On Sun, Jul 28, 2024 at 05:41:09PM +0200, Lukas Wunner wrote: > On Wed, Jun 26, 2024 at 11:59:45AM +0300, Mika Westerberg wrote: > > On Wed, Jun 26, 2024 at 10:50:22AM +0200, Lukas Wunner wrote: > > > On Mon, Jun 24, 2024 at 11:58:46AM -0400, Esther Shimanovich wrote: > > > > On Wed, May 15, 2024 at 4:45???PM Lukas Wunner <lukas@xxxxxxxxx> wrote: > > > > > Could you add this to the command line: > > > > > thunderbolt.dyndbg ignore_loglevel log_buf_len=10M > > > > > > > > > > and this to your kernel config: > > > > > CONFIG_DYNAMIC_DEBUG=y > > > > > > > > > > You should see "... is associated with ..." messages in dmesg. > > > > > > > > I tried Lukas's patches again, after enabling the Thunderbolt driver > > > > in the config and also verbose messages, so that I can see > > > > "thunderbolt:" messages, but it still never reaches the > > > > tb_pci_notifier_call function. I don't see "associated with" in any of > > > > the logs. The config on the image I am testing does not have the > > > > thunderbolt driver enabled by default, so this patch wouldn't help my > > > > use case even if I did manage to get it to work. > > > > > > Mika, what do you make of this? Are the ChromeBooks in question > > > using ICM-based tunneling instead of native tunneling? I thought > > > this is all native nowadays and ICM is only used on older (pre-USB4) > > > products. > > > > I think these are not Chromebooks. They are "regular" PCs with > > Thunderbolt 3 host controller which is ICM as you suggest. > > > > There is still Maple Ridge and Tiger Lake (non-Chrome) that are ICM > > (firmware based connection manager) that are USB4 but everything after > > that is software based connection manager. > > Even with ICM, the DROM of the root switch seems to be retrieved: > > icm_start() > tb_switch_add() > tb_drom_read() > > Assuming the DROM contains proper PCIe Upstream and Downstream Adapter > Entries, all the data needed to at least associate the PCIe Adapters > on the root switch should be there. So I'm surprised Esther is not > seeing *any* messages. > > Do the DROMs on ICM root switches generally lack PCIe Upstream and > Downstream Adapter Entries? > What am I missing? My guess is that they are not populated for ICM host router DROM entries. These are pretty much Apple stuff and USB4 dropped them completely in favour of the router operations.
