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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/gpu/drm/virtio/virtgpu_object.c
....@@ -23,9 +23,8 @@
2323  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
2424  */
2525 
26
+#include <linux/dma-mapping.h>
2627 #include <linux/moduleparam.h>
27
-
28
-#include <drm/ttm/ttm_execbuf_util.h>
2928 
3029 #include "virtgpu_drv.h"
3130 
....@@ -63,37 +62,139 @@
6362 	}
6463 }
6564 
66
-static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
65
+void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
6766 {
68
-	struct virtio_gpu_object *bo;
69
-	struct virtio_gpu_device *vgdev;
67
+	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
7068 
71
-	bo = container_of(tbo, struct virtio_gpu_object, tbo);
72
-	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
73
-
74
-	if (bo->created)
75
-		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
76
-	if (bo->pages)
77
-		virtio_gpu_object_free_sg_table(bo);
78
-	drm_gem_object_release(&bo->gem_base);
7969 	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
80
-	kfree(bo);
70
+	if (virtio_gpu_is_shmem(bo)) {
71
+		struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
72
+
73
+		if (shmem->pages) {
74
+			if (shmem->mapped) {
75
+				dma_unmap_sgtable(vgdev->vdev->dev.parent,
76
+					     shmem->pages, DMA_TO_DEVICE, 0);
77
+				shmem->mapped = 0;
78
+			}
79
+
80
+			sg_free_table(shmem->pages);
81
+			kfree(shmem->pages);
82
+			shmem->pages = NULL;
83
+			drm_gem_shmem_unpin(&bo->base.base);
84
+		}
85
+
86
+		drm_gem_shmem_free_object(&bo->base.base);
87
+	}
8188 }
8289 
83
-static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo)
90
+static void virtio_gpu_free_object(struct drm_gem_object *obj)
8491 {
85
-	u32 c = 1;
92
+	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
93
+	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
8694 
87
-	vgbo->placement.placement = &vgbo->placement_code;
88
-	vgbo->placement.busy_placement = &vgbo->placement_code;
89
-	vgbo->placement_code.fpfn = 0;
90
-	vgbo->placement_code.lpfn = 0;
91
-	vgbo->placement_code.flags =
92
-		TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT |
93
-		TTM_PL_FLAG_NO_EVICT;
94
-	vgbo->placement.num_placement = c;
95
-	vgbo->placement.num_busy_placement = c;
95
+	if (bo->created) {
96
+		virtio_gpu_cmd_unref_resource(vgdev, bo);
97
+		virtio_gpu_notify(vgdev);
98
+		/* completion handler calls virtio_gpu_cleanup_object() */
99
+		return;
100
+	}
101
+	virtio_gpu_cleanup_object(bo);
102
+}
96103 
104
+static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
105
+	.free = virtio_gpu_free_object,
106
+	.open = virtio_gpu_gem_object_open,
107
+	.close = virtio_gpu_gem_object_close,
108
+
109
+	.print_info = drm_gem_shmem_print_info,
110
+	.pin = drm_gem_shmem_pin,
111
+	.unpin = drm_gem_shmem_unpin,
112
+	.get_sg_table = drm_gem_shmem_get_sg_table,
113
+	.vmap = drm_gem_shmem_vmap,
114
+	.vunmap = drm_gem_shmem_vunmap,
115
+	.mmap = drm_gem_shmem_mmap,
116
+};
117
+
118
+bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
119
+{
120
+	return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
121
+}
122
+
123
+struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
124
+						size_t size)
125
+{
126
+	struct virtio_gpu_object_shmem *shmem;
127
+	struct drm_gem_shmem_object *dshmem;
128
+
129
+	shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
130
+	if (!shmem)
131
+		return NULL;
132
+
133
+	dshmem = &shmem->base.base;
134
+	dshmem->base.funcs = &virtio_gpu_shmem_funcs;
135
+	dshmem->map_cached = true;
136
+	return &dshmem->base;
137
+}
138
+
139
+static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
140
+					struct virtio_gpu_object *bo,
141
+					struct virtio_gpu_mem_entry **ents,
142
+					unsigned int *nents)
143
+{
144
+	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
145
+	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
146
+	struct scatterlist *sg;
147
+	int si, ret;
148
+
149
+	ret = drm_gem_shmem_pin(&bo->base.base);
150
+	if (ret < 0)
151
+		return -EINVAL;
152
+
153
+	/*
154
+	 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
155
+	 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
156
+	 * dma-ops. This is discouraged for other drivers, but should be fine
157
+	 * since virtio_gpu doesn't support dma-buf import from other devices.
158
+	 */
159
+	shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
160
+	if (!shmem->pages) {
161
+		drm_gem_shmem_unpin(&bo->base.base);
162
+		return -EINVAL;
163
+	}
164
+
165
+	if (use_dma_api) {
166
+		ret = dma_map_sgtable(vgdev->vdev->dev.parent,
167
+				      shmem->pages, DMA_TO_DEVICE, 0);
168
+		if (ret)
169
+			return ret;
170
+		*nents = shmem->mapped = shmem->pages->nents;
171
+	} else {
172
+		*nents = shmem->pages->orig_nents;
173
+	}
174
+
175
+	*ents = kvmalloc_array(*nents,
176
+			       sizeof(struct virtio_gpu_mem_entry),
177
+			       GFP_KERNEL);
178
+	if (!(*ents)) {
179
+		DRM_ERROR("failed to allocate ent list\n");
180
+		return -ENOMEM;
181
+	}
182
+
183
+	if (use_dma_api) {
184
+		for_each_sgtable_dma_sg(shmem->pages, sg, si) {
185
+			(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
186
+			(*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
187
+			(*ents)[si].padding = 0;
188
+		}
189
+	} else {
190
+		for_each_sgtable_sg(shmem->pages, sg, si) {
191
+			(*ents)[si].addr = cpu_to_le64(sg_phys(sg));
192
+			(*ents)[si].length = cpu_to_le32(sg->length);
193
+			(*ents)[si].padding = 0;
194
+		}
195
+	}
196
+
197
+	return 0;
97198 }
98199 
99200 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
....@@ -101,151 +202,63 @@
101202 			     struct virtio_gpu_object **bo_ptr,
102203 			     struct virtio_gpu_fence *fence)
103204 {
205
+	struct virtio_gpu_object_array *objs = NULL;
206
+	struct drm_gem_shmem_object *shmem_obj;
104207 	struct virtio_gpu_object *bo;
105
-	size_t acc_size;
208
+	struct virtio_gpu_mem_entry *ents;
209
+	unsigned int nents;
106210 	int ret;
107211 
108212 	*bo_ptr = NULL;
109213 
110
-	acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, params->size,
111
-				       sizeof(struct virtio_gpu_object));
112
-
113
-	bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
114
-	if (bo == NULL)
115
-		return -ENOMEM;
116
-	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
117
-	if (ret < 0) {
118
-		kfree(bo);
119
-		return ret;
120
-	}
121214 	params->size = roundup(params->size, PAGE_SIZE);
122
-	ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, params->size);
123
-	if (ret != 0) {
124
-		virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
125
-		kfree(bo);
126
-		return ret;
127
-	}
215
+	shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
216
+	if (IS_ERR(shmem_obj))
217
+		return PTR_ERR(shmem_obj);
218
+	bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
219
+
220
+	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
221
+	if (ret < 0)
222
+		goto err_free_gem;
223
+
128224 	bo->dumb = params->dumb;
129225 
130
-	if (params->virgl) {
131
-		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
132
-	} else {
133
-		virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
134
-	}
135
-
136
-	virtio_gpu_init_ttm_placement(bo);
137
-	ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, params->size,
138
-			  ttm_bo_type_device, &bo->placement, 0,
139
-			  true, acc_size, NULL, NULL,
140
-			  &virtio_gpu_ttm_bo_destroy);
141
-	/* ttm_bo_init failure will call the destroy */
142
-	if (ret != 0)
143
-		return ret;
144
-
145226 	if (fence) {
146
-		struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
147
-		struct list_head validate_list;
148
-		struct ttm_validate_buffer mainbuf;
149
-		struct ww_acquire_ctx ticket;
150
-		unsigned long irq_flags;
151
-		bool signaled;
227
+		ret = -ENOMEM;
228
+		objs = virtio_gpu_array_alloc(1);
229
+		if (!objs)
230
+			goto err_put_id;
231
+		virtio_gpu_array_add_obj(objs, &bo->base.base);
152232 
153
-		INIT_LIST_HEAD(&validate_list);
154
-		memset(&mainbuf, 0, sizeof(struct ttm_validate_buffer));
155
-
156
-		/* use a gem reference since unref list undoes them */
157
-		drm_gem_object_get(&bo->gem_base);
158
-		mainbuf.bo = &bo->tbo;
159
-		list_add(&mainbuf.head, &validate_list);
160
-
161
-		ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
162
-		if (ret == 0) {
163
-			spin_lock_irqsave(&drv->lock, irq_flags);
164
-			signaled = virtio_fence_signaled(&fence->f);
165
-			if (!signaled)
166
-				/* virtio create command still in flight */
167
-				ttm_eu_fence_buffer_objects(&ticket, &validate_list,
168
-							    &fence->f);
169
-			spin_unlock_irqrestore(&drv->lock, irq_flags);
170
-			if (signaled)
171
-				/* virtio create command finished */
172
-				ttm_eu_backoff_reservation(&ticket, &validate_list);
173
-		}
174
-		virtio_gpu_unref_list(&validate_list);
233
+		ret = virtio_gpu_array_lock_resv(objs);
234
+		if (ret != 0)
235
+			goto err_put_objs;
175236 	}
237
+
238
+	if (params->virgl) {
239
+		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
240
+						  objs, fence);
241
+	} else {
242
+		virtio_gpu_cmd_create_resource(vgdev, bo, params,
243
+					       objs, fence);
244
+	}
245
+
246
+	ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
247
+	if (ret != 0) {
248
+		virtio_gpu_free_object(&shmem_obj->base);
249
+		return ret;
250
+	}
251
+
252
+	virtio_gpu_object_attach(vgdev, bo, ents, nents);
176253 
177254 	*bo_ptr = bo;
178255 	return 0;
256
+
257
+err_put_objs:
258
+	virtio_gpu_array_put_free(objs);
259
+err_put_id:
260
+	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
261
+err_free_gem:
262
+	drm_gem_shmem_free_object(&shmem_obj->base);
263
+	return ret;
179264 }
180
-
181
-void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
182
-{
183
-	bo->vmap = NULL;
184
-	ttm_bo_kunmap(&bo->kmap);
185
-}
186
-
187
-int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
188
-{
189
-	bool is_iomem;
190
-	int r;
191
-
192
-	WARN_ON(bo->vmap);
193
-
194
-	r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
195
-	if (r)
196
-		return r;
197
-	bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
198
-	return 0;
199
-}
200
-
201
-int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
202
-				   struct virtio_gpu_object *bo)
203
-{
204
-	int ret;
205
-	struct page **pages = bo->tbo.ttm->pages;
206
-	int nr_pages = bo->tbo.num_pages;
207
-	struct ttm_operation_ctx ctx = {
208
-		.interruptible = false,
209
-		.no_wait_gpu = false
210
-	};
211
-
212
-	/* wtf swapping */
213
-	if (bo->pages)
214
-		return 0;
215
-
216
-	if (bo->tbo.ttm->state == tt_unpopulated)
217
-		bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
218
-	bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
219
-	if (!bo->pages)
220
-		goto out;
221
-
222
-	ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
223
-					nr_pages << PAGE_SHIFT, GFP_KERNEL);
224
-	if (ret)
225
-		goto out;
226
-	return 0;
227
-out:
228
-	kfree(bo->pages);
229
-	bo->pages = NULL;
230
-	return -ENOMEM;
231
-}
232
-
233
-void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
234
-{
235
-	sg_free_table(bo->pages);
236
-	kfree(bo->pages);
237
-	bo->pages = NULL;
238
-}
239
-
240
-int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
241
-{
242
-	int r;
243
-
244
-	r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
245
-	if (unlikely(r != 0))
246
-		return r;
247
-	r = ttm_bo_wait(&bo->tbo, true, no_wait);
248
-	ttm_bo_unreserve(&bo->tbo);
249
-	return r;
250
-}
251
-