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 <drm/drm_print.h> 30 31 #include "virtgpu_drv.h" 32 33 static int virtio_gpu_virglrenderer_workaround = 1; 34 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400); 35 36 int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid) 37 { 38 if (virtio_gpu_virglrenderer_workaround) { 39 /* 40 * Hack to avoid re-using resource IDs. 41 * 42 * virglrenderer versions up to (and including) 0.7.0 43 * can't deal with that. virglrenderer commit 44 * "f91a9dd35715 Fix unlinking resources from hash 45 * table." (Feb 2019) fixes the bug. 46 */ 47 static atomic_t seqno = ATOMIC_INIT(0); 48 int handle = atomic_inc_return(&seqno); 49 *resid = handle + 1; 50 } else { 51 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL); 52 53 if (handle < 0) 54 return handle; 55 *resid = handle + 1; 56 } 57 return 0; 58 } 59 60 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id) 61 { 62 if (!virtio_gpu_virglrenderer_workaround) 63 ida_free(&vgdev->resource_ida, id - 1); 64 } 65 66 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo) 67 { 68 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 69 70 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 71 if (virtio_gpu_is_shmem(bo)) { 72 drm_gem_shmem_free(&bo->base); 73 } else if (virtio_gpu_is_vram(bo)) { 74 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); 75 76 spin_lock(&vgdev->host_visible_lock); 77 if (drm_mm_node_allocated(&vram->vram_node)) 78 drm_mm_remove_node(&vram->vram_node); 79 80 spin_unlock(&vgdev->host_visible_lock); 81 82 drm_gem_free_mmap_offset(&vram->base.base.base); 83 drm_gem_object_release(&vram->base.base.base); 84 kfree(vram); 85 } else { 86 drm_gem_object_release(&bo->base.base); 87 kfree(bo); 88 } 89 } 90 91 static void virtio_gpu_free_object(struct drm_gem_object *obj) 92 { 93 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 94 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 95 96 if (bo->created) { 97 virtio_gpu_cmd_unref_resource(vgdev, bo); 98 virtio_gpu_notify(vgdev); 99 /* completion handler calls virtio_gpu_cleanup_object() */ 100 return; 101 } 102 virtio_gpu_cleanup_object(bo); 103 } 104 105 int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo) 106 { 107 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 108 struct virtio_gpu_fence *fence; 109 110 if (!bo->attached) 111 return 0; 112 113 fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0); 114 if (!fence) 115 return -ENOMEM; 116 117 virtio_gpu_object_detach(vgdev, bo, fence); 118 virtio_gpu_notify(vgdev); 119 120 dma_fence_wait(&fence->f, false); 121 dma_fence_put(&fence->f); 122 123 return 0; 124 } 125 126 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = { 127 .free = virtio_gpu_free_object, 128 .open = virtio_gpu_gem_object_open, 129 .close = virtio_gpu_gem_object_close, 130 .print_info = drm_gem_shmem_object_print_info, 131 .export = virtgpu_gem_prime_export, 132 .pin = drm_gem_shmem_object_pin, 133 .unpin = drm_gem_shmem_object_unpin, 134 .get_sg_table = drm_gem_shmem_object_get_sg_table, 135 .vmap = drm_gem_shmem_object_vmap, 136 .vunmap = drm_gem_shmem_object_vunmap, 137 .mmap = drm_gem_shmem_object_mmap, 138 .vm_ops = &drm_gem_shmem_vm_ops, 139 }; 140 141 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo) 142 { 143 return bo->base.base.funcs == &virtio_gpu_shmem_funcs; 144 } 145 146 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev, 147 size_t size) 148 { 149 struct virtio_gpu_object_shmem *shmem; 150 struct drm_gem_shmem_object *dshmem; 151 152 shmem = kzalloc_obj(*shmem, GFP_KERNEL); 153 if (!shmem) 154 return ERR_PTR(-ENOMEM); 155 156 dshmem = &shmem->base.base; 157 dshmem->base.funcs = &virtio_gpu_shmem_funcs; 158 return &dshmem->base; 159 } 160 161 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev, 162 struct virtio_gpu_object *bo, 163 struct virtio_gpu_mem_entry **ents, 164 unsigned int *nents) 165 { 166 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev); 167 struct scatterlist *sg; 168 struct sg_table *pages; 169 int si; 170 171 pages = drm_gem_shmem_get_pages_sgt(&bo->base); 172 if (IS_ERR(pages)) 173 return PTR_ERR(pages); 174 175 if (use_dma_api) 176 *nents = pages->nents; 177 else 178 *nents = pages->orig_nents; 179 180 *ents = kvmalloc_objs(struct virtio_gpu_mem_entry, *nents, GFP_KERNEL); 181 if (!(*ents)) { 182 DRM_ERROR("failed to allocate ent list\n"); 183 return -ENOMEM; 184 } 185 186 if (use_dma_api) { 187 for_each_sgtable_dma_sg(pages, sg, si) { 188 (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg)); 189 (*ents)[si].length = cpu_to_le32(sg_dma_len(sg)); 190 (*ents)[si].padding = 0; 191 } 192 } else { 193 for_each_sgtable_sg(pages, sg, si) { 194 (*ents)[si].addr = cpu_to_le64(sg_phys(sg)); 195 (*ents)[si].length = cpu_to_le32(sg->length); 196 (*ents)[si].padding = 0; 197 } 198 } 199 200 return 0; 201 } 202 203 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev, 204 struct virtio_gpu_object_params *params, 205 struct virtio_gpu_object **bo_ptr, 206 struct virtio_gpu_fence *fence) 207 { 208 struct virtio_gpu_object_array *objs = NULL; 209 struct drm_gem_shmem_object *shmem_obj; 210 struct virtio_gpu_object *bo; 211 struct virtio_gpu_mem_entry *ents = NULL; 212 unsigned int nents; 213 int ret; 214 215 *bo_ptr = NULL; 216 217 params->size = roundup(params->size, PAGE_SIZE); 218 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size); 219 if (IS_ERR(shmem_obj)) 220 return PTR_ERR(shmem_obj); 221 bo = gem_to_virtio_gpu_obj(&shmem_obj->base); 222 223 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle); 224 if (ret < 0) 225 goto err_free_gem; 226 227 bo->dumb = params->dumb; 228 229 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents); 230 if (ret != 0) 231 goto err_put_id; 232 233 if (fence) { 234 ret = -ENOMEM; 235 objs = virtio_gpu_array_alloc(1); 236 if (!objs) 237 goto err_free_entry; 238 virtio_gpu_array_add_obj(objs, &bo->base.base); 239 240 ret = virtio_gpu_array_lock_resv(objs); 241 if (ret != 0) 242 goto err_put_objs; 243 } 244 245 if (params->blob) { 246 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST) 247 bo->guest_blob = true; 248 249 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params, 250 ents, nents); 251 } else if (params->virgl) { 252 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, 253 objs, fence); 254 virtio_gpu_object_attach(vgdev, bo, ents, nents); 255 } else { 256 virtio_gpu_cmd_create_resource(vgdev, bo, params, 257 objs, fence); 258 virtio_gpu_object_attach(vgdev, bo, ents, nents); 259 } 260 261 *bo_ptr = bo; 262 return 0; 263 264 err_put_objs: 265 virtio_gpu_array_put_free(objs); 266 err_free_entry: 267 kvfree(ents); 268 err_put_id: 269 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 270 err_free_gem: 271 drm_gem_shmem_free(shmem_obj); 272 return ret; 273 } 274