1 /*
2  * Copyright 2017 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  */
22 #include "nouveau_vmm.h"
23 #include "nouveau_drv.h"
24 #include "nouveau_bo.h"
25 #include "nouveau_mem.h"
26 
27 void
28 nouveau_vma_unmap(struct nouveau_vma *vma)
29 {
30 	if (vma->mem) {
31 		nvif_vmm_unmap(&vma->vmm->vmm, vma->addr);
32 		vma->mem = NULL;
33 	}
34 }
35 
36 int
37 nouveau_vma_map(struct nouveau_vma *vma, struct nouveau_mem *mem)
38 {
39 	struct nvif_vma tmp = { .addr = vma->addr };
40 	int ret = nouveau_mem_map(mem, &vma->vmm->vmm, &tmp);
41 	if (ret)
42 		return ret;
43 	vma->mem = mem;
44 	return 0;
45 }
46 
47 struct nouveau_vma *
48 nouveau_vma_find(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm)
49 {
50 	struct nouveau_vma *vma;
51 
52 	list_for_each_entry(vma, &nvbo->vma_list, head) {
53 		if (vma->vmm == vmm)
54 			return vma;
55 	}
56 
57 	return NULL;
58 }
59 
60 void
61 nouveau_vma_del(struct nouveau_vma **pvma)
62 {
63 	struct nouveau_vma *vma = *pvma;
64 	if (vma && --vma->refs <= 0) {
65 		if (likely(vma->addr != ~0ULL)) {
66 			struct nvif_vma tmp = { .addr = vma->addr, .size = 1 };
67 			nvif_vmm_put(&vma->vmm->vmm, &tmp);
68 		}
69 		list_del(&vma->head);
70 		kfree(*pvma);
71 		*pvma = NULL;
72 	}
73 }
74 
75 int
76 nouveau_vma_new(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm,
77 		struct nouveau_vma **pvma)
78 {
79 	struct nouveau_mem *mem = nouveau_mem(&nvbo->bo.mem);
80 	struct nouveau_vma *vma;
81 	struct nvif_vma tmp;
82 	int ret;
83 
84 	if ((vma = *pvma = nouveau_vma_find(nvbo, vmm))) {
85 		vma->refs++;
86 		return 0;
87 	}
88 
89 	if (!(vma = *pvma = kmalloc(sizeof(*vma), GFP_KERNEL)))
90 		return -ENOMEM;
91 	vma->vmm = vmm;
92 	vma->refs = 1;
93 	vma->addr = ~0ULL;
94 	vma->mem = NULL;
95 	vma->fence = NULL;
96 	list_add_tail(&vma->head, &nvbo->vma_list);
97 
98 	if (nvbo->bo.mem.mem_type != TTM_PL_SYSTEM &&
99 	    mem->mem.page == nvbo->page) {
100 		ret = nvif_vmm_get(&vmm->vmm, LAZY, false, mem->mem.page, 0,
101 				   mem->mem.size, &tmp);
102 		if (ret)
103 			goto done;
104 
105 		vma->addr = tmp.addr;
106 		ret = nouveau_vma_map(vma, mem);
107 	} else {
108 		ret = nvif_vmm_get(&vmm->vmm, PTES, false, mem->mem.page, 0,
109 				   mem->mem.size, &tmp);
110 		vma->addr = tmp.addr;
111 	}
112 
113 done:
114 	if (ret)
115 		nouveau_vma_del(pvma);
116 	return ret;
117 }
118 
119 void
120 nouveau_vmm_fini(struct nouveau_vmm *vmm)
121 {
122 	nvif_vmm_fini(&vmm->vmm);
123 	vmm->cli = NULL;
124 }
125 
126 int
127 nouveau_vmm_init(struct nouveau_cli *cli, s32 oclass, struct nouveau_vmm *vmm)
128 {
129 	int ret = nvif_vmm_init(&cli->mmu, oclass, PAGE_SIZE, 0, NULL, 0,
130 				&vmm->vmm);
131 	if (ret)
132 		return ret;
133 
134 	vmm->cli = cli;
135 	return 0;
136 }
137