Merge tag 'drm-intel-next-2018-12-04' of git://anongit.freedesktop.org/drm/drm-intel...
[sfrench/cifs-2.6.git] / drivers / gpu / drm / virtio / virtgpu_object.c
1 /*
2  * Copyright (C) 2015 Red Hat, Inc.
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining
6  * a copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sublicense, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * The above copyright notice and this permission notice (including the
14  * next paragraph) shall be included in all copies or substantial
15  * portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24  */
25
26 #include "virtgpu_drv.h"
27
28 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
29                                        uint32_t *resid)
30 {
31         int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
32
33         if (handle < 0)
34                 return handle;
35
36         *resid = handle + 1;
37         return 0;
38 }
39
40 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
41 {
42         ida_free(&vgdev->resource_ida, id - 1);
43 }
44
45 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
46 {
47         struct virtio_gpu_object *bo;
48         struct virtio_gpu_device *vgdev;
49
50         bo = container_of(tbo, struct virtio_gpu_object, tbo);
51         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
52
53         if (bo->created)
54                 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
55         if (bo->pages)
56                 virtio_gpu_object_free_sg_table(bo);
57         if (bo->vmap)
58                 virtio_gpu_object_kunmap(bo);
59         drm_gem_object_release(&bo->gem_base);
60         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
61         kfree(bo);
62 }
63
64 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
65                                           bool pinned)
66 {
67         u32 c = 1;
68         u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
69
70         vgbo->placement.placement = &vgbo->placement_code;
71         vgbo->placement.busy_placement = &vgbo->placement_code;
72         vgbo->placement_code.fpfn = 0;
73         vgbo->placement_code.lpfn = 0;
74         vgbo->placement_code.flags =
75                 TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
76         vgbo->placement.num_placement = c;
77         vgbo->placement.num_busy_placement = c;
78
79 }
80
81 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
82                              unsigned long size, bool kernel, bool pinned,
83                              struct virtio_gpu_object **bo_ptr)
84 {
85         struct virtio_gpu_object *bo;
86         enum ttm_bo_type type;
87         size_t acc_size;
88         int ret;
89
90         if (kernel)
91                 type = ttm_bo_type_kernel;
92         else
93                 type = ttm_bo_type_device;
94         *bo_ptr = NULL;
95
96         acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
97                                        sizeof(struct virtio_gpu_object));
98
99         bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
100         if (bo == NULL)
101                 return -ENOMEM;
102         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
103         if (ret < 0) {
104                 kfree(bo);
105                 return ret;
106         }
107         size = roundup(size, PAGE_SIZE);
108         ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
109         if (ret != 0) {
110                 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
111                 kfree(bo);
112                 return ret;
113         }
114         bo->dumb = false;
115         virtio_gpu_init_ttm_placement(bo, pinned);
116
117         ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
118                           &bo->placement, 0, !kernel, acc_size,
119                           NULL, NULL, &virtio_gpu_ttm_bo_destroy);
120         /* ttm_bo_init failure will call the destroy */
121         if (ret != 0)
122                 return ret;
123
124         *bo_ptr = bo;
125         return 0;
126 }
127
128 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
129 {
130         bo->vmap = NULL;
131         ttm_bo_kunmap(&bo->kmap);
132 }
133
134 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
135 {
136         bool is_iomem;
137         int r;
138
139         WARN_ON(bo->vmap);
140
141         r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
142         if (r)
143                 return r;
144         bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
145         return 0;
146 }
147
148 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
149                                    struct virtio_gpu_object *bo)
150 {
151         int ret;
152         struct page **pages = bo->tbo.ttm->pages;
153         int nr_pages = bo->tbo.num_pages;
154         struct ttm_operation_ctx ctx = {
155                 .interruptible = false,
156                 .no_wait_gpu = false
157         };
158
159         /* wtf swapping */
160         if (bo->pages)
161                 return 0;
162
163         if (bo->tbo.ttm->state == tt_unpopulated)
164                 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
165         bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
166         if (!bo->pages)
167                 goto out;
168
169         ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
170                                         nr_pages << PAGE_SHIFT, GFP_KERNEL);
171         if (ret)
172                 goto out;
173         return 0;
174 out:
175         kfree(bo->pages);
176         bo->pages = NULL;
177         return -ENOMEM;
178 }
179
180 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
181 {
182         sg_free_table(bo->pages);
183         kfree(bo->pages);
184         bo->pages = NULL;
185 }
186
187 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
188 {
189         int r;
190
191         r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
192         if (unlikely(r != 0))
193                 return r;
194         r = ttm_bo_wait(&bo->tbo, true, no_wait);
195         ttm_bo_unreserve(&bo->tbo);
196         return r;
197 }
198