virtio: Add virtio-camera

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>

hw/virtio/Kconfig

@@ -30,6 +30,11 @@ config VIRTIO_BALLOON
     default y
     depends on VIRTIO
 
+config VIRTIO_CAMERA
+    bool
+    default y
+    depends on VIRTIO
+
 config VIRTIO_CRYPTO
     bool
     default y

hw/virtio/meson.build

@@ -30,6 +30,11 @@ virtio_ss.add(when: 'CONFIG_VIRTIO_MEM', if_true: files('virtio-mem.c'))
 virtio_ss.add(when: 'CONFIG_VHOST_USER_I2C', if_true: files('vhost-user-i2c.c'))
 virtio_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true: files('vhost-user-rng.c'))
 
+if libv4l2.found()
+  virtio_ss.add(declare_dependency(dependencies: [libv4l2]))
+  virtio_ss.add(when: 'CONFIG_VIRTIO_CAMERA', if_true: files('virtio-camera.c'))
+endif
+
 virtio_pci_ss = ss.source_set()
 virtio_pci_ss.add(when: 'CONFIG_VHOST_VSOCK', if_true: files('vhost-vsock-pci.c'))
 virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_VSOCK', if_true: files('vhost-user-vsock-pci.c'))

hw/virtio/virtio.c

@@ -171,7 +171,8 @@ const char *virtio_device_names[] = {
     [VIRTIO_ID_PARAM_SERV] = "virtio-param-serv",
     [VIRTIO_ID_AUDIO_POLICY] = "virtio-audio-pol",
     [VIRTIO_ID_BT] = "virtio-bluetooth",
-    [VIRTIO_ID_GPIO] = "virtio-gpio"
+    [VIRTIO_ID_GPIO] = "virtio-gpio",
+    [VIRTIO_ID_CAMERA] = "virtio-camera",
 };
 
 static const char *virtio_id_to_name(uint16_t device_id)

include/hw/virtio/virtio-camera.h

+/*
+ * Virtio Camera Device
+ *
+ * Copyright © 2022 Collabora, Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_VIRTIO_CAMERA_H
+#define QEMU_VIRTIO_CAMERA_H
+
+#include "qemu/queue.h"
+#include "qemu/uuid.h"
+#include "hw/virtio/virtio.h"
+#include "qom/object.h"
+
+#include "standard-headers/linux/virtio_camera.h"
+
+#define TYPE_VIRTIO_CAMERA "virtio-camera-device"
+OBJECT_DECLARE_SIMPLE_TYPE(VirtIOCamera, VIRTIO_CAMERA)
+
+#define VIRTIO_CAMERA_GET_PARENT_CLASS(obj) \
+        OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_CAMERA)
+
+#define VIRTIO_CAMERA_NUM_V4L2_BUFFERS  3
+
+struct virtio_camera_v4l2 {
+    void *buffer_data[VIRTIO_CAMERA_NUM_V4L2_BUFFERS];
+    size_t buffer_size[VIRTIO_CAMERA_NUM_V4L2_BUFFERS];
+    unsigned int queue_buffer_index;
+    char *dev_path;
+    int fd;
+};
+
+struct virtio_camera_mem_buffer {
+    QTAILQ_ENTRY(virtio_camera_mem_buffer) node;
+    QTAILQ_ENTRY(virtio_camera_mem_buffer) capture_node;
+    QemuUUID uuid;
+    VirtQueueElement *capture_elem;
+    unsigned int num_entries;
+    struct iovec iov[];
+};
+
+struct VirtIOCamera {
+    VirtIODevice parent_obj;
+    VirtQueue *ctrl_vq;
+    struct virtio_camera_v4l2 v4l2;
+    struct virtio_camera_config config;
+    QTAILQ_HEAD(, virtio_camera_mem_buffer) buflist;
+    QTAILQ_HEAD(, virtio_camera_mem_buffer) capturelist;
+    uint64_t mem_buf_uuid;
+    bool streaming;
+};
+
+#endif

include/standard-headers/linux/virtio_camera.h

+/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
+/*
+ * Virtio Camera Device
+ *
+ * Copyright © 2022 Collabora, Ltd.
+ */
+
+#ifndef _LINUX_VIRTIO_CAMERA_H
+#define _LINUX_VIRTIO_CAMERA_H
+
+#include "standard-headers/linux/types.h"
+
+enum virtio_camera_ctrl_type {
+	VIRTIO_CAMERA_CMD_GET_FORMAT = 0x1,
+	VIRTIO_CAMERA_CMD_SET_FORMAT,
+	VIRTIO_CAMERA_CMD_TRY_FORMAT,
+	VIRTIO_CAMERA_CMD_ENUM_FORMAT,
+	VIRTIO_CAMERA_CMD_ENUM_SIZE,
+	VIRTIO_CAMERA_CMD_CREATE_BUFFER,
+	VIRTIO_CAMERA_CMD_DESTROY_BUFFER,
+	VIRTIO_CAMERA_CMD_ENQUEUE_BUFFER,
+	VIRTIO_CAMERA_CMD_STREAM_ON,
+	VIRTIO_CAMERA_CMD_STREAM_OFF,
+
+	VIRTIO_CAMERA_CMD_RESP_OK_NODATA = 0x100,
+
+	VIRTIO_CAMERA_CMD_RESP_ERR_UNSPEC = 0x200,
+	VIRTIO_CAMERA_CMD_RESP_ERR_BUSY = 0x201,
+	VIRTIO_CAMERA_CMD_RESP_ERR_OUT_OF_MEMORY = 0x202,
+};
+
+struct virtio_camera_config {
+	uint8_t name[256];
+};
+
+struct virtio_camera_mem_entry {
+	uint64_t addr;
+	uint32_t length;
+};
+
+struct virtio_camera_ctrl_hdr {
+	uint32_t cmd;
+	uint32_t index;
+};
+
+struct virtio_camera_format_size {
+	union {
+		uint32_t min_width;
+		uint32_t width;
+	};
+	uint32_t max_width;
+	uint32_t step_width;
+
+	union {
+		uint32_t min_height;
+		uint32_t height;
+	};
+	uint32_t max_height;
+	uint32_t step_height;
+	uint32_t stride;
+	uint32_t sizeimage;
+};
+
+struct virtio_camera_req_format {
+	uint32_t pixelformat;
+	struct virtio_camera_format_size size;
+};
+
+struct virtio_camera_req_buffer {
+	uint32_t num_entries;
+	uint8_t uuid[16];
+};
+
+struct virtio_camera_op_ctrl_req {
+	struct virtio_camera_ctrl_hdr header;
+
+	union {
+		struct virtio_camera_req_format format;
+		struct virtio_camera_req_buffer buffer;
+		uint64_t padding[3];
+	} u;
+};
+
+#endif

include/standard-headers/linux/virtio_ids.h

@@ -68,6 +68,7 @@
 #define VIRTIO_ID_AUDIO_POLICY		39 /* virtio audio policy */
 #define VIRTIO_ID_BT			40 /* virtio bluetooth */
 #define VIRTIO_ID_GPIO			41 /* virtio gpio */
+#define VIRTIO_ID_CAMERA		42 /* virtio camera */
 
 /*
  * Virtio Transitional IDs

meson.build

@@ -2782,6 +2782,9 @@ config_host_data.set('CONFIG_CAPSTONE', capstone.found())
 config_host_data.set('CONFIG_FDT', fdt.found())
 config_host_data.set('CONFIG_SLIRP', slirp.found())
 
+libv4l2 = dependency('libv4l2', required: true, method: 'pkg-config',
+                     kwargs: static_kwargs)
+
 #####################
 # Generated sources #
 #####################
@@ -3981,6 +3984,7 @@ summary_info += {'capstone':          capstone}
 summary_info += {'libpmem support':   libpmem}
 summary_info += {'libdaxctl support': libdaxctl}
 summary_info += {'libudev':           libudev}
+summary_info += {'libv4l2 support':   libv4l2}
 # Dummy dependency, keep .found()
 summary_info += {'FUSE lseek':        fuse_lseek.found()}
 summary_info += {'selinux':           selinux}