drivers/watchdog/hpwdt.c

File Facts

System

Linux kernel

Corpus path

drivers/watchdog/hpwdt.c

Extension

.c

Size

11039 bytes

Lines

446

Domain

Driver Families

Bucket

drivers/watchdog

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

Dependency Surface

• linux/device.h
• linux/hex.h
• linux/io.h
• linux/kernel.h
• linux/module.h
• linux/moduleparam.h
• linux/pci.h
• linux/pci_ids.h
• linux/types.h
• linux/watchdog.h
• asm/nmi.h
• asm/uv/uv.h
• linux/crash_dump.h

Detected Declarations

• function hpwdt_hw_is_running
• function hpwdt_start
• function hpwdt_stop
• function hpwdt_stop_core
• function hpwdt_ping_ticks
• function hpwdt_ping
• function hpwdt_gettimeleft
• function hpwdt_settimeout
• function hpwdt_set_pretimeout
• function hpwdt_pretimeout
• function hpwdt_init_nmi_decoding
• function hpwdt_exit_nmi_decoding
• function hpwdt_init_one
• function hpwdt_exit
• function hpwdt_suspend
• function hpwdt_resume

Annotated Snippet

static struct pci_driver hpwdt_driver = {
	.name = "hpwdt",
	.id_table = hpwdt_devices,
	.probe = hpwdt_init_one,
	.remove = hpwdt_exit,

	.driver = {
		.name = "hpwdt",
		.pm = &hpwdt_pm_ops,
	}
};

MODULE_AUTHOR("Tom Mingarelli");
MODULE_DESCRIPTION("hpe watchdog driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(HPWDT_VERSION);

module_param(soft_margin, int, 0);
MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");

module_param_named(timeout, soft_margin, int, 0);
MODULE_PARM_DESC(timeout, "Alias of soft_margin");

module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

module_param(kdumptimeout, int, 0444);
MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds");

#ifdef CONFIG_HPWDT_NMI_DECODING
module_param(pretimeout, bool, 0);
MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
#endif

module_pci_driver(hpwdt_driver);

Annotation

• Immediate include surface: `linux/device.h`, `linux/hex.h`, `linux/io.h`, `linux/kernel.h`, `linux/module.h`, `linux/moduleparam.h`, `linux/pci.h`, `linux/pci_ids.h`.
• Detected declarations: `function hpwdt_hw_is_running`, `function hpwdt_start`, `function hpwdt_stop`, `function hpwdt_stop_core`, `function hpwdt_ping_ticks`, `function hpwdt_ping`, `function hpwdt_gettimeleft`, `function hpwdt_settimeout`, `function hpwdt_set_pretimeout`, `function hpwdt_pretimeout`.
• Atlas domain: Driver Families / drivers/watchdog.
• Implementation status: pattern 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.