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667ce33e RC |
1 | /* |
2 | * Copyright (C) 2016 Red Hat | |
3 | * Author: Rob Clark <robdclark@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include "msm_drv.h" | |
19 | #include "msm_gem.h" | |
20 | #include "msm_mmu.h" | |
21 | ||
ee546cd3 JC |
22 | static void |
23 | msm_gem_address_space_destroy(struct kref *kref) | |
24 | { | |
25 | struct msm_gem_address_space *aspace = container_of(kref, | |
26 | struct msm_gem_address_space, kref); | |
27 | ||
28 | drm_mm_takedown(&aspace->mm); | |
29 | if (aspace->mmu) | |
30 | aspace->mmu->funcs->destroy(aspace->mmu); | |
31 | kfree(aspace); | |
32 | } | |
33 | ||
34 | ||
35 | void msm_gem_address_space_put(struct msm_gem_address_space *aspace) | |
36 | { | |
37 | if (aspace) | |
38 | kref_put(&aspace->kref, msm_gem_address_space_destroy); | |
39 | } | |
40 | ||
667ce33e RC |
41 | void |
42 | msm_gem_unmap_vma(struct msm_gem_address_space *aspace, | |
43 | struct msm_gem_vma *vma, struct sg_table *sgt) | |
44 | { | |
45 | if (!vma->iova) | |
46 | return; | |
47 | ||
48 | if (aspace->mmu) { | |
49 | unsigned size = vma->node.size << PAGE_SHIFT; | |
50 | aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, size); | |
51 | } | |
52 | ||
0e08270a | 53 | spin_lock(&aspace->lock); |
667ce33e | 54 | drm_mm_remove_node(&vma->node); |
0e08270a | 55 | spin_unlock(&aspace->lock); |
667ce33e RC |
56 | |
57 | vma->iova = 0; | |
ee546cd3 JC |
58 | |
59 | msm_gem_address_space_put(aspace); | |
667ce33e RC |
60 | } |
61 | ||
62 | int | |
63 | msm_gem_map_vma(struct msm_gem_address_space *aspace, | |
64 | struct msm_gem_vma *vma, struct sg_table *sgt, int npages) | |
65 | { | |
66 | int ret; | |
67 | ||
0e08270a SS |
68 | spin_lock(&aspace->lock); |
69 | if (WARN_ON(drm_mm_node_allocated(&vma->node))) { | |
70 | spin_unlock(&aspace->lock); | |
667ce33e | 71 | return 0; |
0e08270a | 72 | } |
667ce33e | 73 | |
4e64e553 | 74 | ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages); |
0e08270a SS |
75 | spin_unlock(&aspace->lock); |
76 | ||
667ce33e RC |
77 | if (ret) |
78 | return ret; | |
79 | ||
80 | vma->iova = vma->node.start << PAGE_SHIFT; | |
81 | ||
82 | if (aspace->mmu) { | |
83 | unsigned size = npages << PAGE_SHIFT; | |
84 | ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt, | |
85 | size, IOMMU_READ | IOMMU_WRITE); | |
86 | } | |
87 | ||
ee546cd3 JC |
88 | /* Get a reference to the aspace to keep it around */ |
89 | kref_get(&aspace->kref); | |
667ce33e | 90 | |
ee546cd3 | 91 | return ret; |
667ce33e RC |
92 | } |
93 | ||
94 | struct msm_gem_address_space * | |
95 | msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain, | |
96 | const char *name) | |
97 | { | |
98 | struct msm_gem_address_space *aspace; | |
99 | ||
100 | aspace = kzalloc(sizeof(*aspace), GFP_KERNEL); | |
101 | if (!aspace) | |
102 | return ERR_PTR(-ENOMEM); | |
103 | ||
0e08270a | 104 | spin_lock_init(&aspace->lock); |
667ce33e RC |
105 | aspace->name = name; |
106 | aspace->mmu = msm_iommu_new(dev, domain); | |
107 | ||
108 | drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT), | |
109 | (domain->geometry.aperture_end >> PAGE_SHIFT) - 1); | |
110 | ||
ee546cd3 JC |
111 | kref_init(&aspace->kref); |
112 | ||
667ce33e RC |
113 | return aspace; |
114 | } |