1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
4 */
5
6 #include <linux/device.h>
7 #include <linux/gunyah.h>
8 #include <linux/module.h>
9 #include <linux/rwsem.h>
10
11 #include "rsc_mgr.h"
12
13 static const struct gunyah_rm_platform_ops *rm_platform_ops;
14 static DECLARE_RWSEM(rm_platform_ops_lock);
15
gunyah_rm_platform_pre_mem_share(struct gunyah_rm * rm,struct gunyah_rm_mem_parcel * mem_parcel)16 int gunyah_rm_platform_pre_mem_share(struct gunyah_rm *rm,
17 struct gunyah_rm_mem_parcel *mem_parcel)
18 {
19 int ret = 0;
20
21 down_read(&rm_platform_ops_lock);
22 if (rm_platform_ops && rm_platform_ops->pre_mem_share)
23 ret = rm_platform_ops->pre_mem_share(rm, mem_parcel);
24 up_read(&rm_platform_ops_lock);
25 return ret;
26 }
27 EXPORT_SYMBOL_GPL(gunyah_rm_platform_pre_mem_share);
28
gunyah_rm_platform_post_mem_reclaim(struct gunyah_rm * rm,struct gunyah_rm_mem_parcel * mem_parcel)29 int gunyah_rm_platform_post_mem_reclaim(struct gunyah_rm *rm,
30 struct gunyah_rm_mem_parcel *mem_parcel)
31 {
32 int ret = 0;
33
34 down_read(&rm_platform_ops_lock);
35 if (rm_platform_ops && rm_platform_ops->post_mem_reclaim)
36 ret = rm_platform_ops->post_mem_reclaim(rm, mem_parcel);
37 up_read(&rm_platform_ops_lock);
38 return ret;
39 }
40 EXPORT_SYMBOL_GPL(gunyah_rm_platform_post_mem_reclaim);
41
gunyah_rm_platform_pre_demand_page(struct gunyah_rm * rm,u16 vmid,enum gunyah_pagetable_access access,struct folio * folio)42 int gunyah_rm_platform_pre_demand_page(struct gunyah_rm *rm, u16 vmid,
43 enum gunyah_pagetable_access access,
44 struct folio *folio)
45 {
46 int ret = 0;
47
48 down_read(&rm_platform_ops_lock);
49 if (rm_platform_ops && rm_platform_ops->pre_demand_page)
50 ret = rm_platform_ops->pre_demand_page(rm, vmid, access, folio);
51 up_read(&rm_platform_ops_lock);
52 return ret;
53 }
54 EXPORT_SYMBOL_GPL(gunyah_rm_platform_pre_demand_page);
55
gunyah_rm_platform_reclaim_demand_page(struct gunyah_rm * rm,u16 vmid,enum gunyah_pagetable_access access,struct folio * folio)56 int gunyah_rm_platform_reclaim_demand_page(struct gunyah_rm *rm, u16 vmid,
57 enum gunyah_pagetable_access access,
58 struct folio *folio)
59 {
60 int ret = 0;
61
62 down_read(&rm_platform_ops_lock);
63 if (rm_platform_ops && rm_platform_ops->pre_demand_page)
64 ret = rm_platform_ops->release_demand_page(rm, vmid, access,
65 folio);
66 up_read(&rm_platform_ops_lock);
67 return ret;
68 }
69 EXPORT_SYMBOL_GPL(gunyah_rm_platform_reclaim_demand_page);
70
gunyah_rm_register_platform_ops(const struct gunyah_rm_platform_ops * platform_ops)71 int gunyah_rm_register_platform_ops(
72 const struct gunyah_rm_platform_ops *platform_ops)
73 {
74 int ret = 0;
75
76 down_write(&rm_platform_ops_lock);
77 if (!rm_platform_ops)
78 rm_platform_ops = platform_ops;
79 else
80 ret = -EEXIST;
81 up_write(&rm_platform_ops_lock);
82 return ret;
83 }
84 EXPORT_SYMBOL_GPL(gunyah_rm_register_platform_ops);
85
gunyah_rm_unregister_platform_ops(const struct gunyah_rm_platform_ops * platform_ops)86 void gunyah_rm_unregister_platform_ops(
87 const struct gunyah_rm_platform_ops *platform_ops)
88 {
89 down_write(&rm_platform_ops_lock);
90 if (rm_platform_ops == platform_ops)
91 rm_platform_ops = NULL;
92 up_write(&rm_platform_ops_lock);
93 }
94 EXPORT_SYMBOL_GPL(gunyah_rm_unregister_platform_ops);
95
_devm_gunyah_rm_unregister_platform_ops(void * data)96 static void _devm_gunyah_rm_unregister_platform_ops(void *data)
97 {
98 gunyah_rm_unregister_platform_ops(
99 (const struct gunyah_rm_platform_ops *)data);
100 }
101
devm_gunyah_rm_register_platform_ops(struct device * dev,const struct gunyah_rm_platform_ops * ops)102 int devm_gunyah_rm_register_platform_ops(
103 struct device *dev, const struct gunyah_rm_platform_ops *ops)
104 {
105 int ret;
106
107 ret = gunyah_rm_register_platform_ops(ops);
108 if (ret)
109 return ret;
110
111 return devm_add_action(dev, _devm_gunyah_rm_unregister_platform_ops,
112 (void *)ops);
113 }
114 EXPORT_SYMBOL_GPL(devm_gunyah_rm_register_platform_ops);
115
116 MODULE_LICENSE("GPL");
117 MODULE_DESCRIPTION("Gunyah Platform Hooks");
118