From patchwork Fri Jul 26 09:28:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huacai Chen X-Patchwork-Id: 1965232 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:45e3:2400::1; helo=sv.mirrors.kernel.org; envelope-from=linux-pci+bounces-10830-incoming=patchwork.ozlabs.org@vger.kernel.org; receiver=patchwork.ozlabs.org) Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org [IPv6:2604:1380:45e3:2400::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4WVjB32pfrz1ybY for ; Fri, 26 Jul 2024 19:28:59 +1000 (AEST) Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 068AB283FAC for ; Fri, 26 Jul 2024 09:28:58 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 862A4176AA2; Fri, 26 Jul 2024 09:28:57 +0000 (UTC) X-Original-To: linux-pci@vger.kernel.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6E4E1A3D for ; Fri, 26 Jul 2024 09:28:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721986137; cv=none; b=nhSVQ0pF8pKUeA5HiS6l+Oz45VNAF6jOrR4kg+0oX4Zo/TbLoj1f94nA9ghfA++Lo0NDQnhiGSKfbP9IPYeiIRUq6jeM+o2yYM6QMH/vaimMpm34OaZiVtBbYS/4htyhxqTu5vKm6tEtKU3saDsNDRS5GlcRKwkyfHMASw0MV8Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721986137; c=relaxed/simple; bh=6xGypHD6rib3GM9huVk1wxq1KqCd98TxkhX6q3gKh2c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=rqHAxIBGWqfvOd+gg1fIOLpErAIJm8jRINjgnsL3vjwcZ5zkIhKo8fxM1ofqNwmrGHhICdG0Jy/IQkElWjPL4sirm8Qlv5kuoF6qaEhpxTOIs4At2rgNuT3tvTbM4UXFPQUMaau2pB/sYbypI9qvkSF5uxaa3Zw7xaCYLbuPjiw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FEBAC32782; Fri, 26 Jul 2024 09:28:54 +0000 (UTC) From: Huacai Chen To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, Jianmin Lv , Xuefeng Li , Huacai Chen , Jiaxun Yang , Huacai Chen , Ming Wang Subject: [PATCH] PCI: Prevent LS7A Bus Master clearing on kexec Date: Fri, 26 Jul 2024 17:28:29 +0800 Message-ID: <20240726092829.2042624-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This is similar to commit 62b6dee1b44aa23b39355 ("PCI/portdrv: Prevent LS7A Bus Master clearing on shutdown"), which prevents LS7A Bus Master clearing on kexec. Only skip Bus Master clearing on bridges because endpoint devices still need it. Signed-off-by: Ming Wang Signed-off-by: Huacai Chen --- drivers/pci/pci-driver.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index f412ef73a6e4..b7d3a4d8532f 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -517,7 +517,7 @@ static void pci_device_shutdown(struct device *dev) * If it is not a kexec reboot, firmware will hit the PCI * devices with big hammer and stop their DMA any way. */ - if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) + if (kexec_in_progress && !pci_is_bridge(pci_dev) && (pci_dev->current_state <= PCI_D3hot)) pci_clear_master(pci_dev); }