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 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 atomic_t seqno = ATOMIC_INIT(0);
  47                 int handle = atomic_inc_return(&seqno);
  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         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
  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_sg(vgdev->vdev->dev.parent,
  76                                              shmem->pages->sgl, shmem->mapped,
  77                                              DMA_TO_DEVICE);
  78                                 shmem->mapped = 0;
  79                         }
  80
  81                         sg_free_table(shmem->pages);
  82                         kfree(shmem->pages);
  83                         shmem->pages = NULL;
  84                         drm_gem_shmem_unpin(&bo->base.base);
  85                 }
  86
  87                 drm_gem_shmem_free_object(&bo->base.base);
  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 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 106         .free = virtio_gpu_free_object,
 107         .open = virtio_gpu_gem_object_open,
 108         .close = virtio_gpu_gem_object_close,
 109
 110         .print_info = drm_gem_shmem_print_info,
 111         .pin = drm_gem_shmem_pin,
 112         .unpin = drm_gem_shmem_unpin,
 113         .get_sg_table = drm_gem_shmem_get_sg_table,
 114         .vmap = drm_gem_shmem_vmap,
 115         .vunmap = drm_gem_shmem_vunmap,
 116         .mmap = drm_gem_shmem_mmap,
 117 };
 118
 119 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
 120 {
 121         return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
 122 }
 123
 124 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
 125                                                 size_t size)
 126 {
 127         struct virtio_gpu_object_shmem *shmem;
 128         struct drm_gem_shmem_object *dshmem;
 129
 130         shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
 131         if (!shmem)
 132                 return NULL;
 133
 134         dshmem = &shmem->base.base;
 135         dshmem->base.funcs = &virtio_gpu_shmem_funcs;
 136         dshmem->map_cached = true;
 137         return &dshmem->base;
 138 }
 139
 140 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
 141                                         struct virtio_gpu_object *bo,
 142                                         struct virtio_gpu_mem_entry **ents,
 143                                         unsigned int *nents)
 144 {
 145         bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
 146         struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 147         struct scatterlist *sg;
 148         int si, ret;
 149
 150         ret = drm_gem_shmem_pin(&bo->base.base);
 151         if (ret < 0)
 152                 return -EINVAL;
 153
 154         /*
 155          * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
 156          * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
 157          * dma-ops. This is discouraged for other drivers, but should be fine
 158          * since virtio_gpu doesn't support dma-buf import from other devices.
 159          */
 160         shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
 161         if (!shmem->pages) {
 162                 drm_gem_shmem_unpin(&bo->base.base);
 163                 return -EINVAL;
 164         }
 165
 166         if (use_dma_api) {
 167                 shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
 168                                            shmem->pages->sgl,
 169                                            shmem->pages->nents,
 170                                            DMA_TO_DEVICE);
 171                 *nents = shmem->mapped;
 172         } else {
 173                 *nents = shmem->pages->nents;
 174         }
 175
 176         *ents = kmalloc_array(*nents, 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         for_each_sg(shmem->pages->sgl, sg, *nents, si) {
 184                 (*ents)[si].addr = cpu_to_le64(use_dma_api
 185                                                ? sg_dma_address(sg)
 186                                                : sg_phys(sg));
 187                 (*ents)[si].length = cpu_to_le32(sg->length);
 188                 (*ents)[si].padding = 0;
 189         }
 190         return 0;
 191 }
 192
 193 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 194                              struct virtio_gpu_object_params *params,
 195                              struct virtio_gpu_object **bo_ptr,
 196                              struct virtio_gpu_fence *fence)
 197 {
 198         struct virtio_gpu_object_array *objs = NULL;
 199         struct drm_gem_shmem_object *shmem_obj;
 200         struct virtio_gpu_object *bo;
 201         struct virtio_gpu_mem_entry *ents;
 202         unsigned int nents;
 203         int ret;
 204
 205         *bo_ptr = NULL;
 206
 207         params->size = roundup(params->size, PAGE_SIZE);
 208         shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
 209         if (IS_ERR(shmem_obj))
 210                 return PTR_ERR(shmem_obj);
 211         bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
 212
 213         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 214         if (ret < 0)
 215                 goto err_free_gem;
 216
 217         bo->dumb = params->dumb;
 218
 219         if (fence) {
 220                 ret = -ENOMEM;
 221                 objs = virtio_gpu_array_alloc(1);
 222                 if (!objs)
 223                         goto err_put_id;
 224                 virtio_gpu_array_add_obj(objs, &bo->base.base);
 225
 226                 ret = virtio_gpu_array_lock_resv(objs);
 227                 if (ret != 0)
 228                         goto err_put_objs;
 229         }
 230
 231         if (params->virgl) {
 232                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 233                                                   objs, fence);
 234         } else {
 235                 virtio_gpu_cmd_create_resource(vgdev, bo, params,
 236                                                objs, fence);
 237         }
 238
 239         ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
 240         if (ret != 0) {
 241                 virtio_gpu_free_object(&shmem_obj->base);
 242                 return ret;
 243         }
 244
 245         virtio_gpu_object_attach(vgdev, bo, ents, nents);
 246
 247         *bo_ptr = bo;
 248         return 0;
 249
 250 err_put_objs:
 251         virtio_gpu_array_put_free(objs);
 252 err_put_id:
 253         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 254 err_free_gem:
 255         drm_gem_shmem_free_object(&shmem_obj->base);
 256         return ret;
 257 }