From patchwork Thu Jan 19 01:35:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhang, Tianfei" X-Patchwork-Id: 13107255 X-Patchwork-Delegate: bhelgaas@google.com 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 791C9C677F1 for ; Thu, 19 Jan 2023 01:31:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229634AbjASBbm (ORCPT ); Wed, 18 Jan 2023 20:31:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229862AbjASBai (ORCPT ); Wed, 18 Jan 2023 20:30:38 -0500 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F73D2C647; Wed, 18 Jan 2023 17:28:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674091700; x=1705627700; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=/fMvxq4ANCu2cW712GMMTIFRFtohqCRfRXkl6DAzvos=; b=WZrJQnrCS1MIiO+78TrLWPEZ3C8AYcw1GsQxe0iI0Wg/jvq2jLoumIuH zVpgWpcho3tJW2X/e6mL3e4gCj0LBGiafIB8CsQ8XaGjPqbKg8QqRLwsS VRinlaM68VMEvITZ2ZgdOItXGu8Vz3QiKS0OjNgWuJU9HB7zXXu0cXRZp WXpLDhDInnX1R9vq4u+Fa3FLp0/NZW0AEU54qVHfBm+Db/9NmprX1TjzL i4E7A6BwzdE/P9QbIMX8yZ+JbGTNyd+2hiaDHPSHQMrPEVfv+CbFJgyg5 2cF3Cw/V/djB68rliwVzHTEknmUFnAcFmw5F5U2MjxVqLBrrYoz83/9Wy g==; X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="322847462" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="322847462" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jan 2023 17:28:20 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="767995625" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="767995625" Received: from unknown (HELO fedora.sh.intel.com) ([10.238.175.104]) by fmsmga002.fm.intel.com with ESMTP; 18 Jan 2023 17:28:14 -0800 From: Tianfei Zhang To: bhelgaas@google.com, linux-pci@vger.kernel.org, linux-fpga@vger.kernel.org, lukas@wunner.de, kabel@kernel.org, mani@kernel.org, pali@kernel.org, mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com, jgg@ziepe.ca, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, dan.j.williams@intel.com, keescook@chromium.org, rafael@kernel.org, russell.h.weight@intel.com, corbet@lwn.net, linux-doc@vger.kernel.org, ilpo.jarvinen@linux.intel.com, lee@kernel.org, gregkh@linuxfoundation.org, matthew.gerlach@linux.intel.com Cc: Tianfei Zhang Subject: [PATCH v1 03/12] PCI: hotplug: add and expose link disable API Date: Wed, 18 Jan 2023 20:35:53 -0500 Message-Id: <20230119013602.607466-4-tianfei.zhang@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230119013602.607466-1-tianfei.zhang@intel.com> References: <20230119013602.607466-1-tianfei.zhang@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org When a PCIe-based FPGA card is reprogrammed, it temporarily disappears from the PCIe bus. This needs to be managed to avoid PCIe errors while the device is not present. Also, re-probing and rescan the PCI devices must be performed after loading the new images. Export functions from pciehp driver necessary for disable and enable the PCI link of a PCI hotplug bridge. Signed-off-by: Tianfei Zhang --- drivers/pci/hotplug/pciehp.h | 1 + drivers/pci/hotplug/pciehp_hpc.c | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index c7f455a3b08f..8b58d0e84644 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -195,6 +195,7 @@ int pciehp_get_raw_indicator_status(struct hotplug_slot *h_slot, u8 *status); int pciehp_slot_reset(struct pcie_device *dev); int pciehp_link_enable(struct controller *ctrl); +int pciehp_link_disable(struct controller *ctrl); static inline const char *slot_name(struct controller *ctrl) { diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 11e4bc58aec0..729546c0c1f9 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -353,6 +353,12 @@ int pciehp_link_enable(struct controller *ctrl) } EXPORT_SYMBOL_NS_GPL(pciehp_link_enable, PCIEHP); +int pciehp_link_disable(struct controller *ctrl) +{ + return __pciehp_link_set(ctrl, false); +} +EXPORT_SYMBOL_NS_GPL(pciehp_link_disable, PCIEHP); + int pciehp_get_raw_indicator_status(struct hotplug_slot *hotplug_slot, u8 *status) {