You can renew your HK passport at Chinese consulate in Toronto. The documents you are required are as follows:
1. Application form ID843 or ID844 and one application ID853.
2. copy of HK permanent residence ID or others that can prove your residency in HK.
3. three recent colored photos.
The fee charged by the consulate is about CAD65, you can either pay with cash or certified cheque. extra fee for post back to Canada, you need to pay with money order to HK SAR Government.