drivers/dma/amd/ptdma/ptdma-pci.c

File Facts

System

Linux kernel

Corpus path

drivers/dma/amd/ptdma/ptdma-pci.c

Extension

.c

Size

4743 bytes

Lines

244

Domain

Driver Families

Bucket

drivers/dma

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 IRQ or DMA behavior; this matters for the representative real-device path.
• 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/device.h
• linux/dma-mapping.h
• linux/delay.h
• linux/interrupt.h
• linux/kernel.h
• linux/kthread.h
• linux/module.h
• linux/pci_ids.h
• linux/pci.h
• linux/spinlock.h
• ptdma.h

Detected Declarations

• struct pt_msix
• function pt_get_msix_irqs
• function pt_get_msi_irq
• function pt_get_irqs
• function pt_free_irqs
• function pt_pci_probe
• function pt_pci_remove

Annotated Snippet

static struct pci_driver pt_pci_driver = {
	.name = "ptdma",
	.id_table = pt_pci_table,
	.probe = pt_pci_probe,
	.remove = pt_pci_remove,
};

module_pci_driver(pt_pci_driver);

MODULE_AUTHOR("Sanjay R Mehta <sanju.mehta@amd.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("AMD PassThru DMA driver");

Annotation

• Immediate include surface: `linux/device.h`, `linux/dma-mapping.h`, `linux/delay.h`, `linux/interrupt.h`, `linux/kernel.h`, `linux/kthread.h`, `linux/module.h`, `linux/pci_ids.h`.
• Detected declarations: `struct pt_msix`, `function pt_get_msix_irqs`, `function pt_get_msi_irq`, `function pt_get_irqs`, `function pt_free_irqs`, `function pt_pci_probe`, `function pt_pci_remove`.
• Atlas domain: Driver Families / drivers/dma.
• Implementation status: pattern implementation candidate.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.