1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2016 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include "msm_drv.h"
8#include "msm_fence.h"
9#include "msm_gem.h"
10#include "msm_mmu.h"
11
12static void
13msm_gem_address_space_destroy(struct kref *kref)
14{
15 struct msm_gem_address_space *aspace = container_of(kref,
16 struct msm_gem_address_space, kref);
17
18 drm_mm_takedown(mm: &aspace->mm);
19 if (aspace->mmu)
20 aspace->mmu->funcs->destroy(aspace->mmu);
21 put_pid(pid: aspace->pid);
22 kfree(objp: aspace);
23}
24
25
26void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
27{
28 if (aspace)
29 kref_put(kref: &aspace->kref, release: msm_gem_address_space_destroy);
30}
31
32struct msm_gem_address_space *
33msm_gem_address_space_get(struct msm_gem_address_space *aspace)
34{
35 if (!IS_ERR_OR_NULL(ptr: aspace))
36 kref_get(kref: &aspace->kref);
37
38 return aspace;
39}
40
41/* Actually unmap memory for the vma */
42void msm_gem_vma_purge(struct msm_gem_vma *vma)
43{
44 struct msm_gem_address_space *aspace = vma->aspace;
45 unsigned size = vma->node.size;
46
47 /* Don't do anything if the memory isn't mapped */
48 if (!vma->mapped)
49 return;
50
51 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size);
52
53 vma->mapped = false;
54}
55
56/* Map and pin vma: */
57int
58msm_gem_vma_map(struct msm_gem_vma *vma, int prot,
59 struct sg_table *sgt, int size)
60{
61 struct msm_gem_address_space *aspace = vma->aspace;
62 int ret;
63
64 if (GEM_WARN_ON(!vma->iova))
65 return -EINVAL;
66
67 if (vma->mapped)
68 return 0;
69
70 vma->mapped = true;
71
72 if (!aspace)
73 return 0;
74
75 /*
76 * NOTE: iommu/io-pgtable can allocate pages, so we cannot hold
77 * a lock across map/unmap which is also used in the job_run()
78 * path, as this can cause deadlock in job_run() vs shrinker/
79 * reclaim.
80 *
81 * Revisit this if we can come up with a scheme to pre-alloc pages
82 * for the pgtable in map/unmap ops.
83 */
84 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt, size, prot);
85
86 if (ret) {
87 vma->mapped = false;
88 }
89
90 return ret;
91}
92
93/* Close an iova. Warn if it is still in use */
94void msm_gem_vma_close(struct msm_gem_vma *vma)
95{
96 struct msm_gem_address_space *aspace = vma->aspace;
97
98 GEM_WARN_ON(vma->mapped);
99
100 spin_lock(lock: &aspace->lock);
101 if (vma->iova)
102 drm_mm_remove_node(node: &vma->node);
103 spin_unlock(lock: &aspace->lock);
104
105 vma->iova = 0;
106
107 msm_gem_address_space_put(aspace);
108}
109
110struct msm_gem_vma *msm_gem_vma_new(struct msm_gem_address_space *aspace)
111{
112 struct msm_gem_vma *vma;
113
114 vma = kzalloc(size: sizeof(*vma), GFP_KERNEL);
115 if (!vma)
116 return NULL;
117
118 vma->aspace = aspace;
119
120 return vma;
121}
122
123/* Initialize a new vma and allocate an iova for it */
124int msm_gem_vma_init(struct msm_gem_vma *vma, int size,
125 u64 range_start, u64 range_end)
126{
127 struct msm_gem_address_space *aspace = vma->aspace;
128 int ret;
129
130 if (GEM_WARN_ON(!aspace))
131 return -EINVAL;
132
133 if (GEM_WARN_ON(vma->iova))
134 return -EBUSY;
135
136 spin_lock(lock: &aspace->lock);
137 ret = drm_mm_insert_node_in_range(mm: &aspace->mm, node: &vma->node,
138 size, PAGE_SIZE, color: 0,
139 start: range_start, end: range_end, mode: 0);
140 spin_unlock(lock: &aspace->lock);
141
142 if (ret)
143 return ret;
144
145 vma->iova = vma->node.start;
146 vma->mapped = false;
147
148 kref_get(kref: &aspace->kref);
149
150 return 0;
151}
152
153struct msm_gem_address_space *
154msm_gem_address_space_create(struct msm_mmu *mmu, const char *name,
155 u64 va_start, u64 size)
156{
157 struct msm_gem_address_space *aspace;
158
159 if (IS_ERR(ptr: mmu))
160 return ERR_CAST(ptr: mmu);
161
162 aspace = kzalloc(size: sizeof(*aspace), GFP_KERNEL);
163 if (!aspace)
164 return ERR_PTR(error: -ENOMEM);
165
166 spin_lock_init(&aspace->lock);
167 aspace->name = name;
168 aspace->mmu = mmu;
169 aspace->va_start = va_start;
170 aspace->va_size = size;
171
172 drm_mm_init(mm: &aspace->mm, start: va_start, size);
173
174 kref_init(kref: &aspace->kref);
175
176 return aspace;
177}
178

source code of linux/drivers/gpu/drm/msm/msm_gem_vma.c