From patchwork Thu Oct 24 17:12:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 11210413 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D2054112C for ; Thu, 24 Oct 2019 17:12:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B052820650 for ; Thu, 24 Oct 2019 17:12:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="gtqnnE4R" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405899AbfJXRMn (ORCPT ); Thu, 24 Oct 2019 13:12:43 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:48758 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2405931AbfJXRMm (ORCPT ); Thu, 24 Oct 2019 13:12:42 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 9526343B0D; Thu, 24 Oct 2019 17:12:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1571937160; x=1573751561; bh=7LK5j1jdEBLIX2jiqRm58ICC7aVyOZzOenw 2Gw9gTSA=; b=gtqnnE4Ry6yu+htTvQwLZWM8c+2+3hPyIIy7LlPS7TK/t2ozV62 y5Ts5++ZhXMeiar6dq19hc7mvdMU3sFoODdMKuNQ85+OsYxdDupKNXfkGr2Agwpv uzAim+PBfw9VVQwKIwRqdyhLKvx5IDabVzergkOvVQPxllGa09HClX2s= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rwaLFxmMzZHi; Thu, 24 Oct 2019 20:12:40 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 8DA9843130; Thu, 24 Oct 2019 20:12:39 +0300 (MSK) Received: from NB-148.yadro.com (172.17.15.136) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Thu, 24 Oct 2019 20:12:39 +0300 From: Sergey Miroshnichenko To: , CC: Bjorn Helgaas , , Sergey Miroshnichenko Subject: [PATCH v6 02/30] PCI: Enable bridge's I/O and MEM access for hotplugged devices Date: Thu, 24 Oct 2019 20:12:00 +0300 Message-ID: <20191024171228.877974-3-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191024171228.877974-1-s.miroshnichenko@yadro.com> References: <20191024171228.877974-1-s.miroshnichenko@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.136] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The PCI_COMMAND_IO and PCI_COMMAND_MEMORY bits of the bridge must be updated not only when enabling the bridge for the first time, but also if a hotplugged device requests these types of resources. Originally these bits were set by the pci_enable_device_flags() only, which exits early if the bridge is already pci_is_enabled(). So if the bridge was empty initially (an edge case), then hotplugged devices fail to IO/MEM. Signed-off-by: Sergey Miroshnichenko --- drivers/pci/pci.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 44d0d12c80cf..e85dc63c73fd 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1650,6 +1650,14 @@ static void pci_enable_bridge(struct pci_dev *dev) pci_enable_bridge(bridge); if (pci_is_enabled(dev)) { + int i, bars = 0; + + for (i = PCI_BRIDGE_RESOURCES; i < DEVICE_COUNT_RESOURCE; i++) { + if (dev->resource[i].flags & (IORESOURCE_MEM | IORESOURCE_IO)) + bars |= (1 << i); + } + do_pci_enable_device(dev, bars); + if (!dev->is_busmaster) pci_set_master(dev); mutex_unlock(&dev->enable_mutex);