drivers/gpu/drm/virtio/virtgpu_object.c

   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.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
 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
 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
 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 NULL;
 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.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
 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                 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
 258                                                     ents, nents);
 259         } else if (params->virgl) {
 260                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 261                                                   objs, fence);
 262                 virtio_gpu_object_attach(vgdev, bo, ents, nents);
 263         } else {
 264                 virtio_gpu_cmd_create_resource(vgdev, bo, params,
 265                                                objs, fence);
 266                 virtio_gpu_object_attach(vgdev, bo, ents, nents);
 267         }
 268
 269         *bo_ptr = bo;
 270         return 0;
 271
 272 err_put_objs:
 273         virtio_gpu_array_put_free(objs);
 274 err_put_id:
 275         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 276 err_free_gem:
 277         drm_gem_shmem_free_object(&shmem_obj->base);
 278         return ret;
 279 }