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3c0da1030c
Add support for the REF_TRACKER infrastructure to the DPLL subsystem. When enabled, this allows developers to track and debug reference counting leaks or imbalances for dpll_device and dpll_pin objects. It records stack traces for every get/put operation and exposes this information via debugfs at: /sys/kernel/debug/ref_tracker/dpll_device_* /sys/kernel/debug/ref_tracker/dpll_pin_* The following API changes are made to support this: 1. dpll_device_get() / dpll_device_put() now accept a 'dpll_tracker *' (which is a typedef to 'struct ref_tracker *' when enabled, or an empty struct otherwise). 2. dpll_pin_get() / dpll_pin_put() and fwnode_dpll_pin_find() similarly accept the tracker argument. 3. Internal registration structures now hold a tracker to associate the reference held by the registration with the specific owner. All existing in-tree drivers (ice, mlx5, ptp_ocp, zl3073x) are updated to pass NULL for the new tracker argument, maintaining current behavior while enabling future debugging capabilities. Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com> Co-developed-by: Petr Oros <poros@redhat.com> Signed-off-by: Petr Oros <poros@redhat.com> Signed-off-by: Ivan Vecera <ivecera@redhat.com> Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com> Link: https://patch.msgid.link/20260203174002.705176-8-ivecera@redhat.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
28 lines
679 B
Text
28 lines
679 B
Text
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Generic DPLL drivers configuration
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#
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menu "DPLL device support"
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config DPLL
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bool
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config DPLL_REFCNT_TRACKER
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bool "DPLL reference count tracking"
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depends on DEBUG_KERNEL && STACKTRACE_SUPPORT && DPLL
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select REF_TRACKER
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help
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Enable reference count tracking for DPLL devices and pins.
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This helps debugging reference leaks and use-after-free bugs
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by recording stack traces for each get/put operation.
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The tracking information is exposed via debugfs at:
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/sys/kernel/debug/ref_tracker/dpll_device_*
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/sys/kernel/debug/ref_tracker/dpll_pin_*
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If unsure, say N.
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source "drivers/dpll/zl3073x/Kconfig"
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endmenu
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