include/linux/dca.h

File Facts

System

Linux kernel

Corpus path

include/linux/dca.h

Extension

.h

Size

1922 bytes

Lines

67

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/pci.h

Detected Declarations

• struct dca_provider
• struct dca_domain
• struct dca_ops

Annotated Snippet

struct dca_provider {
	struct list_head	node;
	const struct dca_ops	*ops;
	struct device 		*cd;
	int			 id;
};

struct dca_domain {
	struct list_head	node;
	struct list_head	dca_providers;
	struct pci_bus		*pci_rc;
};

struct dca_ops {
	int	(*add_requester)    (struct dca_provider *, struct device *);
	int	(*remove_requester) (struct dca_provider *, struct device *);
	u8	(*get_tag)	    (struct dca_provider *, struct device *,
				     int cpu);
	int	(*dev_managed)      (struct dca_provider *, struct device *);
};

struct dca_provider *alloc_dca_provider(const struct dca_ops *ops,
					int priv_size);
void free_dca_provider(struct dca_provider *dca);
int register_dca_provider(struct dca_provider *dca, struct device *dev);
void unregister_dca_provider(struct dca_provider *dca, struct device *dev);

static inline void *dca_priv(struct dca_provider *dca)
{
	return (void *)dca + sizeof(struct dca_provider);
}

/* Requester API */
#define DCA_GET_TAG_TWO_ARGS
int dca_add_requester(struct device *dev);
int dca_remove_requester(struct device *dev);
u8 dca_get_tag(int cpu);
u8 dca3_get_tag(struct device *dev, int cpu);

/* internal stuff */
int __init dca_sysfs_init(void);
void __exit dca_sysfs_exit(void);
int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev);
void dca_sysfs_remove_provider(struct dca_provider *dca);
int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot);
void dca_sysfs_remove_req(struct dca_provider *dca, int slot);

#endif /* DCA_H */

Annotation

• Immediate include surface: `linux/pci.h`.
• Detected declarations: `struct dca_provider`, `struct dca_domain`, `struct dca_ops`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source 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.