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Sat, 25 Jan 2020 03:37:30 +0000 Received: from CY4PR18MB1431.namprd18.prod.outlook.com ([fe80::2171:ec6b:bc83:f9e4]) by CY4PR18MB1431.namprd18.prod.outlook.com ([fe80::2171:ec6b:bc83:f9e4%9]) with mapi id 15.20.2665.017; Sat, 25 Jan 2020 03:37:29 +0000 Received: from dc5-eodlnx05.marvell.com (199.233.59.128) by BYAPR11CA0040.namprd11.prod.outlook.com (2603:10b6:a03:80::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2665.19 via Frontend Transport; Sat, 25 Jan 2020 03:37:29 +0000 From: Prabhakar Kushwaha To: "linux-ide@vger.kernel.org" , "axboe@kernel.dk" CC: "linux-pci@vger.kernel.org" , "helgaas@kernel.org" , "kexec@lists.infradead.org" , Ganapatrao Prabhakerrao Kulkarni , Kamlakant Patel , "prabhakar.pkin@gmail.com" , Prabhakar Kushwaha Subject: [PATCH][v2] ata: ahci: Add shutdown to freeze hardware resources of ahci Thread-Topic: [PATCH][v2] ata: ahci: Add shutdown to freeze hardware resources of ahci Thread-Index: AQHV0zDFIc+1qHkD6kyTCvBr6/M5VQ== Date: Sat, 25 Jan 2020 03:37:29 +0000 Message-ID: <1579923437-12983-1-git-send-email-pkushwaha@marvell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR11CA0040.namprd11.prod.outlook.com (2603:10b6:a03:80::17) To CY4PR18MB1431.namprd18.prod.outlook.com (2603:10b6:903:107::20) x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 1.8.3.1 x-originating-ip: [199.233.59.128] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7b341e5a-6ae5-4116-90d0-08d7a147e783 x-ms-traffictypediagnostic: CY4PR18MB1237: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6430; 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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 --- 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