Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 136 insertions, 0 deletions

diff --git a/Documentation/tools/rtla/rtla-timerlat-top.rst b/Documentation/tools/rtla/rtla-timerlat-top.rst
new file mode 100644
index 000000000..05959f1a4
--- /dev/null
+++ b/Documentation/tools/rtla/rtla-timerlat-top.rst
@@ -0,0 +1,136 @@
+.. |tool| replace:: timerlat top
+
+====================
+rtla-timerlat-top
+====================
+-------------------------------------------
+Measures the operating system timer latency
+-------------------------------------------
+
+:Manual section: 1
+
+SYNOPSIS
+========
+**rtla timerlat top** [*OPTIONS*] ...
+
+DESCRIPTION
+===========
+
+.. include:: common_timerlat_description.txt
+
+The **rtla timerlat top** displays a summary of the periodic output
+from the *timerlat* tracer. It also provides information for each
+operating system noise via the **osnoise:** tracepoints that can be
+seen with the option **-T**.
+
+OPTIONS
+=======
+
+.. include:: common_timerlat_options.txt
+
+.. include:: common_top_options.txt
+
+.. include:: common_options.txt
+
+.. include:: common_timerlat_aa.txt
+
+**--aa-only** *us*
+
+        Set stop tracing conditions and run without collecting and displaying statistics.
+        Print the auto-analysis if the system hits the stop tracing condition. This option
+        is useful to reduce rtla timerlat CPU, enabling the debug without the overhead of
+        collecting the statistics.
+
+EXAMPLE
+=======
+
+In the example below, the timerlat tracer is dispatched in cpus *1-23* in the
+automatic trace mode, instructing the tracer to stop if a *40 us* latency or
+higher is found::
+
+  # timerlat -a 40 -c 1-23 -q
+                                     Timer Latency
+    0 00:00:12   |          IRQ Timer Latency (us)        |         Thread Timer Latency (us)
+  CPU COUNT      |      cur       min       avg       max |      cur       min       avg       max
+    1 #12322     |        0         0         1        15 |       10         3         9        31
+    2 #12322     |        3         0         1        12 |       10         3         9        23
+    3 #12322     |        1         0         1        21 |        8         2         8        34
+    4 #12322     |        1         0         1        17 |       10         2        11        33
+    5 #12322     |        0         0         1        12 |        8         3         8        25
+    6 #12322     |        1         0         1        14 |       16         3        11        35
+    7 #12322     |        0         0         1        14 |        9         2         8        29
+    8 #12322     |        1         0         1        22 |        9         3         9        34
+    9 #12322     |        0         0         1        14 |        8         2         8        24
+   10 #12322     |        1         0         0        12 |        9         3         8        24
+   11 #12322     |        0         0         0        15 |        6         2         7        29
+   12 #12321     |        1         0         0        13 |        5         3         8        23
+   13 #12319     |        0         0         1        14 |        9         3         9        26
+   14 #12321     |        1         0         0        13 |        6         2         8        24
+   15 #12321     |        1         0         1        15 |       12         3        11        27
+   16 #12318     |        0         0         1        13 |        7         3        10        24
+   17 #12319     |        0         0         1        13 |       11         3         9        25
+   18 #12318     |        0         0         0        12 |        8         2         8        20
+   19 #12319     |        0         0         1        18 |       10         2         9        28
+   20 #12317     |        0         0         0        20 |        9         3         8        34
+   21 #12318     |        0         0         0        13 |        8         3         8        28
+   22 #12319     |        0         0         1        11 |        8         3        10        22
+   23 #12320     |       28         0         1        28 |       41         3        11        41
+  rtla timerlat hit stop tracing
+  ## CPU 23 hit stop tracing, analyzing it ##
+  IRQ handler delay:                                        27.49 us (65.52 %)
+  IRQ latency:                                              28.13 us
+  Timerlat IRQ duration:                                     9.59 us (22.85 %)
+  Blocking thread:                                           3.79 us (9.03 %)
+                         objtool:49256                       3.79 us
+    Blocking thread stacktrace
+                -> timerlat_irq
+                -> __hrtimer_run_queues
+                -> hrtimer_interrupt
+                -> __sysvec_apic_timer_interrupt
+                -> sysvec_apic_timer_interrupt
+                -> asm_sysvec_apic_timer_interrupt
+                -> _raw_spin_unlock_irqrestore
+                -> cgroup_rstat_flush_locked
+                -> cgroup_rstat_flush_irqsafe
+                -> mem_cgroup_flush_stats
+                -> mem_cgroup_wb_stats
+                -> balance_dirty_pages
+                -> balance_dirty_pages_ratelimited_flags
+                -> btrfs_buffered_write
+                -> btrfs_do_write_iter
+                -> vfs_write
+                -> __x64_sys_pwrite64
+                -> do_syscall_64
+                -> entry_SYSCALL_64_after_hwframe
+  ------------------------------------------------------------------------
+    Thread latency:                                          41.96 us (100%)
+
+  The system has exit from idle latency!
+    Max timerlat IRQ latency from idle: 17.48 us in cpu 4
+  Saving trace to timerlat_trace.txt
+
+In this case, the major factor was the delay suffered by the *IRQ handler*
+that handles **timerlat** wakeup: *65.52%*. This can be caused by the
+current thread masking interrupts, which can be seen in the blocking
+thread stacktrace: the current thread (*objtool:49256*) disabled interrupts
+via *raw spin lock* operations inside mem cgroup, while doing write
+syscall in a btrfs file system.
+
+The raw trace is saved in the **timerlat_trace.txt** file for further analysis.
+
+Note that **rtla timerlat** was dispatched without changing *timerlat* tracer
+threads' priority. That is generally not needed because these threads have
+priority *FIFO:95* by default, which is a common priority used by real-time
+kernel developers to analyze scheduling delays.
+
+SEE ALSO
+--------
+**rtla-timerlat**\(1), **rtla-timerlat-hist**\(1)
+
+`Timerlat tracer <https://docs.kernel.org/trace/timerlat-tracer.html>`__
+
+AUTHOR
+------
+Written by Daniel Bristot de Oliveira <bristot@kernel.org>
+
+.. include:: common_appendix.txt