linux/drivers/gpu/drm/virtio/virtgpu_object.c
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   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
  31static int virtio_gpu_virglrenderer_workaround = 1;
  32module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
  33
  34static 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
  58static 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
  65void 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                        shmem->pages = NULL;
  83                        drm_gem_shmem_unpin(&bo->base.base);
  84                }
  85
  86                drm_gem_shmem_free_object(&bo->base.base);
  87        }
  88}
  89
  90static void virtio_gpu_free_object(struct drm_gem_object *obj)
  91{
  92        struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
  93        struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
  94
  95        if (bo->created) {
  96                virtio_gpu_cmd_unref_resource(vgdev, bo);
  97                virtio_gpu_notify(vgdev);
  98                /* completion handler calls virtio_gpu_cleanup_object() */
  99                return;
 100        }
 101        virtio_gpu_cleanup_object(bo);
 102}
 103
 104static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 105        .free = virtio_gpu_free_object,
 106        .open = virtio_gpu_gem_object_open,
 107        .close = virtio_gpu_gem_object_close,
 108
 109        .print_info = drm_gem_shmem_print_info,
 110        .pin = drm_gem_shmem_pin,
 111        .unpin = drm_gem_shmem_unpin,
 112        .get_sg_table = drm_gem_shmem_get_sg_table,
 113        .vmap = drm_gem_shmem_vmap,
 114        .vunmap = drm_gem_shmem_vunmap,
 115        .mmap = drm_gem_shmem_mmap,
 116};
 117
 118bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
 119{
 120        return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
 121}
 122
 123struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
 124                                                size_t size)
 125{
 126        struct virtio_gpu_object_shmem *shmem;
 127        struct drm_gem_shmem_object *dshmem;
 128
 129        shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
 130        if (!shmem)
 131                return NULL;
 132
 133        dshmem = &shmem->base.base;
 134        dshmem->base.funcs = &virtio_gpu_shmem_funcs;
 135        dshmem->map_cached = true;
 136        return &dshmem->base;
 137}
 138
 139static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
 140                                        struct virtio_gpu_object *bo,
 141                                        struct virtio_gpu_mem_entry **ents,
 142                                        unsigned int *nents)
 143{
 144        bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
 145        struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 146        struct scatterlist *sg;
 147        int si, ret;
 148
 149        ret = drm_gem_shmem_pin(&bo->base.base);
 150        if (ret < 0)
 151                return -EINVAL;
 152
 153        shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
 154        if (!shmem->pages) {
 155                drm_gem_shmem_unpin(&bo->base.base);
 156                return -EINVAL;
 157        }
 158
 159        if (use_dma_api) {
 160                shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
 161                                           shmem->pages->sgl,
 162                                           shmem->pages->nents,
 163                                           DMA_TO_DEVICE);
 164                *nents = shmem->mapped;
 165        } else {
 166                *nents = shmem->pages->nents;
 167        }
 168
 169        *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
 170                              GFP_KERNEL);
 171        if (!(*ents)) {
 172                DRM_ERROR("failed to allocate ent list\n");
 173                return -ENOMEM;
 174        }
 175
 176        for_each_sg(shmem->pages->sgl, sg, *nents, si) {
 177                (*ents)[si].addr = cpu_to_le64(use_dma_api
 178                                               ? sg_dma_address(sg)
 179                                               : sg_phys(sg));
 180                (*ents)[si].length = cpu_to_le32(sg->length);
 181                (*ents)[si].padding = 0;
 182        }
 183        return 0;
 184}
 185
 186int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 187                             struct virtio_gpu_object_params *params,
 188                             struct virtio_gpu_object **bo_ptr,
 189                             struct virtio_gpu_fence *fence)
 190{
 191        struct virtio_gpu_object_array *objs = NULL;
 192        struct drm_gem_shmem_object *shmem_obj;
 193        struct virtio_gpu_object *bo;
 194        struct virtio_gpu_mem_entry *ents;
 195        unsigned int nents;
 196        int ret;
 197
 198        *bo_ptr = NULL;
 199
 200        params->size = roundup(params->size, PAGE_SIZE);
 201        shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
 202        if (IS_ERR(shmem_obj))
 203                return PTR_ERR(shmem_obj);
 204        bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
 205
 206        ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 207        if (ret < 0)
 208                goto err_free_gem;
 209
 210        bo->dumb = params->dumb;
 211
 212        if (fence) {
 213                ret = -ENOMEM;
 214                objs = virtio_gpu_array_alloc(1);
 215                if (!objs)
 216                        goto err_put_id;
 217                virtio_gpu_array_add_obj(objs, &bo->base.base);
 218
 219                ret = virtio_gpu_array_lock_resv(objs);
 220                if (ret != 0)
 221                        goto err_put_objs;
 222        }
 223
 224        if (params->virgl) {
 225                virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 226                                                  objs, fence);
 227        } else {
 228                virtio_gpu_cmd_create_resource(vgdev, bo, params,
 229                                               objs, fence);
 230        }
 231
 232        ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
 233        if (ret != 0) {
 234                virtio_gpu_free_object(&shmem_obj->base);
 235                return ret;
 236        }
 237
 238        ret = virtio_gpu_object_attach(vgdev, bo, ents, nents);
 239        if (ret != 0) {
 240                virtio_gpu_free_object(&shmem_obj->base);
 241                return ret;
 242        }
 243
 244        virtio_gpu_notify(vgdev);
 245        *bo_ptr = bo;
 246        return 0;
 247
 248err_put_objs:
 249        virtio_gpu_array_put_free(objs);
 250err_put_id:
 251        virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 252err_free_gem:
 253        drm_gem_shmem_free_object(&shmem_obj->base);
 254        return ret;
 255}
 256