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