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Tue, 7 Dec 2021 10:36:18 +0000 From: To: CC: , , , , , , , , , Subject: RE: [PATCH] scsi: pm8001: Fix phys_to_virt() usage on dma_addr_t Thread-Topic: [PATCH] scsi: pm8001: Fix phys_to_virt() usage on dma_addr_t Thread-Index: AQHX4twBpu9E7jx9w0eTfQRflv+fTqwaU8QggArxp4CAAD4CgIABW1WQ Date: Tue, 7 Dec 2021 10:36:18 +0000 Message-ID: References: <1637940933-107862-1-git-send-email-john.garry@huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microchip.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7b47b77c-3f4d-4f00-db8f-08d9b96d677b x-ms-traffictypediagnostic: PH0PR11MB4853:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH0PR11MB5112.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(508600001)(52536014)(83380400001)(6916009)(7696005)(966005)(26005)(6506007)(53546011)(55016003)(4326008)(54906003)(38070700005)(316002)(8676002)(2906002)(8936002)(186003)(71200400001)(122000001)(38100700002)(86362001)(107886003)(64756008)(66446008)(66476007)(5660300002)(76116006)(66556008)(33656002)(66946007)(9686003)(10090945008);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PH0PR11MB5112.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7b47b77c-3f4d-4f00-db8f-08d9b96d677b X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Dec 2021 10:36:18.7394 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: XsqfvTzEMtjktidHCqON/uuiHQ+lNE5+H3TWCSgH++Km5MZWoJo+L/fdpAU6RB+F1RJ1YFk3pbEyzQnD3IXJNwKEAjOiTf/U+OQDEi/6E8M= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR11MB4853 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Hi John, Well I could see this kernel panic [ 126.843958] RIP: 0010:pm80xx_chip_smp= _req+0x1d6/0x2e0 [pm80xx] with respect to existing driver on my current sys= tem x86 64bit after enabling the following 2 kernel boot arguments: -intel_iommu=3Don -iommu.passthrough=3D0 Post application of this patch, now not observing the kernel panic and dev= ice discovery happens smoothly. Thanks, Ajish =20 -----Original Message----- From: Niklas Cassel =20 Sent: Monday, December 6, 2021 06:54 PM To: John Garry Cc: Ajish Koshy - I30923 ; jinpu.wang@cloud.iono= s.com; jejb@linux.ibm.com; martin.petersen@oracle.com; Viswas G - I30667 ; linux-scsi@vger.kernel.org; linux-kernel@vger.kerne= l.org; Damien Le Moal Subject: Re: [PATCH] scsi: pm8001: Fix phys_to_virt() usage on dma_addr_t [Some people who received this message don't often get email from niklas.ca= ssel@wdc.com. Learn why this is important at http://aka.ms/LearnAboutSender= Identification.] EXTERNAL EMAIL: Do not click links or open attachments unless you know the = content is safe On Mon, Dec 06, 2021 at 09:42:23AM +0000, John Garry wrote: > On 29/11/2021 10:46, Ajish.Koshy@microchip.com wrote: > > Thanks John for the update. Based on the given issue, > > we never tested on arm server. > > > > Further arm testing will depend on the availability of > > the server. > > > > Meanwhile will do further test on x86 and update > > on the observations. > > Have you tested on x86 with the IOMMU enabled? From my limited experience= , > out of the box the IOMMU is disabled in the BIOS on x86 machines - that i= s a > very general statement. But this is not just an issue specific to arm64. My limited experience tells me the opposite, that modern x64 servers have IOMMU enabled by default: E.g.: https://www.dell.com/support/manuals/en-uk/poweredge-r7515/r7515_bios_pub/p= rocessor-settings?guid=3Dguid-ec36d324-4f45-4bc1-bb51-de2db7cc5cd9&lang=3De= n-us https://support.hpe.com/hpesc/public/docDisplay?docId=3Da00025662en_us&docL= ocale=3Den_US This driver not working properly on a system with an IOMMU just tells us that the number of mainline users of this driver is very low :/ Kind regards, Niklas