From patchwork Thu Oct 24 17:12:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 11210459 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 CDF531575 for ; Thu, 24 Oct 2019 17:12:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ABEDD21906 for ; Thu, 24 Oct 2019 17:12:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="Viyk7VPa" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436722AbfJXRM4 (ORCPT ); Thu, 24 Oct 2019 13:12:56 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:48816 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2436814AbfJXRMz (ORCPT ); Thu, 24 Oct 2019 13:12:55 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 1E2CB438CE; Thu, 24 Oct 2019 17:12:55 +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= 1571937174; x=1573751575; bh=2IGyeDgGJ6qusS98yQ3CmH65HU7DzXb7ja0 tqKXs9LI=; b=Viyk7VPaJtIdDmECs2lmFodI7riWdZrmew8Q8a5QFvpMyeYKLhz NHpeYOqkGPtYEc1bSzmPzRD+jakQGVA+Ep4pWq7Q84TBPTghPumPI3jhMY4A6uMe OgHKYjXk9lACcX+ZZKABuum6dlgdBv3ltjem5bbtWY1sWa806cru+kq0= 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 3FXMhiCyE9oV; Thu, 24 Oct 2019 20:12:54 +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 2F965437F3; Thu, 24 Oct 2019 20:12:44 +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 20:12:43 +0300 From: Sergey Miroshnichenko To: , CC: Bjorn Helgaas , , Sergey Miroshnichenko , Oliver O'Halloran , Sam Bobroff Subject: [PATCH v6 24/30] powerpc/powernv/pci: Suppress an EEH error when reading an empty slot Date: Thu, 24 Oct 2019 20:12:22 +0300 Message-ID: <20191024171228.877974-25-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 Reading an empty slot returns all ones, which triggers a false EEH error event on PowerNV. A rescan is performed after all the PEs have been unmapped, so the reserved PE index is used for unfreezing. CC: Oliver O'Halloran CC: Sam Bobroff Signed-off-by: Sergey Miroshnichenko --- arch/powerpc/platforms/powernv/pci.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c index ffd546cf9204..e1b45dc96474 100644 --- a/arch/powerpc/platforms/powernv/pci.c +++ b/arch/powerpc/platforms/powernv/pci.c @@ -768,9 +768,16 @@ static int pnv_pci_read_config(struct pci_bus *bus, *val = 0xFFFFFFFF; pdn = pci_get_pdn_by_devfn(bus, devfn); - if (!pdn) - return pnv_pci_cfg_read_raw(phb->opal_id, bus->number, devfn, - where, size, val); + if (!pdn) { + ret = pnv_pci_cfg_read_raw(phb->opal_id, bus->number, devfn, + where, size, val); + + if (!ret && (*val == EEH_IO_ERROR_VALUE(size)) && phb->unfreeze_pe) + phb->unfreeze_pe(phb, phb->ioda.reserved_pe_idx, + OPAL_EEH_ACTION_CLEAR_FREEZE_ALL); + + return ret; + } if (!pnv_pci_cfg_check(pdn)) return PCIBIOS_DEVICE_NOT_FOUND;