arch/s390/pci/pci_fixup.c

File Facts

System

Linux kernel

Corpus path

arch/s390/pci/pci_fixup.c

Extension

.c

Size

563 bytes

Lines

24

Domain

Architecture Layer

Bucket

arch/s390

Inferred role

Architecture Layer: implementation source

Status

source 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 or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/pci.h

Detected Declarations

• function Author

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Exceptions for specific devices,
 *
 * Copyright IBM Corp. 2025
 *
 * Author(s):
 *   Niklas Schnelle <schnelle@linux.ibm.com>
 */
#include <linux/pci.h>

static void zpci_ism_bar_no_mmap(struct pci_dev *pdev)
{
	/*
	 * ISM's BAR is special. Drivers written for ISM know
	 * how to handle this but others need to be aware of their
	 * special nature e.g. to prevent attempts to mmap() it.
	 */
	pdev->non_mappable_bars = 1;
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_IBM,
			PCI_DEVICE_ID_IBM_ISM,
			zpci_ism_bar_no_mmap);

Annotation

• Immediate include surface: `linux/pci.h`.
• Detected declarations: `function Author`.
• Atlas domain: Architecture Layer / arch/s390.
• Implementation status: source implementation candidate.

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.