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=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 6F6BFC433E1 for ; Mon, 17 Aug 2020 23:41:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C2D82065D for ; Mon, 17 Aug 2020 23:41:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IiQth7+0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726628AbgHQXlg (ORCPT ); Mon, 17 Aug 2020 19:41:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54034 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726746AbgHQXlX (ORCPT ); Mon, 17 Aug 2020 19:41:23 -0400 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F33C6C061389 for ; Mon, 17 Aug 2020 16:41:22 -0700 (PDT) Received: by mail-qk1-x743.google.com with SMTP id i20so2460261qkk.8 for ; Mon, 17 Aug 2020 16:41:22 -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=y7/RxrEgFbiJeIJ6odgzjv0QMFDSvXInIkcTRZMw0eA=; b=IiQth7+0e0kRkPXTuZa3ekMLeZ9wkT9s3Y+ETQFOXeUnYOuhb72kf9D0pkNi/MxoLv y0fF0bfFWEckv1n1Sw1dBF2Vo5kwVhU8rMuQ01UAMhYYLzt+NzzqSB5QEu4/hwayw9Av zB5PCYtduyvUIau6q2mGsAyIAboxD2LdWU2C9KCxddPBcQtiYo0Z+G/cJSqIEmR+YmkT /dDMr61Bpazjzj29QTR+S0sTPiH/U+Cg1J2USuYEeF3KFJ0xXvB1wnLK+vsX0wioIF7j mhhuxf5PPc6D5sk+e/E36iKhKOEYANPapwK2KXySAGcN7UZfSxl+dDuxC62sje3dLaLZ Eulw== 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=y7/RxrEgFbiJeIJ6odgzjv0QMFDSvXInIkcTRZMw0eA=; b=epvOgnqlyBCQkEINGcxL8G3cE+sKQuVObfyR+BmbkF7cgVcaYozk8sM1V7qg0wxGRK /cKffEo2BXknLMd92F7OSilu/LCioJHnN1vPjwZm3MrhkssV/mn4nvTCBorJ1mgCfoy9 FyxRamW5wzRjTUxTqYVn89orNOodgcHJyN/oAtTambmcS9DTySYE3BbxKCg6+l/xknl1 BJHZdMxd+zVqxy/RbyQ7EWztBKulYVEUzxKEgbronX4SMFzLrqX9sLAdBODOUE6j1/oj o+u6n3Uqpz10CoTGVpdd69y1lkGHlyHXapx3igR2IccP+yGbUH441Eo9QKIdIl5VGppj DTxg== X-Gm-Message-State: AOAM533wwHciBTrp3d4QIx3AXBEm/TINo/ZYzIw9K5PcRZ/LoFOY6oQj Bpd6Zf2x5+ECtpp6dDOxHXE= X-Google-Smtp-Source: ABdhPJw1kObRxpNNPRo2Qby2q/D7S9MPv9OG18YyKtca1zlLVXdtJqtPEqBmEvx+aezgJrJhNuF5zA== X-Received: by 2002:a37:a293:: with SMTP id l141mr15380301qke.222.1597707682020; Mon, 17 Aug 2020 16:41:22 -0700 (PDT) Received: from LeoBras.ibmuc.com ([177.35.193.93]) by smtp.gmail.com with ESMTPSA id w58sm22342868qth.95.2020.08.17.16.41.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Aug 2020 16:41:21 -0700 (PDT) From: Leonardo Bras To: Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Alexey Kardashevskiy , Christophe Leroy , Leonardo Bras , Joel Stanley , Thiago Jung Bauermann , Ram Pai , Brian King , Murilo Fossa Vicentini , David Dai Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 07/10] powerpc/pseries/iommu: Allow DDW windows starting at 0x00 Date: Mon, 17 Aug 2020 20:40:30 -0300 Message-Id: <20200817234033.442511-8-leobras.c@gmail.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200817234033.442511-1-leobras.c@gmail.com> References: <20200817234033.442511-1-leobras.c@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org 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 --- arch/powerpc/platforms/pseries/iommu.c | 30 ++++++++++++-------------- 1 file changed, 14 insertions(+), 16 deletions(-) diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index fcdefcc0f365..4031127c9537 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -852,24 +852,25 @@ static void remove_ddw(struct device_node *np, bool remove_prop) np, ret); } -static u64 find_existing_ddw(struct device_node *pdn) +static bool find_existing_ddw(struct device_node *pdn, u64 *dma_addr) { 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); + found = true; break; } } spin_unlock(&direct_window_list_lock); - return dma_addr; + return found; } static struct direct_window *ddw_list_add(struct device_node *pdn, @@ -1131,15 +1132,15 @@ static void reset_dma_window(struct pci_dev *dev, struct device_node *par_dn) * 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, ret; struct ddw_query_response query; struct ddw_create_response create; int page_shift; - u64 dma_addr, max_addr; + u64 max_addr; struct device_node *dn; u32 ddw_avail[DDW_APPLICABLE_SIZE]; struct direct_window *window; @@ -1150,8 +1151,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) mutex_lock(&direct_window_init_mutex); - dma_addr = find_existing_ddw(pdn); - if (dma_addr != 0) + if (find_existing_ddw(pdn, &dev->dev.archdata.dma_offset)) goto out_unlock; /* @@ -1292,7 +1292,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) goto out_free_window; } - dma_addr = be64_to_cpu(ddwprop->dma_base); + dev->dev.archdata.dma_offset = be64_to_cpu(ddwprop->dma_base); goto out_unlock; out_free_window: @@ -1309,6 +1309,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) kfree(win64->name); kfree(win64->value); kfree(win64); + win64 = NULL; out_failed: if (default_win_removed) @@ -1322,7 +1323,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) out_unlock: mutex_unlock(&direct_window_init_mutex); - return dma_addr; + return win64; } static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev) @@ -1401,11 +1402,8 @@ 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; } -- 2.25.4