From patchwork Tue Apr 20 08:27:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 12213631 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 84AE2C433B4 for ; Tue, 20 Apr 2021 09:28:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5574C61090 for ; Tue, 20 Apr 2021 09:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230429AbhDTJ3E (ORCPT ); Tue, 20 Apr 2021 05:29:04 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:16606 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229761AbhDTJ3E (ORCPT ); Tue, 20 Apr 2021 05:29:04 -0400 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4FPdbQ05w2z19M2h; Tue, 20 Apr 2021 17:26:10 +0800 (CST) Received: from A2006125610.china.huawei.com (10.47.83.26) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.498.0; Tue, 20 Apr 2021 17:28:20 +0800 From: Shameer Kolothum To: , , CC: , , , , , , , , , Subject: [PATCH v3 03/10] ACPI/IORT: Add a helper to retrieve RMR memory regions Date: Tue, 20 Apr 2021 10:27:44 +0200 Message-ID: <20210420082751.1829-4-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20210420082751.1829-1-shameerali.kolothum.thodi@huawei.com> References: <20210420082751.1829-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.83.26] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add a helper function that retrieves RMR memory descriptors associated with a given IOMMU. This will be used by IOMMU drivers to setup necessary mappings. Now that we have this, invoke this from the generic helper interface. Signed-off-by: Shameer Kolothum --- drivers/acpi/arm64/iort.c | 40 +++++++++++++++++++++++++++++++++++++++ drivers/iommu/dma-iommu.c | 3 +++ include/linux/acpi_iort.h | 7 +++++++ 3 files changed, 50 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index bd96c5e3b36e..66e314b15692 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -12,6 +12,7 @@ #include #include +#include #include #include #include @@ -837,6 +838,43 @@ static inline int iort_add_device_replay(struct device *dev) return err; } +/** + * iort_iommu_get_rmrs - Helper to retrieve RMR info associated with IOMMU + * @iommu: fwnode for the IOMMU + * @head: RMR list head to be populated + * + * Returns: 0 on success, <0 failure + */ +int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *head) +{ + struct iort_rmr_entry *e; + struct acpi_iort_node *iommu; + + iommu = iort_get_iort_node(iommu_fwnode); + if (!iommu) + return 0; + + list_for_each_entry(e, &iort_rmr_list, list) { + struct acpi_iort_rmr_desc *rmr_desc; + struct iommu_rmr *rmr; + + if (e->smmu != iommu) + continue; + + rmr_desc = e->rmr_desc; + rmr = iommu_dma_alloc_rmr(rmr_desc->base_address, + rmr_desc->length, e->sid, + e->flags); + if (!rmr) + return -ENOMEM; + + list_add_tail(&rmr->list, head); + } + + return 0; +} + /** * iort_iommu_msi_get_resv_regions - Reserved region driver helper * @dev: Device from iommu_get_resv_regions() @@ -1107,6 +1145,8 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) const struct iommu_ops *iort_iommu_configure_id(struct device *dev, const u32 *input_id) { return NULL; } +int iort_iommu_get_rmrs(struct fwnode_handle *fwnode, struct list_head *head) +{ return 0; } #endif static int nc_dma_get_range(struct device *dev, u64 *size) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 86a1e48b1fe8..a942cc04eee1 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -201,6 +201,9 @@ EXPORT_SYMBOL(iommu_dma_get_resv_regions); int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode, struct list_head *list) { + if (!is_of_node(iommu_fwnode)) + return iort_iommu_get_rmrs(iommu_fwnode, list); + return 0; } EXPORT_SYMBOL(iommu_dma_get_rmrs); diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index 1a12baa58e40..e9f3bc2f4842 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -39,6 +39,8 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev, const u32 *id_in); int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head); phys_addr_t acpi_iort_dma_get_max_cpu_address(void); +int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *list); #else static inline void acpi_iort_init(void) { } static inline u32 iort_msi_map_id(struct device *dev, u32 id) @@ -59,6 +61,11 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) static inline phys_addr_t acpi_iort_dma_get_max_cpu_address(void) { return PHYS_ADDR_MAX; } + +static inline +int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *list) +{ return 0; } #endif #endif /* __ACPI_IORT_H__ */