drivers/hwtracing/coresight/coresight-etm4x-core.c

File Facts

System

Linux kernel

Corpus path

drivers/hwtracing/coresight/coresight-etm4x-core.c

Extension

.c

Size

75190 bytes

Lines

2642

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/acpi.h
• linux/bitfield.h
• linux/bitops.h
• linux/kernel.h
• linux/kvm_host.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/clk.h
• linux/cpu.h
• linux/cpu_pm.h
• linux/coresight.h
• linux/coresight-pmu.h
• linux/amba/bus.h
• linux/seq_file.h
• linux/uaccess.h
• linux/perf_event.h
• linux/perf/arm_pmu.h
• linux/platform_device.h
• linux/pm_runtime.h
• linux/property.h
• linux/clk/clk-conf.h
• asm/barrier.h

Detected Declarations

• struct etm4_init_arg
• struct etm4_enable_arg
• struct etm4_arch_features
• function TRCSSPCICRn
• function etm4x_sysreg_read
• function etm4x_sysreg_write
• function ete_sysreg_read
• function ete_sysreg_write
• function etm_detect_os_lock
• function etm_write_os_lock
• function etm4_os_unlock_csa
• function etm4_os_unlock
• function etm4_os_lock
• function etm4_cs_lock
• function etm4_cs_unlock
• function etm4_cpu_id
• function etm4_release_trace_id
• function etm4x_prohibit_trace
• function etm4x_get_kern_user_filter
• function packet
• function etm4_hisi_match_pid
• function etm4_hisi_config_core_commit
• function etm4_enable_arch_specific
• function for_each_set_bit
• function etm4_disable_arch_specific
• function for_each_set_bit
• function etm4_check_arch_features
• function etm4_enable_arch_specific
• function etm4x_wait_status
• function etm4_enable_trace_unit
• function etm4_enable_hw
• function etm4_enable_sysfs_smp_call
• function etm4_config_timestamp_event
• function etm4_parse_event_config
• function etm4_enable_perf
• function etm4_enable_sysfs
• function etm4_enable
• function etm4_disable_trace_unit
• function etm4_disable_hw
• function etm4_disable_sysfs_smp_call
• function etm4_disable_perf
• function etm4_disable_sysfs
• function etm4_disable
• function etm4_resume_perf
• function etm4_pause_perf
• function cpu_supports_sysreg_trace
• function etm4_init_sysreg_access
• function is_devtype_cpu_trace

Annotated Snippet

module_init(etm4x_init);
module_exit(etm4x_exit);

MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace v4.x driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/acpi.h`, `linux/bitfield.h`, `linux/bitops.h`, `linux/kernel.h`, `linux/kvm_host.h`, `linux/moduleparam.h`, `linux/init.h`, `linux/types.h`.
• Detected declarations: `struct etm4_init_arg`, `struct etm4_enable_arg`, `struct etm4_arch_features`, `function TRCSSPCICRn`, `function etm4x_sysreg_read`, `function etm4x_sysreg_write`, `function ete_sysreg_read`, `function ete_sysreg_write`, `function etm_detect_os_lock`, `function etm_write_os_lock`.
• 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.