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 31 static int virtio_gpu_fbdev = 1; 32 33 MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console"); 34 module_param_named(fbdev, virtio_gpu_fbdev, int, 0400); 35 36 static 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 55 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq, 56 void (*work_func)(struct work_struct *work)) 57 { 58 spin_lock_init(&vgvq->qlock); 59 init_waitqueue_head(&vgvq->ack_queue); 60 INIT_WORK(&vgvq->dequeue_work, work_func); 61 } 62 63 int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags) 64 { 65 static vq_callback_t *callbacks[] = { 66 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack 67 }; 68 static const char *names[] = { "control", "cursor" }; 69 70 struct virtio_gpu_device *vgdev; 71 /* this will expand later */ 72 struct virtqueue *vqs[2]; 73 u32 num_scanouts; 74 int ret; 75 76 if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1)) 77 return -ENODEV; 78 79 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL); 80 if (!vgdev) 81 return -ENOMEM; 82 83 vgdev->ddev = dev; 84 dev->dev_private = vgdev; 85 vgdev->vdev = dev->virtdev; 86 vgdev->dev = dev->dev; 87 88 spin_lock_init(&vgdev->display_info_lock); 89 spin_lock_init(&vgdev->ctx_id_idr_lock); 90 idr_init(&vgdev->ctx_id_idr); 91 spin_lock_init(&vgdev->resource_idr_lock); 92 idr_init(&vgdev->resource_idr); 93 init_waitqueue_head(&vgdev->resp_wq); 94 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func); 95 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func); 96 97 spin_lock_init(&vgdev->fence_drv.lock); 98 INIT_LIST_HEAD(&vgdev->fence_drv.fences); 99 INIT_WORK(&vgdev->config_changed_work, 100 virtio_gpu_config_changed_work_func); 101 102 ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs, 103 callbacks, names); 104 if (ret) { 105 DRM_ERROR("failed to find virt queues\n"); 106 goto err_vqs; 107 } 108 vgdev->ctrlq.vq = vqs[0]; 109 vgdev->cursorq.vq = vqs[1]; 110 ret = virtio_gpu_alloc_vbufs(vgdev); 111 if (ret) { 112 DRM_ERROR("failed to alloc vbufs\n"); 113 goto err_vbufs; 114 } 115 116 ret = virtio_gpu_ttm_init(vgdev); 117 if (ret) { 118 DRM_ERROR("failed to init ttm %d\n", ret); 119 goto err_ttm; 120 } 121 122 /* get display info */ 123 virtio_cread(vgdev->vdev, struct virtio_gpu_config, 124 num_scanouts, &num_scanouts); 125 vgdev->num_scanouts = min_t(uint32_t, num_scanouts, 126 VIRTIO_GPU_MAX_SCANOUTS); 127 if (!vgdev->num_scanouts) { 128 DRM_ERROR("num_scanouts is zero\n"); 129 ret = -EINVAL; 130 goto err_scanouts; 131 } 132 133 ret = virtio_gpu_modeset_init(vgdev); 134 if (ret) 135 goto err_modeset; 136 137 virtio_device_ready(vgdev->vdev); 138 vgdev->vqs_ready = true; 139 140 virtio_gpu_cmd_get_display_info(vgdev); 141 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending, 142 5 * HZ); 143 if (virtio_gpu_fbdev) 144 virtio_gpu_fbdev_init(vgdev); 145 146 return 0; 147 148 err_modeset: 149 err_scanouts: 150 virtio_gpu_ttm_fini(vgdev); 151 err_ttm: 152 virtio_gpu_free_vbufs(vgdev); 153 err_vbufs: 154 vgdev->vdev->config->del_vqs(vgdev->vdev); 155 err_vqs: 156 kfree(vgdev); 157 return ret; 158 } 159 160 int virtio_gpu_driver_unload(struct drm_device *dev) 161 { 162 struct virtio_gpu_device *vgdev = dev->dev_private; 163 164 vgdev->vqs_ready = false; 165 flush_work(&vgdev->ctrlq.dequeue_work); 166 flush_work(&vgdev->cursorq.dequeue_work); 167 flush_work(&vgdev->config_changed_work); 168 vgdev->vdev->config->del_vqs(vgdev->vdev); 169 170 virtio_gpu_modeset_fini(vgdev); 171 virtio_gpu_ttm_fini(vgdev); 172 virtio_gpu_free_vbufs(vgdev); 173 kfree(vgdev); 174 return 0; 175 } 176