arch/s390/pci/pci_clp.c

File Facts

System

Linux kernel

Corpus path

arch/s390/pci/pci_clp.c

Extension

.c

Size

16003 bytes

Lines

679

Domain

Architecture Layer

Bucket

arch/s390

Inferred role

Architecture Layer: operation-table or driver-model contract

Status

pattern implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/miscdevice.h
• linux/slab.h
• linux/err.h
• linux/delay.h
• linux/pci.h
• linux/uaccess.h
• asm/asm-extable.h
• asm/pci_debug.h
• asm/pci_clp.h
• asm/asm.h
• asm/clp.h
• uapi/asm/clp.h
• pci_bus.h

Detected Declarations

• function update_uid_checking
• function zpci_err_clp
• function clp_get_ilp
• function clp_req
• function clp_free_block
• function clp_store_query_pci_fngrp
• function clp_query_pci_fngrp
• function clp_store_query_pci_fn
• function clp_query_pci_fn
• function clp_set_pci_fn
• function clp_setup_writeback_mio
• function clp_enable_fh
• function clp_disable_fh
• function clp_list_pci_req
• function clp_list_pci
• function clp_find_pci
• function __clp_add
• function clp_scan_pci_devices
• function clp_refresh_fh
• function clp_get_state
• function clp_base_slpc
• function clp_base_command
• function clp_pci_slpc
• function clp_pci_list
• function clp_pci_query
• function clp_pci_query_grp
• function clp_pci_command
• function clp_normal_command
• function clp_immediate_command
• function clp_misc_ioctl
• function clp_misc_release

Annotated Snippet

static const struct file_operations clp_misc_fops = {
	.owner = THIS_MODULE,
	.open = nonseekable_open,
	.release = clp_misc_release,
	.unlocked_ioctl = clp_misc_ioctl,
};

static struct miscdevice clp_misc_device = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "clp",
	.fops = &clp_misc_fops,
};

builtin_misc_device(clp_misc_device);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/miscdevice.h`, `linux/slab.h`, `linux/err.h`, `linux/delay.h`, `linux/pci.h`, `linux/uaccess.h`, `asm/asm-extable.h`.
• Detected declarations: `function update_uid_checking`, `function zpci_err_clp`, `function clp_get_ilp`, `function clp_req`, `function clp_free_block`, `function clp_store_query_pci_fngrp`, `function clp_query_pci_fngrp`, `function clp_store_query_pci_fn`, `function clp_query_pci_fn`, `function clp_set_pci_fn`.
• Atlas domain: Architecture Layer / arch/s390.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.