ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

20 files changed, 360 insertions, 0 deletions

diff --git a/Documentation/gpu/xe/index.rst b/Documentation/gpu/xe/index.rst
new file mode 100644
index 000000000..665c0e936
--- /dev/null
+++ b/Documentation/gpu/xe/index.rst
@@ -0,0 +1,37 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+.. _drm/xe:
+
+=======================
+drm/xe Intel GFX Driver
+=======================
+
+The drm/xe driver supports some future GFX cards with rendering, display,
+compute and media. Support for currently available platforms like TGL, ADL,
+DG2, etc is provided to prototype the driver.
+
+The display, or :ref:`drm-kms`, support for drm/xe is provided by
+:ref:`drm/intel-display`, and shared with :ref:`drm/i915 <drm/i915>`.
+
+.. toctree::
+   :titlesonly:
+
+   xe_mm
+   xe_map
+   xe_migrate
+   xe_exec_queue
+   xe_cs
+   xe_pm
+   xe_gt_freq
+   xe_pcode
+   xe_gt_mcr
+   xe_wa
+   xe_rtp
+   xe_firmware
+   xe_tile
+   xe_debugging
+   xe_devcoredump
+   xe_device
+   xe-drm-usage-stats.rst
+   xe_configfs
+   xe_gt_stats
diff --git a/Documentation/gpu/xe/xe-drm-usage-stats.rst b/Documentation/gpu/xe/xe-drm-usage-stats.rst
new file mode 100644
index 000000000..482d503ae
--- /dev/null
+++ b/Documentation/gpu/xe/xe-drm-usage-stats.rst
@@ -0,0 +1,10 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. _xe-usage-stats:
+
+========================================
+Xe DRM client usage stats implementation
+========================================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_drm_client.c
+   :doc: DRM Client usage stats
diff --git a/Documentation/gpu/xe/xe_configfs.rst b/Documentation/gpu/xe/xe_configfs.rst
new file mode 100644
index 000000000..7f8ec39dc
--- /dev/null
+++ b/Documentation/gpu/xe/xe_configfs.rst
@@ -0,0 +1,16 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. _xe_configfs:
+
+===========
+Xe Configfs
+===========
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_configfs.c
+   :doc: Xe Configfs
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_configfs.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_cs.rst b/Documentation/gpu/xe/xe_cs.rst
new file mode 100644
index 000000000..e379aed4f
--- /dev/null
+++ b/Documentation/gpu/xe/xe_cs.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==================
+Command submission
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec.c
+   :doc: Execbuf (User GPU command submission)
diff --git a/Documentation/gpu/xe/xe_debugging.rst b/Documentation/gpu/xe/xe_debugging.rst
new file mode 100644
index 000000000..d65e56ff3
--- /dev/null
+++ b/Documentation/gpu/xe/xe_debugging.rst
@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=========
+Debugging
+=========
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_assert.h
diff --git a/Documentation/gpu/xe/xe_devcoredump.rst b/Documentation/gpu/xe/xe_devcoredump.rst
new file mode 100644
index 000000000..ae4ec0e34
--- /dev/null
+++ b/Documentation/gpu/xe/xe_devcoredump.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==================
+Xe Device Coredump
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_devcoredump.c
+   :doc: Xe device coredump
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_devcoredump.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_device.rst b/Documentation/gpu/xe/xe_device.rst
new file mode 100644
index 000000000..d3a022362
--- /dev/null
+++ b/Documentation/gpu/xe/xe_device.rst
@@ -0,0 +1,17 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+.. _xe-device-wedging:
+
+==================
+Xe Device Wedging
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_device.c
+   :doc: Xe Device Wedging
+
+====================
+GPU Health Indicator
+====================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ras.c
+   :doc: GPU Health Indicator
diff --git a/Documentation/gpu/xe/xe_exec_queue.rst b/Documentation/gpu/xe/xe_exec_queue.rst
new file mode 100644
index 000000000..870780621
--- /dev/null
+++ b/Documentation/gpu/xe/xe_exec_queue.rst
@@ -0,0 +1,34 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+===============
+Execution Queue
+===============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.c
+   :doc: Execution Queue
+
+Multi Queue Group
+=================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.c
+   :doc: Multi Queue Group
+
+.. _multi-queue-group-guc-interface:
+
+Multi Queue Group GuC interface
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_submit.c
+   :doc: Multi Queue Group GuC interface
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue_types.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_firmware.rst b/Documentation/gpu/xe/xe_firmware.rst
new file mode 100644
index 000000000..d3030d1c9
--- /dev/null
+++ b/Documentation/gpu/xe/xe_firmware.rst
@@ -0,0 +1,46 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+========
+Firmware
+========
+
+Firmware Layout
+===============
+
+.. kernel-doc:: drivers/gpu/drm/xe/abi/uc_fw_abi.h
+   :doc: CSS-based Firmware Layout
+
+.. kernel-doc:: drivers/gpu/drm/xe/abi/uc_fw_abi.h
+   :doc: GSC-based Firmware Layout
+
+Write Once Protected Content Memory (WOPCM) Layout
+==================================================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_wopcm.c
+   :doc: Write Once Protected Content Memory (WOPCM) Layout
+
+GuC CTB Blob
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_ct.c
+   :doc: GuC CTB Blob
+
+GuC Power Conservation (PC)
+===========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_pc.c
+   :doc: GuC Power Conservation (PC)
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_rc.c
+   :doc: GuC Render C-states (GuC RC)
+
+PCIe Gen5 Limitations
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_device_sysfs.c
+   :doc: PCIe Gen5 Limitations
+
+Internal API
+============
+
+TODO
diff --git a/Documentation/gpu/xe/xe_gt_freq.rst b/Documentation/gpu/xe/xe_gt_freq.rst
new file mode 100644
index 000000000..182d6aabe
--- /dev/null
+++ b/Documentation/gpu/xe/xe_gt_freq.rst
@@ -0,0 +1,17 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==========================
+Xe GT Frequency Management
+==========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_freq.c
+   :doc: Xe GT Frequency Management
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_throttle.c
+   :doc: Xe GT Throttle
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_freq.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_gt_mcr.rst b/Documentation/gpu/xe/xe_gt_mcr.rst
new file mode 100644
index 000000000..848c07bc3
--- /dev/null
+++ b/Documentation/gpu/xe/xe_gt_mcr.rst
@@ -0,0 +1,13 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==============================================
+GT Multicast/Replicated (MCR) Register Support
+==============================================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_mcr.c
+   :doc: GT Multicast/Replicated (MCR) Register Support
+
+Internal API
+============
+
+TODO
diff --git a/Documentation/gpu/xe/xe_gt_stats.rst b/Documentation/gpu/xe/xe_gt_stats.rst
new file mode 100644
index 000000000..5ff806aba
--- /dev/null
+++ b/Documentation/gpu/xe/xe_gt_stats.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+================
+Xe GT Statistics
+================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_stats.c
+   :doc: Xe GT Statistics
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_stats_types.h
+   :internal:
diff --git a/Documentation/gpu/xe/xe_map.rst b/Documentation/gpu/xe/xe_map.rst
new file mode 100644
index 000000000..a098cfd2d
--- /dev/null
+++ b/Documentation/gpu/xe/xe_map.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=========
+Map Layer
+=========
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_map.h
+   :doc: Map layer
diff --git a/Documentation/gpu/xe/xe_migrate.rst b/Documentation/gpu/xe/xe_migrate.rst
new file mode 100644
index 000000000..f92faec0a
--- /dev/null
+++ b/Documentation/gpu/xe/xe_migrate.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=============
+Migrate Layer
+=============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_migrate_doc.h
+   :doc: Migrate Layer
diff --git a/Documentation/gpu/xe/xe_mm.rst b/Documentation/gpu/xe/xe_mm.rst
new file mode 100644
index 000000000..95864a450
--- /dev/null
+++ b/Documentation/gpu/xe/xe_mm.rst
@@ -0,0 +1,29 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=================
+Memory Management
+=================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_bo_doc.h
+   :doc: Buffer Objects (BO)
+
+GGTT
+====
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ggtt.c
+   :doc: Global Graphics Translation Table (GGTT)
+
+GGTT Internal API
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ggtt_types.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ggtt.c
+   :internal:
+
+Pagetable building
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pt.c
+   :doc: Pagetable building
diff --git a/Documentation/gpu/xe/xe_pcode.rst b/Documentation/gpu/xe/xe_pcode.rst
new file mode 100644
index 000000000..2a4360112
--- /dev/null
+++ b/Documentation/gpu/xe/xe_pcode.rst
@@ -0,0 +1,23 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=====
+Pcode
+=====
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pcode.c
+   :doc: PCODE
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pcode.c
+   :internal:
+
+.. _xe-survivability-mode:
+
+==================
+Survivability Mode
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_survivability_mode.c
+   :doc: Survivability Mode
diff --git a/Documentation/gpu/xe/xe_pm.rst b/Documentation/gpu/xe/xe_pm.rst
new file mode 100644
index 000000000..6781cdfb2
--- /dev/null
+++ b/Documentation/gpu/xe/xe_pm.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+========================
+Runtime Power Management
+========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pm.c
+   :doc: Xe Power Management
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pm.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_rtp.rst b/Documentation/gpu/xe/xe_rtp.rst
new file mode 100644
index 000000000..7fdf4b6c1
--- /dev/null
+++ b/Documentation/gpu/xe/xe_rtp.rst
@@ -0,0 +1,20 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=========================
+Register Table Processing
+=========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp.c
+   :doc: Register Table Processing
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp_types.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_tile.rst b/Documentation/gpu/xe/xe_tile.rst
new file mode 100644
index 000000000..c33f68dd9
--- /dev/null
+++ b/Documentation/gpu/xe/xe_tile.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==================
+Multi-tile Devices
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_tile.c
+   :doc: Multi-tile Design
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_tile.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_wa.rst b/Documentation/gpu/xe/xe_wa.rst
new file mode 100644
index 000000000..f8811cc6a
--- /dev/null
+++ b/Documentation/gpu/xe/xe_wa.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+====================
+Hardware workarounds
+====================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_wa.c
+   :doc: Hardware workarounds
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_wa.c
+   :internal: