From patchwork Tue Jul 7 04:54:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajat Jain X-Patchwork-Id: 1324093 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20161025 header.b=mbuPeda4; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4B198Y0pwxz9sSd for ; Tue, 7 Jul 2020 14:54:37 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727995AbgGGEy0 (ORCPT ); Tue, 7 Jul 2020 00:54:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726805AbgGGEyZ (ORCPT ); Tue, 7 Jul 2020 00:54:25 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B40D4C08C5DF for ; Mon, 6 Jul 2020 21:54:25 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id k127so40978931ybk.11 for ; Mon, 06 Jul 2020 21:54:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=0UHQXwzDKyMu6ppfAQOSS2nfBfwyJFJV0IFTM7eBtHc=; b=mbuPeda4ki/cHDFtnKQDlCuCbLE0xSTgPWloy4eFe7VQiaS3G+99cfKvEHAvZAcb6Y 0cA5zzaH5RNQHKt/XB7LTPihfMtcqjJtfMBwkU92FemUS2j4OVoB6WOKUfB/XNIVm478 giUcdXYNGT1LivYGVF9KbNwkDgDxipqmbDKFxJoRvbpU407J5HW3vE+ch5NusT2eL59a hc1oH7YeyUHd4DSB8AqHzx4WGcYs8h0UzQx72QfR/Auy96+xrCzgkVM2KWs5ae9i1b5c 4h5AzPw4FFRUjBxHNNAO9q22Uzs/uoC04Cj0tRp1HBCFl9b90VAoqktzurTJ6ff64aIg 7+Vg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=0UHQXwzDKyMu6ppfAQOSS2nfBfwyJFJV0IFTM7eBtHc=; b=Pl13k1AcMH88XbOzxyhiy0Jm6iXi5Cyt+4JFYgWjNtoLaaYDfBPU03krpMrTfDS8Gi UmkU64ZkUiP1wcfjASzix3ogzPjbwMyNB5gvM/gPTC8+IHCjeU7UiD7PG8m0KlfxNfaQ OEKb++xWVd9M0gzdWZjC6AqnlKKlMaMhbOIXiIx3gJtsuNCbV5xnzjsutoiB4dONObgV hJJ0ui/X8o/SmyD7Fvlhu4I9tFFwCCo1b3jK+S5LGQvLjF7Jwwb9LIKB/Re7bu3sxJZv sVjo0Zg1Go8t8nErIfOdH1gweptIaIzwYc99C6Ptc0GQHTjmxOzU61J0meh/t5LN2gVT vkXg== X-Gm-Message-State: AOAM533U6i6jB71f1aNzEmYaa/TWniPOyHtWqQjYU0jReZJ1XRF6Gtd2 b6mMZzdFoIVZeKaULdtWr0klo9oX4UxU X-Google-Smtp-Source: ABdhPJytpJCxnkH48p8xQGQuL09UJdhYOPapD/u+vN56YH26lg0WUXI8fCMsEhH7InqIRO+J3Fp2tbnMOj0z X-Received: by 2002:a25:9341:: with SMTP id g1mr20825866ybo.171.1594097664887; Mon, 06 Jul 2020 21:54:24 -0700 (PDT) Date: Mon, 6 Jul 2020 21:54:16 -0700 In-Reply-To: <20200707045418.3517076-1-rajatja@google.com> Message-Id: <20200707045418.3517076-2-rajatja@google.com> Mime-Version: 1.0 References: <20200707045418.3517076-1-rajatja@google.com> X-Mailer: git-send-email 2.27.0.212.ge8ba1cc988-goog Subject: [PATCH v3 2/4] PCI: Keep the ACS capability offset in device From: Rajat Jain To: David Woodhouse , Lu Baolu , Joerg Roedel , Bjorn Helgaas , "Rafael J. Wysocki" , Len Brown , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Raj Ashok , lalithambika.krishnakumar@intel.com, Mika Westerberg , Jean-Philippe Brucker , Prashant Malani , Benson Leung , Todd Broch , Alex Levin , Mattias Nissler , Rajat Jain , Bernie Keany , Aaron Durbin , Diego Rivas , Duncan Laurie , Furquan Shaikh , Jesse Barnes , Christian Kellner , Alex Williamson , Greg Kroah-Hartman , oohall@gmail.com, Saravana Kannan , Suzuki K Poulose , Arnd Bergmann , Heikki Krogerus Cc: Rajat Jain Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Currently ACS capabiity is being looked up at a number of places. Read and store it once at bootup so that it can be used by all later. Signed-off-by: Rajat Jain --- v3: fix commit log, remove forward declation of static function v2: Commit log cosmetic changes drivers/pci/p2pdma.c | 2 +- drivers/pci/pci.c | 20 ++++++++++++++++---- drivers/pci/pci.h | 2 +- drivers/pci/probe.c | 2 +- drivers/pci/quirks.c | 8 ++++---- include/linux/pci.h | 1 + 6 files changed, 24 insertions(+), 11 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index e8e444eeb1cd2..f29a48f8fa594 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -253,7 +253,7 @@ static int pci_bridge_has_acs_redir(struct pci_dev *pdev) int pos; u16 ctrl; - pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS); + pos = pdev->acs_cap; if (!pos) return 0; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index eec625f0e594e..73a8627822140 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -831,7 +831,7 @@ static void pci_disable_acs_redir(struct pci_dev *dev) if (!pci_dev_specific_disable_acs_redir(dev)) return; - pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); + pos = dev->acs_cap; if (!pos) { pci_warn(dev, "cannot disable ACS redirect for this hardware as it does not have ACS capabilities\n"); return; @@ -857,7 +857,7 @@ static void pci_std_enable_acs(struct pci_dev *dev) u16 cap; u16 ctrl; - pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); + pos = dev->acs_cap; if (!pos) return; @@ -883,7 +883,7 @@ static void pci_std_enable_acs(struct pci_dev *dev) * pci_enable_acs - enable ACS if hardware support it * @dev: the PCI device */ -void pci_enable_acs(struct pci_dev *dev) +static void pci_enable_acs(struct pci_dev *dev) { if (!pci_acs_enable) goto disable_acs_redir; @@ -3362,7 +3362,7 @@ static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags) int pos; u16 cap, ctrl; - pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS); + pos = pdev->acs_cap; if (!pos) return false; @@ -3487,6 +3487,18 @@ bool pci_acs_path_enabled(struct pci_dev *start, return true; } +/** + * pci_acs_init - Initialize ACS if hardware supports it + * @dev: the PCI device + */ +void pci_acs_init(struct pci_dev *dev) +{ + dev->acs_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); + + if (dev->acs_cap) + pci_enable_acs(dev); +} + /** * pci_rebar_find_pos - find position of resize ctrl reg for BAR * @pdev: PCI device diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 6d3f758671064..12fb79fbe29d3 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -532,7 +532,7 @@ static inline resource_size_t pci_resource_alignment(struct pci_dev *dev, return resource_alignment(res); } -void pci_enable_acs(struct pci_dev *dev); +void pci_acs_init(struct pci_dev *dev); #ifdef CONFIG_PCI_QUIRKS int pci_dev_specific_acs_enabled(struct pci_dev *dev, u16 acs_flags); int pci_dev_specific_enable_acs(struct pci_dev *dev); diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2f66988cea257..6d87066a5ecc5 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2390,7 +2390,7 @@ static void pci_init_capabilities(struct pci_dev *dev) pci_ats_init(dev); /* Address Translation Services */ pci_pri_init(dev); /* Page Request Interface */ pci_pasid_init(dev); /* Process Address Space ID */ - pci_enable_acs(dev); /* Enable ACS P2P upstream forwarding */ + pci_acs_init(dev); /* Access Control Services */ pci_ptm_init(dev); /* Precision Time Measurement */ pci_aer_init(dev); /* Advanced Error Reporting */ pci_dpc_init(dev); /* Downstream Port Containment */ diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 812bfc32ecb82..b341628e47527 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4653,7 +4653,7 @@ static int pci_quirk_intel_spt_pch_acs(struct pci_dev *dev, u16 acs_flags) if (!pci_quirk_intel_spt_pch_acs_match(dev)) return -ENOTTY; - pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); + pos = dev->acs_cap; if (!pos) return -ENOTTY; @@ -4961,7 +4961,7 @@ static int pci_quirk_enable_intel_spt_pch_acs(struct pci_dev *dev) if (!pci_quirk_intel_spt_pch_acs_match(dev)) return -ENOTTY; - pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); + pos = dev->acs_cap; if (!pos) return -ENOTTY; @@ -4988,7 +4988,7 @@ static int pci_quirk_disable_intel_spt_pch_acs_redir(struct pci_dev *dev) if (!pci_quirk_intel_spt_pch_acs_match(dev)) return -ENOTTY; - pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); + pos = dev->acs_cap; if (!pos) return -ENOTTY; @@ -5355,7 +5355,7 @@ int pci_idt_bus_quirk(struct pci_bus *bus, int devfn, u32 *l, int timeout) bool found; struct pci_dev *bridge = bus->self; - pos = pci_find_ext_capability(bridge, PCI_EXT_CAP_ID_ACS); + pos = bridge->acs_cap; /* Disable ACS SV before initial config reads */ if (pos) { diff --git a/include/linux/pci.h b/include/linux/pci.h index 34c1c4f45288f..0ca39042507ce 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -486,6 +486,7 @@ struct pci_dev { #ifdef CONFIG_PCI_P2PDMA struct pci_p2pdma *p2pdma; #endif + u16 acs_cap; /* ACS Capability offset */ phys_addr_t rom; /* Physical address if not from BAR */ size_t romlen; /* Length if not from BAR */ char *driver_override; /* Driver name to force a match */