Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

From: Jason Gunthorpe <jgg@nvidia.com>
To: Felix Kuehling <felix.kuehling@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>,
	"Baolu Lu" <baolu.lu@linux.intel.com>,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"Pan, Xinhui" <Xinhui.Pan@amd.com>,
	"Joerg Roedel" <jroedel@suse.de>,
	"regressions@lists.linux.dev" <regressions@lists.linux.dev>,
	"Thorsten Leemhuis" <regressions@leemhuis.info>,
	"Linux PCI" <linux-pci@vger.kernel.org>,
	"Vasant Hegde" <vasant.hegde@amd.com>,
	amd-gfx@lists.freedesktop.org,
	LKML <linux-kernel@vger.kernel.org>,
	"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
	"Matt Fagnani" <matt.fagnani@bell.net>,
	"Bjorn Helgaas" <bhelgaas@google.com>
Subject: Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled
Date: Tue, 10 Jan 2023 11:19:41 -0400	[thread overview]
Message-ID: <Y72CDYBjXi813/KY@nvidia.com> (raw)
In-Reply-To: <fa99d96e-6897-850a-8a46-98b03696e0bb@amd.com>

On Tue, Jan 10, 2023 at 10:05:44AM -0500, Felix Kuehling wrote:
> Am 2023-01-10 um 08:45 schrieb Christian König:
> > And I'm like 99% sure that Kabini/Wani should be identical to that.
> 
> Kabini is not supported by KFD. There should be no calls to amd_iommu_...
> functions on Kabini, at least not from kfd_iommu.c. And I'm not aware of any
> other callers in amdgpu.ko.

The backtrace from the system says otherwise..

>> [   13.515710]  amd_iommu_attach_device+0x2e0/0x300
>> [   13.515719]  __iommu_attach_device+0x1b/0x90
>> [   13.515727]  iommu_attach_group+0x65/0xa0
>> [   13.515735]  amd_iommu_init_device+0x16b/0x250 [iommu_v2]
>> [   13.515747]  kfd_iommu_resume+0x4c/0x1a0 [amdgpu]
>> [   13.517094]  kgd2kfd_resume_iommu+0x12/0x30 [amdgpu]
>> [   13.518419]  kgd2kfd_device_init.cold+0x346/0x49a [amdgpu]
>> [   13.519699]  amdgpu_amdkfd_device_init+0x142/0x1d0 [amdgpu]
>> [   13.520877]  amdgpu_device_init.cold+0x19f5/0x1e21 [amdgpu]
>> [   13.522118]  ? _raw_spin_lock_irqsave+0x23/0x50
>> [   13.522126]  amdgpu_driver_load_kms+0x15/0x110 [amdgpu]
>> [   13.523386]  amdgpu_pci_probe+0x161/0x370 [amdgpu]
>> [   13.524516]  local_pci_probe+0x41/0x80
>> [   13.524525]  pci_device_probe+0xb3/0x220
>> [   13.524533]  really_probe+0xde/0x380
>> [   13.524540]  ? pm_runtime_barrier+0x50/0x90
>> [   13.524546]  __driver_probe_device+0x78/0x170
>> [   13.524555]  driver_probe_device+0x1f/0x90
>> [   13.524560]  __driver_attach+0xce/0x1c0
>> [   13.524565]  ? __pfx___driver_attach+0x10/0x10
>> [   13.524570]  bus_for_each_dev+0x73/0xa0
>> [   13.524575]  bus_add_driver+0x1ae/0x200
>> [   13.524580]  driver_register+0x89/0xe0
>> [   13.524586]  ? __pfx_init_module+0x10/0x10 [amdgpu]
>> [   13.525819]  do_one_initcall+0x59/0x230
>> [   13.525828]  do_init_module+0x4a/0x200
>> [   13.525834]  __do_sys_init_module+0x157/0x180
>> [   13.525839]  do_syscall_64+0x5b/0x80
>> [   13.525845]  ? handle_mm_fault+0xff/0x2f0
>> [   13.525850]  ? do_user_addr_fault+0x1ef/0x690
>> [   13.525856]  ? exc_page_fault+0x70/0x170
>> [   13.525860]  entry_SYSCALL_64_after_hwframe+0x72/0xdc
>> [   13.525867] RIP: 0033:0x7fabd66cde4e

https://lore.kernel.org/all/157c4ca4-370a-5d7e-fe32-c64d934f6979@amd.com/

Jason