From patchwork Wed Aug 10 18:35:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: William McVicker X-Patchwork-Id: 12940880 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 716C0C25B07 for ; Wed, 10 Aug 2022 18:36:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232835AbiHJSf5 (ORCPT ); Wed, 10 Aug 2022 14:35:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233582AbiHJSfy (ORCPT ); Wed, 10 Aug 2022 14:35:54 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A67BE5720D for ; Wed, 10 Aug 2022 11:35:53 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id v65-20020a626144000000b0052f89472f54so3444834pfb.11 for ; Wed, 10 Aug 2022 11:35:53 -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=uv8ak0kfVqp7yv0xyscnxE/AIYOJ9hrsgPAz5hkx6v0=; b=K2Ilv/NLIJPQNt1VDFBArRwGT0aWo1Jm8oiRgST50kFGhBTSlT4RrRdyJvMWxO87dp O9KVMKGSVU/hT5a8L1WoGSouwVmKm0VkJmg/yXMpVT7SlW1KklL/nBVIXyYYNsEmI+j5 wIDzsy5pNUvjIVA6KGNhuQplNhROOZyfdnEdMgI/SSczI8yp/aRuQQQCrQcNCEMOgeZ/ xuobD3T//FAeh1Q0XbWxvKVIYkCrCQ/Di8JmpJaoACSwd9mFNRXkUZXR7M61s13NLtrh GzV+blARRmmohSrsuJO2lS3BWuD8TasATxwBGI2RM2P2e2eizLXrttU2P3EsVcxUAnVy XgeQ== 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=uv8ak0kfVqp7yv0xyscnxE/AIYOJ9hrsgPAz5hkx6v0=; b=V4usKTiws2fbRjL+hft9NSNNw3xdMCjB+V0CXDbNm1n/OLxYkvhrWXFu03vipyS/8d jxLEssvR60elJIT60lg0wXRMKbQfSf/0OFpSj9dKJ0IcwY9PAIw29nfSjjeDiJjQyBbe vosH0/nu6RJezeFrOoBEQanm+BvVg5k00IhWD7x9VDJMvX4BkRm0FOTV1IlsQ4bsqElS tXLPkx+cq7bQrFbxvdMW1q0abjOf3N1qyfCFt7GWeBi4ljPktHG6DSLtu6Y3kNS1RLXa /cREjS8dLKUde7MHdnoGZ6UTmzSyrHroclaFGA4lFgW17yzOjzuRiQHJqbkGyELIjRoN vnsQ== X-Gm-Message-State: ACgBeo3+J+R/mKlnj1tsaIoANSHt8x8oAVr+fBowZN3Z8SWxTeeJ5Enr RH25D8UDE/fBc05Z3mzoS2gllo/TIRSdwOMVS7g= X-Google-Smtp-Source: AA6agR5obXIExAhqkoSR0o/c5ibnWODXMfJdOKNqvgARm+4EQBilI3PzRBErb77178JnLMQJgOGeKogjUN9YkfMjZ8c= X-Received: from wmcvicker.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5ebe]) (user=willmcvicker job=sendgmr) by 2002:a17:902:da8f:b0:16f:e43:efda with SMTP id j15-20020a170902da8f00b0016f0e43efdamr28615371plx.164.1660156553111; Wed, 10 Aug 2022 11:35:53 -0700 (PDT) Date: Wed, 10 Aug 2022 18:35:35 +0000 In-Reply-To: <20220810183536.1630940-1-willmcvicker@google.com> Message-Id: <20220810183536.1630940-3-willmcvicker@google.com> Mime-Version: 1.0 References: <20220810183536.1630940-1-willmcvicker@google.com> X-Mailer: git-send-email 2.37.1.559.g78731f0fdb-goog Subject: [PATCH v2 2/2] PCI: dwc: add support for 64-bit MSI target address From: Will McVicker To: Jingoo Han , Gustavo Pimentel , Lorenzo Pieralisi , Rob Herring , " =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= " , Bjorn Helgaas , Will McVicker Cc: kernel-team@android.com, Vidya Sagar , kernel test robot , "Isaac J . Manjarres" , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Since not all devices require a 32-bit MSI address, add support to the PCIe host driver to allow setting the DMA mask to 64-bits. This allows kernels to disable ZONE_DMA32 and bounce buffering (swiotlb) without risking not being able to get a 32-bit address during DMA allocation. Basically, in the slim chance that there are no 32-bit allocations available, the current PCIe host driver will fail to allocate the msi_msg page due to a DMA address overflow (seen in [1]). With this patch, the PCIe driver can advertise 64-bit support via it's MSI capabilities to hint to the PCIe host driver to set the DMA mask to 64-bits. [1] https://lore.kernel.org/all/Yo0soniFborDl7+C@google.com/ Reported-by: kernel test robot Signed-off-by: Will McVicker Reviewed-by: Rob Herring --- drivers/pci/controller/dwc/pcie-designware-host.c | 14 ++++++++++++-- drivers/pci/controller/dwc/pcie-designware.c | 9 +++++++++ drivers/pci/controller/dwc/pcie-designware.h | 1 + 3 files changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 8f2222f51671..2b9b63489415 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -338,6 +338,8 @@ static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp) struct platform_device *pdev = to_platform_device(dev); int ret; u32 ctrl, num_ctrls; + bool msi_64b = false; + u16 msi_capabilities; for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) pp->irq_mask[ctrl] = ~0; @@ -375,9 +377,17 @@ static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp) dw_chained_msi_isr, pp); } - ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + msi_capabilities = dw_pcie_msi_capabilities(pci); + if (msi_capabilities & PCI_MSI_FLAGS_ENABLE) + msi_64b = msi_capabilities & PCI_MSI_FLAGS_64BIT ? true : false; + + dev_dbg(dev, "Setting MSI DMA mask to %s-bit.\n", + msi_64b ? "64" : "32"); + ret = dma_set_mask_and_coherent(dev, msi_64b ? + DMA_BIT_MASK(64) : DMA_BIT_MASK(32)); if (ret) - dev_warn(dev, "Failed to set DMA mask to 32-bit. Devices with only 32-bit MSI support may not work properly\n"); + dev_warn(dev, "Failed to set DMA mask to %s-bit.\n", + msi_64b ? "64" : "32"); pp->msi_page = dma_alloc_coherent(dev, PAGE_SIZE, &pp->msi_data, GFP_KERNEL); diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index c6725c519a47..8ed402307d7f 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -82,6 +82,15 @@ u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) } EXPORT_SYMBOL_GPL(dw_pcie_find_capability); +u16 dw_pcie_msi_capabilities(struct dw_pcie *pci) +{ + u8 offset; + + offset = dw_pcie_find_capability(pci, PCI_CAP_ID_MSI); + return dw_pcie_readw_dbi(pci, offset + PCI_MSI_FLAGS); +} +EXPORT_SYMBOL_GPL(dw_pcie_msi_capabilities); + static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, u8 cap) { diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 09b887093a84..4631e26ba6c5 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -333,6 +333,7 @@ void dw_pcie_version_detect(struct dw_pcie *pci); u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap); +u16 dw_pcie_msi_capabilities(struct dw_pcie *pci); int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val);