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_svm.h"
26#include "nouveau_mem.h"
27
28void
29nouveau_vma_unmap(struct nouveau_vma *vma)
30{
31	if (vma->mem) {
32		nvif_vmm_unmap(&vma->vmm->vmm, vma->addr);
33		vma->mem = NULL;
34	}
35}
36
37int
38nouveau_vma_map(struct nouveau_vma *vma, struct nouveau_mem *mem)
39{
40	struct nvif_vma tmp = { .addr = vma->addr };
41	int ret = nouveau_mem_map(mem, &vma->vmm->vmm, &tmp);
42	if (ret)
43		return ret;
44	vma->mem = mem;
45	return 0;
46}
47
48struct nouveau_vma *
49nouveau_vma_find(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm)
50{
51	struct nouveau_vma *vma;
52
53	list_for_each_entry(vma, &nvbo->vma_list, head) {
54		if (vma->vmm == vmm)
55			return vma;
56	}
57
58	return NULL;
59}
60
61void
62nouveau_vma_del(struct nouveau_vma **pvma)
63{
64	struct nouveau_vma *vma = *pvma;
65	if (vma && --vma->refs <= 0) {
66		if (likely(vma->addr != ~0ULL)) {
67			struct nvif_vma tmp = { .addr = vma->addr, .size = 1 };
68			nvif_vmm_put(&vma->vmm->vmm, &tmp);
69		}
70		list_del(&vma->head);
71		kfree(*pvma);
72	}
73	*pvma = NULL;
74}
75
76int
77nouveau_vma_new(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm,
78		struct nouveau_vma **pvma)
79{
80	struct nouveau_mem *mem = nouveau_mem(nvbo->bo.resource);
81	struct nouveau_vma *vma;
82	struct nvif_vma tmp;
83	int ret;
84
85	if ((vma = *pvma = nouveau_vma_find(nvbo, vmm))) {
86		vma->refs++;
87		return 0;
88	}
89
90	if (!(vma = *pvma = kmalloc(sizeof(*vma), GFP_KERNEL)))
91		return -ENOMEM;
92	vma->vmm = vmm;
93	vma->refs = 1;
94	vma->addr = ~0ULL;
95	vma->mem = NULL;
96	vma->fence = NULL;
97	list_add_tail(&vma->head, &nvbo->vma_list);
98
99	if (nvbo->bo.resource->mem_type != TTM_PL_SYSTEM &&
100	    mem->mem.page == nvbo->page) {
101		ret = nvif_vmm_get(&vmm->vmm, LAZY, false, mem->mem.page, 0,
102				   mem->mem.size, &tmp);
103		if (ret)
104			goto done;
105
106		vma->addr = tmp.addr;
107		ret = nouveau_vma_map(vma, mem);
108	} else {
109		ret = nvif_vmm_get(&vmm->vmm, PTES, false, mem->mem.page, 0,
110				   mem->mem.size, &tmp);
111		if (ret)
112			goto done;
113
114		vma->addr = tmp.addr;
115	}
116
117done:
118	if (ret)
119		nouveau_vma_del(pvma);
120	return ret;
121}
122
123void
124nouveau_vmm_fini(struct nouveau_vmm *vmm)
125{
126	nouveau_svmm_fini(&vmm->svmm);
127	nvif_vmm_dtor(&vmm->vmm);
128	vmm->cli = NULL;
129}
130
131int
132nouveau_vmm_init(struct nouveau_cli *cli, s32 oclass, struct nouveau_vmm *vmm)
133{
134	int ret = nvif_vmm_ctor(&cli->mmu, "drmVmm", oclass, UNMANAGED,
135				PAGE_SIZE, 0, NULL, 0, &vmm->vmm);
136	if (ret)
137		return ret;
138
139	vmm->cli = cli;
140	return 0;
141}
142