From patchwork Tue Apr 20 08:27:43 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: 424555 Delivered-To: patch@linaro.org Received: by 2002:a02:c901:0:0:0:0:0 with SMTP id t1csp206535jao; Tue, 20 Apr 2021 02:28:24 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyNq1Ld2yxhOnSdHOYntbG8JqCbwPvMojRAnsVe3rmXOoUj1sWUAmuM0jgM4T8JZRmd7BWv X-Received: by 2002:a17:906:fcc4:: with SMTP id qx4mr25972108ejb.42.1618910904202; Tue, 20 Apr 2021 02:28:24 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1618910904; cv=none; d=google.com; s=arc-20160816; b=wKTW22ZUir2CDoQbY0suTzUU68v6xLxMedUp36L190NfIAArvpiaLQNEOSjGSGWDwe TI2fb9CYdOtzdOsWmJF+O0e0r36TnJnRv80kGFXkj3eI+d9bnX23cj4//2u0aQ6nv518 jNWZDeFVBWGBAiUbEtfutW9x7XA7IFSwzTygG/Mwuch2XiZRmrFCbRfL+PJfp1QNPlG7 FS20V51qE8EpFdBMhT+yxnfFw52SUqEnT5pbvuXzFoHbq92CD0VPCgXr7T/NmvzgxDfk FZIq0aSBKXw8MKsI8tol0Cn4khEasimK7W7e1JIe31svsnUQf/3ehd8vo/PAGwQ1kSVU B9ig== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from; bh=hHogLPwCM34JSfiiCvBwvq+K7KPCFjVEOYEsm85w4ms=; b=jFmBKIgz1qkGquD2EDjrRb0tulwInMVDqIYmqdci8w2Vg9ZtooSJoQYOVq80ZdQRhY pQzaa5MIOI/rpDg2Don/wtpA70gs7hPCcDFTJtc76XZT0KnAcKN6vY5qiNtprvLezVPN tEqSsTJn5Z0dzhH8k9t6Y3MAcHiIJl0nhmszPK2X1t5Y0dS03IeWq+ozH2TM718sRkNU KJ+ahfqzd54cyjs7NFCXdHcRM7Slxt31YPqtoivb+J2lNQcB/KFG9/PX8dFaZtFf5N9u /qcXqKb5F01Log3wzeB1AM9FNk3FapTNzvf6F1uF752f9Z80y/rnXzqaoKlUd/HK+Gqt ExkA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-acpi-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-acpi-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id i2si5177143edq.3.2021.04.20.02.28.24; Tue, 20 Apr 2021 02:28:24 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-acpi-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-acpi-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-acpi-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230234AbhDTJ2y (ORCPT + 4 others); Tue, 20 Apr 2021 05:28:54 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:17800 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229761AbhDTJ2y (ORCPT ); Tue, 20 Apr 2021 05:28:54 -0400 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4FPdbC1Qwdz7wMj; Tue, 20 Apr 2021 17:25:59 +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 17:28:14 +0800 From: Shameer Kolothum To: , , CC: , , , , , , , , , Subject: [PATCH v3 02/10] iommu/dma: Introduce generic helper to retrieve RMR info Date: Tue, 20 Apr 2021 10:27:43 +0200 Message-ID: <20210420082751.1829-3-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 Reserved Memory Regions(RMR) associated with an IOMMU may be described either through ACPI tables or DT in systems with devices that require a unity mapping or bypass for those regions in IOMMU drivers. Introduce a generic interface so that IOMMU drivers can retrieve and set up necessary mappings. Signed-off-by: Shameer Kolothum --- drivers/iommu/dma-iommu.c | 33 +++++++++++++++++++++++++++++++++ include/linux/dma-iommu.h | 8 ++++++++ include/linux/iommu.h | 19 +++++++++++++++++++ 3 files changed, 60 insertions(+) -- 2.17.1 Reported-by: kernel test robot Reported-by: kernel test robot Reported-by: kernel test robot diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index af765c813cc8..86a1e48b1fe8 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -191,6 +191,39 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list) } EXPORT_SYMBOL(iommu_dma_get_resv_regions); +/** + * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated + * with a given IOMMU + * @iommu_fwnode: fwnode associated with IOMMU + * @list: RMR list to be populated + * + */ +int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *list) +{ + return 0; +} +EXPORT_SYMBOL(iommu_dma_get_rmrs); + +struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid, + u32 flags) +{ + struct iommu_rmr *rmr; + + rmr = kzalloc(sizeof(*rmr), GFP_KERNEL); + if (!rmr) + return NULL; + + INIT_LIST_HEAD(&rmr->list); + rmr->base_address = base; + rmr->length = length; + rmr->sid = sid; + rmr->flags = flags; + + return rmr; +} +EXPORT_SYMBOL(iommu_dma_alloc_rmr); + static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie, phys_addr_t start, phys_addr_t end) { diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index 706b68d1359b..beb84c4fe5b1 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -40,6 +40,9 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list); void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, struct iommu_domain *domain); +int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list); +struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid, u32 flags); + #else /* CONFIG_IOMMU_DMA */ struct iommu_domain; @@ -86,5 +89,10 @@ static inline void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, { } +int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list); +{ + return 0; +} + #endif /* CONFIG_IOMMU_DMA */ #endif /* __DMA_IOMMU_H */ diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 5e7fe519430a..fb8820c40144 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -595,6 +595,25 @@ struct iommu_sva { struct device *dev; }; +/** + * struct iommu_rmr - Reserved Memory Region details per IOMMU + * @list: Linked list pointers to hold RMR region info + * @base_address: base address of Reserved Memory Region + * @length: length of memory region + * @sid: associated stream id + * @flags: flags that apply to the RMR node + */ +struct iommu_rmr { + struct list_head list; + phys_addr_t base_address; + u64 length; + u32 sid; + u32 flags; +}; + +/* RMR Remap permitted */ +#define IOMMU_RMR_REMAP_PERMITTED (1 << 0) + int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops); void iommu_fwspec_free(struct device *dev);