Currently the string formatting is mixing up the offset of ret and
len. Re-work the code to use just len, remove ret and use scnprintf
instead of snprintf and len position accumulation where required.
Remove the -ve return check since scnprintf never returns a failure
-ve size. Also break overly long lines to clean up checkpatch
warnings.
Addresses-Coverity: ("Unused value")
Fixes: 1381a5113c ("usb: dwc3: debug: purge usage of strcat")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200210095139.328711-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The newline from the unknown link state tracepoint doesn't follow the
other tracepoints, and it looks unsightly. Let's remove it.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Patch moves some decoding functions from driver/usb/dwc3/debug.h driver
to driver/usb/common/debug.c file. These moved functions include:
dwc3_decode_get_status
dwc3_decode_set_clear_feature
dwc3_decode_set_address
dwc3_decode_get_set_descriptor
dwc3_decode_get_configuration
dwc3_decode_set_configuration
dwc3_decode_get_intf
dwc3_decode_set_intf
dwc3_decode_synch_frame
dwc3_decode_set_sel
dwc3_decode_set_isoch_delay
dwc3_decode_ctrl
These functions are used also in inroduced cdns3 driver.
All functions prefixes were changed from dwc3 to usb.
Also, function's parameters has been extended according to the name
of fields in standard SETUP packet.
Additionally, patch adds usb_decode_ctrl function to
include/linux/usb/ch9.h file.
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
DWC3 is missing the printing of control request GET_STATUS(device)
tracepoint. This patch prints that.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Instead of assuming that our buffer is big enough, let's pass the
buffer size around so printing functions can make sure they won't
overflow the buffer.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Highspeed device and below has different state names than superspeed and
higher. Add proper checks and printouts of link states for highspeed and
below.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
XferNotReady and XferInProgress give us the uFrame number we're
currently in. Printing that out on tracepoints may help us find bugs
in transfer scheduling.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This will make it easier to figure out the reason for the event. That
information really helps debugging certain problems.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Now that the SPDX tag is in all USB files, that identifies the license
in a specific and legally-defined manner. So the extra GPL text wording
can be removed as it is no longer needed at all.
This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text. And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.
No copyright headers or other non-license-description text was removed.
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.
Update the drivers/usb/ and include/linux/usb* files with the correct
SPDX license identifier based on the license text in the file itself.
The SPDX identifier is a legally binding shorthand, which can be used
instead of the full boiler plate text.
This work is based on a script and data from Thomas Gleixner, Philippe
Ombredanne, and Kate Stewart.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Instead, we can require caller to pass a buffer for the function to
use. This cleans things quite a bit.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Finally get rid of dwc3_trace() hack. If any other
message is truly needed, we should add proper
tracepoints for them instead of hacking around with
dwc3_trace() or similar.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
We don't need dwc3_trace() unless we're building a
kernel with CONFIG_FTRACE. This patch reduces
dwc3.ko text size a bit while also removing overhead
of dwc3_trace() calls.
text data bss dec hex filename
50796 581 0 51377 c8b1 drivers/usb/dwc3/dwc3.o
43961 581 0 44542 adfe drivers/usb/dwc3/dwc3.o.patched
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
With this extra piece of information, it will be
easier to find mismatches between driver and HW.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
We will be using dwc3_ep0_state_string() from within
our tracepoints, so we need to move that helper to
debug.h in order for it to be accessible.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
DWC3 can tell us which phase of a setup transfer
we're getting into. Let's decode it from the event
to make it easier to debug.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
There was a typo when generating endpoint name which
would be very confusing when debugging. Fix it.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Just like we did for endpoint commands, let's have a
single trace output for the command and its
status. This will improve trace readability
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Instead of printing command's status with a separate
trace printout, let's print it within a single call.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Debugfs init failure is not so important. We can continue our job on
this failure. Also no break need for debugfs_create_file call failure.
Signed-off-by: Du, Changbin <changbin.du@intel.com>
[felipe.balbi@linux.intel.com :
- remove out-of-memory message, we get that from OOM.
- switch dev_err() to dev_dbg() ]
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
When we're debugging hard-to-reproduce and time-sensitive
use cases, printk() poses too much overhead. That's when
the kernel's tracing infrastructure comes into play.
This patch implements a few initial tracepoints for the
dwc3 driver. More traces can be added as necessary in order
to ease the task of debugging dwc3.
Reviewed-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Those functions are only using within debugging
messages, grouping them into debug.h makes sense.
While at that, also add missing multiple inclusion
guard.
Signed-off-by: Felipe Balbi <balbi@ti.com>
This is a Linux-only driver which makes use
of GPL-only symbols. It makes no sense to
maintain Dual BSD/GPL licensing for this driver.
Considering that the amount of work to use this
driver in any different operating system would likely
be as large as developing the driver from scratch and
considering that we depend on GPL-only symbols, we
will switch over to a GPL v2-only license.
Cc: Anton Tikhomirov <av.tikhomirov@samsung.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Some people think that this line is not compatible with the GPL. The
statement was required due to the Buenos Aires Convention and is now
deprecated. I remove it because it is said that it is pointless nowdays.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
The DesignWare USB3 is a highly
configurable IP Core which can be
instantiated as Dual-Role Device (DRD),
Peripheral Only and Host Only (XHCI)
configurations.
Several other parameters can be configured
like amount of FIFO space, amount of TX and
RX endpoints, amount of Host Interrupters,
etc.
The current driver has been validated with
a virtual model of version 1.73a of that core
and with an FPGA burned with version 1.83a
of the DRD core. We have support for PCIe
bus, which is used on FPGA prototyping, and
for the OMAP5, more adaptation (or glue)
layers can be easily added and the driver
is half prepared to handle any possible
configuration the HW engineer has chosen
considering we have the information on
one of the GHWPARAMS registers to do
runtime checking of certain features.
More runtime checks can, and should, be added
in order to make this driver even more flexible
with regards to number of endpoints, FIFO sizes,
transfer types, etc.
While this supports only the device side, for
now, we will add support for Host side (xHCI -
see the updated series Sebastian has sent [1])
and OTG after we have it all stabilized.
[1] http://marc.info/?l=linux-usb&m=131341992020339&w=2
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Colin Ian King