drivers/acpi/arm64/iort.c

Source file repositories/reference/linux-study-clean/drivers/acpi/arm64/iort.c

File Facts

System
Linux kernel
Corpus path
drivers/acpi/arm64/iort.c
Extension
.c
Size
56348 bytes
Lines
2169
Domain
Driver Families
Bucket
drivers/acpi
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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.

Dependency Surface

Detected Declarations

Annotated Snippet

struct iort_its_msi_chip {
	struct list_head	list;
	struct fwnode_handle	*fw_node;
	phys_addr_t		base_addr;
	u32			translation_id;
};

struct iort_fwnode {
	struct list_head list;
	struct acpi_iort_node *iort_node;
	struct fwnode_handle *fwnode;
};
static LIST_HEAD(iort_fwnode_list);
static DEFINE_SPINLOCK(iort_fwnode_lock);

/**
 * iort_set_fwnode() - Create iort_fwnode and use it to register
 *		       iommu data in the iort_fwnode_list
 *
 * @iort_node: IORT table node associated with the IOMMU
 * @fwnode: fwnode associated with the IORT node
 *
 * Returns: 0 on success
 *          <0 on failure
 */
static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
				  struct fwnode_handle *fwnode)
{
	struct iort_fwnode *np;

	np = kzalloc_obj(struct iort_fwnode, GFP_ATOMIC);

	if (WARN_ON(!np))
		return -ENOMEM;

	INIT_LIST_HEAD(&np->list);
	np->iort_node = iort_node;
	np->fwnode = fwnode;

	spin_lock(&iort_fwnode_lock);
	list_add_tail(&np->list, &iort_fwnode_list);
	spin_unlock(&iort_fwnode_lock);

	return 0;
}

/**
 * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
 *
 * @node: IORT table node to be looked-up
 *
 * Returns: fwnode_handle pointer on success, NULL on failure
 */
static inline struct fwnode_handle *iort_get_fwnode(
			struct acpi_iort_node *node)
{
	struct iort_fwnode *curr;
	struct fwnode_handle *fwnode = NULL;

	spin_lock(&iort_fwnode_lock);
	list_for_each_entry(curr, &iort_fwnode_list, list) {
		if (curr->iort_node == node) {
			fwnode = curr->fwnode;
			break;
		}
	}
	spin_unlock(&iort_fwnode_lock);

	return fwnode;
}

/**
 * iort_delete_fwnode() - Delete fwnode associated with an IORT node
 *
 * @node: IORT table node associated with fwnode to delete
 */
static inline void iort_delete_fwnode(struct acpi_iort_node *node)
{
	struct iort_fwnode *curr, *tmp;

	spin_lock(&iort_fwnode_lock);
	list_for_each_entry_safe(curr, tmp, &iort_fwnode_list, list) {
		if (curr->iort_node == node) {
			list_del(&curr->list);
			kfree(curr);
			break;
		}
	}
	spin_unlock(&iort_fwnode_lock);
}

Annotation

Implementation Notes