drivers/platform/x86/amd/hsmp/hsmp.c

File Facts

System

Linux kernel

Corpus path

drivers/platform/x86/amd/hsmp/hsmp.c

Extension

.c

Size

12240 bytes

Lines

467

Domain

Driver Families

Bucket

drivers/platform

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

Dependency Surface

• asm/amd/hsmp.h
• linux/acpi.h
• linux/delay.h
• linux/device.h
• linux/semaphore.h
• linux/sysfs.h
• hsmp.h

Detected Declarations

• function __hsmp_send_message
• function validate_message
• function hsmp_send_message
• function hsmp_msg_get_nargs
• function hsmp_test
• function is_get_msg
• function hsmp_ioctl
• function hsmp_metric_tbl_read
• function hsmp_get_tbl_dram_base
• function hsmp_cache_proto_ver
• function hsmp_misc_register
• function hsmp_misc_deregister

Annotated Snippet

static const struct file_operations hsmp_fops = {
	.owner		= THIS_MODULE,
	.unlocked_ioctl	= hsmp_ioctl,
	.compat_ioctl	= hsmp_ioctl,
};

int hsmp_misc_register(struct device *dev)
{
	hsmp_pdev.mdev.name	= HSMP_CDEV_NAME;
	hsmp_pdev.mdev.minor	= MISC_DYNAMIC_MINOR;
	hsmp_pdev.mdev.fops	= &hsmp_fops;
	hsmp_pdev.mdev.parent	= dev;
	hsmp_pdev.mdev.nodename	= HSMP_DEVNODE_NAME;
	hsmp_pdev.mdev.mode	= 0644;

	return misc_register(&hsmp_pdev.mdev);
}
EXPORT_SYMBOL_NS_GPL(hsmp_misc_register, "AMD_HSMP");

void hsmp_misc_deregister(void)
{
	misc_deregister(&hsmp_pdev.mdev);
}
EXPORT_SYMBOL_NS_GPL(hsmp_misc_deregister, "AMD_HSMP");

struct hsmp_plat_device *get_hsmp_pdev(void)
{
	return &hsmp_pdev;
}
EXPORT_SYMBOL_NS_GPL(get_hsmp_pdev, "AMD_HSMP");

MODULE_DESCRIPTION("AMD HSMP Common driver");
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `asm/amd/hsmp.h`, `linux/acpi.h`, `linux/delay.h`, `linux/device.h`, `linux/semaphore.h`, `linux/sysfs.h`, `hsmp.h`.
• Detected declarations: `function __hsmp_send_message`, `function validate_message`, `function hsmp_send_message`, `function hsmp_msg_get_nargs`, `function hsmp_test`, `function is_get_msg`, `function hsmp_ioctl`, `function hsmp_metric_tbl_read`, `function hsmp_get_tbl_dram_base`, `function hsmp_cache_proto_ver`.
• Atlas domain: Driver Families / drivers/platform.
• 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.