From patchwork Thu Aug 3 09:56:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 710817 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 A1C47C0015E for ; Thu, 3 Aug 2023 09:56:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232221AbjHCJ4M (ORCPT ); Thu, 3 Aug 2023 05:56:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232454AbjHCJ4L (ORCPT ); Thu, 3 Aug 2023 05:56:11 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A625C126 for ; Thu, 3 Aug 2023 02:56:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1691056569; x=1722592569; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=FT5GYeCVzZJLD1WIflhrjEaraza87Xt8K3wEyR9PAEU=; b=M2aJ63fr1/xxtrOiEG7Q1mXQohOt3uBAVwmJd1d5FDxy6ljp1utOj1UK 8sXuxSyJ3ixblo9KFVoYvx9g0YAFDnmllku1f56+IBUB5DsOtHVltBDJb y//VH7Egj78j7/VyDdkDYKjz3c/t7veRYhHYVNwHXmtu82IX9mXMUvwnV 7gWEcXd+7HrX9pejQ6sZaTBngAZ7eR+tjjFwXtmES8UrovOsqf1iwvK+s 9ewY0+xYb2XThwMiG2V4DM8+xhwj//GtC8ayqPKpNN5FMgw2KLM3Cp09t 5TN4koBnckp8A6vuZUUA8c/uUqtoT61FnIpMX9dKH5/GyZk8+xYVZTkI/ A==; X-IronPort-AV: E=McAfee;i="6600,9927,10790"; a="456207787" X-IronPort-AV: E=Sophos;i="6.01,251,1684825200"; d="scan'208";a="456207787" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Aug 2023 02:56:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10790"; a="819582206" X-IronPort-AV: E=Sophos;i="6.01,251,1684825200"; d="scan'208";a="819582206" Received: from black.fi.intel.com ([10.237.72.28]) by FMSMGA003.fm.intel.com with ESMTP; 03 Aug 2023 02:56:07 -0700 Received: by black.fi.intel.com (Postfix, from userid 1001) id 7E5CF13F; Thu, 3 Aug 2023 12:56:18 +0300 (EEST) From: Mika Westerberg To: linux-usb@vger.kernel.org Cc: Yehezkel Bernat , Michael Jamet , Lukas Wunner , Andreas Noever , Mika Westerberg Subject: [PATCH 1/3] thunderbolt: Log a warning if device links are not found Date: Thu, 3 Aug 2023 12:56:16 +0300 Message-Id: <20230803095618.56001-1-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The software connection manager needs the device links in order to establish the tunnels before the native protocols so log a warning if they are not found. Signed-off-by: Mika Westerberg --- drivers/thunderbolt/acpi.c | 18 +++++++++++++----- drivers/thunderbolt/tb.c | 24 +++++++++++++++++------- drivers/thunderbolt/tb.h | 4 ++-- 3 files changed, 32 insertions(+), 14 deletions(-) diff --git a/drivers/thunderbolt/acpi.c b/drivers/thunderbolt/acpi.c index 38fefd0e5268..c9b6bb46111c 100644 --- a/drivers/thunderbolt/acpi.c +++ b/drivers/thunderbolt/acpi.c @@ -12,7 +12,7 @@ #include "tb.h" static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data, - void **return_value) + void **ret) { struct acpi_device *adev = acpi_fetch_acpi_dev(handle); struct fwnode_handle *fwnode; @@ -84,6 +84,7 @@ static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data, if (link) { dev_dbg(&nhi->pdev->dev, "created link from %s\n", dev_name(&pdev->dev)); + *(bool *)ret = true; } else { dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n", dev_name(&pdev->dev)); @@ -104,22 +105,29 @@ static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data, * Goes over ACPI namespace finding tunneled ports that reference to * @nhi ACPI node. For each reference a device link is added. The link * is automatically removed by the driver core. + * + * Returns %true if at least one link was created. */ -void tb_acpi_add_links(struct tb_nhi *nhi) +bool tb_acpi_add_links(struct tb_nhi *nhi) { acpi_status status; + bool ret = false; if (!has_acpi_companion(&nhi->pdev->dev)) - return; + return false; /* * Find all devices that have usb4-host-controller interface * property that references to this NHI. */ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 32, - tb_acpi_add_link, NULL, nhi, NULL); - if (ACPI_FAILURE(status)) + tb_acpi_add_link, NULL, nhi, (void **)&ret); + if (ACPI_FAILURE(status)) { dev_warn(&nhi->pdev->dev, "failed to enumerate tunneled ports\n"); + return false; + } + + return ret; } /** diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 3fb4553a6442..dd0a1ef8cf12 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -2368,12 +2368,13 @@ static const struct tb_cm_ops tb_cm_ops = { * downstream ports and the NHI so that the device core will make sure * NHI is resumed first before the rest. */ -static void tb_apple_add_links(struct tb_nhi *nhi) +static bool tb_apple_add_links(struct tb_nhi *nhi) { struct pci_dev *upstream, *pdev; + bool ret; if (!x86_apple_machine) - return; + return false; switch (nhi->pdev->device) { case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: @@ -2382,26 +2383,27 @@ static void tb_apple_add_links(struct tb_nhi *nhi) case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI: break; default: - return; + return false; } upstream = pci_upstream_bridge(nhi->pdev); while (upstream) { if (!pci_is_pcie(upstream)) - return; + return false; if (pci_pcie_type(upstream) == PCI_EXP_TYPE_UPSTREAM) break; upstream = pci_upstream_bridge(upstream); } if (!upstream) - return; + return false; /* * For each hotplug downstream port, create add device link * back to NHI so that PCIe tunnels can be re-established after * sleep. */ + ret = false; for_each_pci_bridge(pdev, upstream->subordinate) { const struct device_link *link; @@ -2417,11 +2419,14 @@ static void tb_apple_add_links(struct tb_nhi *nhi) if (link) { dev_dbg(&nhi->pdev->dev, "created link from %s\n", dev_name(&pdev->dev)); + ret = true; } else { dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n", dev_name(&pdev->dev)); } } + + return ret; } struct tb *tb_probe(struct tb_nhi *nhi) @@ -2448,8 +2453,13 @@ struct tb *tb_probe(struct tb_nhi *nhi) tb_dbg(tb, "using software connection manager\n"); - tb_apple_add_links(nhi); - tb_acpi_add_links(nhi); + /* + * Device links are needed to make sure we establish tunnels + * before the PCIe/USB stack is resumed so complain here if we + * found them missing. + */ + if (!tb_apple_add_links(nhi) && !tb_acpi_add_links(nhi)) + tb_warn(tb, "device links to tunneled native ports are missing!\n"); return tb; } diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 57a9b272cb94..d2a55ad2fd3e 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -1333,7 +1333,7 @@ static inline bool usb4_port_device_is_offline(const struct usb4_port *usb4) void tb_check_quirks(struct tb_switch *sw); #ifdef CONFIG_ACPI -void tb_acpi_add_links(struct tb_nhi *nhi); +bool tb_acpi_add_links(struct tb_nhi *nhi); bool tb_acpi_is_native(void); bool tb_acpi_may_tunnel_usb3(void); @@ -1346,7 +1346,7 @@ void tb_acpi_exit(void); int tb_acpi_power_on_retimers(struct tb_port *port); int tb_acpi_power_off_retimers(struct tb_port *port); #else -static inline void tb_acpi_add_links(struct tb_nhi *nhi) { } +static inline bool tb_acpi_add_links(struct tb_nhi *nhi) { return false; } static inline bool tb_acpi_is_native(void) { return true; } static inline bool tb_acpi_may_tunnel_usb3(void) { return true; }