Excerpts from David Rientjes's message of June 7, 2020 8:57 pm:
Thanks for trying it out, Alex. Would you mind sending your .config and command line? I assume either mem_encrypt=on or CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT is enabled.
Could you also give this a try?
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -99,10 +99,11 @@ static inline bool dma_should_alloc_from_pool(struct device *dev, gfp_t gfp, static inline bool dma_should_free_from_pool(struct device *dev, unsigned long attrs) {
- if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL))
- if (!IS_ENABLED(CONFIG_DMA_COHERENT_POOL))
return false;- if (force_dma_unencrypted(dev)) return true;
- if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) &&
!force_dma_unencrypted(dev))
- if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) return false; if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP)) return true;
This patch doesn't work for me either. It has since occurred to me that while I do have CONFIG_AMD_MEM_ENCYRPT=y, I have CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=n, because it was broken with amdgpu (unfortunately a downgrade from radeon in this respect). Tried it again just now and it looks like it's now able to enable KMS, but all it displays is serious-looking errors.
Sorry for not mentioning that earlier. I'll send you my .config and command line off-list.
Thanks, Alex.