Some external devices can support completing thunderbolt authentication
when they are unplugged. For this to work though, the link controller must
remain operational.
The only device known to support this right now is the Dell WD19TB, so add
a quirk for this.
Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This allows userspace to have a shorter period of time that the device
is unusable and to call it at a more convenient time.
For example flushing the image may happen while the user is using the
machine and authenticating/rebooting may happen while logging out.
Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
The 32 bit int value 512 is being left shifted and then used in a context
that expects the expression to be a larger unsigned long. There may be
a potential integer overflow, so make 512 a UL before shift to avoid
any such issues.
Addresses-Coverity: ("Uninintentional integer overflow")
Fixes: 3b1d8d577c ("thunderbolt: Implement USB3 bandwidth negotiation routines")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
USB4 spec specifies standard access to retimers (both on-board and
cable) through USB4 port sideband access. This makes it possible to
upgrade their firmware in the same way than we already do with the
routers.
This enumerates on-board retimers under each USB4 port when the link
comes up and adds them to the bus under the router the retimer belongs
to. Retimers are exposed in sysfs with name like <device>:<port>.<index>
where device is the router the retimer belongs to, port is the USB4 port
the retimer is connected to and index is the retimer index under that
port (starting from 1). This applies to the upstream USB4 port as well
so if there is on-board retimer between the port and the router it is
also added accordingly.
At this time we do not add cable retimers but there is no techincal
restriction to do so in the future if needed. It is not clear whether it
makes sense to upgrade their firmwares and at least Thunderbolt 3 cables
it has not been done outside of lab environments.
The sysfs interface is made to follow the router NVM upgrade to make it
easy to extend the existing userspace (fwupd) to handle these as well.
Signed-off-by: Kranthi Kuntala <kranthi.kuntala@intel.com>
Co-developed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
USB4 spec specifies standard set of sideband operations that are send
over the low speed link to access either retimers on the link or the
link parter (the other router). The USB4 retimer spec extends these and
adds operations for retimer NVM upgrade.
This implements the retimer access and NVM upgrade USB4 port sideband
operations which we need for retimer support in the patch that follows.
Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Co-developed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Especially when accessing retimers over USB4 sideband operations the
possibility to get read errors seems to be higher so make the
usb4_do_read_data() retry a couple of times if it sees any other error
than -ENODEV (device is gone). We can only do this for read side because
it carries the offset as part of metadata (as opposed to writes).
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Currently these functions operate on struct tb_switch but we are going
to need the same functionality with retimers as well so make the two
functions work with an arbitrary object that gets passed as parameter to
the callbacks.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
We are going to reuse some of this functionality to implement retimer
NVM upgrade so move common NVM functionality into its own file. We also
rename the structure from tb_switch_nvm to tb_nvm to make it clear that
it is not just for switches.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
With USB4 Intel is also using its USB-IF ID (0x8087) with the new
devices. The NVM format is the same. Add this to the driver so NVM
upgrade is possible with these devices as well.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
We can test some parts of tunneling, like path allocation without access
to test hardware so add KUnit tests for PCIe, DP and USB3 tunneling.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
USB3 supports both isochronous and non-isochronous traffic. The former
requires guaranteed bandwidth and can take up to 90% of the total
bandwidth. With USB4 USB3 is tunneled over USB4 fabric which means that
we need to make sure there is enough bandwidth allocated for the USB3
tunnels in addition to DisplayPort tunnels.
Whereas DisplayPort bandwidth management is static and done before the
DP tunnel is established, the USB3 bandwidth management is dynamic and
allows increasing and decreasing the allocated bandwidth according to
what is currently consumed. This is done through host router USB3
downstream adapter registers.
This adds USB3 bandwidth management to the software connection manager
so that we always try to allocate maximum bandwidth for DP tunnels and
what is left is allocated for USB3.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
We need to call this from tb.c when we improve the bandwidth management
to take USB3 into account.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Each host router USB3 downstream adapter has a set of registers that are
used to negotiate bandwidth between the connection manager and the
internal xHCI controller. These registers allow dynamic bandwidth
management for USB3 isochronous traffic based on what is actually
consumed vs. allocated at any given time.
Implement these USB3 bandwidth negotiation routines to allow the
software connection manager take advantage of these.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Sometimes it takes longer for DPRX to be set so increase the timeout to
cope with this.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Whereas DisplayPort bandwidth is consumed only in one direction (from DP
IN adapter to DP OUT adapter), USB3 adds separate bandwidth for both
upstream and downstream directions.
For this reason extend the tunnel consumed bandwidth routines to support
both directions and implement this for DP.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Just for symmetry with the usb4_switch_map_usb3_down() make this one
also return ports that are enabled.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
We need to call this on enabled ports in order to find the mapping from
host router USB4 port to a USB 3.x downstream adapter, so make the
function return enabled ports as well.
While there fix parameter alignment in tb_find_usb3_down().
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
USB3 tunneling is possible only over USB4 link so don't create USB3
tunnels if that's not the case.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
USB4 spec allows DP tunneling from any router that has DP IN adapter,
not just from host router. The driver currently only added the DP IN
resources for the host router because Thunderbolt 1, 2 and 3 devices do
not have DP IN adapters. However, USB4 allows device routers to have DP
IN adapter as well so update the driver to add DP IN resources for each
device that has one. One example would be an eGPU enclosure where the
eGPU output is forwarded to DP IN port and then tunneled over the USB4
fabric.
Only limitation we add now is that the DP IN and DP OUT that gets paired
for tunnel creation should both be under the same topology starting from
host router downstream port. In other words we do not create DP tunnels
across host router at this time even though that is possible as well but
it complicates the bandwidth management and there is no real use-case
for this anyway.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This adds KUnit tests for path walking which is only dependent on
software structures, so no hardware is needed to run these.
We make these available only when both KUnit and the driver itself are
built into the kernel image. The reason for this is that KUnit adds its
own module_init() call in kunit_test_suite() which generates linker
error because the driver does the same in nhi.c. This should be fine for
now because these tests are only meant to run by developers anyway.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Currently we have only supported paths that follow daisy-chain topology
but USB4 also allows to build trees of devices. For this reason increase
maximum path length we use for discovery to be from the lowest level to
the host router and back to the same level.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
If the path is not complete when we do discovery the number of hops may
be less than with the full path. As an example when this can happen is
that user unloads the driver, disconnects the topology, and loads the
driver back. If there is PCIe or USB3 tunnel involved this may happen.
Take this into account in tb_pcie_init_path() and tb_usb3_init_path()
and prevent potential access over array limits.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Add sanity check that given src and dst ports are reachable through path
walk before allocating a path. If they are not then bail out early.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
