1 files changed, 306 insertions, 0 deletions

diff --git a/kernel/drivers/gpu/drm/virtio/virtgpu_kms.c b/kernel/drivers/gpu/drm/virtio/virtgpu_kms.c
new file mode 100644
index 000000000..06496a128
--- /dev/null
+++ b/kernel/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -0,0 +1,306 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/virtio.h>
+#include <linux/virtio_config.h>
+#include <drm/drmP.h>
+#include "virtgpu_drv.h"
+
+static int virtio_gpu_fbdev = 1;
+
+MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console");
+module_param_named(fbdev, virtio_gpu_fbdev, int, 0400);
+
+static void virtio_gpu_config_changed_work_func(struct work_struct *work)
+{
+	struct virtio_gpu_device *vgdev =
+		container_of(work, struct virtio_gpu_device,
+			     config_changed_work);
+	u32 events_read, events_clear = 0;
+
+	/* read the config space */
+	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
+		     events_read, &events_read);
+	if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
+		virtio_gpu_cmd_get_display_info(vgdev);
+		drm_helper_hpd_irq_event(vgdev->ddev);
+		events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
+	}
+	virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
+		      events_clear, &events_clear);
+}
+
+static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev,
+				  uint32_t *resid)
+{
+	int handle;
+
+	idr_preload(GFP_KERNEL);
+	spin_lock(&vgdev->ctx_id_idr_lock);
+	handle = idr_alloc(&vgdev->ctx_id_idr, NULL, 1, 0, 0);
+	spin_unlock(&vgdev->ctx_id_idr_lock);
+	idr_preload_end();
+	*resid = handle;
+}
+
+static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
+{
+	spin_lock(&vgdev->ctx_id_idr_lock);
+	idr_remove(&vgdev->ctx_id_idr, id);
+	spin_unlock(&vgdev->ctx_id_idr_lock);
+}
+
+static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
+				      uint32_t nlen, const char *name,
+				      uint32_t *ctx_id)
+{
+	virtio_gpu_ctx_id_get(vgdev, ctx_id);
+	virtio_gpu_cmd_context_create(vgdev, *ctx_id, nlen, name);
+}
+
+static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
+				      uint32_t ctx_id)
+{
+	virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
+	virtio_gpu_ctx_id_put(vgdev, ctx_id);
+}
+
+static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
+			       void (*work_func)(struct work_struct *work))
+{
+	spin_lock_init(&vgvq->qlock);
+	init_waitqueue_head(&vgvq->ack_queue);
+	INIT_WORK(&vgvq->dequeue_work, work_func);
+}
+
+static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
+				   int num_capsets)
+{
+	int i, ret;
+
+	vgdev->capsets = kcalloc(num_capsets,
+				 sizeof(struct virtio_gpu_drv_capset),
+				 GFP_KERNEL);
+	if (!vgdev->capsets) {
+		DRM_ERROR("failed to allocate cap sets\n");
+		return;
+	}
+	for (i = 0; i < num_capsets; i++) {
+		virtio_gpu_cmd_get_capset_info(vgdev, i);
+		ret = wait_event_timeout(vgdev->resp_wq,
+					 vgdev->capsets[i].id > 0, 5 * HZ);
+		if (ret == 0) {
+			DRM_ERROR("timed out waiting for cap set %d\n", i);
+			kfree(vgdev->capsets);
+			vgdev->capsets = NULL;
+			return;
+		}
+		DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
+			 i, vgdev->capsets[i].id,
+			 vgdev->capsets[i].max_version,
+			 vgdev->capsets[i].max_size);
+	}
+	vgdev->num_capsets = num_capsets;
+}
+
+int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
+{
+	static vq_callback_t *callbacks[] = {
+		virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
+	};
+	static const char *names[] = { "control", "cursor" };
+
+	struct virtio_gpu_device *vgdev;
+	/* this will expand later */
+	struct virtqueue *vqs[2];
+	u32 num_scanouts, num_capsets;
+	int ret;
+
+	if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1))
+		return -ENODEV;
+
+	vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
+	if (!vgdev)
+		return -ENOMEM;
+
+	vgdev->ddev = dev;
+	dev->dev_private = vgdev;
+	vgdev->vdev = dev->virtdev;
+	vgdev->dev = dev->dev;
+
+	spin_lock_init(&vgdev->display_info_lock);
+	spin_lock_init(&vgdev->ctx_id_idr_lock);
+	idr_init(&vgdev->ctx_id_idr);
+	spin_lock_init(&vgdev->resource_idr_lock);
+	idr_init(&vgdev->resource_idr);
+	init_waitqueue_head(&vgdev->resp_wq);
+	virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
+	virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
+
+	spin_lock_init(&vgdev->fence_drv.lock);
+	INIT_LIST_HEAD(&vgdev->fence_drv.fences);
+	INIT_LIST_HEAD(&vgdev->cap_cache);
+	INIT_WORK(&vgdev->config_changed_work,
+		  virtio_gpu_config_changed_work_func);
+
+	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
+		vgdev->has_virgl_3d = true;
+	DRM_INFO("virgl 3d acceleration %s\n",
+		 vgdev->has_virgl_3d ? "enabled" : "not available");
+
+	ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs,
+					    callbacks, names);
+	if (ret) {
+		DRM_ERROR("failed to find virt queues\n");
+		goto err_vqs;
+	}
+	vgdev->ctrlq.vq = vqs[0];
+	vgdev->cursorq.vq = vqs[1];
+	ret = virtio_gpu_alloc_vbufs(vgdev);
+	if (ret) {
+		DRM_ERROR("failed to alloc vbufs\n");
+		goto err_vbufs;
+	}
+
+	ret = virtio_gpu_ttm_init(vgdev);
+	if (ret) {
+		DRM_ERROR("failed to init ttm %d\n", ret);
+		goto err_ttm;
+	}
+
+	/* get display info */
+	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
+		     num_scanouts, &num_scanouts);
+	vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
+				    VIRTIO_GPU_MAX_SCANOUTS);
+	if (!vgdev->num_scanouts) {
+		DRM_ERROR("num_scanouts is zero\n");
+		ret = -EINVAL;
+		goto err_scanouts;
+	}
+	DRM_INFO("number of scanouts: %d\n", num_scanouts);
+
+	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
+		     num_capsets, &num_capsets);
+	DRM_INFO("number of cap sets: %d\n", num_capsets);
+
+	ret = virtio_gpu_modeset_init(vgdev);
+	if (ret)
+		goto err_modeset;
+
+	virtio_device_ready(vgdev->vdev);
+	vgdev->vqs_ready = true;
+
+	if (num_capsets)
+		virtio_gpu_get_capsets(vgdev, num_capsets);
+	virtio_gpu_cmd_get_display_info(vgdev);
+	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
+			   5 * HZ);
+	if (virtio_gpu_fbdev)
+		virtio_gpu_fbdev_init(vgdev);
+
+	return 0;
+
+err_modeset:
+err_scanouts:
+	virtio_gpu_ttm_fini(vgdev);
+err_ttm:
+	virtio_gpu_free_vbufs(vgdev);
+err_vbufs:
+	vgdev->vdev->config->del_vqs(vgdev->vdev);
+err_vqs:
+	kfree(vgdev);
+	return ret;
+}
+
+static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
+{
+	struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
+
+	list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
+		kfree(cache_ent->caps_cache);
+		kfree(cache_ent);
+	}
+}
+
+int virtio_gpu_driver_unload(struct drm_device *dev)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+
+	vgdev->vqs_ready = false;
+	flush_work(&vgdev->ctrlq.dequeue_work);
+	flush_work(&vgdev->cursorq.dequeue_work);
+	flush_work(&vgdev->config_changed_work);
+	vgdev->vdev->config->del_vqs(vgdev->vdev);
+
+	virtio_gpu_modeset_fini(vgdev);
+	virtio_gpu_ttm_fini(vgdev);
+	virtio_gpu_free_vbufs(vgdev);
+	virtio_gpu_cleanup_cap_cache(vgdev);
+	kfree(vgdev->capsets);
+	kfree(vgdev);
+	return 0;
+}
+
+int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_fpriv *vfpriv;
+	uint32_t id;
+	char dbgname[64], tmpname[TASK_COMM_LEN];
+
+	/* can't create contexts without 3d renderer */
+	if (!vgdev->has_virgl_3d)
+		return 0;
+
+	get_task_comm(tmpname, current);
+	snprintf(dbgname, sizeof(dbgname), "%s", tmpname);
+	dbgname[63] = 0;
+	/* allocate a virt GPU context for this opener */
+	vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
+	if (!vfpriv)
+		return -ENOMEM;
+
+	virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname, &id);
+
+	vfpriv->ctx_id = id;
+	file->driver_priv = vfpriv;
+	return 0;
+}
+
+void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_fpriv *vfpriv;
+
+	if (!vgdev->has_virgl_3d)
+		return;
+
+	vfpriv = file->driver_priv;
+
+	virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
+	kfree(vfpriv);
+	file->driver_priv = NULL;
+}