From patchwork Sat Sep 4 02:20:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 507323 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 F3386C433FE for ; Sat, 4 Sep 2021 02:20:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8AFC60FE6 for ; Sat, 4 Sep 2021 02:20:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236264AbhIDCVl (ORCPT ); Fri, 3 Sep 2021 22:21:41 -0400 Received: from mga11.intel.com ([192.55.52.93]:3753 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231389AbhIDCVl (ORCPT ); Fri, 3 Sep 2021 22:21:41 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10096"; a="216417485" X-IronPort-AV: E=Sophos;i="5.85,267,1624345200"; d="scan'208";a="216417485" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2021 19:20:40 -0700 X-IronPort-AV: E=Sophos;i="5.85,267,1624345200"; d="scan'208";a="447819801" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2021 19:20:40 -0700 Subject: [PATCH 1/6] cxl/acpi: Do not add DSDT disabled ACPI0016 host bridge ports From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Alison Schofield , stable@vger.kernel.org, Jonathan Cameron , ben.widawsky@intel.com, Jonathan.Cameron@huawei.com Date: Fri, 03 Sep 2021 19:20:39 -0700 Message-ID: <163072203957.2250120.2178685721061002124.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <163072203373.2250120.8373702699578427249.stgit@dwillia2-desk3.amr.corp.intel.com> References: <163072203373.2250120.8373702699578427249.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alison Schofield During CXL ACPI probe, host bridge ports are discovered by scanning the ACPI0017 root port for ACPI0016 host bridge devices. The scan matches on the hardware id of "ACPI0016". An issue occurs when an ACPI0016 device is defined in the DSDT yet disabled on the platform. Attempts by the cxl_acpi driver to add host bridge ports using a disabled device fails, and the entire cxl_acpi probe fails. The DSDT table includes an _STA method that sets the status and the ACPI subsystem has checks available to examine it. One such check is in the acpi_pci_find_root() path. Move the call to acpi_pci_find_root() to the matching function to prevent this issue when adding either upstream or downstream ports. Suggested-by: Dan Williams Signed-off-by: Alison Schofield Fixes: 7d4b5ca2e2cb ("cxl/acpi: Add downstream port data to cxl_port instances") Cc: Reviewed-by: Jonathan Cameron Signed-off-by: Dan Williams --- drivers/cxl/acpi.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 8ae89273f58e..54e9d4d2cf5f 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -243,6 +243,9 @@ static struct acpi_device *to_cxl_host_bridge(struct device *dev) { struct acpi_device *adev = to_acpi_device(dev); + if (!acpi_pci_find_root(adev->handle)) + return NULL; + if (strcmp(acpi_device_hid(adev), "ACPI0016") == 0) return adev; return NULL; @@ -266,10 +269,6 @@ static int add_host_bridge_uport(struct device *match, void *arg) if (!bridge) return 0; - pci_root = acpi_pci_find_root(bridge->handle); - if (!pci_root) - return -ENXIO; - dport = find_dport_by_dev(root_port, match); if (!dport) { dev_dbg(host, "host bridge expected and not found\n"); @@ -282,6 +281,11 @@ static int add_host_bridge_uport(struct device *match, void *arg) return PTR_ERR(port); dev_dbg(host, "%s: add: %s\n", dev_name(match), dev_name(&port->dev)); + /* + * Note that this lookup already succeeded in + * to_cxl_host_bridge(), so no need to check for failure here + */ + pci_root = acpi_pci_find_root(bridge->handle); ctx = (struct cxl_walk_context){ .dev = host, .root = pci_root->bus,