Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <6fff9d10-f77f-e55a-9020-8a1bd34cf508@amd.com>
Date:   Thu, 5 Jan 2023 15:57:28 +0530
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.8.1
Subject: =?UTF-8?Q?Re=3a_=5bregression=2c_bisected=2c_pci/iommu=5d_Bug=c2=a0?=
 =?UTF-8?Q?216865_-_Black_screen_when_amdgpu_started_during_6=2e2-rc1_boot_w?=
 =?UTF-8?Q?ith_AMD_IOMMU_enabled?=
Content-Language: en-US
To:     Matt Fagnani <matt.fagnani@bell.net>,
        Baolu Lu <baolu.lu@linux.intel.com>,
        Thorsten Leemhuis <regressions@leemhuis.info>
Cc:     Joerg Roedel <jroedel@suse.de>,
        "iommu@lists.linux.dev" <iommu@lists.linux.dev>,
        LKML <linux-kernel@vger.kernel.org>,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>,
        Linux PCI <linux-pci@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>
References: <15d0f9ff-2a56-b3e9-5b45-e6b23300ae3b@leemhuis.info>
 <5aa0e698-f715-0481-36e5-46505024ebc1@bell.net>
 <aea57c5f-2d20-c589-ad44-a63f1133a3db@linux.intel.com>
 <157c4ca4-370a-5d7e-fe32-c64d934f6979@amd.com>
 <223ee6d6-70ea-1d53-8bc2-2d22201d8dde@bell.net>
From:   Vasant Hegde <vasant.hegde@amd.com>
In-Reply-To: <223ee6d6-70ea-1d53-8bc2-2d22201d8dde@bell.net>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bzZtZE5ETENVd2hiOXg0N2NrNnZxaUMzQnNyQzgwdkFlZTFQZjNmZXlzd1dH?=
 =?utf-8?B?YUdBclVGZTRDdnJEdGhmZmczTDdJM1kwTWVJYzNmdi9CUHQrUEo5OURKdUcr?=
 =?utf-8?B?WFJnL29lVVNWbUJNVUhFWUNYN0dyblB6STkvR1lTUzQxRUlsSitFQmtVVG14?=
 =?utf-8?B?YUpaQmVDM2Yrc0pVUWY0NTU5aElqamJVQnZxb3NqQ21qR3hBcGsxTlIyUGNG?=
 =?utf-8?B?T21HemJyb0duNWFqTmJLSVhWVFFTVmcvRmVFK1NLenFPYmVRQmxrZGs4Q1ZU?=
 =?utf-8?B?OTI4TVJROGtPOGJjbmxKOHF3c2F0dzd1bXRMUFA2SURJNndoaUxZeUVZclpH?=
 =?utf-8?B?WGFIVWJVMDVobXhhYzlhMm9hSzkrKzdrNHJycjFkckFTMGVVM1N6RUZDK1Z6?=
 =?utf-8?B?NDJ2NkdwTzRWNTQ1emhmNkdmVERVMEJGOHdremJ3K3NmN2lkbERpNHRYL2kz?=
 =?utf-8?B?WXR1cm5XRDFnTkxFdEdZTWdiNlU0a1JSclhMTkROaTMvNE5DR3c2MWlidGc5?=
 =?utf-8?B?SlRmVEkzcTY2cU94WEc0SUJ0SjYxUjViL2RoTWlYcWJXbHRMa2xnSTdTU1Vn?=
 =?utf-8?B?Z1ZYQjBQdGZtRDl3OHQzVHVjZ0g4Vm90Y1VNdTVicUFKaitlbmxMWDlnSzAy?=
 =?utf-8?B?c3dFZWdLQ3R4R1FxWU9BU0YrYmtkOHBMcTJmR0dtK3dOUHJISUZsRFZKQW1a?=
 =?utf-8?B?L2lsQWZ0dHJ4QnBzMlV3TE1LWUhwOGR4c2hJOVQ5NStjcWlQU3grNHJDY0pp?=
 =?utf-8?B?MEgxeGg1Mk9ENkhHemcweG8xaHliTXo4djhoOWErazIrVTZId2xYUTEvVElF?=
 =?utf-8?B?a2ZFM2xaTk1QQ1YzQnYrWVpjd2g1VHVTeC9XcHZIQkY3WFFrYU1oa3RFL0pQ?=
 =?utf-8?B?Lytna0JJa1JDWmpwem1mbEFSY3ZBZHFqOC9UU1VhNktxbWVGaWQveU03eG51?=
 =?utf-8?B?UEdrRGRqcVoyWVhxdkZEclFXSzh2MnN0aStTTUVETHZia1JJYm1aY3NMOEFV?=
 =?utf-8?B?T3g4UzFNMm9rRmJ5N3ZTcVpiZ0tYanJ0NUNIREgrNnQrQ3V4Z0d5cW1jZ3lp?=
 =?utf-8?B?OUdXUTF0YTZQcjNZcXhFN0hkVTg3bjVLRlZXa2NhdksybWtYQXRNQU9DL29m?=
 =?utf-8?B?K200WTlTUzVYWnovaVNKZmJZcG9EK3IvRnNUbDlQdENsaHoxMGR4WHlPN3dh?=
 =?utf-8?B?S2d5V3dpa3RzdzczUEhzdkNtSDNpeFgvdld2NjNqNVU4ak1Bay90UjJWSkpT?=
 =?utf-8?B?c2owYlJ4Z2ZPZWlVVmQrT3loakpXUitrVHd0RlhraEdZa3lsS3UxZmtkbk14?=
 =?utf-8?B?RzIwck5tcmY4bXJFWGxQelFVN0ovNXQrazZvZ3NsMURlYW5QV3diaEdibWlK?=
 =?utf-8?B?QXlIdmVUSDRaT0JiN1d4Y2s1S1AvWnYwcVhvcFNuN2prWm9IVmY2QllhWGxL?=
 =?utf-8?B?Szc4OWk5dW5rdFBRVXFzeFJxN2liSzM3RTJpWlI0U0s0d1A5TXI2cXhxcEFr?=
 =?utf-8?B?M1pCaXMvai9rRGxDQUZrL0dvU0ZjUnllR1lsZS9UamFYdFRnM2tRL25pamFZ?=
 =?utf-8?B?ZmdVdmFTRXZVdEpKVVI2Sjc3SU4zT2tYR055aE1CK1VFUkxudktkMVJXQ3Vr?=
 =?utf-8?B?QXU2Zmtyay82Vmx3bjBuV2tNUkl5bzlQNHpjeGhsT0QxMnhCUFlDcDBxN2tE?=
 =?utf-8?B?WTByOHR2RTUyUFFqOVNFUzVjWU96RHVhbEVQZjhsd2xaRzR6OCtiaGFlR1dJ?=
 =?utf-8?B?VHU1YVpEa1Fxc0xjSTBVY295aWFKYm1uNUxBM3J1Uk0ySGxCTUp1dDBMdjNy?=
 =?utf-8?B?MFlXRXZnNFkydUJ4YlhMWDVLYlhnU1ZHREQ0TWY4b0pzMVpKM0lmKzlsc3VP?=
 =?utf-8?B?TVdUby8rWnZ1Wno0dWYvNWVWR0RLWFlOYVdseU1SdkhIOGpYenBSVDg4RW1s?=
 =?utf-8?B?cndKdXJVS3NGNTlWUU9IZlNHMnFLZHEyQmFXYVJyOWJndXMzck96bzZtU3dT?=
 =?utf-8?B?dFJnMzg0TnNBeUEyMStjWlY5U29ZeHJxRkNOd1NnS2pGbERtMjlEOVFXMTl1?=
 =?utf-8?B?UHhoUFJOelA2UXJZSmdBQXI1bTZOMk43WjhKQUhzQnFyZUhkdXYxSkRLQ3Rx?=
 =?utf-8?Q?DohgCYlPJedcwOk62bLUEQnej?=
X-OriginatorOrg: amd.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 250e5b58-0402-4538-d5f1-08daef077974
X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB6048.namprd12.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jan 2023 10:27:41.1449
 (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: 6q78C7QNTkn7N3qsWJwV8qPC1Fh2ahpakn6QTebZjeZ2q1MDhcSRYv/bCjzqCqaiXKlmynQ8sjzpuIdT6w2+pQ==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB8040
X-Spam-Status: No, score=-5.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Matt,

On 1/5/2023 6:39 AM, Matt Fagnani wrote:
> I built 6.2-rc2 with the patch applied. The same black screen problem happened
> with 6.2-rc2 with the patch. I tried to use early kdump with 6.2-rc2 with the
> patch twice by panicking the kernel with sysrq+alt+c after the black screen
> happened. The system rebooted after about 10-20 seconds both times, but no kdump
> and dmesg files were saved in /var/crash. I'm attaching the lspci -vvv output as
> requested.
> 

Thanks for testing. As mentioned earlier I was not expecting this patch to fix
the black screen issue. It should fix kernel warnings and IOMMU page fault
related call traces. By any chance do you have the kernel boot logs?


@Baolu,
  Looking into lspci output, it doesn't list ACS feature for Graphics card. So
with your fix it didn't enable PASID and hence it failed to boot.

-Vasant