drivers/infiniband/hw/usnic/usnic_uiom_interval_tree.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/hw/usnic/usnic_uiom_interval_tree.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/hw/usnic/usnic_uiom_interval_tree.c
Extension
.c
Size
7408 bytes
Lines
272
Domain
Driver Families
Bucket
drivers/infiniband
Inferred role
Driver Families: implementation source
Status
source 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

if (!node) {				\
					err = -ENOMEM;			\
					goto err_out;			\
				}					\
		} while (0)

#define MARK_FOR_ADD(node, list) (list_add_tail(&node->link, list))

#define MAKE_NODE_AND_APPEND(node, start, end, ref_cnt, flags, err,	\
				err_out, list)				\
				do {					\
					MAKE_NODE(node, start, end,	\
						ref_cnt, flags, err,	\
						err_out);		\
					MARK_FOR_ADD(node, list);	\
				} while (0)

#define FLAGS_EQUAL(flags1, flags2, mask)				\
			(((flags1) & (mask)) == ((flags2) & (mask)))

static struct usnic_uiom_interval_node*
usnic_uiom_interval_node_alloc(long int start, long int last, int ref_cnt,
				int flags)
{
	struct usnic_uiom_interval_node *interval = kzalloc_obj(*interval,
								GFP_ATOMIC);
	if (!interval)
		return NULL;

	interval->start = start;
	interval->last = last;
	interval->flags = flags;
	interval->ref_cnt = ref_cnt;

	return interval;
}

static int interval_cmp(void *priv, const struct list_head *a,
			const struct list_head *b)
{
	struct usnic_uiom_interval_node *node_a, *node_b;

	node_a = list_entry(a, struct usnic_uiom_interval_node, link);
	node_b = list_entry(b, struct usnic_uiom_interval_node, link);

	/* long to int */
	if (node_a->start < node_b->start)
		return -1;
	else if (node_a->start > node_b->start)
		return 1;

	return 0;
}

static void
find_intervals_intersection_sorted(struct rb_root_cached *root,
				   unsigned long start, unsigned long last,
				   struct list_head *list)
{
	struct usnic_uiom_interval_node *node;

	INIT_LIST_HEAD(list);

	for (node = usnic_uiom_interval_tree_iter_first(root, start, last);
		node;
		node = usnic_uiom_interval_tree_iter_next(node, start, last))
		list_add_tail(&node->link, list);

	list_sort(NULL, list, interval_cmp);
}

int usnic_uiom_get_intervals_diff(unsigned long start, unsigned long last,
					int flags, int flag_mask,
					struct rb_root_cached *root,
					struct list_head *diff_set)
{
	struct usnic_uiom_interval_node *interval, *tmp;
	int err = 0;
	long int pivot = start;
	LIST_HEAD(intersection_set);

	INIT_LIST_HEAD(diff_set);

	find_intervals_intersection_sorted(root, start, last,
						&intersection_set);

	list_for_each_entry(interval, &intersection_set, link) {
		if (pivot < interval->start) {
			MAKE_NODE_AND_APPEND(tmp, pivot, interval->start - 1,
						1, flags, err, err_out,

Annotation

Implementation Notes