Add a new document Documentation/trace/debugging.rst that will hold
various ways to debug tracing.

This initial version mentions trace_printk and how to create persistent
buffers that can last across bootups.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineeth Pillai <vineeth@bitbyteword.org>
Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Alexander Aring <aahringo@redhat.com>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Jonathan Corbet" <corbet@lwn.net>
Link: https://lore.kernel.org/20240823014019.702433486@goodmis.orgSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Add a option "trace_printk_dest" that will make the tracing instance the
location that trace_printk() will go to. This is useful if the
trace_printk or one of the top level tracers is too noisy and there's a
need to separate the two. Then an instance can be created, the
trace_printk can be set to go there instead, where it will not be lost in
the noise of the top level tracer.

Note, only one instance can be the destination of trace_printk at a time.
If an instance sets this flag, the instance that had it set will have it
cleared. There is always one instance that has this set. By default, that
is the top instance. This flag cannot be cleared from the top instance.
Doing so will result in an -EINVAL. The only way this flag can be cleared
from the top instance is by another instance setting it.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineeth Pillai <vineeth@bitbyteword.org>
Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Alexander Aring <aahringo@redhat.com>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Jonathan Corbet" <corbet@lwn.net>
Link: https://lore.kernel.org/20240823014019.545459018@goodmis.orgSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

If the persistent boot mapped ring buffer is used for trace_printk(),
force it to not use the binary versions. trace_printk() by default uses
bin_printf() that only saves the pointer to the format and not the format
itself inside the ring buffer. But for a persistent buffer that is read
after reboot, the pointers to the format strings may not be the same, or
worse, not even exist! Instead, just force the more robust, but slower,
version that does the formatting before saving into the ring buffer.

The boot mapped buffer can now be used for trace_printk and friends!

Using the trace_printk() and the persistent buffer was used to debug the
issue with the osnoise tracer:

Link: https://lore.kernel.org/all/20240822103443.6a6ae051@gandalf.local.home/

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineeth Pillai <vineeth@bitbyteword.org>
Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Alexander Aring <aahringo@redhat.com>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Jonathan Corbet" <corbet@lwn.net>
Link: https://lore.kernel.org/20240823014019.386925800@goodmis.orgSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Currently, trace_printk() just goes to the top level ring buffer. But
there may be times that it should go to one of the instances created by
the kernel command line.

Add a new trace_instance flag: traceprintk (also can use "printk" or
"trace_printk" as people tend to forget the actual flag name).

  trace_instance=foo^traceprintk

Will assign the trace_printk to this buffer at boot up.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineeth Pillai <vineeth@bitbyteword.org>
Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Alexander Aring <aahringo@redhat.com>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Jonathan Corbet" <corbet@lwn.net>
Link: https://lore.kernel.org/20240823014019.226694946@goodmis.orgSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Add a "flags" delimiter (^) to the "trace_instance" kernel command line
parameter, and add the "traceoff" flag. The format is:

   trace_instance=<name>[^<flag1>[^<flag2>]][@<memory>][,<events>]

The code allows for more than one flag to be added, but currently only
"traceoff" is done so.

The motivation for this change came from debugging with the persistent
ring buffer and having trace_printk() writing to it. The trace_printk
calls are always enabled, and the boot after the crash was having the
unwanted trace_printks from the current boot inject into the ring buffer
with the trace_printks of the crash kernel, making the output very
confusing.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineeth Pillai <vineeth@bitbyteword.org>
Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Alexander Aring <aahringo@redhat.com>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Jonathan Corbet" <corbet@lwn.net>
Link: https://lore.kernel.org/20240823014019.053229958@goodmis.orgSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Previously, the mapped ring-buffer layout caused misalignment between
the meta-page and sub-buffers when the sub-buffer size was not a
multiple of PAGE_SIZE. This prevented hardware with larger TLB entries
from utilizing them effectively.

Add a padding with the zero-page between the meta-page and sub-buffers.
Also update the ring-buffer map_test to verify that padding.

Link: https://lore.kernel.org/20240628104611.1443542-1-vdonnefort@google.comSigned-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Add a magic number as well as save the struct size of the ring_buffer_meta
structure in the meta data to also use as validation. Updating the magic
number could be used to force a invalidation between kernel versions, and
saving the structure size is also a good method to make sure the content
is what is expected.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/20240815115032.0c197b32@rorschach.local.homeSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

The text and data address is saved in the meta data so that it can be used
to know the delta of the text and data addresses of the last boot compared
to the text and data addresses of the current boot. The delta is used to
convert function pointer entries in the ring buffer to something that can
be used by kallsyms (note this only works for built-in functions).

But the saved addresses get reset on boot up. If the buffer is not used
and there's another reboot, then the saved text and data addresses will be
of the last boot and not that of the boot that created the content in the
ring buffer.

To get an idea of the issue:

 # trace-cmd start -B boot_mapped -p function
 # reboot
 # trace-cmd show -B boot_mapped | tail
           <...>-1       [000] d..1.   461.983243: native_apic_msr_write <-native_kick_ap
           <...>-1       [000] d..1.   461.983244: __pfx_native_apic_msr_eoi <-native_kick_ap
           <...>-1       [000] d..1.   461.983244: reserve_irq_vector_locked <-native_kick_ap
           <...>-1       [000] d..1.   461.983262: branch_emulate_op <-native_kick_ap
           <...>-1       [000] d..1.   461.983262: __ia32_sys_ia32_pread64 <-native_kick_ap
           <...>-1       [000] d..1.   461.983263: native_kick_ap <-__smpboot_create_thread
           <...>-1       [000] d..1.   461.983263: store_cache_disable <-native_kick_ap
           <...>-1       [000] d..1.   461.983279: acpi_power_off_prepare <-native_kick_ap
           <...>-1       [000] d..1.   461.983280: __pfx_acpi_ns_delete_node <-acpi_suspend_enter
           <...>-1       [000] d..1.   461.983280: __pfx_acpi_os_release_lock <-acpi_suspend_enter
 # reboot
 # trace-cmd show -B boot_mapped  |tail
           <...>-1       [000] d..1.   461.983243: 0xffffffffa9669220 <-0xffffffffa965f3db
           <...>-1       [000] d..1.   461.983244: 0xffffffffa96690f0 <-0xffffffffa965f3db
           <...>-1       [000] d..1.   461.983244: 0xffffffffa9663fa0 <-0xffffffffa965f3db
           <...>-1       [000] d..1.   461.983262: 0xffffffffa9672e80 <-0xffffffffa965f3e0
           <...>-1       [000] d..1.   461.983262: 0xffffffffa962b940 <-0xffffffffa965f3ec
           <...>-1       [000] d..1.   461.983263: 0xffffffffa965f540 <-0xffffffffa96e1362
           <...>-1       [000] d..1.   461.983263: 0xffffffffa963c940 <-0xffffffffa965f55b
           <...>-1       [000] d..1.   461.983279: 0xffffffffa9ee30c0 <-0xffffffffa965f59b
           <...>-1       [000] d..1.   461.983280: 0xffffffffa9f16c10 <-0xffffffffa9ee3157
           <...>-1       [000] d..1.   461.983280: 0xffffffffa9ee02e0 <-0xffffffffa9ee3157

By not updating the saved text and data addresses in the meta data at
every boot up and only updating them when the buffer is reset, it
allows multiple boots to see the same data.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/20240815113629.0dc90af8@rorschach.local.homeSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Update the function graph code to modify the function addresses for a
previous boot buffer so that it matches the current kallsyms (note this
does not handle module addresses, yet).

After a reboot, instead of seeing:

 # trace-cmd show -B boot_mapped | tail -n30
       swapper/0-1       [000] d..2.    56.286470:  0)   0.481 us    |                    0xffffffff925da5c4();
       swapper/0-1       [000] d....    56.286471:  0)   4.065 us    |                  }
       swapper/0-1       [000] d....    56.286471:  0)   4.920 us    |                }
       swapper/0-1       [000] d..1.    56.286472:  0)               |                0xffffffff92536254() {
       swapper/0-1       [000] d..1.    56.286472:  0) + 28.974 us   |                  0xffffffff92534e30();
       swapper/0-1       [000] d....    56.286516:  0) + 43.881 us   |                }
       swapper/0-1       [000] d..1.    56.286517:  0)               |                0xffffffff925136c4() {
       swapper/0-1       [000] d..1.    56.286518:  0)               |                  0xffffffff92514a14() {
       swapper/0-1       [000] d..1.    56.286518:  0)   6.003 us    |                    0xffffffff92514200();
       swapper/0-1       [000] d....    56.286529:  0) + 11.510 us   |                  }
       swapper/0-1       [000] d....    56.286529:  0) + 12.895 us   |                }
       swapper/0-1       [000] d....    56.286530:  0) ! 382.884 us  |              }
       swapper/0-1       [000] d..1.    56.286530:  0)               |              0xffffffff92536444() {
       swapper/0-1       [000] d..1.    56.286531:  0)               |                0xffffffff92536254() {
       swapper/0-1       [000] d..1.    56.286531:  0) + 26.335 us   |                  0xffffffff92534e30();
       swapper/0-1       [000] d....    56.286560:  0) + 29.511 us   |                }
       swapper/0-1       [000] d....    56.286561:  0) + 30.452 us   |              }
       swapper/0-1       [000] d..1.    56.286562:  0)               |              0xffffffff9253c014() {
       swapper/0-1       [000] d..1.    56.286562:  0)               |                0xffffffff9253bed4() {
       swapper/0-1       [000] d..1.    56.286563:  0) + 13.465 us   |                  0xffffffff92536684();
       swapper/0-1       [000] d....    56.286577:  0) + 14.651 us   |                }
       swapper/0-1       [000] d....    56.286577:  0) + 15.821 us   |              }
       swapper/0-1       [000] d..1.    56.286578:  0)   0.667 us    |              0xffffffff92547074();
       swapper/0-1       [000] d..1.    56.286579:  0)   0.453 us    |              0xffffffff924f35c4();
       swapper/0-1       [000] d....    56.286580:  0) # 3906.348 us |            }
       swapper/0-1       [000] d..1.    56.286581:  0)               |            0xffffffff92531a14() {
       swapper/0-1       [000] d..1.    56.286581:  0)   0.518 us    |              0xffffffff92505cb4();
       swapper/0-1       [000] d..1.    56.286595:  0)               |              0xffffffff92db83c4() {
       swapper/0-1       [000] d..1.    56.286596:  0)               |                0xffffffff92dec2e4() {
       swapper/0-1       [000] d..1.    56.286597:  0)               |                  0xffffffff92db5304() {

It now shows:

 # trace-cmd show -B boot_mapped | tail -n30
       swapper/0-1       [000] d..2.   363.079099:  0)   0.483 us    |                    preempt_count_sub();
       swapper/0-1       [000] d....   363.079100:  0)   4.112 us    |                  }
       swapper/0-1       [000] d....   363.079101:  0)   4.979 us    |                }
       swapper/0-1       [000] d..1.   363.079101:  0)               |                disable_local_APIC() {
       swapper/0-1       [000] d..1.   363.079102:  0) + 29.153 us   |                  clear_local_APIC.part.0();
       swapper/0-1       [000] d....   363.079148:  0) + 46.517 us   |                }
       swapper/0-1       [000] d..1.   363.079149:  0)               |                mcheck_cpu_clear() {
       swapper/0-1       [000] d..1.   363.079149:  0)               |                  mce_intel_feature_clear() {
       swapper/0-1       [000] d..1.   363.079150:  0)   5.871 us    |                    lmce_supported();
       swapper/0-1       [000] d....   363.079161:  0) + 11.340 us   |                  }
       swapper/0-1       [000] d....   363.079161:  0) + 12.638 us   |                }
       swapper/0-1       [000] d....   363.079162:  0) ! 383.518 us  |              }
       swapper/0-1       [000] d..1.   363.079162:  0)               |              lapic_shutdown() {
       swapper/0-1       [000] d..1.   363.079163:  0)               |                disable_local_APIC() {
       swapper/0-1       [000] d..1.   363.079163:  0) + 26.144 us   |                  clear_local_APIC.part.0();
       swapper/0-1       [000] d....   363.079192:  0) + 29.424 us   |                }
       swapper/0-1       [000] d....   363.079192:  0) + 30.376 us   |              }
       swapper/0-1       [000] d..1.   363.079193:  0)               |              restore_boot_irq_mode() {
       swapper/0-1       [000] d..1.   363.079194:  0)               |                native_restore_boot_irq_mode() {
       swapper/0-1       [000] d..1.   363.079194:  0) + 13.863 us   |                  disconnect_bsp_APIC();
       swapper/0-1       [000] d....   363.079209:  0) + 14.933 us   |                }
       swapper/0-1       [000] d....   363.079209:  0) + 16.009 us   |              }
       swapper/0-1       [000] d..1.   363.079210:  0)   0.694 us    |              hpet_disable();
       swapper/0-1       [000] d..1.   363.079211:  0)   0.511 us    |              iommu_shutdown_noop();
       swapper/0-1       [000] d....   363.079212:  0) # 3980.260 us |            }
       swapper/0-1       [000] d..1.   363.079212:  0)               |            native_machine_emergency_restart() {
       swapper/0-1       [000] d..1.   363.079213:  0)   0.495 us    |              tboot_shutdown();
       swapper/0-1       [000] d..1.   363.079230:  0)               |              acpi_reboot() {
       swapper/0-1       [000] d..1.   363.079231:  0)               |                acpi_reset() {
       swapper/0-1       [000] d..1.   363.079232:  0)               |                  acpi_os_write_port() {

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/20240813171257.478901820@goodmis.orgSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Allow boot instances to use memory reserved by the reserve_mem boot
option.

  reserve_mem=12M:4096:trace  trace_instance=boot_mapped@trace

The above will allocate 12 megs with 4096 alignment and label it "trace".
The second parameter will create a "boot_mapped" instance and use the
memory reserved and labeled as "trace" as the memory for the ring buffer.

That will create an instance called "boot_mapped":

  /sys/kernel/tracing/instances/boot_mapped

Note, because the ring buffer is using a defined memory ranged, it will
act just like a memory mapped ring buffer. It will not have a snapshot
buffer, as it can't swap out the buffer. The snapshot files as well as any
tracers that uses a snapshot will not be present in the boot_mapped
instance.

Also note that reserve_mem is not reliable in acquiring the same physical
memory at each soft reboot. It is possible that KALSR could map the kernel
at the previous boot memory location forcing the reserve_mem to return a
different memory location. In this case, the previous ring buffer will be
lost.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/20240815082811.669f7d8c@gandalf.local.homeSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

The mapping of the ring buffer to memory allocated at boot up will also
expose a "last_boot_info" to help tooling to read the raw data from the
last boot. As instances that have their ring buffer mapped to fixed
memory cannot perform snapshots, they can either have the "snapshot" file
or the "last_boot_info" file, but not both.

The code that added the "last_boot_info" file failed to notice that the
"snapshot" creation was inside a "#ifdef CONFIG_TRACER_SNAPSHOT" and
incorrectly placed the creation of the "last_boot_info" file within the
ifdef block. Not only does it cause a warning when CONFIG_TRACER_SNAPSHOT
is not enabled, it also incorrectly prevents the file from appearing.

Link: https://lore.kernel.org/all/20240719102640.718554-1-arnd@kernel.org/

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reported-by: Arnd Bergmann <arnd@kernel.org>
Link: https://lore.kernel.org/20240719101312.3d4ac707@rorschach.local.home
Fixes: 7a1d1e4b ("tracing/ring-buffer: Add last_boot_info file to boot instance")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

The "reserve_mem" kernel command line parameter has been pulled into
v6.11. Merge the latest -rc3 to allow the persistent ring buffer memory to
be able to be mapped at the address specified by the "reserve_mem" command
line parameter.
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Pull x86 fixes from Thomas Gleixner:

 - Fix 32-bit PTI for real.

   pti_clone_entry_text() is called twice, once before initcalls so that
   initcalls can use the user-mode helper and then again after text is
   set read only. Setting read only on 32-bit might break up the PMD
   mapping, which makes the second invocation of pti_clone_entry_text()
   find the mappings out of sync and failing.

   Allow the second call to split the existing PMDs in the user mapping
   and synchronize with the kernel mapping.

 - Don't make acpi_mp_wake_mailbox read-only after init as the mail box
   must be writable in the case that CPU hotplug operations happen after
   boot. Otherwise the attempt to start a CPU crashes with a write to
   read only memory.

 - Add a missing sanity check in mtrr_save_state() to ensure that the
   fixed MTRR MSRs are supported.

   Otherwise mtrr_save_state() ends up in a #GP, which is fixed up, but
   the WARN_ON() can bring systems down when panic on warn is set.

* tag 'x86-urgent-2024-08-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mtrr: Check if fixed MTRRs exist before saving them
  x86/paravirt: Fix incorrect virt spinlock setting on bare metal
  x86/acpi: Remove __ro_after_init from acpi_mp_wake_mailbox
  x86/mm: Fix PTI for i386 some more

Pull time keeping fixes from Thomas Gleixner:

 - Fix a couple of issues in the NTP code where user supplied values are
   neither sanity checked nor clamped to the operating range. This
   results in integer overflows and eventualy NTP getting out of sync.

   According to the history the sanity checks had been removed in favor
   of clamping the values, but the clamping never worked correctly under
   all circumstances. The NTP people asked to not bring the sanity
   checks back as it might break existing applications.

   Make the clamping work correctly and add it where it's missing

 - If adjtimex() sets the clock it has to trigger the hrtimer subsystem
   so it can adjust and if the clock was set into the future expire
   timers if needed. The caller should provide a bitmask to tell
   hrtimers which clocks have been adjusted.

   adjtimex() uses not the proper constant and uses CLOCK_REALTIME
   instead, which is 0. So hrtimers adjusts only the clocks, but does
   not check for expired timers, which might make them expire really
   late. Use the proper bitmask constant instead.

* tag 'timers-urgent-2024-08-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timekeeping: Fix bogus clock_was_set() invocation in do_adjtimex()
  ntp: Safeguard against time_constant overflow
  ntp: Clamp maxerror and esterror to operating range

Pull irq fixes from Thomas Gleixner:
 "Three small fixes for interrupt core and drivers:

   - The interrupt core fails to honor caller supplied affinity hints
     for non-managed interrupts and uses the system default affinity on
     startup instead. Set the missing flag in the descriptor to tell the
     core to use the provided affinity.

   - Fix a shift out of bounds error in the Xilinx driver

   - Handle switching to level trigger correctly in the RISCV APLIC
     driver. It failed to retrigger the interrupt which causes it to
     become stale"

* tag 'irq-urgent-2024-08-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/riscv-aplic: Retrigger MSI interrupt on source configuration
  irqchip/xilinx: Fix shift out of bounds
  genirq/irqdesc: Honor caller provided affinity in alloc_desc()

Pull USB fixes from Greg KH:
 "Here are a number of small USB driver fixes for reported issues for
  6.11-rc3. Included in here are:

   - usb serial driver MODULE_DESCRIPTION() updates

   - usb serial driver fixes

   - typec driver fixes

   - usb-ip driver fix

   - gadget driver fixes

   - dt binding update

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

* tag 'usb-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usb: typec: ucsi: Fix a deadlock in ucsi_send_command_common()
  usb: typec: tcpm: avoid sink goto SNK_UNATTACHED state if not received source capability message
  usb: gadget: f_fs: pull out f->disable() from ffs_func_set_alt()
  usb: gadget: f_fs: restore ffs_func_disable() functionality
  USB: serial: debug: do not echo input by default
  usb: typec: tipd: Delete extra semi-colon
  usb: typec: tipd: Fix dereferencing freeing memory in tps6598x_apply_patch()
  usb: gadget: u_serial: Set start_delayed during suspend
  usb: typec: tcpci: Fix error code in tcpci_check_std_output_cap()
  usb: typec: fsa4480: Check if the chip is really there
  usb: gadget: core: Check for unset descriptor
  usb: vhci-hcd: Do not drop references before new references are gained
  usb: gadget: u_audio: Check return codes from usb_ep_enable and config_ep_by_speed.
  usb: gadget: midi2: Fix the response for FB info with block 0xff
  dt-bindings: usb: microchip,usb2514: Add USB2517 compatible
  USB: serial: garmin_gps: use struct_size() to allocate pkt
  USB: serial: garmin_gps: annotate struct garmin_packet with __counted_by
  USB: serial: add missing MODULE_DESCRIPTION() macros
  USB: serial: spcp8x5: remove unused struct 'spcp8x5_usb_ctrl_arg'

Pull tty / serial driver fixes from Greg KH:
 "Here are some small tty and serial driver fixes for reported problems
  for 6.11-rc3. Included in here are:

   - sc16is7xx serial driver fixes

   - uartclk bugfix for a divide by zero issue

   - conmakehash userspace build issue fix

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

* tag 'tty-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: vt: conmakehash: cope with abs_srctree no longer in env
  serial: sc16is7xx: fix invalid FIFO access with special register set
  serial: sc16is7xx: fix TX fifo corruption
  serial: core: check uartclk for zero to avoid divide by zero

Merge tag 'driver-core-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core / documentation fixes from Greg KH:
 "Here are some small fixes, and some documentation updates for
  6.11-rc3. Included in here are:

   - embargoed hardware documenation updates based on a lot of review by
     legal-types in lots of companies to try to make the process a _bit_
     easier for us to manage over time.

   - rust firmware documentation fix

   - driver detach race fix for the fix that went into 6.11-rc1

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

* tag 'driver-core-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  driver core: Fix uevent_show() vs driver detach race
  Documentation: embargoed-hardware-issues.rst: add a section documenting the "early access" process
  Documentation: embargoed-hardware-issues.rst: minor cleanups and fixes
  rust: firmware: fix invalid rustdoc link

Pull char/misc fixes from Greg KH:
 "Here are some small char/misc/other driver fixes for 6.11-rc3 for
  reported issues. Included in here are:

   - binder driver fixes

   - fsi MODULE_DESCRIPTION() additions (people seem to love them...)

   - eeprom driver fix

   - Kconfig dependency fix to resolve build issues

   - spmi driver fixes

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

* tag 'char-misc-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  spmi: pmic-arb: add missing newline in dev_err format strings
  spmi: pmic-arb: Pass the correct of_node to irq_domain_add_tree
  binder_alloc: Fix sleeping function called from invalid context
  binder: fix descriptor lookup for context manager
  char: add missing NetWinder MODULE_DESCRIPTION() macros
  misc: mrvl-cn10k-dpi: add PCI_IOV dependency
  eeprom: ee1004: Fix locking issues in ee1004_probe()
  fsi: add missing MODULE_DESCRIPTION() macros

Pull SCSI fixes from James Bottomley:
 "Two core fixes: one to prevent discard type changes (seen on iSCSI)
  during intermittent errors and the other is fixing a lockdep problem
  caused by the queue limits change.

  And one driver fix in ufs"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: sd: Keep the discard mode stable
  scsi: sd: Move sd_read_cpr() out of the q->limits_lock region
  scsi: ufs: core: Fix hba->last_dme_cmd_tstamp timestamp updating logic

Pull nfsd fixes from Chuck Lever:

 - Two minor fixes for recent changes

* tag 'nfsd-6.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  nfsd: don't set SVC_SOCK_ANONYMOUS when creating nfsd sockets
  sunrpc: avoid -Wformat-security warning

Pull i2c fixes from Wolfram Sang:

 - Two fixes for SMBusAlert handling in the I2C core: one to avoid an
   endless loop when scanning for handlers and one to make sure handlers
   are always called even if HW has broken behaviour

 - I2C header build fix for when ACPI is enabled but I2C isn't

 - The testunit gets a rename in the code to match the documentation

 - Two fixes for the Qualcomm GENI I2C controller are cleaning up the
   error exit patch in the runtime_resume() function. The first is
   disabling the clock, the second disables the icc on the way out

* tag 'i2c-for-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: testunit: match HostNotify test name with docs
  i2c: qcom-geni: Add missing geni_icc_disable in geni_i2c_runtime_resume
  i2c: qcom-geni: Add missing clk_disable_unprepare in geni_i2c_runtime_resume
  i2c: Fix conditional for substituting empty ACPI functions
  i2c: smbus: Send alert notifications to all devices if source not found
  i2c: smbus: Improve handling of stuck alerts

Pull dma-mapping fix from Christoph Hellwig:

 - avoid a deadlock with dma-debug and netconsole (Rik van Riel)

* tag 'dma-mapping-6.11-2024-08-10' of git://git.infradead.org/users/hch/dma-mapping:
  dma-debug: avoid deadlock between dma debug vs printk and netconsole

Pull more bcachefs fixes from Kent Overstreet:
 "A couple last minute fixes for the new disk accounting

   - fix a bug that was causing ACLs to seemingly "disappear"

   - new on disk format version, bcachefs_metadata_version_disk_accounting_v3

     bcachefs_metadata_version_disk_accounting_v2 accidentally included
     padding in disk_accounting_key; fortunately, 6.11 isn't out yet so
     we can fix this with another version bump"

* tag 'bcachefs-2024-08-10' of git://evilpiepirate.org/bcachefs:
  bcachefs: bcachefs_metadata_version_disk_accounting_v3
  bcachefs: improve bch2_dev_usage_to_text()
  bcachefs: bch2_accounting_invalid()
  bcachefs: Switch to .get_inode_acl()

The section 4.5.2 of the RISC-V AIA specification says that "any write
to a sourcecfg register of an APLIC might (or might not) cause the
corresponding interrupt-pending bit to be set to one if the rectified
input value is high (= 1) under the new source mode."

When the interrupt type is changed in the sourcecfg register, the APLIC
device might not set the corresponding pending bit, so the interrupt might
never become pending.

To handle sourcecfg register changes for level-triggered interrupts in MSI
mode, manually set the pending bit for retriggering interrupt so it gets
retriggered if it was already asserted.

Fixes: ca8df97f ("irqchip/riscv-aplic: Add support for MSI-mode")
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Vincent Chen <vincent.chen@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240809071049.2454-1-yongxuan.wang@sifive.com

The device tree property 'xlnx,kind-of-intr' is sanity checked that the
bitmask contains only set bits which are in the range of the number of
interrupts supported by the controller.

The check is done by shifting the mask right by the number of supported
interrupts and checking the result for zero.

The data type of the mask is u32 and the number of supported interrupts is
up to 32. In case of 32 interrupts the shift is out of bounds, resulting in
a mismatch warning. The out of bounds condition is also reported by UBSAN:

  UBSAN: shift-out-of-bounds in irq-xilinx-intc.c:332:22
  shift exponent 32 is too large for 32-bit type 'unsigned int'

Fix it by promoting the mask to u64 for the test.

Fixes: d50466c9 ("microblaze: intc: Refactor DT sanity check")
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/1723186944-3571957-1-git-send-email-radhey.shyam.pandey@amd.com

Pull smb client fixes from Steve French:

 - DFS fix

 - fix for security flags for requiring encryption

 - minor cleanup

* tag '6.11-rc2-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: cifs_inval_name_dfs_link_error: correct the check for fullpath
  Fix spelling errors in Server Message Block
  smb3: fix setting SecurityFlags when encryption is required

Pull spi fixes from Mark Brown:
 "A few SPI fixes: clock rate calculation fixes for the Kunpeng and lpsi
  drivers and a missing registration of a device ID for spidev (which
  had only been updated for DT cases, causing warnings)"

* tag 'spi-fix-v6.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: spi-fsl-lpspi: Fix scldiv calculation
  spi: spidev: Add missing spi_device_id for bh2228fv
  spi: hisi-kunpeng: Add verification for the max_frequency provided by the firmware
  spi: hisi-kunpeng: Add validation for the minimum value of speed_hz

bcachefs_metadata_version_disk_accounting_v2 erroneously had padding
bytes in disk_accounting_key, which is a problem because we have to
guarantee that all unused bytes in disk_accounting_key are zeroed.

Fortunately 6.11 isn't out yet, so it's cheap to fix this by spinning a
new version.
Reported-by: Gabriel de Perthuis <g2p.code@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Pull drm fixes from Dave Airlie:
 "Weekly regular fixes, mostly amdgpu with i915/xe having a few each,
  and then some misc bits across the board, seems about right for rc3
  time.

  client:
   - fix null ptr deref

  bridge:
   - connector: fix double free

  atomic:
   - fix async flip update

  panel:
   - document panel

  omap:
   - add config dependency

  tests:
   - fix gem shmem test

  drm buddy:
   - Add start address to trim function

  amdgpu:
   - DMCUB fix
   - Fix DET programming on some DCNs
   - DCC fixes
   - DCN 4.0.1 fixes
   - SMU 14.0.x update
   - MMHUB fix
   - DCN 3.1.4 fix
   - GC 12.0 fixes
   - Fix soft recovery error propogation
   - SDMA 7.0 fixes
   - DSC fix

  xe:
   - Fix off-by-one when processing RTP rules
   - Use dma_fence_chain_free in chain fence unused as a sync
   - Fix PL1 disable flow in xe_hwmon_power_max_write
   - Take ref to VM in delayed dump snapshot

  i915:
   - correct dual pps handling for MTL_PCH+ [display]
   - Adjust vma offset for framebuffer mmap offset [gem]
   - Fix Virtual Memory mapping boundaries calculation [gem]
   - Allow evicting to use the requested placement
   - Attempt to get pages without eviction first"

* tag 'drm-fixes-2024-08-10' of https://gitlab.freedesktop.org/drm/kernel: (31 commits)
  drm/xe: Take ref to VM in delayed snapshot
  drm/xe/hwmon: Fix PL1 disable flow in xe_hwmon_power_max_write
  drm/xe: Use dma_fence_chain_free in chain fence unused as a sync
  drm/xe/rtp: Fix off-by-one when processing rules
  drm/amdgpu: Add DCC GFX12 flag to enable address alignment
  drm/amdgpu: correct sdma7 max dw
  drm/amdgpu: Add address alignment support to DCC buffers
  drm/amd/display: Skip Recompute DSC Params if no Stream on Link
  drm/amdgpu: change non-dcc buffer copy configuration
  drm/amdgpu: Forward soft recovery errors to userspace
  drm/amdgpu: add golden setting for gc v12
  drm/buddy: Add start address support to trim function
  drm/amd/display: Add missing program DET segment call to pipe init
  drm/amd/display: Add missing DCN314 to the DML Makefile
  drm/amdgpu: force to use legacy inv in mmhub
  drm/amd/pm: update powerplay structure on smu v14.0.2/3
  drm/amd/display: Add missing mcache registers
  drm/amd/display: Add dcc propagation value
  drm/amd/display: Add missing DET segments programming
  drm/amd/display: Replace dm_execute_dmub_cmd with dc_wake_and_execute_dmub_cmd
  ...

Add a line for capacity
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Implement bch2_accounting_invalid(); check for junk at the end, and
replicas accounting entries in particular need to be checked or we'll
pop asserts later.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Pull cpumask fix from Yury Norov:
 "Fix for cpumask merge"

[ Mea culpa, this was my mismerge due to too much cut-and-paste - Linus ]

* tag 'bitmap-6.11-rc' of https://github.com/norov/linux:
  cpumask: Fix crash on updating CPU enabled mask

Pull power management fix from Rafael Wysocki:
 "Change the default EPP (energy-performence preference) value for the
  Emerald Rapids processor in the intel_pstate driver.

  Thisshould improve both the performance and energy efficiency (Pedro
  Henrique Kopper)"

* tag 'pm-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: intel_pstate: Update Balance performance EPP for Emerald Rapids

Merge tag 'asm-generic-fixes-6.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pull asm-generic fixes from Arnd Bergmann:
 "There are two more changes to the syscall.tbl conversion: the
  '__NR_newfstat' in the previous bugfix was a mistake and gets reverted
  now, after triple-checking that the contents are now back to what they
  were on all architectures. The __NR_nfsservctl definition is not
  really needed but came up in the same discussion as it had previously
  been defined in uapi/asm-generic/unistd.h and tested for in user
  space.

  There are a few more symbols that used to be defined in the old
  unistd.h file, but that are never defined on any other architecture
  using syscall.tbl format. These used to be needed inside of the
  kernel:

     __NR_syscalls
     __NR_arch_specific_syscall
     __NR3264_*

  Searching for these on https://codesearch.debian.net/ shows a few
  packages (rustc, golang, clamav, libseccomp, librsvg, strace) that
  duplicate all the macros from asm/unistd.h, but nothing that actually
  uses the macros, so I concluded that they are fine to omit after all"

* tag 'asm-generic-fixes-6.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  syscalls: add back legacy __NR_nfsservctl macro
  syscalls: fix fstat() entry again

Pull ARM SoC fixes from Arnd Bergmann:
 "There are three sets of patches for the soc tree:

   - Marek Behún addresses multiple build time regressions caused by
     changes to the cznic turris-omnia support

   - Dmitry Torokhov fixes a regression in the legacy "gumstix" board
     code he cleaned up earlier

   - The TI K3 maintainers found multiple bugs in the in gpio, audio and
     pcie devicetree nodes"

* tag 'arm-fixes-6.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
  ARM: pxa/gumstix: fix attaching properties to vbus gpio device
  doc: platform: cznic: turris-omnia-mcu: Use double backticks for attribute value
  doc: platform: cznic: turris-omnia-mcu: Fix sphinx-build warning
  platform: cznic: turris-omnia-mcu: Make GPIO code optional
  platform: cznic: turris-omnia-mcu: Make poweroff and wakeup code optional
  platform: cznic: turris-omnia-mcu: Make TRNG code optional
  platform: cznic: turris-omnia-mcu: Make watchdog code optional
  arm64: dts: ti: k3-j784s4-main: Correct McASP DMAs
  arm64: dts: ti: k3-j722s: Fix gpio-range for main_pmx0
  arm64: dts: ti: k3-am62p: Fix gpio-range for main_pmx0
  arm64: dts: ti: k3-am62p: Add gpio-ranges for mcu_gpio0
  arm64: dts: ti: k3-am62-verdin-dahlia: Keep CTRL_SLEEP_MOCI# regulator on
  arm64: dts: ti: k3-j784s4-evm: Consolidate serdes0 references
  arm64: dts: ti: k3-j784s4-evm: Assign only lanes 0 and 1 to PCIe1

Merge tag 'probes-fixes-v6.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull kprobe fixes from Masami Hiramatsu:

 - Fix misusing str_has_prefix() parameter order to check symbol prefix
   correctly

 - bpf: remove unused declaring of bpf_kprobe_override

* tag 'probes-fixes-v6.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  kprobes: Fix to check symbol prefixes correctly
  bpf: kprobe: remove unused declaring of bpf_kprobe_override

Pull block fixes from Jens Axboe:
 "Just a set of cleanups for blk-throttle and nvme structures"

* tag 'block-6.11-20240809' of git://git.kernel.dk/linux:
  nvme: reorganize nvme_ns_head fields
  nvme: change data type of lba_shift
  nvme: remove a field from nvme_ns_head
  nvme: remove unused parameter
  blk-throttle: remove more latency dead-code

Pull io_uring fixes from Jens Axboe:
 "Nothing major in here, just two fixes for ensuring that bundle
  recv/send requests always get marked for cleanups, and a single fix to
  ensure that sends with provided buffers only pick a single buffer
  unless the bundle option has been enabled"

* tag 'io_uring-6.11-20240809' of git://git.kernel.dk/linux:
  io_uring/net: don't pick multiple buffers for non-bundle send
  io_uring/net: ensure expanded bundle send gets marked for cleanup
  io_uring/net: ensure expanded bundle recv gets marked for cleanup