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ioport: Add resource check helpers

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Add resource_overlaps() and resource_contains() helpers.
Code copied from kernel source.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Patrice Chotard
2025-09-18 17:20:39 +02:00
parent 0b5ae33eb3
commit 08ccc1f56c
1 changed files with 16 additions and 0 deletions
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include/linux/ioport.h
+16
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@@ -135,6 +135,22 @@ static inline unsigned long resource_type(const struct resource *res)
return res->flags & IORESOURCE_TYPE_BITS;
}
/* True iff r1 completely contains r2 */
static inline bool resource_contains(struct resource *r1, struct resource *r2)
{
if (resource_type(r1) != resource_type(r2))
return false;
if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
return false;
return r1->start <= r2->start && r1->end >= r2->end;
}
/* True if any part of r1 overlaps r2 */
static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
{
return r1->start <= r2->end && r1->end >= r2->start;
}
/* Convenience shorthand with allocation */
#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
#define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)