From patchwork Fri Jun 19 14:33:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 223746 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 23307C433DF for ; Fri, 19 Jun 2020 16:32:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 04B0B217D9 for ; Fri, 19 Jun 2020 16:32:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592584355; bh=d6fqHaRRMf3tGaHV6yly6LqbkKUS6wkDcL5VvOuKf0Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cjfSn6wbiATrjd4aGmbKcBUi3SHb6Lzq0sy79jkdorU+KZ7nsE9JLdQ7fRYMoPFZT SJQv4v4O6QCECumAbt56ZLgYapMnZZqUs+/qi4GSEtKV5BNUNsO0+q7RY75t5smA3g JBRXkTcxttss9kM/aZ7g8DHDa9vgtct6dPmZYfG8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389516AbgFSQce (ORCPT ); Fri, 19 Jun 2020 12:32:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:45764 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389507AbgFSOvy (ORCPT ); Fri, 19 Jun 2020 10:51:54 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 61DC2217D8; Fri, 19 Jun 2020 14:51:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592578314; bh=d6fqHaRRMf3tGaHV6yly6LqbkKUS6wkDcL5VvOuKf0Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YvU3Tg/wvXM/Mat9h1xFmEPnB49pRZD3VtWhb4/X6aEFVj1ZWbwUX65Mw6Le82ZVu JDkEWqZ0DI35s+6u06IStUWx4rySjojHB9ETdzbSVxoXjfyGZtsha3e1Fq4SbO5KbR 90f9apWGeUVWVk6O901G9j3iYa1ILjNVHpkTFpos= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bjorn Helgaas , Logan Gunthorpe , Alex Williamson , Sasha Levin Subject: [PATCH 4.14 158/190] PCI: Unify ACS quirk desired vs provided checking Date: Fri, 19 Jun 2020 16:33:23 +0200 Message-Id: <20200619141641.637957150@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141633.446429600@linuxfoundation.org> References: <20200619141633.446429600@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bjorn Helgaas [ Upstream commit 7cf2cba43f15c74bac46dc5f0326805d25ef514d ] Most of the ACS quirks have a similar pattern of: acs_flags &= ~( ); return acs_flags ? 0 : 1; Pull this out into a helper function to simplify the quirks slightly. The helper function is also a convenient place for comments about what the list of ACS controls means. No functional change intended. Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe Reviewed-by: Alex Williamson Signed-off-by: Sasha Levin --- drivers/pci/quirks.c | 67 +++++++++++++++++++++++++++++--------------- 1 file changed, 45 insertions(+), 22 deletions(-) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 0472e69833c8..5f26c170315c 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4236,6 +4236,24 @@ static void quirk_chelsio_T5_disable_root_port_attributes(struct pci_dev *pdev) DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID, quirk_chelsio_T5_disable_root_port_attributes); +/* + * pci_acs_ctrl_enabled - compare desired ACS controls with those provided + * by a device + * @acs_ctrl_req: Bitmask of desired ACS controls + * @acs_ctrl_ena: Bitmask of ACS controls enabled or provided implicitly by + * the hardware design + * + * Return 1 if all ACS controls in the @acs_ctrl_req bitmask are included + * in @acs_ctrl_ena, i.e., the device provides all the access controls the + * caller desires. Return 0 otherwise. + */ +static int pci_acs_ctrl_enabled(u16 acs_ctrl_req, u16 acs_ctrl_ena) +{ + if ((acs_ctrl_req & acs_ctrl_ena) == acs_ctrl_req) + return 1; + return 0; +} + /* * AMD has indicated that the devices below do not support peer-to-peer * in any system where they are found in the southbridge with an AMD @@ -4279,7 +4297,7 @@ static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags) /* Filter out flags not applicable to multifunction */ acs_flags &= (PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_EC | PCI_ACS_DT); - return acs_flags & ~(PCI_ACS_RR | PCI_ACS_CR) ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, PCI_ACS_RR | PCI_ACS_CR); #else return -ENODEV; #endif @@ -4317,9 +4335,8 @@ static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags) * hardware implements and enables equivalent ACS functionality for * these flags. */ - acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); - - return acs_flags ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, + PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); } static int pci_quirk_xgene_acs(struct pci_dev *dev, u16 acs_flags) @@ -4329,9 +4346,8 @@ static int pci_quirk_xgene_acs(struct pci_dev *dev, u16 acs_flags) * transactions with others, allowing masking out these bits as if they * were unimplemented in the ACS capability. */ - acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); - - return acs_flags ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, + PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); } /* @@ -4383,17 +4399,16 @@ static bool pci_quirk_intel_pch_acs_match(struct pci_dev *dev) return false; } -#define INTEL_PCH_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) - static int pci_quirk_intel_pch_acs(struct pci_dev *dev, u16 acs_flags) { if (!pci_quirk_intel_pch_acs_match(dev)) return -ENOTTY; if (dev->dev_flags & PCI_DEV_FLAGS_ACS_ENABLED_QUIRK) - acs_flags &= ~(INTEL_PCH_ACS_FLAGS); + return pci_acs_ctrl_enabled(acs_flags, + PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); - return acs_flags ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, 0); } /* @@ -4408,9 +4423,8 @@ static int pci_quirk_intel_pch_acs(struct pci_dev *dev, u16 acs_flags) */ static int pci_quirk_qcom_rp_acs(struct pci_dev *dev, u16 acs_flags) { - acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); - - return acs_flags ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, + PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); } /* @@ -4493,7 +4507,7 @@ static int pci_quirk_intel_spt_pch_acs(struct pci_dev *dev, u16 acs_flags) pci_read_config_dword(dev, pos + INTEL_SPT_ACS_CTRL, &ctrl); - return acs_flags & ~ctrl ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, ctrl); } static int pci_quirk_mf_endpoint_acs(struct pci_dev *dev, u16 acs_flags) @@ -4507,10 +4521,9 @@ static int pci_quirk_mf_endpoint_acs(struct pci_dev *dev, u16 acs_flags) * perform peer-to-peer with other functions, allowing us to mask out * these bits as if they were unimplemented in the ACS capability. */ - acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR | - PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT); - - return acs_flags ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, + PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR | + PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT); } static int pci_quirk_rciep_acs(struct pci_dev *dev, u16 acs_flags) @@ -4535,9 +4548,8 @@ static int pci_quirk_brcm_acs(struct pci_dev *dev, u16 acs_flags) * Allow each Root Port to be in a separate IOMMU group by masking * SV/RR/CR/UF bits. */ - acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); - - return acs_flags ? 0 : 1; + return pci_acs_ctrl_enabled(acs_flags, + PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); } static const struct pci_dev_acs_enabled { @@ -4636,6 +4648,17 @@ static const struct pci_dev_acs_enabled { { 0 } }; +/* + * pci_dev_specific_acs_enabled - check whether device provides ACS controls + * @dev: PCI device + * @acs_flags: Bitmask of desired ACS controls + * + * Returns: + * -ENOTTY: No quirk applies to this device; we can't tell whether the + * device provides the desired controls + * 0: Device does not provide all the desired controls + * >0: Device provides all the controls in @acs_flags + */ int pci_dev_specific_acs_enabled(struct pci_dev *dev, u16 acs_flags) { const struct pci_dev_acs_enabled *i;