On Tue, 2021-11-30 at 11:32 -0800, Bart Van Assche wrote: > On 11/30/21 12:54 AM, Bean Huo wrote: > > We are looking for alternative > > methods: for example, to fix this problem from the SCSI layer; > > Add a new dedicated hardware device management queue on the UFS > > device > > side. > > Hi Bean, > > I don't think that there are any alternatives. If all host controller > tags > are in use, it is not possible to implement a mechanism in software > to > create an additional tag. Additionally, stealing a tag is not > possible since > no new request can be submitted to a UFS controller if all tags are > in use. > > Thanks, > > Bart. Bart, How about adding a hardware-specific UFS device management queue to the UFS device? Compared with NVMe and eMMC CMDQ, they both have dedicated tags for device management commands. NVMe is queue 0, eMMC CMDQ is CMDQ slot 31. I'm thinking about the benefits of using this device manage queue. If the benefits are significant, we can submit the Jedec proposal for the UFS equipment management queue. Kind regards, Bean
