From patchwork Mon May 10 09:50:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12247375 X-Patchwork-Delegate: bhelgaas@google.com 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=-19.4 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, 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 36BE3C43461 for ; Mon, 10 May 2021 09:51:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0ED686147E for ; Mon, 10 May 2021 09:51:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231143AbhEJJwo (ORCPT ); Mon, 10 May 2021 05:52:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58018 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231150AbhEJJw0 (ORCPT ); Mon, 10 May 2021 05:52:26 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7605FC061760 for ; Mon, 10 May 2021 02:51:14 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id t2-20020a17090ae502b029015b0fbfbc50so9745140pjy.3 for ; Mon, 10 May 2021 02:51:14 -0700 (PDT) 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=N3P9GLK7vHKhYVQQtJseEAxm9BpujcOrU5/c0rsEVEk=; b=Y7aOu5/1TjGJ39Q6KlGygdgKwH9kbvC5j2KTJY6W4XTdOExKpGYjoeXyBJiXgd/KYk KzSpnP+ON6ZMnZKtG68AQfgatZrpSEM8rt3qhHBX67wSb4snRTMym5W+JAqIFz3C1rDu rEn+A4sHCgc1HrIPZtrVf2hBqqnA1o60c7EF4= 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=N3P9GLK7vHKhYVQQtJseEAxm9BpujcOrU5/c0rsEVEk=; b=kheQZHmw2V/i5LpmLkHbByh9qFpYOidkwG97R0yvkrAC70yBAXIJwFzTrvJr0/NxkV zHorWQ1dYk/SQ/OcTtMc78h2dpmx+xUMUbZemvmtCMOVan1XNqkG5Qdf0vf/Z6PblqwV FiG6631OdqHLjkI3lGvaf0GGXk5H8wvtpW3qcclpUgRCPVrODBTXDQpOY4x7D2tYLHnC iGgWCZtl0bD4HhmTvA8lpm2X909znSG9bSxKpGqg1+PtAUmlxMkmg5E4M4aHbKFeCoQ1 vohTMIbLUUIRcToy44OJeIBqWLFKz5wPCiG5wefDvl1BlgByLF/+BF86SoEsTiivnGGm JUfw== X-Gm-Message-State: AOAM53300BY8CSO1c6ELjGQHg50uEbCWC8Q1C+rU6K6RnhBz/8Pxuc+g NLnQsX+qmehU+5vM2rgUFSkTdA== X-Google-Smtp-Source: ABdhPJx/+mqX+1PPw1d6WrMopD8tcfP0qxrVaW6dh7H0TOwQsbO/ZVrG7imWQ0Lmzh0hiACiE2GhCg== X-Received: by 2002:a17:902:f203:b029:ee:e32f:2a28 with SMTP id m3-20020a170902f203b02900eee32f2a28mr22959818plc.45.1620640274038; Mon, 10 May 2021 02:51:14 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:a524:abe8:94e3:5601]) by smtp.gmail.com with UTF8SMTPSA id 85sm10570175pge.92.2021.05.10.02.51.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 May 2021 02:51:13 -0700 (PDT) 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 , tfiga@chromium.org, bskeggs@redhat.com, bhelgaas@google.com, chris@chris-wilson.co.uk, tientzu@chromium.org, daniel@ffwll.ch, airlied@linux.ie, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, jxgao@google.com, joonas.lahtinen@linux.intel.com, linux-pci@vger.kernel.org, maarten.lankhorst@linux.intel.com, matthew.auld@intel.com, nouveau@lists.freedesktop.org, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com Subject: [PATCH v6 04/15] swiotlb: Add restricted DMA pool initialization Date: Mon, 10 May 2021 17:50:15 +0800 Message-Id: <20210510095026.3477496-5-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.607.g51e8a6a459-goog In-Reply-To: <20210510095026.3477496-1-tientzu@chromium.org> References: <20210510095026.3477496-1-tientzu@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@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 +++ include/linux/swiotlb.h | 3 +- kernel/dma/swiotlb.c | 79 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 85 insertions(+), 1 deletion(-) diff --git a/include/linux/device.h b/include/linux/device.h index 38a2071cf776..4987608ea4ff 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -416,6 +416,7 @@ 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 + * @dma_io_tlb_mem: Internal for swiotlb io_tlb_mem override. * @archdata: For arch-specific additions. * @of_node: Associated device tree node. * @fwnode: Associated device node supplied by platform firmware. @@ -521,6 +522,9 @@ struct device { #ifdef CONFIG_DMA_CMA struct cma *cma_area; /* contiguous memory area for dma allocations */ +#endif +#ifdef CONFIG_DMA_RESTRICTED_POOL + struct io_tlb_mem *dma_io_tlb_mem; #endif /* arch specific additions */ struct dev_archdata archdata; diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 216854a5e513..03ad6e3b4056 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -72,7 +72,8 @@ extern 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. diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 858475bd6923..4ea027b75013 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 @@ -687,3 +694,75 @@ 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 io_tlb_mem *mem = rmem->priv; + unsigned long nslabs = rmem->size >> IO_TLB_SHIFT; + + if (dev->dma_io_tlb_mem) + return 0; + + /* Since multiple devices can share the same pool, the private data, + * io_tlb_mem struct, will be initialized by the first device attached + * to it. + */ + if (!mem) { + mem = kzalloc(struct_size(mem, slots, nslabs), GFP_KERNEL); + if (!mem) + return -ENOMEM; +#ifdef CONFIG_ARM + if (!PageHighMem(pfn_to_page(PHYS_PFN(rmem->base)))) { + kfree(mem); + return -EINVAL; + } +#endif /* CONFIG_ARM */ + swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, false); + + rmem->priv = mem; + +#ifdef CONFIG_DEBUG_FS + if (!debugfs_dir) + debugfs_dir = debugfs_create_dir("swiotlb", NULL); + + swiotlb_create_debugfs(mem, rmem->name, debugfs_dir); +#endif /* CONFIG_DEBUG_FS */ + } + + dev->dma_io_tlb_mem = mem; + + return 0; +} + +static void rmem_swiotlb_device_release(struct reserved_mem *rmem, + struct device *dev) +{ + if (dev) + dev->dma_io_tlb_mem = 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 */