drivers/infiniband/core/uverbs_std_types_dm.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/core/uverbs_std_types_dm.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/core/uverbs_std_types_dm.c
Extension
.c
Size
3494 bytes
Lines
117
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

#include "rdma_core.h"
#include "uverbs.h"
#include <rdma/uverbs_std_types.h>

static int uverbs_free_dm(struct ib_uobject *uobject,
			  enum rdma_remove_reason why,
			  struct uverbs_attr_bundle *attrs)
{
	struct ib_dm *dm = uobject->object;

	if (atomic_read(&dm->usecnt))
		return -EBUSY;

	return dm->device->ops.dealloc_dm(dm, attrs);
}

static int UVERBS_HANDLER(UVERBS_METHOD_DM_ALLOC)(
	struct uverbs_attr_bundle *attrs)
{
	struct ib_dm_alloc_attr attr = {};
	struct ib_uobject *uobj =
		uverbs_attr_get(attrs, UVERBS_ATTR_ALLOC_DM_HANDLE)
			->obj_attr.uobject;
	struct ib_device *ib_dev = attrs->context->device;
	struct ib_dm *dm;
	int ret;

	if (!ib_dev->ops.alloc_dm)
		return -EOPNOTSUPP;

	ret = uverbs_copy_from(&attr.length, attrs,
			       UVERBS_ATTR_ALLOC_DM_LENGTH);
	if (ret)
		return ret;

	ret = uverbs_copy_from(&attr.alignment, attrs,
			       UVERBS_ATTR_ALLOC_DM_ALIGNMENT);
	if (ret)
		return ret;

	dm = ib_dev->ops.alloc_dm(ib_dev, attrs->context, &attr, attrs);
	if (IS_ERR(dm))
		return PTR_ERR(dm);

	dm->device  = ib_dev;
	dm->length  = attr.length;
	dm->uobject = uobj;
	atomic_set(&dm->usecnt, 0);

	uobj->object = dm;

	return 0;
}

DECLARE_UVERBS_NAMED_METHOD(
	UVERBS_METHOD_DM_ALLOC,
	UVERBS_ATTR_IDR(UVERBS_ATTR_ALLOC_DM_HANDLE,
			UVERBS_OBJECT_DM,
			UVERBS_ACCESS_NEW,
			UA_MANDATORY),
	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_LENGTH,
			   UVERBS_ATTR_TYPE(u64),
			   UA_MANDATORY),
	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_ALIGNMENT,
			   UVERBS_ATTR_TYPE(u32),
			   UA_MANDATORY));

DECLARE_UVERBS_NAMED_METHOD_DESTROY(
	UVERBS_METHOD_DM_FREE,
	UVERBS_ATTR_IDR(UVERBS_ATTR_FREE_DM_HANDLE,
			UVERBS_OBJECT_DM,
			UVERBS_ACCESS_DESTROY,
			UA_MANDATORY));

DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_DM,
			    UVERBS_TYPE_ALLOC_IDR(uverbs_free_dm),
			    &UVERBS_METHOD(UVERBS_METHOD_DM_ALLOC),
			    &UVERBS_METHOD(UVERBS_METHOD_DM_FREE));

const struct uapi_definition uverbs_def_obj_dm[] = {
	UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_DM,
				      UAPI_DEF_OBJ_NEEDS_FN(dealloc_dm)),
	{}
};

Annotation

Implementation Notes