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USB4 specification defines the metadata needed to perform software
margining, as well as the necessary steps which include waiting for
dwell time.
- Add dwell_time attribute to set the wait time while performing
margining and checking for link errors.
- Add error_counter attribute to configure error counter prior to
margining test.
- Add voltage_time_offset attribute to set the voltage or time offset
steps before performing the software margining test.
- Perform software margining test for dwell duration, break if there are
link errors, stop the clocks and provide results.
Below is a minimalistic example how this can be used. Note these values
are just examples. The exact values in practice depend on host specific
capabilities and the type of measurement to be performed.
# cd /sys/kernel/debug/thunderbolt/ROUTER/portX/margining/
# echo software > mode
# echo 400 > dwell_time
# echo 1 > run
As usual the results attribute contains the results of a succesfull run.
Signed-off-by: R Kannappan <[email protected]>
Co-developed-by: Rene Sapiens <[email protected]>
Signed-off-by: Rene Sapiens <[email protected]>
Co-developed-by: Aapo Vienamo <[email protected]>
Signed-off-by: Aapo Vienamo <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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Add optional extended voltage offset range support for software and
hardware margining as defined by the USB4 specification.
If supported, it can be enabled like below:
# cd /sys/kernel/debug/thunderbolt/ROUTER/portX/margining/
# echo Y > optional_voltage_offset
Signed-off-by: Rene Sapiens <[email protected]>
Co-developed-by: R Kannappan <[email protected]>
Signed-off-by: R Kannappan <[email protected]>
Co-developed-by: Aapo Vienamo <[email protected]>
Signed-off-by: Aapo Vienamo <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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Consolidate the hardware and software margining parameters into a single
structure to reduce the number of parameters passed to the margining
functions.
Signed-off-by: Rene Sapiens <[email protected]>
Co-developed-by: Aapo Vienamo <[email protected]>
Signed-off-by: Aapo Vienamo <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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Synchronize the operation completion by reading back the software
margining operation completion metadata into margining->results.
Signed-off-by: Aapo Vienamo <[email protected]>
Co-developed-by: R Kannappan <[email protected]>
Signed-off-by: R Kannappan <[email protected]>
Co-developed-by: Rene Sapiens <[email protected]>
Signed-off-by: Rene Sapiens <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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Add missing free_page() call for the memory allocated by
validate_and_copy_from_user().
Fixes: 6d241fa00159 ("thunderbolt: Add sideband register access to debugfs")
Signed-off-by: Aapo Vienamo <[email protected]>
Reviewed-by: Przemek Kitszel <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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Use the FIELD_GET() macro instead of open coding the masks and shifts.
This makes the code more compact and improves readability as it avoids
the need to wrap excessively long lines.
Signed-off-by: Aapo Vienamo <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Yehezkel Bernat <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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Retimers support lane margining as well so make this available through
debugfs in the same way as we do for the USB4 ports. When this is
enabled we also expose retimers on the other side of the cable because
typically margining is implemented only on direction towards the cable.
However, for the retimers on the other side of the cable we do not allow
NVM upgrade to avoid confusing the existing userspace (the same retimer
may now appear twice with different name) and is probably not a good
idea anyway.
Signed-off-by: Mika Westerberg <[email protected]>
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In order to add lane margining support for retimers make the margining
functions take sideband target and retimer index as parameters. This
makes it possible to access both router and retimer sideband using the
same functions.
Signed-off-by: Mika Westerberg <[email protected]>
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We are going to expand lane margining support for retimers too so split
out the generic margining functionality out of being specific to USB4
ports.
Signed-off-by: Mika Westerberg <[email protected]>
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This makes it possible to read and write USB4 port and retimer sideband
registers through debugfs which is useful for debugging and manufacturing
purposes. We add "sb_regs" debugfs attribute under each USB4 port and
retimer that is used to access the sideband.
Signed-off-by: Mika Westerberg <[email protected]>
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The margin debugfs node controls the "Enable Margin Test" field of the
lane margining operations. This field selects between either low or high
voltage margin values for voltage margin test or left or right timing
margin values for timing margin test.
According to the USB4 specification, whether or not the "Enable Margin
Test" control applies, depends on the values of the "Independent
High/Low Voltage Margin" or "Independent Left/Right Timing Margin"
capability fields for voltage and timing margin tests respectively. The
pre-existing condition enabled the debugfs node also in the case where
both low/high or left/right margins are returned, which is incorrect.
This change only enables the debugfs node in question, if the specific
required capability values are met.
Signed-off-by: Aapo Vienamo <[email protected]>
Fixes: d0f1e0c2a699 ("thunderbolt: Add support for receiver lane margining")
Cc: [email protected]
Signed-off-by: Mika Westerberg <[email protected]>
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Intel pre-USB4 routers only have ROUTER_CS_0 up to ROUTER_CS_4 and it
immediately follows the TMU router registers. Correct this accordingly.
Reported-by: Rajaram Regupathy <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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The dentry returned by debugfs_lookup() needs to be released by calling
dput() which is missing in margining_port_remove(). Fix this by calling
debugfs_lookup_and_remove() that combines both and avoids the memory leak.
Fixes: d0f1e0c2a699 ("thunderbolt: Add support for receiver lane margining")
Cc: [email protected]
Signed-off-by: Yaxiong Tian <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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For USB4 v2 routers, the PCIe adapter capability length is longer.
Display the correct capability length in the debugfs register dump.
Signed-off-by: Gil Fine <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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For USB4 v2 routers, the DisplayPort IN adapter capability length is
longer. Display the correct capability length in the debugfs register
dump.
Signed-off-by: Gil Fine <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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routers
For USB4 v2 routers, the adapters's TMU capability has two additional
double words. Include them in the debugfs register dump.
Signed-off-by: Gil Fine <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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This allows us to disable all CL states temporarily when running lane
margining and then return back the previously enabled states.
Signed-off-by: Mika Westerberg <[email protected]>
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There really don't belong to switch.c so move them into their own file.
As we do this rename the functions to match the conventions used
elsewhere in the driver.
No functional changes.
Signed-off-by: Mika Westerberg <[email protected]>
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Memory for the usb4->margining needs to be relased for the upstream port
of the router as well, even though the debugfs directory gets released
with the router device removal. Fix this.
Fixes: d0f1e0c2a699 ("thunderbolt: Add support for receiver lane margining")
Cc: [email protected]
Signed-off-by: Mika Westerberg <[email protected]>
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When DisplayPort bandwidth allocation mode is supported by the DP IN
adapter it has an extra double word in the adapter config space. Include
this in the debugfs register dump.
Signed-off-by: Mika Westerberg <[email protected]>
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There are a handful of spelling mistakes in seq_puts text. Fix them.
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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USB4 spec defines standard set of registers to be used for receiver lane
margining. This is useful for I/O interface quality and electrical
robustness validation during manufacturing. Expose receiver lane
margining through new debugfs directory "margining" that is added under
each connected USB4 port. Users can then run the margining by writing to
the exposed attributes under that directory.
Signed-off-by: Mika Westerberg <[email protected]>
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Currently, when first failure occurs while reading of the block,
we stop reading the block and jump to the next capability.
This doesn't cover the case of block with "holes" of inaccessible
dwords, followed by accessible dwords.
This patch address this problem.
In case of failure while reading the complete block in one transaction,
(because of one or more dwords is inaccessible), we read the remaining
dwords of the block dword-by-dword, one dword per transaction,
till the end of the block.
By doing this, we handle the case of block with "holes" of inaccessible
dwords, followed by accessible dwords. The accessible dwords are shown
with the fields: <offset> <relative_offset> <cap_id> <vs_cap_id> <value>
E.g.:
0x01eb 236 0x05 0x06 0x0000d166
While the inaccesible dwords are shown as: <offset> <not accessible>
E.g.:
0x01ed <not accessible>
Signed-off-by: Gil Fine <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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There are cases when reading block of dwords in single transaction fail,
for several reasons, mostly if HW publish to implement all of the dwords,
while actually it doesn't or if some dwords not accessible for read
for security reasons. We handle these cases by trying to read the block,
dword-by-dword, one dword per transaction, till we get a failure.
Signed-off-by: Gil Fine <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-next
Mika writes:
thunderbolt: Changes for v5.11 merge window
This includes following Thunderbolt/USB4 changes for v5.11 merge window:
* DMA traffic test driver
* USB4 router NVM upgrade improvements
* USB4 router operations proxy implementation available in the recent
Intel Connection Manager firmwares
* Support for Intel Maple Ridge discrete Thunderbolt 4 controller
* A couple of cleanups and minor improvements.
* tag 'thunderbolt-for-v5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt: (22 commits)
thunderbolt: Add support for Intel Maple Ridge
thunderbolt: Add USB4 router operation proxy for firmware connection manager
thunderbolt: Move constants for USB4 router operations to tb_regs.h
thunderbolt: Add connection manager specific hooks for USB4 router operations
thunderbolt: Pass TX and RX data directly to usb4_switch_op()
thunderbolt: Pass metadata directly to usb4_switch_op()
thunderbolt: Perform USB4 router NVM upgrade in two phases
thunderbolt: Return -ENOTCONN when ERR_CONN is received
thunderbolt: Keep the parent runtime resumed for a while on device disconnect
thunderbolt: Log adapter numbers in decimal in path activation/deactivation
thunderbolt: Log which connection manager implementation is used
thunderbolt: Move max_boot_acl field to correct place in struct icm
MAINTAINERS: Add Isaac as maintainer of Thunderbolt DMA traffic test driver
thunderbolt: Add DMA traffic test driver
thunderbolt: Add support for end-to-end flow control
thunderbolt: Make it possible to allocate one directional DMA tunnel
thunderbolt: Create debugfs directory automatically for services
thunderbolt: Add functions for enabling and disabling lane bonding on XDomain
thunderbolt: Add link_speed and link_width to XDomain
thunderbolt: Create XDomain devices for loops back to the host
...
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This allows service drivers to use it as parent directory if they need
to add their own debugfs entries.
Signed-off-by: Mika Westerberg <[email protected]>
Acked-by: Yehezkel Bernat <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
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Some calls in the debugfs interface are made to the linux/uaccess.h header,
but the header is not referenced. So, for x86_64 architectures, this
dependency seems to be pulled in elsewhere, which leads to a successful
compilation. However, on arm/arm64 architectures, it was found to error out
on implicit declarations.
This change fixes the implicit declaration error by adding the
linux/uaccess.h header.
Fixes: 54e418106c76 ("thunderbolt: Add debugfs interface")
Signed-off-by: Casey Bowman <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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If the first line is in an invalid format then the "ret" value is
uninitialized. We should return -EINVAL instead.
Fixes: 54e418106c76 ("thunderbolt: Add debugfs interface")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
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This adds debugfs interface that can be used for debugging possible
issues in hardware/software. It exposes router and adapter config spaces
through files like this:
/sys/kernel/debug/thunderbolt/<DEVICE>/regs
/sys/kernel/debug/thunderbolt/<DEVICE>/<PORT1>/regs
/sys/kernel/debug/thunderbolt/<DEVICE>/<PORT1>/path
/sys/kernel/debug/thunderbolt/<DEVICE>/<PORT1>/counters
/sys/kernel/debug/thunderbolt/<DEVICE>/<PORT2>/regs
/sys/kernel/debug/thunderbolt/<DEVICE>/<PORT2>/path
/sys/kernel/debug/thunderbolt/<DEVICE>/<PORT2>/counters
...
The "regs" is either the router or port configuration space register
dump. The "path" is the port path configuration space and "counters" is
the optional counters configuration space.
These files contains one register per line so it should be easy to use
normal filtering tools to find the registers of interest if needed.
The router and adapter regs file becomes writable when
CONFIG_USB4_DEBUGFS_WRITE is enabled (which is not supposed to be done
in production systems) and in this case the developer can write "offset
value" lines there to modify the hardware directly. For convenience this
also supports the long format the read side produces (but ignores the
additional fields). The counters file can be written even when
CONFIG_USB4_DEBUGFS_WRITE is not enabled and it is only used to clear
the counter values.
Signed-off-by: Gil Fine <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
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