drivers/hwtracing/coresight/coresight-etm3x-core.c

File Facts

System

Linux kernel

Corpus path

drivers/hwtracing/coresight/coresight-etm3x-core.c

Extension

.c

Size

26025 bytes

Lines

1032

Domain

Driver Families

Bucket

drivers/hwtracing

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/moduleparam.h
• linux/init.h
• linux/types.h
• linux/device.h
• linux/io.h
• linux/err.h
• linux/fs.h
• linux/slab.h
• linux/delay.h
• linux/smp.h
• linux/sysfs.h
• linux/stat.h
• linux/pm_runtime.h
• linux/cpu.h
• linux/of.h
• linux/coresight.h
• linux/coresight-pmu.h
• linux/amba/bus.h
• linux/seq_file.h
• linux/uaccess.h
• linux/clk.h
• linux/perf_event.h
• linux/perf/arm_pmu.h
• asm/sections.h
• coresight-etm.h
• coresight-etm-perf.h
• coresight-trace-id.h

Detected Declarations

• struct etm_enable_arg
• function etm_os_unlock
• function etm_set_pwrdwn
• function etm_clr_pwrdwn
• function etm_set_pwrup
• function etm_clr_pwrup
• function coresight_timeout_etm
• function etm_set_prog
• function etm_clr_prog
• function etm_set_default
• function etm_config_trace_mode
• function etm_parse_event_config
• function etm_enable_hw
• function etm_enable_sysfs_smp_call
• function etm_cpu_id
• function etm_release_trace_id
• function etm_enable_perf
• function etm_enable_sysfs
• function etm_enable
• function etm_disable_hw
• function etm_disable_sysfs_smp_call
• function etm_disable_perf
• function _free_aux
• function etm_disable
• function etm_online_cpu
• function etm_starting_cpu
• function etm_dying_cpu
• function etm_arch_supported
• function etm_init_arch_data
• function etm_hp_setup
• function etm_hp_clear
• function etm_probe
• function clear_etmdrvdata
• function etm_remove
• function etm_runtime_suspend
• function etm_runtime_resume
• function etm_init
• function etm_exit
• module init etm_init

Annotated Snippet

module_init(etm_init);
module_exit(etm_exit);

MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/moduleparam.h`, `linux/init.h`, `linux/types.h`, `linux/device.h`, `linux/io.h`, `linux/err.h`, `linux/fs.h`.
• Detected declarations: `struct etm_enable_arg`, `function etm_os_unlock`, `function etm_set_pwrdwn`, `function etm_clr_pwrdwn`, `function etm_set_pwrup`, `function etm_clr_pwrup`, `function coresight_timeout_etm`, `function etm_set_prog`, `function etm_clr_prog`, `function etm_set_default`.
• Atlas domain: Driver Families / drivers/hwtracing.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.