drivers/s390/cio/chp.c

File Facts

System

Linux kernel

Corpus path

drivers/s390/cio/chp.c

Extension

.c

Size

21138 bytes

Lines

885

Domain

Driver Families

Bucket

drivers/s390

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/bug.h
• linux/workqueue.h
• linux/spinlock.h
• linux/export.h
• linux/sched.h
• linux/init.h
• linux/jiffies.h
• linux/wait.h
• linux/mutex.h
• linux/errno.h
• linux/slab.h
• asm/chpid.h
• asm/sclp.h
• asm/crw.h
• cio.h
• css.h
• ioasm.h
• cio_debug.h
• chp.h

Detected Declarations

• enum cfg_task_t
• function set_chp_logically_online
• function chp_get_status
• function mask
• function chp_is_registered
• function s390_vary_chpid
• function measurement_chars_read
• function measurement_chars_full_read
• function chp_measurement_copy_block
• function measurement_read
• function ext_measurement_read
• function chp_remove_cmg_attr
• function chp_add_cmg_attr
• function chp_status_show
• function chp_status_write
• function chp_configure_show
• function chp_configure_write
• function chp_type_show
• function chp_cmg_show
• function chp_shared_show
• function chp_chid_show
• function chp_chid_external_show
• function chp_esc_show
• function apply_max_suffix
• function speed_bps_show
• function util_string_read
• function chp_release
• function chp_update_desc
• function chp_new
• function chp_process_crw
• function chp_ssd_get_mask
• function info_bit_num
• function info_expire
• function info_update
• function chp_info_get_status
• function cfg_get_task
• function cfg_set_task
• function chp_cfg_fetch_task
• function chp_id_for_each
• function cfg_func
• function chp_cfg_schedule
• function chp_cfg_cancel_deconfigure
• function cfg_idle
• function cfg_wait_idle
• function chp_init
• module init chp_init
• export chp_get_sch_opm
• export chp_ssd_get_mask

Annotated Snippet

subsys_initcall(chp_init);

Annotation

• Immediate include surface: `linux/bug.h`, `linux/workqueue.h`, `linux/spinlock.h`, `linux/export.h`, `linux/sched.h`, `linux/init.h`, `linux/jiffies.h`, `linux/wait.h`.
• Detected declarations: `enum cfg_task_t`, `function set_chp_logically_online`, `function chp_get_status`, `function mask`, `function chp_is_registered`, `function s390_vary_chpid`, `function measurement_chars_read`, `function measurement_chars_full_read`, `function chp_measurement_copy_block`, `function measurement_read`.
• Atlas domain: Driver Families / drivers/s390.
• 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.