pcc_mbox_request_channel
data->pcc_chan = pcc_mbox_request_channel(&data->cl, ctx->subspace_id);
pcc_chan = pcc_mbox_request_channel(&cppc_mbox_cl, pcc_ss_idx);
pcc_chan = pcc_mbox_request_channel(&uncore->cl, uncore->chan_id);
pcc_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
pcc_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
EXPORT_SYMBOL_GPL(pcc_mbox_request_channel);
pcc_chan = pcc_mbox_request_channel(cl, hdev->chan_id);
pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);