linux-kernel - Linux Kernel build bug with AMD_IOMMU_V2=M and HSA

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Date:   Thu, 8 Apr 2021 19:04:56 -0400
From:   David Niklas <Hgntkwis@...mail.net>
To:     linux-kernel@...r.kernel.org
Cc:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        alexander.deucher@....com, christian.koenig@....com,
        Felix.Kuehling@....com, jroedel@...e.de, evan.quan@....com,
        baolu.lu@...ux.intel.com, fenghua.yu@...el.com, ray.huang@....com
Subject: Linux Kernel build bug with  AMD_IOMMU_V2=M and HSA_AMD=Y

Hello,
(There are so many maintainers for kfd_iommu.c I feel like I'm spamming.)

When compiling for Linux version 5.11.12 using the AMDGPU GPU driver
with HSA_AMD enabled, I get the below set of errors. To work around this,
I need to change AMD_IOMMU_V2 from M to Y. This bug doesn't affect linux
kernel version 5.6 as it requires AMD_IOMMU_V2 to by Y when HSA_AMD is
enabled.
I'd bisect and request the removal of the relevant patch, but it's
possible that building the linux kernel should work this way and so a fix,
not a patch removal, is what should be issued.
I'm attaching my kernel config for 5.11.

Thanks,
David

PS: I made an official bug report in case you'd prefer that:
https://bugzilla.kernel.org/show_bug.cgi?id=212619

drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: In function
`kfd_iommu_bind_process_to_device': /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:120:
undefined reference to `amd_iommu_bind_pasid'
drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: In function
`kfd_iommu_unbind_process': /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:138:
undefined reference to `amd_iommu_unbind_pasid'
drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: In function
`kfd_iommu_suspend': /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:292:
undefined reference to
`amd_iommu_set_invalidate_ctx_cb' /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:293:
undefined reference to `amd_iommu_set_invalid_ppr_cb'
drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: In function
`kfd_iommu_resume': /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:312:
undefined reference to
`amd_iommu_init_device' /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:316:
undefined reference to
`amd_iommu_set_invalidate_ctx_cb' /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:318:
undefined reference to
`amd_iommu_set_invalid_ppr_cb' /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:323:
undefined reference to
`amd_iommu_set_invalidate_ctx_cb' /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:324:
undefined reference to
`amd_iommu_set_invalid_ppr_cb' /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:325:
undefined reference to
`amd_iommu_free_device' /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:232:
undefined reference to `amd_iommu_bind_pasid'
drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: In function
`kfd_iommu_suspend': /root/working/linux-5.11.12/drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_iommu.c:294:
undefined reference to `amd_iommu_free_device' Makefile:1166: recipe for
target 'vmlinux' failed make: *** [vmlinux] Error 1

Download attachment "kernel-build-amdgpu-bug.conf.xz" of type "application/x-xz" (50448 bytes)