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 <drm/drm_file.h>
  27#include <drm/drm_fourcc.h>
  28
  29#include "virtgpu_drv.h"
  30
  31static int virtio_gpu_gem_create(struct drm_file *file,
  32                                 struct drm_device *dev,
  33                                 struct virtio_gpu_object_params *params,
  34                                 struct drm_gem_object **obj_p,
  35                                 uint32_t *handle_p)
  36{
  37        struct virtio_gpu_device *vgdev = dev->dev_private;
  38        struct virtio_gpu_object *obj;
  39        int ret;
  40        u32 handle;
  41
  42        ret = virtio_gpu_object_create(vgdev, params, &obj, NULL);
  43        if (ret < 0)
  44                return ret;
  45
  46        ret = drm_gem_handle_create(file, &obj->base.base, &handle);
  47        if (ret) {
  48                drm_gem_object_release(&obj->base.base);
  49                return ret;
  50        }
  51
  52        *obj_p = &obj->base.base;
  53
  54        /* drop reference from allocate - handle holds it now */
  55        drm_gem_object_put(&obj->base.base);
  56
  57        *handle_p = handle;
  58        return 0;
  59}
  60
  61int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
  62                                struct drm_device *dev,
  63                                struct drm_mode_create_dumb *args)
  64{
  65        struct drm_gem_object *gobj;
  66        struct virtio_gpu_object_params params = { 0 };
  67        int ret;
  68        uint32_t pitch;
  69
  70        if (args->bpp != 32)
  71                return -EINVAL;
  72
  73        pitch = args->width * 4;
  74        args->size = pitch * args->height;
  75        args->size = ALIGN(args->size, PAGE_SIZE);
  76
  77        params.format = virtio_gpu_translate_format(DRM_FORMAT_HOST_XRGB8888);
  78        params.width = args->width;
  79        params.height = args->height;
  80        params.size = args->size;
  81        params.dumb = true;
  82        ret = virtio_gpu_gem_create(file_priv, dev, &params, &gobj,
  83                                    &args->handle);
  84        if (ret)
  85                goto fail;
  86
  87        args->pitch = pitch;
  88        return ret;
  89
  90fail:
  91        return ret;
  92}
  93
  94int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
  95                              struct drm_device *dev,
  96                              uint32_t handle, uint64_t *offset_p)
  97{
  98        struct drm_gem_object *gobj;
  99
 100        BUG_ON(!offset_p);
 101        gobj = drm_gem_object_lookup(file_priv, handle);
 102        if (gobj == NULL)
 103                return -ENOENT;
 104        *offset_p = drm_vma_node_offset_addr(&gobj->vma_node);
 105        drm_gem_object_put(gobj);
 106        return 0;
 107}
 108
 109int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 110                               struct drm_file *file)
 111{
 112        struct virtio_gpu_device *vgdev = obj->dev->dev_private;
 113        struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 114        struct virtio_gpu_object_array *objs;
 115
 116        if (!vgdev->has_virgl_3d)
 117                goto out_notify;
 118
 119        /* the context might still be missing when the first ioctl is
 120         * DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
 121         */
 122        virtio_gpu_create_context(obj->dev, file);
 123
 124        objs = virtio_gpu_array_alloc(1);
 125        if (!objs)
 126                return -ENOMEM;
 127        virtio_gpu_array_add_obj(objs, obj);
 128
 129        virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id,
 130                                               objs);
 131out_notify:
 132        virtio_gpu_notify(vgdev);
 133        return 0;
 134}
 135
 136void virtio_gpu_gem_object_close(struct drm_gem_object *obj,
 137                                 struct drm_file *file)
 138{
 139        struct virtio_gpu_device *vgdev = obj->dev->dev_private;
 140        struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 141        struct virtio_gpu_object_array *objs;
 142
 143        if (!vgdev->has_virgl_3d)
 144                return;
 145
 146        objs = virtio_gpu_array_alloc(1);
 147        if (!objs)
 148                return;
 149        virtio_gpu_array_add_obj(objs, obj);
 150
 151        virtio_gpu_cmd_context_detach_resource(vgdev, vfpriv->ctx_id,
 152                                               objs);
 153        virtio_gpu_notify(vgdev);
 154}
 155
 156struct virtio_gpu_object_array *virtio_gpu_array_alloc(u32 nents)
 157{
 158        struct virtio_gpu_object_array *objs;
 159
 160        objs = kmalloc(struct_size(objs, objs, nents), GFP_KERNEL);
 161        if (!objs)
 162                return NULL;
 163
 164        objs->nents = 0;
 165        objs->total = nents;
 166        return objs;
 167}
 168
 169static void virtio_gpu_array_free(struct virtio_gpu_object_array *objs)
 170{
 171        kfree(objs);
 172}
 173
 174struct virtio_gpu_object_array*
 175virtio_gpu_array_from_handles(struct drm_file *drm_file, u32 *handles, u32 nents)
 176{
 177        struct virtio_gpu_object_array *objs;
 178        u32 i;
 179
 180        objs = virtio_gpu_array_alloc(nents);
 181        if (!objs)
 182                return NULL;
 183
 184        for (i = 0; i < nents; i++) {
 185                objs->objs[i] = drm_gem_object_lookup(drm_file, handles[i]);
 186                if (!objs->objs[i]) {
 187                        objs->nents = i;
 188                        virtio_gpu_array_put_free(objs);
 189                        return NULL;
 190                }
 191        }
 192        objs->nents = i;
 193        return objs;
 194}
 195
 196void virtio_gpu_array_add_obj(struct virtio_gpu_object_array *objs,
 197                              struct drm_gem_object *obj)
 198{
 199        if (WARN_ON_ONCE(objs->nents == objs->total))
 200                return;
 201
 202        drm_gem_object_get(obj);
 203        objs->objs[objs->nents] = obj;
 204        objs->nents++;
 205}
 206
 207int virtio_gpu_array_lock_resv(struct virtio_gpu_object_array *objs)
 208{
 209        int ret;
 210
 211        if (objs->nents == 1) {
 212                ret = dma_resv_lock_interruptible(objs->objs[0]->resv, NULL);
 213        } else {
 214                ret = drm_gem_lock_reservations(objs->objs, objs->nents,
 215                                                &objs->ticket);
 216        }
 217        return ret;
 218}
 219
 220void virtio_gpu_array_unlock_resv(struct virtio_gpu_object_array *objs)
 221{
 222        if (objs->nents == 1) {
 223                dma_resv_unlock(objs->objs[0]->resv);
 224        } else {
 225                drm_gem_unlock_reservations(objs->objs, objs->nents,
 226                                            &objs->ticket);
 227        }
 228}
 229
 230void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
 231                                struct dma_fence *fence)
 232{
 233        int i;
 234
 235        for (i = 0; i < objs->nents; i++)
 236                dma_resv_add_excl_fence(objs->objs[i]->resv, fence);
 237}
 238
 239void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs)
 240{
 241        u32 i;
 242
 243        for (i = 0; i < objs->nents; i++)
 244                drm_gem_object_put(objs->objs[i]);
 245        virtio_gpu_array_free(objs);
 246}
 247
 248void virtio_gpu_array_put_free_delayed(struct virtio_gpu_device *vgdev,
 249                                       struct virtio_gpu_object_array *objs)
 250{
 251        spin_lock(&vgdev->obj_free_lock);
 252        list_add_tail(&objs->next, &vgdev->obj_free_list);
 253        spin_unlock(&vgdev->obj_free_lock);
 254        schedule_work(&vgdev->obj_free_work);
 255}
 256
 257void virtio_gpu_array_put_free_work(struct work_struct *work)
 258{
 259        struct virtio_gpu_device *vgdev =
 260                container_of(work, struct virtio_gpu_device, obj_free_work);
 261        struct virtio_gpu_object_array *objs;
 262
 263        spin_lock(&vgdev->obj_free_lock);
 264        while (!list_empty(&vgdev->obj_free_list)) {
 265                objs = list_first_entry(&vgdev->obj_free_list,
 266                                        struct virtio_gpu_object_array, next);
 267                list_del(&objs->next);
 268                spin_unlock(&vgdev->obj_free_lock);
 269                virtio_gpu_array_put_free(objs);
 270                spin_lock(&vgdev->obj_free_lock);
 271        }
 272        spin_unlock(&vgdev->obj_free_lock);
 273}
 274