amdgpu_ctx_get
ctx = amdgpu_ctx_get(filp->driver_priv, wait->in.ctx_id);
ctx = amdgpu_ctx_get(filp->driver_priv, user->ctx_id);
ctx = amdgpu_ctx_get(fpriv, deps[i].ctx_id);
p->ctx = amdgpu_ctx_get(fpriv, cs->in.ctx_id);
struct amdgpu_ctx *amdgpu_ctx_get(struct amdgpu_fpriv *fpriv, uint32_t id);
ctx = amdgpu_ctx_get(fpriv, ctx_id);