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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_gem.h"
9#include "msm_mmu.h"
10
11static void
12msm_gem_address_space_destroy(struct kref *kref)
13{
14 struct msm_gem_address_space *aspace = container_of(kref,
15 struct msm_gem_address_space, kref);
16
17 drm_mm_takedown(&aspace->mm);
18 if (aspace->mmu)
19 aspace->mmu->funcs->destroy(aspace->mmu);
20 kfree(aspace);
21}
22
23
24void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
25{
26 if (aspace)
27 kref_put(&aspace->kref, msm_gem_address_space_destroy);
28}
29
30/* Actually unmap memory for the vma */
31void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
32 struct msm_gem_vma *vma)
33{
34 unsigned size = vma->node.size << PAGE_SHIFT;
35
36 /* Print a message if we try to purge a vma in use */
37 if (WARN_ON(vma->inuse > 0))
38 return;
39
40 /* Don't do anything if the memory isn't mapped */
41 if (!vma->mapped)
42 return;
43
44 if (aspace->mmu)
45 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size);
46
47 vma->mapped = false;
48}
49
50/* Remove reference counts for the mapping */
51void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
52 struct msm_gem_vma *vma)
53{
54 if (!WARN_ON(!vma->iova))
55 vma->inuse--;
56}
57
58int
59msm_gem_map_vma(struct msm_gem_address_space *aspace,
60 struct msm_gem_vma *vma, int prot,
61 struct sg_table *sgt, int npages)
62{
63 unsigned size = npages << PAGE_SHIFT;
64 int ret = 0;
65
66 if (WARN_ON(!vma->iova))
67 return -EINVAL;
68
69 /* Increase the usage counter */
70 vma->inuse++;
71
72 if (vma->mapped)
73 return 0;
74
75 vma->mapped = true;
76
77 if (aspace && aspace->mmu)
78 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
79 size, prot);
80
81 if (ret)
82 vma->mapped = false;
83
84 return ret;
85}
86
87/* Close an iova. Warn if it is still in use */
88void msm_gem_close_vma(struct msm_gem_address_space *aspace,
89 struct msm_gem_vma *vma)
90{
91 if (WARN_ON(vma->inuse > 0 || vma->mapped))
92 return;
93
94 spin_lock(&aspace->lock);
95 if (vma->iova)
96 drm_mm_remove_node(&vma->node);
97 spin_unlock(&aspace->lock);
98
99 vma->iova = 0;
100
101 msm_gem_address_space_put(aspace);
102}
103
104/* Initialize a new vma and allocate an iova for it */
105int msm_gem_init_vma(struct msm_gem_address_space *aspace,
106 struct msm_gem_vma *vma, int npages)
107{
108 int ret;
109
110 if (WARN_ON(vma->iova))
111 return -EBUSY;
112
113 spin_lock(&aspace->lock);
114 ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages);
115 spin_unlock(&aspace->lock);
116
117 if (ret)
118 return ret;
119
120 vma->iova = vma->node.start << PAGE_SHIFT;
121 vma->mapped = false;
122
123 kref_get(&aspace->kref);
124
125 return 0;
126}
127
128
129struct msm_gem_address_space *
130msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
131 const char *name)
132{
133 struct msm_gem_address_space *aspace;
134 u64 size = domain->geometry.aperture_end -
135 domain->geometry.aperture_start;
136
137 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
138 if (!aspace)
139 return ERR_PTR(-ENOMEM);
140
141 spin_lock_init(&aspace->lock);
142 aspace->name = name;
143 aspace->mmu = msm_iommu_new(dev, domain);
144
145 drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT),
146 size >> PAGE_SHIFT);
147
148 kref_init(&aspace->kref);
149
150 return aspace;
151}
152
153struct msm_gem_address_space *
154msm_gem_address_space_create_a2xx(struct device *dev, struct msm_gpu *gpu,
155 const char *name, uint64_t va_start, uint64_t va_end)
156{
157 struct msm_gem_address_space *aspace;
158 u64 size = va_end - va_start;
159
160 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
161 if (!aspace)
162 return ERR_PTR(-ENOMEM);
163
164 spin_lock_init(&aspace->lock);
165 aspace->name = name;
166 aspace->mmu = msm_gpummu_new(dev, gpu);
167
168 drm_mm_init(&aspace->mm, (va_start >> PAGE_SHIFT),
169 size >> PAGE_SHIFT);
170
171 kref_init(&aspace->kref);
172
173 return aspace;
174}
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_gem.h"
9#include "msm_mmu.h"
10
11static void
12msm_gem_address_space_destroy(struct kref *kref)
13{
14 struct msm_gem_address_space *aspace = container_of(kref,
15 struct msm_gem_address_space, kref);
16
17 drm_mm_takedown(&aspace->mm);
18 if (aspace->mmu)
19 aspace->mmu->funcs->destroy(aspace->mmu);
20 put_pid(aspace->pid);
21 kfree(aspace);
22}
23
24
25void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
26{
27 if (aspace)
28 kref_put(&aspace->kref, msm_gem_address_space_destroy);
29}
30
31struct msm_gem_address_space *
32msm_gem_address_space_get(struct msm_gem_address_space *aspace)
33{
34 if (!IS_ERR_OR_NULL(aspace))
35 kref_get(&aspace->kref);
36
37 return aspace;
38}
39
40/* Actually unmap memory for the vma */
41void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
42 struct msm_gem_vma *vma)
43{
44 unsigned size = vma->node.size << PAGE_SHIFT;
45
46 /* Print a message if we try to purge a vma in use */
47 if (WARN_ON(vma->inuse > 0))
48 return;
49
50 /* Don't do anything if the memory isn't mapped */
51 if (!vma->mapped)
52 return;
53
54 if (aspace->mmu)
55 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size);
56
57 vma->mapped = false;
58}
59
60/* Remove reference counts for the mapping */
61void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
62 struct msm_gem_vma *vma)
63{
64 if (!WARN_ON(!vma->iova))
65 vma->inuse--;
66}
67
68int
69msm_gem_map_vma(struct msm_gem_address_space *aspace,
70 struct msm_gem_vma *vma, int prot,
71 struct sg_table *sgt, int npages)
72{
73 unsigned size = npages << PAGE_SHIFT;
74 int ret = 0;
75
76 if (WARN_ON(!vma->iova))
77 return -EINVAL;
78
79 /* Increase the usage counter */
80 vma->inuse++;
81
82 if (vma->mapped)
83 return 0;
84
85 vma->mapped = true;
86
87 if (aspace && aspace->mmu)
88 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
89 size, prot);
90
91 if (ret) {
92 vma->mapped = false;
93 vma->inuse--;
94 }
95
96 return ret;
97}
98
99/* Close an iova. Warn if it is still in use */
100void msm_gem_close_vma(struct msm_gem_address_space *aspace,
101 struct msm_gem_vma *vma)
102{
103 if (WARN_ON(vma->inuse > 0 || vma->mapped))
104 return;
105
106 spin_lock(&aspace->lock);
107 if (vma->iova)
108 drm_mm_remove_node(&vma->node);
109 spin_unlock(&aspace->lock);
110
111 vma->iova = 0;
112
113 msm_gem_address_space_put(aspace);
114}
115
116/* Initialize a new vma and allocate an iova for it */
117int msm_gem_init_vma(struct msm_gem_address_space *aspace,
118 struct msm_gem_vma *vma, int npages,
119 u64 range_start, u64 range_end)
120{
121 int ret;
122
123 if (WARN_ON(vma->iova))
124 return -EBUSY;
125
126 spin_lock(&aspace->lock);
127 ret = drm_mm_insert_node_in_range(&aspace->mm, &vma->node, npages, 0,
128 0, range_start, range_end, 0);
129 spin_unlock(&aspace->lock);
130
131 if (ret)
132 return ret;
133
134 vma->iova = vma->node.start << PAGE_SHIFT;
135 vma->mapped = false;
136
137 kref_get(&aspace->kref);
138
139 return 0;
140}
141
142struct msm_gem_address_space *
143msm_gem_address_space_create(struct msm_mmu *mmu, const char *name,
144 u64 va_start, u64 size)
145{
146 struct msm_gem_address_space *aspace;
147
148 if (IS_ERR(mmu))
149 return ERR_CAST(mmu);
150
151 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
152 if (!aspace)
153 return ERR_PTR(-ENOMEM);
154
155 spin_lock_init(&aspace->lock);
156 aspace->name = name;
157 aspace->mmu = mmu;
158
159 drm_mm_init(&aspace->mm, va_start >> PAGE_SHIFT, size >> PAGE_SHIFT);
160
161 kref_init(&aspace->kref);
162
163 return aspace;
164}