diff options
| author | Shane Xiao <shane.xiao@amd.com> | 2025-04-23 17:28:50 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2025-05-07 17:45:09 -0400 |
| commit | 2d274bf7099bc5e95fabaa93f23d0eb2977187ad (patch) | |
| tree | bfd761b70bfd736010b1523bba89f4bf65e64c3f /drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | |
| parent | 8e320f67d49d6bb28eba9c8bded66ad04b0acf0b (diff) | |
amd/amdkfd: Trigger segfault for early userptr unmmapping
If applications unmap the memory before destroying the userptr, it needs
trigger a segfault to notify user space to correct the free sequence in
VM debug mode.
v2: Send gpu access fault to user space
v3: Report gpu address to user space, remove unnecessary params
v4: update pr_err into one line, remove userptr log info
Signed-off-by: Shane Xiao <shane.xiao@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c index d2ec4130a316..260165bbe373 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c @@ -2559,6 +2559,18 @@ static int update_invalid_user_pages(struct amdkfd_process_info *process_info, if (ret != -EFAULT) return ret; + /* If applications unmap memory before destroying the userptr + * from the KFD, trigger a segmentation fault in VM debug mode. + */ + if (amdgpu_ttm_adev(bo->tbo.bdev)->debug_vm_userptr) { + pr_err("Pid %d unmapped memory before destroying userptr at GPU addr 0x%llx\n", + pid_nr(process_info->pid), mem->va); + + // Send GPU VM fault to user space + kfd_signal_vm_fault_event_with_userptr(kfd_lookup_process_by_pid(process_info->pid), + mem->va); + } + ret = 0; } |