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 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, 35 uint32_t *resid) 36 { 37 if (virtio_gpu_virglrenderer_workaround) { 38 /* 39 * Hack to avoid re-using resource IDs. 40 * 41 * virglrenderer versions up to (and including) 0.7.0 42 * can't deal with that. virglrenderer commit 43 * "f91a9dd35715 Fix unlinking resources from hash 44 * table." (Feb 2019) fixes the bug. 45 */ 46 static int handle; 47 handle++; 48 *resid = handle + 1; 49 } else { 50 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL); 51 if (handle < 0) 52 return handle; 53 *resid = handle + 1; 54 } 55 return 0; 56 } 57 58 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id) 59 { 60 if (!virtio_gpu_virglrenderer_workaround) { 61 ida_free(&vgdev->resource_ida, id - 1); 62 } 63 } 64 65 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo) 66 { 67 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 68 69 if (bo->pages) { 70 if (bo->mapped) { 71 dma_unmap_sg(vgdev->vdev->dev.parent, 72 bo->pages->sgl, bo->mapped, 73 DMA_TO_DEVICE); 74 bo->mapped = 0; 75 } 76 sg_free_table(bo->pages); 77 bo->pages = NULL; 78 drm_gem_shmem_unpin(&bo->base.base); 79 } 80 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 81 drm_gem_shmem_free_object(&bo->base.base); 82 } 83 84 static void virtio_gpu_free_object(struct drm_gem_object *obj) 85 { 86 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 87 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 88 89 if (bo->created) { 90 virtio_gpu_cmd_unref_resource(vgdev, bo); 91 virtio_gpu_notify(vgdev); 92 /* completion handler calls virtio_gpu_cleanup_object() */ 93 return; 94 } 95 virtio_gpu_cleanup_object(bo); 96 } 97 98 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = { 99 .free = virtio_gpu_free_object, 100 .open = virtio_gpu_gem_object_open, 101 .close = virtio_gpu_gem_object_close, 102 103 .print_info = drm_gem_shmem_print_info, 104 .pin = drm_gem_shmem_pin, 105 .unpin = drm_gem_shmem_unpin, 106 .get_sg_table = drm_gem_shmem_get_sg_table, 107 .vmap = drm_gem_shmem_vmap, 108 .vunmap = drm_gem_shmem_vunmap, 109 .mmap = drm_gem_shmem_mmap, 110 }; 111 112 bool virtio_gpu_is_shmem(struct drm_gem_object *obj) 113 { 114 return obj->funcs == &virtio_gpu_shmem_funcs; 115 } 116 117 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev, 118 size_t size) 119 { 120 struct virtio_gpu_object *bo; 121 122 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 123 if (!bo) 124 return NULL; 125 126 bo->base.base.funcs = &virtio_gpu_shmem_funcs; 127 return &bo->base.base; 128 } 129 130 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev, 131 struct virtio_gpu_object *bo, 132 struct virtio_gpu_mem_entry **ents, 133 unsigned int *nents) 134 { 135 bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev); 136 struct scatterlist *sg; 137 int si, ret; 138 139 ret = drm_gem_shmem_pin(&bo->base.base); 140 if (ret < 0) 141 return -EINVAL; 142 143 bo->pages = drm_gem_shmem_get_sg_table(&bo->base.base); 144 if (!bo->pages) { 145 drm_gem_shmem_unpin(&bo->base.base); 146 return -EINVAL; 147 } 148 149 if (use_dma_api) { 150 bo->mapped = dma_map_sg(vgdev->vdev->dev.parent, 151 bo->pages->sgl, bo->pages->nents, 152 DMA_TO_DEVICE); 153 *nents = bo->mapped; 154 } else { 155 *nents = bo->pages->nents; 156 } 157 158 *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry), 159 GFP_KERNEL); 160 if (!(*ents)) { 161 DRM_ERROR("failed to allocate ent list\n"); 162 return -ENOMEM; 163 } 164 165 for_each_sg(bo->pages->sgl, sg, *nents, si) { 166 (*ents)[si].addr = cpu_to_le64(use_dma_api 167 ? sg_dma_address(sg) 168 : sg_phys(sg)); 169 (*ents)[si].length = cpu_to_le32(sg->length); 170 (*ents)[si].padding = 0; 171 } 172 return 0; 173 } 174 175 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev, 176 struct virtio_gpu_object_params *params, 177 struct virtio_gpu_object **bo_ptr, 178 struct virtio_gpu_fence *fence) 179 { 180 struct virtio_gpu_object_array *objs = NULL; 181 struct drm_gem_shmem_object *shmem_obj; 182 struct virtio_gpu_object *bo; 183 struct virtio_gpu_mem_entry *ents; 184 unsigned int nents; 185 int ret; 186 187 *bo_ptr = NULL; 188 189 params->size = roundup(params->size, PAGE_SIZE); 190 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size); 191 if (IS_ERR(shmem_obj)) 192 return PTR_ERR(shmem_obj); 193 bo = gem_to_virtio_gpu_obj(&shmem_obj->base); 194 195 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle); 196 if (ret < 0) 197 goto err_free_gem; 198 199 bo->dumb = params->dumb; 200 201 if (fence) { 202 ret = -ENOMEM; 203 objs = virtio_gpu_array_alloc(1); 204 if (!objs) 205 goto err_put_id; 206 virtio_gpu_array_add_obj(objs, &bo->base.base); 207 208 ret = virtio_gpu_array_lock_resv(objs); 209 if (ret != 0) 210 goto err_put_objs; 211 } 212 213 if (params->virgl) { 214 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, 215 objs, fence); 216 } else { 217 virtio_gpu_cmd_create_resource(vgdev, bo, params, 218 objs, fence); 219 } 220 221 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents); 222 if (ret != 0) { 223 virtio_gpu_free_object(&shmem_obj->base); 224 return ret; 225 } 226 227 ret = virtio_gpu_object_attach(vgdev, bo, ents, nents); 228 if (ret != 0) { 229 virtio_gpu_free_object(&shmem_obj->base); 230 return ret; 231 } 232 233 virtio_gpu_notify(vgdev); 234 *bo_ptr = bo; 235 return 0; 236 237 err_put_objs: 238 virtio_gpu_array_put_free(objs); 239 err_put_id: 240 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 241 err_free_gem: 242 drm_gem_shmem_free_object(&shmem_obj->base); 243 return ret; 244 } 245