Commit ea68573d authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/amdgpu: Fail to load on RAVEN if SME is active 



Due to hardware bugs, scatter/gather display on raven requires
a 1:1 IOMMU mapping, however, SME (System Memory Encryption)
requires an indirect IOMMU mapping because the encryption bit
is beyond the DMA mask of the chip.  As such, the two are
incompatible.

Acked-by: default avatarJoerg Roedel <jroedel@suse.de>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Acked-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 04a238e9

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

+10 −0
Original line number Diff line number Diff line
@@ -1101,6 +1101,16 @@ static int amdgpu_pci_probe(struct pci_dev *pdev, 
		return -ENODEV;

	}



	/* Due to hardware bugs, S/G Display on raven requires a 1:1 IOMMU mapping,

	 * however, SME requires an indirect IOMMU mapping because the encryption

	 * bit is beyond the DMA mask of the chip.

	 */

	if (mem_encrypt_active() && ((flags & AMD_ASIC_MASK) == CHIP_RAVEN)) {

		dev_info(&pdev->dev,

			 "SME is not compatible with RAVEN\n");

		return -ENOTSUPP;

	}



#ifdef CONFIG_DRM_AMDGPU_SI

	if (!amdgpu_si_support) {

		switch (flags & AMD_ASIC_MASK) {