linux/drivers/gpu/drm/virtio/virtgpu_kms.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/virtio.h>
  27#include <linux/virtio_config.h>
  28#include <drm/drmP.h>
  29#include "virtgpu_drv.h"
  30
  31static int virtio_gpu_fbdev = 1;
  32
  33MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console");
  34module_param_named(fbdev, virtio_gpu_fbdev, int, 0400);
  35
  36static void virtio_gpu_config_changed_work_func(struct work_struct *work)
  37{
  38        struct virtio_gpu_device *vgdev =
  39                container_of(work, struct virtio_gpu_device,
  40                             config_changed_work);
  41        u32 events_read, events_clear = 0;
  42
  43        /* read the config space */
  44        virtio_cread(vgdev->vdev, struct virtio_gpu_config,
  45                     events_read, &events_read);
  46        if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
  47                virtio_gpu_cmd_get_display_info(vgdev);
  48                drm_helper_hpd_irq_event(vgdev->ddev);
  49                events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
  50        }
  51        virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
  52                      events_clear, &events_clear);
  53}
  54
  55static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev,
  56                                  uint32_t *resid)
  57{
  58        int handle;
  59
  60        idr_preload(GFP_KERNEL);
  61        spin_lock(&vgdev->ctx_id_idr_lock);
  62        handle = idr_alloc(&vgdev->ctx_id_idr, NULL, 1, 0, 0);
  63        spin_unlock(&vgdev->ctx_id_idr_lock);
  64        idr_preload_end();
  65        *resid = handle;
  66}
  67
  68static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
  69{
  70        spin_lock(&vgdev->ctx_id_idr_lock);
  71        idr_remove(&vgdev->ctx_id_idr, id);
  72        spin_unlock(&vgdev->ctx_id_idr_lock);
  73}
  74
  75static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
  76                                      uint32_t nlen, const char *name,
  77                                      uint32_t *ctx_id)
  78{
  79        virtio_gpu_ctx_id_get(vgdev, ctx_id);
  80        virtio_gpu_cmd_context_create(vgdev, *ctx_id, nlen, name);
  81}
  82
  83static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
  84                                      uint32_t ctx_id)
  85{
  86        virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
  87        virtio_gpu_ctx_id_put(vgdev, ctx_id);
  88}
  89
  90static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
  91                               void (*work_func)(struct work_struct *work))
  92{
  93        spin_lock_init(&vgvq->qlock);
  94        init_waitqueue_head(&vgvq->ack_queue);
  95        INIT_WORK(&vgvq->dequeue_work, work_func);
  96}
  97
  98static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
  99                                   int num_capsets)
 100{
 101        int i, ret;
 102
 103        vgdev->capsets = kcalloc(num_capsets,
 104                                 sizeof(struct virtio_gpu_drv_capset),
 105                                 GFP_KERNEL);
 106        if (!vgdev->capsets) {
 107                DRM_ERROR("failed to allocate cap sets\n");
 108                return;
 109        }
 110        for (i = 0; i < num_capsets; i++) {
 111                virtio_gpu_cmd_get_capset_info(vgdev, i);
 112                ret = wait_event_timeout(vgdev->resp_wq,
 113                                         vgdev->capsets[i].id > 0, 5 * HZ);
 114                if (ret == 0) {
 115                        DRM_ERROR("timed out waiting for cap set %d\n", i);
 116                        kfree(vgdev->capsets);
 117                        vgdev->capsets = NULL;
 118                        return;
 119                }
 120                DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
 121                         i, vgdev->capsets[i].id,
 122                         vgdev->capsets[i].max_version,
 123                         vgdev->capsets[i].max_size);
 124        }
 125        vgdev->num_capsets = num_capsets;
 126}
 127
 128int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
 129{
 130        static vq_callback_t *callbacks[] = {
 131                virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
 132        };
 133        static const char * const names[] = { "control", "cursor" };
 134
 135        struct virtio_gpu_device *vgdev;
 136        /* this will expand later */
 137        struct virtqueue *vqs[2];
 138        u32 num_scanouts, num_capsets;
 139        int ret;
 140
 141        if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1))
 142                return -ENODEV;
 143
 144        vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
 145        if (!vgdev)
 146                return -ENOMEM;
 147
 148        vgdev->ddev = dev;
 149        dev->dev_private = vgdev;
 150        vgdev->vdev = dev->virtdev;
 151        vgdev->dev = dev->dev;
 152
 153        spin_lock_init(&vgdev->display_info_lock);
 154        spin_lock_init(&vgdev->ctx_id_idr_lock);
 155        idr_init(&vgdev->ctx_id_idr);
 156        spin_lock_init(&vgdev->resource_idr_lock);
 157        idr_init(&vgdev->resource_idr);
 158        init_waitqueue_head(&vgdev->resp_wq);
 159        virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
 160        virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
 161
 162        vgdev->fence_drv.context = dma_fence_context_alloc(1);
 163        spin_lock_init(&vgdev->fence_drv.lock);
 164        INIT_LIST_HEAD(&vgdev->fence_drv.fences);
 165        INIT_LIST_HEAD(&vgdev->cap_cache);
 166        INIT_WORK(&vgdev->config_changed_work,
 167                  virtio_gpu_config_changed_work_func);
 168
 169        if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
 170                vgdev->has_virgl_3d = true;
 171        DRM_INFO("virgl 3d acceleration %s\n",
 172                 vgdev->has_virgl_3d ? "enabled" : "not available");
 173
 174        ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs,
 175                                            callbacks, names);
 176        if (ret) {
 177                DRM_ERROR("failed to find virt queues\n");
 178                goto err_vqs;
 179        }
 180        vgdev->ctrlq.vq = vqs[0];
 181        vgdev->cursorq.vq = vqs[1];
 182        ret = virtio_gpu_alloc_vbufs(vgdev);
 183        if (ret) {
 184                DRM_ERROR("failed to alloc vbufs\n");
 185                goto err_vbufs;
 186        }
 187
 188        ret = virtio_gpu_ttm_init(vgdev);
 189        if (ret) {
 190                DRM_ERROR("failed to init ttm %d\n", ret);
 191                goto err_ttm;
 192        }
 193
 194        /* get display info */
 195        virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 196                     num_scanouts, &num_scanouts);
 197        vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
 198                                    VIRTIO_GPU_MAX_SCANOUTS);
 199        if (!vgdev->num_scanouts) {
 200                DRM_ERROR("num_scanouts is zero\n");
 201                ret = -EINVAL;
 202                goto err_scanouts;
 203        }
 204        DRM_INFO("number of scanouts: %d\n", num_scanouts);
 205
 206        virtio_cread(vgdev->vdev, struct virtio_gpu_config,
 207                     num_capsets, &num_capsets);
 208        DRM_INFO("number of cap sets: %d\n", num_capsets);
 209
 210        ret = virtio_gpu_modeset_init(vgdev);
 211        if (ret)
 212                goto err_modeset;
 213
 214        virtio_device_ready(vgdev->vdev);
 215        vgdev->vqs_ready = true;
 216
 217        if (num_capsets)
 218                virtio_gpu_get_capsets(vgdev, num_capsets);
 219        virtio_gpu_cmd_get_display_info(vgdev);
 220        wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
 221                           5 * HZ);
 222        if (virtio_gpu_fbdev)
 223                virtio_gpu_fbdev_init(vgdev);
 224
 225        return 0;
 226
 227err_modeset:
 228err_scanouts:
 229        virtio_gpu_ttm_fini(vgdev);
 230err_ttm:
 231        virtio_gpu_free_vbufs(vgdev);
 232err_vbufs:
 233        vgdev->vdev->config->del_vqs(vgdev->vdev);
 234err_vqs:
 235        kfree(vgdev);
 236        return ret;
 237}
 238
 239static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
 240{
 241        struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
 242
 243        list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
 244                kfree(cache_ent->caps_cache);
 245                kfree(cache_ent);
 246        }
 247}
 248
 249int virtio_gpu_driver_unload(struct drm_device *dev)
 250{
 251        struct virtio_gpu_device *vgdev = dev->dev_private;
 252
 253        vgdev->vqs_ready = false;
 254        flush_work(&vgdev->ctrlq.dequeue_work);
 255        flush_work(&vgdev->cursorq.dequeue_work);
 256        flush_work(&vgdev->config_changed_work);
 257        vgdev->vdev->config->del_vqs(vgdev->vdev);
 258
 259        virtio_gpu_modeset_fini(vgdev);
 260        virtio_gpu_ttm_fini(vgdev);
 261        virtio_gpu_free_vbufs(vgdev);
 262        virtio_gpu_cleanup_cap_cache(vgdev);
 263        kfree(vgdev->capsets);
 264        kfree(vgdev);
 265        return 0;
 266}
 267
 268int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 269{
 270        struct virtio_gpu_device *vgdev = dev->dev_private;
 271        struct virtio_gpu_fpriv *vfpriv;
 272        uint32_t id;
 273        char dbgname[64], tmpname[TASK_COMM_LEN];
 274
 275        /* can't create contexts without 3d renderer */
 276        if (!vgdev->has_virgl_3d)
 277                return 0;
 278
 279        get_task_comm(tmpname, current);
 280        snprintf(dbgname, sizeof(dbgname), "%s", tmpname);
 281        dbgname[63] = 0;
 282        /* allocate a virt GPU context for this opener */
 283        vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
 284        if (!vfpriv)
 285                return -ENOMEM;
 286
 287        virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname, &id);
 288
 289        vfpriv->ctx_id = id;
 290        file->driver_priv = vfpriv;
 291        return 0;
 292}
 293
 294void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 295{
 296        struct virtio_gpu_device *vgdev = dev->dev_private;
 297        struct virtio_gpu_fpriv *vfpriv;
 298
 299        if (!vgdev->has_virgl_3d)
 300                return;
 301
 302        vfpriv = file->driver_priv;
 303
 304        virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
 305        kfree(vfpriv);
 306        file->driver_priv = NULL;
 307}
 308