The driver build should work without IOMMUv2. In amdkfd/Makefile, we have this condition: ifneq ($(CONFIG_AMD_IOMMU_V2),) AMDKFD_FILES += $(AMDKFD_PATH)/kfd_iommu.o endif In amdkfd/kfd_iommu.h we define inline stubs of the functions that are causing your link-failures if IOMMU_V2 is not enabled: #if defined(CONFIG_AMD_IOMMU_V2_MODULE) || defined(CONFIG_AMD_IOMMU_V2) ... function declarations ... #else ... stubs ... #endif Regards, Felix Am 2021-03-08 um 10:33 a.m. schrieb Arnd Bergmann: > From: Arnd Bergmann <arnd@xxxxxxxx> > > Using 'imply AMD_IOMMU_V2' does not guarantee that the driver can link > against the exported functions. If the GPU driver is built-in but the > IOMMU driver is a loadable module, the kfd_iommu.c file is indeed > built but does not work: > > x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_bind_process_to_device': > kfd_iommu.c:(.text+0x516): undefined reference to `amd_iommu_bind_pasid' > x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_unbind_process': > kfd_iommu.c:(.text+0x691): undefined reference to `amd_iommu_unbind_pasid' > x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_suspend': > kfd_iommu.c:(.text+0x966): undefined reference to `amd_iommu_set_invalidate_ctx_cb' > x86_64-linux-ld: kfd_iommu.c:(.text+0x97f): undefined reference to `amd_iommu_set_invalid_ppr_cb' > x86_64-linux-ld: kfd_iommu.c:(.text+0x9a4): undefined reference to `amd_iommu_free_device' > x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_resume': > kfd_iommu.c:(.text+0xa9a): undefined reference to `amd_iommu_init_device' > x86_64-linux-ld: kfd_iommu.c:(.text+0xadc): undefined reference to `amd_iommu_set_invalidate_ctx_cb' > x86_64-linux-ld: kfd_iommu.c:(.text+0xaff): undefined reference to `amd_iommu_set_invalid_ppr_cb' > x86_64-linux-ld: kfd_iommu.c:(.text+0xc72): undefined reference to `amd_iommu_bind_pasid' > x86_64-linux-ld: kfd_iommu.c:(.text+0xe08): undefined reference to `amd_iommu_set_invalidate_ctx_cb' > x86_64-linux-ld: kfd_iommu.c:(.text+0xe26): undefined reference to `amd_iommu_set_invalid_ppr_cb' > x86_64-linux-ld: kfd_iommu.c:(.text+0xe42): undefined reference to `amd_iommu_free_device' > > Use a stronger 'select' instead. > > Fixes: 64d1c3a43a6f ("drm/amdkfd: Centralize IOMMUv2 code and make it conditional") > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> > --- > drivers/gpu/drm/amd/amdkfd/Kconfig | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdkfd/Kconfig b/drivers/gpu/drm/amd/amdkfd/Kconfig > index f02c938f75da..91f85dfb7ba6 100644 > --- a/drivers/gpu/drm/amd/amdkfd/Kconfig > +++ b/drivers/gpu/drm/amd/amdkfd/Kconfig > @@ -5,8 +5,9 @@ > > config HSA_AMD > bool "HSA kernel driver for AMD GPU devices" > - depends on DRM_AMDGPU && (X86_64 || ARM64 || PPC64) > - imply AMD_IOMMU_V2 if X86_64 > + depends on DRM_AMDGPU && ((X86_64 && IOMMU_SUPPORT && ACPI) || ARM64 || PPC64) > + select AMD_IOMMU if X86_64 > + select AMD_IOMMU_V2 if X86_64 > select HMM_MIRROR > select MMU_NOTIFIER > select DRM_AMDGPU_USERPTR _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel