LXR linux/drivers/gpu/drm/virtio/virtgpu

   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
  34int 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
  57static 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
  64void 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
 101static 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
 115static 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
 130bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
 131{
 132        return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
 133}
 134
 135struct 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
 150static 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
 211int 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                if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
 258                        bo->guest_blob = true;
 259
 260                virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
 261                                                    ents, nents);
 262        } else if (params->virgl) {
 263                virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 264                                                  objs, fence);
 265                virtio_gpu_object_attach(vgdev, bo, ents, nents);
 266        } else {
 267                virtio_gpu_cmd_create_resource(vgdev, bo, params,
 268                                               objs, fence);
 269                virtio_gpu_object_attach(vgdev, bo, ents, nents);
 270        }
 271
 272        *bo_ptr = bo;
 273        return 0;
 274
 275err_put_objs:
 276        virtio_gpu_array_put_free(objs);
 277err_put_id:
 278        virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 279err_free_gem:
 280        drm_gem_shmem_free_object(&shmem_obj->base);
 281        return ret;
 282}
 283