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drm: fallback to dma_alloc_coherent when memory encryption is active

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We can't just map any randome page we get when memory encryption is
active.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.kernel.org/patch/10850833/
This commit is contained in:
Christian König 2019-03-13 10:11:19 +01:00
parent 088aed8bca
commit 64e1f830ea
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/drm_memory.c
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@ -168,6 +168,13 @@ bool drm_need_swiotlb(int dma_bits)
if (xen_pv_domain())
return true;
/*
* Enforce dma_alloc_coherent when memory encryption is active as well
* for the same reasons as for Xen paravirtual hosts.
*/
if (mem_encrypt_active())
return true;
for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
max_iomem = max(max_iomem, tmp->end);
}