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Mon, 7 Sep 2020 11:10:22 +0000 Subject: Re: [PATCH 0/2] iommu/amd: Fix IOMMUv2 devices when SME is active To: Joerg Roedel , "Deucher, Alexander" Cc: "jroedel@suse.de" , "Kuehling, Felix" , "iommu@lists.linux-foundation.org" , "Huang, Ray" , "Lendacky, Thomas" , "Suthikulpanit, Suravee" , "linux-kernel@vger.kernel.org" References: <34db343f-cd23-09af-3bc5-29b9d385f85d@amd.com> <20200828134639.GW3354@suse.de> <60067932-dbf4-d67b-cf11-4dd2b016ed63@amd.com> <20200828152943.GY3354@suse.de> <20200904100556.GU6714@8bytes.org> <20200907104431.GH16609@8bytes.org> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <63c70551-255f-2df9-af70-7965e80172af@amd.com> Date: Mon, 7 Sep 2020 13:10:17 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200907104431.GH16609@8bytes.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-ClientProxiedBy: AM0PR02CA0024.eurprd02.prod.outlook.com (2603:10a6:208:3e::37) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:be8a:bd56:1f94:86e7] (2a02:908:1252:fb60:be8a:bd56:1f94:86e7) by AM0PR02CA0024.eurprd02.prod.outlook.com (2603:10a6:208:3e::37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3348.16 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9814f62f-f875-477c-4120-08d8531e9cfb X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB3775.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Sep 2020 11:10:22.3959 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 1jETjDDFtVjDjv2EcRoemDVU8HyeDGctz3+V1RztqtT6u+8rGU5H1IXD15R3EFTb X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4208 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 07.09.20 um 12:44 schrieb Joerg Roedel: > On Sun, Sep 06, 2020 at 04:08:58PM +0000, Deucher, Alexander wrote: >> From f479b9da353c2547c26ebac8930a5dcd9a134eb7 Mon Sep 17 00:00:00 2001 >> From: Alex Deucher >> Date: Sun, 6 Sep 2020 12:05:12 -0400 >> Subject: [PATCH] drm/amdgpu: Fail to load on RAVEN if SME is active >> >> Due to hardware bugs, scatter/gather display on raven requires >> a 1:1 IOMMU mapping, however, SME (System Memory Encryption) >> requires an indirect IOMMU mapping because the encryption bit >> is beyond the DMA mask of the chip. As such, the two are >> incompatible. >> >> Signed-off-by: Alex Deucher >> --- >> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 10 ++++++++++ >> 1 file changed, 10 insertions(+) >> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c >> index 12e16445df7c..d87d37c25329 100644 >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c >> @@ -1102,6 +1102,16 @@ static int amdgpu_pci_probe(struct pci_dev *pdev, >> return -ENODEV; >> } >> >> + /* Due to hardware bugs, S/G Display on raven requires a 1:1 IOMMU mapping, >> + * however, SME requires an indirect IOMMU mapping because the encryption >> + * bit is beyond the DMA mask of the chip. >> + */ >> + if (mem_encrypt_active() && ((flags & AMD_ASIC_MASK) == CHIP_RAVEN)) { >> + dev_info(&pdev->dev, >> + "SME is not compatible with RAVEN\n"); >> + return -ENOTSUPP; >> + } >> + >> #ifdef CONFIG_DRM_AMDGPU_SI >> if (!amdgpu_si_support) { >> switch (flags & AMD_ASIC_MASK) { >> -- >> 2.25.4 >> > Looks good to me, thanks. > > Acked-by: Joerg Roedel This is really unfortunate, but I don't see any other solution either. Reviewed-by: Christian König