr_desc *rmr_desc; + u32 map_count = iort_node->mapping_count; + int i, ret = 0, desc_count = 0; + + if (iort_node->type != ACPI_IORT_NODE_RMR) + return 0; + + if (!iort_node->mapping_offset || !map_count) { + pr_err(FW_BUG "Invalid ID mapping, skipping RMR node %p\n", + iort_node); + return -EINVAL; + } + + rmr_ids = kmalloc(sizeof(*rmr_ids) * map_count, GFP_KERNEL); + if (!rmr_ids) + return -ENOMEM; + + /* Retrieve associated smmu and stream id */ + ids = rmr_ids; + for (i = 0; i < map_count; i++, ids++) { + ids->smmu = iort_node_get_id(iort_node, &ids->sid, i); + if (!ids->smmu) { + pr_err(FW_BUG "Invalid SMMU reference, skipping RMR node %p\n", + iort_node); + ret = -EINVAL; + goto out; + } + } + + /* Retrieve RMR data */ + rmr = (struct acpi_iort_rmr *)iort_node->node_data; + if (!rmr->rmr_offset || !rmr->rmr_count) { + pr_err(FW_BUG "Invalid RMR descriptor array, skipping RMR node %p\n", + iort_node); + ret = -EINVAL; + goto out; + } + + rmr_desc = ACPI_ADD_PTR(struct acpi_iort_rmr_desc, iort_node, + rmr->rmr_offset); + + for (i = 0; i < rmr->rmr_count; i++, rmr_desc++) { + ret = iort_rmr_desc_valid(rmr_desc); + if (ret) { + pr_err(FW_BUG "Invalid RMR descriptor[%d] for node %p, skipping...\n", + i, iort_node); + goto out; + } + + e = kmalloc(sizeof(*e), GFP_KERNEL); + if (!e) + goto out; + e->rmr_ids_num = map_count; + e->rmr_ids = rmr_ids; + e->rmr_desc = rmr_desc; + + list_add_tail(&e->list, &iort_rmr_list); + desc_count++; + } + + return 0; + +out: + if (!desc_count) + kfree(rmr_ids); + return ret; +} static void __init iort_init_platform_devices(void) { @@ -1676,6 +1790,9 @@ static void __init iort_init_platform_devices(void) iort_enable_acs(iort_node); + if (iort_table->revision == 1) + iort_parse_rmr(iort_node); + ops = iort_get_dev_cfg(iort_node); if (ops) { fwnode = acpi_alloc_fwnode_static(); -- 2.17.1