drivers/xen/privcmd-buf.c

File Facts

System

Linux kernel

Corpus path

drivers/xen/privcmd-buf.c

Extension

.c

Size

4169 bytes

Lines

193

Domain

Driver Families

Bucket

drivers/xen

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• 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/module.h
• linux/list.h
• linux/miscdevice.h
• linux/mm.h
• linux/slab.h
• privcmd.h

Detected Declarations

• struct privcmd_buf_private
• struct privcmd_buf_vma_private
• function privcmd_buf_open
• function privcmd_buf_vmapriv_free
• function privcmd_buf_release
• function privcmd_buf_vma_open
• function privcmd_buf_vma_close
• function privcmd_buf_vma_fault
• function privcmd_buf_mmap
• export xen_privcmdbuf_fops

Annotated Snippet

const struct file_operations xen_privcmdbuf_fops = {
	.owner = THIS_MODULE,
	.open = privcmd_buf_open,
	.release = privcmd_buf_release,
	.mmap = privcmd_buf_mmap,
};
EXPORT_SYMBOL_GPL(xen_privcmdbuf_fops);

struct miscdevice xen_privcmdbuf_dev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "xen/hypercall",
	.fops = &xen_privcmdbuf_fops,
};

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/list.h`, `linux/miscdevice.h`, `linux/mm.h`, `linux/slab.h`, `privcmd.h`.
• Detected declarations: `struct privcmd_buf_private`, `struct privcmd_buf_vma_private`, `function privcmd_buf_open`, `function privcmd_buf_vmapriv_free`, `function privcmd_buf_release`, `function privcmd_buf_vma_open`, `function privcmd_buf_vma_close`, `function privcmd_buf_vma_fault`, `function privcmd_buf_mmap`, `export xen_privcmdbuf_fops`.
• Atlas domain: Driver Families / drivers/xen.
• Implementation status: pattern 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.