Re: [PATCH v2] PCI/IDE: Fix duplicate stream symlink names for TSM class devices

[Xu Yilun]

On Mon, Jan 05, 2026 at 10:13:17AM +0000, Jonathan Cameron wrote:
> On Mon,  5 Jan 2026 17:35:16 +0800
> Xu Yilun <yilun.xu@xxxxxxxxxxxxxxx> wrote:
> 
> > The name streamH.R.E is used for 2 symlinks:
> > 
> >   1. TSM class devices: /sys/class/tsm/tsmN/streamH.R.E
> >   2. host bridge devices: /sys/devices/pciDDDD:BB/streamH.R.E
> 
> For those who have managed to completely forget, it would be useful
> to just mention what H R and E are. Given the docs
> say H is the host bridge number I'm a little confused why it
> isn't unique. At least at first glance I'd expect to see

No, the Documentation/ABI/testing/sysfs-devices-pci-host-bridge says
H represents a Stream ID slot (or a Stream index) within the host
bridge's context, not the host bridge index itself. So do R/E.

> stream0.0.0 and stream 1.0.0 your example.
> Maybe H isn't unique across segments / PCI Domains? (DDDD in the above)
> Maybe it should be?

No. The counter of H along with the pciDDDD:BB/available_secure_streams,
indicate the platform hardware limitation on the maximum number of
Streams a host bridge can support. It should not be a global counter
across System.

Thanks,
Yilun