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 31 static int virtio_gpu_virglrenderer_workaround = 1; 32 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400); 33 34 int 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 57 static 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 64 void 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); 83 } 84 85 drm_gem_shmem_free(&bo->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 } 100 101 static 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 } 114 115 static 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 .print_info = drm_gem_shmem_object_print_info, 120 .export = virtgpu_gem_prime_export, 121 .pin = drm_gem_shmem_object_pin, 122 .unpin = drm_gem_shmem_object_unpin, 123 .get_sg_table = drm_gem_shmem_object_get_sg_table, 124 .vmap = drm_gem_shmem_object_vmap, 125 .vunmap = drm_gem_shmem_object_vunmap, 126 .mmap = drm_gem_shmem_object_mmap, 127 .vm_ops = &drm_gem_shmem_vm_ops, 128 }; 129 130 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo) 131 { 132 return bo->base.base.funcs == &virtio_gpu_shmem_funcs; 133 } 134 135 struct 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 ERR_PTR(-ENOMEM); 144 145 dshmem = &shmem->base.base; 146 dshmem->base.funcs = &virtio_gpu_shmem_funcs; 147 return &dshmem->base; 148 } 149 150 static 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); 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); 171 if (!shmem->pages) { 172 drm_gem_shmem_unpin(&bo->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 } 210 211 int 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; 274 275 err_put_objs: 276 virtio_gpu_array_put_free(objs); 277 err_put_id: 278 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 279 err_free_gem: 280 drm_gem_shmem_free(shmem_obj); 281 return ret; 282 } 283