From patchwork Tue Aug 17 18:04:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ameynarkhede03 X-Patchwork-Id: 12441845 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=-15.8 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,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 13376C4338F for ; Tue, 17 Aug 2021 18:05:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E829E60F11 for ; Tue, 17 Aug 2021 18:05:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232845AbhHQSFr (ORCPT ); Tue, 17 Aug 2021 14:05:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229918AbhHQSFq (ORCPT ); Tue, 17 Aug 2021 14:05:46 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9DD13C061764; Tue, 17 Aug 2021 11:05:13 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id e15so25714713plh.8; Tue, 17 Aug 2021 11:05:13 -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=64aDvN9oKekcubnbTh6hlBJyjfJ9jTD8l/UAKBhqJ40=; b=SeTrUriXHM4d+Vksu1xKcmwzC3t1Q6DWcjvPQM2j/919V+OGAhPi/D/cS3wZTt4oZv HK4VwileVCgHaSLaQ/iVwHyDspTFWdlzTzTP507oPko1nahHujIEq8d572r0btLNMA0z Sd2765GGzmWs5v1cx7+P4djf639sQS1ufoSeavaEr6OjnQKdS7PC2cx5YKvvAFiALeBN H8qM4VabJwICiDZIp7kDw2ydGxMJSxTpApd/0QTaFrfWvjL8ByAjS9KHFIR73n8uv/1n 5QJkkcpq2dOKV77fREvn2lBWh2wIFAaUBU/zTjk+RiuiYQ1tJilaqpaRK4C66XBffQk1 Hw3Q== 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=64aDvN9oKekcubnbTh6hlBJyjfJ9jTD8l/UAKBhqJ40=; b=A5GhczzgVxYX7wsAzfyQubYHQTqVLYoSuMX3MMlZNnb+8Z4Tk+3J0+AAdUOFp9kKkR nGZxdZUgfhY2HNiqCeweOaRiTwJa0vErTMXDPiW/5/Clj+9ZFDRZhEO5k0sRKTWVaJjO AFoOEUdIcAku5M6g6pYQkGuaoSmcmS0e4rJcjxVxXOR8dl4LzmPVkDN9Pptk9tDh99Nx muL5VeixudHe/mj7vxsmmI4W0j97OvdQUXw41evIA9rREMPKwsl7NSiEVxWdSqQ0SNwv kpEnpo7u+PY8Hd6ee4j9RKDHOWq3fqsS0UCmJV00V2DY2wrihUliOAtgcKcipgjHm4sL FHBg== X-Gm-Message-State: AOAM532TYDj9TgT8afGgd6jeOeQ9373fvi7835zOO0eI4iArlnbA496P aH9+P9JXYKqQ1b/pIpd3cHg= X-Google-Smtp-Source: ABdhPJy0N4ASmJ27LXenrrtRUjqvTnRNIN/lSd8Brtlc/l2l+7XCYo3vNnpuI3FuoQG28I3dGtNq9A== X-Received: by 2002:aa7:8b07:0:b029:3c7:c29f:9822 with SMTP id f7-20020aa78b070000b02903c7c29f9822mr4732765pfd.33.1629223513211; Tue, 17 Aug 2021 11:05:13 -0700 (PDT) Received: from localhost.localdomain ([103.248.31.158]) by smtp.googlemail.com with ESMTPSA id 65sm4065632pgi.12.2021.08.17.11.05.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 11:05:12 -0700 (PDT) From: Amey Narkhede To: Bjorn Helgaas Cc: alex.williamson@redhat.com, Raphael Norwitz , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, kw@linux.com, Shanker Donthineni , Sinan Kaya , Len Brown , "Rafael J . Wysocki" , Amey Narkhede Subject: [PATCH v16 1/9] PCI: Cache PCIe FLR capability Date: Tue, 17 Aug 2021 23:34:52 +0530 Message-Id: <20210817180500.1253-2-ameynarkhede03@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210817180500.1253-1-ameynarkhede03@gmail.com> References: <20210817180500.1253-1-ameynarkhede03@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add a new member called devcap in struct pci_dev for caching the device capabilities to avoid reading PCI_EXP_DEVCAP multiple times. Refactor pcie_has_flr() to use cached device capabilities. Signed-off-by: Amey Narkhede Reviewed-by: Raphael Norwitz --- drivers/pci/pci.c | 6 ++---- drivers/pci/probe.c | 5 +++-- include/linux/pci.h | 1 + 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 452351025..1fafd05ca 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -31,6 +31,7 @@ #include #include #include +#include #include "pci.h" DEFINE_MUTEX(pci_slot_mutex); @@ -4620,13 +4621,10 @@ EXPORT_SYMBOL(pci_wait_for_pending_transaction); */ bool pcie_has_flr(struct pci_dev *dev) { - u32 cap; - if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) return false; - pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); - return cap & PCI_EXP_DEVCAP_FLR; + return FIELD_GET(PCI_EXP_DEVCAP_FLR, dev->devcap) == 1; } EXPORT_SYMBOL_GPL(pcie_has_flr); diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 3a62d09b8..df3f9db6e 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "pci.h" #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ @@ -1497,8 +1498,8 @@ void set_pcie_port_type(struct pci_dev *pdev) pdev->pcie_cap = pos; pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); pdev->pcie_flags_reg = reg16; - pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); - pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; + pci_read_config_dword(pdev, pos + PCI_EXP_DEVCAP, &pdev->devcap); + pdev->pcie_mpss = FIELD_GET(PCI_EXP_DEVCAP_PAYLOAD, pdev->devcap); parent = pci_upstream_bridge(pdev); if (!parent) diff --git a/include/linux/pci.h b/include/linux/pci.h index c20211e59..697b1f085 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -333,6 +333,7 @@ struct pci_dev { struct rcec_ea *rcec_ea; /* RCEC cached endpoint association */ struct pci_dev *rcec; /* Associated RCEC device */ #endif + u32 devcap; /* PCIe device capabilities */ u8 pcie_cap; /* PCIe capability offset */ u8 msi_cap; /* MSI capability offset */ u8 msix_cap; /* MSI-X capability offset */