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
  ...

2 files changed, 417 insertions, 0 deletions

diff --git a/tools/workqueue/wq_dump.py b/tools/workqueue/wq_dump.py
new file mode 100644
index 000000000..31afc24ef
--- /dev/null
+++ b/tools/workqueue/wq_dump.py
@@ -0,0 +1,249 @@
+#!/usr/bin/env drgn
+#
+# Copyright (C) 2023 Tejun Heo <tj@kernel.org>
+# Copyright (C) 2023 Meta Platforms, Inc. and affiliates.
+
+desc = """
+This is a drgn script to show the current workqueue configuration. For more
+info on drgn, visit https://github.com/osandov/drgn.
+
+Affinity Scopes
+===============
+
+Shows the CPUs that can be used for unbound workqueues and how they will be
+grouped by each available affinity type. For each type:
+
+  nr_pods   number of CPU pods in the affinity type
+  pod_cpus  CPUs in each pod
+  pod_node  NUMA node for memory allocation for each pod
+  cpu_pod   pod that each CPU is associated to
+
+Worker Pools
+============
+
+Lists all worker pools indexed by their ID. For each pool:
+
+  ref       number of pool_workqueue's associated with this pool
+  nice      nice value of the worker threads in the pool
+  idle      number of idle workers
+  workers   number of all workers
+  cpu       CPU the pool is associated with (per-cpu pool)
+  cpus      CPUs the workers in the pool can run on (unbound pool)
+
+Workqueue CPU -> pool
+=====================
+
+Lists all workqueues along with their type and worker pool association. For
+each workqueue:
+
+  NAME TYPE[,FLAGS] POOL_ID...
+
+  NAME      name of the workqueue
+  TYPE      percpu, unbound or ordered
+  FLAGS     S: strict affinity scope
+  POOL_ID   worker pool ID associated with each possible CPU
+"""
+
+import sys
+
+import argparse
+parser = argparse.ArgumentParser(description=desc,
+                                 formatter_class=argparse.RawTextHelpFormatter)
+args = parser.parse_args()
+
+import drgn
+from drgn.helpers.linux.list import list_for_each_entry,list_empty
+from drgn.helpers.linux.percpu import per_cpu_ptr
+from drgn.helpers.linux.cpumask import for_each_cpu,for_each_possible_cpu
+from drgn.helpers.linux.nodemask import for_each_node
+from drgn.helpers.linux.idr import idr_for_each
+
+def err(s):
+    print(s, file=sys.stderr, flush=True)
+    sys.exit(1)
+
+def cpumask_str(cpumask):
+    output = ""
+    base = 0
+    v = 0
+    for cpu in for_each_cpu(cpumask[0]):
+        while cpu - base >= 32:
+            output += f'{hex(v)} '
+            base += 32
+            v = 0
+        v |= 1 << (cpu - base)
+    if v > 0:
+        output += f'{v:08x}'
+    return output.strip()
+
+wq_type_len = 9
+
+def wq_type_str(wq):
+    if wq.flags & WQ_BH:
+        return f'{"bh":{wq_type_len}}'
+    elif wq.flags & WQ_UNBOUND:
+        if wq.flags & WQ_ORDERED:
+            return f'{"ordered":{wq_type_len}}'
+        else:
+            if wq.attrs.affn_strict:
+                return f'{"unbound,S":{wq_type_len}}'
+            else:
+                return f'{"unbound":{wq_type_len}}'
+    else:
+        return f'{"percpu":{wq_type_len}}'
+
+worker_pool_idr         = prog['worker_pool_idr']
+workqueues              = prog['workqueues']
+wq_unbound_cpumask      = prog['wq_unbound_cpumask']
+wq_pod_types            = prog['wq_pod_types']
+wq_affn_dfl             = prog['wq_affn_dfl']
+wq_affn_names           = prog['wq_affn_names']
+
+WQ_BH                   = prog['WQ_BH']
+WQ_UNBOUND              = prog['WQ_UNBOUND']
+WQ_ORDERED              = prog['__WQ_ORDERED']
+WQ_MEM_RECLAIM          = prog['WQ_MEM_RECLAIM']
+
+WQ_AFFN_CPU             = prog['WQ_AFFN_CPU']
+WQ_AFFN_SMT             = prog['WQ_AFFN_SMT']
+WQ_AFFN_CACHE           = prog['WQ_AFFN_CACHE']
+WQ_AFFN_CACHE_SHARD     = prog['WQ_AFFN_CACHE_SHARD']
+WQ_AFFN_NUMA            = prog['WQ_AFFN_NUMA']
+WQ_AFFN_SYSTEM          = prog['WQ_AFFN_SYSTEM']
+
+POOL_BH                 = prog['POOL_BH']
+
+WQ_NAME_LEN             = prog['WQ_NAME_LEN'].value_()
+cpumask_str_len         = len(cpumask_str(wq_unbound_cpumask))
+
+print('Affinity Scopes')
+print('===============')
+
+print(f'wq_unbound_cpumask={cpumask_str(wq_unbound_cpumask)}')
+
+def print_pod_type(pt):
+    print(f'  nr_pods  {pt.nr_pods.value_()}')
+
+    print('  pod_cpus', end='')
+    for pod in range(pt.nr_pods):
+        print(f' [{pod}]={cpumask_str(pt.pod_cpus[pod])}', end='')
+    print('')
+
+    print('  pod_node', end='')
+    for pod in range(pt.nr_pods):
+        print(f' [{pod}]={pt.pod_node[pod].value_()}', end='')
+    print('')
+
+    print(f'  cpu_pod ', end='')
+    for cpu in for_each_possible_cpu(prog):
+        print(f' [{cpu}]={pt.cpu_pod[cpu].value_()}', end='')
+    print('')
+
+for affn in [WQ_AFFN_CPU, WQ_AFFN_SMT, WQ_AFFN_CACHE, WQ_AFFN_CACHE_SHARD, WQ_AFFN_NUMA, WQ_AFFN_SYSTEM]:
+    print('')
+    print(f'{wq_affn_names[affn].string_().decode().upper()}{" (default)" if affn == wq_affn_dfl else ""}')
+    print_pod_type(wq_pod_types[affn])
+
+print('')
+print('Worker Pools')
+print('============')
+
+max_pool_id_len = 0
+max_ref_len = 0
+for pi, pool in idr_for_each(worker_pool_idr):
+    pool = drgn.Object(prog, 'struct worker_pool', address=pool)
+    max_pool_id_len = max(max_pool_id_len, len(f'{pi}'))
+    max_ref_len = max(max_ref_len, len(f'{pool.refcnt.value_()}'))
+
+for pi, pool in idr_for_each(worker_pool_idr):
+    pool = drgn.Object(prog, 'struct worker_pool', address=pool)
+    print(f'pool[{pi:0{max_pool_id_len}}] flags=0x{pool.flags.value_():02x} ref={pool.refcnt.value_():{max_ref_len}} nice={pool.attrs.nice.value_():3} ', end='')
+    print(f'idle/workers={pool.nr_idle.value_():3}/{pool.nr_workers.value_():3} ', end='')
+    if pool.cpu >= 0:
+        print(f'cpu={pool.cpu.value_():3}', end='')
+        if pool.flags & POOL_BH:
+            print(' bh', end='')
+    else:
+        print(f'cpus={cpumask_str(pool.attrs.cpumask)}', end='')
+        print(f' pod_cpus={cpumask_str(pool.attrs.__pod_cpumask)}', end='')
+        if pool.attrs.affn_strict:
+            print(' strict', end='')
+    print('')
+
+print('')
+print('Workqueue CPU -> pool')
+print('=====================')
+
+print(f'[{"workqueue":^{WQ_NAME_LEN-2}}\\ {"type   CPU":{wq_type_len}}', end='')
+for cpu in for_each_possible_cpu(prog):
+    print(f' {cpu:{max_pool_id_len}}', end='')
+print(' dfl]')
+
+for wq in list_for_each_entry('struct workqueue_struct', workqueues.address_of_(), 'list'):
+    print(f'{wq.name.string_().decode():{WQ_NAME_LEN}} {wq_type_str(wq):10}', end='')
+
+    for cpu in for_each_possible_cpu(prog):
+        pool_id = per_cpu_ptr(wq.cpu_pwq, cpu)[0].pool.id.value_()
+        field_len = max(len(str(cpu)), max_pool_id_len)
+        print(f' {pool_id:{field_len}}', end='')
+
+    if wq.flags & WQ_UNBOUND:
+        print(f' {wq.dfl_pwq.pool.id.value_():{max_pool_id_len}}', end='')
+    print('')
+
+print('')
+print('Workqueue -> rescuer')
+print('====================')
+
+ucpus_len = max(cpumask_str_len, len("unbound_cpus"))
+rcpus_len = max(cpumask_str_len, len("rescuer_cpus"))
+
+print(f'[{"workqueue":^{WQ_NAME_LEN-2}}\\ {"unbound_cpus":{ucpus_len}}    pid {"rescuer_cpus":{rcpus_len}} ]')
+
+for wq in list_for_each_entry('struct workqueue_struct', workqueues.address_of_(), 'list'):
+    if not (wq.flags & WQ_MEM_RECLAIM):
+        continue
+
+    print(f'{wq.name.string_().decode():{WQ_NAME_LEN}}', end='')
+    if wq.flags & WQ_UNBOUND:
+        print(f' {cpumask_str(wq.attrs.cpumask):{ucpus_len}}', end='')
+    else:
+        print(f' {"":{ucpus_len}}', end='')
+
+    print(f' {wq.rescuer.task.pid.value_():6}', end='')
+    print(f' {cpumask_str(wq.rescuer.task.cpus_ptr):{rcpus_len}}', end='')
+    print('')
+
+print('')
+print('Unbound workqueue -> node_nr/max_active')
+print('=======================================')
+
+if 'node_to_cpumask_map' in prog:
+    __cpu_online_mask = prog['__cpu_online_mask']
+    node_to_cpumask_map = prog['node_to_cpumask_map']
+    nr_node_ids = prog['nr_node_ids'].value_()
+
+    print(f'online_cpus={cpumask_str(__cpu_online_mask.address_of_())}')
+    for node in for_each_node():
+        print(f'NODE[{node:02}]={cpumask_str(node_to_cpumask_map[node])}')
+    print('')
+
+    print(f'[{"workqueue":^{WQ_NAME_LEN-1}} {"min":>4} {"max":>4}', end='')
+    for node in for_each_node():
+        print(f' {"NODE " + str(node):>9}', end='')
+    print(f' {"dfl":>9} ]')
+    print('')
+
+    for wq in list_for_each_entry('struct workqueue_struct', workqueues.address_of_(), 'list'):
+        if not (wq.flags & WQ_UNBOUND):
+            continue
+
+        print(f'{wq.name.string_().decode():{WQ_NAME_LEN}} ', end='')
+        print(f'{wq.min_active.value_():4} {wq.max_active.value_():4}', end='')
+        for node in for_each_node():
+            nna = wq.node_nr_active[node]
+            print(f' {f"{nna.nr.counter.value_()}/{nna.max.value_()}":>9}', end='')
+        nna = wq.node_nr_active[nr_node_ids]
+        print(f' {f"{nna.nr.counter.value_()}/{nna.max.value_()}":>9}')
+else:
+    printf(f'node_to_cpumask_map not present, is NUMA enabled?')
diff --git a/tools/workqueue/wq_monitor.py b/tools/workqueue/wq_monitor.py
new file mode 100644
index 000000000..7f47fa398
--- /dev/null
+++ b/tools/workqueue/wq_monitor.py
@@ -0,0 +1,168 @@
+#!/usr/bin/env drgn
+#
+# Copyright (C) 2023 Tejun Heo <tj@kernel.org>
+# Copyright (C) 2023 Meta Platforms, Inc. and affiliates.
+
+desc = """
+This is a drgn script to monitor workqueues. For more info on drgn, visit
+https://github.com/osandov/drgn.
+
+  total    Total number of work items executed by the workqueue.
+
+  infl     The number of currently in-flight work items.
+
+  CPUtime  Total CPU time consumed by the workqueue in seconds. This is
+           sampled from scheduler ticks and only provides ballpark
+           measurement. "nohz_full=" CPUs are excluded from measurement.
+
+  CPUitsv  The number of times a concurrency-managed work item hogged CPU
+           longer than the threshold (workqueue.cpu_intensive_thresh_us)
+           and got excluded from concurrency management to avoid stalling
+           other work items.
+
+  CMW/RPR  For per-cpu workqueues, the number of concurrency-management
+           wake-ups while executing a work item of the workqueue. For
+           unbound workqueues, the number of times a worker was repatriated
+           to its affinity scope after being migrated to an off-scope CPU by
+           the scheduler.
+
+  mayday   The number of times the rescuer was requested while waiting for
+           new worker creation.
+
+  rescued  The number of work items executed by the rescuer.
+"""
+
+import signal
+import re
+import time
+import json
+
+import argparse
+parser = argparse.ArgumentParser(description=desc,
+                                 formatter_class=argparse.RawTextHelpFormatter)
+parser.add_argument('workqueue', metavar='REGEX', nargs='*',
+                    help='Target workqueue name patterns (all if empty)')
+parser.add_argument('-i', '--interval', metavar='SECS', type=float, default=1,
+                    help='Monitoring interval (0 to print once and exit)')
+parser.add_argument('-j', '--json', action='store_true',
+                    help='Output in json')
+args = parser.parse_args()
+
+import drgn
+from drgn.helpers.linux.list import list_for_each_entry
+
+workqueues              = prog['workqueues']
+
+WQ_UNBOUND              = prog['WQ_UNBOUND']
+WQ_MEM_RECLAIM          = prog['WQ_MEM_RECLAIM']
+
+PWQ_STAT_STARTED        = prog['PWQ_STAT_STARTED']      # work items started execution
+PWQ_STAT_COMPLETED      = prog['PWQ_STAT_COMPLETED']	# work items completed execution
+PWQ_STAT_CPU_TIME       = prog['PWQ_STAT_CPU_TIME']     # total CPU time consumed
+PWQ_STAT_CPU_INTENSIVE  = prog['PWQ_STAT_CPU_INTENSIVE'] # wq_cpu_intensive_thresh_us violations
+PWQ_STAT_CM_WAKEUP      = prog['PWQ_STAT_CM_WAKEUP']    # concurrency-management worker wakeups
+PWQ_STAT_REPATRIATED    = prog['PWQ_STAT_REPATRIATED']  # unbound workers brought back into scope
+PWQ_STAT_MAYDAY         = prog['PWQ_STAT_MAYDAY']	# maydays to rescuer
+PWQ_STAT_RESCUED        = prog['PWQ_STAT_RESCUED']	# linked work items executed by rescuer
+PWQ_NR_STATS            = prog['PWQ_NR_STATS']
+
+class WqStats:
+    def __init__(self, wq):
+        self.name = wq.name.string_().decode()
+        self.unbound = wq.flags & WQ_UNBOUND != 0
+        self.mem_reclaim = wq.flags & WQ_MEM_RECLAIM != 0
+        self.stats = [0] * PWQ_NR_STATS
+        for pwq in list_for_each_entry('struct pool_workqueue', wq.pwqs.address_of_(), 'pwqs_node'):
+            for i in range(PWQ_NR_STATS):
+                self.stats[i] += int(pwq.stats[i])
+
+    def dict(self, now):
+        return { 'timestamp'            : now,
+                 'name'                 : self.name,
+                 'unbound'              : self.unbound,
+                 'mem_reclaim'          : self.mem_reclaim,
+                 'started'              : self.stats[PWQ_STAT_STARTED],
+                 'completed'            : self.stats[PWQ_STAT_COMPLETED],
+                 'cpu_time'             : self.stats[PWQ_STAT_CPU_TIME],
+                 'cpu_intensive'        : self.stats[PWQ_STAT_CPU_INTENSIVE],
+                 'cm_wakeup'            : self.stats[PWQ_STAT_CM_WAKEUP],
+                 'repatriated'          : self.stats[PWQ_STAT_REPATRIATED],
+                 'mayday'               : self.stats[PWQ_STAT_MAYDAY],
+                 'rescued'              : self.stats[PWQ_STAT_RESCUED], }
+
+    def table_header_str():
+        return f'{"":>24} {"total":>8} {"infl":>5} {"CPUtime":>8} '\
+            f'{"CPUitsv":>7} {"CMW/RPR":>7} {"mayday":>7} {"rescued":>7}'
+
+    def table_row_str(self):
+        cpu_intensive = '-'
+        cmw_rpr = '-'
+        mayday = '-'
+        rescued = '-'
+
+        if self.unbound:
+            cmw_rpr = str(self.stats[PWQ_STAT_REPATRIATED]);
+        else:
+            cpu_intensive = str(self.stats[PWQ_STAT_CPU_INTENSIVE])
+            cmw_rpr = str(self.stats[PWQ_STAT_CM_WAKEUP])
+
+        if self.mem_reclaim:
+            mayday = str(self.stats[PWQ_STAT_MAYDAY])
+            rescued = str(self.stats[PWQ_STAT_RESCUED])
+
+        out = f'{self.name[-24:]:24} ' \
+              f'{self.stats[PWQ_STAT_STARTED]:8} ' \
+              f'{max(self.stats[PWQ_STAT_STARTED] - self.stats[PWQ_STAT_COMPLETED], 0):5} ' \
+              f'{self.stats[PWQ_STAT_CPU_TIME] / 1000000:8.1f} ' \
+              f'{cpu_intensive:>7} ' \
+              f'{cmw_rpr:>7} ' \
+              f'{mayday:>7} ' \
+              f'{rescued:>7} '
+        return out.rstrip(':')
+
+exit_req = False
+
+def sigint_handler(signr, frame):
+    global exit_req
+    exit_req = True
+
+def main():
+    # handle args
+    table_fmt = not args.json
+    interval = args.interval
+
+    re_str = None
+    if args.workqueue:
+        for r in args.workqueue:
+            if re_str is None:
+                re_str = r
+            else:
+                re_str += '|' + r
+
+    filter_re = re.compile(re_str) if re_str else None
+
+    # monitoring loop
+    signal.signal(signal.SIGINT, sigint_handler)
+
+    while not exit_req:
+        now = time.time()
+
+        if table_fmt:
+            print()
+            print(WqStats.table_header_str())
+
+        for wq in list_for_each_entry('struct workqueue_struct', workqueues.address_of_(), 'list'):
+            stats = WqStats(wq)
+            if filter_re and not filter_re.search(stats.name):
+                continue
+            if table_fmt:
+                print(stats.table_row_str())
+            else:
+                print(stats.dict(now))
+
+        if interval == 0:
+            break
+        time.sleep(interval)
+
+if __name__ == "__main__":
+    main()