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=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 A40D1C433E0 for ; Tue, 9 Feb 2021 06:26:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B59764E3B for ; Tue, 9 Feb 2021 06:26:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230300AbhBIG0g (ORCPT ); Tue, 9 Feb 2021 01:26:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230107AbhBIGXT (ORCPT ); Tue, 9 Feb 2021 01:23:19 -0500 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50DB3C06121C for ; Mon, 8 Feb 2021 22:22:27 -0800 (PST) Received: by mail-pl1-x62e.google.com with SMTP id 8so9151659plc.10 for ; Mon, 08 Feb 2021 22:22:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=CxLFhhx42ZtNAWWPxxTC2YTMXHtyxeDPJClSNQiYoYc=; b=FOjc62yoUhk/LYUclkinZZ4zDvKpeGo1x74CjLhqDxql67icfdZqyBr48BDMmzkMqR tA+flicJ3qCGmrksh4BzQ5Am4hl3t7sFnye0tmSkf0JhPfYSoJrQn4ouvbgIPDxqcZT9 22NHFR6mKzgKsRHbHqBZhVhBnyuYHLbdeoeHw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=CxLFhhx42ZtNAWWPxxTC2YTMXHtyxeDPJClSNQiYoYc=; b=rBbXmx90D241PzKshJUNvwO2FqWLHvX7oVNbA8MUyOBJkgKSTRuB+2QvOnMOiZs+5w uFfmVYvhU25T4/g761AF9AQoNt4PX+AO+TdpT7s60NJUZHmspcwcVjAVsMKHi28/q6Ok tFqfxpuc/vOPlogV95xlLB8cjme2AVsaivqZZ0FZdqC8bGMq9DSjkppDZUte0pd11TQT sG4pGGBmhMKNmxCFj4xsysuxxT6XkQu2ncrq+JGQqFaHUuoWj9lczfE0SPFst2vjYzHu +qOWgCAY/Fwcv5UiLm4ZddrWYRPErGvUSWVmE6VkuTvd/cGsnl4wzSQDuD2VveI+KOWA qa6w== X-Gm-Message-State: AOAM530+AGbse4+o1awPI9NwP8Q7z6s51zAvsM0YYkpXmYD0NW/n0Xnx jAI6iYuBu5nya+Cuq0dry50LCw== X-Google-Smtp-Source: ABdhPJwDHlCULV4tTgyY9CKwnf/NbNTRufsz7Pi36U/uwqUNeuQrkhr5EaPoNzogQlT61PzYunqO5A== X-Received: by 2002:a17:90a:3188:: with SMTP id j8mr2559404pjb.53.1612851746343; Mon, 08 Feb 2021 22:22:26 -0800 (PST) Received: from localhost ([2401:fa00:1:10:a106:46e1:a999:81df]) by smtp.gmail.com with UTF8SMTPSA id np7sm1080411pjb.10.2021.02.08.22.22.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Feb 2021 22:22:25 -0800 (PST) From: Claire Chang To: Rob Herring , mpe@ellerman.id.au, Joerg Roedel , Will Deacon , Frank Rowand , Konrad Rzeszutek Wilk , boris.ostrovsky@oracle.com, jgross@suse.com, Christoph Hellwig , Marek Szyprowski Cc: benh@kernel.crashing.org, paulus@samba.org, "list@263.net:IOMMU DRIVERS" , sstabellini@kernel.org, Robin Murphy , grant.likely@arm.com, xypron.glpk@gmx.de, Thierry Reding , mingo@kernel.org, bauerman@linux.ibm.com, peterz@infradead.org, Greg KH , Saravana Kannan , "Rafael J . Wysocki" , heikki.krogerus@linux.intel.com, Andy Shevchenko , Randy Dunlap , Dan Williams , Bartosz Golaszewski , linux-devicetree , lkml , linuxppc-dev@lists.ozlabs.org, xen-devel@lists.xenproject.org, Nicolas Boichat , Jim Quinlan , Claire Chang Subject: [PATCH v4 06/14] swiotlb: Add restricted DMA pool Date: Tue, 9 Feb 2021 14:21:23 +0800 Message-Id: <20210209062131.2300005-7-tientzu@chromium.org> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog In-Reply-To: <20210209062131.2300005-1-tientzu@chromium.org> References: <20210209062131.2300005-1-tientzu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add the initialization function to create restricted DMA pools from matching reserved-memory nodes. Signed-off-by: Claire Chang --- include/linux/device.h | 4 ++ kernel/dma/swiotlb.c | 94 +++++++++++++++++++++++++++++++++++++++++- 2 files changed, 97 insertions(+), 1 deletion(-) diff --git a/include/linux/device.h b/include/linux/device.h index 7619a84f8ce4..08d440627b93 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -415,6 +415,7 @@ struct dev_links_info { * @dma_pools: Dma pools (if dma'ble device). * @dma_mem: Internal for coherent mem override. * @cma_area: Contiguous memory area for dma allocations + * @dev_swiotlb: Internal for swiotlb override. * @archdata: For arch-specific additions. * @of_node: Associated device tree node. * @fwnode: Associated device node supplied by platform firmware. @@ -517,6 +518,9 @@ struct device { #ifdef CONFIG_DMA_CMA struct cma *cma_area; /* contiguous memory area for dma allocations */ +#endif +#ifdef CONFIG_DMA_RESTRICTED_POOL + struct swiotlb *dev_swiotlb; #endif /* arch specific additions */ struct dev_archdata archdata; diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index dc37951c6924..3a17451c5981 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -39,6 +39,13 @@ #ifdef CONFIG_DEBUG_FS #include #endif +#ifdef CONFIG_DMA_RESTRICTED_POOL +#include +#include +#include +#include +#include +#endif #include #include @@ -75,7 +82,8 @@ enum swiotlb_force swiotlb_force; * range check to see if the memory was in fact allocated by this * API. * @nslabs: The number of IO TLB blocks (in groups of 64) between @start and - * @end. This is command line adjustable via setup_io_tlb_npages. + * @end. For default swiotlb, this is command line adjustable via + * setup_io_tlb_npages. * @used: The number of used IO TLB block. * @list: The free list describing the number of free entries available * from each index. @@ -780,3 +788,87 @@ static int __init swiotlb_create_default_debugfs(void) late_initcall(swiotlb_create_default_debugfs); #endif + +#ifdef CONFIG_DMA_RESTRICTED_POOL +static int rmem_swiotlb_device_init(struct reserved_mem *rmem, + struct device *dev) +{ + struct swiotlb *swiotlb = rmem->priv; + int ret; + + if (dev->dev_swiotlb) + return -EBUSY; + + /* Since multiple devices can share the same pool, the private data, + * swiotlb struct, will be initialized by the first device attached + * to it. + */ + if (!swiotlb) { + swiotlb = kzalloc(sizeof(*swiotlb), GFP_KERNEL); + if (!swiotlb) + return -ENOMEM; +#ifdef CONFIG_ARM + unsigned long pfn = PHYS_PFN(reme->base); + + if (!PageHighMem(pfn_to_page(pfn))) { + ret = -EINVAL; + goto cleanup; + } +#endif /* CONFIG_ARM */ + + ret = swiotlb_init_tlb_pool(swiotlb, rmem->base, rmem->size); + if (ret) + goto cleanup; + + rmem->priv = swiotlb; + } + +#ifdef CONFIG_DEBUG_FS + swiotlb_create_debugfs(swiotlb, rmem->name, default_swiotlb.debugfs); +#endif /* CONFIG_DEBUG_FS */ + + dev->dev_swiotlb = swiotlb; + + return 0; + +cleanup: + kfree(swiotlb); + + return ret; +} + +static void rmem_swiotlb_device_release(struct reserved_mem *rmem, + struct device *dev) +{ + if (!dev) + return; + +#ifdef CONFIG_DEBUG_FS + debugfs_remove_recursive(dev->dev_swiotlb->debugfs); +#endif /* CONFIG_DEBUG_FS */ + dev->dev_swiotlb = NULL; +} + +static const struct reserved_mem_ops rmem_swiotlb_ops = { + .device_init = rmem_swiotlb_device_init, + .device_release = rmem_swiotlb_device_release, +}; + +static int __init rmem_swiotlb_setup(struct reserved_mem *rmem) +{ + unsigned long node = rmem->fdt_node; + + if (of_get_flat_dt_prop(node, "reusable", NULL) || + of_get_flat_dt_prop(node, "linux,cma-default", NULL) || + of_get_flat_dt_prop(node, "linux,dma-default", NULL) || + of_get_flat_dt_prop(node, "no-map", NULL)) + return -EINVAL; + + rmem->ops = &rmem_swiotlb_ops; + pr_info("Reserved memory: created device swiotlb memory pool at %pa, size %ld MiB\n", + &rmem->base, (unsigned long)rmem->size / SZ_1M); + return 0; +} + +RESERVEDMEM_OF_DECLARE(dma, "restricted-dma-pool", rmem_swiotlb_setup); +#endif /* CONFIG_DMA_RESTRICTED_POOL */ -- 2.30.0.478.g8a0d178c01-goog