From patchwork Tue Jan 28 10:22:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar Kushwaha X-Patchwork-Id: 11353991 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 E063F92A for ; Tue, 28 Jan 2020 10:23:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B1A4D2467B for ; Tue, 28 Jan 2020 10:23:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=marvell.com header.i=@marvell.com header.b="Y3q+nV0c" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725941AbgA1KXC (ORCPT ); Tue, 28 Jan 2020 05:23:02 -0500 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:64634 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725901AbgA1KXB (ORCPT ); Tue, 28 Jan 2020 05:23:01 -0500 Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00SAKxs6024512; Tue, 28 Jan 2020 02:22:55 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=pfpt0818; bh=vBoizTfwbnl5JRXaRcVosErYn0VqUwy/ivayMnsCSXI=; b=Y3q+nV0cfgLrdYQK51YyHgbgdhbdR7Mx9Yv8JmkBEzEVn3kGsYpU7PHWRUWoyYETbc5H KHf3SeKSo3QjvgwNrl+j4rrz+gwjVOzrPIp5wdffvqW9ErwMlMWKxYo0C+uLoEJooFN/ sOVaueXpv/3DIQQznkcfTtjR1qv7B5+bRkAlq+Q6MASukNaioa7bTvI+oRdRus3bVpVs GC8/JTg2wjU693hnGdeUjUKg1YB9B2tArk/kw5bqIyJq/I3wR9px8oWYNT+fT8pQ4nNX iLXoibMVJKCfFI5BJl6fMmsWoMbrCi0qkoWNMCa5wgfFdYP6rjAaqzsbDIac65naB8w3 rQ== Received: from sc-exch03.marvell.com ([199.233.58.183]) by mx0b-0016f401.pphosted.com with ESMTP id 2xrp2t3hu9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Tue, 28 Jan 2020 02:22:55 -0800 Received: from SC-EXCH01.marvell.com (10.93.176.81) by SC-EXCH03.marvell.com (10.93.176.83) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 28 Jan 2020 02:22:53 -0800 Received: from maili.marvell.com (10.93.176.43) by SC-EXCH01.marvell.com (10.93.176.81) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 28 Jan 2020 02:22:53 -0800 Received: from dc5-eodlnx05.marvell.com (dc5-eodlnx05.marvell.com [10.69.113.147]) by maili.marvell.com (Postfix) with ESMTP id 227573F7041; Tue, 28 Jan 2020 02:22:53 -0800 (PST) From: Prabhakar Kushwaha To: , CC: , , , , , , , Prabhakar Kushwaha Subject: [RESEND][PATCH][v2] ata: ahci: Add shutdown to freeze hardware resources of ahci Date: Tue, 28 Jan 2020 02:22:51 -0800 Message-ID: <1580206971-29908-1-git-send-email-pkushwaha@marvell.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-28_03:2020-01-24,2020-01-28 signatures=0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org device_shutdown() called from reboot or power_shutdown expect all devices to be shutdown. Same is true for even ahci pci driver. As no ahci shutdown function is implemented, the ata subsystem always remains alive with DMA & interrupt support. File system related calls should not be honored after device_shutdown(). So defining ahci pci driver shutdown to freeze hardware (mask interrupt, stop DMA engine and free DMA resources). Signed-off-by: Prabhakar Kushwaha --- - Resending with linux-kernel@vger.kernel.org in CC - Changes for v2: Incorporated Bjorn Helgaas's comments - Updated description - Removed Spurious whitespace change Adding more details: We are seeing an issue during kexec -e where SATA hard-disk is not getting detected in second kernel. Lots of filesystem sync calls can be seen even after device_shutdown(). Further invastigation revealed that pci_clear_master() causing this issue. During device_shutdown() --> pci_device_shutdown() calls --> ahci shutdown (not defined as of now, so device is still alive) --> pci_clear_master() pci_clear_master() disable DMA of device. Here filesystem calls after device_shutdown() causing the issue. A device must implement shutdown() to stop/freeze before pcie_clear_master() called from pci_device_shutdown(). Otherwise It can have weird effect. Refer https://bugzilla.kernel.org/show_bug.cgi?id=63861#c24 drivers/ata/ahci.c | 7 +++++++ drivers/ata/libata-core.c | 21 +++++++++++++++++++++ include/linux/libata.h | 1 + 3 files changed, 29 insertions(+) diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 4bfd1b14b390..11ea1aff40db 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -81,6 +81,7 @@ enum board_ids { static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent); static void ahci_remove_one(struct pci_dev *dev); +static void ahci_shutdown_one(struct pci_dev *dev); static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class, unsigned long deadline); static int ahci_avn_hardreset(struct ata_link *link, unsigned int *class, @@ -606,6 +607,7 @@ static struct pci_driver ahci_pci_driver = { .id_table = ahci_pci_tbl, .probe = ahci_init_one, .remove = ahci_remove_one, + .shutdown = ahci_shutdown_one, .driver = { .pm = &ahci_pci_pm_ops, }, @@ -1877,6 +1879,11 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) return 0; } +static void ahci_shutdown_one(struct pci_dev *pdev) +{ + ata_pci_shutdown_one(pdev); +} + static void ahci_remove_one(struct pci_dev *pdev) { pm_runtime_get_noresume(&pdev->dev); diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 6f4ab5c5b52d..42c8728f6117 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -6767,6 +6767,26 @@ void ata_pci_remove_one(struct pci_dev *pdev) ata_host_detach(host); } +void ata_pci_shutdown_one(struct pci_dev *pdev) +{ + struct ata_host *host = pci_get_drvdata(pdev); + int i; + + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap = host->ports[i]; + + ap->pflags |= ATA_PFLAG_FROZEN; + + /* Disable port interrupts */ + if (ap->ops->freeze) + ap->ops->freeze(ap); + + /* Stop the port DMA engines */ + if (ap->ops->port_stop) + ap->ops->port_stop(ap); + } +} + /* move to PCI subsystem */ int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits) { @@ -7387,6 +7407,7 @@ EXPORT_SYMBOL_GPL(ata_timing_cycle2mode); #ifdef CONFIG_PCI EXPORT_SYMBOL_GPL(pci_test_config_bits); +EXPORT_SYMBOL_GPL(ata_pci_shutdown_one); EXPORT_SYMBOL_GPL(ata_pci_remove_one); #ifdef CONFIG_PM EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend); diff --git a/include/linux/libata.h b/include/linux/libata.h index 2dbde119721d..bff539918d82 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -1221,6 +1221,7 @@ struct pci_bits { }; extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits); +extern void ata_pci_shutdown_one(struct pci_dev *pdev); extern void ata_pci_remove_one(struct pci_dev *pdev); #ifdef CONFIG_PM