Add multiple-device support virtio-loopback-adapter

Updates [v1]:
- The adapter supports multiple vhost-user devices running in
  parallel.
- Redesign the devices interfaces. Unified their common functionality
  and add it into vhost-user-loopback lib. This eases the addition of
  new vhost-user devices and makes the virtio-loopback adapter more
  device agnostic.

Bug-AGL: SPEC-4834
Change-Id: I9aff91dce0207ccdd8c2d1c5d0769a13b4e9ae04
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/vhost_user_gpio.h b/include/vhost_user_gpio.h
new file mode 100644
index 0000000..4d77e0a
--- /dev/null
+++ b/include/vhost_user_gpio.h
@@ -0,0 +1,37 @@
+/*
+ * Based on virtio-gpio.h of QEMU project
+ *
+ * Copyright (c) 2023-2024 Virtual Open Systems SAS.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+
+#ifndef VHOST_USER_GPIO
+#define VHOST_USER_GPIO
+
+#include "vhost_loopback.h"
+#include "vhost_user_loopback.h"
+#include "virtio_loopback.h"
+
+#define VIRTIO_GPIO_F_IRQ 0
+
+struct virtio_gpio_config {
+    uint16_t ngpio;
+    uint8_t padding[2];
+    uint32_t gpio_names_size;
+};
+
+struct VHostUserGPIO {
+    VirtIODevice *parent;
+    struct virtio_gpio_config config;
+    struct vhost_virtqueue *vhost_vqs;
+    struct vhost_dev *vhost_dev;
+    uint16_t num_queues;
+    uint32_t queue_size;
+};
+
+void vu_gpio_device_realize(struct adapter_dev *adev);
+
+#endif /* VHOST_USER_GPIO */