From nobody Sat Apr 11 17:07:16 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D9E6C19F2D for ; Tue, 9 Aug 2022 18:02:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344359AbiHISCP (ORCPT ); Tue, 9 Aug 2022 14:02:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344367AbiHISBr (ORCPT ); Tue, 9 Aug 2022 14:01:47 -0400 Received: from mail-pj1-x1049.google.com (mail-pj1-x1049.google.com [IPv6:2607:f8b0:4864:20::1049]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8371A26AF3 for ; Tue, 9 Aug 2022 11:01:03 -0700 (PDT) Received: by mail-pj1-x1049.google.com with SMTP id q6-20020a17090a1b0600b001f558bbb924so5102475pjq.3 for ; Tue, 09 Aug 2022 11:01:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc; bh=JMRo2ixMHb3JOzogb+sGCIpZ2H1yxkZ6X1ZhcAfiIwI=; b=LT0t1bsNi8ymDwfrg5OhBBNiiN6VxO9/fwn7AvNHMR/6BvRV9oxpUACqkfuuJu5N07 JwWFYys2GuTgOEr3E7lIRNpoQ6NyHZFOZxsupWY+Y1Yr0XRfNylilp/WjbfFgu6T30E4 l2HD4L+hAzGNBKuezkfRGtO1GGi2Pjgk0Hg2kDN5c4U1otuRHvXorqAcsqsrW5CBXtI7 3/Krs46z/tZ622sMN7iocrknfmHuHLF8ci5dTAVb4E6VpTzsrTR/ncbGmlo/BX8kQYRK n76LkKXT29nExez07OJW/SsqIMRyYJMpkzei6bpllpoKHHNqEj95xWjZLLTnXFdvHbDP bVAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc; bh=JMRo2ixMHb3JOzogb+sGCIpZ2H1yxkZ6X1ZhcAfiIwI=; b=syyWiFa+uF6h03/CqiXIZ8Mq2DEflgQaTTDoX3ur0PXw/PZgSD77O3VlHXH1xsWacZ dpFUfaa9aE633zDheldOZ0vQjX2FfHvC8lnjp8hw2/R019Z30zY33apdetLWSGXyKZfh Mie//jrdc6WxA8A3X9tWVjBj0hgDgjPsYLc2QbZh+bMLctjFLrz9eoHQUVLK/aPu+loi y0kIQwUmwDbJxYg9dYf+nGHPQWzIJ/aVYIuNa2JEQ8Oi09JM5QJS0qSJCkdSNTQn996T aks/f+vGg1EIiR53ecrTL0HOmIxnySMuX6Zwn3CtldMTz7i/GvtdttOh51yO4/H5mjOX xxrw== X-Gm-Message-State: ACgBeo2e+0GdtvK0u7tx84SFo9nglDy9lhA6XirjH/kXJ4ikxKNMJ/b4 9B6UVe1HkBdhnIdIt8Eh8brRwYDidHiVYZf2Cs0= X-Google-Smtp-Source: AA6agR7Cc5DUEBvfdyA5rq0jFSyZ+4r/tBcU9vcCcTtzlfHE3q1eOu8BjALWVEzjrnX+XR7J3lm6bhmIuXswNRqDLM4= X-Received: from wmcvicker.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5ebe]) (user=willmcvicker job=sendgmr) by 2002:a17:902:cece:b0:16e:ea30:6287 with SMTP id d14-20020a170902cece00b0016eea306287mr24265895plg.104.1660068062910; Tue, 09 Aug 2022 11:01:02 -0700 (PDT) Date: Tue, 9 Aug 2022 18:00:49 +0000 In-Reply-To: <20220809180051.1063653-1-willmcvicker@google.com> Message-Id: <20220809180051.1063653-2-willmcvicker@google.com> Mime-Version: 1.0 References: <20220809180051.1063653-1-willmcvicker@google.com> X-Mailer: git-send-email 2.37.1.559.g78731f0fdb-goog Subject: [PATCH v1 1/2] PCI: dwc: drop dependency on ZONE_DMA32 From: Will McVicker To: Jingoo Han , Gustavo Pimentel , Lorenzo Pieralisi , Rob Herring , "=?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?=" , Bjorn Helgaas , Will McVicker Cc: kernel-team@android.com, Vidya Sagar , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Re-work the msi_msg DMA allocation logic to use dma_alloc_coherent() which uses the coherent DMA mask to try and return an allocation within the DMA mask limits. This allows kernel configurations that disable ZONE_DMA32 to continue supporting a 32-bit DMA mask. Without this patch, the PCIe host device will fail to probe when ZONE_DMA32 is disabled. Fixes: 35797e672ff0 ("PCI: dwc: Fix MSI msi_msg DMA mapping") Signed-off-by: Will McVicker --- .../pci/controller/dwc/pcie-designware-host.c | 28 +++++++++---------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pc= i/controller/dwc/pcie-designware-host.c index 7746f94a715f..0cfc3c098f13 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -272,9 +272,9 @@ static void dw_pcie_free_msi(struct dw_pcie_rp *pp) struct dw_pcie *pci =3D to_dw_pcie_from_pp(pp); struct device *dev =3D pci->dev; =20 - dma_unmap_page(dev, pp->msi_data, PAGE_SIZE, DMA_FROM_DEVICE); - if (pp->msi_page) - __free_page(pp->msi_page); + dma_free_coherent(dev, PAGE_SIZE, pp->msi_page, pp->msi_data); + pp->msi_data =3D 0; + pp->msi_page =3D NULL; } } =20 @@ -375,22 +375,22 @@ static int dw_pcie_msi_host_init(struct dw_pcie_rp *p= p) dw_chained_msi_isr, pp); } =20 - ret =3D dma_set_mask(dev, DMA_BIT_MASK(32)); + ret =3D dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); if (ret) dev_warn(dev, "Failed to set DMA mask to 32-bit. Devices with only 32-bi= t MSI support may not work properly\n"); =20 - pp->msi_page =3D alloc_page(GFP_DMA32); - pp->msi_data =3D dma_map_page(dev, pp->msi_page, 0, - PAGE_SIZE, DMA_FROM_DEVICE); - ret =3D dma_mapping_error(dev, pp->msi_data); - if (ret) { - dev_err(pci->dev, "Failed to map MSI data\n"); - __free_page(pp->msi_page); - pp->msi_page =3D NULL; + pp->msi_page =3D dma_alloc_coherent(dev, PAGE_SIZE, &pp->msi_data, + GFP_KERNEL); + if (!pp->msi_page || dma_mapping_error(dev, pp->msi_data)) { + dev_err(dev, "Failed to alloc and map MSI data\n"); + if (pp->msi_page) { + dma_free_coherent(dev, PAGE_SIZE, pp->msi_page, + pp->msi_data); + pp->msi_page =3D NULL; + } pp->msi_data =3D 0; dw_pcie_free_msi(pp); - - return ret; + return -ENOMEM; } =20 return 0; --=20 2.37.1.559.g78731f0fdb-goog