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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 <drm/ttm/ttm_execbuf_util.h>
27
28#include "virtgpu_drv.h"
29
30static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
31 uint32_t *resid)
32{
33#if 0
34 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
35
36 if (handle < 0)
37 return handle;
38#else
39 static int handle;
40
41 /*
42 * FIXME: dirty hack to avoid re-using IDs, virglrenderer
43 * can't deal with that. Needs fixing in virglrenderer, also
44 * should figure a better way to handle that in the guest.
45 */
46 handle++;
47#endif
48
49 *resid = handle + 1;
50 return 0;
51}
52
53static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
54{
55#if 0
56 ida_free(&vgdev->resource_ida, id - 1);
57#endif
58}
59
60static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
61{
62 struct virtio_gpu_object *bo;
63 struct virtio_gpu_device *vgdev;
64
65 bo = container_of(tbo, struct virtio_gpu_object, tbo);
66 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
67
68 if (bo->created)
69 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
70 if (bo->pages)
71 virtio_gpu_object_free_sg_table(bo);
72 if (bo->vmap)
73 virtio_gpu_object_kunmap(bo);
74 drm_gem_object_release(&bo->gem_base);
75 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
76 kfree(bo);
77}
78
79static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo)
80{
81 u32 c = 1;
82
83 vgbo->placement.placement = &vgbo->placement_code;
84 vgbo->placement.busy_placement = &vgbo->placement_code;
85 vgbo->placement_code.fpfn = 0;
86 vgbo->placement_code.lpfn = 0;
87 vgbo->placement_code.flags =
88 TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT |
89 TTM_PL_FLAG_NO_EVICT;
90 vgbo->placement.num_placement = c;
91 vgbo->placement.num_busy_placement = c;
92
93}
94
95int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
96 struct virtio_gpu_object_params *params,
97 struct virtio_gpu_object **bo_ptr,
98 struct virtio_gpu_fence *fence)
99{
100 struct virtio_gpu_object *bo;
101 size_t acc_size;
102 int ret;
103
104 *bo_ptr = NULL;
105
106 acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, params->size,
107 sizeof(struct virtio_gpu_object));
108
109 bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
110 if (bo == NULL)
111 return -ENOMEM;
112 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
113 if (ret < 0) {
114 kfree(bo);
115 return ret;
116 }
117 params->size = roundup(params->size, PAGE_SIZE);
118 ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, params->size);
119 if (ret != 0) {
120 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
121 kfree(bo);
122 return ret;
123 }
124 bo->dumb = params->dumb;
125
126 if (params->virgl) {
127 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
128 } else {
129 virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
130 }
131
132 virtio_gpu_init_ttm_placement(bo);
133 ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, params->size,
134 ttm_bo_type_device, &bo->placement, 0,
135 true, acc_size, NULL, NULL,
136 &virtio_gpu_ttm_bo_destroy);
137 /* ttm_bo_init failure will call the destroy */
138 if (ret != 0)
139 return ret;
140
141 if (fence) {
142 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
143 struct list_head validate_list;
144 struct ttm_validate_buffer mainbuf;
145 struct ww_acquire_ctx ticket;
146 unsigned long irq_flags;
147 bool signaled;
148
149 INIT_LIST_HEAD(&validate_list);
150 memset(&mainbuf, 0, sizeof(struct ttm_validate_buffer));
151
152 /* use a gem reference since unref list undoes them */
153 drm_gem_object_get(&bo->gem_base);
154 mainbuf.bo = &bo->tbo;
155 list_add(&mainbuf.head, &validate_list);
156
157 ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
158 if (ret == 0) {
159 spin_lock_irqsave(&drv->lock, irq_flags);
160 signaled = virtio_fence_signaled(&fence->f);
161 if (!signaled)
162 /* virtio create command still in flight */
163 ttm_eu_fence_buffer_objects(&ticket, &validate_list,
164 &fence->f);
165 spin_unlock_irqrestore(&drv->lock, irq_flags);
166 if (signaled)
167 /* virtio create command finished */
168 ttm_eu_backoff_reservation(&ticket, &validate_list);
169 }
170 virtio_gpu_unref_list(&validate_list);
171 }
172
173 *bo_ptr = bo;
174 return 0;
175}
176
177void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
178{
179 bo->vmap = NULL;
180 ttm_bo_kunmap(&bo->kmap);
181}
182
183int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
184{
185 bool is_iomem;
186 int r;
187
188 WARN_ON(bo->vmap);
189
190 r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
191 if (r)
192 return r;
193 bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
194 return 0;
195}
196
197int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
198 struct virtio_gpu_object *bo)
199{
200 int ret;
201 struct page **pages = bo->tbo.ttm->pages;
202 int nr_pages = bo->tbo.num_pages;
203 struct ttm_operation_ctx ctx = {
204 .interruptible = false,
205 .no_wait_gpu = false
206 };
207 size_t max_segment;
208
209 /* wtf swapping */
210 if (bo->pages)
211 return 0;
212
213 if (bo->tbo.ttm->state == tt_unpopulated)
214 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
215 bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
216 if (!bo->pages)
217 goto out;
218
219 max_segment = virtio_max_dma_size(qdev->vdev);
220 max_segment &= PAGE_MASK;
221 if (max_segment > SCATTERLIST_MAX_SEGMENT)
222 max_segment = SCATTERLIST_MAX_SEGMENT;
223 ret = __sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
224 nr_pages << PAGE_SHIFT,
225 max_segment, GFP_KERNEL);
226 if (ret)
227 goto out;
228 return 0;
229out:
230 kfree(bo->pages);
231 bo->pages = NULL;
232 return -ENOMEM;
233}
234
235void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
236{
237 sg_free_table(bo->pages);
238 kfree(bo->pages);
239 bo->pages = NULL;
240}
241
242int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
243{
244 int r;
245
246 r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
247 if (unlikely(r != 0))
248 return r;
249 r = ttm_bo_wait(&bo->tbo, true, no_wait);
250 ttm_bo_unreserve(&bo->tbo);
251 return r;
252}
253
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 <linux/dma-mapping.h>
27#include <linux/moduleparam.h>
28
29#include "virtgpu_drv.h"
30
31static int virtio_gpu_virglrenderer_workaround = 1;
32module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
33
34int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
35{
36 if (virtio_gpu_virglrenderer_workaround) {
37 /*
38 * Hack to avoid re-using resource IDs.
39 *
40 * virglrenderer versions up to (and including) 0.7.0
41 * can't deal with that. virglrenderer commit
42 * "f91a9dd35715 Fix unlinking resources from hash
43 * table." (Feb 2019) fixes the bug.
44 */
45 static atomic_t seqno = ATOMIC_INIT(0);
46 int handle = atomic_inc_return(&seqno);
47 *resid = handle + 1;
48 } else {
49 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
50 if (handle < 0)
51 return handle;
52 *resid = handle + 1;
53 }
54 return 0;
55}
56
57static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
58{
59 if (!virtio_gpu_virglrenderer_workaround) {
60 ida_free(&vgdev->resource_ida, id - 1);
61 }
62}
63
64void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
65{
66 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
67
68 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
69 if (virtio_gpu_is_shmem(bo)) {
70 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
71
72 if (shmem->pages) {
73 if (shmem->mapped) {
74 dma_unmap_sgtable(vgdev->vdev->dev.parent,
75 shmem->pages, DMA_TO_DEVICE, 0);
76 shmem->mapped = 0;
77 }
78
79 sg_free_table(shmem->pages);
80 kfree(shmem->pages);
81 shmem->pages = NULL;
82 drm_gem_shmem_unpin(&bo->base.base);
83 }
84
85 drm_gem_shmem_free_object(&bo->base.base);
86 } else if (virtio_gpu_is_vram(bo)) {
87 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
88
89 spin_lock(&vgdev->host_visible_lock);
90 if (drm_mm_node_allocated(&vram->vram_node))
91 drm_mm_remove_node(&vram->vram_node);
92
93 spin_unlock(&vgdev->host_visible_lock);
94
95 drm_gem_free_mmap_offset(&vram->base.base.base);
96 drm_gem_object_release(&vram->base.base.base);
97 kfree(vram);
98 }
99}
100
101static void virtio_gpu_free_object(struct drm_gem_object *obj)
102{
103 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
104 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
105
106 if (bo->created) {
107 virtio_gpu_cmd_unref_resource(vgdev, bo);
108 virtio_gpu_notify(vgdev);
109 /* completion handler calls virtio_gpu_cleanup_object() */
110 return;
111 }
112 virtio_gpu_cleanup_object(bo);
113}
114
115static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
116 .free = virtio_gpu_free_object,
117 .open = virtio_gpu_gem_object_open,
118 .close = virtio_gpu_gem_object_close,
119
120 .print_info = drm_gem_shmem_print_info,
121 .export = virtgpu_gem_prime_export,
122 .pin = drm_gem_shmem_pin,
123 .unpin = drm_gem_shmem_unpin,
124 .get_sg_table = drm_gem_shmem_get_sg_table,
125 .vmap = drm_gem_shmem_vmap,
126 .vunmap = drm_gem_shmem_vunmap,
127 .mmap = drm_gem_shmem_mmap,
128};
129
130bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
131{
132 return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
133}
134
135struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
136 size_t size)
137{
138 struct virtio_gpu_object_shmem *shmem;
139 struct drm_gem_shmem_object *dshmem;
140
141 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
142 if (!shmem)
143 return NULL;
144
145 dshmem = &shmem->base.base;
146 dshmem->base.funcs = &virtio_gpu_shmem_funcs;
147 return &dshmem->base;
148}
149
150static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
151 struct virtio_gpu_object *bo,
152 struct virtio_gpu_mem_entry **ents,
153 unsigned int *nents)
154{
155 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
156 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
157 struct scatterlist *sg;
158 int si, ret;
159
160 ret = drm_gem_shmem_pin(&bo->base.base);
161 if (ret < 0)
162 return -EINVAL;
163
164 /*
165 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
166 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
167 * dma-ops. This is discouraged for other drivers, but should be fine
168 * since virtio_gpu doesn't support dma-buf import from other devices.
169 */
170 shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
171 if (!shmem->pages) {
172 drm_gem_shmem_unpin(&bo->base.base);
173 return -EINVAL;
174 }
175
176 if (use_dma_api) {
177 ret = dma_map_sgtable(vgdev->vdev->dev.parent,
178 shmem->pages, DMA_TO_DEVICE, 0);
179 if (ret)
180 return ret;
181 *nents = shmem->mapped = shmem->pages->nents;
182 } else {
183 *nents = shmem->pages->orig_nents;
184 }
185
186 *ents = kvmalloc_array(*nents,
187 sizeof(struct virtio_gpu_mem_entry),
188 GFP_KERNEL);
189 if (!(*ents)) {
190 DRM_ERROR("failed to allocate ent list\n");
191 return -ENOMEM;
192 }
193
194 if (use_dma_api) {
195 for_each_sgtable_dma_sg(shmem->pages, sg, si) {
196 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
197 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
198 (*ents)[si].padding = 0;
199 }
200 } else {
201 for_each_sgtable_sg(shmem->pages, sg, si) {
202 (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
203 (*ents)[si].length = cpu_to_le32(sg->length);
204 (*ents)[si].padding = 0;
205 }
206 }
207
208 return 0;
209}
210
211int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
212 struct virtio_gpu_object_params *params,
213 struct virtio_gpu_object **bo_ptr,
214 struct virtio_gpu_fence *fence)
215{
216 struct virtio_gpu_object_array *objs = NULL;
217 struct drm_gem_shmem_object *shmem_obj;
218 struct virtio_gpu_object *bo;
219 struct virtio_gpu_mem_entry *ents;
220 unsigned int nents;
221 int ret;
222
223 *bo_ptr = NULL;
224
225 params->size = roundup(params->size, PAGE_SIZE);
226 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
227 if (IS_ERR(shmem_obj))
228 return PTR_ERR(shmem_obj);
229 bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
230
231 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
232 if (ret < 0)
233 goto err_free_gem;
234
235 bo->dumb = params->dumb;
236
237 if (fence) {
238 ret = -ENOMEM;
239 objs = virtio_gpu_array_alloc(1);
240 if (!objs)
241 goto err_put_id;
242 virtio_gpu_array_add_obj(objs, &bo->base.base);
243
244 ret = virtio_gpu_array_lock_resv(objs);
245 if (ret != 0)
246 goto err_put_objs;
247 }
248
249 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
250 if (ret != 0) {
251 virtio_gpu_array_put_free(objs);
252 virtio_gpu_free_object(&shmem_obj->base);
253 return ret;
254 }
255
256 if (params->blob) {
257 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
258 bo->guest_blob = true;
259
260 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
261 ents, nents);
262 } else if (params->virgl) {
263 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
264 objs, fence);
265 virtio_gpu_object_attach(vgdev, bo, ents, nents);
266 } else {
267 virtio_gpu_cmd_create_resource(vgdev, bo, params,
268 objs, fence);
269 virtio_gpu_object_attach(vgdev, bo, ents, nents);
270 }
271
272 *bo_ptr = bo;
273 return 0;
274
275err_put_objs:
276 virtio_gpu_array_put_free(objs);
277err_put_id:
278 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
279err_free_gem:
280 drm_gem_shmem_free_object(&shmem_obj->base);
281 return ret;
282}