drivers/s390/char/uvdevice.c

File Facts

System

Linux kernel

Corpus path

drivers/s390/char/uvdevice.c

Extension

.c

Size

16921 bytes

Lines

571

Domain

Driver Families

Bucket

drivers/s390

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.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• 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/module.h
• linux/kernel.h
• linux/miscdevice.h
• linux/types.h
• linux/stddef.h
• linux/vmalloc.h
• linux/slab.h
• linux/cpufeature.h
• asm/uvdevice.h
• asm/uv.h

Detected Declarations

• function set_supp_uv_cmds
• function uvio_uvdev_info
• function uvio_build_uvcb_attest
• function uvio_copy_attest_result_to_user
• function get_uvio_attest
• function uvio_attestation
• function uvio_add_secret
• function uvio_get_list
• function uvio_list_secrets
• function uvio_lock_secrets
• function uvio_retr_secret
• function uvio_copy_and_check_ioctl
• function uvio_ioctl
• function uvio_dev_exit
• function uvio_dev_init

Annotated Snippet

static const struct file_operations uvio_dev_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = uvio_ioctl,
};

static struct miscdevice uvio_dev_miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = UVIO_DEVICE_NAME,
	.fops = &uvio_dev_fops,
};

static void __exit uvio_dev_exit(void)
{
	misc_deregister(&uvio_dev_miscdev);
}

static int __init uvio_dev_init(void)
{
	set_supp_uv_cmds((unsigned long *)&uvdev_info.supp_uv_cmds);
	return misc_register(&uvio_dev_miscdev);
}

module_cpu_feature_match(S390_CPU_FEATURE_UV, uvio_dev_init);
module_exit(uvio_dev_exit);

MODULE_AUTHOR("IBM Corporation");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Ultravisor UAPI driver");

Annotation

• Immediate include surface: `linux/module.h`, `linux/kernel.h`, `linux/miscdevice.h`, `linux/types.h`, `linux/stddef.h`, `linux/vmalloc.h`, `linux/slab.h`, `linux/cpufeature.h`.
• Detected declarations: `function set_supp_uv_cmds`, `function uvio_uvdev_info`, `function uvio_build_uvcb_attest`, `function uvio_copy_attest_result_to_user`, `function get_uvio_attest`, `function uvio_attestation`, `function uvio_add_secret`, `function uvio_get_list`, `function uvio_list_secrets`, `function uvio_lock_secrets`.
• Atlas domain: Driver Families / drivers/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.