platform/kernel/linux-rpi.git
4 years agotracing: Add kprobe event command generation test module
Tom Zanussi [Wed, 29 Jan 2020 18:59:31 +0000 (12:59 -0600)]
tracing: Add kprobe event command generation test module

Add a test module that checks the basic functionality of the in-kernel
kprobe event command generation API by creating kprobe events from a
module.

Link: http://lkml.kernel.org/r/97e502b204f9dba948e3fa3a4315448298218787.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Change trace_boot to use kprobe_event interface
Tom Zanussi [Wed, 29 Jan 2020 18:59:30 +0000 (12:59 -0600)]
tracing: Change trace_boot to use kprobe_event interface

Have trace_boot_add_kprobe_event() use the kprobe_event interface.

Also, rename kprobe_event_run_cmd() to kprobe_event_run_command() now
that trace_boot's version is gone.

Link: http://lkml.kernel.org/r/af5429d11291ab1e9a85a0ff944af3b2bcf193c7.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add kprobe event command generation functions
Tom Zanussi [Wed, 29 Jan 2020 18:59:29 +0000 (12:59 -0600)]
tracing: Add kprobe event command generation functions

Add functions used to generate kprobe event commands, built on top of
the dynevent_cmd interface.

kprobe_event_gen_cmd_start() is used to create a kprobe event command
using a variable arg list, and kretprobe_event_gen_cmd_start() does
the same for kretprobe event commands.  kprobe_event_add_fields() can
be used to add single fields one by one or as a group.  Once all
desired fields are added, kprobe_event_gen_cmd_end() or
kretprobe_event_gen_cmd_end() respectively are used to actually
execute the command and create the event.

Link: http://lkml.kernel.org/r/95cc4696502bb6017f9126f306a45ad19b4cc14f.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add synth event generation test module
Tom Zanussi [Wed, 29 Jan 2020 18:59:28 +0000 (12:59 -0600)]
tracing: Add synth event generation test module

Add a test module that checks the basic functionality of the in-kernel
synthetic event generation API by generating and tracing synthetic
events from a module.

Link: http://lkml.kernel.org/r/fcb4dd9eb9eefb70ab20538d3529d51642389664.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add synth_event_trace() and related functions
Tom Zanussi [Wed, 29 Jan 2020 18:59:27 +0000 (12:59 -0600)]
tracing: Add synth_event_trace() and related functions

Add an exported function named synth_event_trace(), allowing modules
or other kernel code to trace synthetic events.

Also added are several functions that allow the same functionality to
be broken out in a piecewise fashion, which are useful in situations
where tracing an event from a full array of values would be
cumbersome.  Those functions are synth_event_trace_start/end() and
synth_event_add_(next)_val().

Link: http://lkml.kernel.org/r/7a84de5f1854acf4144b57efe835ca645afa764f.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add synthetic event command generation functions
Tom Zanussi [Wed, 29 Jan 2020 18:59:25 +0000 (12:59 -0600)]
tracing: Add synthetic event command generation functions

Add functions used to generate synthetic event commands, built on top
of the dynevent_cmd interface.

synth_event_gen_cmd_start() is used to create a synthetic event
command using a variable arg list and
synth_event_gen_cmd_array_start() does the same thing but using an
array of field descriptors.  synth_event_add_field(),
synth_event_add_field_str() and synth_event_add_fields() can be used
to add single fields one by one or as a group.  Once all desired
fields are added, synth_event_gen_cmd_end() is used to actually
execute the command and create the event.

synth_event_create() does everything, including creating the event, in
a single call.

Link: http://lkml.kernel.org/r/38fef702fad5ef208009f459552f34a94befd860.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add dynamic event command creation interface
Tom Zanussi [Wed, 29 Jan 2020 18:59:24 +0000 (12:59 -0600)]
tracing: Add dynamic event command creation interface

Add an interface used to build up dynamic event creation commands,
such as synthetic and kprobe events.  Interfaces specific to those
particular types of events and others can be built on top of this
interface.

Command creation is started by first using the dynevent_cmd_init()
function to initialize the dynevent_cmd object.  Following that, args
are appended and optionally checked by the dynevent_arg_add() and
dynevent_arg_pair_add() functions, which use objects representing
arguments and pairs of arguments, initialized respectively by
dynevent_arg_init() and dynevent_arg_pair_init().  Finally, once all
args have been successfully added, the command is finalized and
actually created using dynevent_create().

The code here for actually printing into the dyn_event->cmd buffer
using snprintf() etc was adapted from v4 of Masami's 'tracing/boot:
Add synthetic event support' patch.

Link: http://lkml.kernel.org/r/1f65fa44390b6f238f6036777c3784ced1dcc6a0.1580323897.git.zanussi@kernel.org
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add synth_event_delete()
Tom Zanussi [Wed, 29 Jan 2020 18:59:23 +0000 (12:59 -0600)]
tracing: Add synth_event_delete()

create_or_delete_synth_event() contains code to delete a synthetic
event, which would be useful on its own - specifically, it would be
useful to allow event-creating modules to call it separately.

Separate out the delete code from that function and create an exported
function named synth_event_delete().

Link: http://lkml.kernel.org/r/050db3b06df7f0a4b8a2922da602d1d879c7c1c2.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add trace_get/put_event_file()
Tom Zanussi [Wed, 29 Jan 2020 18:59:22 +0000 (12:59 -0600)]
tracing: Add trace_get/put_event_file()

Add a function to get an event file and prevent it from going away on
module or instance removal.

trace_get_event_file() will find an event file in a given instance (if
instance is NULL, it assumes the top trace array) and return it,
pinning the instance's trace array as well as the event's module, if
applicable, so they won't go away while in use.

trace_put_event_file() does the matching release.

Link: http://lkml.kernel.org/r/bb31ac4bdda168d5ed3c4b5f5a4c8f633e8d9118.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
[ Moved trace_array_put() to end of trace_put_event_file() ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add trace_array_find/_get() to find instance trace arrays
Tom Zanussi [Wed, 29 Jan 2020 18:59:21 +0000 (12:59 -0600)]
tracing: Add trace_array_find/_get() to find instance trace arrays

Add a new trace_array_find() function that can be used to find a trace
array given the instance name, and replace existing code that does the
same thing with it.  Also add trace_array_find_get() which does the
same but returns the trace array after upping its refcount.

Also make both available for use outside of trace.c.

Link: http://lkml.kernel.org/r/cb68528c975eba95bee4561ac67dd1499423b2e5.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotrigger_next should increase position index
Vasily Averin [Fri, 24 Jan 2020 07:03:06 +0000 (10:03 +0300)]
trigger_next should increase position index

if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.

Without patch:
 # dd bs=30 skip=1 if=/sys/kernel/tracing/events/sched/sched_switch/trigger
 dd: /sys/kernel/tracing/events/sched/sched_switch/trigger: cannot skip to specified offset
 n traceoff snapshot stacktrace enable_event disable_event enable_hist disable_hist hist
 # Available triggers:
 # traceon traceoff snapshot stacktrace enable_event disable_event enable_hist disable_hist hist
 6+1 records in
 6+1 records out
 206 bytes copied, 0.00027916 s, 738 kB/s

Notice the printing of "# Available triggers:..." after the line.

With the patch:
 # dd bs=30 skip=1 if=/sys/kernel/tracing/events/sched/sched_switch/trigger
 dd: /sys/kernel/tracing/events/sched/sched_switch/trigger: cannot skip to specified offset
 n traceoff snapshot stacktrace enable_event disable_event enable_hist disable_hist hist
 2+1 records in
 2+1 records out
 88 bytes copied, 0.000526867 s, 167 kB/s

It only prints the end of the file, and does not restart.

Link: http://lkml.kernel.org/r/3c35ee24-dd3a-8119-9c19-552ed253388a@virtuozzo.com
https://bugzilla.kernel.org/show_bug.cgi?id=206283
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: eval_map_next() should always increase position index
Vasily Averin [Fri, 24 Jan 2020 07:03:01 +0000 (10:03 +0300)]
tracing: eval_map_next() should always increase position index

if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.

Link: http://lkml.kernel.org/r/7ad85b22-1866-977c-db17-88ac438bc764@virtuozzo.com
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
[ This is not a bug fix, it just makes it "technically correct"
  which is why I applied it. NULL is only returned on an anomaly
  which triggers a WARN_ON ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoftrace: fpid_next() should increase position index
Vasily Averin [Fri, 24 Jan 2020 07:02:56 +0000 (10:02 +0300)]
ftrace: fpid_next() should increase position index

if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.

Without patch:
 # dd bs=4 skip=1 if=/sys/kernel/tracing/set_ftrace_pid
 dd: /sys/kernel/tracing/set_ftrace_pid: cannot skip to specified offset
 id
 no pid
 2+1 records in
 2+1 records out
 10 bytes copied, 0.000213285 s, 46.9 kB/s

Notice the "id" followed by "no pid".

With the patch:
 # dd bs=4 skip=1 if=/sys/kernel/tracing/set_ftrace_pid
 dd: /sys/kernel/tracing/set_ftrace_pid: cannot skip to specified offset
 id
 0+1 records in
 0+1 records out
 3 bytes copied, 0.000202112 s, 14.8 kB/s

Notice that it only prints "id" and not the "no pid" afterward.

Link: http://lkml.kernel.org/r/4f87c6ad-f114-30bb-8506-c32274ce2992@virtuozzo.com
https://bugzilla.kernel.org/show_bug.cgi?id=206283
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Fix sched switch start/stop refcount racy updates
Mathieu Desnoyers [Sat, 17 Aug 2019 14:12:08 +0000 (10:12 -0400)]
tracing: Fix sched switch start/stop refcount racy updates

Reading the sched_cmdline_ref and sched_tgid_ref initial state within
tracing_start_sched_switch without holding the sched_register_mutex is
racy against concurrent updates, which can lead to tracepoint probes
being registered more than once (and thus trigger warnings within
tracepoint.c).

[ May be the fix for this bug ]
Link: https://lore.kernel.org/r/000000000000ab6f84056c786b93@google.com
Link: http://lkml.kernel.org/r/20190817141208.15226-1-mathieu.desnoyers@efficios.com
Cc: stable@vger.kernel.org
CC: Steven Rostedt (VMware) <rostedt@goodmis.org>
CC: Joel Fernandes (Google) <joel@joelfernandes.org>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Paul E. McKenney <paulmck@linux.ibm.com>
Reported-by: syzbot+774fddf07b7ab29a1e55@syzkaller.appspotmail.com
Fixes: d914ba37d7145 ("tracing: Add support for recording tgid of tasks")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Move external function declarations to kernel/trace/trace.h
Masami Hiramatsu [Wed, 29 Jan 2020 09:36:44 +0000 (18:36 +0900)]
tracing/boot: Move external function declarations to kernel/trace/trace.h

Move external function declarations into kernel/trace/trace.h
from trace_boot.c for tracing subsystem internal use.

Link: http://lkml.kernel.org/r/158029060405.12381.11944554430359702545.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Include required headers and sort it alphabetically
Masami Hiramatsu [Wed, 29 Jan 2020 09:36:35 +0000 (18:36 +0900)]
tracing/boot: Include required headers and sort it alphabetically

Include some required (but currently indirectly included)
headers and sort it alphabetically.

Link: http://lkml.kernel.org/r/158029059514.12381.6597832266860248781.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add new testcases for hist trigger parsing errors
Tom Zanussi [Fri, 28 Jun 2019 17:40:23 +0000 (12:40 -0500)]
tracing: Add new testcases for hist trigger parsing errors

Add a testcase ensuring that the tracing error_log correctly displays
hist trigger parsing errors.

Link: http://lkml.kernel.org/r/62ec58d9aca661cde46ba678e32a938427945e9e.1561743018.git.zanussi@kernel.org
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add 'hist:' to hist trigger error log error string
Tom Zanussi [Fri, 28 Jun 2019 17:40:22 +0000 (12:40 -0500)]
tracing: Add 'hist:' to hist trigger error log error string

The 'hist:' prefix gets stripped from the command text during command
processing, but should be added back when displaying the command
during error processing.

Not only because it's what should be displayed but also because not
having it means the test cases fail because the caret is miscalculated
by the length of the prefix string.

Link: http://lkml.kernel.org/r/449df721f560042e22382f67574bcc5b4d830d3d.1561743018.git.zanussi@kernel.org
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add hist trigger error messages for sort specification
Tom Zanussi [Fri, 28 Jun 2019 17:40:21 +0000 (12:40 -0500)]
tracing: Add hist trigger error messages for sort specification

Add error codes and messages for all the error paths leading to sort
specification parsing errors.

Link: http://lkml.kernel.org/r/237830dc05e583fbb53664d817a784297bf961be.1561743018.git.zanussi@kernel.org
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Simplify assignment parsing for hist triggers
Tom Zanussi [Fri, 28 Jun 2019 17:40:20 +0000 (12:40 -0500)]
tracing: Simplify assignment parsing for hist triggers

In the process of adding better error messages for sorting, I realized
that strsep was being used incorrectly and some of the error paths I
was expecting to be hit weren't and just fell through to the common
invalid key error case.

It also became obvious that for keyword assignments, it wasn't
necessary to save the full assignment and reparse it later, and having
a common empty-assignment check would also make more sense in terms of
error processing.

Change the code to fix these problems and simplify it for new error
message changes in a subsequent patch.

Link: http://lkml.kernel.org/r/1c3ef0b6655deaf345f6faee2584a0298ac2d743.1561743018.git.zanussi@kernel.org
Fixes: e62347d24534 ("tracing: Add hist trigger support for user-defined sorting ('sort=' param)")
Fixes: 7ef224d1d0e3 ("tracing: Add 'hist' event trigger command")
Fixes: a4072fe85ba3 ("tracing: Add a clock attribute for hist triggers")
Reported-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agodocs: tracing: Fix a broken label
Mauro Carvalho Chehab [Tue, 18 Jun 2019 18:51:17 +0000 (15:51 -0300)]
docs: tracing: Fix a broken label

Sphinx warnings about his:

Documentation/trace/kprobetrace.rst:68: WARNING: undefined label: user_mem_access (if the link has no caption the label must precede a section header)

The problem is quite simple: Sphinx wants a blank line after
references.

Link: http://lkml.kernel.org/r/a83ea390bc28784518fce772b4c961ea1c976f14.1560883872.git.mchehab+samsung@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Use pr_err() instead of WARN() for memory failures
Steven Rostedt (VMware) [Sat, 25 Jan 2020 15:52:30 +0000 (10:52 -0500)]
tracing: Use pr_err() instead of WARN() for memory failures

As warnings can trigger panics, especially when "panic_on_warn" is set,
memory failure warnings can cause panics and fail fuzz testers that are
stressing memory.

Create a MEM_FAIL() macro to use instead of WARN() in the tracing code
(perhaps this should be a kernel wide macro?), and use that for memory
failure issues. This should stop failing fuzz tests due to warnings.

Link: https://lore.kernel.org/r/CACT4Y+ZP-7np20GVRu3p+eZys9GPtbu+JpfV+HtsufAzvTgJrg@mail.gmail.com
Suggested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Decrement trace_array when bootconfig creates an instance
Steven Rostedt (VMware) [Sat, 25 Jan 2020 01:47:46 +0000 (20:47 -0500)]
tracing: Decrement trace_array when bootconfig creates an instance

The trace_array_get_by_name() creates a ftrace instance and
trace_array_put() is used to remove the reference. Even though the
trace_array_get_by_name() creates the instance, it also adds a reference
count to it, that prevents user space from removing it.

As the bootconfig just creates the instance on boot up, it should still be
used where it can be deleted by user space after boot. A trace_array_put()
is required to let that happen.

Also, change the documentation on trace_array_get_by_name() to make this not
be so confusing.

Link: https://lore.kernel.org/r/20200124205927.76128804@rorschach.local.home
Fixes: 4f712a4d04a4e ("tracing/boot: Add instance node support")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Fix comments about trace/ftrace.h
Hou Pengyang [Tue, 3 Mar 2015 21:48:18 +0000 (21:48 +0000)]
tracing: Fix comments about trace/ftrace.h

commit f42c85e74faa422cf0bc747ed808681145448f88 moved tracepoint's ftrace
creation into include/trace/ftrace.h and trace/define_trace.h was deleted
as a result. However some comment info does not adapt to the change, which
is such a misguiding when reading related code.

This patch fix this by moving trace/trace_events.h to <trace/events/XXX.h>,
since tracepoint headers have already been moved to tarce/events/.

Link: http://lkml.kernel.org/r/1425419298-61941-1-git-send-email-houpengyang@huawei.com
Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
[ Pulled from the archeological digging of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Remove unneeded NULL check
Dan Carpenter [Sat, 22 Nov 2014 18:30:12 +0000 (21:30 +0300)]
tracing: Remove unneeded NULL check

We checked "iter->trace" earlier so there is no need to check here.

Link: http://lkml.kernel.org/r/20141122183012.GB6994@mwanda
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
[ Pulled from the archeological digging of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Set kernel_stack's caller size properly
Josef Bacik [Wed, 24 Sep 2014 20:14:12 +0000 (16:14 -0400)]
tracing: Set kernel_stack's caller size properly

I noticed when trying to use the trace-cmd python interface that reading the raw
buffer wasn't working for kernel_stack events.  This is because it uses a
stubbed version of __dynamic_array that doesn't do the __data_loc trick and
encode the length of the array into the field.  Instead it just shows up as a
size of 0.  So change this to __array and set the len to FTRACE_STACK_ENTRIES
since this is what we actually do in practice and matches how user_stack_trace
works.

Link: http://lkml.kernel.org/r/1411589652-1318-1-git-send-email-jbacik@fb.com
Signed-off-by: Josef Bacik <jbacik@fb.com>
[ Pulled from the archeological digging of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Fix tracing_stat return values in error handling paths
Luis Henriques [Tue, 9 Sep 2014 21:49:41 +0000 (22:49 +0100)]
tracing: Fix tracing_stat return values in error handling paths

tracing_stat_init() was always returning '0', even on the error paths.  It
now returns -ENODEV if tracing_init_dentry() fails or -ENOMEM if it fails
to created the 'trace_stat' debugfs directory.

Link: http://lkml.kernel.org/r/1410299381-20108-1-git-send-email-luis.henriques@canonical.com
Fixes: ed6f1c996bfe4 ("tracing: Check return value of tracing_init_dentry()")
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
[ Pulled from the archeological digging of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Fix very unlikely race of registering two stat tracers
Steven Rostedt (VMware) [Fri, 24 Jan 2020 22:47:49 +0000 (17:47 -0500)]
tracing: Fix very unlikely race of registering two stat tracers

Looking through old emails in my INBOX, I came across a patch from Luis
Henriques that attempted to fix a race of two stat tracers registering the
same stat trace (extremely unlikely, as this is done in the kernel, and
probably doesn't even exist). The submitted patch wasn't quite right as it
needed to deal with clean up a bit better (if two stat tracers were the
same, it would have the same files).

But to make the code cleaner, all we needed to do is to keep the
all_stat_sessions_mutex held for most of the registering function.

Link: http://lkml.kernel.org/r/1410299375-20068-1-git-send-email-luis.henriques@canonical.com
Fixes: 002bb86d8d42f ("tracing/ftrace: separate events tracing and stats tracing engine")
Reported-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotrace/kprobe: Remove unused MAX_KPROBE_CMDLINE_SIZE
Alex Shi [Tue, 21 Jan 2020 05:54:35 +0000 (13:54 +0800)]
trace/kprobe: Remove unused MAX_KPROBE_CMDLINE_SIZE

This limitation are never lunched from introduce commit 970988e19eb0
("tracing/kprobe: Add kprobe_event= boot parameter")

Could we remove it if no intention to implement it?

Link: http://lkml.kernel.org/r/1579586075-45132-1-git-send-email-alex.shi@linux.alibaba.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Fix uninitialized buffer var on early exit to trace_vbprintk()
Steven Rostedt (VMware) [Wed, 22 Jan 2020 11:44:50 +0000 (06:44 -0500)]
tracing: Fix uninitialized buffer var on early exit to trace_vbprintk()

If we exit due to a bad input to trace_printk() (highly unlikely), then the
buffer variable will not be initialized when we unnest the ring buffer.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Fix an IS_ERR() vs NULL bug
Dan Carpenter [Fri, 17 Jan 2020 05:30:07 +0000 (08:30 +0300)]
tracing/boot: Fix an IS_ERR() vs NULL bug

The trace_array_get_by_name() function doesn't return error pointers,
it returns NULL on error.

Link: http://lkml.kernel.org/r/20200117053007.5h2juv272pokqhtq@kili.mountain
Fixes: 4f712a4d04a4 ("tracing/boot: Add instance node support")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Remove unused TRACE_SEQ_BUF_USED
Alex Shi [Tue, 21 Jan 2020 05:54:46 +0000 (13:54 +0800)]
tracing: Remove unused TRACE_SEQ_BUF_USED

This macro isn't used from commit 3a161d99c43c ("tracing: Create
seq_buf layer in trace_seq"). so no needs to keep it.

Link: http://lkml.kernel.org/r/1579586086-45543-1-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoring-buffer: Remove abandoned macro RB_MISSED_FLAGS
Alex Shi [Tue, 21 Jan 2020 05:54:40 +0000 (13:54 +0800)]
ring-buffer: Remove abandoned macro RB_MISSED_FLAGS

This macro isn't used since commit d325c402964e ("ring-buffer: Remove
unused function ring_buffer_page_len()"), so better to remove it.

Link: http://lkml.kernel.org/r/1579586080-45300-1-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotools: bootconfig: Fix spelling mistake "faile" -> "failed"
Colin Ian King [Thu, 16 Jan 2020 09:22:06 +0000 (09:22 +0000)]
tools: bootconfig: Fix spelling mistake "faile" -> "failed"

There are two spelling mistakes in printf statements, fix these.

Link: http://lkml.kernel.org/r/20200116092206.52192-1-colin.king@canonical.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoDocumentation: tracing: Fix typos in boot-time tracing documentation
Masami Hiramatsu [Mon, 20 Jan 2020 03:23:23 +0000 (12:23 +0900)]
Documentation: tracing: Fix typos in boot-time tracing documentation

Fix typos in boottime-trace.rst according to Randy's suggestions.

Link: http://lkml.kernel.org/r/157949060335.25888.13153184562531693684.stgit@devnote2
Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoDocumentation: bootconfig: Fix typos in bootconfig documentation
Masami Hiramatsu [Mon, 20 Jan 2020 03:23:12 +0000 (12:23 +0900)]
Documentation: bootconfig: Fix typos in bootconfig documentation

Fix typos in bootconfig.rst according to Randy's suggestions.

Link: http://lkml.kernel.org/r/157949059219.25888.16939971423610233631.stgit@devnote2
Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agobootconfig: Fix Kconfig help message for BOOT_CONFIG
Masami Hiramatsu [Mon, 20 Jan 2020 03:23:00 +0000 (12:23 +0900)]
bootconfig: Fix Kconfig help message for BOOT_CONFIG

Fix Kconfig help message since the bootconfig file is
only available to be appended to initramfs. And also
add a reference to the documentation.

Link: http://lkml.kernel.org/r/157949058031.25888.18399447161895787505.stgit@devnote2
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoftrace: Remove NR_TO_INIT macro
Alex Shi [Tue, 21 Jan 2020 05:54:23 +0000 (13:54 +0800)]
ftrace: Remove NR_TO_INIT macro

This macro isn't used from commit cb7be3b2fc2c ("ftrace: remove
daemon"). So no needs to keep it.

Link: http://lkml.kernel.org/r/1579586063-44984-1-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoftrace: Remove abandoned macros
Alex Shi [Tue, 21 Jan 2020 05:50:07 +0000 (13:50 +0800)]
ftrace: Remove abandoned macros

These 2 macros aren't used from commit eee8ded131f1 ("ftrace: Have the
function probes call their own function"), so remove them.

Link: http://lkml.kernel.org/r/1579585807-43316-1-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Allow trace_printk() to nest in other tracing code
Steven Rostedt (VMware) [Thu, 16 Jan 2020 13:20:18 +0000 (08:20 -0500)]
tracing: Allow trace_printk() to nest in other tracing code

trace_printk() is used to debug the kernel which includes the tracing
infrastructure. But because it writes to the ring buffer, and so does much
of the tracing infrastructure, the ring buffer's recursive detection will
drop writes to the ring buffer that is in the same context as the current
write is happening (it allows interrupts to write when normal context is
writing, but wont let normal context write while normal context is writing).

This can cause confusion and think that the code is where the trace_printk()
exists is not hit. To solve this, up the recursive nesting of the ring
buffer when trace_printk() is called before it writes to the buffer itself.

Note, this does make it dangerous to use trace_printk() in the ring buffer
code itself, because this basically disables the recursion protection of
trace_printk() buffer writes. But as trace_printk() is only used for
debugging, and if this does occur, the developer will see the cause real
quick (recursive blowing up of the stack). Thus the developer can deal with
that. But having trace_printk() silently ignored is a much bigger problem,
and disabling recursive protection is a small price to pay to fix it.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoring-buffer: Fix kernel doc for rb_update_event()
Steven Rostedt (VMware) [Tue, 14 Jan 2020 21:27:51 +0000 (16:27 -0500)]
ring-buffer: Fix kernel doc for rb_update_event()

rb_update_event has changed without the kernel-doc update.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoring-bufer: kernel-doc warning fixes
Fabian Frederick [Thu, 5 Jun 2014 18:22:05 +0000 (20:22 +0200)]
ring-bufer: kernel-doc warning fixes

Also fixes a couple of typos

Link: http://lkml.kernel.org/r/1401992525-10417-1-git-send-email-fabf@skynet.be
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
[ Found this deep in the abyss of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: trigger: Replace unneeded RCU-list traversals
Masami Hiramatsu [Fri, 20 Dec 2019 02:31:43 +0000 (11:31 +0900)]
tracing: trigger: Replace unneeded RCU-list traversals

With CONFIG_PROVE_RCU_LIST, I had many suspicious RCU warnings
when I ran ftracetest trigger testcases.

-----
  # dmesg -c > /dev/null
  # ./ftracetest test.d/trigger
  ...
  # dmesg | grep "RCU-list traversed" | cut -f 2 -d ] | cut -f 2 -d " "
  kernel/trace/trace_events_hist.c:6070
  kernel/trace/trace_events_hist.c:1760
  kernel/trace/trace_events_hist.c:5911
  kernel/trace/trace_events_trigger.c:504
  kernel/trace/trace_events_hist.c:1810
  kernel/trace/trace_events_hist.c:3158
  kernel/trace/trace_events_hist.c:3105
  kernel/trace/trace_events_hist.c:5518
  kernel/trace/trace_events_hist.c:5998
  kernel/trace/trace_events_hist.c:6019
  kernel/trace/trace_events_hist.c:6044
  kernel/trace/trace_events_trigger.c:1500
  kernel/trace/trace_events_trigger.c:1540
  kernel/trace/trace_events_trigger.c:539
  kernel/trace/trace_events_trigger.c:584
-----

I investigated those warnings and found that the RCU-list
traversals in event trigger and hist didn't need to use
RCU version because those were called only under event_mutex.

I also checked other RCU-list traversals related to event
trigger list, and found that most of them were called from
event_hist_trigger_func() or hist_unregister_trigger() or
register/unregister functions except for a few cases.

Replace these unneeded RCU-list traversals with normal list
traversal macro and lockdep_assert_held() to check the
event_mutex is held.

Link: http://lkml.kernel.org/r/157680910305.11685.15110237954275915782.stgit@devnote2
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoDocumentation: tracing: Add boot-time tracing document
Masami Hiramatsu [Fri, 10 Jan 2020 16:07:40 +0000 (01:07 +0900)]
Documentation: tracing: Add boot-time tracing document

Add a documentation about boot-time tracing options in
boot config.

Link: http://lkml.kernel.org/r/157867246028.17873.8047384554383977870.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Add function tracer filter options
Masami Hiramatsu [Fri, 10 Jan 2020 16:07:28 +0000 (01:07 +0900)]
tracing/boot: Add function tracer filter options

Add below function-tracer filter options to boot-time tracing.

 - ftrace.[instance.INSTANCE.]ftrace.filters
   This will take an array of tracing function filter rules

 - ftrace.[instance.INSTANCE.]ftrace.notraces
   This will take an array of NON-tracing function filter rules

Link: http://lkml.kernel.org/r/157867244841.17873.10933616628243103561.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Add cpu_mask option support
Masami Hiramatsu [Fri, 10 Jan 2020 16:07:16 +0000 (01:07 +0900)]
tracing/boot: Add cpu_mask option support

Add ftrace.cpumask option support to boot-time tracing.
This sets cpumask for each instance.

 - ftrace.[instance.INSTANCE.]cpumask = CPUMASK;
   Set the trace cpumask. Note that the CPUMASK should be a string
   which <tracefs>/tracing_cpumask can accepts.

Link: http://lkml.kernel.org/r/157867243625.17873.13613922641273149372.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Add instance node support
Masami Hiramatsu [Fri, 10 Jan 2020 16:07:04 +0000 (01:07 +0900)]
tracing/boot: Add instance node support

Add instance node support to boot-time tracing. User can set
some options and event nodes under instance node.

 - ftrace.instance.INSTANCE[...]
   Add new INSTANCE instance. Some options and event nodes
   are acceptable for instance node.

Link: http://lkml.kernel.org/r/157867242413.17873.9814204526141500278.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Add synthetic event support
Masami Hiramatsu [Fri, 10 Jan 2020 16:06:52 +0000 (01:06 +0900)]
tracing/boot: Add synthetic event support

Add synthetic event node support to boot time tracing.
The synthetic event is a kind of event node, but the group
name is "synthetic".

 - ftrace.event.synthetic.EVENT.fields = FIELD[, FIELD2...]
   Defines new synthetic event with FIELDs. Each field should be
   "type varname".

The synthetic node requires "fields" string arraies, which defines
the fields as same as tracing/synth_events interface.

Link: http://lkml.kernel.org/r/157867241236.17873.12411615143321557709.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot Add kprobe event support
Masami Hiramatsu [Fri, 10 Jan 2020 16:06:41 +0000 (01:06 +0900)]
tracing/boot Add kprobe event support

Add kprobe event support on event node to boot-time tracing.
If the group name of event is "kprobes", the boot-time tracing
defines new probe event according to "probes" values.

 - ftrace.event.kprobes.EVENT.probes = PROBE[, PROBE2...]
   Defines new kprobe event based on PROBEs. It is able to define
   multiple probes on one event, but those must have same type of
   arguments.

For example,

 ftrace.events.kprobes.myevent {
probes = "vfs_read $arg1 $arg2";
enable;
 }

This will add kprobes:myevent on vfs_read with the 1st and the 2nd
arguments.

Link: http://lkml.kernel.org/r/157867240104.17873.9712052065426433111.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Add per-event settings
Masami Hiramatsu [Fri, 10 Jan 2020 16:06:29 +0000 (01:06 +0900)]
tracing/boot: Add per-event settings

Add per-event settings for boottime tracing. User can set filter,
actions and enable on each event on boot. The event entries are
under ftrace.event.GROUP.EVENT node (note that the option key
includes event's group name and event name.) This supports below
configs.

 - ftrace.event.GROUP.EVENT.enable
   Enables GROUP:EVENT tracing.

 - ftrace.event.GROUP.EVENT.filter = FILTER
   Set FILTER rule to the GROUP:EVENT.

 - ftrace.event.GROUP.EVENT.actions = ACTION[, ACTION2...]
   Set ACTIONs to the GROUP:EVENT.

For example,

  ftrace.event.sched.sched_process_exec {
                filter = "pid < 128"
enable
  }

this will enable tracing "sched:sched_process_exec" event
with "pid < 128" filter.

Link: http://lkml.kernel.org/r/157867238942.17873.11177628789184546198.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/boot: Add boot-time tracing
Masami Hiramatsu [Fri, 10 Jan 2020 16:06:17 +0000 (01:06 +0900)]
tracing/boot: Add boot-time tracing

Setup tracing options via extra boot config in addition to kernel
command line.

This adds following commands support. These are applied to
the global trace instance.

 - ftrace.options = OPT1[,OPT2...]
   Enable given ftrace options.

 - ftrace.trace_clock = CLOCK
   Set given CLOCK to ftrace's trace_clock.

 - ftrace.buffer_size = SIZE
   Configure ftrace buffer size to SIZE. You can use "KB" or "MB"
   for that SIZE.

 - ftrace.events = EVENT[, EVENT2...]
   Enable given events on boot. You can use a wild card in EVENT.

 - ftrace.tracer = TRACER
   Set TRACER to current tracer on boot. (e.g. function)

Note that this is NOT replacing the kernel parameters, because
this boot config based setting is later than that. If you want to
trace earlier boot events, you still need kernel parameters.

Link: http://lkml.kernel.org/r/157867237723.17873.17494943526320587488.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Add NULL trace-array check in print_synth_event()
Masami Hiramatsu [Fri, 10 Jan 2020 16:06:05 +0000 (01:06 +0900)]
tracing: Add NULL trace-array check in print_synth_event()

Add NULL trace-array check in print_synth_event(), because
if we enable tp_printk option, iter->tr can be NULL.

Link: http://lkml.kernel.org/r/157867236536.17873.12529350542460184019.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Accept different type for synthetic event fields
Masami Hiramatsu [Fri, 10 Jan 2020 16:05:53 +0000 (01:05 +0900)]
tracing: Accept different type for synthetic event fields

Make the synthetic event accepts a different type field to record.
However, the size and signed flag must be same.

Link: http://lkml.kernel.org/r/157867235358.17873.61732996461602171.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: kprobes: Register to dynevent earlier stage
Masami Hiramatsu [Fri, 10 Jan 2020 16:05:42 +0000 (01:05 +0900)]
tracing: kprobes: Register to dynevent earlier stage

Register kprobe event to dynevent in subsys_initcall level.
This will allow kernel to register new kprobe events in
fs_initcall level via trace_run_command.

Link: http://lkml.kernel.org/r/157867234213.17873.18039000024374948737.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: kprobes: Output kprobe event to printk buffer
Masami Hiramatsu [Fri, 10 Jan 2020 16:05:31 +0000 (01:05 +0900)]
tracing: kprobes: Output kprobe event to printk buffer

Since kprobe-events use event_trigger_unlock_commit_regs() directly,
that events doesn't show up in printk buffer if "tp_printk" is set.

Use trace_event_buffer_commit() in kprobe events so that it can
invoke output_printk() as same as other trace events.

Link: http://lkml.kernel.org/r/157867233085.17873.5210928676787339604.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
[ Adjusted data var declaration placement in __kretprobe_trace_func() ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Apply soft-disabled and filter to tracepoints printk
Masami Hiramatsu [Fri, 10 Jan 2020 16:05:18 +0000 (01:05 +0900)]
tracing: Apply soft-disabled and filter to tracepoints printk

Apply soft-disabled and the filter rule of the trace events to
the printk output of tracepoints (a.k.a. tp_printk kernel parameter)
as same as trace buffer output.

Link: http://lkml.kernel.org/r/157867231876.17873.15825819592284704068.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoDocumentation: bootconfig: Add a doc for extended boot config
Masami Hiramatsu [Fri, 10 Jan 2020 16:05:06 +0000 (01:05 +0900)]
Documentation: bootconfig: Add a doc for extended boot config

Add a documentation for extended boot config under
admin-guide, since it is including the syntax of boot config.

Link: http://lkml.kernel.org/r/157867230658.17873.9309879174829924324.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agobootconfig: init: Allow admin to use bootconfig for init command line
Masami Hiramatsu [Fri, 10 Jan 2020 16:04:55 +0000 (01:04 +0900)]
bootconfig: init: Allow admin to use bootconfig for init command line

Since the current kernel command line is too short to describe
long and many options for init (e.g. systemd command line options),
this allows admin to use boot config for init command line.

All init command line under "init." keywords will be passed to
init.

For example,

init.systemd {
unified_cgroup_hierarchy = 1
debug_shell
default_timeout_start_sec = 60
}

Link: http://lkml.kernel.org/r/157867229521.17873.654222294326542349.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agobootconfig: init: Allow admin to use bootconfig for kernel command line
Masami Hiramatsu [Fri, 10 Jan 2020 16:04:43 +0000 (01:04 +0900)]
bootconfig: init: Allow admin to use bootconfig for kernel command line

Since the current kernel command line is too short to describe
many options which supported by kernel, allow user to use boot
config to setup (add) the command line options.

All kernel parameters under "kernel." keywords will be used
for setting up extra kernel command line.

For example,

kernel {
audit = on
audit_backlog_limit = 256
}

Note that you can not specify some early parameters
(like console etc.) by this method, since it is
loaded after early parameters parsed.

Link: http://lkml.kernel.org/r/157867228333.17873.11962796367032622466.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoinit/main.c: Alloc initcall_command_line in do_initcall() and free it
Masami Hiramatsu [Fri, 10 Jan 2020 16:04:31 +0000 (01:04 +0900)]
init/main.c: Alloc initcall_command_line in do_initcall() and free it

Since initcall_command_line is used as a temporary buffer,
it could be freed after usage. Allocate it in do_initcall()
and free it after used.

Link: http://lkml.kernel.org/r/157867227145.17873.17513760552008505454.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoproc: bootconfig: Add /proc/bootconfig to show boot config list
Masami Hiramatsu [Fri, 10 Jan 2020 16:04:19 +0000 (01:04 +0900)]
proc: bootconfig: Add /proc/bootconfig to show boot config list

Add /proc/bootconfig which shows the list of key-value pairs
in boot config. Since after boot, all boot configs and tree
are removed, this interface just keep a copy of key-value
pairs in text.

Link: http://lkml.kernel.org/r/157867225967.17873.12155805787236073787.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotools: bootconfig: Add bootconfig test script
Masami Hiramatsu [Fri, 10 Jan 2020 16:04:07 +0000 (01:04 +0900)]
tools: bootconfig: Add bootconfig test script

Add a bootconfig test script to ensure the tool and
boot config parser are working correctly.

Link: http://lkml.kernel.org/r/157867224728.17873.18114241801246589416.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotools: bootconfig: Add bootconfig command
Masami Hiramatsu [Fri, 10 Jan 2020 16:03:56 +0000 (01:03 +0900)]
tools: bootconfig: Add bootconfig command

Add "bootconfig" command which operates the bootconfig
config-data on initrd image.

User can add/delete/verify the boot config on initrd
image using this command.

e.g.
Add a boot config to initrd image
 # bootconfig -a myboot.conf /boot/initrd.img

Remove it.
 # bootconfig -d /boot/initrd.img

Or verify (and show) it.
 # bootconfig /boot/initrd.img

Link: http://lkml.kernel.org/r/157867223582.17873.14342161849213219982.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
[ Removed extra blank line at end of bootconfig.c ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agobootconfig: Load boot config from the tail of initrd
Masami Hiramatsu [Fri, 10 Jan 2020 16:03:44 +0000 (01:03 +0900)]
bootconfig: Load boot config from the tail of initrd

Load the extended boot config data from the tail of initrd
image. If there is an SKC data there, it has
[(u32)size][(u32)checksum] header (in really, this is a
footer) at the end of initrd. If the checksum (simple sum
of bytes) is match, this starts parsing it from there.

Link: http://lkml.kernel.org/r/157867222435.17873.9936667353335606867.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agobootconfig: Add Extra Boot Config support
Masami Hiramatsu [Fri, 10 Jan 2020 16:03:32 +0000 (01:03 +0900)]
bootconfig: Add Extra Boot Config support

Extra Boot Config (XBC) allows admin to pass a tree-structured
boot configuration file when boot up the kernel. This extends
the kernel command line in an efficient way.

Boot config will contain some key-value commands, e.g.

key.word = value1
another.key.word = value2

It can fold same keys with braces, also you can write array
data. For example,

key {
   word1 {
      setting1 = data
      setting2
   }
   word2.array = "val1", "val2"
}

User can access these key-value pair and tree structure via
SKC APIs.

Link: http://lkml.kernel.org/r/157867221257.17873.1775090991929862549.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Make struct ring_buffer less ambiguous
Steven Rostedt (VMware) [Fri, 13 Dec 2019 18:58:57 +0000 (13:58 -0500)]
tracing: Make struct ring_buffer less ambiguous

As there's two struct ring_buffers in the kernel, it causes some confusion.
The other one being the perf ring buffer. It was agreed upon that as neither
of the ring buffers are generic enough to be used globally, they should be
renamed as:

   perf's ring_buffer -> perf_buffer
   ftrace's ring_buffer -> trace_buffer

This implements the changes to the ring buffer that ftrace uses.

Link: https://lore.kernel.org/r/20191213140531.116b3200@gandalf.local.home
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Rename trace_buffer to array_buffer
Steven Rostedt (VMware) [Thu, 9 Jan 2020 23:53:48 +0000 (18:53 -0500)]
tracing: Rename trace_buffer to array_buffer

As we are working to remove the generic "ring_buffer" name that is used by
both tracing and perf, the ring_buffer name for tracing will be renamed to
trace_buffer, and perf's ring buffer will be renamed to perf_buffer.

As there already exists a trace_buffer that is used by the trace_arrays, it
needs to be first renamed to array_buffer.

Link: https://lore.kernel.org/r/20191213153553.GE20583@krava
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoperf: Make struct ring_buffer less ambiguous
Steven Rostedt (VMware) [Fri, 13 Dec 2019 18:21:30 +0000 (13:21 -0500)]
perf: Make struct ring_buffer less ambiguous

eBPF requires needing to know the size of the perf ring buffer structure.
But it unfortunately has the same name as the generic ring buffer used by
tracing and oprofile. To make it less ambiguous, rename the perf ring buffer
structure to "perf_buffer".

As other parts of the ring buffer code has "perf_" as the prefix, it only
makes sense to give the ring buffer the "perf_" prefix as well.

Link: https://lore.kernel.org/r/20191213153553.GE20583@krava
Acked-by: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoLinux 5.5-rc6
Linus Torvalds [Mon, 13 Jan 2020 00:55:08 +0000 (16:55 -0800)]
Linux 5.5-rc6

4 years agoMerge tag 'riscv/for-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv...
Linus Torvalds [Mon, 13 Jan 2020 00:48:39 +0000 (16:48 -0800)]
Merge tag 'riscv/for-v5.5-rc6' of git://git./linux/kernel/git/riscv/linux

Pull RISC-V fixes from Paul Walmsley:
 "Two fixes for RISC-V:

   - Clear FP registers during boot when FP support is present, rather
     than when they aren't present

   - Move the header files associated with the SiFive L2 cache
     controller to drivers/soc (where the code was recently moved)"

* tag 'riscv/for-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: Fixup obvious bug for fp-regs reset
  riscv: move sifive_l2_cache.h to include/soc

4 years agoriscv: Fixup obvious bug for fp-regs reset
Guo Ren [Sun, 5 Jan 2020 02:52:14 +0000 (10:52 +0800)]
riscv: Fixup obvious bug for fp-regs reset

CSR_MISA is defined in Privileged Architectures' spec: 3.1.1 Machine
ISA Register misa. Every bit:1 indicate a feature, so we should beqz
reset_done when there is no F/D bit in csr_misa register.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
[paul.walmsley@sifive.com: fix typo in commit message]
Fixes: 9e80635619b51 ("riscv: clear the instruction cache and all registers when booting")
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
4 years agoriscv: move sifive_l2_cache.h to include/soc
Yash Shah [Wed, 8 Jan 2020 06:09:06 +0000 (22:09 -0800)]
riscv: move sifive_l2_cache.h to include/soc

The commit 9209fb51896f ("riscv: move sifive_l2_cache.c to drivers/soc")
moves the sifive L2 cache driver to driver/soc. It did not move the
header file along with the driver. Therefore this patch moves the header
file to driver/soc

Signed-off-by: Yash Shah <yash.shah@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
[paul.walmsley@sifive.com: updated to fix the include guard]
Fixes: 9209fb51896f ("riscv: move sifive_l2_cache.c to drivers/soc")
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
4 years agoMerge tag 'iommu-fixes-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 12 Jan 2020 17:35:42 +0000 (09:35 -0800)]
Merge tag 'iommu-fixes-v5.5-rc5' of git://git./linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - Two fixes for VT-d and generic IOMMU code to fix teardown on error
   handling code paths.

 - Patch for the Intel VT-d driver to fix handling of non-PCI devices

 - Fix W=1 compile warning in dma-iommu code

* tag 'iommu-fixes-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/dma: fix variable 'cookie' set but not used
  iommu/vt-d: Unlink device if failed to add to group
  iommu: Remove device link to group on failure
  iommu/vt-d: Fix adding non-PCI devices to Intel IOMMU

4 years agoMerge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
Linus Torvalds [Sat, 11 Jan 2020 23:40:43 +0000 (15:40 -0800)]
Merge branch 'i2c/for-current' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Two driver bugfixes, a documentation fix, and a removal of a spec
  violation for the bus recovery algorithm in the core"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: fix bus recovery stop mode timing
  i2c: bcm2835: Store pointer to bus clock
  dt-bindings: i2c: at91: fix i2c-sda-hold-time-ns documentation for sam9x60
  i2c: at91: fix clk_offset for sam9x60

4 years agoMerge tag 'clone3-tls-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 11 Jan 2020 23:33:48 +0000 (15:33 -0800)]
Merge tag 'clone3-tls-v5.5-rc6' of git://git./linux/kernel/git/brauner/linux

Pull thread fixes from Christian Brauner:
 "This contains a series of patches to fix CLONE_SETTLS when used with
  clone3().

  The clone3() syscall passes the tls argument through struct clone_args
  instead of a register. This means, all architectures that do not
  implement copy_thread_tls() but still support CLONE_SETTLS via
  copy_thread() expecting the tls to be located in a register argument
  based on clone() are currently unfortunately broken. Their tls value
  will be garbage.

  The patch series fixes this on all architectures that currently define
  __ARCH_WANT_SYS_CLONE3. It also adds a compile-time check to ensure
  that any architecture that enables clone3() in the future is forced to
  also implement copy_thread_tls().

  My ultimate goal is to get rid of the copy_thread()/copy_thread_tls()
  split and just have copy_thread_tls() at some point in the not too
  distant future (Maybe even renaming copy_thread_tls() back to simply
  copy_thread() once the old function is ripped from all arches). This
  is dependent now on all arches supporting clone3().

  While all relevant arches do that now there are still four missing:
  ia64, m68k, sh and sparc. They have the system call reserved, but not
  implemented. Once they all implement clone3() we can get rid of
  ARCH_WANT_SYS_CLONE3 and HAVE_COPY_THREAD_TLS.

  This series also includes a minor fix for the arm64 uapi headers which
  caused __NR_clone3 to be missing from the exported user headers.

  Unfortunately the series came in a little late especially given that
  it touches a range of architectures. Due to the holidays not all arch
  maintainers responded in time probably due to their backlog. Will and
  Arnd have thankfully acked the arm specific changes.

  Given that the changes are straightforward and rather minimal combined
  with the fact the that clone3() with CLONE_SETTLS is broken I decided
  to send them post rc3 nonetheless"

* tag 'clone3-tls-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
  um: Implement copy_thread_tls
  clone3: ensure copy_thread_tls is implemented
  xtensa: Implement copy_thread_tls
  riscv: Implement copy_thread_tls
  parisc: Implement copy_thread_tls
  arm: Implement copy_thread_tls
  arm64: Implement copy_thread_tls
  arm64: Move __ARCH_WANT_SYS_CLONE3 definition to uapi headers

4 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
Linus Torvalds [Fri, 10 Jan 2020 21:41:16 +0000 (13:41 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/hid/hid

Pull HID fix from Jiri Kosina:
 "A regression fix for EPOLLOUT handling in hidraw and uhid"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid:
  HID: hidraw, uhid: Always report EPOLLOUT

4 years agoMerge tag 'usb-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Fri, 10 Jan 2020 21:29:40 +0000 (13:29 -0800)]
Merge tag 'usb-5.5-rc6' of git://git./linux/kernel/git/gregkh/usb

Pull USB/PHY fixes from Greg KH:
 "Here are a number of USB and PHY driver fixes for 5.5-rc6

  Nothing all that unusual, just the a bunch of small fixes for a lot of
  different reported issues. The PHY driver fixes are in here as they
  interacted with the usb drivers.

  Full details of the patches are in the shortlog, and all of these have
  been in linux-next with no reported issues"

* tag 'usb-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (24 commits)
  usb: missing parentheses in USE_NEW_SCHEME
  usb: ohci-da8xx: ensure error return on variable error is set
  usb: musb: Disable pullup at init
  usb: musb: fix idling for suspend after disconnect interrupt
  usb: typec: ucsi: Fix the notification bit offsets
  USB: Fix: Don't skip endpoint descriptors with maxpacket=0
  USB-PD tcpm: bad warning+size, PPS adapters
  phy/rockchip: inno-hdmi: round clock rate down to closest 1000 Hz
  usb: chipidea: host: Disable port power only if previously enabled
  usb: cdns3: should not use the same dev_id for shared interrupt handler
  usb: dwc3: gadget: Fix request complete check
  usb: musb: dma: Correct parameter passed to IRQ handler
  usb: musb: jz4740: Silence error if code is -EPROBE_DEFER
  usb: udc: tegra: select USB_ROLE_SWITCH
  USB: core: fix check for duplicate endpoints
  phy: cpcap-usb: Drop extra write to usb2 register
  phy: cpcap-usb: Improve host vs docked mode detection
  phy: cpcap-usb: Prevent USB line glitches from waking up modem
  phy: mapphone-mdm6600: Fix uninitialized status value regression
  phy: cpcap-usb: Fix flakey host idling and enumerating of devices
  ...

4 years agoMerge tag 'char-misc-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Fri, 10 Jan 2020 21:25:24 +0000 (13:25 -0800)]
Merge tag 'char-misc-5.5-rc6' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc fix from Greg KH:
 "Here is a single fix, for the chrdev core, for 5.5-rc6

  There's been a long-standing race condition triggered by syzbot, and
  occasionally real people, in the chrdev open() path. Will finally took
  the time to track it down and fix it for real before the holidays.

  Here's that one patch, it's been in linux-next for a while with no
  reported issues and it does fix the reported problem"

* tag 'char-misc-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  chardev: Avoid potential use-after-free in 'chrdev_open()'

4 years agoMerge tag 'staging-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Fri, 10 Jan 2020 21:22:11 +0000 (13:22 -0800)]
Merge tag 'staging-5.5-rc6' of git://git./linux/kernel/git/gregkh/staging

Pull staging fixes from Greg KH:
 "Here are some small staging driver fixes for 5.5-rc6.

  Nothing major here, just some small fixes for a comedi driver, the
  vt6656 driver, and a new device id for the rtl8188eu driver.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: rtl8188eu: Add device code for TP-Link TL-WN727N v5.21
  staging: comedi: adv_pci1710: fix AI channels 16-31 for PCI-1713
  staging: vt6656: set usb_set_intfdata on driver fail.
  staging: vt6656: remove bool from vnt_radio_power_on ret
  staging: vt6656: limit reg output to block size
  staging: vt6656: correct return of vnt_init_registers.
  staging: vt6656: Fix non zero logical return of, usb_control_msg

4 years agoMerge tag 'tty-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Fri, 10 Jan 2020 21:17:21 +0000 (13:17 -0800)]
Merge tag 'tty-5.5-rc6' of git://git./linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
 "Here are two tty/serial driver fixes for 5.5-rc6.

  The first fixes a much much reported issue with a previous tty port
  link patch that is in your tree, and the second fixes a problem where
  the serdev driver would claim ACPI devices that it shouldn't be
  claiming.

  Both have been in linux-next for a while with no reported issues"

* tag 'tty-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  serdev: Don't claim unsupported ACPI serial devices
  tty: always relink the port

4 years agoMerge tag 'block-5.5-2020-01-10' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 10 Jan 2020 20:05:26 +0000 (12:05 -0800)]
Merge tag 'block-5.5-2020-01-10' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "A few fixes that should go into this round.

  This pull request contains two NVMe fixes via Keith, removal of a dead
  function, and a fix for the bio op for read truncates (Ming)"

* tag 'block-5.5-2020-01-10' of git://git.kernel.dk/linux-block:
  nvmet: fix per feat data len for get_feature
  nvme: Translate more status codes to blk_status_t
  fs: move guard_bio_eod() after bio_set_op_attrs
  block: remove unused mp_bvec_last_segment

4 years agoMerge tag 'io_uring-5.5-2020-01-10' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 10 Jan 2020 20:03:12 +0000 (12:03 -0800)]
Merge tag 'io_uring-5.5-2020-01-10' of git://git.kernel.dk/linux-block

Pull io_uring fix from Jens Axboe:
 "Single fix for this series, fixing a regression with the short read
  handling.

  This just removes it, as it cannot safely be done for all cases"

* tag 'io_uring-5.5-2020-01-10' of git://git.kernel.dk/linux-block:
  io_uring: remove punt of short reads to async context

4 years agoMerge tag 'mtd/fixes-for-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 10 Jan 2020 19:57:10 +0000 (11:57 -0800)]
Merge tag 'mtd/fixes-for-5.5-rc6' of git://git./linux/kernel/git/mtd/linux

Pull MTD fixes from Miquel Raynal:
 "MTD:
   - sm_ftl: Fix NULL pointer warning.

  Raw NAND:
   - Cadence: fix compile testing.
   - STM32: Avoid locking.

  Onenand:
   - Fix several sparse/build warnings.

  SPI-NOR:
   - Add a flag to fix interaction with Micron parts"

* tag 'mtd/fixes-for-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux:
  mtd: spi-nor: Fix the writing of the Status Register on micron flashes
  mtd: sm_ftl: fix NULL pointer warning
  mtd: onenand: omap2: Pass correct flags for prep_dma_memcpy
  mtd: onenand: samsung: Fix iomem access with regular memcpy
  mtd: onenand: omap2: Fix errors in style
  mtd: cadence: Fix cast to pointer from integer of different size warning
  mtd: rawnand: stm32_fmc2: avoid to lock the CPU bus

4 years agoMerge tag 'sound-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Fri, 10 Jan 2020 19:52:36 +0000 (11:52 -0800)]
Merge tag 'sound-5.5-rc6' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "A few piled ASoC fixes and usual HD-audio and USB-audio fixups. Some
  of them are for ASoC core error-handling"

* tag 'sound-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda: enable regmap internal locking
  ALSA: hda/realtek - Add quirk for the bass speaker on Lenovo Yoga X1 7th gen
  ALSA: hda/realtek - Set EAPD control to default for ALC222
  ALSA: usb-audio: Apply the sample rate quirk for Bose Companion 5
  ALSA: hda/realtek - Add new codec supported for ALCS1200A
  ASoC: Intel: boards: Fix compile-testing RT1011/RT5682
  ASoC: SOF: imx8: Fix dsp_box offset
  ASoC: topology: Prevent use-after-free in snd_soc_get_pcm_runtime()
  ASoC: fsl_audmix: add missed pm_runtime_disable
  ASoC: stm32: spdifrx: fix input pin state management
  ASoC: stm32: spdifrx: fix race condition in irq handler
  ASoC: stm32: spdifrx: fix inconsistent lock state
  ASoC: core: Fix access to uninitialized list heads
  ASoC: soc-core: Set dpcm_playback / dpcm_capture
  ASoC: SOF: imx8: fix memory allocation failure check on priv->pd_dev
  ASoC: SOF: Intel: hda: hda-dai: fix oops on hda_link .hw_free
  ASoC: SOF: fix fault at driver unload after failed probe

4 years agoMerge tag 'thermal-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal...
Linus Torvalds [Fri, 10 Jan 2020 19:48:37 +0000 (11:48 -0800)]
Merge tag 'thermal-v5.5-rc5' of git://git./linux/kernel/git/thermal/linux

Pull thermal fix from Daniel Lezcano:
 "Fix backward compatibility with old DTBs on QCOM tsens (Amit
  Kucheria)"

* tag 'thermal-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux:
  drivers: thermal: tsens: Work with old DTBs

4 years agoMerge tag 'pm-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Fri, 10 Jan 2020 19:46:59 +0000 (11:46 -0800)]
Merge tag 'pm-5.5-rc6' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Prevent the cpufreq-dt driver from probing Tegra20/30 (Dmitry
  Osipenko) and prevent the Intel RAPL power capping driver from
  crashing during CPU initialization due to a NULL pointer dereference
  if the processor model in use is not known to it (Harry Pan)"

* tag 'pm-5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  powercap: intel_rapl: add NULL pointer check to rapl_mmio_cpu_online()
  cpufreq: dt-platdev: Blacklist NVIDIA Tegra20 and Tegra30 SoCs

4 years agonvmet: fix per feat data len for get_feature
Amit Engel [Tue, 7 Jan 2020 16:47:24 +0000 (01:47 +0900)]
nvmet: fix per feat data len for get_feature

The existing implementation for the get_feature admin-cmd does not
use per-feature data len. This patch introduces a new helper function
nvmet_feat_data_len(), which is used to calculate per feature data len.
Right now we only set data len for fid 0x81 (NVME_FEAT_HOST_ID).

Fixes: commit e9061c397839 ("nvmet: Remove the data_len field from the nvmet_req struct")

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Amit Engel <amit.engel@dell.com>
[endiness, naming, and kernel style fixes]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agonvme: Translate more status codes to blk_status_t
Keith Busch [Thu, 5 Dec 2019 19:50:44 +0000 (04:50 +0900)]
nvme: Translate more status codes to blk_status_t

Decode interrupted command and not ready namespace nvme status codes to
BLK_STS_TARGET. These are not generic IO errors and should use a non-path
specific error so that it can use the non-failover retry path.

Reported-by: John Meneghini <John.Meneghini@netapp.com>
Cc: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoHID: hidraw, uhid: Always report EPOLLOUT
Jiri Kosina [Fri, 10 Jan 2020 14:32:51 +0000 (15:32 +0100)]
HID: hidraw, uhid: Always report EPOLLOUT

hidraw and uhid device nodes are always available for writing so we should
always report EPOLLOUT and EPOLLWRNORM bits, not only in the cases when
there is nothing to read.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes: be54e7461ffdc ("HID: uhid: Fix returning EPOLLOUT from uhid_char_poll")
Fixes: 9f3b61dc1dd7b ("HID: hidraw: Fix returning EPOLLOUT from hidraw_poll")
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
4 years agoMerge branch 'powercap'
Rafael J. Wysocki [Fri, 10 Jan 2020 09:58:45 +0000 (10:58 +0100)]
Merge branch 'powercap'

* powercap:
  powercap: intel_rapl: add NULL pointer check to rapl_mmio_cpu_online()

4 years agoMerge tag 'pstore-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...
Linus Torvalds [Fri, 10 Jan 2020 05:42:05 +0000 (21:42 -0800)]
Merge tag 'pstore-v5.5-rc6' of git://git./linux/kernel/git/kees/linux

Pull pstore fix from Kees Cook:
 "Cengiz Can forwarded a Coverity report about more problems with a rare
  pstore initialization error path, so the allocation lifetime was
  rearranged to avoid needing to share the kfree() responsibilities
  between caller and callee"

* tag 'pstore-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore/ram: Regularize prz label allocation lifetime

4 years agoMerge tag 'drm-fixes-2020-01-10' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 10 Jan 2020 05:37:39 +0000 (21:37 -0800)]
Merge tag 'drm-fixes-2020-01-10' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Pre-LCA pull request I'm not sure how things will look next week,
  myself and Daniel are at LCA and I'm speaking quite late, so if I get
  my talk finished I'll probably process fixes.

  This week has a bunch of i915 fixes, some amdgpu fixes, one sun4i, one
  core MST, and one core fb_helper fix. More details below:

  core:
   - mst Fix NO_STOP_BIT bit offset (Wayne)

  fb_helper:
   - fb_helper: Fix bits_per_pixel param set behavior to round up
     (Geert)

  sun4i:
   - Fix RGB_DIV clock min divider on old hardware (Chen-Yu)

  amdgpu:
   - Stability fix for raven
   - Reduce pixel encoding to if max clock is exceeded on HDMI to allow
     additional high res modes
   - enable DRIVER_SYNCOBJ_TIMELINE for amdgpu

  i915:
   - Fix GitLab issue #446 causing GPU hangs: Do not restore invalid RS
     state
   - Fix GitLab issue #846: Restore coarse power gating that was
     disabled by initial RC66 context corruption security fixes.
   - Revert f6ec9483091f ("drm/i915: extend audio CDCLK>=2*BCLK
     constraint to more platforms") to avoid screen flicker
   - Fix to fill in unitialized uabi_instance in virtual engine uAPI
   - Add two missing W/As for ICL and EHL"

* tag 'drm-fixes-2020-01-10' of git://anongit.freedesktop.org/drm/drm:
  drm/amdgpu: add DRIVER_SYNCOBJ_TIMELINE to amdgpu
  drm/amd/display: Reduce HDMI pixel encoding if max clock is exceeded
  Revert "drm/amdgpu: Set no-retry as default."
  drm/fb-helper: Round up bits_per_pixel if possible
  drm/sun4i: tcon: Set RGB DCLK min. divider based on hardware model
  drm/i915/dp: Disable Port sync mode correctly on teardown
  drm/i915: Add Wa_1407352427:icl,ehl
  drm/i915: Add Wa_1408615072 and Wa_1407596294 to icl,ehl
  drm/i915/gt: Restore coarse power gating
  drm/i915/gt: Do not restore invalid RS state
  drm/i915: Limit audio CDCLK>=2*BCLK constraint back to GLK only
  drm/i915/gt: Mark up virtual engine uabi_instance
  drm/dp_mst: correct the shifting in DP_REMOTE_I2C_READ

4 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
Linus Torvalds [Fri, 10 Jan 2020 05:03:54 +0000 (21:03 -0800)]
Merge tag 'for-linus' of git://git./linux/kernel/git/rdma/rdma

Pull rdma fixes from Jason Gunthorpe:
 "First RDMA subsystem updates for 5.5-rc. A very small set of fixes,
  most people seem to still be recovering from December!

  Five small driver fixes:

   - Fix error flow with MR allocation in bnxt_re

   - An errata work around for bnxt_re

   - Misuse of the workqueue API in hfi1

   - Protocol error in hfi1

   - Regression in 5.5 related to the mmap rework with i40iw"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  i40iw: Remove setting of VMA private data and use rdma_user_mmap_io
  IB/hfi1: Adjust flow PSN with the correct resync_psn
  IB/hfi1: Don't cancel unused work item
  RDMA/bnxt_re: Fix Send Work Entry state check while polling completions
  RDMA/bnxt_re: Avoid freeing MR resources if dereg fails

4 years agoMerge tag 'drm-intel-fixes-2020-01-09-1' of git://anongit.freedesktop.org/drm/drm...
Dave Airlie [Fri, 10 Jan 2020 01:43:02 +0000 (11:43 +1000)]
Merge tag 'drm-intel-fixes-2020-01-09-1' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

- Fix GitLab issue #446 causing GPU hangs: Do not restore invalid RS state
- Fix GitLab issue #846: Restore coarse power gating that was disabled
  by initial RC66 context corruption security fixes.
- Revert f6ec9483091f ("drm/i915: extend audio CDCLK>=2*BCLK constraint to more platforms")
  to avoid screen flicker
- Fix to fill in unitialized uabi_instance in virtual engine uAPI
- Add two missing W/As for ICL and EHL

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200109133458.GA15558@jlahtine-desk.ger.corp.intel.com
4 years agoMerge tag 'gpio-v5.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...
Linus Torvalds [Thu, 9 Jan 2020 23:43:35 +0000 (15:43 -0800)]
Merge tag 'gpio-v5.5-3' of git://git./linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "Here is a host of GPIO fixes for the v5.5 series. The ACPI fix is
  especially important, see summary below and in the commit for details:

   - Select GPIOLIB_IRQCHIP on the max77620 GPIO expander

   - Fix context restore in the Zynq driver

   - Create a new ACPI quirk handler for disabling wakeups on
     problematic hardware.

   - Fix a coding style issue on the mockup device"

* tag 'gpio-v5.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpiolib: acpi: Add honor_wakeup module-option + quirk mechanism
  gpiolib: acpi: Turn dmi_system_id table into a generic quirk table
  gpio: zynq: Fix for bug in zynq_gpio_restore_context API
  gpio: max77620: Add missing dependency on GPIOLIB_IRQCHIP
  gpio: mockup: fix coding style

4 years agoMerge tag 'pinctrl-v5.5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
Linus Torvalds [Thu, 9 Jan 2020 23:41:54 +0000 (15:41 -0800)]
Merge tag 'pinctrl-v5.5-4' of git://git./linux/kernel/git/linusw/linux-pinctrl

Pull pin control fixes from Linus Walleij:
 "Two fixes for pin control, not much to say about it, it's just regular
  driver fixes:

   - Fix erroneous shift in the Meson driver

   - Make Lochnagar select the GPIOLIB Kconfig symbol"

* tag 'pinctrl-v5.5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: meson: Fix wrong shift value when get drive-strength
  pinctrl: lochnagar: select GPIOLIB

4 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Thu, 9 Jan 2020 23:37:40 +0000 (15:37 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

Pull input fixes from Dmitry Torokhov:
 "Just a few small fixups here"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: imx_sc_key - only take the valid data from SCU firmware as key state
  Input: add safety guards to input_set_keycode()
  Input: input_event - fix struct padding on sparc64
  Input: uinput - always report EPOLLOUT

4 years agoi2c: fix bus recovery stop mode timing
Russell King [Sun, 15 Dec 2019 16:39:05 +0000 (16:39 +0000)]
i2c: fix bus recovery stop mode timing

The I2C specification states that tsu:sto for standard mode timing must
be at minimum 4us. Pictographically, this is:

SCL: ____/~~~~~~~~~
SDA: _________/~~~~
       ->|    |<- 4us minimum

We are currently waiting 2.5us between asserting SCL and SDA, which is
in violation of the standard. Adjust the timings to ensure that we meet
what is stipulated as the minimum timings to ensure that all devices
correctly interpret the STOP bus transition.

This is more important than trying to generate a square wave with even
duty cycle.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
4 years agomtd: spi-nor: Fix the writing of the Status Register on micron flashes
Tudor Ambarus [Tue, 3 Dec 2019 14:50:01 +0000 (14:50 +0000)]
mtd: spi-nor: Fix the writing of the Status Register on micron flashes

Micron flashes do not support 16 bit writes on the Status Register.
According to micron datasheets, when using the Write Status Register
(01h) command, the chip select should be driven LOW and held LOW until
the eighth bit of the last data byte has been latched in, after which
it must be driven HIGH. If CS is not driven HIGH, the command is not
executed, flag status register error bits are not set, and the write enable
latch remains set to 1. This fixes the lock operations on micron flashes.

Reported-by: John Garry <john.garry@huawei.com>
Fixes: 39d1e3340c73 ("mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Tested-by: John Garry <john.garry@huawei.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
4 years agomtd: sm_ftl: fix NULL pointer warning
Arnd Bergmann [Tue, 7 Jan 2020 21:24:52 +0000 (22:24 +0100)]
mtd: sm_ftl: fix NULL pointer warning

With gcc -O3, we get a new warning:

In file included from arch/arm64/include/asm/processor.h:28,
                 from drivers/mtd/sm_ftl.c:8:
In function 'memset',
    inlined from 'sm_read_sector.constprop' at drivers/mtd/sm_ftl.c:250:3:
include/linux/string.h:411:9: error: argument 1 null where non-null expected [-Werror=nonnull]
  return __builtin_memset(p, c, size);

>From all I can tell, this cannot happen (the function is called
either with a NULL buffer or with a -1 block number but not both),
but adding a check makes it more robust and avoids the warning.

Fixes: mmtom ("init/Kconfig: enable -O3 for all arches")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>