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/* SPDX-License-Identifier: GPL-2.0 */
/*
* IOMMU domain allocator for edgetpu
*
* Copyright (C) 2022 Google LLC
*/
#ifndef __EDGETPU_DOMAIN_POOL_H__
#define __EDGETPU_DOMAIN_POOL_H__
#include <linux/idr.h>
#include <linux/iommu.h>
#include "edgetpu-internal.h"
struct edgetpu_domain_pool {
struct ida idp; /* ID allocator to keep track of used domains. */
/*
* Size of the pool. Can be set to 0, in which case the implementation will fall back to
* dynamic domain allocation using the IOMMU API directly.
*/
unsigned int size;
struct iommu_domain **array; /* Array holding the pointers to pre-allocated domains. */
struct edgetpu_dev *etdev; /* The edgetpu device used for logging warnings/errors. */
};
/*
* Initializes a domain pool.
*
* @etdev: pointer to edgeptu device.
* @pool: caller-allocated pool structure.
* @size: size of the pre-allocated domains pool.
* Set to zero to fall back to dynamically allocated domains.
*
* returns 0 on success or negative error value.
*/
int edgetpu_domain_pool_init(struct edgetpu_dev *etdev, struct edgetpu_domain_pool *pool,
unsigned int size);
/*
* Allocates a domain from the pool
* returns NULL on error.
*/
struct iommu_domain *edgetpu_domain_pool_alloc(struct edgetpu_domain_pool *pool);
/* Releases a domain from the pool. */
void edgetpu_domain_pool_free(struct edgetpu_domain_pool *pool, struct iommu_domain *domain);
/* Cleans up all resources used by the domain pool. */
void edgetpu_domain_pool_destroy(struct edgetpu_domain_pool *pool);
#endif /* __EDGETPU_DOMAIN_POOL_H__ */
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