blob: b740bf9fa0a9e26b3ee0abf5db8f9efd88d35a62 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* GCIP IOMMU domain allocator.
*
* Copyright (C) 2022 Google LLC
*/
#ifndef __GCIP_DOMAIN_POOL_H__
#define __GCIP_DOMAIN_POOL_H__
#include <linux/idr.h>
#include <linux/iommu.h>
struct gcip_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 device *dev; /* The device used for logging warnings/errors. */
};
/*
* Initializes a domain pool.
*
* @dev: pointer to device structure.
* @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 gcip_domain_pool_init(struct device *dev, struct gcip_domain_pool *pool, unsigned int size);
/*
* Allocates a domain from the pool
* returns NULL on error.
*/
struct iommu_domain *gcip_domain_pool_alloc(struct gcip_domain_pool *pool);
/* Releases a domain from the pool. */
void gcip_domain_pool_free(struct gcip_domain_pool *pool, struct iommu_domain *domain);
/* Cleans up all resources used by the domain pool. */
void gcip_domain_pool_destroy(struct gcip_domain_pool *pool);
#endif /* __GCIP_DOMAIN_POOL_H__ */
|
