drivers/tee/qcomtee/mem_obj.c

Source file repositories/reference/linux-study-clean/drivers/tee/qcomtee/mem_obj.c

File Facts

System
Linux kernel
Corpus path
drivers/tee/qcomtee/mem_obj.c
Extension
.c
Size
4978 bytes
Lines
169
Domain
Driver Families
Bucket
drivers/tee
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

struct qcomtee_mem_object {
	struct qcomtee_object object;
	struct tee_shm *shm;
	/* QTEE requires these felids to be page aligned. */
	phys_addr_t paddr; /* Physical address of range. */
	size_t size; /* Size of the range. */
};

#define to_qcomtee_mem_object(o) \
	container_of((o), struct qcomtee_mem_object, object)

static struct qcomtee_object_operations qcomtee_mem_object_ops;

/* Is it a memory object using tee_shm? */
int is_qcomtee_memobj_object(struct qcomtee_object *object)
{
	return object != NULL_QCOMTEE_OBJECT &&
	       typeof_qcomtee_object(object) == QCOMTEE_OBJECT_TYPE_CB &&
	       object->ops == &qcomtee_mem_object_ops;
}

static int qcomtee_mem_object_dispatch(struct qcomtee_object_invoke_ctx *oic,
				       struct qcomtee_object *object, u32 op,
				       struct qcomtee_arg *args)
{
	return -EINVAL;
}

static void qcomtee_mem_object_release(struct qcomtee_object *object)
{
	struct qcomtee_mem_object *mem_object = to_qcomtee_mem_object(object);

	/* Matching get is in qcomtee_memobj_param_to_object(). */
	tee_shm_put(mem_object->shm);
	kfree(mem_object);
}

static struct qcomtee_object_operations qcomtee_mem_object_ops = {
	.release = qcomtee_mem_object_release,
	.dispatch = qcomtee_mem_object_dispatch,
};

/**
 * qcomtee_memobj_param_to_object() - OBJREF parameter to &struct qcomtee_object.
 * @object: object returned.
 * @param: TEE parameter.
 * @ctx: context in which the conversion should happen.
 *
 * @param is an OBJREF with %QCOMTEE_OBJREF_FLAG_MEM flags.
 *
 * Return: On success return 0 or <0 on failure.
 */
int qcomtee_memobj_param_to_object(struct qcomtee_object **object,
				   struct tee_param *param,
				   struct tee_context *ctx)
{
	struct tee_shm *shm;
	int err;

	struct qcomtee_mem_object *mem_object __free(kfree) = kzalloc_obj(*mem_object);
	if (!mem_object)
		return -ENOMEM;

	shm = tee_shm_get_from_id(ctx, param->u.objref.id);
	if (IS_ERR(shm))
		return PTR_ERR(shm);

	/* mem-object wrapping the memref. */
	err = qcomtee_object_user_init(&mem_object->object,
				       QCOMTEE_OBJECT_TYPE_CB,
				       &qcomtee_mem_object_ops, "tee-shm-%d",
				       shm->id);
	if (err) {
		tee_shm_put(shm);

		return err;
	}

	mem_object->paddr = shm->paddr;
	mem_object->size = shm->size;
	mem_object->shm = shm;

	*object = &no_free_ptr(mem_object)->object;

	return 0;
}

/* Reverse what qcomtee_memobj_param_to_object() does. */
int qcomtee_memobj_param_from_object(struct tee_param *param,
				     struct qcomtee_object *object,

Annotation

Implementation Notes