1 files changed, 346 insertions, 0 deletions

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
new file mode 100644
index 000000000..27b7f14da
--- /dev/null
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -0,0 +1,346 @@
+/*
+ * 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 <linux/virtio_ring.h>
+
+#include <drm/drm_file.h>
+#include <drm/drm_managed.h>
+
+#include "virtgpu_drv.h"
+
+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_le(vgdev->vdev, struct virtio_gpu_config,
+			events_read, &events_read);
+	if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
+		if (vgdev->has_edid)
+			virtio_gpu_cmd_get_edids(vgdev);
+		virtio_gpu_cmd_get_display_info(vgdev);
+		virtio_gpu_notify(vgdev);
+		drm_helper_hpd_irq_event(vgdev->ddev);
+		events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
+	}
+	virtio_cwrite_le(vgdev->vdev, struct virtio_gpu_config,
+			 events_clear, &events_clear);
+}
+
+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;
+	bool invalid_capset_id = false;
+	struct drm_device *drm = vgdev->ddev;
+
+	vgdev->capsets = drmm_kcalloc(drm, 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);
+		virtio_gpu_notify(vgdev);
+		ret = wait_event_timeout(vgdev->resp_wq,
+					 vgdev->capsets[i].id > 0, 5 * HZ);
+		/*
+		 * Capability ids are defined in the virtio-gpu spec and are
+		 * between 1 to 63, inclusive.
+		 */
+		if (!vgdev->capsets[i].id ||
+		    vgdev->capsets[i].id > MAX_CAPSET_ID)
+			invalid_capset_id = true;
+
+		if (ret == 0)
+			DRM_ERROR("timed out waiting for cap set %d\n", i);
+		else if (invalid_capset_id)
+			DRM_ERROR("invalid capset id %u", vgdev->capsets[i].id);
+
+		if (ret == 0 || invalid_capset_id) {
+			spin_lock(&vgdev->display_info_lock);
+			drmm_kfree(drm, vgdev->capsets);
+			vgdev->capsets = NULL;
+			spin_unlock(&vgdev->display_info_lock);
+			return;
+		}
+
+		vgdev->capset_id_mask |= 1 << vgdev->capsets[i].id;
+		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_init(struct virtio_device *vdev, struct drm_device *dev)
+{
+	static vq_callback_t *callbacks[] = {
+		virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
+	};
+	static const char * const names[] = { "control", "cursor" };
+
+	struct virtio_gpu_device *vgdev;
+	/* this will expand later */
+	struct virtqueue *vqs[2];
+	u32 num_scanouts, num_capsets;
+	int ret = 0;
+
+	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
+		return -ENODEV;
+
+	vgdev = drmm_kzalloc(dev, sizeof(struct virtio_gpu_device), GFP_KERNEL);
+	if (!vgdev)
+		return -ENOMEM;
+
+	vgdev->ddev = dev;
+	dev->dev_private = vgdev;
+	vgdev->vdev = vdev;
+
+	spin_lock_init(&vgdev->display_info_lock);
+	spin_lock_init(&vgdev->resource_export_lock);
+	spin_lock_init(&vgdev->host_visible_lock);
+	ida_init(&vgdev->ctx_id_ida);
+	ida_init(&vgdev->resource_ida);
+	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);
+
+	vgdev->fence_drv.context = dma_fence_context_alloc(1);
+	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);
+
+	INIT_WORK(&vgdev->obj_free_work,
+		  virtio_gpu_array_put_free_work);
+	INIT_LIST_HEAD(&vgdev->obj_free_list);
+	spin_lock_init(&vgdev->obj_free_lock);
+
+#ifdef __LITTLE_ENDIAN
+	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
+		vgdev->has_virgl_3d = true;
+#endif
+	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
+		vgdev->has_edid = true;
+	}
+	if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
+		vgdev->has_indirect = true;
+	}
+	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) {
+		vgdev->has_resource_assign_uuid = true;
+	}
+	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_BLOB)) {
+		vgdev->has_resource_blob = true;
+	}
+	if (virtio_get_shm_region(vgdev->vdev, &vgdev->host_visible_region,
+				  VIRTIO_GPU_SHM_ID_HOST_VISIBLE)) {
+		if (!devm_request_mem_region(&vgdev->vdev->dev,
+					     vgdev->host_visible_region.addr,
+					     vgdev->host_visible_region.len,
+					     dev_name(&vgdev->vdev->dev))) {
+			DRM_ERROR("Could not reserve host visible region\n");
+			ret = -EBUSY;
+			goto err_vqs;
+		}
+
+		DRM_INFO("Host memory window: 0x%lx +0x%lx\n",
+			 (unsigned long)vgdev->host_visible_region.addr,
+			 (unsigned long)vgdev->host_visible_region.len);
+		vgdev->has_host_visible = true;
+		drm_mm_init(&vgdev->host_visible_mm,
+			    (unsigned long)vgdev->host_visible_region.addr,
+			    (unsigned long)vgdev->host_visible_region.len);
+	}
+	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_CONTEXT_INIT)) {
+		vgdev->has_context_init = true;
+	}
+
+	DRM_INFO("features: %cvirgl %cedid %cresource_blob %chost_visible",
+		 vgdev->has_virgl_3d    ? '+' : '-',
+		 vgdev->has_edid        ? '+' : '-',
+		 vgdev->has_resource_blob ? '+' : '-',
+		 vgdev->has_host_visible ? '+' : '-');
+
+	DRM_INFO("features: %ccontext_init\n",
+		 vgdev->has_context_init ? '+' : '-');
+
+	ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
+	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;
+	}
+
+	/* get display info */
+	virtio_cread_le(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_le(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) {
+		DRM_ERROR("modeset init failed\n");
+		goto err_scanouts;
+	}
+
+	virtio_device_ready(vgdev->vdev);
+
+	if (num_capsets)
+		virtio_gpu_get_capsets(vgdev, num_capsets);
+	if (vgdev->has_edid)
+		virtio_gpu_cmd_get_edids(vgdev);
+	virtio_gpu_cmd_get_display_info(vgdev);
+	virtio_gpu_notify(vgdev);
+	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
+			   5 * HZ);
+	return 0;
+
+err_scanouts:
+	virtio_gpu_free_vbufs(vgdev);
+err_vbufs:
+	vgdev->vdev->config->del_vqs(vgdev->vdev);
+err_vqs:
+	dev->dev_private = NULL;
+	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);
+	}
+}
+
+void virtio_gpu_deinit(struct drm_device *dev)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+
+	flush_work(&vgdev->obj_free_work);
+	flush_work(&vgdev->ctrlq.dequeue_work);
+	flush_work(&vgdev->cursorq.dequeue_work);
+	flush_work(&vgdev->config_changed_work);
+	virtio_reset_device(vgdev->vdev);
+	vgdev->vdev->config->del_vqs(vgdev->vdev);
+}
+
+void virtio_gpu_release(struct drm_device *dev)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+
+	if (!vgdev)
+		return;
+
+	virtio_gpu_modeset_fini(vgdev);
+	virtio_gpu_free_vbufs(vgdev);
+	virtio_gpu_cleanup_cap_cache(vgdev);
+
+	if (vgdev->has_host_visible)
+		drm_mm_takedown(&vgdev->host_visible_mm);
+}
+
+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;
+	int handle;
+
+	/* can't create contexts without 3d renderer */
+	if (!vgdev->has_virgl_3d)
+		return 0;
+
+	/* allocate a virt GPU context for this opener */
+	vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
+	if (!vfpriv)
+		return -ENOMEM;
+
+	mutex_init(&vfpriv->context_lock);
+
+	handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
+	if (handle < 0) {
+		kfree(vfpriv);
+		return handle;
+	}
+
+	vfpriv->ctx_id = handle + 1;
+	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 = file->driver_priv;
+
+	if (!vgdev->has_virgl_3d)
+		return;
+
+	if (vfpriv->context_created) {
+		virtio_gpu_cmd_context_destroy(vgdev, vfpriv->ctx_id);
+		virtio_gpu_notify(vgdev);
+	}
+
+	ida_free(&vgdev->ctx_id_ida, vfpriv->ctx_id - 1);
+	mutex_destroy(&vfpriv->context_lock);
+	kfree(vfpriv);
+	file->driver_priv = NULL;
+}