virtualization: Add virtio-video driver as external module.

This driver should conform WIP spec v3 [1] with some updates for spec v4
[2], and, some unspecified features such as VIRTIO_VIDEO_DEVICE_CAMERA.

Imported from internal OpenSynergy's revision:

  bcc33b6b9e0156b381a70c54d2df02c57b63d270

Kernel was configured with necessary features for this driver:

  enable MEDIA_SUPPORT
  disable MEDIA_SUBDRV_AUTOSELECT
  enable MEDIA_PLATFORM_SUPPORT
  enable VIDEO_VIRTIO

Keep driver as an external module to simplify future updates.

[1]: https://lists.oasis-open.org/archives/virtio-dev/202002/msg00002.html
[2]: https://lists.oasis-open.org/archives/virtio-dev/202006/msg00072.html

Bug-AGL: SPEC-4148
Change-Id: Iea339194b22443f67b3e2ffddca84118357a2f15
Signed-off-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>

1 files changed, 246 insertions, 0 deletions

diff --git a/meta-egvirt/recipes-kernel/kernel-module-virtio-video/files/virtio_video_driver.c b/meta-egvirt/recipes-kernel/kernel-module-virtio-video/files/virtio_video_driver.c
new file mode 100644
index 00000000..734c5b73
--- /dev/null
+++ b/meta-egvirt/recipes-kernel/kernel-module-virtio-video/files/virtio_video_driver.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Driver for virtio video device.
+ *
+ * Copyright 2020 OpenSynergy GmbH.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/module.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,10,0)
+#include <linux/dma-map-ops.h>
+#else
+#include <linux/dma-mapping.h>
+#endif
+
+#include "virtio_video.h"
+
+static unsigned int debug;
+module_param(debug, uint, 0644);
+
+static unsigned int use_dma_mem;
+module_param(use_dma_mem, uint, 0644);
+MODULE_PARM_DESC(use_dma_mem, "Try to allocate buffers from the DMA zone");
+
+static int vid_nr_dec = -1;
+module_param(vid_nr_dec, int, 0644);
+MODULE_PARM_DESC(vid_nr_dec, "videoN start number, -1 is autodetect");
+
+static int vid_nr_enc = -1;
+module_param(vid_nr_enc, int, 0644);
+MODULE_PARM_DESC(vid_nr_enc, "videoN start number, -1 is autodetect");
+
+static int vid_nr_cam = -1;
+module_param(vid_nr_cam, int, 0644);
+MODULE_PARM_DESC(vid_nr_cam, "videoN start number, -1 is autodetect");
+
+static bool mplane_cam = true;
+module_param(mplane_cam, bool, 0644);
+MODULE_PARM_DESC(mplane_cam,
+	"1 (default) - multiplanar camera, 0 - single planar camera");
+
+static int virtio_video_probe(struct virtio_device *vdev)
+{
+	int ret;
+	struct virtio_video_device *vvd;
+	struct virtqueue *vqs[2];
+	struct device *dev = &vdev->dev;
+	struct device *pdev = dev->parent;
+
+	static const char * const names[] = { "commandq", "eventq" };
+	static vq_callback_t *callbacks[] = {
+		virtio_video_cmd_cb,
+		virtio_video_event_cb
+	};
+
+	if (!virtio_has_feature(vdev, VIRTIO_VIDEO_F_RESOURCE_GUEST_PAGES)) {
+		dev_err(dev, "device must support guest allocated buffers\n");
+		return -ENODEV;
+	}
+
+	vvd = devm_kzalloc(dev, sizeof(*vvd), GFP_KERNEL);
+	if (!vvd)
+		return -ENOMEM;
+
+	vvd->is_m2m_dev = true;
+
+	switch (vdev->id.device) {
+	case VIRTIO_ID_VIDEO_CAM:
+		vvd->is_m2m_dev = false;
+		vvd->vid_dev_nr = vid_nr_cam;
+		vvd->is_mplane_cam = mplane_cam;
+		vvd->type = VIRTIO_VIDEO_DEVICE_CAMERA;
+		break;
+	case VIRTIO_ID_VIDEO_ENC:
+		vvd->vid_dev_nr = vid_nr_enc;
+		vvd->type = VIRTIO_VIDEO_DEVICE_ENCODER;
+		break;
+	case VIRTIO_ID_VIDEO_DEC:
+	default:
+		vvd->vid_dev_nr = vid_nr_dec;
+		vvd->type = VIRTIO_VIDEO_DEVICE_DECODER;
+		break;
+	}
+
+	vvd->vdev = vdev;
+	vvd->debug = debug;
+	vvd->use_dma_mem = use_dma_mem;
+	vdev->priv = vvd;
+
+	spin_lock_init(&vvd->pending_buf_list_lock);
+	spin_lock_init(&vvd->resource_idr_lock);
+	idr_init(&vvd->resource_idr);
+	spin_lock_init(&vvd->stream_idr_lock);
+	idr_init(&vvd->stream_idr);
+
+	init_waitqueue_head(&vvd->wq);
+
+	if (virtio_has_feature(vdev, VIRTIO_VIDEO_F_RESOURCE_NON_CONTIG))
+		vvd->supp_non_contig = true;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0)
+	vvd->has_iommu = !virtio_has_dma_quirk(vdev);
+#else
+	vvd->has_iommu = !virtio_has_iommu_quirk(vdev);
+#endif
+
+	if (!dev->dma_ops)
+		set_dma_ops(dev, pdev->dma_ops);
+
+	/*
+	 * Set it to coherent_dma_mask by default if the architecture
+	 * code has not set it.
+	 */
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+
+	dma_set_mask(dev, *pdev->dma_mask);
+
+	dev_set_name(dev, "%s.%i", DRIVER_NAME, vdev->index);
+	ret = v4l2_device_register(dev, &vvd->v4l2_dev);
+	if (ret)
+		goto err_v4l2_reg;
+
+	spin_lock_init(&vvd->commandq.qlock);
+	init_waitqueue_head(&vvd->commandq.reclaim_queue);
+
+	INIT_WORK(&vvd->eventq.work, virtio_video_process_events);
+
+	INIT_LIST_HEAD(&vvd->pending_vbuf_list);
+
+	ret = virtio_find_vqs(vdev, 2, vqs, callbacks, names, NULL);
+	if (ret) {
+		v4l2_err(&vvd->v4l2_dev, "failed to find virt queues\n");
+		goto err_vqs;
+	}
+
+	vvd->commandq.vq = vqs[0];
+	vvd->eventq.vq = vqs[1];
+
+	ret = virtio_video_alloc_vbufs(vvd);
+	if (ret) {
+		v4l2_err(&vvd->v4l2_dev, "failed to alloc vbufs\n");
+		goto err_vbufs;
+	}
+
+	virtio_cread(vdev, struct virtio_video_config, max_caps_length,
+		     &vvd->max_caps_len);
+	if (!vvd->max_caps_len) {
+		v4l2_err(&vvd->v4l2_dev, "max_caps_len is zero\n");
+		ret = -EINVAL;
+		goto err_config;
+	}
+
+	virtio_cread(vdev, struct virtio_video_config, max_resp_length,
+		     &vvd->max_resp_len);
+	if (!vvd->max_resp_len) {
+		v4l2_err(&vvd->v4l2_dev, "max_resp_len is zero\n");
+		ret = -EINVAL;
+		goto err_config;
+	}
+
+	ret = virtio_video_alloc_events(vvd);
+	if (ret)
+		goto err_events;
+
+	virtio_device_ready(vdev);
+	vvd->commandq.ready = true;
+	vvd->eventq.ready = true;
+
+	ret = virtio_video_device_init(vvd);
+	if (ret) {
+		v4l2_err(&vvd->v4l2_dev,
+			 "failed to init virtio video\n");
+		goto err_init;
+	}
+
+	return 0;
+
+err_init:
+err_events:
+err_config:
+	virtio_video_free_vbufs(vvd);
+err_vbufs:
+	vdev->config->del_vqs(vdev);
+err_vqs:
+	v4l2_device_unregister(&vvd->v4l2_dev);
+err_v4l2_reg:
+	devm_kfree(&vdev->dev, vvd);
+
+	return ret;
+}
+
+static void virtio_video_remove(struct virtio_device *vdev)
+{
+	struct virtio_video_device *vvd = vdev->priv;
+
+	virtio_video_device_deinit(vvd);
+	virtio_video_free_vbufs(vvd);
+	vdev->config->del_vqs(vdev);
+	v4l2_device_unregister(&vvd->v4l2_dev);
+	devm_kfree(&vdev->dev, vvd);
+}
+
+static struct virtio_device_id id_table[] = {
+	{ VIRTIO_ID_VIDEO_DEC, VIRTIO_DEV_ANY_ID },
+	{ VIRTIO_ID_VIDEO_ENC, VIRTIO_DEV_ANY_ID },
+	{ VIRTIO_ID_VIDEO_CAM, VIRTIO_DEV_ANY_ID },
+	{ 0 },
+};
+
+static unsigned int features[] = {
+	VIRTIO_VIDEO_F_RESOURCE_GUEST_PAGES,
+	VIRTIO_VIDEO_F_RESOURCE_NON_CONTIG,
+};
+
+static struct virtio_driver virtio_video_driver = {
+	.feature_table = features,
+	.feature_table_size = ARRAY_SIZE(features),
+	.driver.name = DRIVER_NAME,
+	.driver.owner = THIS_MODULE,
+	.id_table = id_table,
+	.probe = virtio_video_probe,
+	.remove = virtio_video_remove,
+};
+
+module_virtio_driver(virtio_video_driver);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("virtio video driver");
+MODULE_AUTHOR("Dmitry Sepp <dmitry.sepp@opensynergy.com>");
+MODULE_AUTHOR("Kiran Pawar <kiran.pawar@opensynergy.com>");
+MODULE_AUTHOR("Nikolay Martyanov <nikolay.martyanov@opensynergy.com>");
+MODULE_AUTHOR("Samiullah Khawaja <samiullah.khawaja@opensynergy.com>");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");