drm/amdgpu: define address map for host xgmi link (v3)

This applies to AMD Accelerated Processing Platforms that support host
gpu interconnect throguh a special link (xgmi). Aldebaran systems will
support this special feature for utilizing the benefits of host-gpu
cache coherence. This change outlines the basic framework for mapping
the GPU VRAM (HBM) to system address space making it accesible to the
host but managed by the amdgpu driver since this region is marked as
reserved memory in host address space by the underlying system firmware.

v2: switch to smuio callback function to check the type
of host-gpu interface (Hawking)
v3: use hub callbacks rather than direct function calls (Alex)

Reviewed-by: Oak Zeng <oak.zeng@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
index cdbea673a58e..96debb9713a4 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -917,11 +917,6 @@ int soc15_set_ip_blocks(struct amdgpu_device *adev)
 	if (!amdgpu_sriov_vf(adev))
 		soc15_reg_base_init(adev);
 
-	if (adev->asic_type == CHIP_VEGA20 ||
-	    adev->asic_type == CHIP_ARCTURUS ||
-	    adev->asic_type == CHIP_ALDEBARAN)
-		adev->gmc.xgmi.supported = true;
-
 	if (adev->flags & AMD_IS_APU) {
 		adev->nbio.funcs = &nbio_v7_0_funcs;
 		adev->nbio.hdp_flush_reg = &nbio_v7_0_hdp_flush_reg;