drm/amdgpu: fix gpu page fault after hibernation on PF passthrough

On PF passthrough environment, after hibernate and then resume, coralgemm
will cause gpu page fault.

Mode1 reset happens during hibernate, but partition mode is not restored
on resume, register mmCP_HYP_XCP_CTL and mmCP_PSP_XCP_CTL is not right
after resume. When CP access the MQD BO, wrong stride size is used,
this will cause out of bound access on the MQD BO, resulting page fault.

The fix is to ensure gfx_v9_4_3_switch_compute_partition() is called
when resume from a hibernation.
KFD resume is called separately during a reset recovery or resume from
suspend sequence. Hence it's not required to be called as part of
partition switch.

Signed-off-by: Samuel Zhang <guoqing.zhang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/aqua_vanjaram.c b/drivers/gpu/drm/amd/amdgpu/aqua_vanjaram.c
index 811124f..f9e2edf 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/aqua_vanjaram.c
+++ b/drivers/gpu/drm/amd/amdgpu/aqua_vanjaram.c
@@ -407,7 +407,8 @@ static int aqua_vanjaram_switch_partition_mode(struct amdgpu_xcp_mgr *xcp_mgr,
                return -EINVAL;
        }
 
-       if (adev->kfd.init_complete && !amdgpu_in_reset(adev))
+       if (adev->kfd.init_complete && !amdgpu_in_reset(adev) &&
+               !adev->in_suspend)
                flags |= AMDGPU_XCP_OPS_KFD;
 
        if (flags & AMDGPU_XCP_OPS_KFD) {

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
index c4c551e..cbb74ff 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
@@ -2291,7 +2291,9 @@ static int gfx_v9_4_3_cp_resume(struct amdgpu_device *adev)
                r = amdgpu_xcp_init(adev->xcp_mgr, num_xcp, mode);
 
        } else {
-               if (amdgpu_xcp_query_partition_mode(adev->xcp_mgr,
+               if (adev->in_suspend)
+                       amdgpu_xcp_restore_partition_mode(adev->xcp_mgr);
+               else if (amdgpu_xcp_query_partition_mode(adev->xcp_mgr,
                                                    AMDGPU_XCP_FL_NONE) ==
                    AMDGPU_UNKNOWN_COMPUTE_PARTITION_MODE)
                        r = amdgpu_xcp_switch_partition_mode(