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
12 static void
msm_gem_address_space_destroy(struct kref * kref)13 msm_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(&aspace->mm);
19 if (aspace->mmu)
20 aspace->mmu->funcs->destroy(aspace->mmu);
21 put_pid(aspace->pid);
22 kfree(aspace);
23 }
24
25
msm_gem_address_space_put(struct msm_gem_address_space * aspace)26 void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
27 {
28 if (aspace)
29 kref_put(&aspace->kref, msm_gem_address_space_destroy);
30 }
31
32 struct msm_gem_address_space *
msm_gem_address_space_get(struct msm_gem_address_space * aspace)33 msm_gem_address_space_get(struct msm_gem_address_space *aspace)
34 {
35 if (!IS_ERR_OR_NULL(aspace))
36 kref_get(&aspace->kref);
37
38 return aspace;
39 }
40
msm_gem_vma_inuse(struct msm_gem_vma * vma)41 bool msm_gem_vma_inuse(struct msm_gem_vma *vma)
42 {
43 if (vma->inuse > 0)
44 return true;
45
46 while (vma->fence_mask) {
47 unsigned idx = ffs(vma->fence_mask) - 1;
48
49 if (!msm_fence_completed(vma->fctx[idx], vma->fence[idx]))
50 return true;
51
52 vma->fence_mask &= ~BIT(idx);
53 }
54
55 return false;
56 }
57
58 /* Actually unmap memory for the vma */
msm_gem_purge_vma(struct msm_gem_address_space * aspace,struct msm_gem_vma * vma)59 void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
60 struct msm_gem_vma *vma)
61 {
62 unsigned size = vma->node.size;
63
64 /* Print a message if we try to purge a vma in use */
65 GEM_WARN_ON(msm_gem_vma_inuse(vma));
66
67 /* Don't do anything if the memory isn't mapped */
68 if (!vma->mapped)
69 return;
70
71 if (aspace->mmu)
72 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size);
73
74 vma->mapped = false;
75 }
76
77 /* Remove reference counts for the mapping */
msm_gem_unpin_vma(struct msm_gem_vma * vma)78 void msm_gem_unpin_vma(struct msm_gem_vma *vma)
79 {
80 if (GEM_WARN_ON(!vma->inuse))
81 return;
82 if (!GEM_WARN_ON(!vma->iova))
83 vma->inuse--;
84 }
85
86 /* Replace pin reference with fence: */
msm_gem_unpin_vma_fenced(struct msm_gem_vma * vma,struct msm_fence_context * fctx)87 void msm_gem_unpin_vma_fenced(struct msm_gem_vma *vma, struct msm_fence_context *fctx)
88 {
89 vma->fctx[fctx->index] = fctx;
90 vma->fence[fctx->index] = fctx->last_fence;
91 vma->fence_mask |= BIT(fctx->index);
92 msm_gem_unpin_vma(vma);
93 }
94
95 /* Map and pin vma: */
96 int
msm_gem_map_vma(struct msm_gem_address_space * aspace,struct msm_gem_vma * vma,int prot,struct sg_table * sgt,int size)97 msm_gem_map_vma(struct msm_gem_address_space *aspace,
98 struct msm_gem_vma *vma, int prot,
99 struct sg_table *sgt, int size)
100 {
101 int ret = 0;
102
103 if (GEM_WARN_ON(!vma->iova))
104 return -EINVAL;
105
106 /* Increase the usage counter */
107 vma->inuse++;
108
109 if (vma->mapped)
110 return 0;
111
112 vma->mapped = true;
113
114 if (aspace && aspace->mmu)
115 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
116 size, prot);
117
118 if (ret) {
119 vma->mapped = false;
120 vma->inuse--;
121 }
122
123 return ret;
124 }
125
126 /* Close an iova. Warn if it is still in use */
msm_gem_close_vma(struct msm_gem_address_space * aspace,struct msm_gem_vma * vma)127 void msm_gem_close_vma(struct msm_gem_address_space *aspace,
128 struct msm_gem_vma *vma)
129 {
130 GEM_WARN_ON(msm_gem_vma_inuse(vma) || vma->mapped);
131
132 spin_lock(&aspace->lock);
133 if (vma->iova)
134 drm_mm_remove_node(&vma->node);
135 spin_unlock(&aspace->lock);
136
137 vma->iova = 0;
138
139 msm_gem_address_space_put(aspace);
140 }
141
142 /* Initialize a new vma and allocate an iova for it */
msm_gem_init_vma(struct msm_gem_address_space * aspace,struct msm_gem_vma * vma,int size,u64 range_start,u64 range_end)143 int msm_gem_init_vma(struct msm_gem_address_space *aspace,
144 struct msm_gem_vma *vma, int size,
145 u64 range_start, u64 range_end)
146 {
147 int ret;
148
149 if (GEM_WARN_ON(vma->iova))
150 return -EBUSY;
151
152 spin_lock(&aspace->lock);
153 ret = drm_mm_insert_node_in_range(&aspace->mm, &vma->node,
154 size, PAGE_SIZE, 0,
155 range_start, range_end, 0);
156 spin_unlock(&aspace->lock);
157
158 if (ret)
159 return ret;
160
161 vma->iova = vma->node.start;
162 vma->mapped = false;
163
164 kref_get(&aspace->kref);
165
166 return 0;
167 }
168
169 struct msm_gem_address_space *
msm_gem_address_space_create(struct msm_mmu * mmu,const char * name,u64 va_start,u64 size)170 msm_gem_address_space_create(struct msm_mmu *mmu, const char *name,
171 u64 va_start, u64 size)
172 {
173 struct msm_gem_address_space *aspace;
174
175 if (IS_ERR(mmu))
176 return ERR_CAST(mmu);
177
178 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
179 if (!aspace)
180 return ERR_PTR(-ENOMEM);
181
182 spin_lock_init(&aspace->lock);
183 aspace->name = name;
184 aspace->mmu = mmu;
185 aspace->va_start = va_start;
186 aspace->va_size = size;
187
188 drm_mm_init(&aspace->mm, va_start, size);
189
190 kref_init(&aspace->kref);
191
192 return aspace;
193 }
194