294 lines
8.2 KiB
C
294 lines
8.2 KiB
C
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/*
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* Copyright (C) 2015 Red Hat, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <drm/drmP.h>
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#include "virtgpu_drv.h"
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static void virtio_gpu_config_changed_work_func(struct work_struct *work)
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{
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struct virtio_gpu_device *vgdev =
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container_of(work, struct virtio_gpu_device,
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config_changed_work);
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u32 events_read, events_clear = 0;
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/* read the config space */
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virtio_cread(vgdev->vdev, struct virtio_gpu_config,
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events_read, &events_read);
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if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
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if (vgdev->has_edid)
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virtio_gpu_cmd_get_edids(vgdev);
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virtio_gpu_cmd_get_display_info(vgdev);
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drm_helper_hpd_irq_event(vgdev->ddev);
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events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
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}
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virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
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events_clear, &events_clear);
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}
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static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
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uint32_t nlen, const char *name)
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{
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int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
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if (handle < 0)
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return handle;
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handle += 1;
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virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
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return handle;
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}
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static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
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uint32_t ctx_id)
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{
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virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
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ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
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}
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static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
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void (*work_func)(struct work_struct *work))
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{
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spin_lock_init(&vgvq->qlock);
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init_waitqueue_head(&vgvq->ack_queue);
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INIT_WORK(&vgvq->dequeue_work, work_func);
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}
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static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
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int num_capsets)
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{
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int i, ret;
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vgdev->capsets = kcalloc(num_capsets,
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sizeof(struct virtio_gpu_drv_capset),
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GFP_KERNEL);
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if (!vgdev->capsets) {
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DRM_ERROR("failed to allocate cap sets\n");
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return;
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}
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for (i = 0; i < num_capsets; i++) {
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virtio_gpu_cmd_get_capset_info(vgdev, i);
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ret = wait_event_timeout(vgdev->resp_wq,
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vgdev->capsets[i].id > 0, 5 * HZ);
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if (ret == 0) {
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DRM_ERROR("timed out waiting for cap set %d\n", i);
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spin_lock(&vgdev->display_info_lock);
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kfree(vgdev->capsets);
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vgdev->capsets = NULL;
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spin_unlock(&vgdev->display_info_lock);
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return;
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}
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DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
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i, vgdev->capsets[i].id,
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vgdev->capsets[i].max_version,
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vgdev->capsets[i].max_size);
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}
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vgdev->num_capsets = num_capsets;
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}
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int virtio_gpu_init(struct drm_device *dev)
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{
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static vq_callback_t *callbacks[] = {
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virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
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};
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static const char * const names[] = { "control", "cursor" };
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struct virtio_gpu_device *vgdev;
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/* this will expand later */
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struct virtqueue *vqs[2];
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u32 num_scanouts, num_capsets;
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int ret;
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if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
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return -ENODEV;
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vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
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if (!vgdev)
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return -ENOMEM;
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vgdev->ddev = dev;
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dev->dev_private = vgdev;
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vgdev->vdev = dev_to_virtio(dev->dev);
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vgdev->dev = dev->dev;
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spin_lock_init(&vgdev->display_info_lock);
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ida_init(&vgdev->ctx_id_ida);
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ida_init(&vgdev->resource_ida);
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init_waitqueue_head(&vgdev->resp_wq);
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virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
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virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
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vgdev->fence_drv.context = dma_fence_context_alloc(1);
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spin_lock_init(&vgdev->fence_drv.lock);
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INIT_LIST_HEAD(&vgdev->fence_drv.fences);
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INIT_LIST_HEAD(&vgdev->cap_cache);
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INIT_WORK(&vgdev->config_changed_work,
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virtio_gpu_config_changed_work_func);
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#ifdef __LITTLE_ENDIAN
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if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
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vgdev->has_virgl_3d = true;
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DRM_INFO("virgl 3d acceleration %s\n",
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vgdev->has_virgl_3d ? "enabled" : "not supported by host");
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#else
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DRM_INFO("virgl 3d acceleration not supported by guest\n");
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#endif
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if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
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vgdev->has_edid = true;
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DRM_INFO("EDID support available.\n");
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}
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ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
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if (ret) {
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DRM_ERROR("failed to find virt queues\n");
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goto err_vqs;
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}
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vgdev->ctrlq.vq = vqs[0];
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vgdev->cursorq.vq = vqs[1];
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ret = virtio_gpu_alloc_vbufs(vgdev);
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if (ret) {
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DRM_ERROR("failed to alloc vbufs\n");
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goto err_vbufs;
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}
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ret = virtio_gpu_ttm_init(vgdev);
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if (ret) {
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DRM_ERROR("failed to init ttm %d\n", ret);
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goto err_ttm;
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}
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/* get display info */
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virtio_cread(vgdev->vdev, struct virtio_gpu_config,
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num_scanouts, &num_scanouts);
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vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
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VIRTIO_GPU_MAX_SCANOUTS);
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if (!vgdev->num_scanouts) {
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DRM_ERROR("num_scanouts is zero\n");
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ret = -EINVAL;
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goto err_scanouts;
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}
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DRM_INFO("number of scanouts: %d\n", num_scanouts);
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virtio_cread(vgdev->vdev, struct virtio_gpu_config,
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num_capsets, &num_capsets);
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DRM_INFO("number of cap sets: %d\n", num_capsets);
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virtio_gpu_modeset_init(vgdev);
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virtio_device_ready(vgdev->vdev);
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vgdev->vqs_ready = true;
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if (num_capsets)
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virtio_gpu_get_capsets(vgdev, num_capsets);
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if (vgdev->has_edid)
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virtio_gpu_cmd_get_edids(vgdev);
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virtio_gpu_cmd_get_display_info(vgdev);
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wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
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5 * HZ);
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return 0;
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err_scanouts:
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virtio_gpu_ttm_fini(vgdev);
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err_ttm:
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virtio_gpu_free_vbufs(vgdev);
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err_vbufs:
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vgdev->vdev->config->del_vqs(vgdev->vdev);
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err_vqs:
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kfree(vgdev);
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return ret;
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}
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static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
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{
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struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
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list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
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kfree(cache_ent->caps_cache);
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kfree(cache_ent);
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}
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}
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void virtio_gpu_deinit(struct drm_device *dev)
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{
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struct virtio_gpu_device *vgdev = dev->dev_private;
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vgdev->vqs_ready = false;
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flush_work(&vgdev->ctrlq.dequeue_work);
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flush_work(&vgdev->cursorq.dequeue_work);
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flush_work(&vgdev->config_changed_work);
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vgdev->vdev->config->reset(vgdev->vdev);
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vgdev->vdev->config->del_vqs(vgdev->vdev);
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virtio_gpu_modeset_fini(vgdev);
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virtio_gpu_ttm_fini(vgdev);
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virtio_gpu_free_vbufs(vgdev);
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virtio_gpu_cleanup_cap_cache(vgdev);
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kfree(vgdev->capsets);
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kfree(vgdev);
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}
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int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
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{
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struct virtio_gpu_device *vgdev = dev->dev_private;
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struct virtio_gpu_fpriv *vfpriv;
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int id;
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char dbgname[TASK_COMM_LEN];
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/* can't create contexts without 3d renderer */
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if (!vgdev->has_virgl_3d)
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return 0;
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/* allocate a virt GPU context for this opener */
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vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
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if (!vfpriv)
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return -ENOMEM;
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get_task_comm(dbgname, current);
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id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
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if (id < 0) {
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kfree(vfpriv);
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return id;
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}
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vfpriv->ctx_id = id;
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file->driver_priv = vfpriv;
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return 0;
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}
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void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
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{
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struct virtio_gpu_device *vgdev = dev->dev_private;
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struct virtio_gpu_fpriv *vfpriv;
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if (!vgdev->has_virgl_3d)
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return;
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vfpriv = file->driver_priv;
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virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
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kfree(vfpriv);
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file->driver_priv = NULL;
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}
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