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=-14.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLACK,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 DB02BC432BE for ; Tue, 17 Aug 2021 06:40:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C429260F5C for ; Tue, 17 Aug 2021 06:40:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238381AbhHQGlH (ORCPT ); Tue, 17 Aug 2021 02:41:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60922 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238432AbhHQGlD (ORCPT ); Tue, 17 Aug 2021 02:41:03 -0400 Received: from mail-qt1-x82b.google.com (mail-qt1-x82b.google.com [IPv6:2607:f8b0:4864:20::82b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77E96C0613A4 for ; Mon, 16 Aug 2021 23:40:28 -0700 (PDT) Received: by mail-qt1-x82b.google.com with SMTP id d9so16296870qty.12 for ; Mon, 16 Aug 2021 23:40:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=a2LhOT8wKXwFFKbj1q2vhWVrDkR6KFzmfHIVvRI42P8=; b=HCd7BbfbzjyuSQoAZBY0KXbca4qPV0s6Yn9+ktNA336FnJIGq3/rfhl6wo7WDrDMiX vLV9LJ2Ab7BNCx2BnEmj90YUuOJ7KhP+qGcIC0Qjh3q3x8joV1k5N2lx/84KjAOFDVYw llnhsznIlOY08zI3WvuSwiwWsT7nOpXV8+YXK7cQt7Io2qBkaVkwrNO9/qbN4+h4dfNg uvQWfqaXnPPV+YrfzeL9dDI9bvaYFudxQQJqz6BGST85a95uXUho/74BuBDknSWhwcV0 HqcUe+uva4TdnVSgR/sjvYtI37oqNwXdrPt6ztsQBqWnkyayFCLpc4dbYr+Bl2U+WndR N6Pg== 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=a2LhOT8wKXwFFKbj1q2vhWVrDkR6KFzmfHIVvRI42P8=; b=sdjOMK+ay2zMIosFoRJQZyKiTChxp5YI8cyDAF7XzbvnpXzkoJdEbOG5tIgw1X6AzM 1bYA/mmquvSE9OAXOTVCAXQvhLGDCgT51AiFhpUH0kTC7+PvoOA2XNmfoy7VJLkpYvPt aB1y0CtJ2/3+mc44Vk33psuKWBh3E6C8Y5w96phJIxB76GN1FQXL2KEYM/H9gWx2iUC0 YoMOn2Ma7gFyf9rJr17i78y7T2LmpXNYeP0Ii83vryVgyHzpRMEtqmrITaNBkTjcdTpw n4qn/sWHeSTwZ71zzVRtKY1bBeNdRvHnd5U6flwqDS1WKlP9bSdgrlNNtllH01DeDb9g jTuA== X-Gm-Message-State: AOAM532+5ayy4m7NqBOUcim0dKGZqgDCJe9824ch5o0pjCSbtNEVWZK7 n2/aZMLrJI/ZvyAopkWVtvM= X-Google-Smtp-Source: ABdhPJzTPnmO3ONGgzNpn00puAX0SOcGYaRn4jh7/kafHfY84xLNphrzfIIMPtJyZHOWESRjWskZFg== X-Received: by 2002:ac8:665a:: with SMTP id j26mr1639544qtp.173.1629182427741; Mon, 16 Aug 2021 23:40:27 -0700 (PDT) Received: from LeoBras.redhat.com ([2804:431:c7f0:30b2:5c9e:50:88f3:269a]) by smtp.gmail.com with ESMTPSA id c11sm526938qth.29.2021.08.16.23.40.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Aug 2021 23:40:27 -0700 (PDT) From: Leonardo Bras To: Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Leonardo Bras , Alexey Kardashevskiy , Frederic Barrat , David Gibson , Nicolin Chen , kernel test robot Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 05/11] powerpc/pseries/iommu: Allow DDW windows starting at 0x00 Date: Tue, 17 Aug 2021 03:39:23 -0300 Message-Id: <20210817063929.38701-6-leobras.c@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210817063929.38701-1-leobras.c@gmail.com> References: <20210817063929.38701-1-leobras.c@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org enable_ddw() currently returns the address of the DMA window, which is considered invalid if has the value 0x00. Also, it only considers valid an address returned from find_existing_ddw if it's not 0x00. Changing this behavior makes sense, given the users of enable_ddw() only need to know if direct mapping is possible. It can also allow a DMA window starting at 0x00 to be used. This will be helpful for using a DDW with indirect mapping, as the window address will be different than 0x00, but it will not map the whole partition. Signed-off-by: Leonardo Bras Reviewed-by: Alexey Kardashevskiy Reviewed-by: Frederic Barrat --- arch/powerpc/platforms/pseries/iommu.c | 36 +++++++++++++------------- 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 712d1667144a..b34b473bbdc1 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -853,25 +853,26 @@ static void remove_ddw(struct device_node *np, bool remove_prop) np, ret); } -static u64 find_existing_ddw(struct device_node *pdn, int *window_shift) +static bool find_existing_ddw(struct device_node *pdn, u64 *dma_addr, int *window_shift) { struct direct_window *window; const struct dynamic_dma_window_prop *direct64; - u64 dma_addr = 0; + bool found = false; spin_lock(&direct_window_list_lock); /* check if we already created a window and dupe that config if so */ list_for_each_entry(window, &direct_window_list, list) { if (window->device == pdn) { direct64 = window->prop; - dma_addr = be64_to_cpu(direct64->dma_base); + *dma_addr = be64_to_cpu(direct64->dma_base); *window_shift = be32_to_cpu(direct64->window_shift); + found = true; break; } } spin_unlock(&direct_window_list_lock); - return dma_addr; + return found; } static struct direct_window *ddw_list_new_entry(struct device_node *pdn, @@ -1161,20 +1162,20 @@ static int iommu_get_page_shift(u32 query_page_size) * pdn: the parent pe node with the ibm,dma_window property * Future: also check if we can remap the base window for our base page size * - * returns the dma offset for use by the direct mapped DMA code. + * returns true if can map all pages (direct mapping), false otherwise.. */ -static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) +static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn) { int len = 0, ret; int max_ram_len = order_base_2(ddw_memory_hotplug_max()); struct ddw_query_response query; struct ddw_create_response create; int page_shift; - u64 dma_addr; struct device_node *dn; u32 ddw_avail[DDW_APPLICABLE_SIZE]; struct direct_window *window; struct property *win64; + bool ddw_enabled = false; struct dynamic_dma_window_prop *ddwprop; struct failed_ddw_pdn *fpdn; bool default_win_removed = false; @@ -1186,9 +1187,10 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) mutex_lock(&direct_window_init_mutex); - dma_addr = find_existing_ddw(pdn, &len); - if (dma_addr != 0) + if (find_existing_ddw(pdn, &dev->dev.archdata.dma_offset, &len)) { + ddw_enabled = true; goto out_unlock; + } /* * If we already went through this for a previous function of @@ -1342,7 +1344,8 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) list_add(&window->list, &direct_window_list); spin_unlock(&direct_window_list_lock); - dma_addr = be64_to_cpu(ddwprop->dma_base); + dev->dev.archdata.dma_offset = be64_to_cpu(ddwprop->dma_base); + ddw_enabled = true; goto out_unlock; out_free_window: @@ -1374,10 +1377,10 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) * as RAM, then we failed to create a window to cover persistent * memory and need to set the DMA limit. */ - if (pmem_present && dma_addr && (len == max_ram_len)) - dev->dev.bus_dma_limit = dma_addr + (1ULL << len); + if (pmem_present && ddw_enabled && (len == max_ram_len)) + dev->dev.bus_dma_limit = dev->dev.archdata.dma_offset + (1ULL << len); - return dma_addr; + return ddw_enabled; } static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev) @@ -1456,11 +1459,8 @@ static bool iommu_bypass_supported_pSeriesLP(struct pci_dev *pdev, u64 dma_mask) break; } - if (pdn && PCI_DN(pdn)) { - pdev->dev.archdata.dma_offset = enable_ddw(pdev, pdn); - if (pdev->dev.archdata.dma_offset) - return true; - } + if (pdn && PCI_DN(pdn)) + return enable_ddw(pdev, pdn); return false; } -- 2.32.0